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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdlib.h>
#include "v8.h"
#include "accessors.h"
#include "api.h"
#include "arguments.h"
#include "codegen.h"
#include "compilation-cache.h"
#include "compiler.h"
#include "cpu.h"
#include "dateparser-inl.h"
#include "debug.h"
#include "deoptimizer.h"
#include "execution.h"
#include "global-handles.h"
#include "jsregexp.h"
#include "liveedit.h"
#include "liveobjectlist-inl.h"
#include "parser.h"
#include "platform.h"
#include "runtime.h"
#include "runtime-profiler.h"
#include "scopeinfo.h"
#include "smart-pointer.h"
#include "stub-cache.h"
#include "v8threads.h"
#include "string-search.h"
namespace v8 {
namespace internal {
#define RUNTIME_ASSERT(value) \
if (!(value)) return isolate->ThrowIllegalOperation();
// Cast the given object to a value of the specified type and store
// it in a variable with the given name. If the object is not of the
// expected type call IllegalOperation and return.
#define CONVERT_CHECKED(Type, name, obj) \
RUNTIME_ASSERT(obj->Is##Type()); \
Type* name = Type::cast(obj);
#define CONVERT_ARG_CHECKED(Type, name, index) \
RUNTIME_ASSERT(args[index]->Is##Type()); \
Handle<Type> name = args.at<Type>(index);
// Cast the given object to a boolean and store it in a variable with
// the given name. If the object is not a boolean call IllegalOperation
// and return.
#define CONVERT_BOOLEAN_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsBoolean()); \
bool name = (obj)->IsTrue();
// Cast the given object to a Smi and store its value in an int variable
// with the given name. If the object is not a Smi call IllegalOperation
// and return.
#define CONVERT_SMI_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsSmi()); \
int name = Smi::cast(obj)->value();
// Cast the given object to a double and store it in a variable with
// the given name. If the object is not a number (as opposed to
// the number not-a-number) call IllegalOperation and return.
#define CONVERT_DOUBLE_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsNumber()); \
double name = (obj)->Number();
// Call the specified converter on the object *comand store the result in
// a variable of the specified type with the given name. If the
// object is not a Number call IllegalOperation and return.
#define CONVERT_NUMBER_CHECKED(type, name, Type, obj) \
RUNTIME_ASSERT(obj->IsNumber()); \
type name = NumberTo##Type(obj);
MUST_USE_RESULT static MaybeObject* DeepCopyBoilerplate(Isolate* isolate,
JSObject* boilerplate) {
StackLimitCheck check(isolate);
if (check.HasOverflowed()) return isolate->StackOverflow();
Heap* heap = isolate->heap();
Object* result;
{ MaybeObject* maybe_result = heap->CopyJSObject(boilerplate);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
JSObject* copy = JSObject::cast(result);
// Deep copy local properties.
if (copy->HasFastProperties()) {
FixedArray* properties = copy->properties();
for (int i = 0; i < properties->length(); i++) {
Object* value = properties->get(i);
if (value->IsJSObject()) {
JSObject* js_object = JSObject::cast(value);
{ MaybeObject* maybe_result = DeepCopyBoilerplate(isolate, js_object);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
properties->set(i, result);
}
}
int nof = copy->map()->inobject_properties();
for (int i = 0; i < nof; i++) {
Object* value = copy->InObjectPropertyAt(i);
if (value->IsJSObject()) {
JSObject* js_object = JSObject::cast(value);
{ MaybeObject* maybe_result = DeepCopyBoilerplate(isolate, js_object);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
copy->InObjectPropertyAtPut(i, result);
}
}
} else {
{ MaybeObject* maybe_result =
heap->AllocateFixedArray(copy->NumberOfLocalProperties(NONE));
if (!maybe_result->ToObject(&result)) return maybe_result;
}
FixedArray* names = FixedArray::cast(result);
copy->GetLocalPropertyNames(names, 0);
for (int i = 0; i < names->length(); i++) {
ASSERT(names->get(i)->IsString());
String* key_string = String::cast(names->get(i));
PropertyAttributes attributes =
copy->GetLocalPropertyAttribute(key_string);
// Only deep copy fields from the object literal expression.
// In particular, don't try to copy the length attribute of
// an array.
if (attributes != NONE) continue;
Object* value =
copy->GetProperty(key_string, &attributes)->ToObjectUnchecked();
if (value->IsJSObject()) {
JSObject* js_object = JSObject::cast(value);
{ MaybeObject* maybe_result = DeepCopyBoilerplate(isolate, js_object);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
{ MaybeObject* maybe_result =
// Creating object copy for literals. No strict mode needed.
copy->SetProperty(key_string, result, NONE, kNonStrictMode);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
}
}
}
// Deep copy local elements.
// Pixel elements cannot be created using an object literal.
ASSERT(!copy->HasExternalArrayElements());
switch (copy->GetElementsKind()) {
case JSObject::FAST_ELEMENTS: {
FixedArray* elements = FixedArray::cast(copy->elements());
if (elements->map() == heap->fixed_cow_array_map()) {
isolate->counters()->cow_arrays_created_runtime()->Increment();
#ifdef DEBUG
for (int i = 0; i < elements->length(); i++) {
ASSERT(!elements->get(i)->IsJSObject());
}
#endif
} else {
for (int i = 0; i < elements->length(); i++) {
Object* value = elements->get(i);
if (value->IsJSObject()) {
JSObject* js_object = JSObject::cast(value);
{ MaybeObject* maybe_result = DeepCopyBoilerplate(isolate,
js_object);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
elements->set(i, result);
}
}
}
break;
}
case JSObject::DICTIONARY_ELEMENTS: {
NumberDictionary* element_dictionary = copy->element_dictionary();
int capacity = element_dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = element_dictionary->KeyAt(i);
if (element_dictionary->IsKey(k)) {
Object* value = element_dictionary->ValueAt(i);
if (value->IsJSObject()) {
JSObject* js_object = JSObject::cast(value);
{ MaybeObject* maybe_result = DeepCopyBoilerplate(isolate,
js_object);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
element_dictionary->ValueAtPut(i, result);
}
}
}
break;
}
default:
UNREACHABLE();
break;
}
return copy;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CloneLiteralBoilerplate) {
CONVERT_CHECKED(JSObject, boilerplate, args[0]);
return DeepCopyBoilerplate(isolate, boilerplate);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CloneShallowLiteralBoilerplate) {
CONVERT_CHECKED(JSObject, boilerplate, args[0]);
return isolate->heap()->CopyJSObject(boilerplate);
}
static Handle<Map> ComputeObjectLiteralMap(
Handle<Context> context,
Handle<FixedArray> constant_properties,
bool* is_result_from_cache) {
Isolate* isolate = context->GetIsolate();
int properties_length = constant_properties->length();
int number_of_properties = properties_length / 2;
if (FLAG_canonicalize_object_literal_maps) {
// Check that there are only symbols and array indices among keys.
int number_of_symbol_keys = 0;
for (int p = 0; p != properties_length; p += 2) {
Object* key = constant_properties->get(p);
uint32_t element_index = 0;
if (key->IsSymbol()) {
number_of_symbol_keys++;
} else if (key->ToArrayIndex(&element_index)) {
// An index key does not require space in the property backing store.
number_of_properties--;
} else {
// Bail out as a non-symbol non-index key makes caching impossible.
// ASSERT to make sure that the if condition after the loop is false.
ASSERT(number_of_symbol_keys != number_of_properties);
break;
}
}
// If we only have symbols and array indices among keys then we can
// use the map cache in the global context.
const int kMaxKeys = 10;
if ((number_of_symbol_keys == number_of_properties) &&
(number_of_symbol_keys < kMaxKeys)) {
// Create the fixed array with the key.
Handle<FixedArray> keys =
isolate->factory()->NewFixedArray(number_of_symbol_keys);
if (number_of_symbol_keys > 0) {
int index = 0;
for (int p = 0; p < properties_length; p += 2) {
Object* key = constant_properties->get(p);
if (key->IsSymbol()) {
keys->set(index++, key);
}
}
ASSERT(index == number_of_symbol_keys);
}
*is_result_from_cache = true;
return isolate->factory()->ObjectLiteralMapFromCache(context, keys);
}
}
*is_result_from_cache = false;
return isolate->factory()->CopyMap(
Handle<Map>(context->object_function()->initial_map()),
number_of_properties);
}
static Handle<Object> CreateLiteralBoilerplate(
Isolate* isolate,
Handle<FixedArray> literals,
Handle<FixedArray> constant_properties);
static Handle<Object> CreateObjectLiteralBoilerplate(
Isolate* isolate,
Handle<FixedArray> literals,
Handle<FixedArray> constant_properties,
bool should_have_fast_elements,
bool has_function_literal) {
// Get the global context from the literals array. This is the
// context in which the function was created and we use the object
// function from this context to create the object literal. We do
// not use the object function from the current global context
// because this might be the object function from another context
// which we should not have access to.
Handle<Context> context =
Handle<Context>(JSFunction::GlobalContextFromLiterals(*literals));
// In case we have function literals, we want the object to be in
// slow properties mode for now. We don't go in the map cache because
// maps with constant functions can't be shared if the functions are
// not the same (which is the common case).
bool is_result_from_cache = false;
Handle<Map> map = has_function_literal
? Handle<Map>(context->object_function()->initial_map())
: ComputeObjectLiteralMap(context,
constant_properties,
&is_result_from_cache);
Handle<JSObject> boilerplate = isolate->factory()->NewJSObjectFromMap(map);
// Normalize the elements of the boilerplate to save space if needed.
if (!should_have_fast_elements) NormalizeElements(boilerplate);
// Add the constant properties to the boilerplate.
int length = constant_properties->length();
bool should_transform =
!is_result_from_cache && boilerplate->HasFastProperties();
if (should_transform || has_function_literal) {
// Normalize the properties of object to avoid n^2 behavior
// when extending the object multiple properties. Indicate the number of
// properties to be added.
NormalizeProperties(boilerplate, KEEP_INOBJECT_PROPERTIES, length / 2);
}
for (int index = 0; index < length; index +=2) {
Handle<Object> key(constant_properties->get(index+0), isolate);
Handle<Object> value(constant_properties->get(index+1), isolate);
if (value->IsFixedArray()) {
// The value contains the constant_properties of a
// simple object or array literal.
Handle<FixedArray> array = Handle<FixedArray>::cast(value);
value = CreateLiteralBoilerplate(isolate, literals, array);
if (value.is_null()) return value;
}
Handle<Object> result;
uint32_t element_index = 0;
if (key->IsSymbol()) {
if (Handle<String>::cast(key)->AsArrayIndex(&element_index)) {
// Array index as string (uint32).
result = SetOwnElement(boilerplate,
element_index,
value,
kNonStrictMode);
} else {
Handle<String> name(String::cast(*key));
ASSERT(!name->AsArrayIndex(&element_index));
result = SetLocalPropertyIgnoreAttributes(boilerplate, name,
value, NONE);
}
} else if (key->ToArrayIndex(&element_index)) {
// Array index (uint32).
result = SetOwnElement(boilerplate,
element_index,
value,
kNonStrictMode);
} else {
// Non-uint32 number.
ASSERT(key->IsNumber());
double num = key->Number();
char arr[100];
Vector<char> buffer(arr, ARRAY_SIZE(arr));
const char* str = DoubleToCString(num, buffer);
Handle<String> name =
isolate->factory()->NewStringFromAscii(CStrVector(str));
result = SetLocalPropertyIgnoreAttributes(boilerplate, name,
value, NONE);
}
// If setting the property on the boilerplate throws an
// exception, the exception is converted to an empty handle in
// the handle based operations. In that case, we need to
// convert back to an exception.
if (result.is_null()) return result;
}
// Transform to fast properties if necessary. For object literals with
// containing function literals we defer this operation until after all
// computed properties have been assigned so that we can generate
// constant function properties.
if (should_transform && !has_function_literal) {
TransformToFastProperties(boilerplate,
boilerplate->map()->unused_property_fields());
}
return boilerplate;
}
static Handle<Object> CreateArrayLiteralBoilerplate(
Isolate* isolate,
Handle<FixedArray> literals,
Handle<FixedArray> elements) {
// Create the JSArray.
Handle<JSFunction> constructor(
JSFunction::GlobalContextFromLiterals(*literals)->array_function());
Handle<Object> object = isolate->factory()->NewJSObject(constructor);
const bool is_cow =
(elements->map() == isolate->heap()->fixed_cow_array_map());
Handle<FixedArray> copied_elements =
is_cow ? elements : isolate->factory()->CopyFixedArray(elements);
Handle<FixedArray> content = Handle<FixedArray>::cast(copied_elements);
if (is_cow) {
#ifdef DEBUG
// Copy-on-write arrays must be shallow (and simple).
for (int i = 0; i < content->length(); i++) {
ASSERT(!content->get(i)->IsFixedArray());
}
#endif
} else {
for (int i = 0; i < content->length(); i++) {
if (content->get(i)->IsFixedArray()) {
// The value contains the constant_properties of a
// simple object or array literal.
Handle<FixedArray> fa(FixedArray::cast(content->get(i)));
Handle<Object> result =
CreateLiteralBoilerplate(isolate, literals, fa);
if (result.is_null()) return result;
content->set(i, *result);
}
}
}
// Set the elements.
Handle<JSArray>::cast(object)->SetContent(*content);
return object;
}
static Handle<Object> CreateLiteralBoilerplate(
Isolate* isolate,
Handle<FixedArray> literals,
Handle<FixedArray> array) {
Handle<FixedArray> elements = CompileTimeValue::GetElements(array);
const bool kHasNoFunctionLiteral = false;
switch (CompileTimeValue::GetType(array)) {
case CompileTimeValue::OBJECT_LITERAL_FAST_ELEMENTS:
return CreateObjectLiteralBoilerplate(isolate,
literals,
elements,
true,
kHasNoFunctionLiteral);
case CompileTimeValue::OBJECT_LITERAL_SLOW_ELEMENTS:
return CreateObjectLiteralBoilerplate(isolate,
literals,
elements,
false,
kHasNoFunctionLiteral);
case CompileTimeValue::ARRAY_LITERAL:
return CreateArrayLiteralBoilerplate(isolate, literals, elements);
default:
UNREACHABLE();
return Handle<Object>::null();
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateArrayLiteralBoilerplate) {
// Takes a FixedArray of elements containing the literal elements of
// the array literal and produces JSArray with those elements.
// Additionally takes the literals array of the surrounding function
// which contains the context from which to get the Array function
// to use for creating the array literal.
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
Handle<Object> object =
CreateArrayLiteralBoilerplate(isolate, literals, elements);
if (object.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *object);
return *object;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateObjectLiteral) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, constant_properties, 2);
CONVERT_SMI_CHECKED(flags, args[3]);
bool should_have_fast_elements = (flags & ObjectLiteral::kFastElements) != 0;
bool has_function_literal = (flags & ObjectLiteral::kHasFunction) != 0;
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index), isolate);
if (*boilerplate == isolate->heap()->undefined_value()) {
boilerplate = CreateObjectLiteralBoilerplate(isolate,
literals,
constant_properties,
should_have_fast_elements,
has_function_literal);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return DeepCopyBoilerplate(isolate, JSObject::cast(*boilerplate));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateObjectLiteralShallow) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, constant_properties, 2);
CONVERT_SMI_CHECKED(flags, args[3]);
bool should_have_fast_elements = (flags & ObjectLiteral::kFastElements) != 0;
bool has_function_literal = (flags & ObjectLiteral::kHasFunction) != 0;
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index), isolate);
if (*boilerplate == isolate->heap()->undefined_value()) {
boilerplate = CreateObjectLiteralBoilerplate(isolate,
literals,
constant_properties,
should_have_fast_elements,
has_function_literal);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return isolate->heap()->CopyJSObject(JSObject::cast(*boilerplate));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateArrayLiteral) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index), isolate);
if (*boilerplate == isolate->heap()->undefined_value()) {
boilerplate = CreateArrayLiteralBoilerplate(isolate, literals, elements);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return DeepCopyBoilerplate(isolate, JSObject::cast(*boilerplate));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateArrayLiteralShallow) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index), isolate);
if (*boilerplate == isolate->heap()->undefined_value()) {
boilerplate = CreateArrayLiteralBoilerplate(isolate, literals, elements);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
if (JSObject::cast(*boilerplate)->elements()->map() ==
isolate->heap()->fixed_cow_array_map()) {
isolate->counters()->cow_arrays_created_runtime()->Increment();
}
return isolate->heap()->CopyJSObject(JSObject::cast(*boilerplate));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateCatchExtensionObject) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, key, args[0]);
Object* value = args[1];
// Create a catch context extension object.
JSFunction* constructor =
isolate->context()->global_context()->
context_extension_function();
Object* object;
{ MaybeObject* maybe_object = isolate->heap()->AllocateJSObject(constructor);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
// Assign the exception value to the catch variable and make sure
// that the catch variable is DontDelete.
{ MaybeObject* maybe_value =
// Passing non-strict per ECMA-262 5th Ed. 12.14. Catch, bullet #4.
JSObject::cast(object)->SetProperty(
key, value, DONT_DELETE, kNonStrictMode);
if (!maybe_value->ToObject(&value)) return maybe_value;
}
return object;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ClassOf) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Object* obj = args[0];
if (!obj->IsJSObject()) return isolate->heap()->null_value();
return JSObject::cast(obj)->class_name();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsInPrototypeChain) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
// See ECMA-262, section 15.3.5.3, page 88 (steps 5 - 8).
Object* O = args[0];
Object* V = args[1];
while (true) {
Object* prototype = V->GetPrototype();
if (prototype->IsNull()) return isolate->heap()->false_value();
if (O == prototype) return isolate->heap()->true_value();
V = prototype;
}
}
// Inserts an object as the hidden prototype of another object.
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetHiddenPrototype) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSObject, jsobject, args[0]);
CONVERT_CHECKED(JSObject, proto, args[1]);
// Sanity checks. The old prototype (that we are replacing) could
// theoretically be null, but if it is not null then check that we
// didn't already install a hidden prototype here.
RUNTIME_ASSERT(!jsobject->GetPrototype()->IsHeapObject() ||
!HeapObject::cast(jsobject->GetPrototype())->map()->is_hidden_prototype());
RUNTIME_ASSERT(!proto->map()->is_hidden_prototype());
// Allocate up front before we start altering state in case we get a GC.
Object* map_or_failure;
{ MaybeObject* maybe_map_or_failure = proto->map()->CopyDropTransitions();
if (!maybe_map_or_failure->ToObject(&map_or_failure)) {
return maybe_map_or_failure;
}
}
Map* new_proto_map = Map::cast(map_or_failure);
{ MaybeObject* maybe_map_or_failure = jsobject->map()->CopyDropTransitions();
if (!maybe_map_or_failure->ToObject(&map_or_failure)) {
return maybe_map_or_failure;
}
}
Map* new_map = Map::cast(map_or_failure);
// Set proto's prototype to be the old prototype of the object.
new_proto_map->set_prototype(jsobject->GetPrototype());
proto->set_map(new_proto_map);
new_proto_map->set_is_hidden_prototype();
// Set the object's prototype to proto.
new_map->set_prototype(proto);
jsobject->set_map(new_map);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsConstructCall) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
JavaScriptFrameIterator it(isolate);
return isolate->heap()->ToBoolean(it.frame()->IsConstructor());
}
// Recursively traverses hidden prototypes if property is not found
static void GetOwnPropertyImplementation(JSObject* obj,
String* name,
LookupResult* result) {
obj->LocalLookupRealNamedProperty(name, result);
if (!result->IsProperty()) {
Object* proto = obj->GetPrototype();
if (proto->IsJSObject() &&
JSObject::cast(proto)->map()->is_hidden_prototype())
GetOwnPropertyImplementation(JSObject::cast(proto),
name, result);
}
}
static bool CheckAccessException(LookupResult* result,
v8::AccessType access_type) {
if (result->type() == CALLBACKS) {
Object* callback = result->GetCallbackObject();
if (callback->IsAccessorInfo()) {
AccessorInfo* info = AccessorInfo::cast(callback);
bool can_access =
(access_type == v8::ACCESS_HAS &&
(info->all_can_read() || info->all_can_write())) ||
(access_type == v8::ACCESS_GET && info->all_can_read()) ||
(access_type == v8::ACCESS_SET && info->all_can_write());
return can_access;
}
}
return false;
}
static bool CheckAccess(JSObject* obj,
String* name,
LookupResult* result,
v8::AccessType access_type) {
ASSERT(result->IsProperty());
JSObject* holder = result->holder();
JSObject* current = obj;
Isolate* isolate = obj->GetIsolate();
while (true) {
if (current->IsAccessCheckNeeded() &&
!isolate->MayNamedAccess(current, name, access_type)) {
// Access check callback denied the access, but some properties
// can have a special permissions which override callbacks descision
// (currently see v8::AccessControl).
break;
}
if (current == holder) {
return true;
}
current = JSObject::cast(current->GetPrototype());
}
// API callbacks can have per callback access exceptions.
switch (result->type()) {
case CALLBACKS: {
if (CheckAccessException(result, access_type)) {
return true;
}
break;
}
case INTERCEPTOR: {
// If the object has an interceptor, try real named properties.
// Overwrite the result to fetch the correct property later.
holder->LookupRealNamedProperty(name, result);
if (result->IsProperty()) {
if (CheckAccessException(result, access_type)) {
return true;
}
}
break;
}
default:
break;
}
isolate->ReportFailedAccessCheck(current, access_type);
return false;
}
// TODO(1095): we should traverse hidden prototype hierachy as well.
static bool CheckElementAccess(JSObject* obj,
uint32_t index,
v8::AccessType access_type) {
if (obj->IsAccessCheckNeeded() &&
!obj->GetIsolate()->MayIndexedAccess(obj, index, access_type)) {
return false;
}
return true;
}
// Enumerator used as indices into the array returned from GetOwnProperty
enum PropertyDescriptorIndices {
IS_ACCESSOR_INDEX,
VALUE_INDEX,
GETTER_INDEX,
SETTER_INDEX,
WRITABLE_INDEX,
ENUMERABLE_INDEX,
CONFIGURABLE_INDEX,
DESCRIPTOR_SIZE
};
// Returns an array with the property description:
// if args[1] is not a property on args[0]
// returns undefined
// if args[1] is a data property on args[0]
// [false, value, Writeable, Enumerable, Configurable]
// if args[1] is an accessor on args[0]
// [true, GetFunction, SetFunction, Enumerable, Configurable]
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOwnProperty) {
ASSERT(args.length() == 2);
Heap* heap = isolate->heap();
HandleScope scope(isolate);
Handle<FixedArray> elms = isolate->factory()->NewFixedArray(DESCRIPTOR_SIZE);
Handle<JSArray> desc = isolate->factory()->NewJSArrayWithElements(elms);
LookupResult result;
CONVERT_ARG_CHECKED(JSObject, obj, 0);
CONVERT_ARG_CHECKED(String, name, 1);
// This could be an element.
uint32_t index;
if (name->AsArrayIndex(&index)) {
switch (obj->HasLocalElement(index)) {
case JSObject::UNDEFINED_ELEMENT:
return heap->undefined_value();
case JSObject::STRING_CHARACTER_ELEMENT: {
// Special handling of string objects according to ECMAScript 5
// 15.5.5.2. Note that this might be a string object with elements
// other than the actual string value. This is covered by the
// subsequent cases.
Handle<JSValue> js_value = Handle<JSValue>::cast(obj);
Handle<String> str(String::cast(js_value->value()));
Handle<String> substr = SubString(str, index, index + 1, NOT_TENURED);
elms->set(IS_ACCESSOR_INDEX, heap->false_value());
elms->set(VALUE_INDEX, *substr);
elms->set(WRITABLE_INDEX, heap->false_value());
elms->set(ENUMERABLE_INDEX, heap->false_value());
elms->set(CONFIGURABLE_INDEX, heap->false_value());
return *desc;
}
case JSObject::INTERCEPTED_ELEMENT:
case JSObject::FAST_ELEMENT: {
elms->set(IS_ACCESSOR_INDEX, heap->false_value());
Handle<Object> value = GetElement(obj, index);
RETURN_IF_EMPTY_HANDLE(isolate, value);
elms->set(VALUE_INDEX, *value);
elms->set(WRITABLE_INDEX, heap->true_value());
elms->set(ENUMERABLE_INDEX, heap->true_value());
elms->set(CONFIGURABLE_INDEX, heap->true_value());
return *desc;
}
case JSObject::DICTIONARY_ELEMENT: {
Handle<JSObject> holder = obj;
if (obj->IsJSGlobalProxy()) {
Object* proto = obj->GetPrototype();
if (proto->IsNull()) return heap->undefined_value();
ASSERT(proto->IsJSGlobalObject());
holder = Handle<JSObject>(JSObject::cast(proto));
}
NumberDictionary* dictionary = holder->element_dictionary();
int entry = dictionary->FindEntry(index);
ASSERT(entry != NumberDictionary::kNotFound);
PropertyDetails details = dictionary->DetailsAt(entry);
switch (details.type()) {
case CALLBACKS: {
// This is an accessor property with getter and/or setter.
FixedArray* callbacks =
FixedArray::cast(dictionary->ValueAt(entry));
elms->set(IS_ACCESSOR_INDEX, heap->true_value());
if (CheckElementAccess(*obj, index, v8::ACCESS_GET)) {
elms->set(GETTER_INDEX, callbacks->get(0));
}
if (CheckElementAccess(*obj, index, v8::ACCESS_SET)) {
elms->set(SETTER_INDEX, callbacks->get(1));
}
break;
}
case NORMAL: {
// This is a data property.
elms->set(IS_ACCESSOR_INDEX, heap->false_value());
Handle<Object> value = GetElement(obj, index);
ASSERT(!value.is_null());
elms->set(VALUE_INDEX, *value);
elms->set(WRITABLE_INDEX, heap->ToBoolean(!details.IsReadOnly()));
break;
}
default:
UNREACHABLE();
break;
}
elms->set(ENUMERABLE_INDEX, heap->ToBoolean(!details.IsDontEnum()));
elms->set(CONFIGURABLE_INDEX, heap->ToBoolean(!details.IsDontDelete()));
return *desc;
}
}
}
// Use recursive implementation to also traverse hidden prototypes
GetOwnPropertyImplementation(*obj, *name, &result);
if (!result.IsProperty()) {
return heap->undefined_value();
}
if (!CheckAccess(*obj, *name, &result, v8::ACCESS_HAS)) {
return heap->false_value();
}
elms->set(ENUMERABLE_INDEX, heap->ToBoolean(!result.IsDontEnum()));
elms->set(CONFIGURABLE_INDEX, heap->ToBoolean(!result.IsDontDelete()));
bool is_js_accessor = (result.type() == CALLBACKS) &&
(result.GetCallbackObject()->IsFixedArray());
if (is_js_accessor) {
// __defineGetter__/__defineSetter__ callback.
elms->set(IS_ACCESSOR_INDEX, heap->true_value());
FixedArray* structure = FixedArray::cast(result.GetCallbackObject());
if (CheckAccess(*obj, *name, &result, v8::ACCESS_GET)) {
elms->set(GETTER_INDEX, structure->get(0));
}
if (CheckAccess(*obj, *name, &result, v8::ACCESS_SET)) {
elms->set(SETTER_INDEX, structure->get(1));
}
} else {
elms->set(IS_ACCESSOR_INDEX, heap->false_value());
elms->set(WRITABLE_INDEX, heap->ToBoolean(!result.IsReadOnly()));
PropertyAttributes attrs;
Object* value;
// GetProperty will check access and report any violations.
{ MaybeObject* maybe_value = obj->GetProperty(*obj, &result, *name, &attrs);
if (!maybe_value->ToObject(&value)) return maybe_value;
}
elms->set(VALUE_INDEX, value);
}
return *desc;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_PreventExtensions) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSObject, obj, args[0]);
return obj->PreventExtensions();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsExtensible) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSObject, obj, args[0]);
if (obj->IsJSGlobalProxy()) {
Object* proto = obj->GetPrototype();
if (proto->IsNull()) return isolate->heap()->false_value();
ASSERT(proto->IsJSGlobalObject());
obj = JSObject::cast(proto);
}
return obj->map()->is_extensible() ? isolate->heap()->true_value()
: isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpCompile) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(JSRegExp, re, 0);
CONVERT_ARG_CHECKED(String, pattern, 1);
CONVERT_ARG_CHECKED(String, flags, 2);
Handle<Object> result = RegExpImpl::Compile(re, pattern, flags);
if (result.is_null()) return Failure::Exception();
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateApiFunction) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(FunctionTemplateInfo, data, 0);
return *isolate->factory()->CreateApiFunction(data);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsTemplate) {
ASSERT(args.length() == 1);
Object* arg = args[0];
bool result = arg->IsObjectTemplateInfo() || arg->IsFunctionTemplateInfo();
return isolate->heap()->ToBoolean(result);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetTemplateField) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(HeapObject, templ, args[0]);
CONVERT_CHECKED(Smi, field, args[1]);
int index = field->value();
int offset = index * kPointerSize + HeapObject::kHeaderSize;
InstanceType type = templ->map()->instance_type();
RUNTIME_ASSERT(type == FUNCTION_TEMPLATE_INFO_TYPE ||
type == OBJECT_TEMPLATE_INFO_TYPE);
RUNTIME_ASSERT(offset > 0);
if (type == FUNCTION_TEMPLATE_INFO_TYPE) {
RUNTIME_ASSERT(offset < FunctionTemplateInfo::kSize);
} else {
RUNTIME_ASSERT(offset < ObjectTemplateInfo::kSize);
}
return *HeapObject::RawField(templ, offset);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DisableAccessChecks) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(HeapObject, object, args[0]);
Map* old_map = object->map();
bool needs_access_checks = old_map->is_access_check_needed();
if (needs_access_checks) {
// Copy map so it won't interfere constructor's initial map.
Object* new_map;
{ MaybeObject* maybe_new_map = old_map->CopyDropTransitions();
if (!maybe_new_map->ToObject(&new_map)) return maybe_new_map;
}
Map::cast(new_map)->set_is_access_check_needed(false);
object->set_map(Map::cast(new_map));
}
return needs_access_checks ? isolate->heap()->true_value()
: isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_EnableAccessChecks) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(HeapObject, object, args[0]);
Map* old_map = object->map();
if (!old_map->is_access_check_needed()) {
// Copy map so it won't interfere constructor's initial map.
Object* new_map;
{ MaybeObject* maybe_new_map = old_map->CopyDropTransitions();
if (!maybe_new_map->ToObject(&new_map)) return maybe_new_map;
}
Map::cast(new_map)->set_is_access_check_needed(true);
object->set_map(Map::cast(new_map));
}
return isolate->heap()->undefined_value();
}
static Failure* ThrowRedeclarationError(Isolate* isolate,
const char* type,
Handle<String> name) {
HandleScope scope(isolate);
Handle<Object> type_handle =
isolate->factory()->NewStringFromAscii(CStrVector(type));
Handle<Object> args[2] = { type_handle, name };
Handle<Object> error =
isolate->factory()->NewTypeError("redeclaration", HandleVector(args, 2));
return isolate->Throw(*error);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
ASSERT(args.length() == 4);
HandleScope scope(isolate);
Handle<GlobalObject> global = Handle<GlobalObject>(
isolate->context()->global());
Handle<Context> context = args.at<Context>(0);
CONVERT_ARG_CHECKED(FixedArray, pairs, 1);
bool is_eval = Smi::cast(args[2])->value() == 1;
StrictModeFlag strict_mode =
static_cast<StrictModeFlag>(Smi::cast(args[3])->value());
ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
// Compute the property attributes. According to ECMA-262, section
// 13, page 71, the property must be read-only and
// non-deletable. However, neither SpiderMonkey nor KJS creates the
// property as read-only, so we don't either.
PropertyAttributes base = is_eval ? NONE : DONT_DELETE;
// Traverse the name/value pairs and set the properties.
int length = pairs->length();
for (int i = 0; i < length; i += 2) {
HandleScope scope(isolate);
Handle<String> name(String::cast(pairs->get(i)));
Handle<Object> value(pairs->get(i + 1), isolate);
// We have to declare a global const property. To capture we only
// assign to it when evaluating the assignment for "const x =
// <expr>" the initial value is the hole.
bool is_const_property = value->IsTheHole();
if (value->IsUndefined() || is_const_property) {
// Lookup the property in the global object, and don't set the
// value of the variable if the property is already there.
LookupResult lookup;
global->Lookup(*name, &lookup);
if (lookup.IsProperty()) {
// Determine if the property is local by comparing the holder
// against the global object. The information will be used to
// avoid throwing re-declaration errors when declaring
// variables or constants that exist in the prototype chain.
bool is_local = (*global == lookup.holder());
// Get the property attributes and determine if the property is
// read-only.
PropertyAttributes attributes = global->GetPropertyAttribute(*name);
bool is_read_only = (attributes & READ_ONLY) != 0;
if (lookup.type() == INTERCEPTOR) {
// If the interceptor says the property is there, we
// just return undefined without overwriting the property.
// Otherwise, we continue to setting the property.
if (attributes != ABSENT) {
// Check if the existing property conflicts with regards to const.
if (is_local && (is_read_only || is_const_property)) {
const char* type = (is_read_only) ? "const" : "var";
return ThrowRedeclarationError(isolate, type, name);
};
// The property already exists without conflicting: Go to
// the next declaration.
continue;
}
// Fall-through and introduce the absent property by using
// SetProperty.
} else {
// For const properties, we treat a callback with this name
// even in the prototype as a conflicting declaration.
if (is_const_property && (lookup.type() == CALLBACKS)) {
return ThrowRedeclarationError(isolate, "const", name);
}
// Otherwise, we check for locally conflicting declarations.
if (is_local && (is_read_only || is_const_property)) {
const char* type = (is_read_only) ? "const" : "var";
return ThrowRedeclarationError(isolate, type, name);
}
// The property already exists without conflicting: Go to
// the next declaration.
continue;
}
}
} else {
// Copy the function and update its context. Use it as value.
Handle<SharedFunctionInfo> shared =
Handle<SharedFunctionInfo>::cast(value);
Handle<JSFunction> function =
isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
context,
TENURED);
value = function;
}
LookupResult lookup;
global->LocalLookup(*name, &lookup);
PropertyAttributes attributes = is_const_property
? static_cast<PropertyAttributes>(base | READ_ONLY)
: base;
// There's a local property that we need to overwrite because
// we're either declaring a function or there's an interceptor
// that claims the property is absent.
//
// Check for conflicting re-declarations. We cannot have
// conflicting types in case of intercepted properties because
// they are absent.
if (lookup.IsProperty() &&
(lookup.type() != INTERCEPTOR) &&
(lookup.IsReadOnly() || is_const_property)) {
const char* type = (lookup.IsReadOnly()) ? "const" : "var";
return ThrowRedeclarationError(isolate, type, name);
}
// Safari does not allow the invocation of callback setters for
// function declarations. To mimic this behavior, we do not allow
// the invocation of setters for function values. This makes a
// difference for global functions with the same names as event
// handlers such as "function onload() {}". Firefox does call the
// onload setter in those case and Safari does not. We follow
// Safari for compatibility.
if (value->IsJSFunction()) {
// Do not change DONT_DELETE to false from true.
if (lookup.IsProperty() && (lookup.type() != INTERCEPTOR)) {
attributes = static_cast<PropertyAttributes>(
attributes | (lookup.GetAttributes() & DONT_DELETE));
}
RETURN_IF_EMPTY_HANDLE(isolate,
SetLocalPropertyIgnoreAttributes(global,
name,
value,
attributes));
} else {
RETURN_IF_EMPTY_HANDLE(isolate,
SetProperty(global,
name,
value,
attributes,
strict_mode));
}
}
ASSERT(!isolate->has_pending_exception());
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareContextSlot) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(Context, context, 0);
Handle<String> name(String::cast(args[1]));
PropertyAttributes mode =
static_cast<PropertyAttributes>(Smi::cast(args[2])->value());
RUNTIME_ASSERT(mode == READ_ONLY || mode == NONE);
Handle<Object> initial_value(args[3], isolate);
// Declarations are always done in the function context.
context = Handle<Context>(context->fcontext());
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = DONT_FOLLOW_CHAINS;
Handle<Object> holder =
context->Lookup(name, flags, &index, &attributes);
if (attributes != ABSENT) {
// The name was declared before; check for conflicting
// re-declarations: This is similar to the code in parser.cc in
// the AstBuildingParser::Declare function.
if (((attributes & READ_ONLY) != 0) || (mode == READ_ONLY)) {
// Functions are not read-only.
ASSERT(mode != READ_ONLY || initial_value->IsTheHole());
const char* type = ((attributes & READ_ONLY) != 0) ? "const" : "var";
return ThrowRedeclarationError(isolate, type, name);
}
// Initialize it if necessary.
if (*initial_value != NULL) {
if (index >= 0) {
// The variable or constant context slot should always be in
// the function context or the arguments object.
if (holder->IsContext()) {
ASSERT(holder.is_identical_to(context));
if (((attributes & READ_ONLY) == 0) ||
context->get(index)->IsTheHole()) {
context->set(index, *initial_value);
}
} else {
// The holder is an arguments object.
Handle<JSObject> arguments(Handle<JSObject>::cast(holder));
Handle<Object> result = SetElement(arguments, index, initial_value,
kNonStrictMode);
if (result.is_null()) return Failure::Exception();
}
} else {
// Slow case: The property is not in the FixedArray part of the context.
Handle<JSObject> context_ext = Handle<JSObject>::cast(holder);
RETURN_IF_EMPTY_HANDLE(
isolate,
SetProperty(context_ext, name, initial_value,
mode, kNonStrictMode));
}
}
} else {
// The property is not in the function context. It needs to be
// "declared" in the function context's extension context, or in the
// global context.
Handle<JSObject> context_ext;
if (context->has_extension()) {
// The function context's extension context exists - use it.
context_ext = Handle<JSObject>(context->extension());
} else {
// The function context's extension context does not exists - allocate
// it.
context_ext = isolate->factory()->NewJSObject(
isolate->context_extension_function());
// And store it in the extension slot.
context->set_extension(*context_ext);
}
ASSERT(*context_ext != NULL);
// Declare the property by setting it to the initial value if provided,
// or undefined, and use the correct mode (e.g. READ_ONLY attribute for
// constant declarations).
ASSERT(!context_ext->HasLocalProperty(*name));
Handle<Object> value(isolate->heap()->undefined_value(), isolate);
if (*initial_value != NULL) value = initial_value;
// Declaring a const context slot is a conflicting declaration if
// there is a callback with that name in a prototype. It is
// allowed to introduce const variables in
// JSContextExtensionObjects. They are treated specially in
// SetProperty and no setters are invoked for those since they are
// not real JSObjects.
if (initial_value->IsTheHole() &&
!context_ext->IsJSContextExtensionObject()) {
LookupResult lookup;
context_ext->Lookup(*name, &lookup);
if (lookup.IsProperty() && (lookup.type() == CALLBACKS)) {
return ThrowRedeclarationError(isolate, "const", name);
}
}
RETURN_IF_EMPTY_HANDLE(isolate,
SetProperty(context_ext, name, value, mode,
kNonStrictMode));
}
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeVarGlobal) {
NoHandleAllocation nha;
// args[0] == name
// args[1] == strict_mode
// args[2] == value (optional)
// Determine if we need to assign to the variable if it already
// exists (based on the number of arguments).
RUNTIME_ASSERT(args.length() == 2 || args.length() == 3);
bool assign = args.length() == 3;
CONVERT_ARG_CHECKED(String, name, 0);
GlobalObject* global = isolate->context()->global();
RUNTIME_ASSERT(args[1]->IsSmi());
StrictModeFlag strict_mode =
static_cast<StrictModeFlag>(Smi::cast(args[1])->value());
ASSERT(strict_mode == kStrictMode || strict_mode == kNonStrictMode);
// According to ECMA-262, section 12.2, page 62, the property must
// not be deletable.
PropertyAttributes attributes = DONT_DELETE;
// Lookup the property locally in the global object. If it isn't
// there, there is a property with this name in the prototype chain.
// We follow Safari and Firefox behavior and only set the property
// locally if there is an explicit initialization value that we have
// to assign to the property.
// Note that objects can have hidden prototypes, so we need to traverse
// the whole chain of hidden prototypes to do a 'local' lookup.
JSObject* real_holder = global;
LookupResult lookup;
while (true) {
real_holder->LocalLookup(*name, &lookup);
if (lookup.IsProperty()) {
// Determine if this is a redeclaration of something read-only.
if (lookup.IsReadOnly()) {
// If we found readonly property on one of hidden prototypes,
// just shadow it.
if (real_holder != isolate->context()->global()) break;
return ThrowRedeclarationError(isolate, "const", name);
}
// Determine if this is a redeclaration of an intercepted read-only
// property and figure out if the property exists at all.
bool found = true;
PropertyType type = lookup.type();
if (type == INTERCEPTOR) {
HandleScope handle_scope(isolate);
Handle<JSObject> holder(real_holder);
PropertyAttributes intercepted = holder->GetPropertyAttribute(*name);
real_holder = *holder;
if (intercepted == ABSENT) {
// The interceptor claims the property isn't there. We need to
// make sure to introduce it.
found = false;
} else if ((intercepted & READ_ONLY) != 0) {
// The property is present, but read-only. Since we're trying to
// overwrite it with a variable declaration we must throw a
// re-declaration error. However if we found readonly property
// on one of hidden prototypes, just shadow it.
if (real_holder != isolate->context()->global()) break;
return ThrowRedeclarationError(isolate, "const", name);
}
}
if (found && !assign) {
// The global property is there and we're not assigning any value
// to it. Just return.
return isolate->heap()->undefined_value();
}
// Assign the value (or undefined) to the property.
Object* value = (assign) ? args[2] : isolate->heap()->undefined_value();
return real_holder->SetProperty(
&lookup, *name, value, attributes, strict_mode);
}
Object* proto = real_holder->GetPrototype();
if (!proto->IsJSObject())
break;
if (!JSObject::cast(proto)->map()->is_hidden_prototype())
break;
real_holder = JSObject::cast(proto);
}
global = isolate->context()->global();
if (assign) {
return global->SetProperty(*name, args[2], attributes, strict_mode);
}
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
// All constants are declared with an initial value. The name
// of the constant is the first argument and the initial value
// is the second.
RUNTIME_ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(String, name, 0);
Handle<Object> value = args.at<Object>(1);
// Get the current global object from top.
GlobalObject* global = isolate->context()->global();
// According to ECMA-262, section 12.2, page 62, the property must
// not be deletable. Since it's a const, it must be READ_ONLY too.
PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
// Lookup the property locally in the global object. If it isn't
// there, we add the property and take special precautions to always
// add it as a local property even in case of callbacks in the
// prototype chain (this rules out using SetProperty).
// We use SetLocalPropertyIgnoreAttributes instead
LookupResult lookup;
global->LocalLookup(*name, &lookup);
if (!lookup.IsProperty()) {
return global->SetLocalPropertyIgnoreAttributes(*name,
*value,
attributes);
}
// Determine if this is a redeclaration of something not
// read-only. In case the result is hidden behind an interceptor we
// need to ask it for the property attributes.
if (!lookup.IsReadOnly()) {
if (lookup.type() != INTERCEPTOR) {
return ThrowRedeclarationError(isolate, "var", name);
}
PropertyAttributes intercepted = global->GetPropertyAttribute(*name);
// Throw re-declaration error if the intercepted property is present
// but not read-only.
if (intercepted != ABSENT && (intercepted & READ_ONLY) == 0) {
return ThrowRedeclarationError(isolate, "var", name);
}
// Restore global object from context (in case of GC) and continue
// with setting the value because the property is either absent or
// read-only. We also have to do redo the lookup.
HandleScope handle_scope(isolate);
Handle<GlobalObject> global(isolate->context()->global());
// BUG 1213575: Handle the case where we have to set a read-only
// property through an interceptor and only do it if it's
// uninitialized, e.g. the hole. Nirk...
// Passing non-strict mode because the property is writable.
RETURN_IF_EMPTY_HANDLE(isolate,
SetProperty(global,
name,
value,
attributes,
kNonStrictMode));
return *value;
}
// Set the value, but only we're assigning the initial value to a
// constant. For now, we determine this by checking if the
// current value is the hole.
// Strict mode handling not needed (const disallowed in strict mode).
PropertyType type = lookup.type();
if (type == FIELD) {
FixedArray* properties = global->properties();
int index = lookup.GetFieldIndex();
if (properties->get(index)->IsTheHole()) {
properties->set(index, *value);
}
} else if (type == NORMAL) {
if (global->GetNormalizedProperty(&lookup)->IsTheHole()) {
global->SetNormalizedProperty(&lookup, *value);
}
} else {
// Ignore re-initialization of constants that have already been
// assigned a function value.
ASSERT(lookup.IsReadOnly() && type == CONSTANT_FUNCTION);
}
// Use the set value as the result of the operation.
return *value;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstContextSlot) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
Handle<Object> value(args[0], isolate);
ASSERT(!value->IsTheHole());
CONVERT_ARG_CHECKED(Context, context, 1);
Handle<String> name(String::cast(args[2]));
// Initializations are always done in the function context.
context = Handle<Context>(context->fcontext());
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = FOLLOW_CHAINS;
Handle<Object> holder =
context->Lookup(name, flags, &index, &attributes);
// In most situations, the property introduced by the const
// declaration should be present in the context extension object.
// However, because declaration and initialization are separate, the
// property might have been deleted (if it was introduced by eval)
// before we reach the initialization point.
//
// Example:
//
// function f() { eval("delete x; const x;"); }
//
// In that case, the initialization behaves like a normal assignment
// to property 'x'.
if (index >= 0) {
// Property was found in a context.
if (holder->IsContext()) {
// The holder cannot be the function context. If it is, there
// should have been a const redeclaration error when declaring
// the const property.
ASSERT(!holder.is_identical_to(context));
if ((attributes & READ_ONLY) == 0) {
Handle<Context>::cast(holder)->set(index, *value);
}
} else {
// The holder is an arguments object.
ASSERT((attributes & READ_ONLY) == 0);
Handle<JSObject> arguments(Handle<JSObject>::cast(holder));
RETURN_IF_EMPTY_HANDLE(
isolate,
SetElement(arguments, index, value, kNonStrictMode));
}
return *value;
}
// The property could not be found, we introduce it in the global
// context.
if (attributes == ABSENT) {
Handle<JSObject> global = Handle<JSObject>(
isolate->context()->global());
// Strict mode not needed (const disallowed in strict mode).
RETURN_IF_EMPTY_HANDLE(
isolate,
SetProperty(global, name, value, NONE, kNonStrictMode));
return *value;
}
// The property was present in a context extension object.
Handle<JSObject> context_ext = Handle<JSObject>::cast(holder);
if (*context_ext == context->extension()) {
// This is the property that was introduced by the const
// declaration. Set it if it hasn't been set before. NOTE: We
// cannot use GetProperty() to get the current value as it
// 'unholes' the value.
LookupResult lookup;
context_ext->LocalLookupRealNamedProperty(*name, &lookup);
ASSERT(lookup.IsProperty()); // the property was declared
ASSERT(lookup.IsReadOnly()); // and it was declared as read-only
PropertyType type = lookup.type();
if (type == FIELD) {
FixedArray* properties = context_ext->properties();
int index = lookup.GetFieldIndex();
if (properties->get(index)->IsTheHole()) {
properties->set(index, *value);
}
} else if (type == NORMAL) {
if (context_ext->GetNormalizedProperty(&lookup)->IsTheHole()) {
context_ext->SetNormalizedProperty(&lookup, *value);
}
} else {
// We should not reach here. Any real, named property should be
// either a field or a dictionary slot.
UNREACHABLE();
}
} else {
// The property was found in a different context extension object.
// Set it if it is not a read-only property.
if ((attributes & READ_ONLY) == 0) {
// Strict mode not needed (const disallowed in strict mode).
RETURN_IF_EMPTY_HANDLE(
isolate,
SetProperty(context_ext, name, value, attributes, kNonStrictMode));
}
}
return *value;
}
RUNTIME_FUNCTION(MaybeObject*,
Runtime_OptimizeObjectForAddingMultipleProperties) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSObject, object, 0);
CONVERT_SMI_CHECKED(properties, args[1]);
if (object->HasFastProperties()) {
NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties);
}
return *object;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpExec) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(JSRegExp, regexp, 0);
CONVERT_ARG_CHECKED(String, subject, 1);
// Due to the way the JS calls are constructed this must be less than the
// length of a string, i.e. it is always a Smi. We check anyway for security.
CONVERT_SMI_CHECKED(index, args[2]);
CONVERT_ARG_CHECKED(JSArray, last_match_info, 3);
RUNTIME_ASSERT(last_match_info->HasFastElements());
RUNTIME_ASSERT(index >= 0);
RUNTIME_ASSERT(index <= subject->length());
isolate->counters()->regexp_entry_runtime()->Increment();
Handle<Object> result = RegExpImpl::Exec(regexp,
subject,
index,
last_match_info);
if (result.is_null()) return Failure::Exception();
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpConstructResult) {
ASSERT(args.length() == 3);
CONVERT_SMI_CHECKED(elements_count, args[0]);
if (elements_count > JSArray::kMaxFastElementsLength) {
return isolate->ThrowIllegalOperation();
}
Object* new_object;
{ MaybeObject* maybe_new_object =
isolate->heap()->AllocateFixedArrayWithHoles(elements_count);
if (!maybe_new_object->ToObject(&new_object)) return maybe_new_object;
}
FixedArray* elements = FixedArray::cast(new_object);
{ MaybeObject* maybe_new_object = isolate->heap()->AllocateRaw(
JSRegExpResult::kSize, NEW_SPACE, OLD_POINTER_SPACE);
if (!maybe_new_object->ToObject(&new_object)) return maybe_new_object;
}
{
AssertNoAllocation no_gc;
HandleScope scope(isolate);
reinterpret_cast<HeapObject*>(new_object)->
set_map(isolate->global_context()->regexp_result_map());
}
JSArray* array = JSArray::cast(new_object);
array->set_properties(isolate->heap()->empty_fixed_array());
array->set_elements(elements);
array->set_length(Smi::FromInt(elements_count));
// Write in-object properties after the length of the array.
array->InObjectPropertyAtPut(JSRegExpResult::kIndexIndex, args[1]);
array->InObjectPropertyAtPut(JSRegExpResult::kInputIndex, args[2]);
return array;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpInitializeObject) {
AssertNoAllocation no_alloc;
ASSERT(args.length() == 5);
CONVERT_CHECKED(JSRegExp, regexp, args[0]);
CONVERT_CHECKED(String, source, args[1]);
Object* global = args[2];
if (!global->IsTrue()) global = isolate->heap()->false_value();
Object* ignoreCase = args[3];
if (!ignoreCase->IsTrue()) ignoreCase = isolate->heap()->false_value();
Object* multiline = args[4];
if (!multiline->IsTrue()) multiline = isolate->heap()->false_value();
Map* map = regexp->map();
Object* constructor = map->constructor();
if (constructor->IsJSFunction() &&
JSFunction::cast(constructor)->initial_map() == map) {
// If we still have the original map, set in-object properties directly.
regexp->InObjectPropertyAtPut(JSRegExp::kSourceFieldIndex, source);
// TODO(lrn): Consider skipping write barrier on booleans as well.
// Both true and false should be in oldspace at all times.
regexp->InObjectPropertyAtPut(JSRegExp::kGlobalFieldIndex, global);
regexp->InObjectPropertyAtPut(JSRegExp::kIgnoreCaseFieldIndex, ignoreCase);
regexp->InObjectPropertyAtPut(JSRegExp::kMultilineFieldIndex, multiline);
regexp->InObjectPropertyAtPut(JSRegExp::kLastIndexFieldIndex,
Smi::FromInt(0),
SKIP_WRITE_BARRIER);
return regexp;
}
// Map has changed, so use generic, but slower, method.
PropertyAttributes final =
static_cast<PropertyAttributes>(READ_ONLY | DONT_ENUM | DONT_DELETE);
PropertyAttributes writable =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
Heap* heap = isolate->heap();
MaybeObject* result;
result = regexp->SetLocalPropertyIgnoreAttributes(heap->source_symbol(),
source,
final);
ASSERT(!result->IsFailure());
result = regexp->SetLocalPropertyIgnoreAttributes(heap->global_symbol(),
global,
final);
ASSERT(!result->IsFailure());
result =
regexp->SetLocalPropertyIgnoreAttributes(heap->ignore_case_symbol(),
ignoreCase,
final);
ASSERT(!result->IsFailure());
result = regexp->SetLocalPropertyIgnoreAttributes(heap->multiline_symbol(),
multiline,
final);
ASSERT(!result->IsFailure());
result =
regexp->SetLocalPropertyIgnoreAttributes(heap->last_index_symbol(),
Smi::FromInt(0),
writable);
ASSERT(!result->IsFailure());
USE(result);
return regexp;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FinishArrayPrototypeSetup) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSArray, prototype, 0);
// This is necessary to enable fast checks for absence of elements
// on Array.prototype and below.
prototype->set_elements(isolate->heap()->empty_fixed_array());
return Smi::FromInt(0);
}
static Handle<JSFunction> InstallBuiltin(Isolate* isolate,
Handle<JSObject> holder,
const char* name,
Builtins::Name builtin_name) {
Handle<String> key = isolate->factory()->LookupAsciiSymbol(name);
Handle<Code> code(isolate->builtins()->builtin(builtin_name));
Handle<JSFunction> optimized =
isolate->factory()->NewFunction(key,
JS_OBJECT_TYPE,
JSObject::kHeaderSize,
code,
false);
optimized->shared()->DontAdaptArguments();
SetProperty(holder, key, optimized, NONE, kStrictMode);
return optimized;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SpecialArrayFunctions) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSObject, holder, 0);
InstallBuiltin(isolate, holder, "pop", Builtins::kArrayPop);
InstallBuiltin(isolate, holder, "push", Builtins::kArrayPush);
InstallBuiltin(isolate, holder, "shift", Builtins::kArrayShift);
InstallBuiltin(isolate, holder, "unshift", Builtins::kArrayUnshift);
InstallBuiltin(isolate, holder, "slice", Builtins::kArraySlice);
InstallBuiltin(isolate, holder, "splice", Builtins::kArraySplice);
InstallBuiltin(isolate, holder, "concat", Builtins::kArrayConcat);
return *holder;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetGlobalReceiver) {
// Returns a real global receiver, not one of builtins object.
Context* global_context =
isolate->context()->global()->global_context();
return global_context->global()->global_receiver();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MaterializeRegExpLiteral) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
int index = Smi::cast(args[1])->value();
Handle<String> pattern = args.at<String>(2);
Handle<String> flags = args.at<String>(3);
// Get the RegExp function from the context in the literals array.
// This is the RegExp function from the context in which the
// function was created. We do not use the RegExp function from the
// current global context because this might be the RegExp function
// from another context which we should not have access to.
Handle<JSFunction> constructor =
Handle<JSFunction>(
JSFunction::GlobalContextFromLiterals(*literals)->regexp_function());
// Compute the regular expression literal.
bool has_pending_exception;
Handle<Object> regexp =
RegExpImpl::CreateRegExpLiteral(constructor, pattern, flags,
&has_pending_exception);
if (has_pending_exception) {
ASSERT(isolate->has_pending_exception());
return Failure::Exception();
}
literals->set(index, *regexp);
return *regexp;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetName) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
return f->shared()->name();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionSetName) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSFunction, f, args[0]);
CONVERT_CHECKED(String, name, args[1]);
f->shared()->set_name(name);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionRemovePrototype) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
Object* obj = f->RemovePrototype();
if (obj->IsFailure()) return obj;
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetScript) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, fun, args[0]);
Handle<Object> script = Handle<Object>(fun->shared()->script(), isolate);
if (!script->IsScript()) return isolate->heap()->undefined_value();
return *GetScriptWrapper(Handle<Script>::cast(script));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetSourceCode) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
return f->shared()->GetSourceCode();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetScriptSourcePosition) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, fun, args[0]);
int pos = fun->shared()->start_position();
return Smi::FromInt(pos);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetPositionForOffset) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(Code, code, args[0]);
CONVERT_NUMBER_CHECKED(int, offset, Int32, args[1]);
RUNTIME_ASSERT(0 <= offset && offset < code->Size());
Address pc = code->address() + offset;
return Smi::FromInt(code->SourcePosition(pc));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionSetInstanceClassName) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSFunction, fun, args[0]);
CONVERT_CHECKED(String, name, args[1]);
fun->SetInstanceClassName(name);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionSetLength) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSFunction, fun, args[0]);
CONVERT_CHECKED(Smi, length, args[1]);
fun->shared()->set_length(length->value());
return length;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionSetPrototype) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSFunction, fun, args[0]);
ASSERT(fun->should_have_prototype());
Object* obj;
{ MaybeObject* maybe_obj =
Accessors::FunctionSetPrototype(fun, args[1], NULL);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
return args[0]; // return TOS
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionIsAPIFunction) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
return f->shared()->IsApiFunction() ? isolate->heap()->true_value()
: isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionIsBuiltin) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
return f->IsBuiltin() ? isolate->heap()->true_value() :
isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetCode) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSFunction, target, 0);
Handle<Object> code = args.at<Object>(1);
Handle<Context> context(target->context());
if (!code->IsNull()) {
RUNTIME_ASSERT(code->IsJSFunction());
Handle<JSFunction> fun = Handle<JSFunction>::cast(code);
Handle<SharedFunctionInfo> shared(fun->shared());
if (!EnsureCompiled(shared, KEEP_EXCEPTION)) {
return Failure::Exception();
}
// Since we don't store the source for this we should never
// optimize this.
shared->code()->set_optimizable(false);
// Set the code, scope info, formal parameter count,
// and the length of the target function.
target->shared()->set_code(shared->code());
target->ReplaceCode(shared->code());
target->shared()->set_scope_info(shared->scope_info());
target->shared()->set_length(shared->length());
target->shared()->set_formal_parameter_count(
shared->formal_parameter_count());
// Set the source code of the target function to undefined.
// SetCode is only used for built-in constructors like String,
// Array, and Object, and some web code
// doesn't like seeing source code for constructors.
target->shared()->set_script(isolate->heap()->undefined_value());
target->shared()->code()->set_optimizable(false);
// Clear the optimization hints related to the compiled code as these are no
// longer valid when the code is overwritten.
target->shared()->ClearThisPropertyAssignmentsInfo();
context = Handle<Context>(fun->context());
// Make sure we get a fresh copy of the literal vector to avoid
// cross context contamination.
int number_of_literals = fun->NumberOfLiterals();
Handle<FixedArray> literals =
isolate->factory()->NewFixedArray(number_of_literals, TENURED);
if (number_of_literals > 0) {
// Insert the object, regexp and array functions in the literals
// array prefix. These are the functions that will be used when
// creating object, regexp and array literals.
literals->set(JSFunction::kLiteralGlobalContextIndex,
context->global_context());
}
// It's okay to skip the write barrier here because the literals
// are guaranteed to be in old space.
target->set_literals(*literals, SKIP_WRITE_BARRIER);
target->set_next_function_link(isolate->heap()->undefined_value());
}
target->set_context(*context);
return *target;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetExpectedNumberOfProperties) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
CONVERT_SMI_CHECKED(num, args[1]);
RUNTIME_ASSERT(num >= 0);
SetExpectedNofProperties(function, num);
return isolate->heap()->undefined_value();
}
MUST_USE_RESULT static MaybeObject* CharFromCode(Isolate* isolate,
Object* char_code) {
uint32_t code;
if (char_code->ToArrayIndex(&code)) {
if (code <= 0xffff) {
return isolate->heap()->LookupSingleCharacterStringFromCode(code);
}
}
return isolate->heap()->empty_string();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringCharCodeAt) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, subject, args[0]);
Object* index = args[1];
RUNTIME_ASSERT(index->IsNumber());
uint32_t i = 0;
if (index->IsSmi()) {
int value = Smi::cast(index)->value();
if (value < 0) return isolate->heap()->nan_value();
i = value;
} else {
ASSERT(index->IsHeapNumber());
double value = HeapNumber::cast(index)->value();
i = static_cast<uint32_t>(DoubleToInteger(value));
}
// Flatten the string. If someone wants to get a char at an index
// in a cons string, it is likely that more indices will be
// accessed.
Object* flat;
{ MaybeObject* maybe_flat = subject->TryFlatten();
if (!maybe_flat->ToObject(&flat)) return maybe_flat;
}
subject = String::cast(flat);
if (i >= static_cast<uint32_t>(subject->length())) {
return isolate->heap()->nan_value();
}
return Smi::FromInt(subject->Get(i));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CharFromCode) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
return CharFromCode(isolate, args[0]);
}
class FixedArrayBuilder {
public:
explicit FixedArrayBuilder(Isolate* isolate, int initial_capacity)
: array_(isolate->factory()->NewFixedArrayWithHoles(initial_capacity)),
length_(0) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
ASSERT(initial_capacity > 0);
}
explicit FixedArrayBuilder(Handle<FixedArray> backing_store)
: array_(backing_store),
length_(0) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
ASSERT(backing_store->length() > 0);
}
bool HasCapacity(int elements) {
int length = array_->length();
int required_length = length_ + elements;
return (length >= required_length);
}
void EnsureCapacity(int elements) {
int length = array_->length();
int required_length = length_ + elements;
if (length < required_length) {
int new_length = length;
do {
new_length *= 2;
} while (new_length < required_length);
Handle<FixedArray> extended_array =
array_->GetIsolate()->factory()->NewFixedArrayWithHoles(new_length);
array_->CopyTo(0, *extended_array, 0, length_);
array_ = extended_array;
}
}
void Add(Object* value) {
ASSERT(length_ < capacity());
array_->set(length_, value);
length_++;
}
void Add(Smi* value) {
ASSERT(length_ < capacity());
array_->set(length_, value);
length_++;
}
Handle<FixedArray> array() {
return array_;
}
int length() {
return length_;
}
int capacity() {
return array_->length();
}
Handle<JSArray> ToJSArray() {
Handle<JSArray> result_array = FACTORY->NewJSArrayWithElements(array_);
result_array->set_length(Smi::FromInt(length_));
return result_array;
}
Handle<JSArray> ToJSArray(Handle<JSArray> target_array) {
target_array->set_elements(*array_);
target_array->set_length(Smi::FromInt(length_));
return target_array;
}
private:
Handle<FixedArray> array_;
int length_;
};
// Forward declarations.
const int kStringBuilderConcatHelperLengthBits = 11;
const int kStringBuilderConcatHelperPositionBits = 19;
template <typename schar>
static inline void StringBuilderConcatHelper(String*,
schar*,
FixedArray*,
int);
typedef BitField<int, 0, kStringBuilderConcatHelperLengthBits>
StringBuilderSubstringLength;
typedef BitField<int,
kStringBuilderConcatHelperLengthBits,
kStringBuilderConcatHelperPositionBits>
StringBuilderSubstringPosition;
class ReplacementStringBuilder {
public:
ReplacementStringBuilder(Heap* heap,
Handle<String> subject,
int estimated_part_count)
: heap_(heap),
array_builder_(heap->isolate(), estimated_part_count),
subject_(subject),
character_count_(0),
is_ascii_(subject->IsAsciiRepresentation()) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
ASSERT(estimated_part_count > 0);
}
static inline void AddSubjectSlice(FixedArrayBuilder* builder,
int from,
int to) {
ASSERT(from >= 0);
int length = to - from;
ASSERT(length > 0);
if (StringBuilderSubstringLength::is_valid(length) &&
StringBuilderSubstringPosition::is_valid(from)) {
int encoded_slice = StringBuilderSubstringLength::encode(length) |
StringBuilderSubstringPosition::encode(from);
builder->Add(Smi::FromInt(encoded_slice));
} else {
// Otherwise encode as two smis.
builder->Add(Smi::FromInt(-length));
builder->Add(Smi::FromInt(from));
}
}
void EnsureCapacity(int elements) {
array_builder_.EnsureCapacity(elements);
}
void AddSubjectSlice(int from, int to) {
AddSubjectSlice(&array_builder_, from, to);
IncrementCharacterCount(to - from);
}
void AddString(Handle<String> string) {
int length = string->length();
ASSERT(length > 0);
AddElement(*string);
if (!string->IsAsciiRepresentation()) {
is_ascii_ = false;
}
IncrementCharacterCount(length);
}
Handle<String> ToString() {
if (array_builder_.length() == 0) {
return heap_->isolate()->factory()->empty_string();
}
Handle<String> joined_string;
if (is_ascii_) {
joined_string = NewRawAsciiString(character_count_);
AssertNoAllocation no_alloc;
SeqAsciiString* seq = SeqAsciiString::cast(*joined_string);
char* char_buffer = seq->GetChars();
StringBuilderConcatHelper(*subject_,
char_buffer,
*array_builder_.array(),
array_builder_.length());
} else {
// Non-ASCII.
joined_string = NewRawTwoByteString(character_count_);
AssertNoAllocation no_alloc;
SeqTwoByteString* seq = SeqTwoByteString::cast(*joined_string);
uc16* char_buffer = seq->GetChars();
StringBuilderConcatHelper(*subject_,
char_buffer,
*array_builder_.array(),
array_builder_.length());
}
return joined_string;
}
void IncrementCharacterCount(int by) {
if (character_count_ > String::kMaxLength - by) {
V8::FatalProcessOutOfMemory("String.replace result too large.");
}
character_count_ += by;
}
Handle<JSArray> GetParts() {
return array_builder_.ToJSArray();
}
private:
Handle<String> NewRawAsciiString(int size) {
CALL_HEAP_FUNCTION(heap_->isolate(),
heap_->AllocateRawAsciiString(size), String);
}
Handle<String> NewRawTwoByteString(int size) {
CALL_HEAP_FUNCTION(heap_->isolate(),
heap_->AllocateRawTwoByteString(size), String);
}
void AddElement(Object* element) {
ASSERT(element->IsSmi() || element->IsString());
ASSERT(array_builder_.capacity() > array_builder_.length());
array_builder_.Add(element);
}
Heap* heap_;
FixedArrayBuilder array_builder_;
Handle<String> subject_;
int character_count_;
bool is_ascii_;
};
class CompiledReplacement {
public:
CompiledReplacement()
: parts_(1), replacement_substrings_(0) {}
void Compile(Handle<String> replacement,
int capture_count,
int subject_length);
void Apply(ReplacementStringBuilder* builder,
int match_from,
int match_to,
Handle<JSArray> last_match_info);
// Number of distinct parts of the replacement pattern.
int parts() {
return parts_.length();
}
private:
enum PartType {
SUBJECT_PREFIX = 1,
SUBJECT_SUFFIX,
SUBJECT_CAPTURE,
REPLACEMENT_SUBSTRING,
REPLACEMENT_STRING,
NUMBER_OF_PART_TYPES
};
struct ReplacementPart {
static inline ReplacementPart SubjectMatch() {
return ReplacementPart(SUBJECT_CAPTURE, 0);
}
static inline ReplacementPart SubjectCapture(int capture_index) {
return ReplacementPart(SUBJECT_CAPTURE, capture_index);
}
static inline ReplacementPart SubjectPrefix() {
return ReplacementPart(SUBJECT_PREFIX, 0);
}
static inline ReplacementPart SubjectSuffix(int subject_length) {
return ReplacementPart(SUBJECT_SUFFIX, subject_length);
}
static inline ReplacementPart ReplacementString() {
return ReplacementPart(REPLACEMENT_STRING, 0);
}
static inline ReplacementPart ReplacementSubString(int from, int to) {
ASSERT(from >= 0);
ASSERT(to > from);
return ReplacementPart(-from, to);
}
// If tag <= 0 then it is the negation of a start index of a substring of
// the replacement pattern, otherwise it's a value from PartType.
ReplacementPart(int tag, int data)
: tag(tag), data(data) {
// Must be non-positive or a PartType value.
ASSERT(tag < NUMBER_OF_PART_TYPES);
}
// Either a value of PartType or a non-positive number that is
// the negation of an index into the replacement string.
int tag;
// The data value's interpretation depends on the value of tag:
// tag == SUBJECT_PREFIX ||
// tag == SUBJECT_SUFFIX: data is unused.
// tag == SUBJECT_CAPTURE: data is the number of the capture.
// tag == REPLACEMENT_SUBSTRING ||
// tag == REPLACEMENT_STRING: data is index into array of substrings
// of the replacement string.
// tag <= 0: Temporary representation of the substring of the replacement
// string ranging over -tag .. data.
// Is replaced by REPLACEMENT_{SUB,}STRING when we create the
// substring objects.
int data;
};
template<typename Char>
static void ParseReplacementPattern(ZoneList<ReplacementPart>* parts,
Vector<Char> characters,
int capture_count,
int subject_length) {
int length = characters.length();
int last = 0;
for (int i = 0; i < length; i++) {
Char c = characters[i];
if (c == '$') {
int next_index = i + 1;
if (next_index == length) { // No next character!
break;
}
Char c2 = characters[next_index];
switch (c2) {
case '$':
if (i > last) {
// There is a substring before. Include the first "$".
parts->Add(ReplacementPart::ReplacementSubString(last, next_index));
last = next_index + 1; // Continue after the second "$".
} else {
// Let the next substring start with the second "$".
last = next_index;
}
i = next_index;
break;
case '`':
if (i > last) {
parts->Add(ReplacementPart::ReplacementSubString(last, i));
}
parts->Add(ReplacementPart::SubjectPrefix());
i = next_index;
last = i + 1;
break;
case '\'':
if (i > last) {
parts->Add(ReplacementPart::ReplacementSubString(last, i));
}
parts->Add(ReplacementPart::SubjectSuffix(subject_length));
i = next_index;
last = i + 1;
break;
case '&':
if (i > last) {
parts->Add(ReplacementPart::ReplacementSubString(last, i));
}
parts->Add(ReplacementPart::SubjectMatch());
i = next_index;
last = i + 1;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': {
int capture_ref = c2 - '0';
if (capture_ref > capture_count) {
i = next_index;
continue;
}
int second_digit_index = next_index + 1;
if (second_digit_index < length) {
// Peek ahead to see if we have two digits.
Char c3 = characters[second_digit_index];
if ('0' <= c3 && c3 <= '9') { // Double digits.
int double_digit_ref = capture_ref * 10 + c3 - '0';
if (double_digit_ref <= capture_count) {
next_index = second_digit_index;
capture_ref = double_digit_ref;
}
}
}
if (capture_ref > 0) {
if (i > last) {
parts->Add(ReplacementPart::ReplacementSubString(last, i));
}
ASSERT(capture_ref <= capture_count);
parts->Add(ReplacementPart::SubjectCapture(capture_ref));
last = next_index + 1;
}
i = next_index;
break;
}
default:
i = next_index;
break;
}
}
}
if (length > last) {
if (last == 0) {
parts->Add(ReplacementPart::ReplacementString());
} else {
parts->Add(ReplacementPart::ReplacementSubString(last, length));
}
}
}
ZoneList<ReplacementPart> parts_;
ZoneList<Handle<String> > replacement_substrings_;
};
void CompiledReplacement::Compile(Handle<String> replacement,
int capture_count,
int subject_length) {
ASSERT(replacement->IsFlat());
if (replacement->IsAsciiRepresentation()) {
AssertNoAllocation no_alloc;
ParseReplacementPattern(&parts_,
replacement->ToAsciiVector(),
capture_count,
subject_length);
} else {
ASSERT(replacement->IsTwoByteRepresentation());
AssertNoAllocation no_alloc;
ParseReplacementPattern(&parts_,
replacement->ToUC16Vector(),
capture_count,
subject_length);
}
Isolate* isolate = replacement->GetIsolate();
// Find substrings of replacement string and create them as String objects.
int substring_index = 0;
for (int i = 0, n = parts_.length(); i < n; i++) {
int tag = parts_[i].tag;
if (tag <= 0) { // A replacement string slice.
int from = -tag;
int to = parts_[i].data;
replacement_substrings_.Add(
isolate->factory()->NewSubString(replacement, from, to));
parts_[i].tag = REPLACEMENT_SUBSTRING;
parts_[i].data = substring_index;
substring_index++;
} else if (tag == REPLACEMENT_STRING) {
replacement_substrings_.Add(replacement);
parts_[i].data = substring_index;
substring_index++;
}
}
}
void CompiledReplacement::Apply(ReplacementStringBuilder* builder,
int match_from,
int match_to,
Handle<JSArray> last_match_info) {
for (int i = 0, n = parts_.length(); i < n; i++) {
ReplacementPart part = parts_[i];
switch (part.tag) {
case SUBJECT_PREFIX:
if (match_from > 0) builder->AddSubjectSlice(0, match_from);
break;
case SUBJECT_SUFFIX: {
int subject_length = part.data;
if (match_to < subject_length) {
builder->AddSubjectSlice(match_to, subject_length);
}
break;
}
case SUBJECT_CAPTURE: {
int capture = part.data;
FixedArray* match_info = FixedArray::cast(last_match_info->elements());
int from = RegExpImpl::GetCapture(match_info, capture * 2);
int to = RegExpImpl::GetCapture(match_info, capture * 2 + 1);
if (from >= 0 && to > from) {
builder->AddSubjectSlice(from, to);
}
break;
}
case REPLACEMENT_SUBSTRING:
case REPLACEMENT_STRING:
builder->AddString(replacement_substrings_[part.data]);
break;
default:
UNREACHABLE();
}
}
}
MUST_USE_RESULT static MaybeObject* StringReplaceRegExpWithString(
Isolate* isolate,
String* subject,
JSRegExp* regexp,
String* replacement,
JSArray* last_match_info) {
ASSERT(subject->IsFlat());
ASSERT(replacement->IsFlat());
HandleScope handles(isolate);
int length = subject->length();
Handle<String> subject_handle(subject);
Handle<JSRegExp> regexp_handle(regexp);
Handle<String> replacement_handle(replacement);
Handle<JSArray> last_match_info_handle(last_match_info);
Handle<Object> match = RegExpImpl::Exec(regexp_handle,
subject_handle,
0,
last_match_info_handle);
if (match.is_null()) {
return Failure::Exception();
}
if (match->IsNull()) {
return *subject_handle;
}
int capture_count = regexp_handle->CaptureCount();
// CompiledReplacement uses zone allocation.
CompilationZoneScope zone(DELETE_ON_EXIT);
CompiledReplacement compiled_replacement;
compiled_replacement.Compile(replacement_handle,
capture_count,
length);
bool is_global = regexp_handle->GetFlags().is_global();
// Guessing the number of parts that the final result string is built
// from. Global regexps can match any number of times, so we guess
// conservatively.
int expected_parts =
(compiled_replacement.parts() + 1) * (is_global ? 4 : 1) + 1;
ReplacementStringBuilder builder(isolate->heap(),
subject_handle,
expected_parts);
// Index of end of last match.
int prev = 0;
// Number of parts added by compiled replacement plus preceeding
// string and possibly suffix after last match. It is possible for
// all components to use two elements when encoded as two smis.
const int parts_added_per_loop = 2 * (compiled_replacement.parts() + 2);
bool matched = true;
do {
ASSERT(last_match_info_handle->HasFastElements());
// Increase the capacity of the builder before entering local handle-scope,
// so its internal buffer can safely allocate a new handle if it grows.
builder.EnsureCapacity(parts_added_per_loop);
HandleScope loop_scope(isolate);
int start, end;
{
AssertNoAllocation match_info_array_is_not_in_a_handle;
FixedArray* match_info_array =
FixedArray::cast(last_match_info_handle->elements());
ASSERT_EQ(capture_count * 2 + 2,
RegExpImpl::GetLastCaptureCount(match_info_array));
start = RegExpImpl::GetCapture(match_info_array, 0);
end = RegExpImpl::GetCapture(match_info_array, 1);
}
if (prev < start) {
builder.AddSubjectSlice(prev, start);
}
compiled_replacement.Apply(&builder,
start,
end,
last_match_info_handle);
prev = end;
// Only continue checking for global regexps.
if (!is_global) break;
// Continue from where the match ended, unless it was an empty match.
int next = end;
if (start == end) {
next = end + 1;
if (next > length) break;
}
match = RegExpImpl::Exec(regexp_handle,
subject_handle,
next,
last_match_info_handle);
if (match.is_null()) {
return Failure::Exception();
}
matched = !match->IsNull();
} while (matched);
if (prev < length) {
builder.AddSubjectSlice(prev, length);
}
return *(builder.ToString());
}
template <typename ResultSeqString>
MUST_USE_RESULT static MaybeObject* StringReplaceRegExpWithEmptyString(
Isolate* isolate,
String* subject,
JSRegExp* regexp,
JSArray* last_match_info) {
ASSERT(subject->IsFlat());
HandleScope handles(isolate);
Handle<String> subject_handle(subject);
Handle<JSRegExp> regexp_handle(regexp);
Handle<JSArray> last_match_info_handle(last_match_info);
Handle<Object> match = RegExpImpl::Exec(regexp_handle,
subject_handle,
0,
last_match_info_handle);
if (match.is_null()) return Failure::Exception();
if (match->IsNull()) return *subject_handle;
ASSERT(last_match_info_handle->HasFastElements());
int start, end;
{
AssertNoAllocation match_info_array_is_not_in_a_handle;
FixedArray* match_info_array =
FixedArray::cast(last_match_info_handle->elements());
start = RegExpImpl::GetCapture(match_info_array, 0);
end = RegExpImpl::GetCapture(match_info_array, 1);
}
int length = subject_handle->length();
int new_length = length - (end - start);
if (new_length == 0) {
return isolate->heap()->empty_string();
}
Handle<ResultSeqString> answer;
if (ResultSeqString::kHasAsciiEncoding) {
answer = Handle<ResultSeqString>::cast(
isolate->factory()->NewRawAsciiString(new_length));
} else {
answer = Handle<ResultSeqString>::cast(
isolate->factory()->NewRawTwoByteString(new_length));
}
// If the regexp isn't global, only match once.
if (!regexp_handle->GetFlags().is_global()) {
if (start > 0) {
String::WriteToFlat(*subject_handle,
answer->GetChars(),
0,
start);
}
if (end < length) {
String::WriteToFlat(*subject_handle,
answer->GetChars() + start,
end,
length);
}
return *answer;
}
int prev = 0; // Index of end of last match.
int next = 0; // Start of next search (prev unless last match was empty).
int position = 0;
do {
if (prev < start) {
// Add substring subject[prev;start] to answer string.
String::WriteToFlat(*subject_handle,
answer->GetChars() + position,
prev,
start);
position += start - prev;
}
prev = end;
next = end;
// Continue from where the match ended, unless it was an empty match.
if (start == end) {
next++;
if (next > length) break;
}
match = RegExpImpl::Exec(regexp_handle,
subject_handle,
next,
last_match_info_handle);
if (match.is_null()) return Failure::Exception();
if (match->IsNull()) break;
ASSERT(last_match_info_handle->HasFastElements());
HandleScope loop_scope(isolate);
{
AssertNoAllocation match_info_array_is_not_in_a_handle;
FixedArray* match_info_array =
FixedArray::cast(last_match_info_handle->elements());
start = RegExpImpl::GetCapture(match_info_array, 0);
end = RegExpImpl::GetCapture(match_info_array, 1);
}
} while (true);
if (prev < length) {
// Add substring subject[prev;length] to answer string.
String::WriteToFlat(*subject_handle,
answer->GetChars() + position,
prev,
length);
position += length - prev;
}
if (position == 0) {
return isolate->heap()->empty_string();
}
// Shorten string and fill
int string_size = ResultSeqString::SizeFor(position);
int allocated_string_size = ResultSeqString::SizeFor(new_length);
int delta = allocated_string_size - string_size;
answer->set_length(position);
if (delta == 0) return *answer;
Address end_of_string = answer->address() + string_size;
isolate->heap()->CreateFillerObjectAt(end_of_string, delta);
return *answer;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringReplaceRegExpWithString) {
ASSERT(args.length() == 4);
CONVERT_CHECKED(String, subject, args[0]);
if (!subject->IsFlat()) {
Object* flat_subject;
{ MaybeObject* maybe_flat_subject = subject->TryFlatten();
if (!maybe_flat_subject->ToObject(&flat_subject)) {
return maybe_flat_subject;
}
}
subject = String::cast(flat_subject);
}
CONVERT_CHECKED(String, replacement, args[2]);
if (!replacement->IsFlat()) {
Object* flat_replacement;
{ MaybeObject* maybe_flat_replacement = replacement->TryFlatten();
if (!maybe_flat_replacement->ToObject(&flat_replacement)) {
return maybe_flat_replacement;
}
}
replacement = String::cast(flat_replacement);
}
CONVERT_CHECKED(JSRegExp, regexp, args[1]);
CONVERT_CHECKED(JSArray, last_match_info, args[3]);
ASSERT(last_match_info->HasFastElements());
if (replacement->length() == 0) {
if (subject->HasOnlyAsciiChars()) {
return StringReplaceRegExpWithEmptyString<SeqAsciiString>(
isolate, subject, regexp, last_match_info);
} else {
return StringReplaceRegExpWithEmptyString<SeqTwoByteString>(
isolate, subject, regexp, last_match_info);
}
}
return StringReplaceRegExpWithString(isolate,
subject,
regexp,
replacement,
last_match_info);
}
// Perform string match of pattern on subject, starting at start index.
// Caller must ensure that 0 <= start_index <= sub->length(),
// and should check that pat->length() + start_index <= sub->length().
int Runtime::StringMatch(Isolate* isolate,
Handle<String> sub,
Handle<String> pat,
int start_index) {
ASSERT(0 <= start_index);
ASSERT(start_index <= sub->length());
int pattern_length = pat->length();
if (pattern_length == 0) return start_index;
int subject_length = sub->length();
if (start_index + pattern_length > subject_length) return -1;
if (!sub->IsFlat()) FlattenString(sub);
if (!pat->IsFlat()) FlattenString(pat);
AssertNoAllocation no_heap_allocation; // ensure vectors stay valid
// Extract flattened substrings of cons strings before determining asciiness.
String* seq_sub = *sub;
if (seq_sub->IsConsString()) seq_sub = ConsString::cast(seq_sub)->first();
String* seq_pat = *pat;
if (seq_pat->IsConsString()) seq_pat = ConsString::cast(seq_pat)->first();
// dispatch on type of strings
if (seq_pat->IsAsciiRepresentation()) {
Vector<const char> pat_vector = seq_pat->ToAsciiVector();
if (seq_sub->IsAsciiRepresentation()) {
return SearchString(isolate,
seq_sub->ToAsciiVector(),
pat_vector,
start_index);
}
return SearchString(isolate,
seq_sub->ToUC16Vector(),
pat_vector,
start_index);
}
Vector<const uc16> pat_vector = seq_pat->ToUC16Vector();
if (seq_sub->IsAsciiRepresentation()) {
return SearchString(isolate,
seq_sub->ToAsciiVector(),
pat_vector,
start_index);
}
return SearchString(isolate,
seq_sub->ToUC16Vector(),
pat_vector,
start_index);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringIndexOf) {
HandleScope scope(isolate); // create a new handle scope
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(String, sub, 0);
CONVERT_ARG_CHECKED(String, pat, 1);
Object* index = args[2];
uint32_t start_index;
if (!index->ToArrayIndex(&start_index)) return Smi::FromInt(-1);
RUNTIME_ASSERT(start_index <= static_cast<uint32_t>(sub->length()));
int position =
Runtime::StringMatch(isolate, sub, pat, start_index);
return Smi::FromInt(position);
}
template <typename schar, typename pchar>
static int StringMatchBackwards(Vector<const schar> subject,
Vector<const pchar> pattern,
int idx) {
int pattern_length = pattern.length();
ASSERT(pattern_length >= 1);
ASSERT(idx + pattern_length <= subject.length());
if (sizeof(schar) == 1 && sizeof(pchar) > 1) {
for (int i = 0; i < pattern_length; i++) {
uc16 c = pattern[i];
if (c > String::kMaxAsciiCharCode) {
return -1;
}
}
}
pchar pattern_first_char = pattern[0];
for (int i = idx; i >= 0; i--) {
if (subject[i] != pattern_first_char) continue;
int j = 1;
while (j < pattern_length) {
if (pattern[j] != subject[i+j]) {
break;
}
j++;
}
if (j == pattern_length) {
return i;
}
}
return -1;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringLastIndexOf) {
HandleScope scope(isolate); // create a new handle scope
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(String, sub, 0);
CONVERT_ARG_CHECKED(String, pat, 1);
Object* index = args[2];
uint32_t start_index;
if (!index->ToArrayIndex(&start_index)) return Smi::FromInt(-1);
uint32_t pat_length = pat->length();
uint32_t sub_length = sub->length();
if (start_index + pat_length > sub_length) {
start_index = sub_length - pat_length;
}
if (pat_length == 0) {
return Smi::FromInt(start_index);
}
if (!sub->IsFlat()) FlattenString(sub);
if (!pat->IsFlat()) FlattenString(pat);
AssertNoAllocation no_heap_allocation; // ensure vectors stay valid
int position = -1;
if (pat->IsAsciiRepresentation()) {
Vector<const char> pat_vector = pat->ToAsciiVector();
if (sub->IsAsciiRepresentation()) {
position = StringMatchBackwards(sub->ToAsciiVector(),
pat_vector,
start_index);
} else {
position = StringMatchBackwards(sub->ToUC16Vector(),
pat_vector,
start_index);
}
} else {
Vector<const uc16> pat_vector = pat->ToUC16Vector();
if (sub->IsAsciiRepresentation()) {
position = StringMatchBackwards(sub->ToAsciiVector(),
pat_vector,
start_index);
} else {
position = StringMatchBackwards(sub->ToUC16Vector(),
pat_vector,
start_index);
}
}
return Smi::FromInt(position);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringLocaleCompare) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, str1, args[0]);
CONVERT_CHECKED(String, str2, args[1]);
if (str1 == str2) return Smi::FromInt(0); // Equal.
int str1_length = str1->length();
int str2_length = str2->length();
// Decide trivial cases without flattening.
if (str1_length == 0) {
if (str2_length == 0) return Smi::FromInt(0); // Equal.
return Smi::FromInt(-str2_length);
} else {
if (str2_length == 0) return Smi::FromInt(str1_length);
}
int end = str1_length < str2_length ? str1_length : str2_length;
// No need to flatten if we are going to find the answer on the first
// character. At this point we know there is at least one character
// in each string, due to the trivial case handling above.
int d = str1->Get(0) - str2->Get(0);
if (d != 0) return Smi::FromInt(d);
str1->TryFlatten();
str2->TryFlatten();
StringInputBuffer& buf1 =
*isolate->runtime_state()->string_locale_compare_buf1();
StringInputBuffer& buf2 =
*isolate->runtime_state()->string_locale_compare_buf2();
buf1.Reset(str1);
buf2.Reset(str2);
for (int i = 0; i < end; i++) {
uint16_t char1 = buf1.GetNext();
uint16_t char2 = buf2.GetNext();
if (char1 != char2) return Smi::FromInt(char1 - char2);
}
return Smi::FromInt(str1_length - str2_length);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SubString) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_CHECKED(String, value, args[0]);
Object* from = args[1];
Object* to = args[2];
int start, end;
// We have a fast integer-only case here to avoid a conversion to double in
// the common case where from and to are Smis.
if (from->IsSmi() && to->IsSmi()) {
start = Smi::cast(from)->value();
end = Smi::cast(to)->value();
} else {
CONVERT_DOUBLE_CHECKED(from_number, from);
CONVERT_DOUBLE_CHECKED(to_number, to);
start = FastD2I(from_number);
end = FastD2I(to_number);
}
RUNTIME_ASSERT(end >= start);
RUNTIME_ASSERT(start >= 0);
RUNTIME_ASSERT(end <= value->length());
isolate->counters()->sub_string_runtime()->Increment();
return value->SubString(start, end);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringMatch) {
ASSERT_EQ(3, args.length());
CONVERT_ARG_CHECKED(String, subject, 0);
CONVERT_ARG_CHECKED(JSRegExp, regexp, 1);
CONVERT_ARG_CHECKED(JSArray, regexp_info, 2);
HandleScope handles;
Handle<Object> match = RegExpImpl::Exec(regexp, subject, 0, regexp_info);
if (match.is_null()) {
return Failure::Exception();
}
if (match->IsNull()) {
return isolate->heap()->null_value();
}
int length = subject->length();
CompilationZoneScope zone_space(DELETE_ON_EXIT);
ZoneList<int> offsets(8);
do {
int start;
int end;
{
AssertNoAllocation no_alloc;
FixedArray* elements = FixedArray::cast(regexp_info->elements());
start = Smi::cast(elements->get(RegExpImpl::kFirstCapture))->value();
end = Smi::cast(elements->get(RegExpImpl::kFirstCapture + 1))->value();
}
offsets.Add(start);
offsets.Add(end);
int index = start < end ? end : end + 1;
if (index > length) break;
match = RegExpImpl::Exec(regexp, subject, index, regexp_info);
if (match.is_null()) {
return Failure::Exception();
}
} while (!match->IsNull());
int matches = offsets.length() / 2;
Handle<FixedArray> elements = isolate->factory()->NewFixedArray(matches);
for (int i = 0; i < matches ; i++) {
int from = offsets.at(i * 2);
int to = offsets.at(i * 2 + 1);
Handle<String> match = isolate->factory()->NewSubString(subject, from, to);
elements->set(i, *match);
}
Handle<JSArray> result = isolate->factory()->NewJSArrayWithElements(elements);
result->set_length(Smi::FromInt(matches));
return *result;
}
// Two smis before and after the match, for very long strings.
const int kMaxBuilderEntriesPerRegExpMatch = 5;
static void SetLastMatchInfoNoCaptures(Handle<String> subject,
Handle<JSArray> last_match_info,
int match_start,
int match_end) {
// Fill last_match_info with a single capture.
last_match_info->EnsureSize(2 + RegExpImpl::kLastMatchOverhead);
AssertNoAllocation no_gc;
FixedArray* elements = FixedArray::cast(last_match_info->elements());
RegExpImpl::SetLastCaptureCount(elements, 2);
RegExpImpl::SetLastInput(elements, *subject);
RegExpImpl::SetLastSubject(elements, *subject);
RegExpImpl::SetCapture(elements, 0, match_start);
RegExpImpl::SetCapture(elements, 1, match_end);
}
template <typename SubjectChar, typename PatternChar>
static bool SearchStringMultiple(Isolate* isolate,
Vector<const SubjectChar> subject,
Vector<const PatternChar> pattern,
String* pattern_string,
FixedArrayBuilder* builder,
int* match_pos) {
int pos = *match_pos;
int subject_length = subject.length();
int pattern_length = pattern.length();
int max_search_start = subject_length - pattern_length;
StringSearch<PatternChar, SubjectChar> search(isolate, pattern);
while (pos <= max_search_start) {
if (!builder->HasCapacity(kMaxBuilderEntriesPerRegExpMatch)) {
*match_pos = pos;
return false;
}
// Position of end of previous match.
int match_end = pos + pattern_length;
int new_pos = search.Search(subject, match_end);
if (new_pos >= 0) {
// A match.
if (new_pos > match_end) {
ReplacementStringBuilder::AddSubjectSlice(builder,
match_end,
new_pos);
}
pos = new_pos;
builder->Add(pattern_string);
} else {
break;
}
}
if (pos < max_search_start) {
ReplacementStringBuilder::AddSubjectSlice(builder,
pos + pattern_length,
subject_length);
}
*match_pos = pos;
return true;
}
static bool SearchStringMultiple(Isolate* isolate,
Handle<String> subject,
Handle<String> pattern,
Handle<JSArray> last_match_info,
FixedArrayBuilder* builder) {
ASSERT(subject->IsFlat());
ASSERT(pattern->IsFlat());
// Treating as if a previous match was before first character.
int match_pos = -pattern->length();
for (;;) { // Break when search complete.
builder->EnsureCapacity(kMaxBuilderEntriesPerRegExpMatch);
AssertNoAllocation no_gc;
if (subject->IsAsciiRepresentation()) {
Vector<const char> subject_vector = subject->ToAsciiVector();
if (pattern->IsAsciiRepresentation()) {
if (SearchStringMultiple(isolate,
subject_vector,
pattern->ToAsciiVector(),
*pattern,
builder,
&match_pos)) break;
} else {
if (SearchStringMultiple(isolate,
subject_vector,
pattern->ToUC16Vector(),
*pattern,
builder,
&match_pos)) break;
}
} else {
Vector<const uc16> subject_vector = subject->ToUC16Vector();
if (pattern->IsAsciiRepresentation()) {
if (SearchStringMultiple(isolate,
subject_vector,
pattern->ToAsciiVector(),
*pattern,
builder,
&match_pos)) break;
} else {
if (SearchStringMultiple(isolate,
subject_vector,
pattern->ToUC16Vector(),
*pattern,
builder,
&match_pos)) break;
}
}
}
if (match_pos >= 0) {
SetLastMatchInfoNoCaptures(subject,
last_match_info,
match_pos,
match_pos + pattern->length());
return true;
}
return false; // No matches at all.
}
static RegExpImpl::IrregexpResult SearchRegExpNoCaptureMultiple(
Isolate* isolate,
Handle<String> subject,
Handle<JSRegExp> regexp,
Handle<JSArray> last_match_array,
FixedArrayBuilder* builder) {
ASSERT(subject->IsFlat());
int match_start = -1;
int match_end = 0;
int pos = 0;
int required_registers = RegExpImpl::IrregexpPrepare(regexp, subject);
if (required_registers < 0) return RegExpImpl::RE_EXCEPTION;
OffsetsVector registers(required_registers);
Vector<int32_t> register_vector(registers.vector(), registers.length());
int subject_length = subject->length();
for (;;) { // Break on failure, return on exception.
RegExpImpl::IrregexpResult result =
RegExpImpl::IrregexpExecOnce(regexp,
subject,
pos,
register_vector);
if (result == RegExpImpl::RE_SUCCESS) {
match_start = register_vector[0];
builder->EnsureCapacity(kMaxBuilderEntriesPerRegExpMatch);
if (match_end < match_start) {
ReplacementStringBuilder::AddSubjectSlice(builder,
match_end,
match_start);
}
match_end = register_vector[1];
HandleScope loop_scope(isolate);
builder->Add(*isolate->factory()->NewSubString(subject,
match_start,
match_end));
if (match_start != match_end) {
pos = match_end;
} else {
pos = match_end + 1;
if (pos > subject_length) break;
}
} else if (result == RegExpImpl::RE_FAILURE) {
break;
} else {
ASSERT_EQ(result, RegExpImpl::RE_EXCEPTION);
return result;
}
}
if (match_start >= 0) {
if (match_end < subject_length) {
ReplacementStringBuilder::AddSubjectSlice(builder,
match_end,
subject_length);
}
SetLastMatchInfoNoCaptures(subject,
last_match_array,
match_start,
match_end);
return RegExpImpl::RE_SUCCESS;
} else {
return RegExpImpl::RE_FAILURE; // No matches at all.
}
}
static RegExpImpl::IrregexpResult SearchRegExpMultiple(
Isolate* isolate,
Handle<String> subject,
Handle<JSRegExp> regexp,
Handle<JSArray> last_match_array,
FixedArrayBuilder* builder) {
ASSERT(subject->IsFlat());
int required_registers = RegExpImpl::IrregexpPrepare(regexp, subject);
if (required_registers < 0) return RegExpImpl::RE_EXCEPTION;
OffsetsVector registers(required_registers);
Vector<int32_t> register_vector(registers.vector(), registers.length());
RegExpImpl::IrregexpResult result =
RegExpImpl::IrregexpExecOnce(regexp,
subject,
0,
register_vector);
int capture_count = regexp->CaptureCount();
int subject_length = subject->length();
// Position to search from.
int pos = 0;
// End of previous match. Differs from pos if match was empty.
int match_end = 0;
if (result == RegExpImpl::RE_SUCCESS) {
// Need to keep a copy of the previous match for creating last_match_info
// at the end, so we have two vectors that we swap between.
OffsetsVector registers2(required_registers);
Vector<int> prev_register_vector(registers2.vector(), registers2.length());
do {
int match_start = register_vector[0];
builder->EnsureCapacity(kMaxBuilderEntriesPerRegExpMatch);
if (match_end < match_start) {
ReplacementStringBuilder::AddSubjectSlice(builder,
match_end,
match_start);
}
match_end = register_vector[1];
{
// Avoid accumulating new handles inside loop.
HandleScope temp_scope(isolate);
// Arguments array to replace function is match, captures, index and
// subject, i.e., 3 + capture count in total.
Handle<FixedArray> elements =
isolate->factory()->NewFixedArray(3 + capture_count);
Handle<String> match = isolate->factory()->NewSubString(subject,
match_start,
match_end);
elements->set(0, *match);
for (int i = 1; i <= capture_count; i++) {
int start = register_vector[i * 2];
if (start >= 0) {
int end = register_vector[i * 2 + 1];
ASSERT(start <= end);
Handle<String> substring = isolate->factory()->NewSubString(subject,
start,
end);
elements->set(i, *substring);
} else {
ASSERT(register_vector[i * 2 + 1] < 0);
elements->set(i, isolate->heap()->undefined_value());
}
}
elements->set(capture_count + 1, Smi::FromInt(match_start));
elements->set(capture_count + 2, *subject);
builder->Add(*isolate->factory()->NewJSArrayWithElements(elements));
}
// Swap register vectors, so the last successful match is in
// prev_register_vector.
Vector<int32_t> tmp = prev_register_vector;
prev_register_vector = register_vector;
register_vector = tmp;
if (match_end > match_start) {
pos = match_end;
} else {
pos = match_end + 1;
if (pos > subject_length) {
break;
}
}
result = RegExpImpl::IrregexpExecOnce(regexp,
subject,
pos,
register_vector);
} while (result == RegExpImpl::RE_SUCCESS);
if (result != RegExpImpl::RE_EXCEPTION) {
// Finished matching, with at least one match.
if (match_end < subject_length) {
ReplacementStringBuilder::AddSubjectSlice(builder,
match_end,
subject_length);
}
int last_match_capture_count = (capture_count + 1) * 2;
int last_match_array_size =
last_match_capture_count + RegExpImpl::kLastMatchOverhead;
last_match_array->EnsureSize(last_match_array_size);
AssertNoAllocation no_gc;
FixedArray* elements = FixedArray::cast(last_match_array->elements());
RegExpImpl::SetLastCaptureCount(elements, last_match_capture_count);
RegExpImpl::SetLastSubject(elements, *subject);
RegExpImpl::SetLastInput(elements, *subject);
for (int i = 0; i < last_match_capture_count; i++) {
RegExpImpl::SetCapture(elements, i, prev_register_vector[i]);
}
return RegExpImpl::RE_SUCCESS;
}
}
// No matches at all, return failure or exception result directly.
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RegExpExecMultiple) {
ASSERT(args.length() == 4);
HandleScope handles(isolate);
CONVERT_ARG_CHECKED(String, subject, 1);
if (!subject->IsFlat()) { FlattenString(subject); }
CONVERT_ARG_CHECKED(JSRegExp, regexp, 0);
CONVERT_ARG_CHECKED(JSArray, last_match_info, 2);
CONVERT_ARG_CHECKED(JSArray, result_array, 3);
ASSERT(last_match_info->HasFastElements());
ASSERT(regexp->GetFlags().is_global());
Handle<FixedArray> result_elements;
if (result_array->HasFastElements()) {
result_elements =
Handle<FixedArray>(FixedArray::cast(result_array->elements()));
} else {
result_elements = isolate->factory()->NewFixedArrayWithHoles(16);
}
FixedArrayBuilder builder(result_elements);
if (regexp->TypeTag() == JSRegExp::ATOM) {
Handle<String> pattern(
String::cast(regexp->DataAt(JSRegExp::kAtomPatternIndex)));
ASSERT(pattern->IsFlat());
if (SearchStringMultiple(isolate, subject, pattern,
last_match_info, &builder)) {
return *builder.ToJSArray(result_array);
}
return isolate->heap()->null_value();
}
ASSERT_EQ(regexp->TypeTag(), JSRegExp::IRREGEXP);
RegExpImpl::IrregexpResult result;
if (regexp->CaptureCount() == 0) {
result = SearchRegExpNoCaptureMultiple(isolate,
subject,
regexp,
last_match_info,
&builder);
} else {
result = SearchRegExpMultiple(isolate,
subject,
regexp,
last_match_info,
&builder);
}
if (result == RegExpImpl::RE_SUCCESS) return *builder.ToJSArray(result_array);
if (result == RegExpImpl::RE_FAILURE) return isolate->heap()->null_value();
ASSERT_EQ(result, RegExpImpl::RE_EXCEPTION);
return Failure::Exception();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToRadixString) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
// Fast case where the result is a one character string.
if (args[0]->IsSmi() && args[1]->IsSmi()) {
int value = Smi::cast(args[0])->value();
int radix = Smi::cast(args[1])->value();
if (value >= 0 && value < radix) {
RUNTIME_ASSERT(radix <= 36);
// Character array used for conversion.
static const char kCharTable[] = "0123456789abcdefghijklmnopqrstuvwxyz";
return isolate->heap()->
LookupSingleCharacterStringFromCode(kCharTable[value]);
}
}
// Slow case.
CONVERT_DOUBLE_CHECKED(value, args[0]);
if (isnan(value)) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("NaN"));
}
if (isinf(value)) {
if (value < 0) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("-Infinity"));
}
return isolate->heap()->AllocateStringFromAscii(CStrVector("Infinity"));
}
CONVERT_DOUBLE_CHECKED(radix_number, args[1]);
int radix = FastD2I(radix_number);
RUNTIME_ASSERT(2 <= radix && radix <= 36);
char* str = DoubleToRadixCString(value, radix);
MaybeObject* result =
isolate->heap()->AllocateStringFromAscii(CStrVector(str));
DeleteArray(str);
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToFixed) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(value, args[0]);
if (isnan(value)) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("NaN"));
}
if (isinf(value)) {
if (value < 0) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("-Infinity"));
}
return isolate->heap()->AllocateStringFromAscii(CStrVector("Infinity"));
}
CONVERT_DOUBLE_CHECKED(f_number, args[1]);
int f = FastD2I(f_number);
RUNTIME_ASSERT(f >= 0);
char* str = DoubleToFixedCString(value, f);
MaybeObject* res =
isolate->heap()->AllocateStringFromAscii(CStrVector(str));
DeleteArray(str);
return res;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToExponential) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(value, args[0]);
if (isnan(value)) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("NaN"));
}
if (isinf(value)) {
if (value < 0) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("-Infinity"));
}
return isolate->heap()->AllocateStringFromAscii(CStrVector("Infinity"));
}
CONVERT_DOUBLE_CHECKED(f_number, args[1]);
int f = FastD2I(f_number);
RUNTIME_ASSERT(f >= -1 && f <= 20);
char* str = DoubleToExponentialCString(value, f);
MaybeObject* res =
isolate->heap()->AllocateStringFromAscii(CStrVector(str));
DeleteArray(str);
return res;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToPrecision) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(value, args[0]);
if (isnan(value)) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("NaN"));
}
if (isinf(value)) {
if (value < 0) {
return isolate->heap()->AllocateStringFromAscii(CStrVector("-Infinity"));
}
return isolate->heap()->AllocateStringFromAscii(CStrVector("Infinity"));
}
CONVERT_DOUBLE_CHECKED(f_number, args[1]);
int f = FastD2I(f_number);
RUNTIME_ASSERT(f >= 1 && f <= 21);
char* str = DoubleToPrecisionCString(value, f);
MaybeObject* res =
isolate->heap()->AllocateStringFromAscii(CStrVector(str));
DeleteArray(str);
return res;
}
// Returns a single character string where first character equals
// string->Get(index).
static Handle<Object> GetCharAt(Handle<String> string, uint32_t index) {
if (index < static_cast<uint32_t>(string->length())) {
string->TryFlatten();
return LookupSingleCharacterStringFromCode(
string->Get(index));
}
return Execution::CharAt(string, index);
}
MaybeObject* Runtime::GetElementOrCharAt(Isolate* isolate,
Handle<Object> object,
uint32_t index) {
// Handle [] indexing on Strings
if (object->IsString()) {
Handle<Object> result = GetCharAt(Handle<String>::cast(object), index);
if (!result->IsUndefined()) return *result;
}
// Handle [] indexing on String objects
if (object->IsStringObjectWithCharacterAt(index)) {
Handle<JSValue> js_value = Handle<JSValue>::cast(object);
Handle<Object> result =
GetCharAt(Handle<String>(String::cast(js_value->value())), index);
if (!result->IsUndefined()) return *result;
}
if (object->IsString() || object->IsNumber() || object->IsBoolean()) {
Handle<Object> prototype = GetPrototype(object);
return prototype->GetElement(index);
}
return GetElement(object, index);
}
MaybeObject* Runtime::GetElement(Handle<Object> object, uint32_t index) {
return object->GetElement(index);
}
MaybeObject* Runtime::GetObjectProperty(Isolate* isolate,
Handle<Object> object,
Handle<Object> key) {
HandleScope scope(isolate);
if (object->IsUndefined() || object->IsNull()) {
Handle<Object> args[2] = { key, object };
Handle<Object> error =
isolate->factory()->NewTypeError("non_object_property_load",
HandleVector(args, 2));
return isolate->Throw(*error);
}
// Check if the given key is an array index.
uint32_t index;
if (key->ToArrayIndex(&index)) {
return GetElementOrCharAt(isolate, object, index);
}
// Convert the key to a string - possibly by calling back into JavaScript.
Handle<String> name;
if (key->IsString()) {
name = Handle<String>::cast(key);
} else {
bool has_pending_exception = false;
Handle<Object> converted =
Execution::ToString(key, &has_pending_exception);
if (has_pending_exception) return Failure::Exception();
name = Handle<String>::cast(converted);
}
// Check if the name is trivially convertible to an index and get
// the element if so.
if (name->AsArrayIndex(&index)) {
return GetElementOrCharAt(isolate, object, index);
} else {
PropertyAttributes attr;
return object->GetProperty(*name, &attr);
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetProperty) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
return Runtime::GetObjectProperty(isolate, object, key);
}
// KeyedStringGetProperty is called from KeyedLoadIC::GenerateGeneric.
RUNTIME_FUNCTION(MaybeObject*, Runtime_KeyedGetProperty) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
// Fast cases for getting named properties of the receiver JSObject
// itself.
//
// The global proxy objects has to be excluded since LocalLookup on
// the global proxy object can return a valid result even though the
// global proxy object never has properties. This is the case
// because the global proxy object forwards everything to its hidden
// prototype including local lookups.
//
// Additionally, we need to make sure that we do not cache results
// for objects that require access checks.
if (args[0]->IsJSObject() &&
!args[0]->IsJSGlobalProxy() &&
!args[0]->IsAccessCheckNeeded() &&
args[1]->IsString()) {
JSObject* receiver = JSObject::cast(args[0]);
String* key = String::cast(args[1]);
if (receiver->HasFastProperties()) {
// Attempt to use lookup cache.
Map* receiver_map = receiver->map();
KeyedLookupCache* keyed_lookup_cache = isolate->keyed_lookup_cache();
int offset = keyed_lookup_cache->Lookup(receiver_map, key);
if (offset != -1) {
Object* value = receiver->FastPropertyAt(offset);
return value->IsTheHole() ? isolate->heap()->undefined_value() : value;
}
// Lookup cache miss. Perform lookup and update the cache if appropriate.
LookupResult result;
receiver->LocalLookup(key, &result);
if (result.IsProperty() && result.type() == FIELD) {
int offset = result.GetFieldIndex();
keyed_lookup_cache->Update(receiver_map, key, offset);
return receiver->FastPropertyAt(offset);
}
} else {
// Attempt dictionary lookup.
StringDictionary* dictionary = receiver->property_dictionary();
int entry = dictionary->FindEntry(key);
if ((entry != StringDictionary::kNotFound) &&
(dictionary->DetailsAt(entry).type() == NORMAL)) {
Object* value = dictionary->ValueAt(entry);
if (!receiver->IsGlobalObject()) return value;
value = JSGlobalPropertyCell::cast(value)->value();
if (!value->IsTheHole()) return value;
// If value is the hole do the general lookup.
}
}
} else if (args[0]->IsString() && args[1]->IsSmi()) {
// Fast case for string indexing using [] with a smi index.
HandleScope scope(isolate);
Handle<String> str = args.at<String>(0);
int index = Smi::cast(args[1])->value();
if (index >= 0 && index < str->length()) {
Handle<Object> result = GetCharAt(str, index);
return *result;
}
}
// Fall back to GetObjectProperty.
return Runtime::GetObjectProperty(isolate,
args.at<Object>(0),
args.at<Object>(1));
}
// Implements part of 8.12.9 DefineOwnProperty.
// There are 3 cases that lead here:
// Step 4b - define a new accessor property.
// Steps 9c & 12 - replace an existing data property with an accessor property.
// Step 12 - update an existing accessor property with an accessor or generic
// descriptor.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineOrRedefineAccessorProperty) {
ASSERT(args.length() == 5);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
CONVERT_CHECKED(String, name, args[1]);
CONVERT_CHECKED(Smi, flag_setter, args[2]);
Object* fun = args[3];
RUNTIME_ASSERT(fun->IsJSFunction() || fun->IsUndefined());
CONVERT_CHECKED(Smi, flag_attr, args[4]);
int unchecked = flag_attr->value();
RUNTIME_ASSERT((unchecked & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
RUNTIME_ASSERT(!obj->IsNull());
LookupResult result;
obj->LocalLookupRealNamedProperty(name, &result);
PropertyAttributes attr = static_cast<PropertyAttributes>(unchecked);
// If an existing property is either FIELD, NORMAL or CONSTANT_FUNCTION
// delete it to avoid running into trouble in DefineAccessor, which
// handles this incorrectly if the property is readonly (does nothing)
if (result.IsProperty() &&
(result.type() == FIELD || result.type() == NORMAL
|| result.type() == CONSTANT_FUNCTION)) {
Object* ok;
{ MaybeObject* maybe_ok =
obj->DeleteProperty(name, JSObject::NORMAL_DELETION);
if (!maybe_ok->ToObject(&ok)) return maybe_ok;
}
}
return obj->DefineAccessor(name, flag_setter->value() == 0, fun, attr);
}
// Implements part of 8.12.9 DefineOwnProperty.
// There are 3 cases that lead here:
// Step 4a - define a new data property.
// Steps 9b & 12 - replace an existing accessor property with a data property.
// Step 12 - update an existing data property with a data or generic
// descriptor.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineOrRedefineDataProperty) {
ASSERT(args.length() == 4);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSObject, js_object, 0);
CONVERT_ARG_CHECKED(String, name, 1);
Handle<Object> obj_value = args.at<Object>(2);
CONVERT_CHECKED(Smi, flag, args[3]);
int unchecked = flag->value();
RUNTIME_ASSERT((unchecked & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
PropertyAttributes attr = static_cast<PropertyAttributes>(unchecked);
// Check if this is an element.
uint32_t index;
bool is_element = name->AsArrayIndex(&index);
// Special case for elements if any of the flags are true.
// If elements are in fast case we always implicitly assume that:
// DONT_DELETE: false, DONT_ENUM: false, READ_ONLY: false.
if (((unchecked & (DONT_DELETE | DONT_ENUM | READ_ONLY)) != 0) &&
is_element) {
// Normalize the elements to enable attributes on the property.
if (js_object->IsJSGlobalProxy()) {
// We do not need to do access checks here since these has already
// been performed by the call to GetOwnProperty.
Handle<Object> proto(js_object->GetPrototype());
// If proxy is detached, ignore the assignment. Alternatively,
// we could throw an exception.
if (proto->IsNull()) return *obj_value;
js_object = Handle<JSObject>::cast(proto);
}
NormalizeElements(js_object);
Handle<NumberDictionary> dictionary(js_object->element_dictionary());
// Make sure that we never go back to fast case.
dictionary->set_requires_slow_elements();
PropertyDetails details = PropertyDetails(attr, NORMAL);
NumberDictionarySet(dictionary, index, obj_value, details);
return *obj_value;
}
LookupResult result;
js_object->LookupRealNamedProperty(*name, &result);
// To be compatible with safari we do not change the value on API objects
// in defineProperty. Firefox disagrees here, and actually changes the value.
if (result.IsProperty() &&
(result.type() == CALLBACKS) &&
result.GetCallbackObject()->IsAccessorInfo()) {
return isolate->heap()->undefined_value();
}
// Take special care when attributes are different and there is already
// a property. For simplicity we normalize the property which enables us
// to not worry about changing the instance_descriptor and creating a new
// map. The current version of SetObjectProperty does not handle attributes
// correctly in the case where a property is a field and is reset with
// new attributes.
if (result.IsProperty() &&
(attr != result.GetAttributes() || result.type() == CALLBACKS)) {
// New attributes - normalize to avoid writing to instance descriptor
if (js_object->IsJSGlobalProxy()) {
// Since the result is a property, the prototype will exist so
// we don't have to check for null.
js_object = Handle<JSObject>(JSObject::cast(js_object->GetPrototype()));
}
NormalizeProperties(js_object, CLEAR_INOBJECT_PROPERTIES, 0);
// Use IgnoreAttributes version since a readonly property may be
// overridden and SetProperty does not allow this.
return js_object->SetLocalPropertyIgnoreAttributes(*name,
*obj_value,
attr);
}
return Runtime::ForceSetObjectProperty(isolate,
js_object,
name,
obj_value,
attr);
}
MaybeObject* Runtime::SetObjectProperty(Isolate* isolate,
Handle<Object> object,
Handle<Object> key,
Handle<Object> value,
PropertyAttributes attr,
StrictModeFlag strict_mode) {
HandleScope scope(isolate);
if (object->IsUndefined() || object->IsNull()) {
Handle<Object> args[2] = { key, object };
Handle<Object> error =
isolate->factory()->NewTypeError("non_object_property_store",
HandleVector(args, 2));
return isolate->Throw(*error);
}
// If the object isn't a JavaScript object, we ignore the store.
if (!object->IsJSObject()) return *value;
Handle<JSObject> js_object = Handle<JSObject>::cast(object);
// Check if the given key is an array index.
uint32_t index;
if (key->ToArrayIndex(&index)) {
// In Firefox/SpiderMonkey, Safari and Opera you can access the characters
// of a string using [] notation. We need to support this too in
// JavaScript.
// In the case of a String object we just need to redirect the assignment to
// the underlying string if the index is in range. Since the underlying
// string does nothing with the assignment then we can ignore such
// assignments.
if (js_object->IsStringObjectWithCharacterAt(index)) {
return *value;
}
Handle<Object> result = SetElement(js_object, index, value, strict_mode);
if (result.is_null()) return Failure::Exception();
return *value;
}
if (key->IsString()) {
Handle<Object> result;
if (Handle<String>::cast(key)->AsArrayIndex(&index)) {
result = SetElement(js_object, index, value, strict_mode);
} else {
Handle<String> key_string = Handle<String>::cast(key);
key_string->TryFlatten();
result = SetProperty(js_object, key_string, value, attr, strict_mode);
}
if (result.is_null()) return Failure::Exception();
return *value;
}
// Call-back into JavaScript to convert the key to a string.
bool has_pending_exception = false;
Handle<Object> converted = Execution::ToString(key, &has_pending_exception);
if (has_pending_exception) return Failure::Exception();
Handle<String> name = Handle<String>::cast(converted);
if (name->AsArrayIndex(&index)) {
return js_object->SetElement(index, *value, strict_mode);
} else {
return js_object->SetProperty(*name, *value, attr, strict_mode);
}
}
MaybeObject* Runtime::ForceSetObjectProperty(Isolate* isolate,
Handle<JSObject> js_object,
Handle<Object> key,
Handle<Object> value,
PropertyAttributes attr) {
HandleScope scope(isolate);
// Check if the given key is an array index.
uint32_t index;
if (key->ToArrayIndex(&index)) {
// In Firefox/SpiderMonkey, Safari and Opera you can access the characters
// of a string using [] notation. We need to support this too in
// JavaScript.
// In the case of a String object we just need to redirect the assignment to
// the underlying string if the index is in range. Since the underlying
// string does nothing with the assignment then we can ignore such
// assignments.
if (js_object->IsStringObjectWithCharacterAt(index)) {
return *value;
}
return js_object->SetElement(index, *value, kNonStrictMode);
}
if (key->IsString()) {
if (Handle<String>::cast(key)->AsArrayIndex(&index)) {
return js_object->SetElement(index, *value, kNonStrictMode);
} else {
Handle<String> key_string = Handle<String>::cast(key);
key_string->TryFlatten();
return js_object->SetLocalPropertyIgnoreAttributes(*key_string,
*value,
attr);
}
}
// Call-back into JavaScript to convert the key to a string.
bool has_pending_exception = false;
Handle<Object> converted = Execution::ToString(key, &has_pending_exception);
if (has_pending_exception) return Failure::Exception();
Handle<String> name = Handle<String>::cast(converted);
if (name->AsArrayIndex(&index)) {
return js_object->SetElement(index, *value, kNonStrictMode);
} else {
return js_object->SetLocalPropertyIgnoreAttributes(*name, *value, attr);
}
}
MaybeObject* Runtime::ForceDeleteObjectProperty(Isolate* isolate,
Handle<JSObject> js_object,
Handle<Object> key) {
HandleScope scope(isolate);
// Check if the given key is an array index.
uint32_t index;
if (key->ToArrayIndex(&index)) {
// In Firefox/SpiderMonkey, Safari and Opera you can access the
// characters of a string using [] notation. In the case of a
// String object we just need to redirect the deletion to the
// underlying string if the index is in range. Since the
// underlying string does nothing with the deletion, we can ignore
// such deletions.
if (js_object->IsStringObjectWithCharacterAt(index)) {
return isolate->heap()->true_value();
}
return js_object->DeleteElement(index, JSObject::FORCE_DELETION);
}
Handle<String> key_string;
if (key->IsString()) {
key_string = Handle<String>::cast(key);
} else {
// Call-back into JavaScript to convert the key to a string.
bool has_pending_exception = false;
Handle<Object> converted = Execution::ToString(key, &has_pending_exception);
if (has_pending_exception) return Failure::Exception();
key_string = Handle<String>::cast(converted);
}
key_string->TryFlatten();
return js_object->DeleteProperty(*key_string, JSObject::FORCE_DELETION);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetProperty) {
NoHandleAllocation ha;
RUNTIME_ASSERT(args.length() == 4 || args.length() == 5);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
Handle<Object> value = args.at<Object>(2);
CONVERT_SMI_CHECKED(unchecked_attributes, args[3]);
RUNTIME_ASSERT(
(unchecked_attributes & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
// Compute attributes.
PropertyAttributes attributes =
static_cast<PropertyAttributes>(unchecked_attributes);
StrictModeFlag strict_mode = kNonStrictMode;
if (args.length() == 5) {
CONVERT_SMI_CHECKED(strict_unchecked, args[4]);
RUNTIME_ASSERT(strict_unchecked == kStrictMode ||
strict_unchecked == kNonStrictMode);
strict_mode = static_cast<StrictModeFlag>(strict_unchecked);
}
return Runtime::SetObjectProperty(isolate,
object,
key,
value,
attributes,
strict_mode);
}
// Set a local property, even if it is READ_ONLY. If the property does not
// exist, it will be added with attributes NONE.
RUNTIME_FUNCTION(MaybeObject*, Runtime_IgnoreAttributesAndSetProperty) {
NoHandleAllocation ha;
RUNTIME_ASSERT(args.length() == 3 || args.length() == 4);
CONVERT_CHECKED(JSObject, object, args[0]);
CONVERT_CHECKED(String, name, args[1]);
// Compute attributes.
PropertyAttributes attributes = NONE;
if (args.length() == 4) {
CONVERT_CHECKED(Smi, value_obj, args[3]);
int unchecked_value = value_obj->value();
// Only attribute bits should be set.
RUNTIME_ASSERT(
(unchecked_value & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
attributes = static_cast<PropertyAttributes>(unchecked_value);
}
return object->
SetLocalPropertyIgnoreAttributes(name, args[2], attributes);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeleteProperty) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_CHECKED(JSObject, object, args[0]);
CONVERT_CHECKED(String, key, args[1]);
CONVERT_SMI_CHECKED(strict, args[2]);
return object->DeleteProperty(key, (strict == kStrictMode)
? JSObject::STRICT_DELETION
: JSObject::NORMAL_DELETION);
}
static Object* HasLocalPropertyImplementation(Isolate* isolate,
Handle<JSObject> object,
Handle<String> key) {
if (object->HasLocalProperty(*key)) return isolate->heap()->true_value();
// Handle hidden prototypes. If there's a hidden prototype above this thing
// then we have to check it for properties, because they are supposed to
// look like they are on this object.
Handle<Object> proto(object->GetPrototype());
if (proto->IsJSObject() &&
Handle<JSObject>::cast(proto)->map()->is_hidden_prototype()) {
return HasLocalPropertyImplementation(isolate,
Handle<JSObject>::cast(proto),
key);
}
return isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_HasLocalProperty) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, key, args[1]);
Object* obj = args[0];
// Only JS objects can have properties.
if (obj->IsJSObject()) {
JSObject* object = JSObject::cast(obj);
// Fast case - no interceptors.
if (object->HasRealNamedProperty(key)) return isolate->heap()->true_value();
// Slow case. Either it's not there or we have an interceptor. We should
// have handles for this kind of deal.
HandleScope scope(isolate);
return HasLocalPropertyImplementation(isolate,
Handle<JSObject>(object),
Handle<String>(key));
} else if (obj->IsString()) {
// Well, there is one exception: Handle [] on strings.
uint32_t index;
if (key->AsArrayIndex(&index)) {
String* string = String::cast(obj);
if (index < static_cast<uint32_t>(string->length()))
return isolate->heap()->true_value();
}
}
return isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_HasProperty) {
NoHandleAllocation na;
ASSERT(args.length() == 2);
// Only JS objects can have properties.
if (args[0]->IsJSObject()) {
JSObject* object = JSObject::cast(args[0]);
CONVERT_CHECKED(String, key, args[1]);
if (object->HasProperty(key)) return isolate->heap()->true_value();
}
return isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_HasElement) {
NoHandleAllocation na;
ASSERT(args.length() == 2);
// Only JS objects can have elements.
if (args[0]->IsJSObject()) {
JSObject* object = JSObject::cast(args[0]);
CONVERT_CHECKED(Smi, index_obj, args[1]);
uint32_t index = index_obj->value();
if (object->HasElement(index)) return isolate->heap()->true_value();
}
return isolate->heap()->false_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsPropertyEnumerable) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSObject, object, args[0]);
CONVERT_CHECKED(String, key, args[1]);
uint32_t index;
if (key->AsArrayIndex(&index)) {
return isolate->heap()->ToBoolean(object->HasElement(index));
}
PropertyAttributes att = object->GetLocalPropertyAttribute(key);
return isolate->heap()->ToBoolean(att != ABSENT && (att & DONT_ENUM) == 0);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetPropertyNames) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSObject, object, 0);
return *GetKeysFor(object);
}
// Returns either a FixedArray as Runtime_GetPropertyNames,
// or, if the given object has an enum cache that contains
// all enumerable properties of the object and its prototypes
// have none, the map of the object. This is used to speed up
// the check for deletions during a for-in.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetPropertyNamesFast) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSObject, raw_object, args[0]);
if (raw_object->IsSimpleEnum()) return raw_object->map();
HandleScope scope(isolate);
Handle<JSObject> object(raw_object);
Handle<FixedArray> content = GetKeysInFixedArrayFor(object,
INCLUDE_PROTOS);
// Test again, since cache may have been built by preceding call.
if (object->IsSimpleEnum()) return object->map();
return *content;
}
// Find the length of the prototype chain that is to to handled as one. If a
// prototype object is hidden it is to be viewed as part of the the object it
// is prototype for.
static int LocalPrototypeChainLength(JSObject* obj) {
int count = 1;
Object* proto = obj->GetPrototype();
while (proto->IsJSObject() &&
JSObject::cast(proto)->map()->is_hidden_prototype()) {
count++;
proto = JSObject::cast(proto)->GetPrototype();
}
return count;
}
// Return the names of the local named properties.
// args[0]: object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLocalPropertyNames) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
if (!args[0]->IsJSObject()) {
return isolate->heap()->undefined_value();
}
CONVERT_ARG_CHECKED(JSObject, obj, 0);
// Skip the global proxy as it has no properties and always delegates to the
// real global object.
if (obj->IsJSGlobalProxy()) {
// Only collect names if access is permitted.
if (obj->IsAccessCheckNeeded() &&
!isolate->MayNamedAccess(*obj,
isolate->heap()->undefined_value(),
v8::ACCESS_KEYS)) {
isolate->ReportFailedAccessCheck(*obj, v8::ACCESS_KEYS);
return *isolate->factory()->NewJSArray(0);
}
obj = Handle<JSObject>(JSObject::cast(obj->GetPrototype()));
}
// Find the number of objects making up this.
int length = LocalPrototypeChainLength(*obj);
// Find the number of local properties for each of the objects.
ScopedVector<int> local_property_count(length);
int total_property_count = 0;
Handle<JSObject> jsproto = obj;
for (int i = 0; i < length; i++) {
// Only collect names if access is permitted.
if (jsproto->IsAccessCheckNeeded() &&
!isolate->MayNamedAccess(*jsproto,
isolate->heap()->undefined_value(),
v8::ACCESS_KEYS)) {
isolate->ReportFailedAccessCheck(*jsproto, v8::ACCESS_KEYS);
return *isolate->factory()->NewJSArray(0);
}
int n;
n = jsproto->NumberOfLocalProperties(static_cast<PropertyAttributes>(NONE));
local_property_count[i] = n;
total_property_count += n;
if (i < length - 1) {
jsproto = Handle<JSObject>(JSObject::cast(jsproto->GetPrototype()));
}
}
// Allocate an array with storage for all the property names.
Handle<FixedArray> names =
isolate->factory()->NewFixedArray(total_property_count);
// Get the property names.
jsproto = obj;
int proto_with_hidden_properties = 0;
int next_copy_index = 0;
for (int i = 0; i < length; i++) {
jsproto->GetLocalPropertyNames(*names, next_copy_index);
next_copy_index += local_property_count[i];
if (!GetHiddenProperties(jsproto, false)->IsUndefined()) {
proto_with_hidden_properties++;
}
if (i < length - 1) {
jsproto = Handle<JSObject>(JSObject::cast(jsproto->GetPrototype()));
}
}
// Filter out name of hidden propeties object.
if (proto_with_hidden_properties > 0) {
Handle<FixedArray> old_names = names;
names = isolate->factory()->NewFixedArray(
names->length() - proto_with_hidden_properties);
int dest_pos = 0;
for (int i = 0; i < total_property_count; i++) {
Object* name = old_names->get(i);
if (name == isolate->heap()->hidden_symbol()) {
continue;
}
names->set(dest_pos++, name);
}
}
return *isolate->factory()->NewJSArrayWithElements(names);
}
// Return the names of the local indexed properties.
// args[0]: object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLocalElementNames) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
if (!args[0]->IsJSObject()) {
return isolate->heap()->undefined_value();
}
CONVERT_ARG_CHECKED(JSObject, obj, 0);
int n = obj->NumberOfLocalElements(static_cast<PropertyAttributes>(NONE));
Handle<FixedArray> names = isolate->factory()->NewFixedArray(n);
obj->GetLocalElementKeys(*names, static_cast<PropertyAttributes>(NONE));
return *isolate->factory()->NewJSArrayWithElements(names);
}
// Return information on whether an object has a named or indexed interceptor.
// args[0]: object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetInterceptorInfo) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
if (!args[0]->IsJSObject()) {
return Smi::FromInt(0);
}
CONVERT_ARG_CHECKED(JSObject, obj, 0);
int result = 0;
if (obj->HasNamedInterceptor()) result |= 2;
if (obj->HasIndexedInterceptor()) result |= 1;
return Smi::FromInt(result);
}
// Return property names from named interceptor.
// args[0]: object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetNamedInterceptorPropertyNames) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
if (obj->HasNamedInterceptor()) {
v8::Handle<v8::Array> result = GetKeysForNamedInterceptor(obj, obj);
if (!result.IsEmpty()) return *v8::Utils::OpenHandle(*result);
}
return isolate->heap()->undefined_value();
}
// Return element names from indexed interceptor.
// args[0]: object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetIndexedInterceptorElementNames) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
if (obj->HasIndexedInterceptor()) {
v8::Handle<v8::Array> result = GetKeysForIndexedInterceptor(obj, obj);
if (!result.IsEmpty()) return *v8::Utils::OpenHandle(*result);
}
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_LocalKeys) {
ASSERT_EQ(args.length(), 1);
CONVERT_CHECKED(JSObject, raw_object, args[0]);
HandleScope scope(isolate);
Handle<JSObject> object(raw_object);
if (object->IsJSGlobalProxy()) {
// Do access checks before going to the global object.
if (object->IsAccessCheckNeeded() &&
!isolate->MayNamedAccess(*object, isolate->heap()->undefined_value(),
v8::ACCESS_KEYS)) {
isolate->ReportFailedAccessCheck(*object, v8::ACCESS_KEYS);
return *isolate->factory()->NewJSArray(0);
}
Handle<Object> proto(object->GetPrototype());
// If proxy is detached we simply return an empty array.
if (proto->IsNull()) return *isolate->factory()->NewJSArray(0);
object = Handle<JSObject>::cast(proto);
}
Handle<FixedArray> contents = GetKeysInFixedArrayFor(object,
LOCAL_ONLY);
// Some fast paths through GetKeysInFixedArrayFor reuse a cached
// property array and since the result is mutable we have to create
// a fresh clone on each invocation.
int length = contents->length();
Handle<FixedArray> copy = isolate->factory()->NewFixedArray(length);
for (int i = 0; i < length; i++) {
Object* entry = contents->get(i);
if (entry->IsString()) {
copy->set(i, entry);
} else {
ASSERT(entry->IsNumber());
HandleScope scope(isolate);
Handle<Object> entry_handle(entry, isolate);
Handle<Object> entry_str =
isolate->factory()->NumberToString(entry_handle);
copy->set(i, *entry_str);
}
}
return *isolate->factory()->NewJSArrayWithElements(copy);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetArgumentsProperty) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
// Compute the frame holding the arguments.
JavaScriptFrameIterator it(isolate);
it.AdvanceToArgumentsFrame();
JavaScriptFrame* frame = it.frame();
// Get the actual number of provided arguments.
const uint32_t n = frame->ComputeParametersCount();
// Try to convert the key to an index. If successful and within
// index return the the argument from the frame.
uint32_t index;
if (args[0]->ToArrayIndex(&index) && index < n) {
return frame->GetParameter(index);
}
// Convert the key to a string.
HandleScope scope(isolate);
bool exception = false;
Handle<Object> converted =
Execution::ToString(args.at<Object>(0), &exception);
if (exception) return Failure::Exception();
Handle<String> key = Handle<String>::cast(converted);
// Try to convert the string key into an array index.
if (key->AsArrayIndex(&index)) {
if (index < n) {
return frame->GetParameter(index);
} else {
return isolate->initial_object_prototype()->GetElement(index);
}
}
// Handle special arguments properties.
if (key->Equals(isolate->heap()->length_symbol())) return Smi::FromInt(n);
if (key->Equals(isolate->heap()->callee_symbol())) {
Object* function = frame->function();
if (function->IsJSFunction() &&
JSFunction::cast(function)->shared()->strict_mode()) {
return isolate->Throw(*isolate->factory()->NewTypeError(
"strict_arguments_callee", HandleVector<Object>(NULL, 0)));
}
return function;
}
// Lookup in the initial Object.prototype object.
return isolate->initial_object_prototype()->GetProperty(*key);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ToFastProperties) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<Object> object = args.at<Object>(0);
if (object->IsJSObject()) {
Handle<JSObject> js_object = Handle<JSObject>::cast(object);
if (!js_object->HasFastProperties() && !js_object->IsGlobalObject()) {
MaybeObject* ok = js_object->TransformToFastProperties(0);
if (ok->IsRetryAfterGC()) return ok;
}
}
return *object;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ToSlowProperties) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<Object> object = args.at<Object>(0);
if (object->IsJSObject() && !object->IsJSGlobalProxy()) {
Handle<JSObject> js_object = Handle<JSObject>::cast(object);
NormalizeProperties(js_object, CLEAR_INOBJECT_PROPERTIES, 0);
}
return *object;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ToBool) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
return args[0]->ToBoolean();
}
// Returns the type string of a value; see ECMA-262, 11.4.3 (p 47).
// Possible optimizations: put the type string into the oddballs.
RUNTIME_FUNCTION(MaybeObject*, Runtime_Typeof) {
NoHandleAllocation ha;
Object* obj = args[0];
if (obj->IsNumber()) return isolate->heap()->number_symbol();
HeapObject* heap_obj = HeapObject::cast(obj);
// typeof an undetectable object is 'undefined'
if (heap_obj->map()->is_undetectable()) {
return isolate->heap()->undefined_symbol();
}
InstanceType instance_type = heap_obj->map()->instance_type();
if (instance_type < FIRST_NONSTRING_TYPE) {
return isolate->heap()->string_symbol();
}
switch (instance_type) {
case ODDBALL_TYPE:
if (heap_obj->IsTrue() || heap_obj->IsFalse()) {
return isolate->heap()->boolean_symbol();
}
if (heap_obj->IsNull()) {
return isolate->heap()->object_symbol();
}
ASSERT(heap_obj->IsUndefined());
return isolate->heap()->undefined_symbol();
case JS_FUNCTION_TYPE: case JS_REGEXP_TYPE:
return isolate->heap()->function_symbol();
default:
// For any kind of object not handled above, the spec rule for
// host objects gives that it is okay to return "object"
return isolate->heap()->object_symbol();
}
}
static bool AreDigits(const char*s, int from, int to) {
for (int i = from; i < to; i++) {
if (s[i] < '0' || s[i] > '9') return false;
}
return true;
}
static int ParseDecimalInteger(const char*s, int from, int to) {
ASSERT(to - from < 10); // Overflow is not possible.
ASSERT(from < to);
int d = s[from] - '0';
for (int i = from + 1; i < to; i++) {
d = 10 * d + (s[i] - '0');
}
return d;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToNumber) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, subject, args[0]);
subject->TryFlatten();
// Fast case: short integer or some sorts of junk values.
int len = subject->length();
if (subject->IsSeqAsciiString()) {
if (len == 0) return Smi::FromInt(0);
char const* data = SeqAsciiString::cast(subject)->GetChars();
bool minus = (data[0] == '-');
int start_pos = (minus ? 1 : 0);
if (start_pos == len) {
return isolate->heap()->nan_value();
} else if (data[start_pos] > '9') {
// Fast check for a junk value. A valid string may start from a
// whitespace, a sign ('+' or '-'), the decimal point, a decimal digit or
// the 'I' character ('Infinity'). All of that have codes not greater than
// '9' except 'I'.
if (data[start_pos] != 'I') {
return isolate->heap()->nan_value();
}
} else if (len - start_pos < 10 && AreDigits(data, start_pos, len)) {
// The maximal/minimal smi has 10 digits. If the string has less digits we
// know it will fit into the smi-data type.
int d = ParseDecimalInteger(data, start_pos, len);
if (minus) {
if (d == 0) return isolate->heap()->minus_zero_value();
d = -d;
} else if (!subject->HasHashCode() &&
len <= String::kMaxArrayIndexSize &&
(len == 1 || data[0] != '0')) {
// String hash is not calculated yet but all the data are present.
// Update the hash field to speed up sequential convertions.
uint32_t hash = StringHasher::MakeArrayIndexHash(d, len);
#ifdef DEBUG
subject->Hash(); // Force hash calculation.
ASSERT_EQ(static_cast<int>(subject->hash_field()),
static_cast<int>(hash));
#endif
subject->set_hash_field(hash);
}
return Smi::FromInt(d);
}
}
// Slower case.
return isolate->heap()->NumberFromDouble(
StringToDouble(isolate->unicode_cache(), subject, ALLOW_HEX));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringFromCharCodeArray) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSArray, codes, args[0]);
int length = Smi::cast(codes->length())->value();
// Check if the string can be ASCII.
int i;
for (i = 0; i < length; i++) {
Object* element;
{ MaybeObject* maybe_element = codes->GetElement(i);
// We probably can't get an exception here, but just in order to enforce
// the checking of inputs in the runtime calls we check here.
if (!maybe_element->ToObject(&element)) return maybe_element;
}
CONVERT_NUMBER_CHECKED(int, chr, Int32, element);
if ((chr & 0xffff) > String::kMaxAsciiCharCode)
break;
}
MaybeObject* maybe_object = NULL;
if (i == length) { // The string is ASCII.
maybe_object = isolate->heap()->AllocateRawAsciiString(length);
} else { // The string is not ASCII.
maybe_object = isolate->heap()->AllocateRawTwoByteString(length);
}
Object* object = NULL;
if (!maybe_object->ToObject(&object)) return maybe_object;
String* result = String::cast(object);
for (int i = 0; i < length; i++) {
Object* element;
{ MaybeObject* maybe_element = codes->GetElement(i);
if (!maybe_element->ToObject(&element)) return maybe_element;
}
CONVERT_NUMBER_CHECKED(int, chr, Int32, element);
result->Set(i, chr & 0xffff);
}
return result;
}
// kNotEscaped is generated by the following:
//
// #!/bin/perl
// for (my $i = 0; $i < 256; $i++) {
// print "\n" if $i % 16 == 0;
// my $c = chr($i);
// my $escaped = 1;
// $escaped = 0 if $c =~ m#[A-Za-z0-9@*_+./-]#;
// print $escaped ? "0, " : "1, ";
// }
static bool IsNotEscaped(uint16_t character) {
// Only for 8 bit characters, the rest are always escaped (in a different way)
ASSERT(character < 256);
static const char kNotEscaped[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
return kNotEscaped[character] != 0;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_URIEscape) {
const char hex_chars[] = "0123456789ABCDEF";
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, source, args[0]);
source->TryFlatten();
int escaped_length = 0;
int length = source->length();
{
Access<StringInputBuffer> buffer(
isolate->runtime_state()->string_input_buffer());
buffer->Reset(source);
while (buffer->has_more()) {
uint16_t character = buffer->GetNext();
if (character >= 256) {
escaped_length += 6;
} else if (IsNotEscaped(character)) {
escaped_length++;
} else {
escaped_length += 3;
}
// We don't allow strings that are longer than a maximal length.
ASSERT(String::kMaxLength < 0x7fffffff - 6); // Cannot overflow.
if (escaped_length > String::kMaxLength) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
}
}
// No length change implies no change. Return original string if no change.
if (escaped_length == length) {
return source;
}
Object* o;
{ MaybeObject* maybe_o =
isolate->heap()->AllocateRawAsciiString(escaped_length);
if (!maybe_o->ToObject(&o)) return maybe_o;
}
String* destination = String::cast(o);
int dest_position = 0;
Access<StringInputBuffer> buffer(
isolate->runtime_state()->string_input_buffer());
buffer->Rewind();
while (buffer->has_more()) {
uint16_t chr = buffer->GetNext();
if (chr >= 256) {
destination->Set(dest_position, '%');
destination->Set(dest_position+1, 'u');
destination->Set(dest_position+2, hex_chars[chr >> 12]);
destination->Set(dest_position+3, hex_chars[(chr >> 8) & 0xf]);
destination->Set(dest_position+4, hex_chars[(chr >> 4) & 0xf]);
destination->Set(dest_position+5, hex_chars[chr & 0xf]);
dest_position += 6;
} else if (IsNotEscaped(chr)) {
destination->Set(dest_position, chr);
dest_position++;
} else {
destination->Set(dest_position, '%');
destination->Set(dest_position+1, hex_chars[chr >> 4]);
destination->Set(dest_position+2, hex_chars[chr & 0xf]);
dest_position += 3;
}
}
return destination;
}
static inline int TwoDigitHex(uint16_t character1, uint16_t character2) {
static const signed char kHexValue['g'] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15 };
if (character1 > 'f') return -1;
int hi = kHexValue[character1];
if (hi == -1) return -1;
if (character2 > 'f') return -1;
int lo = kHexValue[character2];
if (lo == -1) return -1;
return (hi << 4) + lo;
}
static inline int Unescape(String* source,
int i,
int length,
int* step) {
uint16_t character = source->Get(i);
int32_t hi = 0;
int32_t lo = 0;
if (character == '%' &&
i <= length - 6 &&
source->Get(i + 1) == 'u' &&
(hi = TwoDigitHex(source->Get(i + 2),
source->Get(i + 3))) != -1 &&
(lo = TwoDigitHex(source->Get(i + 4),
source->Get(i + 5))) != -1) {
*step = 6;
return (hi << 8) + lo;
} else if (character == '%' &&
i <= length - 3 &&
(lo = TwoDigitHex(source->Get(i + 1),
source->Get(i + 2))) != -1) {
*step = 3;
return lo;
} else {
*step = 1;
return character;
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_URIUnescape) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, source, args[0]);
source->TryFlatten();
bool ascii = true;
int length = source->length();
int unescaped_length = 0;
for (int i = 0; i < length; unescaped_length++) {
int step;
if (Unescape(source, i, length, &step) > String::kMaxAsciiCharCode) {
ascii = false;
}
i += step;
}
// No length change implies no change. Return original string if no change.
if (unescaped_length == length)
return source;
Object* o;
{ MaybeObject* maybe_o =
ascii ?
isolate->heap()->AllocateRawAsciiString(unescaped_length) :
isolate->heap()->AllocateRawTwoByteString(unescaped_length);
if (!maybe_o->ToObject(&o)) return maybe_o;
}
String* destination = String::cast(o);
int dest_position = 0;
for (int i = 0; i < length; dest_position++) {
int step;
destination->Set(dest_position, Unescape(source, i, length, &step));
i += step;
}
return destination;
}
static const unsigned int kQuoteTableLength = 128u;
static const int kJsonQuotesCharactersPerEntry = 8;
static const char* const JsonQuotes =
"\\u0000 \\u0001 \\u0002 \\u0003 "
"\\u0004 \\u0005 \\u0006 \\u0007 "
"\\b \\t \\n \\u000b "
"\\f \\r \\u000e \\u000f "
"\\u0010 \\u0011 \\u0012 \\u0013 "
"\\u0014 \\u0015 \\u0016 \\u0017 "
"\\u0018 \\u0019 \\u001a \\u001b "
"\\u001c \\u001d \\u001e \\u001f "
" ! \\\" # "
"$ % & ' "
"( ) * + "
", - . / "
"0 1 2 3 "
"4 5 6 7 "
"8 9 : ; "
"< = > ? "
"@ A B C "
"D E F G "
"H I J K "
"L M N O "
"P Q R S "
"T U V W "
"X Y Z [ "
"\\\\ ] ^ _ "
"` a b c "
"d e f g "
"h i j k "
"l m n o "
"p q r s "
"t u v w "
"x y z { "
"| } ~ \177 ";
// For a string that is less than 32k characters it should always be
// possible to allocate it in new space.
static const int kMaxGuaranteedNewSpaceString = 32 * 1024;
// Doing JSON quoting cannot make the string more than this many times larger.
static const int kJsonQuoteWorstCaseBlowup = 6;
// Covers the entire ASCII range (all other characters are unchanged by JSON
// quoting).
static const byte JsonQuoteLengths[kQuoteTableLength] = {
6, 6, 6, 6, 6, 6, 6, 6,
2, 2, 2, 6, 2, 2, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6,
1, 1, 2, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 2, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
};
template <typename StringType>
MaybeObject* AllocateRawString(Isolate* isolate, int length);
template <>
MaybeObject* AllocateRawString<SeqTwoByteString>(Isolate* isolate, int length) {
return isolate->heap()->AllocateRawTwoByteString(length);
}
template <>
MaybeObject* AllocateRawString<SeqAsciiString>(Isolate* isolate, int length) {
return isolate->heap()->AllocateRawAsciiString(length);
}
template <typename Char, typename StringType, bool comma>
static MaybeObject* SlowQuoteJsonString(Isolate* isolate,
Vector<const Char> characters) {
int length = characters.length();
const Char* read_cursor = characters.start();
const Char* end = read_cursor + length;
const int kSpaceForQuotes = 2 + (comma ? 1 :0);
int quoted_length = kSpaceForQuotes;
while (read_cursor < end) {
Char c = *(read_cursor++);
if (sizeof(Char) > 1u && static_cast<unsigned>(c) >= kQuoteTableLength) {
quoted_length++;
} else {
quoted_length += JsonQuoteLengths[static_cast<unsigned>(c)];
}
}
MaybeObject* new_alloc = AllocateRawString<StringType>(isolate,
quoted_length);
Object* new_object;
if (!new_alloc->ToObject(&new_object)) {
return new_alloc;
}
StringType* new_string = StringType::cast(new_object);
Char* write_cursor = reinterpret_cast<Char*>(
new_string->address() + SeqAsciiString::kHeaderSize);
if (comma) *(write_cursor++) = ',';
*(write_cursor++) = '"';
read_cursor = characters.start();
while (read_cursor < end) {
Char c = *(read_cursor++);
if (sizeof(Char) > 1u && static_cast<unsigned>(c) >= kQuoteTableLength) {
*(write_cursor++) = c;
} else {
int len = JsonQuoteLengths[static_cast<unsigned>(c)];
const char* replacement = JsonQuotes +
static_cast<unsigned>(c) * kJsonQuotesCharactersPerEntry;
for (int i = 0; i < len; i++) {
*write_cursor++ = *replacement++;
}
}
}
*(write_cursor++) = '"';
return new_string;
}
template <typename Char, typename StringType, bool comma>
static MaybeObject* QuoteJsonString(Isolate* isolate,
Vector<const Char> characters) {
int length = characters.length();
isolate->counters()->quote_json_char_count()->Increment(length);
const int kSpaceForQuotes = 2 + (comma ? 1 :0);
int worst_case_length = length * kJsonQuoteWorstCaseBlowup + kSpaceForQuotes;
if (worst_case_length > kMaxGuaranteedNewSpaceString) {
return SlowQuoteJsonString<Char, StringType, comma>(isolate, characters);
}
MaybeObject* new_alloc = AllocateRawString<StringType>(isolate,
worst_case_length);
Object* new_object;
if (!new_alloc->ToObject(&new_object)) {
return new_alloc;
}
if (!isolate->heap()->new_space()->Contains(new_object)) {
// Even if our string is small enough to fit in new space we still have to
// handle it being allocated in old space as may happen in the third
// attempt. See CALL_AND_RETRY in heap-inl.h and similar code in
// CEntryStub::GenerateCore.
return SlowQuoteJsonString<Char, StringType, comma>(isolate, characters);
}
StringType* new_string = StringType::cast(new_object);
ASSERT(isolate->heap()->new_space()->Contains(new_string));
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize);
Char* write_cursor = reinterpret_cast<Char*>(
new_string->address() + SeqAsciiString::kHeaderSize);
if (comma) *(write_cursor++) = ',';
*(write_cursor++) = '"';
const Char* read_cursor = characters.start();
const Char* end = read_cursor + length;
while (read_cursor < end) {
Char c = *(read_cursor++);
if (sizeof(Char) > 1u && static_cast<unsigned>(c) >= kQuoteTableLength) {
*(write_cursor++) = c;
} else {
int len = JsonQuoteLengths[static_cast<unsigned>(c)];
const char* replacement = JsonQuotes +
static_cast<unsigned>(c) * kJsonQuotesCharactersPerEntry;
write_cursor[0] = replacement[0];
if (len > 1) {
write_cursor[1] = replacement[1];
if (len > 2) {
ASSERT(len == 6);
write_cursor[2] = replacement[2];
write_cursor[3] = replacement[3];
write_cursor[4] = replacement[4];
write_cursor[5] = replacement[5];
}
}
write_cursor += len;
}
}
*(write_cursor++) = '"';
int final_length = static_cast<int>(
write_cursor - reinterpret_cast<Char*>(
new_string->address() + SeqAsciiString::kHeaderSize));
isolate->heap()->new_space()->
template ShrinkStringAtAllocationBoundary<StringType>(
new_string, final_length);
return new_string;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_QuoteJSONString) {
NoHandleAllocation ha;
CONVERT_CHECKED(String, str, args[0]);
if (!str->IsFlat()) {
MaybeObject* try_flatten = str->TryFlatten();
Object* flat;
if (!try_flatten->ToObject(&flat)) {
return try_flatten;
}
str = String::cast(flat);
ASSERT(str->IsFlat());
}
if (str->IsTwoByteRepresentation()) {
return QuoteJsonString<uc16, SeqTwoByteString, false>(isolate,
str->ToUC16Vector());
} else {
return QuoteJsonString<char, SeqAsciiString, false>(isolate,
str->ToAsciiVector());
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_QuoteJSONStringComma) {
NoHandleAllocation ha;
CONVERT_CHECKED(String, str, args[0]);
if (!str->IsFlat()) {
MaybeObject* try_flatten = str->TryFlatten();
Object* flat;
if (!try_flatten->ToObject(&flat)) {
return try_flatten;
}
str = String::cast(flat);
ASSERT(str->IsFlat());
}
if (str->IsTwoByteRepresentation()) {
return QuoteJsonString<uc16, SeqTwoByteString, true>(isolate,
str->ToUC16Vector());
} else {
return QuoteJsonString<char, SeqAsciiString, true>(isolate,
str->ToAsciiVector());
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringParseInt) {
NoHandleAllocation ha;
CONVERT_CHECKED(String, s, args[0]);
CONVERT_SMI_CHECKED(radix, args[1]);
s->TryFlatten();
RUNTIME_ASSERT(radix == 0 || (2 <= radix && radix <= 36));
double value = StringToInt(isolate->unicode_cache(), s, radix);
return isolate->heap()->NumberFromDouble(value);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringParseFloat) {
NoHandleAllocation ha;
CONVERT_CHECKED(String, str, args[0]);
// ECMA-262 section 15.1.2.3, empty string is NaN
double value = StringToDouble(isolate->unicode_cache(),
str, ALLOW_TRAILING_JUNK, OS::nan_value());
// Create a number object from the value.
return isolate->heap()->NumberFromDouble(value);
}
template <class Converter>
MUST_USE_RESULT static MaybeObject* ConvertCaseHelper(
Isolate* isolate,
String* s,
int length,
int input_string_length,
unibrow::Mapping<Converter, 128>* mapping) {
// We try this twice, once with the assumption that the result is no longer
// than the input and, if that assumption breaks, again with the exact
// length. This may not be pretty, but it is nicer than what was here before
// and I hereby claim my vaffel-is.
//
// Allocate the resulting string.
//
// NOTE: This assumes that the upper/lower case of an ascii
// character is also ascii. This is currently the case, but it
// might break in the future if we implement more context and locale
// dependent upper/lower conversions.
Object* o;
{ MaybeObject* maybe_o = s->IsAsciiRepresentation()
? isolate->heap()->AllocateRawAsciiString(length)
: isolate->heap()->AllocateRawTwoByteString(length);
if (!maybe_o->ToObject(&o)) return maybe_o;
}
String* result = String::cast(o);
bool has_changed_character = false;
// Convert all characters to upper case, assuming that they will fit
// in the buffer
Access<StringInputBuffer> buffer(
isolate->runtime_state()->string_input_buffer());
buffer->Reset(s);
unibrow::uchar chars[Converter::kMaxWidth];
// We can assume that the string is not empty
uc32 current = buffer->GetNext();
for (int i = 0; i < length;) {
bool has_next = buffer->has_more();
uc32 next = has_next ? buffer->GetNext() : 0;
int char_length = mapping->get(current, next, chars);
if (char_length == 0) {
// The case conversion of this character is the character itself.
result->Set(i, current);
i++;
} else if (char_length == 1) {
// Common case: converting the letter resulted in one character.
ASSERT(static_cast<uc32>(chars[0]) != current);
result->Set(i, chars[0]);
has_changed_character = true;
i++;
} else if (length == input_string_length) {
// We've assumed that the result would be as long as the
// input but here is a character that converts to several
// characters. No matter, we calculate the exact length
// of the result and try the whole thing again.
//
// Note that this leaves room for optimization. We could just
// memcpy what we already have to the result string. Also,
// the result string is the last object allocated we could
// "realloc" it and probably, in the vast majority of cases,
// extend the existing string to be able to hold the full
// result.
int next_length = 0;
if (has_next) {
next_length = mapping->get(next, 0, chars);
if (next_length == 0) next_length = 1;
}
int current_length = i + char_length + next_length;
while (buffer->has_more()) {
current = buffer->GetNext();
// NOTE: we use 0 as the next character here because, while
// the next character may affect what a character converts to,
// it does not in any case affect the length of what it convert
// to.
int char_length = mapping->get(current, 0, chars);
if (char_length == 0) char_length = 1;
current_length += char_length;
if (current_length > Smi::kMaxValue) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
}
// Try again with the real length.
return Smi::FromInt(current_length);
} else {
for (int j = 0; j < char_length; j++) {
result->Set(i, chars[j]);
i++;
}
has_changed_character = true;
}
current = next;
}
if (has_changed_character) {
return result;
} else {
// If we didn't actually change anything in doing the conversion
// we simple return the result and let the converted string
// become garbage; there is no reason to keep two identical strings
// alive.
return s;
}
}
namespace {
static const uintptr_t kOneInEveryByte = kUintptrAllBitsSet / 0xFF;
// Given a word and two range boundaries returns a word with high bit
// set in every byte iff the corresponding input byte was strictly in
// the range (m, n). All the other bits in the result are cleared.
// This function is only useful when it can be inlined and the
// boundaries are statically known.
// Requires: all bytes in the input word and the boundaries must be
// ascii (less than 0x7F).
static inline uintptr_t AsciiRangeMask(uintptr_t w, char m, char n) {
// Every byte in an ascii string is less than or equal to 0x7F.
ASSERT((w & (kOneInEveryByte * 0x7F)) == w);
// Use strict inequalities since in edge cases the function could be
// further simplified.
ASSERT(0 < m && m < n && n < 0x7F);
// Has high bit set in every w byte less than n.
uintptr_t tmp1 = kOneInEveryByte * (0x7F + n) - w;
// Has high bit set in every w byte greater than m.
uintptr_t tmp2 = w + kOneInEveryByte * (0x7F - m);
return (tmp1 & tmp2 & (kOneInEveryByte * 0x80));
}
enum AsciiCaseConversion {
ASCII_TO_LOWER,
ASCII_TO_UPPER
};
template <AsciiCaseConversion dir>
struct FastAsciiConverter {
static bool Convert(char* dst, char* src, int length) {
#ifdef DEBUG
char* saved_dst = dst;
char* saved_src = src;
#endif
// We rely on the distance between upper and lower case letters
// being a known power of 2.
ASSERT('a' - 'A' == (1 << 5));
// Boundaries for the range of input characters than require conversion.
const char lo = (dir == ASCII_TO_LOWER) ? 'A' - 1 : 'a' - 1;
const char hi = (dir == ASCII_TO_LOWER) ? 'Z' + 1 : 'z' + 1;
bool changed = false;
char* const limit = src + length;
#ifdef V8_HOST_CAN_READ_UNALIGNED
// Process the prefix of the input that requires no conversion one
// (machine) word at a time.
while (src <= limit - sizeof(uintptr_t)) {
uintptr_t w = *reinterpret_cast<uintptr_t*>(src);
if (AsciiRangeMask(w, lo, hi) != 0) {
changed = true;
break;
}
*reinterpret_cast<uintptr_t*>(dst) = w;
src += sizeof(uintptr_t);
dst += sizeof(uintptr_t);
}
// Process the remainder of the input performing conversion when
// required one word at a time.
while (src <= limit - sizeof(uintptr_t)) {
uintptr_t w = *reinterpret_cast<uintptr_t*>(src);
uintptr_t m = AsciiRangeMask(w, lo, hi);
// The mask has high (7th) bit set in every byte that needs
// conversion and we know that the distance between cases is
// 1 << 5.
*reinterpret_cast<uintptr_t*>(dst) = w ^ (m >> 2);
src += sizeof(uintptr_t);
dst += sizeof(uintptr_t);
}
#endif
// Process the last few bytes of the input (or the whole input if
// unaligned access is not supported).
while (src < limit) {
char c = *src;
if (lo < c && c < hi) {
c ^= (1 << 5);
changed = true;
}
*dst = c;
++src;
++dst;
}
#ifdef DEBUG
CheckConvert(saved_dst, saved_src, length, changed);
#endif
return changed;
}
#ifdef DEBUG
static void CheckConvert(char* dst, char* src, int length, bool changed) {
bool expected_changed = false;
for (int i = 0; i < length; i++) {
if (dst[i] == src[i]) continue;
expected_changed = true;
if (dir == ASCII_TO_LOWER) {
ASSERT('A' <= src[i] && src[i] <= 'Z');
ASSERT(dst[i] == src[i] + ('a' - 'A'));
} else {
ASSERT(dir == ASCII_TO_UPPER);
ASSERT('a' <= src[i] && src[i] <= 'z');
ASSERT(dst[i] == src[i] - ('a' - 'A'));
}
}
ASSERT(expected_changed == changed);
}
#endif
};
struct ToLowerTraits {
typedef unibrow::ToLowercase UnibrowConverter;
typedef FastAsciiConverter<ASCII_TO_LOWER> AsciiConverter;
};
struct ToUpperTraits {
typedef unibrow::ToUppercase UnibrowConverter;
typedef FastAsciiConverter<ASCII_TO_UPPER> AsciiConverter;
};
} // namespace
template <typename ConvertTraits>
MUST_USE_RESULT static MaybeObject* ConvertCase(
Arguments args,
Isolate* isolate,
unibrow::Mapping<typename ConvertTraits::UnibrowConverter, 128>* mapping) {
NoHandleAllocation ha;
CONVERT_CHECKED(String, s, args[0]);
s = s->TryFlattenGetString();
const int length = s->length();
// Assume that the string is not empty; we need this assumption later
if (length == 0) return s;
// Simpler handling of ascii strings.
//
// NOTE: This assumes that the upper/lower case of an ascii
// character is also ascii. This is currently the case, but it
// might break in the future if we implement more context and locale
// dependent upper/lower conversions.
if (s->IsSeqAsciiString()) {
Object* o;
{ MaybeObject* maybe_o = isolate->heap()->AllocateRawAsciiString(length);
if (!maybe_o->ToObject(&o)) return maybe_o;
}
SeqAsciiString* result = SeqAsciiString::cast(o);
bool has_changed_character = ConvertTraits::AsciiConverter::Convert(
result->GetChars(), SeqAsciiString::cast(s)->GetChars(), length);
return has_changed_character ? result : s;
}
Object* answer;
{ MaybeObject* maybe_answer =
ConvertCaseHelper(isolate, s, length, length, mapping);
if (!maybe_answer->ToObject(&answer)) return maybe_answer;
}
if (answer->IsSmi()) {
// Retry with correct length.
{ MaybeObject* maybe_answer =
ConvertCaseHelper(isolate,
s, Smi::cast(answer)->value(), length, mapping);
if (!maybe_answer->ToObject(&answer)) return maybe_answer;
}
}
return answer;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToLowerCase) {
return ConvertCase<ToLowerTraits>(
args, isolate, isolate->runtime_state()->to_lower_mapping());
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToUpperCase) {
return ConvertCase<ToUpperTraits>(
args, isolate, isolate->runtime_state()->to_upper_mapping());
}
static inline bool IsTrimWhiteSpace(unibrow::uchar c) {
return unibrow::WhiteSpace::Is(c) || c == 0x200b;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringTrim) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_CHECKED(String, s, args[0]);
CONVERT_BOOLEAN_CHECKED(trimLeft, args[1]);
CONVERT_BOOLEAN_CHECKED(trimRight, args[2]);
s->TryFlatten();
int length = s->length();
int left = 0;
if (trimLeft) {
while (left < length && IsTrimWhiteSpace(s->Get(left))) {
left++;
}
}
int right = length;
if (trimRight) {
while (right > left && IsTrimWhiteSpace(s->Get(right - 1))) {
right--;
}
}
return s->SubString(left, right);
}
template <typename SubjectChar, typename PatternChar>
void FindStringIndices(Isolate* isolate,
Vector<const SubjectChar> subject,
Vector<const PatternChar> pattern,
ZoneList<int>* indices,
unsigned int limit) {
ASSERT(limit > 0);
// Collect indices of pattern in subject, and the end-of-string index.
// Stop after finding at most limit values.
StringSearch<PatternChar, SubjectChar> search(isolate, pattern);
int pattern_length = pattern.length();
int index = 0;
while (limit > 0) {
index = search.Search(subject, index);
if (index < 0) return;
indices->Add(index);
index += pattern_length;
limit--;
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringSplit) {
ASSERT(args.length() == 3);
HandleScope handle_scope(isolate);
CONVERT_ARG_CHECKED(String, subject, 0);
CONVERT_ARG_CHECKED(String, pattern, 1);
CONVERT_NUMBER_CHECKED(uint32_t, limit, Uint32, args[2]);
int subject_length = subject->length();
int pattern_length = pattern->length();
RUNTIME_ASSERT(pattern_length > 0);
// The limit can be very large (0xffffffffu), but since the pattern
// isn't empty, we can never create more parts than ~half the length
// of the subject.
if (!subject->IsFlat()) FlattenString(subject);
static const int kMaxInitialListCapacity = 16;
ZoneScope scope(DELETE_ON_EXIT);
// Find (up to limit) indices of separator and end-of-string in subject
int initial_capacity = Min<uint32_t>(kMaxInitialListCapacity, limit);
ZoneList<int> indices(initial_capacity);
if (!pattern->IsFlat()) FlattenString(pattern);
// No allocation block.
{
AssertNoAllocation nogc;
if (subject->IsAsciiRepresentation()) {
Vector<const char> subject_vector = subject->ToAsciiVector();
if (pattern->IsAsciiRepresentation()) {
FindStringIndices(isolate,
subject_vector,
pattern->ToAsciiVector(),
&indices,
limit);
} else {
FindStringIndices(isolate,
subject_vector,
pattern->ToUC16Vector(),
&indices,
limit);
}
} else {
Vector<const uc16> subject_vector = subject->ToUC16Vector();
if (pattern->IsAsciiRepresentation()) {
FindStringIndices(isolate,
subject_vector,
pattern->ToAsciiVector(),
&indices,
limit);
} else {
FindStringIndices(isolate,
subject_vector,
pattern->ToUC16Vector(),
&indices,
limit);
}
}
}
if (static_cast<uint32_t>(indices.length()) < limit) {
indices.Add(subject_length);
}
// The list indices now contains the end of each part to create.
// Create JSArray of substrings separated by separator.
int part_count = indices.length();
Handle<JSArray> result = isolate->factory()->NewJSArray(part_count);
result->set_length(Smi::FromInt(part_count));
ASSERT(result->HasFastElements());
if (part_count == 1 && indices.at(0) == subject_length) {
FixedArray::cast(result->elements())->set(0, *subject);
return *result;
}
Handle<FixedArray> elements(FixedArray::cast(result->elements()));
int part_start = 0;
for (int i = 0; i < part_count; i++) {
HandleScope local_loop_handle;
int part_end = indices.at(i);
Handle<String> substring =
isolate->factory()->NewSubString(subject, part_start, part_end);
elements->set(i, *substring);
part_start = part_end + pattern_length;
}
return *result;
}
// Copies ascii characters to the given fixed array looking up
// one-char strings in the cache. Gives up on the first char that is
// not in the cache and fills the remainder with smi zeros. Returns
// the length of the successfully copied prefix.
static int CopyCachedAsciiCharsToArray(Heap* heap,
const char* chars,
FixedArray* elements,
int length) {
AssertNoAllocation nogc;
FixedArray* ascii_cache = heap->single_character_string_cache();
Object* undefined = heap->undefined_value();
int i;
for (i = 0; i < length; ++i) {
Object* value = ascii_cache->get(chars[i]);
if (value == undefined) break;
ASSERT(!heap->InNewSpace(value));
elements->set(i, value, SKIP_WRITE_BARRIER);
}
if (i < length) {
ASSERT(Smi::FromInt(0) == 0);
memset(elements->data_start() + i, 0, kPointerSize * (length - i));
}
#ifdef DEBUG
for (int j = 0; j < length; ++j) {
Object* element = elements->get(j);
ASSERT(element == Smi::FromInt(0) ||
(element->IsString() && String::cast(element)->LooksValid()));
}
#endif
return i;
}
// Converts a String to JSArray.
// For example, "foo" => ["f", "o", "o"].
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToArray) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(String, s, 0);
CONVERT_NUMBER_CHECKED(uint32_t, limit, Uint32, args[1]);
s->TryFlatten();
const int length = static_cast<int>(Min<uint32_t>(s->length(), limit));
Handle<FixedArray> elements;
if (s->IsFlat() && s->IsAsciiRepresentation()) {
Object* obj;
{ MaybeObject* maybe_obj =
isolate->heap()->AllocateUninitializedFixedArray(length);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
elements = Handle<FixedArray>(FixedArray::cast(obj), isolate);
Vector<const char> chars = s->ToAsciiVector();
// Note, this will initialize all elements (not only the prefix)
// to prevent GC from seeing partially initialized array.
int num_copied_from_cache = CopyCachedAsciiCharsToArray(isolate->heap(),
chars.start(),
*elements,
length);
for (int i = num_copied_from_cache; i < length; ++i) {
Handle<Object> str = LookupSingleCharacterStringFromCode(chars[i]);
elements->set(i, *str);
}
} else {
elements = isolate->factory()->NewFixedArray(length);
for (int i = 0; i < length; ++i) {
Handle<Object> str = LookupSingleCharacterStringFromCode(s->Get(i));
elements->set(i, *str);
}
}
#ifdef DEBUG
for (int i = 0; i < length; ++i) {
ASSERT(String::cast(elements->get(i))->length() == 1);
}
#endif
return *isolate->factory()->NewJSArrayWithElements(elements);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewStringWrapper) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, value, args[0]);
return value->ToObject();
}
bool Runtime::IsUpperCaseChar(RuntimeState* runtime_state, uint16_t ch) {
unibrow::uchar chars[unibrow::ToUppercase::kMaxWidth];
int char_length = runtime_state->to_upper_mapping()->get(ch, 0, chars);
return char_length == 0;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToString) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Object* number = args[0];
RUNTIME_ASSERT(number->IsNumber());
return isolate->heap()->NumberToString(number);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToStringSkipCache) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Object* number = args[0];
RUNTIME_ASSERT(number->IsNumber());
return isolate->heap()->NumberToString(number, false);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToInteger) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(number, args[0]);
// We do not include 0 so that we don't have to treat +0 / -0 cases.
if (number > 0 && number <= Smi::kMaxValue) {
return Smi::FromInt(static_cast<int>(number));
}
return isolate->heap()->NumberFromDouble(DoubleToInteger(number));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToIntegerMapMinusZero) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(number, args[0]);
// We do not include 0 so that we don't have to treat +0 / -0 cases.
if (number > 0 && number <= Smi::kMaxValue) {
return Smi::FromInt(static_cast<int>(number));
}
double double_value = DoubleToInteger(number);
// Map both -0 and +0 to +0.
if (double_value == 0) double_value = 0;
return isolate->heap()->NumberFromDouble(double_value);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToJSUint32) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_NUMBER_CHECKED(int32_t, number, Uint32, args[0]);
return isolate->heap()->NumberFromUint32(number);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToJSInt32) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(number, args[0]);
// We do not include 0 so that we don't have to treat +0 / -0 cases.
if (number > 0 && number <= Smi::kMaxValue) {
return Smi::FromInt(static_cast<int>(number));
}
return isolate->heap()->NumberFromInt32(DoubleToInt32(number));
}
// Converts a Number to a Smi, if possible. Returns NaN if the number is not
// a small integer.
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToSmi) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Object* obj = args[0];
if (obj->IsSmi()) {
return obj;
}
if (obj->IsHeapNumber()) {
double value = HeapNumber::cast(obj)->value();
int int_value = FastD2I(value);
if (value == FastI2D(int_value) && Smi::IsValid(int_value)) {
return Smi::FromInt(int_value);
}
}
return isolate->heap()->nan_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateHeapNumber) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
return isolate->heap()->AllocateHeapNumber(0);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberAdd) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
return isolate->heap()->NumberFromDouble(x + y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberSub) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
return isolate->heap()->NumberFromDouble(x - y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberMul) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
return isolate->heap()->NumberFromDouble(x * y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberUnaryMinus) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->heap()->NumberFromDouble(-x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberAlloc) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
return isolate->heap()->NumberFromDouble(9876543210.0);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberDiv) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
return isolate->heap()->NumberFromDouble(x / y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberMod) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
x = modulo(x, y);
// NumberFromDouble may return a Smi instead of a Number object
return isolate->heap()->NumberFromDouble(x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringAdd) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, str1, args[0]);
CONVERT_CHECKED(String, str2, args[1]);
isolate->counters()->string_add_runtime()->Increment();
return isolate->heap()->AllocateConsString(str1, str2);
}
template <typename sinkchar>
static inline void StringBuilderConcatHelper(String* special,
sinkchar* sink,
FixedArray* fixed_array,
int array_length) {
int position = 0;
for (int i = 0; i < array_length; i++) {
Object* element = fixed_array->get(i);
if (element->IsSmi()) {
// Smi encoding of position and length.
int encoded_slice = Smi::cast(element)->value();
int pos;
int len;
if (encoded_slice > 0) {
// Position and length encoded in one smi.
pos = StringBuilderSubstringPosition::decode(encoded_slice);
len = StringBuilderSubstringLength::decode(encoded_slice);
} else {
// Position and length encoded in two smis.
Object* obj = fixed_array->get(++i);
ASSERT(obj->IsSmi());
pos = Smi::cast(obj)->value();
len = -encoded_slice;
}
String::WriteToFlat(special,
sink + position,
pos,
pos + len);
position += len;
} else {
String* string = String::cast(element);
int element_length = string->length();
String::WriteToFlat(string, sink + position, 0, element_length);
position += element_length;
}
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringBuilderConcat) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_CHECKED(JSArray, array, args[0]);
if (!args[1]->IsSmi()) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
int array_length = Smi::cast(args[1])->value();
CONVERT_CHECKED(String, special, args[2]);
// This assumption is used by the slice encoding in one or two smis.
ASSERT(Smi::kMaxValue >= String::kMaxLength);
int special_length = special->length();
if (!array->HasFastElements()) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
FixedArray* fixed_array = FixedArray::cast(array->elements());
if (fixed_array->length() < array_length) {
array_length = fixed_array->length();
}
if (array_length == 0) {
return isolate->heap()->empty_string();
} else if (array_length == 1) {
Object* first = fixed_array->get(0);
if (first->IsString()) return first;
}
bool ascii = special->HasOnlyAsciiChars();
int position = 0;
for (int i = 0; i < array_length; i++) {
int increment = 0;
Object* elt = fixed_array->get(i);
if (elt->IsSmi()) {
// Smi encoding of position and length.
int smi_value = Smi::cast(elt)->value();
int pos;
int len;
if (smi_value > 0) {
// Position and length encoded in one smi.
pos = StringBuilderSubstringPosition::decode(smi_value);
len = StringBuilderSubstringLength::decode(smi_value);
} else {
// Position and length encoded in two smis.
len = -smi_value;
// Get the position and check that it is a positive smi.
i++;
if (i >= array_length) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
Object* next_smi = fixed_array->get(i);
if (!next_smi->IsSmi()) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
pos = Smi::cast(next_smi)->value();
if (pos < 0) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
}
ASSERT(pos >= 0);
ASSERT(len >= 0);
if (pos > special_length || len > special_length - pos) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
increment = len;
} else if (elt->IsString()) {
String* element = String::cast(elt);
int element_length = element->length();
increment = element_length;
if (ascii && !element->HasOnlyAsciiChars()) {
ascii = false;
}
} else {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
if (increment > String::kMaxLength - position) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
position += increment;
}
int length = position;
Object* object;
if (ascii) {
{ MaybeObject* maybe_object =
isolate->heap()->AllocateRawAsciiString(length);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
SeqAsciiString* answer = SeqAsciiString::cast(object);
StringBuilderConcatHelper(special,
answer->GetChars(),
fixed_array,
array_length);
return answer;
} else {
{ MaybeObject* maybe_object =
isolate->heap()->AllocateRawTwoByteString(length);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
SeqTwoByteString* answer = SeqTwoByteString::cast(object);
StringBuilderConcatHelper(special,
answer->GetChars(),
fixed_array,
array_length);
return answer;
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringBuilderJoin) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_CHECKED(JSArray, array, args[0]);
if (!args[1]->IsSmi()) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
int array_length = Smi::cast(args[1])->value();
CONVERT_CHECKED(String, separator, args[2]);
if (!array->HasFastElements()) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
FixedArray* fixed_array = FixedArray::cast(array->elements());
if (fixed_array->length() < array_length) {
array_length = fixed_array->length();
}
if (array_length == 0) {
return isolate->heap()->empty_string();
} else if (array_length == 1) {
Object* first = fixed_array->get(0);
if (first->IsString()) return first;
}
int separator_length = separator->length();
int max_nof_separators =
(String::kMaxLength + separator_length - 1) / separator_length;
if (max_nof_separators < (array_length - 1)) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
int length = (array_length - 1) * separator_length;
for (int i = 0; i < array_length; i++) {
Object* element_obj = fixed_array->get(i);
if (!element_obj->IsString()) {
// TODO(1161): handle this case.
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
String* element = String::cast(element_obj);
int increment = element->length();
if (increment > String::kMaxLength - length) {
isolate->context()->mark_out_of_memory();
return Failure::OutOfMemoryException();
}
length += increment;
}
Object* object;
{ MaybeObject* maybe_object =
isolate->heap()->AllocateRawTwoByteString(length);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
SeqTwoByteString* answer = SeqTwoByteString::cast(object);
uc16* sink = answer->GetChars();
#ifdef DEBUG
uc16* end = sink + length;
#endif
String* first = String::cast(fixed_array->get(0));
int first_length = first->length();
String::WriteToFlat(first, sink, 0, first_length);
sink += first_length;
for (int i = 1; i < array_length; i++) {
ASSERT(sink + separator_length <= end);
String::WriteToFlat(separator, sink, 0, separator_length);
sink += separator_length;
String* element = String::cast(fixed_array->get(i));
int element_length = element->length();
ASSERT(sink + element_length <= end);
String::WriteToFlat(element, sink, 0, element_length);
sink += element_length;
}
ASSERT(sink == end);
ASSERT(!answer->HasOnlyAsciiChars()); // Use %_FastAsciiArrayJoin instead.
return answer;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberOr) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromInt32(x | y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberAnd) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromInt32(x & y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberXor) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromInt32(x ^ y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberNot) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
return isolate->heap()->NumberFromInt32(~x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberShl) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromInt32(x << (y & 0x1f));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberShr) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(uint32_t, x, Uint32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromUint32(x >> (y & 0x1f));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberSar) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_NUMBER_CHECKED(int32_t, x, Int32, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, y, Int32, args[1]);
return isolate->heap()->NumberFromInt32(ArithmeticShiftRight(x, y & 0x1f));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberEquals) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
if (isnan(x)) return Smi::FromInt(NOT_EQUAL);
if (isnan(y)) return Smi::FromInt(NOT_EQUAL);
if (x == y) return Smi::FromInt(EQUAL);
Object* result;
if ((fpclassify(x) == FP_ZERO) && (fpclassify(y) == FP_ZERO)) {
result = Smi::FromInt(EQUAL);
} else {
result = Smi::FromInt(NOT_EQUAL);
}
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringEquals) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, x, args[0]);
CONVERT_CHECKED(String, y, args[1]);
bool not_equal = !x->Equals(y);
// This is slightly convoluted because the value that signifies
// equality is 0 and inequality is 1 so we have to negate the result
// from String::Equals.
ASSERT(not_equal == 0 || not_equal == 1);
STATIC_CHECK(EQUAL == 0);
STATIC_CHECK(NOT_EQUAL == 1);
return Smi::FromInt(not_equal);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberCompare) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
if (isnan(x) || isnan(y)) return args[2];
if (x == y) return Smi::FromInt(EQUAL);
if (isless(x, y)) return Smi::FromInt(LESS);
return Smi::FromInt(GREATER);
}
// Compare two Smis as if they were converted to strings and then
// compared lexicographically.
RUNTIME_FUNCTION(MaybeObject*, Runtime_SmiLexicographicCompare) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
// Extract the integer values from the Smis.
CONVERT_CHECKED(Smi, x, args[0]);
CONVERT_CHECKED(Smi, y, args[1]);
int x_value = x->value();
int y_value = y->value();
// If the integers are equal so are the string representations.
if (x_value == y_value) return Smi::FromInt(EQUAL);
// If one of the integers are zero the normal integer order is the
// same as the lexicographic order of the string representations.
if (x_value == 0 || y_value == 0) return Smi::FromInt(x_value - y_value);
// If only one of the integers is negative the negative number is
// smallest because the char code of '-' is less than the char code
// of any digit. Otherwise, we make both values positive.
if (x_value < 0 || y_value < 0) {
if (y_value >= 0) return Smi::FromInt(LESS);
if (x_value >= 0) return Smi::FromInt(GREATER);
x_value = -x_value;
y_value = -y_value;
}
// Arrays for the individual characters of the two Smis. Smis are
// 31 bit integers and 10 decimal digits are therefore enough.
// TODO(isolates): maybe we should simply allocate 20 bytes on the stack.
int* x_elms = isolate->runtime_state()->smi_lexicographic_compare_x_elms();
int* y_elms = isolate->runtime_state()->smi_lexicographic_compare_y_elms();
// Convert the integers to arrays of their decimal digits.
int x_index = 0;
int y_index = 0;
while (x_value > 0) {
x_elms[x_index++] = x_value % 10;
x_value /= 10;
}
while (y_value > 0) {
y_elms[y_index++] = y_value % 10;
y_value /= 10;
}
// Loop through the arrays of decimal digits finding the first place
// where they differ.
while (--x_index >= 0 && --y_index >= 0) {
int diff = x_elms[x_index] - y_elms[y_index];
if (diff != 0) return Smi::FromInt(diff);
}
// If one array is a suffix of the other array, the longest array is
// the representation of the largest of the Smis in the
// lexicographic ordering.
return Smi::FromInt(x_index - y_index);
}
static Object* StringInputBufferCompare(RuntimeState* state,
String* x,
String* y) {
StringInputBuffer& bufx = *state->string_input_buffer_compare_bufx();
StringInputBuffer& bufy = *state->string_input_buffer_compare_bufy();
bufx.Reset(x);
bufy.Reset(y);
while (bufx.has_more() && bufy.has_more()) {
int d = bufx.GetNext() - bufy.GetNext();
if (d < 0) return Smi::FromInt(LESS);
else if (d > 0) return Smi::FromInt(GREATER);
}
// x is (non-trivial) prefix of y:
if (bufy.has_more()) return Smi::FromInt(LESS);
// y is prefix of x:
return Smi::FromInt(bufx.has_more() ? GREATER : EQUAL);
}
static Object* FlatStringCompare(String* x, String* y) {
ASSERT(x->IsFlat());
ASSERT(y->IsFlat());
Object* equal_prefix_result = Smi::FromInt(EQUAL);
int prefix_length = x->length();
if (y->length() < prefix_length) {
prefix_length = y->length();
equal_prefix_result = Smi::FromInt(GREATER);
} else if (y->length() > prefix_length) {
equal_prefix_result = Smi::FromInt(LESS);
}
int r;
if (x->IsAsciiRepresentation()) {
Vector<const char> x_chars = x->ToAsciiVector();
if (y->IsAsciiRepresentation()) {
Vector<const char> y_chars = y->ToAsciiVector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
} else {
Vector<const uc16> y_chars = y->ToUC16Vector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
}
} else {
Vector<const uc16> x_chars = x->ToUC16Vector();
if (y->IsAsciiRepresentation()) {
Vector<const char> y_chars = y->ToAsciiVector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
} else {
Vector<const uc16> y_chars = y->ToUC16Vector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
}
}
Object* result;
if (r == 0) {
result = equal_prefix_result;
} else {
result = (r < 0) ? Smi::FromInt(LESS) : Smi::FromInt(GREATER);
}
ASSERT(result ==
StringInputBufferCompare(Isolate::Current()->runtime_state(), x, y));
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StringCompare) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, x, args[0]);
CONVERT_CHECKED(String, y, args[1]);
isolate->counters()->string_compare_runtime()->Increment();
// A few fast case tests before we flatten.
if (x == y) return Smi::FromInt(EQUAL);
if (y->length() == 0) {
if (x->length() == 0) return Smi::FromInt(EQUAL);
return Smi::FromInt(GREATER);
} else if (x->length() == 0) {
return Smi::FromInt(LESS);
}
int d = x->Get(0) - y->Get(0);
if (d < 0) return Smi::FromInt(LESS);
else if (d > 0) return Smi::FromInt(GREATER);
Object* obj;
{ MaybeObject* maybe_obj = isolate->heap()->PrepareForCompare(x);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
{ MaybeObject* maybe_obj = isolate->heap()->PrepareForCompare(y);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
return (x->IsFlat() && y->IsFlat()) ? FlatStringCompare(x, y)
: StringInputBufferCompare(isolate->runtime_state(), x, y);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_acos) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_acos()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::ACOS, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_asin) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_asin()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::ASIN, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_atan) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_atan()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::ATAN, x);
}
static const double kPiDividedBy4 = 0.78539816339744830962;
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_atan2) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
isolate->counters()->math_atan2()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
double result;
if (isinf(x) && isinf(y)) {
// Make sure that the result in case of two infinite arguments
// is a multiple of Pi / 4. The sign of the result is determined
// by the first argument (x) and the sign of the second argument
// determines the multiplier: one or three.
int multiplier = (x < 0) ? -1 : 1;
if (y < 0) multiplier *= 3;
result = multiplier * kPiDividedBy4;
} else {
result = atan2(x, y);
}
return isolate->heap()->AllocateHeapNumber(result);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_ceil) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_ceil()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->heap()->NumberFromDouble(ceiling(x));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_cos) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_cos()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::COS, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_exp) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_exp()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::EXP, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_floor) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_floor()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->heap()->NumberFromDouble(floor(x));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_log) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_log()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::LOG, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
isolate->counters()->math_pow()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
// If the second argument is a smi, it is much faster to call the
// custom powi() function than the generic pow().
if (args[1]->IsSmi()) {
int y = Smi::cast(args[1])->value();
return isolate->heap()->NumberFromDouble(power_double_int(x, y));
}
CONVERT_DOUBLE_CHECKED(y, args[1]);
return isolate->heap()->AllocateHeapNumber(power_double_double(x, y));
}
// Fast version of Math.pow if we know that y is not an integer and
// y is not -0.5 or 0.5. Used as slowcase from codegen.
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow_cfunction) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(x, args[0]);
CONVERT_DOUBLE_CHECKED(y, args[1]);
if (y == 0) {
return Smi::FromInt(1);
} else if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) {
return isolate->heap()->nan_value();
} else {
return isolate->heap()->AllocateHeapNumber(pow(x, y));
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_RoundNumber) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_round()->Increment();
if (!args[0]->IsHeapNumber()) {
// Must be smi. Return the argument unchanged for all the other types
// to make fuzz-natives test happy.
return args[0];
}
HeapNumber* number = reinterpret_cast<HeapNumber*>(args[0]);
double value = number->value();
int exponent = number->get_exponent();
int sign = number->get_sign();
// We compare with kSmiValueSize - 3 because (2^30 - 0.1) has exponent 29 and
// should be rounded to 2^30, which is not smi.
if (!sign && exponent <= kSmiValueSize - 3) {
return Smi::FromInt(static_cast<int>(value + 0.5));
}
// If the magnitude is big enough, there's no place for fraction part. If we
// try to add 0.5 to this number, 1.0 will be added instead.
if (exponent >= 52) {
return number;
}
if (sign && value >= -0.5) return isolate->heap()->minus_zero_value();
// Do not call NumberFromDouble() to avoid extra checks.
return isolate->heap()->AllocateHeapNumber(floor(value + 0.5));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_sin) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_sin()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::SIN, x);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_sqrt) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_sqrt()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->heap()->AllocateHeapNumber(sqrt(x));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_tan) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
isolate->counters()->math_tan()->Increment();
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->transcendental_cache()->Get(TranscendentalCache::TAN, x);
}
static int MakeDay(int year, int month, int day) {
static const int day_from_month[] = {0, 31, 59, 90, 120, 151,
181, 212, 243, 273, 304, 334};
static const int day_from_month_leap[] = {0, 31, 60, 91, 121, 152,
182, 213, 244, 274, 305, 335};
year += month / 12;
month %= 12;
if (month < 0) {
year--;
month += 12;
}
ASSERT(month >= 0);
ASSERT(month < 12);
// year_delta is an arbitrary number such that:
// a) year_delta = -1 (mod 400)
// b) year + year_delta > 0 for years in the range defined by
// ECMA 262 - 15.9.1.1, i.e. upto 100,000,000 days on either side of
// Jan 1 1970. This is required so that we don't run into integer
// division of negative numbers.
// c) there shouldn't be an overflow for 32-bit integers in the following
// operations.
static const int year_delta = 399999;
static const int base_day = 365 * (1970 + year_delta) +
(1970 + year_delta) / 4 -
(1970 + year_delta) / 100 +
(1970 + year_delta) / 400;
int year1 = year + year_delta;
int day_from_year = 365 * year1 +
year1 / 4 -
year1 / 100 +
year1 / 400 -
base_day;
if (year % 4 || (year % 100 == 0 && year % 400 != 0)) {
return day_from_year + day_from_month[month] + day - 1;
}
return day_from_year + day_from_month_leap[month] + day - 1;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateMakeDay) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_SMI_CHECKED(year, args[0]);
CONVERT_SMI_CHECKED(month, args[1]);
CONVERT_SMI_CHECKED(date, args[2]);
return Smi::FromInt(MakeDay(year, month, date));
}
static const int kDays4Years[] = {0, 365, 2 * 365, 3 * 365 + 1};
static const int kDaysIn4Years = 4 * 365 + 1;
static const int kDaysIn100Years = 25 * kDaysIn4Years - 1;
static const int kDaysIn400Years = 4 * kDaysIn100Years + 1;
static const int kDays1970to2000 = 30 * 365 + 7;
static const int kDaysOffset = 1000 * kDaysIn400Years + 5 * kDaysIn400Years -
kDays1970to2000;
static const int kYearsOffset = 400000;
static const char kDayInYear[] = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31};
static const char kMonthInYear[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11};
// This function works for dates from 1970 to 2099.
static inline void DateYMDFromTimeAfter1970(int date,
int& year, int& month, int& day) {
#ifdef DEBUG
int save_date = date; // Need this for ASSERT in the end.
#endif
year = 1970 + (4 * date + 2) / kDaysIn4Years;
date %= kDaysIn4Years;
month = kMonthInYear[date];
day = kDayInYear[date];
ASSERT(MakeDay(year, month, day) == save_date);
}
static inline void DateYMDFromTimeSlow(int date,
int& year, int& month, int& day) {
#ifdef DEBUG
int save_date = date; // Need this for ASSERT in the end.
#endif
date += kDaysOffset;
year = 400 * (date / kDaysIn400Years) - kYearsOffset;
date %= kDaysIn400Years;
ASSERT(MakeDay(year, 0, 1) + date == save_date);
date--;
int yd1 = date / kDaysIn100Years;
date %= kDaysIn100Years;
year += 100 * yd1;
date++;
int yd2 = date / kDaysIn4Years;
date %= kDaysIn4Years;
year += 4 * yd2;
date--;
int yd3 = date / 365;
date %= 365;
year += yd3;
bool is_leap = (!yd1 || yd2) && !yd3;
ASSERT(date >= -1);
ASSERT(is_leap || (date >= 0));
ASSERT((date < 365) || (is_leap && (date < 366)));
ASSERT(is_leap == ((year % 4 == 0) && (year % 100 || (year % 400 == 0))));
ASSERT(is_leap || ((MakeDay(year, 0, 1) + date) == save_date));
ASSERT(!is_leap || ((MakeDay(year, 0, 1) + date + 1) == save_date));
if (is_leap) {
day = kDayInYear[2*365 + 1 + date];
month = kMonthInYear[2*365 + 1 + date];
} else {
day = kDayInYear[date];
month = kMonthInYear[date];
}
ASSERT(MakeDay(year, month, day) == save_date);
}
static inline void DateYMDFromTime(int date,
int& year, int& month, int& day) {
if (date >= 0 && date < 32 * kDaysIn4Years) {
DateYMDFromTimeAfter1970(date, year, month, day);
} else {
DateYMDFromTimeSlow(date, year, month, day);
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateYMDFromTime) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(t, args[0]);
CONVERT_CHECKED(JSArray, res_array, args[1]);
int year, month, day;
DateYMDFromTime(static_cast<int>(floor(t / 86400000)), year, month, day);
RUNTIME_ASSERT(res_array->elements()->map() ==
isolate->heap()->fixed_array_map());
FixedArray* elms = FixedArray::cast(res_array->elements());
RUNTIME_ASSERT(elms->length() == 3);
elms->set(0, Smi::FromInt(year));
elms->set(1, Smi::FromInt(month));
elms->set(2, Smi::FromInt(day));
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewArgumentsFast) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
JSFunction* callee = JSFunction::cast(args[0]);
Object** parameters = reinterpret_cast<Object**>(args[1]);
const int length = Smi::cast(args[2])->value();
Object* result;
{ MaybeObject* maybe_result =
isolate->heap()->AllocateArgumentsObject(callee, length);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
// Allocate the elements if needed.
if (length > 0) {
// Allocate the fixed array.
Object* obj;
{ MaybeObject* maybe_obj = isolate->heap()->AllocateRawFixedArray(length);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
AssertNoAllocation no_gc;
FixedArray* array = reinterpret_cast<FixedArray*>(obj);
array->set_map(isolate->heap()->fixed_array_map());
array->set_length(length);
WriteBarrierMode mode = array->GetWriteBarrierMode(no_gc);
for (int i = 0; i < length; i++) {
array->set(i, *--parameters, mode);
}
JSObject::cast(result)->set_elements(FixedArray::cast(obj));
}
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewClosure) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(Context, context, 0);
CONVERT_ARG_CHECKED(SharedFunctionInfo, shared, 1);
CONVERT_BOOLEAN_CHECKED(pretenure, args[2]);
// Allocate global closures in old space and allocate local closures
// in new space. Additionally pretenure closures that are assigned
// directly to properties.
pretenure = pretenure || (context->global_context() == *context);
PretenureFlag pretenure_flag = pretenure ? TENURED : NOT_TENURED;
Handle<JSFunction> result =
isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
context,
pretenure_flag);
return *result;
}
static SmartPointer<Object**> GetNonBoundArguments(int bound_argc,
int* total_argc) {
// Find frame containing arguments passed to the caller.
JavaScriptFrameIterator it;
JavaScriptFrame* frame = it.frame();
List<JSFunction*> functions(2);
frame->GetFunctions(&functions);
if (functions.length() > 1) {
int inlined_frame_index = functions.length() - 1;
JSFunction* inlined_function = functions[inlined_frame_index];
int args_count = inlined_function->shared()->formal_parameter_count();
ScopedVector<SlotRef> args_slots(args_count);
SlotRef::ComputeSlotMappingForArguments(frame,
inlined_frame_index,
&args_slots);
*total_argc = bound_argc + args_count;
SmartPointer<Object**> param_data(NewArray<Object**>(*total_argc));
for (int i = 0; i < args_count; i++) {
Handle<Object> val = args_slots[i].GetValue();
param_data[bound_argc + i] = val.location();
}
return param_data;
} else {
it.AdvanceToArgumentsFrame();
frame = it.frame();
int args_count = frame->ComputeParametersCount();
*total_argc = bound_argc + args_count;
SmartPointer<Object**> param_data(NewArray<Object**>(*total_argc));
for (int i = 0; i < args_count; i++) {
Handle<Object> val = Handle<Object>(frame->GetParameter(i));
param_data[bound_argc + i] = val.location();
}
return param_data;
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewObjectFromBound) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
// First argument is a function to use as a constructor.
CONVERT_ARG_CHECKED(JSFunction, function, 0);
// Second argument is either null or an array of bound arguments.
Handle<FixedArray> bound_args;
int bound_argc = 0;
if (!args[1]->IsNull()) {
CONVERT_ARG_CHECKED(JSArray, params, 1);
RUNTIME_ASSERT(params->HasFastElements());
bound_args = Handle<FixedArray>(FixedArray::cast(params->elements()));
bound_argc = Smi::cast(params->length())->value();
}
int total_argc = 0;
SmartPointer<Object**> param_data =
GetNonBoundArguments(bound_argc, &total_argc);
for (int i = 0; i < bound_argc; i++) {
Handle<Object> val = Handle<Object>(bound_args->get(i));
param_data[i] = val.location();
}
bool exception = false;
Handle<Object> result =
Execution::New(function, total_argc, *param_data, &exception);
if (exception) {
return Failure::Exception();
}
ASSERT(!result.is_null());
return *result;
}
static void TrySettingInlineConstructStub(Isolate* isolate,
Handle<JSFunction> function) {
Handle<Object> prototype = isolate->factory()->null_value();
if (function->has_instance_prototype()) {
prototype = Handle<Object>(function->instance_prototype(), isolate);
}
if (function->shared()->CanGenerateInlineConstructor(*prototype)) {
ConstructStubCompiler compiler;
MaybeObject* code = compiler.CompileConstructStub(*function);
if (!code->IsFailure()) {
function->shared()->set_construct_stub(
Code::cast(code->ToObjectUnchecked()));
}
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewObject) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<Object> constructor = args.at<Object>(0);
// If the constructor isn't a proper function we throw a type error.
if (!constructor->IsJSFunction()) {
Vector< Handle<Object> > arguments = HandleVector(&constructor, 1);
Handle<Object> type_error =
isolate->factory()->NewTypeError("not_constructor", arguments);
return isolate->Throw(*type_error);
}
Handle<JSFunction> function = Handle<JSFunction>::cast(constructor);
// If function should not have prototype, construction is not allowed. In this
// case generated code bailouts here, since function has no initial_map.
if (!function->should_have_prototype()) {
Vector< Handle<Object> > arguments = HandleVector(&constructor, 1);
Handle<Object> type_error =
isolate->factory()->NewTypeError("not_constructor", arguments);
return isolate->Throw(*type_error);
}
#ifdef ENABLE_DEBUGGER_SUPPORT
Debug* debug = isolate->debug();
// Handle stepping into constructors if step into is active.
if (debug->StepInActive()) {
debug->HandleStepIn(function, Handle<Object>::null(), 0, true);
}
#endif
if (function->has_initial_map()) {
if (function->initial_map()->instance_type() == JS_FUNCTION_TYPE) {
// The 'Function' function ignores the receiver object when
// called using 'new' and creates a new JSFunction object that
// is returned. The receiver object is only used for error
// reporting if an error occurs when constructing the new
// JSFunction. FACTORY->NewJSObject() should not be used to
// allocate JSFunctions since it does not properly initialize
// the shared part of the function. Since the receiver is
// ignored anyway, we use the global object as the receiver
// instead of a new JSFunction object. This way, errors are
// reported the same way whether or not 'Function' is called
// using 'new'.
return isolate->context()->global();
}
}
// The function should be compiled for the optimization hints to be
// available. We cannot use EnsureCompiled because that forces a
// compilation through the shared function info which makes it
// impossible for us to optimize.
Handle<SharedFunctionInfo> shared(function->shared(), isolate);
if (!function->is_compiled()) CompileLazy(function, CLEAR_EXCEPTION);
if (!function->has_initial_map() &&
shared->IsInobjectSlackTrackingInProgress()) {
// The tracking is already in progress for another function. We can only
// track one initial_map at a time, so we force the completion before the
// function is called as a constructor for the first time.
shared->CompleteInobjectSlackTracking();
}
bool first_allocation = !shared->live_objects_may_exist();
Handle<JSObject> result = isolate->factory()->NewJSObject(function);
RETURN_IF_EMPTY_HANDLE(isolate, result);
// Delay setting the stub if inobject slack tracking is in progress.
if (first_allocation && !shared->IsInobjectSlackTrackingInProgress()) {
TrySettingInlineConstructStub(isolate, function);
}
isolate->counters()->constructed_objects()->Increment();
isolate->counters()->constructed_objects_runtime()->Increment();
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FinalizeInstanceSize) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
function->shared()->CompleteInobjectSlackTracking();
TrySettingInlineConstructStub(isolate, function);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_LazyCompile) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<JSFunction> function = args.at<JSFunction>(0);
#ifdef DEBUG
if (FLAG_trace_lazy && !function->shared()->is_compiled()) {
PrintF("[lazy: ");
function->PrintName();
PrintF("]\n");
}
#endif
// Compile the target function. Here we compile using CompileLazyInLoop in
// order to get the optimized version. This helps code like delta-blue
// that calls performance-critical routines through constructors. A
// constructor call doesn't use a CallIC, it uses a LoadIC followed by a
// direct call. Since the in-loop tracking takes place through CallICs
// this means that things called through constructors are never known to
// be in loops. We compile them as if they are in loops here just in case.
ASSERT(!function->is_compiled());
if (!CompileLazyInLoop(function, KEEP_EXCEPTION)) {
return Failure::Exception();
}
// All done. Return the compiled code.
ASSERT(function->is_compiled());
return function->code();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_LazyRecompile) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<JSFunction> function = args.at<JSFunction>(0);
// If the function is not optimizable or debugger is active continue using the
// code from the full compiler.
if (!function->shared()->code()->optimizable() ||
isolate->debug()->has_break_points()) {
if (FLAG_trace_opt) {
PrintF("[failed to optimize ");
function->PrintName();
PrintF(": is code optimizable: %s, is debugger enabled: %s]\n",
function->shared()->code()->optimizable() ? "T" : "F",
isolate->debug()->has_break_points() ? "T" : "F");
}
function->ReplaceCode(function->shared()->code());
return function->code();
}
if (CompileOptimized(function, AstNode::kNoNumber, CLEAR_EXCEPTION)) {
return function->code();
}
if (FLAG_trace_opt) {
PrintF("[failed to optimize ");
function->PrintName();
PrintF(": optimized compilation failed]\n");
}
function->ReplaceCode(function->shared()->code());
return function->code();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyDeoptimized) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
RUNTIME_ASSERT(args[0]->IsSmi());
Deoptimizer::BailoutType type =
static_cast<Deoptimizer::BailoutType>(Smi::cast(args[0])->value());
Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
ASSERT(isolate->heap()->IsAllocationAllowed());
int frames = deoptimizer->output_count();
deoptimizer->MaterializeHeapNumbers();
delete deoptimizer;
JavaScriptFrameIterator it(isolate);
JavaScriptFrame* frame = NULL;
for (int i = 0; i < frames - 1; i++) it.Advance();
frame = it.frame();
RUNTIME_ASSERT(frame->function()->IsJSFunction());
Handle<JSFunction> function(JSFunction::cast(frame->function()), isolate);
Handle<Object> arguments;
for (int i = frame->ComputeExpressionsCount() - 1; i >= 0; --i) {
if (frame->GetExpression(i) == isolate->heap()->arguments_marker()) {
if (arguments.is_null()) {
// FunctionGetArguments can't throw an exception, so cast away the
// doubt with an assert.
arguments = Handle<Object>(
Accessors::FunctionGetArguments(*function,
NULL)->ToObjectUnchecked());
ASSERT(*arguments != isolate->heap()->null_value());
ASSERT(*arguments != isolate->heap()->undefined_value());
}
frame->SetExpression(i, *arguments);
}
}
isolate->compilation_cache()->MarkForLazyOptimizing(function);
if (type == Deoptimizer::EAGER) {
RUNTIME_ASSERT(function->IsOptimized());
} else {
RUNTIME_ASSERT(!function->IsOptimized());
}
// Avoid doing too much work when running with --always-opt and keep
// the optimized code around.
if (FLAG_always_opt || type == Deoptimizer::LAZY) {
return isolate->heap()->undefined_value();
}
// Count the number of optimized activations of the function.
int activations = 0;
while (!it.done()) {
JavaScriptFrame* frame = it.frame();
if (frame->is_optimized() && frame->function() == *function) {
activations++;
}
it.Advance();
}
// TODO(kasperl): For now, we cannot support removing the optimized
// code when we have recursive invocations of the same function.
if (activations == 0) {
if (FLAG_trace_deopt) {
PrintF("[removing optimized code for: ");
function->PrintName();
PrintF("]\n");
}
function->ReplaceCode(function->shared()->code());
}
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyOSR) {
Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
delete deoptimizer;
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeoptimizeFunction) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
if (!function->IsOptimized()) return isolate->heap()->undefined_value();
Deoptimizer::DeoptimizeFunction(*function);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_OptimizeFunctionOnNextCall) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
if (!function->IsOptimizable()) return isolate->heap()->undefined_value();
function->MarkForLazyRecompilation();
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
// We're not prepared to handle a function with arguments object.
ASSERT(!function->shared()->scope_info()->HasArgumentsShadow());
// We have hit a back edge in an unoptimized frame for a function that was
// selected for on-stack replacement. Find the unoptimized code object.
Handle<Code> unoptimized(function->shared()->code(), isolate);
// Keep track of whether we've succeeded in optimizing.
bool succeeded = unoptimized->optimizable();
if (succeeded) {
// If we are trying to do OSR when there are already optimized
// activations of the function, it means (a) the function is directly or
// indirectly recursive and (b) an optimized invocation has been
// deoptimized so that we are currently in an unoptimized activation.
// Check for optimized activations of this function.
JavaScriptFrameIterator it(isolate);
while (succeeded && !it.done()) {
JavaScriptFrame* frame = it.frame();
succeeded = !frame->is_optimized() || frame->function() != *function;
it.Advance();
}
}
int ast_id = AstNode::kNoNumber;
if (succeeded) {
// The top JS function is this one, the PC is somewhere in the
// unoptimized code.
JavaScriptFrameIterator it(isolate);
JavaScriptFrame* frame = it.frame();
ASSERT(frame->function() == *function);
ASSERT(frame->LookupCode() == *unoptimized);
ASSERT(unoptimized->contains(frame->pc()));
// Use linear search of the unoptimized code's stack check table to find
// the AST id matching the PC.
Address start = unoptimized->instruction_start();
unsigned target_pc_offset = static_cast<unsigned>(frame->pc() - start);
Address table_cursor = start + unoptimized->stack_check_table_offset();
uint32_t table_length = Memory::uint32_at(table_cursor);
table_cursor += kIntSize;
for (unsigned i = 0; i < table_length; ++i) {
// Table entries are (AST id, pc offset) pairs.
uint32_t pc_offset = Memory::uint32_at(table_cursor + kIntSize);
if (pc_offset == target_pc_offset) {
ast_id = static_cast<int>(Memory::uint32_at(table_cursor));
break;
}
table_cursor += 2 * kIntSize;
}
ASSERT(ast_id != AstNode::kNoNumber);
if (FLAG_trace_osr) {
PrintF("[replacing on-stack at AST id %d in ", ast_id);
function->PrintName();
PrintF("]\n");
}
// Try to compile the optimized code. A true return value from
// CompileOptimized means that compilation succeeded, not necessarily
// that optimization succeeded.
if (CompileOptimized(function, ast_id, CLEAR_EXCEPTION) &&
function->IsOptimized()) {
DeoptimizationInputData* data = DeoptimizationInputData::cast(
function->code()->deoptimization_data());
if (data->OsrPcOffset()->value() >= 0) {
if (FLAG_trace_osr) {
PrintF("[on-stack replacement offset %d in optimized code]\n",
data->OsrPcOffset()->value());
}
ASSERT(data->OsrAstId()->value() == ast_id);
} else {
// We may never generate the desired OSR entry if we emit an
// early deoptimize.
succeeded = false;
}
} else {
succeeded = false;
}
}
// Revert to the original stack checks in the original unoptimized code.
if (FLAG_trace_osr) {
PrintF("[restoring original stack checks in ");
function->PrintName();
PrintF("]\n");
}
StackCheckStub check_stub;
Handle<Code> check_code = check_stub.GetCode();
Handle<Code> replacement_code = isolate->builtins()->OnStackReplacement();
Deoptimizer::RevertStackCheckCode(*unoptimized,
*check_code,
*replacement_code);
// Allow OSR only at nesting level zero again.
unoptimized->set_allow_osr_at_loop_nesting_level(0);
// If the optimization attempt succeeded, return the AST id tagged as a
// smi. This tells the builtin that we need to translate the unoptimized
// frame to an optimized one.
if (succeeded) {
ASSERT(function->code()->kind() == Code::OPTIMIZED_FUNCTION);
return Smi::FromInt(ast_id);
} else {
if (function->IsMarkedForLazyRecompilation()) {
function->ReplaceCode(function->shared()->code());
}
return Smi::FromInt(-1);
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetFunctionDelegate) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
RUNTIME_ASSERT(!args[0]->IsJSFunction());
return *Execution::GetFunctionDelegate(args.at<Object>(0));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetConstructorDelegate) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
RUNTIME_ASSERT(!args[0]->IsJSFunction());
return *Execution::GetConstructorDelegate(args.at<Object>(0));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewContext) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, function, args[0]);
int length = function->shared()->scope_info()->NumberOfContextSlots();
Object* result;
{ MaybeObject* maybe_result =
isolate->heap()->AllocateFunctionContext(length, function);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
isolate->set_context(Context::cast(result));
return result; // non-failure
}
MUST_USE_RESULT static MaybeObject* PushContextHelper(Isolate* isolate,
Object* object,
bool is_catch_context) {
// Convert the object to a proper JavaScript object.
Object* js_object = object;
if (!js_object->IsJSObject()) {
MaybeObject* maybe_js_object = js_object->ToObject();
if (!maybe_js_object->ToObject(&js_object)) {
if (!Failure::cast(maybe_js_object)->IsInternalError()) {
return maybe_js_object;
}
HandleScope scope(isolate);
Handle<Object> handle(object, isolate);
Handle<Object> result =
isolate->factory()->NewTypeError("with_expression",
HandleVector(&handle, 1));
return isolate->Throw(*result);
}
}
Object* result;
{ MaybeObject* maybe_result = isolate->heap()->AllocateWithContext(
isolate->context(), JSObject::cast(js_object), is_catch_context);
if (!maybe_result->ToObject(&result)) return maybe_result;
}
Context* context = Context::cast(result);
isolate->set_context(context);
return result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_PushContext) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
return PushContextHelper(isolate, args[0], false);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_PushCatchContext) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
return PushContextHelper(isolate, args[0], true);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeleteContextSlot) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(Context, context, 0);
CONVERT_ARG_CHECKED(String, name, 1);
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = FOLLOW_CHAINS;
Handle<Object> holder = context->Lookup(name, flags, &index, &attributes);
// If the slot was not found the result is true.
if (holder.is_null()) {
return isolate->heap()->true_value();
}
// If the slot was found in a context, it should be DONT_DELETE.
if (holder->IsContext()) {
return isolate->heap()->false_value();
}
// The slot was found in a JSObject, either a context extension object,
// the global object, or an arguments object. Try to delete it
// (respecting DONT_DELETE). For consistency with V8's usual behavior,
// which allows deleting all parameters in functions that mention
// 'arguments', we do this even for the case of slots found on an
// arguments object. The slot was found on an arguments object if the
// index is non-negative.
Handle<JSObject> object = Handle<JSObject>::cast(holder);
if (index >= 0) {
return object->DeleteElement(index, JSObject::NORMAL_DELETION);
} else {
return object->DeleteProperty(*name, JSObject::NORMAL_DELETION);
}
}
// A mechanism to return a pair of Object pointers in registers (if possible).
// How this is achieved is calling convention-dependent.
// All currently supported x86 compiles uses calling conventions that are cdecl
// variants where a 64-bit value is returned in two 32-bit registers
// (edx:eax on ia32, r1:r0 on ARM).
// In AMD-64 calling convention a struct of two pointers is returned in rdx:rax.
// In Win64 calling convention, a struct of two pointers is returned in memory,
// allocated by the caller, and passed as a pointer in a hidden first parameter.
#ifdef V8_HOST_ARCH_64_BIT
struct ObjectPair {
MaybeObject* x;
MaybeObject* y;
};
static inline ObjectPair MakePair(MaybeObject* x, MaybeObject* y) {
ObjectPair result = {x, y};
// Pointers x and y returned in rax and rdx, in AMD-x64-abi.
// In Win64 they are assigned to a hidden first argument.
return result;
}
#else
typedef uint64_t ObjectPair;
static inline ObjectPair MakePair(MaybeObject* x, MaybeObject* y) {
return reinterpret_cast<uint32_t>(x) |
(reinterpret_cast<ObjectPair>(y) << 32);
}
#endif
static inline MaybeObject* Unhole(Heap* heap,
MaybeObject* x,
PropertyAttributes attributes) {
ASSERT(!x->IsTheHole() || (attributes & READ_ONLY) != 0);
USE(attributes);
return x->IsTheHole() ? heap->undefined_value() : x;
}
static JSObject* ComputeReceiverForNonGlobal(Isolate* isolate,
JSObject* holder) {
ASSERT(!holder->IsGlobalObject());
Context* top = isolate->context();
// Get the context extension function.
JSFunction* context_extension_function =
top->global_context()->context_extension_function();
// If the holder isn't a context extension object, we just return it
// as the receiver. This allows arguments objects to be used as
// receivers, but only if they are put in the context scope chain
// explicitly via a with-statement.
Object* constructor = holder->map()->constructor();
if (constructor != context_extension_function) return holder;
// Fall back to using the global object as the receiver if the
// property turns out to be a local variable allocated in a context
// extension object - introduced via eval.
return top->global()->global_receiver();
}
static ObjectPair LoadContextSlotHelper(Arguments args,
Isolate* isolate,
bool throw_error) {
HandleScope scope(isolate);
ASSERT_EQ(2, args.length());
if (!args[0]->IsContext() || !args[1]->IsString()) {
return MakePair(isolate->ThrowIllegalOperation(), NULL);
}
Handle<Context> context = args.at<Context>(0);
Handle<String> name = args.at<String>(1);
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = FOLLOW_CHAINS;
Handle<Object> holder = context->Lookup(name, flags, &index, &attributes);
// If the index is non-negative, the slot has been found in a local
// variable or a parameter. Read it from the context object or the
// arguments object.
if (index >= 0) {
// If the "property" we were looking for is a local variable or an
// argument in a context, the receiver is the global object; see
// ECMA-262, 3rd., 10.1.6 and 10.2.3.
JSObject* receiver =
isolate->context()->global()->global_receiver();
MaybeObject* value = (holder->IsContext())
? Context::cast(*holder)->get(index)
: JSObject::cast(*holder)->GetElement(index);
return MakePair(Unhole(isolate->heap(), value, attributes), receiver);
}
// If the holder is found, we read the property from it.
if (!holder.is_null() && holder->IsJSObject()) {
ASSERT(Handle<JSObject>::cast(holder)->HasProperty(*name));
JSObject* object = JSObject::cast(*holder);
JSObject* receiver;
if (object->IsGlobalObject()) {
receiver = GlobalObject::cast(object)->global_receiver();
} else if (context->is_exception_holder(*holder)) {
receiver = isolate->context()->global()->global_receiver();
} else {
receiver = ComputeReceiverForNonGlobal(isolate, object);
}
// No need to unhole the value here. This is taken care of by the
// GetProperty function.
MaybeObject* value = object->GetProperty(*name);
return MakePair(value, receiver);
}
if (throw_error) {
// The property doesn't exist - throw exception.
Handle<Object> reference_error =
isolate->factory()->NewReferenceError("not_defined",
HandleVector(&name, 1));
return MakePair(isolate->Throw(*reference_error), NULL);
} else {
// The property doesn't exist - return undefined
return MakePair(isolate->heap()->undefined_value(),
isolate->heap()->undefined_value());
}
}
RUNTIME_FUNCTION(ObjectPair, Runtime_LoadContextSlot) {
return LoadContextSlotHelper(args, isolate, true);
}
RUNTIME_FUNCTION(ObjectPair, Runtime_LoadContextSlotNoReferenceError) {
return LoadContextSlotHelper(args, isolate, false);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StoreContextSlot) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
Handle<Object> value(args[0], isolate);
CONVERT_ARG_CHECKED(Context, context, 1);
CONVERT_ARG_CHECKED(String, name, 2);
CONVERT_SMI_CHECKED(strict_unchecked, args[3]);
RUNTIME_ASSERT(strict_unchecked == kStrictMode ||
strict_unchecked == kNonStrictMode);
StrictModeFlag strict_mode = static_cast<StrictModeFlag>(strict_unchecked);
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = FOLLOW_CHAINS;
Handle<Object> holder = context->Lookup(name, flags, &index, &attributes);
if (index >= 0) {
if (holder->IsContext()) {
// Ignore if read_only variable.
if ((attributes & READ_ONLY) == 0) {
// Context is a fixed array and set cannot fail.
Context::cast(*holder)->set(index, *value);
} else if (strict_mode == kStrictMode) {
// Setting read only property in strict mode.
Handle<Object> error =
isolate->factory()->NewTypeError("strict_cannot_assign",
HandleVector(&name, 1));
return isolate->Throw(*error);
}
} else {
ASSERT((attributes & READ_ONLY) == 0);
Handle<Object> result =
SetElement(Handle<JSObject>::cast(holder), index, value, strict_mode);
if (result.is_null()) {
ASSERT(isolate->has_pending_exception());
return Failure::Exception();
}
}
return *value;
}
// Slow case: The property is not in a FixedArray context.
// It is either in an JSObject extension context or it was not found.
Handle<JSObject> context_ext;
if (!holder.is_null()) {
// The property exists in the extension context.
context_ext = Handle<JSObject>::cast(holder);
} else {
// The property was not found.
ASSERT(attributes == ABSENT);
if (strict_mode == kStrictMode) {
// Throw in strict mode (assignment to undefined variable).
Handle<Object> error =
isolate->factory()->NewReferenceError(
"not_defined", HandleVector(&name, 1));
return isolate->Throw(*error);
}
// In non-strict mode, the property is stored in the global context.
attributes = NONE;
context_ext = Handle<JSObject>(isolate->context()->global());
}
// Set the property, but ignore if read_only variable on the context
// extension object itself.
if ((attributes & READ_ONLY) == 0 ||
(context_ext->GetLocalPropertyAttribute(*name) == ABSENT)) {
RETURN_IF_EMPTY_HANDLE(
isolate,
SetProperty(context_ext, name, value, NONE, strict_mode));
} else if (strict_mode == kStrictMode && (attributes & READ_ONLY) != 0) {
// Setting read only property in strict mode.
Handle<Object> error =
isolate->factory()->NewTypeError(
"strict_cannot_assign", HandleVector(&name, 1));
return isolate->Throw(*error);
}
return *value;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Throw) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
return isolate->Throw(args[0]);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ReThrow) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
return isolate->ReThrow(args[0]);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_PromoteScheduledException) {
ASSERT_EQ(0, args.length());
return isolate->PromoteScheduledException();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ThrowReferenceError) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<Object> name(args[0], isolate);
Handle<Object> reference_error =
isolate->factory()->NewReferenceError("not_defined",
HandleVector(&name, 1));
return isolate->Throw(*reference_error);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_StackGuard) {
ASSERT(args.length() == 0);
// First check if this is a real stack overflow.
if (isolate->stack_guard()->IsStackOverflow()) {
NoHandleAllocation na;
return isolate->StackOverflow();
}
return Execution::HandleStackGuardInterrupt();
}
// NOTE: These PrintXXX functions are defined for all builds (not just
// DEBUG builds) because we may want to be able to trace function
// calls in all modes.
static void PrintString(String* str) {
// not uncommon to have empty strings
if (str->length() > 0) {
SmartPointer<char> s =
str->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
PrintF("%s", *s);
}
}
static void PrintObject(Object* obj) {
if (obj->IsSmi()) {
PrintF("%d", Smi::cast(obj)->value());
} else if (obj->IsString() || obj->IsSymbol()) {
PrintString(String::cast(obj));
} else if (obj->IsNumber()) {
PrintF("%g", obj->Number());
} else if (obj->IsFailure()) {
PrintF("<failure>");
} else if (obj->IsUndefined()) {
PrintF("<undefined>");
} else if (obj->IsNull()) {
PrintF("<null>");
} else if (obj->IsTrue()) {
PrintF("<true>");
} else if (obj->IsFalse()) {
PrintF("<false>");
} else {
PrintF("%p", reinterpret_cast<void*>(obj));
}
}
static int StackSize() {
int n = 0;
for (JavaScriptFrameIterator it; !it.done(); it.Advance()) n++;
return n;
}
static void PrintTransition(Object* result) {
// indentation
{ const int nmax = 80;
int n = StackSize();
if (n <= nmax)
PrintF("%4d:%*s", n, n, "");
else
PrintF("%4d:%*s", n, nmax, "...");
}
if (result == NULL) {
// constructor calls
JavaScriptFrameIterator it;
JavaScriptFrame* frame = it.frame();
if (frame->IsConstructor()) PrintF("new ");
// function name
Object* fun = frame->function();
if (fun->IsJSFunction()) {
PrintObject(JSFunction::cast(fun)->shared()->name());
} else {
PrintObject(fun);
}
// function arguments
// (we are intentionally only printing the actually
// supplied parameters, not all parameters required)
PrintF("(this=");
PrintObject(frame->receiver());
const int length = frame->ComputeParametersCount();
for (int i = 0; i < length; i++) {
PrintF(", ");
PrintObject(frame->GetParameter(i));
}
PrintF(") {\n");
} else {
// function result
PrintF("} -> ");
PrintObject(result);
PrintF("\n");
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_TraceEnter) {
ASSERT(args.length() == 0);
NoHandleAllocation ha;
PrintTransition(NULL);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_TraceExit) {
NoHandleAllocation ha;
PrintTransition(args[0]);
return args[0]; // return TOS
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPrint) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
#ifdef DEBUG
if (args[0]->IsString()) {
// If we have a string, assume it's a code "marker"
// and print some interesting cpu debugging info.
JavaScriptFrameIterator it(isolate);
JavaScriptFrame* frame = it.frame();
PrintF("fp = %p, sp = %p, caller_sp = %p: ",
frame->fp(), frame->sp(), frame->caller_sp());
} else {
PrintF("DebugPrint: ");
}
args[0]->Print();
if (args[0]->IsHeapObject()) {
PrintF("\n");
HeapObject::cast(args[0])->map()->Print();
}
#else
// ShortPrint is available in release mode. Print is not.
args[0]->ShortPrint();
#endif
PrintF("\n");
Flush();
return args[0]; // return TOS
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugTrace) {
ASSERT(args.length() == 0);
NoHandleAllocation ha;
isolate->PrintStack();
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateCurrentTime) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
// According to ECMA-262, section 15.9.1, page 117, the precision of
// the number in a Date object representing a particular instant in
// time is milliseconds. Therefore, we floor the result of getting
// the OS time.
double millis = floor(OS::TimeCurrentMillis());
return isolate->heap()->NumberFromDouble(millis);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateParseString) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(String, str, 0);
FlattenString(str);
CONVERT_ARG_CHECKED(JSArray, output, 1);
RUNTIME_ASSERT(output->HasFastElements());
AssertNoAllocation no_allocation;
FixedArray* output_array = FixedArray::cast(output->elements());
RUNTIME_ASSERT(output_array->length() >= DateParser::OUTPUT_SIZE);
bool result;
if (str->IsAsciiRepresentation()) {
result = DateParser::Parse(str->ToAsciiVector(),
output_array,
isolate->unicode_cache());
} else {
ASSERT(str->IsTwoByteRepresentation());
result = DateParser::Parse(str->ToUC16Vector(),
output_array,
isolate->unicode_cache());
}
if (result) {
return *output;
} else {
return isolate->heap()->null_value();
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateLocalTimezone) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(x, args[0]);
const char* zone = OS::LocalTimezone(x);
return isolate->heap()->AllocateStringFromUtf8(CStrVector(zone));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateLocalTimeOffset) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
return isolate->heap()->NumberFromDouble(OS::LocalTimeOffset());
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DateDaylightSavingsOffset) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_DOUBLE_CHECKED(x, args[0]);
return isolate->heap()->NumberFromDouble(OS::DaylightSavingsOffset(x));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GlobalReceiver) {
ASSERT(args.length() == 1);
Object* global = args[0];
if (!global->IsJSGlobalObject()) return isolate->heap()->null_value();
return JSGlobalObject::cast(global)->global_receiver();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ParseJson) {
HandleScope scope(isolate);
ASSERT_EQ(1, args.length());
CONVERT_ARG_CHECKED(String, source, 0);
Handle<Object> result = JsonParser::Parse(source);
if (result.is_null()) {
// Syntax error or stack overflow in scanner.
ASSERT(isolate->has_pending_exception());
return Failure::Exception();
}
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
HandleScope scope(isolate);
ASSERT_EQ(1, args.length());
CONVERT_ARG_CHECKED(String, source, 0);
// Compile source string in the global context.
Handle<Context> context(isolate->context()->global_context());
Handle<SharedFunctionInfo> shared = Compiler::CompileEval(source,
context,
true,
kNonStrictMode);
if (shared.is_null()) return Failure::Exception();
Handle<JSFunction> fun =
isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
context,
NOT_TENURED);
return *fun;
}
static ObjectPair CompileGlobalEval(Isolate* isolate,
Handle<String> source,
Handle<Object> receiver,
StrictModeFlag strict_mode) {
// Deal with a normal eval call with a string argument. Compile it
// and return the compiled function bound in the local context.
Handle<SharedFunctionInfo> shared = Compiler::CompileEval(
source,
Handle<Context>(isolate->context()),
isolate->context()->IsGlobalContext(),
strict_mode);
if (shared.is_null()) return MakePair(Failure::Exception(), NULL);
Handle<JSFunction> compiled =
isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared, Handle<Context>(isolate->context()), NOT_TENURED);
return MakePair(*compiled, *receiver);
}
RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
ASSERT(args.length() == 4);
HandleScope scope(isolate);
Handle<Object> callee = args.at<Object>(0);
Handle<Object> receiver; // Will be overwritten.
// Compute the calling context.
Handle<Context> context = Handle<Context>(isolate->context(), isolate);
#ifdef DEBUG
// Make sure Isolate::context() agrees with the old code that traversed
// the stack frames to compute the context.
StackFrameLocator locator;
JavaScriptFrame* frame = locator.FindJavaScriptFrame(0);
ASSERT(Context::cast(frame->context()) == *context);
#endif
// Find where the 'eval' symbol is bound. It is unaliased only if
// it is bound in the global context.
int index = -1;
PropertyAttributes attributes = ABSENT;
while (true) {
receiver = context->Lookup(isolate->factory()->eval_symbol(),
FOLLOW_PROTOTYPE_CHAIN,
&index, &attributes);
// Stop search when eval is found or when the global context is
// reached.
if (attributes != ABSENT || context->IsGlobalContext()) break;
if (context->is_function_context()) {
context = Handle<Context>(Context::cast(context->closure()->context()),
isolate);
} else {
context = Handle<Context>(context->previous(), isolate);
}
}
// If eval could not be resolved, it has been deleted and we need to
// throw a reference error.
if (attributes == ABSENT) {
Handle<Object> name = isolate->factory()->eval_symbol();
Handle<Object> reference_error =
isolate->factory()->NewReferenceError("not_defined",
HandleVector(&name, 1));
return MakePair(isolate->Throw(*reference_error), NULL);
}
if (!context->IsGlobalContext()) {
// 'eval' is not bound in the global context. Just call the function
// with the given arguments. This is not necessarily the global eval.
if (receiver->IsContext()) {
context = Handle<Context>::cast(receiver);
receiver = Handle<Object>(context->get(index), isolate);
} else if (receiver->IsJSContextExtensionObject()) {
receiver = Handle<JSObject>(
isolate->context()->global()->global_receiver(), isolate);
}
return MakePair(*callee, *receiver);
}
// 'eval' is bound in the global context, but it may have been overwritten.
// Compare it to the builtin 'GlobalEval' function to make sure.
if (*callee != isolate->global_context()->global_eval_fun() ||
!args[1]->IsString()) {
return MakePair(*callee,
isolate->context()->global()->global_receiver());
}
ASSERT(args[3]->IsSmi());
return CompileGlobalEval(isolate,
args.at<String>(1),
args.at<Object>(2),
static_cast<StrictModeFlag>(
Smi::cast(args[3])->value()));
}
RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEvalNoLookup) {
ASSERT(args.length() == 4);
HandleScope scope(isolate);
Handle<Object> callee = args.at<Object>(0);
// 'eval' is bound in the global context, but it may have been overwritten.
// Compare it to the builtin 'GlobalEval' function to make sure.
if (*callee != isolate->global_context()->global_eval_fun() ||
!args[1]->IsString()) {
return MakePair(*callee,
isolate->context()->global()->global_receiver());
}
ASSERT(args[3]->IsSmi());
return CompileGlobalEval(isolate,
args.at<String>(1),
args.at<Object>(2),
static_cast<StrictModeFlag>(
Smi::cast(args[3])->value()));
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetNewFunctionAttributes) {
// This utility adjusts the property attributes for newly created Function
// object ("new Function(...)") by changing the map.
// All it does is changing the prototype property to enumerable
// as specified in ECMA262, 15.3.5.2.
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, func, 0);
Handle<Map> map = func->shared()->strict_mode()
? isolate->strict_mode_function_instance_map()
: isolate->function_instance_map();
ASSERT(func->map()->instance_type() == map->instance_type());
ASSERT(func->map()->instance_size() == map->instance_size());
func->set_map(*map);
return *func;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInNewSpace) {
// Allocate a block of memory in NewSpace (filled with a filler).
// Use as fallback for allocation in generated code when NewSpace
// is full.
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(Smi, size_smi, 0);
int size = size_smi->value();
RUNTIME_ASSERT(IsAligned(size, kPointerSize));
RUNTIME_ASSERT(size > 0);
Heap* heap = isolate->heap();
const int kMinFreeNewSpaceAfterGC = heap->InitialSemiSpaceSize() * 3/4;
RUNTIME_ASSERT(size <= kMinFreeNewSpaceAfterGC);
Object* allocation;
{ MaybeObject* maybe_allocation = heap->new_space()->AllocateRaw(size);
if (maybe_allocation->ToObject(&allocation)) {
heap->CreateFillerObjectAt(HeapObject::cast(allocation)->address(), size);
}
return maybe_allocation;
}
}
// Push an object unto an array of objects if it is not already in the
// array. Returns true if the element was pushed on the stack and
// false otherwise.
RUNTIME_FUNCTION(MaybeObject*, Runtime_PushIfAbsent) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSArray, array, args[0]);
CONVERT_CHECKED(JSObject, element, args[1]);
RUNTIME_ASSERT(array->HasFastElements());
int length = Smi::cast(array->length())->value();
FixedArray* elements = FixedArray::cast(array->elements());
for (int i = 0; i < length; i++) {
if (elements->get(i) == element) return isolate->heap()->false_value();
}
Object* obj;
// Strict not needed. Used for cycle detection in Array join implementation.
{ MaybeObject* maybe_obj = array->SetFastElement(length, element,
kNonStrictMode);
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
return isolate->heap()->true_value();
}
/**
* A simple visitor visits every element of Array's.
* The backend storage can be a fixed array for fast elements case,
* or a dictionary for sparse array. Since Dictionary is a subtype
* of FixedArray, the class can be used by both fast and slow cases.
* The second parameter of the constructor, fast_elements, specifies
* whether the storage is a FixedArray or Dictionary.
*
* An index limit is used to deal with the situation that a result array
* length overflows 32-bit non-negative integer.
*/
class ArrayConcatVisitor {
public:
ArrayConcatVisitor(Isolate* isolate,
Handle<FixedArray> storage,
bool fast_elements) :
isolate_(isolate),
storage_(Handle<FixedArray>::cast(
isolate->global_handles()->Create(*storage))),
index_offset_(0u),
fast_elements_(fast_elements) { }
~ArrayConcatVisitor() {
clear_storage();
}
void visit(uint32_t i, Handle<Object> elm) {
if (i >= JSObject::kMaxElementCount - index_offset_) return;
uint32_t index = index_offset_ + i;
if (fast_elements_) {
if (index < static_cast<uint32_t>(storage_->length())) {
storage_->set(index, *elm);
return;
}
// Our initial estimate of length was foiled, possibly by
// getters on the arrays increasing the length of later arrays
// during iteration.
// This shouldn't happen in anything but pathological cases.
SetDictionaryMode(index);
// Fall-through to dictionary mode.
}
ASSERT(!fast_elements_);
Handle<NumberDictionary> dict(NumberDictionary::cast(*storage_));
Handle<NumberDictionary> result =
isolate_->factory()->DictionaryAtNumberPut(dict, index, elm);
if (!result.is_identical_to(dict)) {
// Dictionary needed to grow.
clear_storage();
set_storage(*result);
}
}
void increase_index_offset(uint32_t delta) {
if (JSObject::kMaxElementCount - index_offset_ < delta) {
index_offset_ = JSObject::kMaxElementCount;
} else {
index_offset_ += delta;
}
}
Handle<JSArray> ToArray() {
Handle<JSArray> array = isolate_->factory()->NewJSArray(0);
Handle<Object> length =
isolate_->factory()->NewNumber(static_cast<double>(index_offset_));
Handle<Map> map;
if (fast_elements_) {
map = isolate_->factory()->GetFastElementsMap(Handle<Map>(array->map()));
} else {
map = isolate_->factory()->GetSlowElementsMap(Handle<Map>(array->map()));
}
array->set_map(*map);
array->set_length(*length);
array->set_elements(*storage_);
return array;
}
private:
// Convert storage to dictionary mode.
void SetDictionaryMode(uint32_t index) {
ASSERT(fast_elements_);
Handle<FixedArray> current_storage(*storage_);
Handle<NumberDictionary> slow_storage(
isolate_->factory()->NewNumberDictionary(current_storage->length()));
uint32_t current_length = static_cast<uint32_t>(current_storage->length());
for (uint32_t i = 0; i < current_length; i++) {
HandleScope loop_scope;
Handle<Object> element(current_storage->get(i));
if (!element->IsTheHole()) {
Handle<NumberDictionary> new_storage =
isolate_->factory()->DictionaryAtNumberPut(slow_storage, i, element);
if (!new_storage.is_identical_to(slow_storage)) {
slow_storage = loop_scope.CloseAndEscape(new_storage);
}
}
}
clear_storage();
set_storage(*slow_storage);
fast_elements_ = false;
}
inline void clear_storage() {
isolate_->global_handles()->Destroy(
Handle<Object>::cast(storage_).location());
}
inline void set_storage(FixedArray* storage) {
storage_ = Handle<FixedArray>::cast(
isolate_->global_handles()->Create(storage));
}
Isolate* isolate_;
Handle<FixedArray> storage_; // Always a global handle.
// Index after last seen index. Always less than or equal to
// JSObject::kMaxElementCount.
uint32_t index_offset_;
bool fast_elements_;
};
static uint32_t EstimateElementCount(Handle<JSArray> array) {
uint32_t length = static_cast<uint32_t>(array->length()->Number());
int element_count = 0;
switch (array->GetElementsKind()) {
case JSObject::FAST_ELEMENTS: {
// Fast elements can't have lengths that are not representable by
// a 32-bit signed integer.
ASSERT(static_cast<int32_t>(FixedArray::kMaxLength) >= 0);
int fast_length = static_cast<int>(length);
Handle<FixedArray> elements(FixedArray::cast(array->elements()));
for (int i = 0; i < fast_length; i++) {
if (!elements->get(i)->IsTheHole()) element_count++;
}
break;
}
case JSObject::DICTIONARY_ELEMENTS: {
Handle<NumberDictionary> dictionary(
NumberDictionary::cast(array->elements()));
int capacity = dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Handle<Object> key(dictionary->KeyAt(i));
if (dictionary->IsKey(*key)) {
element_count++;
}
}
break;
}
default:
// External arrays are always dense.
return length;
}
// As an estimate, we assume that the prototype doesn't contain any
// inherited elements.
return element_count;
}
template<class ExternalArrayClass, class ElementType>
static void IterateExternalArrayElements(Isolate* isolate,
Handle<JSObject> receiver,
bool elements_are_ints,
bool elements_are_guaranteed_smis,
ArrayConcatVisitor* visitor) {
Handle<ExternalArrayClass> array(
ExternalArrayClass::cast(receiver->elements()));
uint32_t len = static_cast<uint32_t>(array->length());
ASSERT(visitor != NULL);
if (elements_are_ints) {
if (elements_are_guaranteed_smis) {
for (uint32_t j = 0; j < len; j++) {
HandleScope loop_scope;
Handle<Smi> e(Smi::FromInt(static_cast<int>(array->get(j))));
visitor->visit(j, e);
}
} else {
for (uint32_t j = 0; j < len; j++) {
HandleScope loop_scope;
int64_t val = static_cast<int64_t>(array->get(j));
if (Smi::IsValid(static_cast<intptr_t>(val))) {
Handle<Smi> e(Smi::FromInt(static_cast<int>(val)));
visitor->visit(j, e);
} else {
Handle<Object> e =
isolate->factory()->NewNumber(static_cast<ElementType>(val));
visitor->visit(j, e);
}
}
}
} else {
for (uint32_t j = 0; j < len; j++) {
HandleScope loop_scope(isolate);
Handle<Object> e = isolate->factory()->NewNumber(array->get(j));
visitor->visit(j, e);
}
}
}
// Used for sorting indices in a List<uint32_t>.
static int compareUInt32(const uint32_t* ap, const uint32_t* bp) {
uint32_t a = *ap;
uint32_t b = *bp;
return (a == b) ? 0 : (a < b) ? -1 : 1;
}
static void CollectElementIndices(Handle<JSObject> object,
uint32_t range,
List<uint32_t>* indices) {
JSObject::ElementsKind kind = object->GetElementsKind();
switch (kind) {
case JSObject::FAST_ELEMENTS: {
Handle<FixedArray> elements(FixedArray::cast(object->elements()));
uint32_t length = static_cast<uint32_t>(elements->length());
if (range < length) length = range;
for (uint32_t i = 0; i < length; i++) {
if (!elements->get(i)->IsTheHole()) {
indices->Add(i);
}
}
break;
}
case JSObject::DICTIONARY_ELEMENTS: {
Handle<NumberDictionary> dict(NumberDictionary::cast(object->elements()));
uint32_t capacity = dict->Capacity();
for (uint32_t j = 0; j < capacity; j++) {
HandleScope loop_scope;
Handle<Object> k(dict->KeyAt(j));
if (dict->IsKey(*k)) {
ASSERT(k->IsNumber());
uint32_t index = static_cast<uint32_t>(k->Number());
if (index < range) {
indices->Add(index);
}
}
}
break;
}
default: {
int dense_elements_length;
switch (kind) {
case JSObject::EXTERNAL_PIXEL_ELEMENTS: {
dense_elements_length =
ExternalPixelArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_BYTE_ELEMENTS: {
dense_elements_length =
ExternalByteArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_UNSIGNED_BYTE_ELEMENTS: {
dense_elements_length =
ExternalUnsignedByteArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_SHORT_ELEMENTS: {
dense_elements_length =
ExternalShortArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_UNSIGNED_SHORT_ELEMENTS: {
dense_elements_length =
ExternalUnsignedShortArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_INT_ELEMENTS: {
dense_elements_length =
ExternalIntArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_UNSIGNED_INT_ELEMENTS: {
dense_elements_length =
ExternalUnsignedIntArray::cast(object->elements())->length();
break;
}
case JSObject::EXTERNAL_FLOAT_ELEMENTS: {
dense_elements_length =
ExternalFloatArray::cast(object->elements())->length();
break;
}
default:
UNREACHABLE();
dense_elements_length = 0;
break;
}
uint32_t length = static_cast<uint32_t>(dense_elements_length);
if (range <= length) {
length = range;
// We will add all indices, so we might as well clear it first
// and avoid duplicates.
indices->Clear();
}
for (uint32_t i = 0; i < length; i++) {
indices->Add(i);
}
if (length == range) return; // All indices accounted for already.
break;
}
}
Handle<Object> prototype(object->GetPrototype());
if (prototype->IsJSObject()) {
// The prototype will usually have no inherited element indices,
// but we have to check.
CollectElementIndices(Handle<JSObject>::cast(prototype), range, indices);
}
}
/**
* A helper function that visits elements of a JSArray in numerical
* order.
*
* The visitor argument called for each existing element in the array
* with the element index and the element's value.
* Afterwards it increments the base-index of the visitor by the array
* length.
* Returns false if any access threw an exception, otherwise true.
*/
static bool IterateElements(Isolate* isolate,
Handle<JSArray> receiver,
ArrayConcatVisitor* visitor) {
uint32_t length = static_cast<uint32_t>(receiver->length()->Number());
switch (receiver->GetElementsKind()) {
case JSObject::FAST_ELEMENTS: {
// Run through the elements FixedArray and use HasElement and GetElement
// to check the prototype for missing elements.
Handle<FixedArray> elements(FixedArray::cast(receiver->elements()));
int fast_length = static_cast<int>(length);
ASSERT(fast_length <= elements->length());
for (int j = 0; j < fast_length; j++) {
HandleScope loop_scope(isolate);
Handle<Object> element_value(elements->get(j), isolate);
if (!element_value->IsTheHole()) {
visitor->visit(j, element_value);
} else if (receiver->HasElement(j)) {
// Call GetElement on receiver, not its prototype, or getters won't
// have the correct receiver.
element_value = GetElement(receiver, j);
if (element_value.is_null()) return false;
visitor->visit(j, element_value);
}
}
break;
}
case JSObject::DICTIONARY_ELEMENTS: {
Handle<NumberDictionary> dict(receiver->element_dictionary());
List<uint32_t> indices(dict->Capacity() / 2);
// Collect all indices in the object and the prototypes less
// than length. This might introduce duplicates in the indices list.
CollectElementIndices(receiver, length, &indices);
indices.Sort(&compareUInt32);
int j = 0;
int n = indices.length();
while (j < n) {
HandleScope loop_scope;
uint32_t index = indices[j];
Handle<Object> element = GetElement(receiver, index);
if (element.is_null()) return false;
visitor->visit(index, element);
// Skip to next different index (i.e., omit duplicates).
do {
j++;
} while (j < n && indices[j] == index);
}
break;
}
case JSObject::EXTERNAL_PIXEL_ELEMENTS: {
Handle<ExternalPixelArray> pixels(ExternalPixelArray::cast(
receiver->elements()));
for (uint32_t j = 0; j < length; j++) {
Handle<Smi> e(Smi::FromInt(pixels->get(j)));
visitor->visit(j, e);
}
break;
}
case JSObject::EXTERNAL_BYTE_ELEMENTS: {
IterateExternalArrayElements<ExternalByteArray, int8_t>(
isolate, receiver, true, true, visitor);
break;
}
case JSObject::EXTERNAL_UNSIGNED_BYTE_ELEMENTS: {
IterateExternalArrayElements<ExternalUnsignedByteArray, uint8_t>(
isolate, receiver, true, true, visitor);
break;
}
case JSObject::EXTERNAL_SHORT_ELEMENTS: {
IterateExternalArrayElements<ExternalShortArray, int16_t>(
isolate, receiver, true, true, visitor);
break;
}
case JSObject::EXTERNAL_UNSIGNED_SHORT_ELEMENTS: {
IterateExternalArrayElements<ExternalUnsignedShortArray, uint16_t>(
isolate, receiver, true, true, visitor);
break;
}
case JSObject::EXTERNAL_INT_ELEMENTS: {
IterateExternalArrayElements<ExternalIntArray, int32_t>(
isolate, receiver, true, false, visitor);
break;
}
case JSObject::EXTERNAL_UNSIGNED_INT_ELEMENTS: {
IterateExternalArrayElements<ExternalUnsignedIntArray, uint32_t>(
isolate, receiver, true, false, visitor);
break;
}
case JSObject::EXTERNAL_FLOAT_ELEMENTS: {
IterateExternalArrayElements<ExternalFloatArray, float>(
isolate, receiver, false, false, visitor);
break;
}
default:
UNREACHABLE();
break;
}
visitor->increase_index_offset(length);
return true;
}
/**
* Array::concat implementation.
* See ECMAScript 262, 15.4.4.4.
* TODO(581): Fix non-compliance for very large concatenations and update to
* following the ECMAScript 5 specification.
*/
RUNTIME_FUNCTION(MaybeObject*, Runtime_ArrayConcat) {
ASSERT(args.length() == 1);
HandleScope handle_scope(isolate);
CONVERT_ARG_CHECKED(JSArray, arguments, 0);
int argument_count = static_cast<int>(arguments->length()->Number());
RUNTIME_ASSERT(arguments->HasFastElements());
Handle<FixedArray> elements(FixedArray::cast(arguments->elements()));
// Pass 1: estimate the length and number of elements of the result.
// The actual length can be larger if any of the arguments have getters
// that mutate other arguments (but will otherwise be precise).
// The number of elements is precise if there are no inherited elements.
uint32_t estimate_result_length = 0;
uint32_t estimate_nof_elements = 0;
{
for (int i = 0; i < argument_count; i++) {
HandleScope loop_scope;
Handle<Object> obj(elements->get(i));
uint32_t length_estimate;
uint32_t element_estimate;
if (obj->IsJSArray()) {
Handle<JSArray> array(Handle<JSArray>::cast(obj));
length_estimate =
static_cast<uint32_t>(array->length()->Number());
element_estimate =
EstimateElementCount(array);
} else {
length_estimate = 1;
element_estimate = 1;
}
// Avoid overflows by capping at kMaxElementCount.
if (JSObject::kMaxElementCount - estimate_result_length <
length_estimate) {
estimate_result_length = JSObject::kMaxElementCount;
} else {
estimate_result_length += length_estimate;
}
if (JSObject::kMaxElementCount - estimate_nof_elements <
element_estimate) {
estimate_nof_elements = JSObject::kMaxElementCount;
} else {
estimate_nof_elements += element_estimate;
}
}
}
// If estimated number of elements is more than half of length, a
// fixed array (fast case) is more time and space-efficient than a
// dictionary.
bool fast_case = (estimate_nof_elements * 2) >= estimate_result_length;
Handle<FixedArray> storage;
if (fast_case) {
// The backing storage array must have non-existing elements to
// preserve holes across concat operations.
storage = isolate->factory()->NewFixedArrayWithHoles(
estimate_result_length);
} else {
// TODO(126): move 25% pre-allocation logic into Dictionary::Allocate
uint32_t at_least_space_for = estimate_nof_elements +
(estimate_nof_elements >> 2);
storage = Handle<FixedArray>::cast(
isolate->factory()->NewNumberDictionary(at_least_space_for));
}
ArrayConcatVisitor visitor(isolate, storage, fast_case);
for (int i = 0; i < argument_count; i++) {
Handle<Object> obj(elements->get(i));
if (obj->IsJSArray()) {
Handle<JSArray> array = Handle<JSArray>::cast(obj);
if (!IterateElements(isolate, array, &visitor)) {
return Failure::Exception();
}
} else {
visitor.visit(0, obj);
visitor.increase_index_offset(1);
}
}
return *visitor.ToArray();
}
// This will not allocate (flatten the string), but it may run
// very slowly for very deeply nested ConsStrings. For debugging use only.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GlobalPrint) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, string, args[0]);
StringInputBuffer buffer(string);
while (buffer.has_more()) {
uint16_t character = buffer.GetNext();
PrintF("%c", character);
}
return string;
}
// Moves all own elements of an object, that are below a limit, to positions
// starting at zero. All undefined values are placed after non-undefined values,
// and are followed by non-existing element. Does not change the length
// property.
// Returns the number of non-undefined elements collected.
RUNTIME_FUNCTION(MaybeObject*, Runtime_RemoveArrayHoles) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSObject, object, args[0]);
CONVERT_NUMBER_CHECKED(uint32_t, limit, Uint32, args[1]);
return object->PrepareElementsForSort(limit);
}
// Move contents of argument 0 (an array) to argument 1 (an array)
RUNTIME_FUNCTION(MaybeObject*, Runtime_MoveArrayContents) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSArray, from, args[0]);
CONVERT_CHECKED(JSArray, to, args[1]);
HeapObject* new_elements = from->elements();
MaybeObject* maybe_new_map;
if (new_elements->map() == isolate->heap()->fixed_array_map() ||
new_elements->map() == isolate->heap()->fixed_cow_array_map()) {
maybe_new_map = to->map()->GetFastElementsMap();
} else {
maybe_new_map = to->map()->GetSlowElementsMap();
}
Object* new_map;
if (!maybe_new_map->ToObject(&new_map)) return maybe_new_map;
to->set_map(Map::cast(new_map));
to->set_elements(new_elements);
to->set_length(from->length());
Object* obj;
{ MaybeObject* maybe_obj = from->ResetElements();
if (!maybe_obj->ToObject(&obj)) return maybe_obj;
}
from->set_length(Smi::FromInt(0));
return to;
}
// How many elements does this object/array have?
RUNTIME_FUNCTION(MaybeObject*, Runtime_EstimateNumberOfElements) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSObject, object, args[0]);
HeapObject* elements = object->elements();
if (elements->IsDictionary()) {
return Smi::FromInt(NumberDictionary::cast(elements)->NumberOfElements());
} else if (object->IsJSArray()) {
return JSArray::cast(object)->length();
} else {
return Smi::FromInt(FixedArray::cast(elements)->length());
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SwapElements) {
HandleScope handle_scope(isolate);
ASSERT_EQ(3, args.length());
CONVERT_ARG_CHECKED(JSObject, object, 0);
Handle<Object> key1 = args.at<Object>(1);
Handle<Object> key2 = args.at<Object>(2);
uint32_t index1, index2;
if (!key1->ToArrayIndex(&index1)
|| !key2->ToArrayIndex(&index2)) {
return isolate->ThrowIllegalOperation();
}
Handle<JSObject> jsobject = Handle<JSObject>::cast(object);
Handle<Object> tmp1 = GetElement(jsobject, index1);
RETURN_IF_EMPTY_HANDLE(isolate, tmp1);
Handle<Object> tmp2 = GetElement(jsobject, index2);
RETURN_IF_EMPTY_HANDLE(isolate, tmp2);
RETURN_IF_EMPTY_HANDLE(isolate,
SetElement(jsobject, index1, tmp2, kStrictMode));
RETURN_IF_EMPTY_HANDLE(isolate,
SetElement(jsobject, index2, tmp1, kStrictMode));
return isolate->heap()->undefined_value();
}
// Returns an array that tells you where in the [0, length) interval an array
// might have elements. Can either return keys (positive integers) or
// intervals (pair of a negative integer (-start-1) followed by a
// positive (length)) or undefined values.
// Intervals can span over some keys that are not in the object.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetArrayKeys) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSObject, array, 0);
CONVERT_NUMBER_CHECKED(uint32_t, length, Uint32, args[1]);
if (array->elements()->IsDictionary()) {
// Create an array and get all the keys into it, then remove all the
// keys that are not integers in the range 0 to length-1.
Handle<FixedArray> keys = GetKeysInFixedArrayFor(array, INCLUDE_PROTOS);
int keys_length = keys->length();
for (int i = 0; i < keys_length; i++) {
Object* key = keys->get(i);
uint32_t index = 0;
if (!key->ToArrayIndex(&index) || index >= length) {
// Zap invalid keys.
keys->set_undefined(i);
}
}
return *isolate->factory()->NewJSArrayWithElements(keys);
} else {
ASSERT(array->HasFastElements());
Handle<FixedArray> single_interval = isolate->factory()->NewFixedArray(2);
// -1 means start of array.
single_interval->set(0, Smi::FromInt(-1));
uint32_t actual_length =
static_cast<uint32_t>(FixedArray::cast(array->elements())->length());
uint32_t min_length = actual_length < length ? actual_length : length;
Handle<Object> length_object =
isolate->factory()->NewNumber(static_cast<double>(min_length));
single_interval->set(1, *length_object);
return *isolate->factory()->NewJSArrayWithElements(single_interval);
}
}
// DefineAccessor takes an optional final argument which is the
// property attributes (eg, DONT_ENUM, DONT_DELETE). IMPORTANT: due
// to the way accessors are implemented, it is set for both the getter
// and setter on the first call to DefineAccessor and ignored on
// subsequent calls.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineAccessor) {
RUNTIME_ASSERT(args.length() == 4 || args.length() == 5);
// Compute attributes.
PropertyAttributes attributes = NONE;
if (args.length() == 5) {
CONVERT_CHECKED(Smi, attrs, args[4]);
int value = attrs->value();
// Only attribute bits should be set.
ASSERT((value & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
attributes = static_cast<PropertyAttributes>(value);
}
CONVERT_CHECKED(JSObject, obj, args[0]);
CONVERT_CHECKED(String, name, args[1]);
CONVERT_CHECKED(Smi, flag, args[2]);
CONVERT_CHECKED(JSFunction, fun, args[3]);
return obj->DefineAccessor(name, flag->value() == 0, fun, attributes);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_LookupAccessor) {
ASSERT(args.length() == 3);
CONVERT_CHECKED(JSObject, obj, args[0]);
CONVERT_CHECKED(String, name, args[1]);
CONVERT_CHECKED(Smi, flag, args[2]);
return obj->LookupAccessor(name, flag->value() == 0);
}
#ifdef ENABLE_DEBUGGER_SUPPORT
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugBreak) {
ASSERT(args.length() == 0);
return Execution::DebugBreakHelper();
}
// Helper functions for wrapping and unwrapping stack frame ids.
static Smi* WrapFrameId(StackFrame::Id id) {
ASSERT(IsAligned(OffsetFrom(id), static_cast<intptr_t>(4)));
return Smi::FromInt(id >> 2);
}
static StackFrame::Id UnwrapFrameId(Smi* wrapped) {
return static_cast<StackFrame::Id>(wrapped->value() << 2);
}
// Adds a JavaScript function as a debug event listener.
// args[0]: debug event listener function to set or null or undefined for
// clearing the event listener function
// args[1]: object supplied during callback
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetDebugEventListener) {
ASSERT(args.length() == 2);
RUNTIME_ASSERT(args[0]->IsJSFunction() ||
args[0]->IsUndefined() ||
args[0]->IsNull());
Handle<Object> callback = args.at<Object>(0);
Handle<Object> data = args.at<Object>(1);
isolate->debugger()->SetEventListener(callback, data);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Break) {
ASSERT(args.length() == 0);
isolate->stack_guard()->DebugBreak();
return isolate->heap()->undefined_value();
}
static MaybeObject* DebugLookupResultValue(Heap* heap,
Object* receiver,
String* name,
LookupResult* result,
bool* caught_exception) {
Object* value;
switch (result->type()) {
case NORMAL:
value = result->holder()->GetNormalizedProperty(result);
if (value->IsTheHole()) {
return heap->undefined_value();
}
return value;
case FIELD:
value =
JSObject::cast(
result->holder())->FastPropertyAt(result->GetFieldIndex());
if (value->IsTheHole()) {
return heap->undefined_value();
}
return value;
case CONSTANT_FUNCTION:
return result->GetConstantFunction();
case CALLBACKS: {
Object* structure = result->GetCallbackObject();
if (structure->IsProxy() || structure->IsAccessorInfo()) {
MaybeObject* maybe_value = receiver->GetPropertyWithCallback(
receiver, structure, name, result->holder());
if (!maybe_value->ToObject(&value)) {
if (maybe_value->IsRetryAfterGC()) return maybe_value;
ASSERT(maybe_value->IsException());
maybe_value = heap->isolate()->pending_exception();
heap->isolate()->clear_pending_exception();
if (caught_exception != NULL) {
*caught_exception = true;
}
return maybe_value;
}
return value;
} else {
return heap->undefined_value();
}
}
case INTERCEPTOR:
case MAP_TRANSITION:
case EXTERNAL_ARRAY_TRANSITION:
case CONSTANT_TRANSITION:
case NULL_DESCRIPTOR:
return heap->undefined_value();
default:
UNREACHABLE();
}
UNREACHABLE();
return heap->undefined_value();
}
// Get debugger related details for an object property.
// args[0]: object holding property
// args[1]: name of the property
//
// The array returned contains the following information:
// 0: Property value
// 1: Property details
// 2: Property value is exception
// 3: Getter function if defined
// 4: Setter function if defined
// Items 2-4 are only filled if the property has either a getter or a setter
// defined through __defineGetter__ and/or __defineSetter__.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugGetPropertyDetails) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
CONVERT_ARG_CHECKED(String, name, 1);
// Make sure to set the current context to the context before the debugger was
// entered (if the debugger is entered). The reason for switching context here
// is that for some property lookups (accessors and interceptors) callbacks
// into the embedding application can occour, and the embedding application
// could have the assumption that its own global context is the current
// context and not some internal debugger context.
SaveContext save(isolate);
if (isolate->debug()->InDebugger()) {
isolate->set_context(*isolate->debug()->debugger_entry()->GetContext());
}
// Skip the global proxy as it has no properties and always delegates to the
// real global object.
if (obj->IsJSGlobalProxy()) {
obj = Handle<JSObject>(JSObject::cast(obj->GetPrototype()));
}
// Check if the name is trivially convertible to an index and get the element
// if so.
uint32_t index;
if (name->AsArrayIndex(&index)) {
Handle<FixedArray> details = isolate->factory()->NewFixedArray(2);
Object* element_or_char;
{ MaybeObject* maybe_element_or_char =
Runtime::GetElementOrCharAt(isolate, obj, index);
if (!maybe_element_or_char->ToObject(&element_or_char)) {
return maybe_element_or_char;
}
}
details->set(0, element_or_char);
details->set(1, PropertyDetails(NONE, NORMAL).AsSmi());
return *isolate->factory()->NewJSArrayWithElements(details);
}
// Find the number of objects making up this.
int length = LocalPrototypeChainLength(*obj);
// Try local lookup on each of the objects.
Handle<JSObject> jsproto = obj;
for (int i = 0; i < length; i++) {
LookupResult result;
jsproto->LocalLookup(*name, &result);
if (result.IsProperty()) {
// LookupResult is not GC safe as it holds raw object pointers.
// GC can happen later in this code so put the required fields into
// local variables using handles when required for later use.
PropertyType result_type = result.type();
Handle<Object> result_callback_obj;
if (result_type == CALLBACKS) {
result_callback_obj = Handle<Object>(result.GetCallbackObject(),
isolate);
}
Smi* property_details = result.GetPropertyDetails().AsSmi();
// DebugLookupResultValue can cause GC so details from LookupResult needs
// to be copied to handles before this.
bool caught_exception = false;
Object* raw_value;
{ MaybeObject* maybe_raw_value =
DebugLookupResultValue(isolate->heap(), *obj, *name,
&result, &caught_exception);
if (!maybe_raw_value->ToObject(&raw_value)) return maybe_raw_value;
}
Handle<Object> value(raw_value, isolate);
// If the callback object is a fixed array then it contains JavaScript
// getter and/or setter.
bool hasJavaScriptAccessors = result_type == CALLBACKS &&
result_callback_obj->IsFixedArray();
Handle<FixedArray> details =
isolate->factory()->NewFixedArray(hasJavaScriptAccessors ? 5 : 2);
details->set(0, *value);
details->set(1, property_details);
if (hasJavaScriptAccessors) {
details->set(2,
caught_exception ? isolate->heap()->true_value()
: isolate->heap()->false_value());
details->set(3, FixedArray::cast(*result_callback_obj)->get(0));
details->set(4, FixedArray::cast(*result_callback_obj)->get(1));
}
return *isolate->factory()->NewJSArrayWithElements(details);
}
if (i < length - 1) {
jsproto = Handle<JSObject>(JSObject::cast(jsproto->GetPrototype()));
}
}
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugGetProperty) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
CONVERT_ARG_CHECKED(String, name, 1);
LookupResult result;
obj->Lookup(*name, &result);
if (result.IsProperty()) {
return DebugLookupResultValue(isolate->heap(), *obj, *name, &result, NULL);
}
return isolate->heap()->undefined_value();
}
// Return the property type calculated from the property details.
// args[0]: smi with property details.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPropertyTypeFromDetails) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(Smi, details, args[0]);
PropertyType type = PropertyDetails(details).type();
return Smi::FromInt(static_cast<int>(type));
}
// Return the property attribute calculated from the property details.
// args[0]: smi with property details.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPropertyAttributesFromDetails) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(Smi, details, args[0]);
PropertyAttributes attributes = PropertyDetails(details).attributes();
return Smi::FromInt(static_cast<int>(attributes));
}
// Return the property insertion index calculated from the property details.
// args[0]: smi with property details.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPropertyIndexFromDetails) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(Smi, details, args[0]);
int index = PropertyDetails(details).index();
return Smi::FromInt(index);
}
// Return property value from named interceptor.
// args[0]: object
// args[1]: property name
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugNamedInterceptorPropertyValue) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
RUNTIME_ASSERT(obj->HasNamedInterceptor());
CONVERT_ARG_CHECKED(String, name, 1);
PropertyAttributes attributes;
return obj->GetPropertyWithInterceptor(*obj, *name, &attributes);
}
// Return element value from indexed interceptor.
// args[0]: object
// args[1]: index
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugIndexedInterceptorElementValue) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CONVERT_ARG_CHECKED(JSObject, obj, 0);
RUNTIME_ASSERT(obj->HasIndexedInterceptor());
CONVERT_NUMBER_CHECKED(uint32_t, index, Uint32, args[1]);
return obj->GetElementWithInterceptor(*obj, index);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_CheckExecutionState) {
ASSERT(args.length() >= 1);
CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
// Check that the break id is valid.
if (isolate->debug()->break_id() == 0 ||
break_id != isolate->debug()->break_id()) {
return isolate->Throw(
isolate->heap()->illegal_execution_state_symbol());
}
return isolate->heap()->true_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetFrameCount) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
// Check arguments.
Object* result;
{ MaybeObject* maybe_result = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_result->ToObject(&result)) return maybe_result;
}
// Count all frames which are relevant to debugging stack trace.
int n = 0;
StackFrame::Id id = isolate->debug()->break_frame_id();
if (id == StackFrame::NO_ID) {
// If there is no JavaScript stack frame count is 0.
return Smi::FromInt(0);
}
for (JavaScriptFrameIterator it(isolate, id); !it.done(); it.Advance()) n++;
return Smi::FromInt(n);
}
static const int kFrameDetailsFrameIdIndex = 0;
static const int kFrameDetailsReceiverIndex = 1;
static const int kFrameDetailsFunctionIndex = 2;
static const int kFrameDetailsArgumentCountIndex = 3;
static const int kFrameDetailsLocalCountIndex = 4;
static const int kFrameDetailsSourcePositionIndex = 5;
static const int kFrameDetailsConstructCallIndex = 6;
static const int kFrameDetailsAtReturnIndex = 7;
static const int kFrameDetailsDebuggerFrameIndex = 8;
static const int kFrameDetailsFirstDynamicIndex = 9;
// Return an array with frame details
// args[0]: number: break id
// args[1]: number: frame index
//
// The array returned contains the following information:
// 0: Frame id
// 1: Receiver
// 2: Function
// 3: Argument count
// 4: Local count
// 5: Source position
// 6: Constructor call
// 7: Is at return
// 8: Debugger frame
// Arguments name, value
// Locals name, value
// Return value if any
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetFrameDetails) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
// Check arguments.
Object* check;
{ MaybeObject* maybe_check = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check->ToObject(&check)) return maybe_check;
}
CONVERT_NUMBER_CHECKED(int, index, Int32, args[1]);
Heap* heap = isolate->heap();
// Find the relevant frame with the requested index.
StackFrame::Id id = isolate->debug()->break_frame_id();
if (id == StackFrame::NO_ID) {
// If there are no JavaScript stack frames return undefined.
return heap->undefined_value();
}
int count = 0;
JavaScriptFrameIterator it(isolate, id);
for (; !it.done(); it.Advance()) {
if (count == index) break;
count++;
}
if (it.done()) return heap->undefined_value();
bool is_optimized_frame =
it.frame()->LookupCode()->kind() == Code::OPTIMIZED_FUNCTION;
// Traverse the saved contexts chain to find the active context for the
// selected frame.
SaveContext* save = isolate->save_context();
while (save != NULL && !save->below(it.frame())) {
save = save->prev();
}
ASSERT(save != NULL);
// Get the frame id.
Handle<Object> frame_id(WrapFrameId(it.frame()->id()), isolate);
// Find source position.
int position =
it.frame()->LookupCode()->SourcePosition(it.frame()->pc());
// Check for constructor frame.
bool constructor = it.frame()->IsConstructor();
// Get scope info and read from it for local variable information.
Handle<JSFunction> function(JSFunction::cast(it.frame()->function()));
Handle<SerializedScopeInfo> scope_info(function->shared()->scope_info());
ScopeInfo<> info(*scope_info);
// Get the context.
Handle<Context> context(Context::cast(it.frame()->context()));
// Get the locals names and values into a temporary array.
//
// TODO(1240907): Hide compiler-introduced stack variables
// (e.g. .result)? For users of the debugger, they will probably be
// confusing.
Handle<FixedArray> locals =
isolate->factory()->NewFixedArray(info.NumberOfLocals() * 2);
// Fill in the names of the locals.
for (int i = 0; i < info.NumberOfLocals(); i++) {
locals->set(i * 2, *info.LocalName(i));
}
// Fill in the values of the locals.
for (int i = 0; i < info.NumberOfLocals(); i++) {
if (is_optimized_frame) {
// If we are inspecting an optimized frame use undefined as the
// value for all locals.
//
// TODO(1140): We should be able to get the correct values
// for locals in optimized frames.
locals->set(i * 2 + 1, isolate->heap()->undefined_value());
} else if (i < info.number_of_stack_slots()) {
// Get the value from the stack.
locals->set(i * 2 + 1, it.frame()->GetExpression(i));
} else {
// Traverse the context chain to the function context as all local
// variables stored in the context will be on the function context.
Handle<String> name = info.LocalName(i);
while (!context->is_function_context()) {
context = Handle<Context>(context->previous());
}
ASSERT(context->is_function_context());
locals->set(i * 2 + 1,
context->get(scope_info->ContextSlotIndex(*name, NULL)));
}
}
// Check whether this frame is positioned at return. If not top
// frame or if the frame is optimized it cannot be at a return.
bool at_return = false;
if (!is_optimized_frame && index == 0) {
at_return = isolate->debug()->IsBreakAtReturn(it.frame());
}
// If positioned just before return find the value to be returned and add it
// to the frame information.
Handle<Object> return_value = isolate->factory()->undefined_value();
if (at_return) {
StackFrameIterator it2(isolate);
Address internal_frame_sp = NULL;
while (!it2.done()) {
if (it2.frame()->is_internal()) {
internal_frame_sp = it2.frame()->sp();
} else {
if (it2.frame()->is_java_script()) {
if (it2.frame()->id() == it.frame()->id()) {
// The internal frame just before the JavaScript frame contains the
// value to return on top. A debug break at return will create an
// internal frame to store the return value (eax/rax/r0) before
// entering the debug break exit frame.
if (internal_frame_sp != NULL) {
return_value =
Handle<Object>(Memory::Object_at(internal_frame_sp),
isolate);
break;
}
}
}
// Indicate that the previous frame was not an internal frame.
internal_frame_sp = NULL;
}
it2.Advance();
}
}
// Now advance to the arguments adapter frame (if any). It contains all
// the provided parameters whereas the function frame always have the number
// of arguments matching the functions parameters. The rest of the
// information (except for what is collected above) is the same.
it.AdvanceToArgumentsFrame();
// Find the number of arguments to fill. At least fill the number of
// parameters for the function and fill more if more parameters are provided.
int argument_count = info.number_of_parameters();
if (argument_count < it.frame()->ComputeParametersCount()) {
argument_count = it.frame()->ComputeParametersCount();
}
// Calculate the size of the result.
int details_size = kFrameDetailsFirstDynamicIndex +
2 * (argument_count + info.NumberOfLocals()) +
(at_return ? 1 : 0);
Handle<FixedArray> details = isolate->factory()->NewFixedArray(details_size);
// Add the frame id.
details->set(kFrameDetailsFrameIdIndex, *frame_id);
// Add the function (same as in function frame).
details->set(kFrameDetailsFunctionIndex, it.frame()->function());
// Add the arguments count.
details->set(kFrameDetailsArgumentCountIndex, Smi::FromInt(argument_count));
// Add the locals count
details->set(kFrameDetailsLocalCountIndex,
Smi::FromInt(info.NumberOfLocals()));
// Add the source position.
if (position != RelocInfo::kNoPosition) {
details->set(kFrameDetailsSourcePositionIndex, Smi::FromInt(position));
} else {
details->set(kFrameDetailsSourcePositionIndex, heap->undefined_value());
}
// Add the constructor information.
details->set(kFrameDetailsConstructCallIndex, heap->ToBoolean(constructor));
// Add the at return information.
details->set(kFrameDetailsAtReturnIndex, heap->ToBoolean(at_return));
// Add information on whether this frame is invoked in the debugger context.
details->set(kFrameDetailsDebuggerFrameIndex,
heap->ToBoolean(*save->context() ==
*isolate->debug()->debug_context()));
// Fill the dynamic part.
int details_index = kFrameDetailsFirstDynamicIndex;
// Add arguments name and value.
for (int i = 0; i < argument_count; i++) {
// Name of the argument.
if (i < info.number_of_parameters()) {
details->set(details_index++, *info.parameter_name(i));
} else {
details->set(details_index++, heap->undefined_value());
}
// Parameter value. If we are inspecting an optimized frame, use
// undefined as the value.
//
// TODO(3141533): We should be able to get the actual parameter
// value for optimized frames.
if (!is_optimized_frame &&
(i < it.frame()->ComputeParametersCount())) {
details->set(details_index++, it.frame()->GetParameter(i));
} else {
details->set(details_index++, heap->undefined_value());
}
}
// Add locals name and value from the temporary copy from the function frame.
for (int i = 0; i < info.NumberOfLocals() * 2; i++) {
details->set(details_index++, locals->get(i));
}
// Add the value being returned.
if (at_return) {
details->set(details_index++, *return_value);
}
// Add the receiver (same as in function frame).
// THIS MUST BE DONE LAST SINCE WE MIGHT ADVANCE
// THE FRAME ITERATOR TO WRAP THE RECEIVER.
Handle<Object> receiver(it.frame()->receiver(), isolate);
if (!receiver->IsJSObject()) {
// If the receiver is NOT a JSObject we have hit an optimization
// where a value object is not converted into a wrapped JS objects.
// To hide this optimization from the debugger, we wrap the receiver
// by creating correct wrapper object based on the calling frame's
// global context.
it.Advance();
Handle<Context> calling_frames_global_context(
Context::cast(Context::cast(it.frame()->context())->global_context()));
receiver =
isolate->factory()->ToObject(receiver, calling_frames_global_context);
}
details->set(kFrameDetailsReceiverIndex, *receiver);
ASSERT_EQ(details_size, details_index);
return *isolate->factory()->NewJSArrayWithElements(details);
}
// Copy all the context locals into an object used to materialize a scope.
static bool CopyContextLocalsToScopeObject(
Isolate* isolate,
Handle<SerializedScopeInfo> serialized_scope_info,
ScopeInfo<>& scope_info,
Handle<Context> context,
Handle<JSObject> scope_object) {
// Fill all context locals to the context extension.
for (int i = Context::MIN_CONTEXT_SLOTS;
i < scope_info.number_of_context_slots();
i++) {
int context_index = serialized_scope_info->ContextSlotIndex(
*scope_info.context_slot_name(i), NULL);
// Don't include the arguments shadow (.arguments) context variable.
if (*scope_info.context_slot_name(i) !=
isolate->heap()->arguments_shadow_symbol()) {
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(scope_object,
scope_info.context_slot_name(i),
Handle<Object>(context->get(context_index), isolate),
NONE,
kNonStrictMode),
false);
}
}
return true;
}
// Create a plain JSObject which materializes the local scope for the specified
// frame.
static Handle<JSObject> MaterializeLocalScope(Isolate* isolate,
JavaScriptFrame* frame) {
Handle<JSFunction> function(JSFunction::cast(frame->function()));
Handle<SharedFunctionInfo> shared(function->shared());
Handle<SerializedScopeInfo> serialized_scope_info(shared->scope_info());
ScopeInfo<> scope_info(*serialized_scope_info);
// Allocate and initialize a JSObject with all the arguments, stack locals
// heap locals and extension properties of the debugged function.
Handle<JSObject> local_scope =
isolate->factory()->NewJSObject(isolate->object_function());
// First fill all parameters.
for (int i = 0; i < scope_info.number_of_parameters(); ++i) {
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(local_scope,
scope_info.parameter_name(i),
Handle<Object>(frame->GetParameter(i), isolate),
NONE,
kNonStrictMode),
Handle<JSObject>());
}
// Second fill all stack locals.
for (int i = 0; i < scope_info.number_of_stack_slots(); i++) {
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(local_scope,
scope_info.stack_slot_name(i),
Handle<Object>(frame->GetExpression(i), isolate),
NONE,
kNonStrictMode),
Handle<JSObject>());
}
// Third fill all context locals.
Handle<Context> frame_context(Context::cast(frame->context()));
Handle<Context> function_context(frame_context->fcontext());
if (!CopyContextLocalsToScopeObject(isolate,
serialized_scope_info, scope_info,
function_context, local_scope)) {
return Handle<JSObject>();
}
// Finally copy any properties from the function context extension. This will
// be variables introduced by eval.
if (function_context->closure() == *function) {
if (function_context->has_extension() &&
!function_context->IsGlobalContext()) {
Handle<JSObject> ext(JSObject::cast(function_context->extension()));
Handle<FixedArray> keys = GetKeysInFixedArrayFor(ext, INCLUDE_PROTOS);
for (int i = 0; i < keys->length(); i++) {
// Names of variables introduced by eval are strings.
ASSERT(keys->get(i)->IsString());
Handle<String> key(String::cast(keys->get(i)));
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(local_scope,
key,
GetProperty(ext, key),
NONE,
kNonStrictMode),
Handle<JSObject>());
}
}
}
return local_scope;
}
// Create a plain JSObject which materializes the closure content for the
// context.
static Handle<JSObject> MaterializeClosure(Isolate* isolate,
Handle<Context> context) {
ASSERT(context->is_function_context());
Handle<SharedFunctionInfo> shared(context->closure()->shared());
Handle<SerializedScopeInfo> serialized_scope_info(shared->scope_info());
ScopeInfo<> scope_info(*serialized_scope_info);
// Allocate and initialize a JSObject with all the content of theis function
// closure.
Handle<JSObject> closure_scope =
isolate->factory()->NewJSObject(isolate->object_function());
// Check whether the arguments shadow object exists.
int arguments_shadow_index =
shared->scope_info()->ContextSlotIndex(
isolate->heap()->arguments_shadow_symbol(), NULL);
if (arguments_shadow_index >= 0) {
// In this case all the arguments are available in the arguments shadow
// object.
Handle<JSObject> arguments_shadow(
JSObject::cast(context->get(arguments_shadow_index)));
for (int i = 0; i < scope_info.number_of_parameters(); ++i) {
// We don't expect exception-throwing getters on the arguments shadow.
Object* element = arguments_shadow->GetElement(i)->ToObjectUnchecked();
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(closure_scope,
scope_info.parameter_name(i),
Handle<Object>(element, isolate),
NONE,
kNonStrictMode),
Handle<JSObject>());
}
}
// Fill all context locals to the context extension.
if (!CopyContextLocalsToScopeObject(isolate,
serialized_scope_info, scope_info,
context, closure_scope)) {
return Handle<JSObject>();
}
// Finally copy any properties from the function context extension. This will
// be variables introduced by eval.
if (context->has_extension()) {
Handle<JSObject> ext(JSObject::cast(context->extension()));
Handle<FixedArray> keys = GetKeysInFixedArrayFor(ext, INCLUDE_PROTOS);
for (int i = 0; i < keys->length(); i++) {
// Names of variables introduced by eval are strings.
ASSERT(keys->get(i)->IsString());
Handle<String> key(String::cast(keys->get(i)));
RETURN_IF_EMPTY_HANDLE_VALUE(
isolate,
SetProperty(closure_scope,
key,
GetProperty(ext, key),
NONE,
kNonStrictMode),
Handle<JSObject>());
}
}
return closure_scope;
}
// Iterate over the actual scopes visible from a stack frame. All scopes are
// backed by an actual context except the local scope, which is inserted
// "artifically" in the context chain.
class ScopeIterator {
public:
enum ScopeType {
ScopeTypeGlobal = 0,
ScopeTypeLocal,
ScopeTypeWith,
ScopeTypeClosure,
// Every catch block contains an implicit with block (its parameter is
// a JSContextExtensionObject) that extends current scope with a variable
// holding exception object. Such with blocks are treated as scopes of their
// own type.
ScopeTypeCatch
};
ScopeIterator(Isolate* isolate, JavaScriptFrame* frame)
: isolate_(isolate),
frame_(frame),
function_(JSFunction::cast(frame->function())),
context_(Context::cast(frame->context())),
local_done_(false),
at_local_(false) {
// Check whether the first scope is actually a local scope.
if (context_->IsGlobalContext()) {
// If there is a stack slot for .result then this local scope has been
// created for evaluating top level code and it is not a real local scope.
// Checking for the existence of .result seems fragile, but the scope info
// saved with the code object does not otherwise have that information.
int index = function_->shared()->scope_info()->
StackSlotIndex(isolate_->heap()->result_symbol());
at_local_ = index < 0;
} else if (context_->is_function_context()) {
at_local_ = true;
} else if (context_->closure() != *function_) {
// The context_ is a with block from the outer function.
ASSERT(context_->has_extension());
at_local_ = true;
}
}
// More scopes?
bool Done() { return context_.is_null(); }
// Move to the next scope.
void Next() {
// If at a local scope mark the local scope as passed.
if (at_local_) {
at_local_ = false;
local_done_ = true;
// If the current context is not associated with the local scope the
// current context is the next real scope, so don't move to the next
// context in this case.
if (context_->closure() != *function_) {
return;
}
}
// The global scope is always the last in the chain.
if (context_->IsGlobalContext()) {
context_ = Handle<Context>();
return;
}
// Move to the next context.
if (context_->is_function_context()) {
context_ = Handle<Context>(Context::cast(context_->closure()->context()));
} else {
context_ = Handle<Context>(context_->previous());
}
// If passing the local scope indicate that the current scope is now the
// local scope.
if (!local_done_ &&
(context_->IsGlobalContext() || (context_->is_function_context()))) {
at_local_ = true;
}
}
// Return the type of the current scope.
int Type() {
if (at_local_) {
return ScopeTypeLocal;
}
if (context_->IsGlobalContext()) {
ASSERT(context_->global()->IsGlobalObject());
return ScopeTypeGlobal;
}
if (context_->is_function_context()) {
return ScopeTypeClosure;
}
ASSERT(context_->has_extension());
// Current scope is either an explicit with statement or a with statement
// implicitely generated for a catch block.
// If the extension object here is a JSContextExtensionObject then
// current with statement is one frome a catch block otherwise it's a
// regular with statement.
if (context_->extension()->IsJSContextExtensionObject()) {
return ScopeTypeCatch;
}
return ScopeTypeWith;
}
// Return the JavaScript object with the content of the current scope.
Handle<JSObject> ScopeObject() {
switch (Type()) {
case ScopeIterator::ScopeTypeGlobal:
return Handle<JSObject>(CurrentContext()->global());
break;
case ScopeIterator::ScopeTypeLocal:
// Materialize the content of the local scope into a JSObject.
return MaterializeLocalScope(isolate_, frame_);
break;
case ScopeIterator::ScopeTypeWith:
case ScopeIterator::ScopeTypeCatch:
// Return the with object.
return Handle<JSObject>(CurrentContext()->extension());
break;
case ScopeIterator::ScopeTypeClosure:
// Materialize the content of the closure scope into a JSObject.
return MaterializeClosure(isolate_, CurrentContext());
break;
}
UNREACHABLE();
return Handle<JSObject>();
}
// Return the context for this scope. For the local context there might not
// be an actual context.
Handle<Context> CurrentContext() {
if (at_local_ && context_->closure() != *function_) {
return Handle<Context>();
}
return context_;
}
#ifdef DEBUG
// Debug print of the content of the current scope.
void DebugPrint() {
switch (Type()) {
case ScopeIterator::ScopeTypeGlobal:
PrintF("Global:\n");
CurrentContext()->Print();
break;
case ScopeIterator::ScopeTypeLocal: {
PrintF("Local:\n");
ScopeInfo<> scope_info(function_->shared()->scope_info());
scope_info.Print();
if (!CurrentContext().is_null()) {
CurrentContext()->Print();
if (CurrentContext()->has_extension()) {
Handle<JSObject> extension =
Handle<JSObject>(CurrentContext()->extension());
if (extension->IsJSContextExtensionObject()) {
extension->Print();
}
}
}
break;
}
case ScopeIterator::ScopeTypeWith: {
PrintF("With:\n");
Handle<JSObject> extension =
Handle<JSObject>(CurrentContext()->extension());
extension->Print();
break;
}
case ScopeIterator::ScopeTypeCatch: {
PrintF("Catch:\n");
Handle<JSObject> extension =
Handle<JSObject>(CurrentContext()->extension());
extension->Print();
break;
}
case ScopeIterator::ScopeTypeClosure: {
PrintF("Closure:\n");
CurrentContext()->Print();
if (CurrentContext()->has_extension()) {
Handle<JSObject> extension =
Handle<JSObject>(CurrentContext()->extension());
if (extension->IsJSContextExtensionObject()) {
extension->Print();
}
}
break;
}
default:
UNREACHABLE();
}
PrintF("\n");
}
#endif
private:
Isolate* isolate_;
JavaScriptFrame* frame_;
Handle<JSFunction> function_;
Handle<Context> context_;
bool local_done_;
bool at_local_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ScopeIterator);
};
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetScopeCount) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
// Check arguments.
Object* check;
{ MaybeObject* maybe_check = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check->ToObject(&check)) return maybe_check;
}
CONVERT_CHECKED(Smi, wrapped_id, args[1]);
// Get the frame where the debugging is performed.
StackFrame::Id id = UnwrapFrameId(wrapped_id);
JavaScriptFrameIterator it(isolate, id);
JavaScriptFrame* frame = it.frame();
// Count the visible scopes.
int n = 0;
for (ScopeIterator it(isolate, frame); !it.Done(); it.Next()) {
n++;
}
return Smi::FromInt(n);
}
static const int kScopeDetailsTypeIndex = 0;
static const int kScopeDetailsObjectIndex = 1;
static const int kScopeDetailsSize = 2;
// Return an array with scope details
// args[0]: number: break id
// args[1]: number: frame index
// args[2]: number: scope index
//
// The array returned contains the following information:
// 0: Scope type
// 1: Scope object
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetScopeDetails) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
// Check arguments.
Object* check;
{ MaybeObject* maybe_check = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check->ToObject(&check)) return maybe_check;
}
CONVERT_CHECKED(Smi, wrapped_id, args[1]);
CONVERT_NUMBER_CHECKED(int, index, Int32, args[2]);
// Get the frame where the debugging is performed.
StackFrame::Id id = UnwrapFrameId(wrapped_id);
JavaScriptFrameIterator frame_it(isolate, id);
JavaScriptFrame* frame = frame_it.frame();
// Find the requested scope.
int n = 0;
ScopeIterator it(isolate, frame);
for (; !it.Done() && n < index; it.Next()) {
n++;
}
if (it.Done()) {
return isolate->heap()->undefined_value();
}
// Calculate the size of the result.
int details_size = kScopeDetailsSize;
Handle<FixedArray> details = isolate->factory()->NewFixedArray(details_size);
// Fill in scope details.
details->set(kScopeDetailsTypeIndex, Smi::FromInt(it.Type()));
Handle<JSObject> scope_object = it.ScopeObject();
RETURN_IF_EMPTY_HANDLE(isolate, scope_object);
details->set(kScopeDetailsObjectIndex, *scope_object);
return *isolate->factory()->NewJSArrayWithElements(details);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugPrintScopes) {
HandleScope scope(isolate);
ASSERT(args.length() == 0);
#ifdef DEBUG
// Print the scopes for the top frame.
StackFrameLocator locator;
JavaScriptFrame* frame = locator.FindJavaScriptFrame(0);
for (ScopeIterator it(isolate, frame); !it.Done(); it.Next()) {
it.DebugPrint();
}
#endif
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetThreadCount) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
// Check arguments.
Object* result;
{ MaybeObject* maybe_result = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_result->ToObject(&result)) return maybe_result;
}
// Count all archived V8 threads.
int n = 0;
for (ThreadState* thread =
isolate->thread_manager()->FirstThreadStateInUse();
thread != NULL;
thread = thread->Next()) {
n++;
}
// Total number of threads is current thread and archived threads.
return Smi::FromInt(n + 1);
}
static const int kThreadDetailsCurrentThreadIndex = 0;
static const int kThreadDetailsThreadIdIndex = 1;
static const int kThreadDetailsSize = 2;
// Return an array with thread details
// args[0]: number: break id
// args[1]: number: thread index
//
// The array returned contains the following information:
// 0: Is current thread?
// 1: Thread id
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetThreadDetails) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
// Check arguments.
Object* check;
{ MaybeObject* maybe_check = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check->ToObject(&check)) return maybe_check;
}
CONVERT_NUMBER_CHECKED(int, index, Int32, args[1]);
// Allocate array for result.
Handle<FixedArray> details =
isolate->factory()->NewFixedArray(kThreadDetailsSize);
// Thread index 0 is current thread.
if (index == 0) {
// Fill the details.
details->set(kThreadDetailsCurrentThreadIndex,
isolate->heap()->true_value());
details->set(kThreadDetailsThreadIdIndex,
Smi::FromInt(ThreadId::Current().ToInteger()));
} else {
// Find the thread with the requested index.
int n = 1;
ThreadState* thread =
isolate->thread_manager()->FirstThreadStateInUse();
while (index != n && thread != NULL) {
thread = thread->Next();
n++;
}
if (thread == NULL) {
return isolate->heap()->undefined_value();
}
// Fill the details.
details->set(kThreadDetailsCurrentThreadIndex,
isolate->heap()->false_value());
details->set(kThreadDetailsThreadIdIndex,
Smi::FromInt(thread->id().ToInteger()));
}
// Convert to JS array and return.
return *isolate->factory()->NewJSArrayWithElements(details);
}
// Sets the disable break state
// args[0]: disable break state
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetDisableBreak) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_BOOLEAN_CHECKED(disable_break, args[0]);
isolate->debug()->set_disable_break(disable_break);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetBreakLocations) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(JSFunction, fun, 0);
Handle<SharedFunctionInfo> shared(fun->shared());
// Find the number of break points
Handle<Object> break_locations = Debug::GetSourceBreakLocations(shared);
if (break_locations->IsUndefined()) return isolate->heap()->undefined_value();
// Return array as JS array
return *isolate->factory()->NewJSArrayWithElements(
Handle<FixedArray>::cast(break_locations));
}
// Set a break point in a function
// args[0]: function
// args[1]: number: break source position (within the function source)
// args[2]: number: break point object
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetFunctionBreakPoint) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(JSFunction, fun, 0);
Handle<SharedFunctionInfo> shared(fun->shared());
CONVERT_NUMBER_CHECKED(int32_t, source_position, Int32, args[1]);
RUNTIME_ASSERT(source_position >= 0);
Handle<Object> break_point_object_arg = args.at<Object>(2);
// Set break point.
isolate->debug()->SetBreakPoint(shared, break_point_object_arg,
&source_position);
return Smi::FromInt(source_position);
}
Object* Runtime::FindSharedFunctionInfoInScript(Isolate* isolate,
Handle<Script> script,
int position) {
// Iterate the heap looking for SharedFunctionInfo generated from the
// script. The inner most SharedFunctionInfo containing the source position
// for the requested break point is found.
// NOTE: This might require several heap iterations. If the SharedFunctionInfo
// which is found is not compiled it is compiled and the heap is iterated
// again as the compilation might create inner functions from the newly
// compiled function and the actual requested break point might be in one of
// these functions.
bool done = false;
// The current candidate for the source position:
int target_start_position = RelocInfo::kNoPosition;
Handle<SharedFunctionInfo> target;
while (!done) {
HeapIterator iterator;
for (HeapObject* obj = iterator.next();
obj != NULL; obj = iterator.next()) {
if (obj->IsSharedFunctionInfo()) {
Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(obj));
if (shared->script() == *script) {
// If the SharedFunctionInfo found has the requested script data and
// contains the source position it is a candidate.
int start_position = shared->function_token_position();
if (start_position == RelocInfo::kNoPosition) {
start_position = shared->start_position();
}
if (start_position <= position &&
position <= shared->end_position()) {
// If there is no candidate or this function is within the current
// candidate this is the new candidate.
if (target.is_null()) {
target_start_position = start_position;
target = shared;
} else {
if (target_start_position == start_position &&
shared->end_position() == target->end_position()) {
// If a top-level function contain only one function
// declartion the source for the top-level and the function is
// the same. In that case prefer the non top-level function.
if (!shared->is_toplevel()) {
target_start_position = start_position;
target = shared;
}
} else if (target_start_position <= start_position &&
shared->end_position() <= target->end_position()) {
// This containment check includes equality as a function inside
// a top-level function can share either start or end position
// with the top-level function.
target_start_position = start_position;
target = shared;
}
}
}
}
}
}
if (target.is_null()) {
return isolate->heap()->undefined_value();
}
// If the candidate found is compiled we are done. NOTE: when lazy
// compilation of inner functions is introduced some additional checking
// needs to be done here to compile inner functions.
done = target->is_compiled();
if (!done) {
// If the candidate is not compiled compile it to reveal any inner
// functions which might contain the requested source position.
CompileLazyShared(target, KEEP_EXCEPTION);
}
}
return *target;
}
// Changes the state of a break point in a script and returns source position
// where break point was set. NOTE: Regarding performance see the NOTE for
// GetScriptFromScriptData.
// args[0]: script to set break point in
// args[1]: number: break source position (within the script source)
// args[2]: number: break point object
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetScriptBreakPoint) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(JSValue, wrapper, 0);
CONVERT_NUMBER_CHECKED(int32_t, source_position, Int32, args[1]);
RUNTIME_ASSERT(source_position >= 0);
Handle<Object> break_point_object_arg = args.at<Object>(2);
// Get the script from the script wrapper.
RUNTIME_ASSERT(wrapper->value()->IsScript());
Handle<Script> script(Script::cast(wrapper->value()));
Object* result = Runtime::FindSharedFunctionInfoInScript(
isolate, script, source_position);
if (!result->IsUndefined()) {
Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(result));
// Find position within function. The script position might be before the
// source position of the first function.
int position;
if (shared->start_position() > source_position) {
position = 0;
} else {
position = source_position - shared->start_position();
}
isolate->debug()->SetBreakPoint(shared, break_point_object_arg, &position);
position += shared->start_position();
return Smi::FromInt(position);
}
return isolate->heap()->undefined_value();
}
// Clear a break point
// args[0]: number: break point object
RUNTIME_FUNCTION(MaybeObject*, Runtime_ClearBreakPoint) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
Handle<Object> break_point_object_arg = args.at<Object>(0);
// Clear break point.
isolate->debug()->ClearBreakPoint(break_point_object_arg);
return isolate->heap()->undefined_value();
}
// Change the state of break on exceptions.
// args[0]: Enum value indicating whether to affect caught/uncaught exceptions.
// args[1]: Boolean indicating on/off.
RUNTIME_FUNCTION(MaybeObject*, Runtime_ChangeBreakOnException) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
RUNTIME_ASSERT(args[0]->IsNumber());
CONVERT_BOOLEAN_CHECKED(enable, args[1]);
// If the number doesn't match an enum value, the ChangeBreakOnException
// function will default to affecting caught exceptions.
ExceptionBreakType type =
static_cast<ExceptionBreakType>(NumberToUint32(args[0]));
// Update break point state.
isolate->debug()->ChangeBreakOnException(type, enable);
return isolate->heap()->undefined_value();
}
// Returns the state of break on exceptions
// args[0]: boolean indicating uncaught exceptions
RUNTIME_FUNCTION(MaybeObject*, Runtime_IsBreakOnException) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
RUNTIME_ASSERT(args[0]->IsNumber());
ExceptionBreakType type =
static_cast<ExceptionBreakType>(NumberToUint32(args[0]));
bool result = isolate->debug()->IsBreakOnException(type);
return Smi::FromInt(result);
}
// Prepare for stepping
// args[0]: break id for checking execution state
// args[1]: step action from the enumeration StepAction
// args[2]: number of times to perform the step, for step out it is the number
// of frames to step down.
RUNTIME_FUNCTION(MaybeObject*, Runtime_PrepareStep) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
// Check arguments.
Object* check;
{ MaybeObject* maybe_check = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check->ToObject(&check)) return maybe_check;
}
if (!args[1]->IsNumber() || !args[2]->IsNumber()) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
// Get the step action and check validity.
StepAction step_action = static_cast<StepAction>(NumberToInt32(args[1]));
if (step_action != StepIn &&
step_action != StepNext &&
step_action != StepOut &&
step_action != StepInMin &&
step_action != StepMin) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
// Get the number of steps.
int step_count = NumberToInt32(args[2]);
if (step_count < 1) {
return isolate->Throw(isolate->heap()->illegal_argument_symbol());
}
// Clear all current stepping setup.
isolate->debug()->ClearStepping();
// Prepare step.
isolate->debug()->PrepareStep(static_cast<StepAction>(step_action),
step_count);
return isolate->heap()->undefined_value();
}
// Clear all stepping set by PrepareStep.
RUNTIME_FUNCTION(MaybeObject*, Runtime_ClearStepping) {
HandleScope scope(isolate);
ASSERT(args.length() == 0);
isolate->debug()->ClearStepping();
return isolate->heap()->undefined_value();
}
// Creates a copy of the with context chain. The copy of the context chain is
// is linked to the function context supplied.
static Handle<Context> CopyWithContextChain(Handle<Context> context_chain,
Handle<Context> function_context) {
// At the bottom of the chain. Return the function context to link to.
if (context_chain->is_function_context()) {
return function_context;
}
// Recursively copy the with contexts.
Handle<Context> previous(context_chain->previous());
Handle<JSObject> extension(JSObject::cast(context_chain->extension()));
Handle<Context> context = CopyWithContextChain(function_context, previous);
return context->GetIsolate()->factory()->NewWithContext(
context, extension, context_chain->IsCatchContext());
}
// Helper function to find or create the arguments object for
// Runtime_DebugEvaluate.
static Handle<Object> GetArgumentsObject(Isolate* isolate,
JavaScriptFrame* frame,
Handle<JSFunction> function,
Handle<SerializedScopeInfo> scope_info,
const ScopeInfo<>* sinfo,
Handle<Context> function_context) {
// Try to find the value of 'arguments' to pass as parameter. If it is not
// found (that is the debugged function does not reference 'arguments' and
// does not support eval) then create an 'arguments' object.
int index;
if (sinfo->number_of_stack_slots() > 0) {
index = scope_info->StackSlotIndex(isolate->heap()->arguments_symbol());
if (index != -1) {
return Handle<Object>(frame->GetExpression(index), isolate);
}
}
if (sinfo->number_of_context_slots() > Context::MIN_CONTEXT_SLOTS) {
index = scope_info->ContextSlotIndex(isolate->heap()->arguments_symbol(),
NULL);
if (index != -1) {
return Handle<Object>(function_context->get(index), isolate);
}
}
const int length = frame->ComputeParametersCount();
Handle<JSObject> arguments =
isolate->factory()->NewArgumentsObject(function, length);
Handle<FixedArray> array = isolate->factory()->NewFixedArray(length);
AssertNoAllocation no_gc;
WriteBarrierMode mode = array->GetWriteBarrierMode(no_gc);
for (int i = 0; i < length; i++) {
array->set(i, frame->GetParameter(i), mode);
}
arguments->set_elements(*array);
return arguments;
}
static const char kSourceStr[] =
"(function(arguments,__source__){return eval(__source__);})";
// Evaluate a piece of JavaScript in the context of a stack frame for
// debugging. This is accomplished by creating a new context which in its
// extension part has all the parameters and locals of the function on the
// stack frame. A function which calls eval with the code to evaluate is then
// compiled in this context and called in this context. As this context
// replaces the context of the function on the stack frame a new (empty)
// function is created as well to be used as the closure for the context.
// This function and the context acts as replacements for the function on the
// stack frame presenting the same view of the values of parameters and
// local variables as if the piece of JavaScript was evaluated at the point
// where the function on the stack frame is currently stopped.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
HandleScope scope(isolate);
// Check the execution state and decode arguments frame and source to be
// evaluated.
ASSERT(args.length() == 5);
Object* check_result;
{ MaybeObject* maybe_check_result = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check_result->ToObject(&check_result)) {
return maybe_check_result;
}
}
CONVERT_CHECKED(Smi, wrapped_id, args[1]);
CONVERT_ARG_CHECKED(String, source, 2);
CONVERT_BOOLEAN_CHECKED(disable_break, args[3]);
Handle<Object> additional_context(args[4]);
// Handle the processing of break.
DisableBreak disable_break_save(disable_break);
// Get the frame where the debugging is performed.
StackFrame::Id id = UnwrapFrameId(wrapped_id);
JavaScriptFrameIterator it(isolate, id);
JavaScriptFrame* frame = it.frame();
Handle<JSFunction> function(JSFunction::cast(frame->function()));
Handle<SerializedScopeInfo> scope_info(function->shared()->scope_info());
ScopeInfo<> sinfo(*scope_info);
// Traverse the saved contexts chain to find the active context for the
// selected frame.
SaveContext* save = isolate->save_context();
while (save != NULL && !save->below(frame)) {
save = save->prev();
}
ASSERT(save != NULL);
SaveContext savex(isolate);
isolate->set_context(*(save->context()));
// Create the (empty) function replacing the function on the stack frame for
// the purpose of evaluating in the context created below. It is important
// that this function does not describe any parameters and local variables
// in the context. If it does then this will cause problems with the lookup
// in Context::Lookup, where context slots for parameters and local variables
// are looked at before the extension object.
Handle<JSFunction> go_between =
isolate->factory()->NewFunction(isolate->factory()->empty_string(),
isolate->factory()->undefined_value());
go_between->set_context(function->context());
#ifdef DEBUG
ScopeInfo<> go_between_sinfo(go_between->shared()->scope_info());
ASSERT(go_between_sinfo.number_of_parameters() == 0);
ASSERT(go_between_sinfo.number_of_context_slots() == 0);
#endif
// Materialize the content of the local scope into a JSObject.
Handle<JSObject> local_scope = MaterializeLocalScope(isolate, frame);
RETURN_IF_EMPTY_HANDLE(isolate, local_scope);
// Allocate a new context for the debug evaluation and set the extension
// object build.
Handle<Context> context =
isolate->factory()->NewFunctionContext(Context::MIN_CONTEXT_SLOTS,
go_between);
context->set_extension(*local_scope);
// Copy any with contexts present and chain them in front of this context.
Handle<Context> frame_context(Context::cast(frame->context()));
Handle<Context> function_context(frame_context->fcontext());
context = CopyWithContextChain(frame_context, context);
if (additional_context->IsJSObject()) {
context = isolate->factory()->NewWithContext(context,
Handle<JSObject>::cast(additional_context), false);
}
// Wrap the evaluation statement in a new function compiled in the newly
// created context. The function has one parameter which has to be called
// 'arguments'. This it to have access to what would have been 'arguments' in
// the function being debugged.
// function(arguments,__source__) {return eval(__source__);}
Handle<String> function_source =
isolate->factory()->NewStringFromAscii(
Vector<const char>(kSourceStr, sizeof(kSourceStr) - 1));
// Currently, the eval code will be executed in non-strict mode,
// even in the strict code context.
Handle<SharedFunctionInfo> shared =
Compiler::CompileEval(function_source,
context,
context->IsGlobalContext(),
kNonStrictMode);
if (shared.is_null()) return Failure::Exception();
Handle<JSFunction> compiled_function =
isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context);
// Invoke the result of the compilation to get the evaluation function.
bool has_pending_exception;
Handle<Object> receiver(frame->receiver(), isolate);
Handle<Object> evaluation_function =
Execution::Call(compiled_function, receiver, 0, NULL,
&has_pending_exception);
if (has_pending_exception) return Failure::Exception();
Handle<Object> arguments = GetArgumentsObject(isolate, frame,
function, scope_info,
&sinfo, function_context);
// Invoke the evaluation function and return the result.
const int argc = 2;
Object** argv[argc] = { arguments.location(),
Handle<Object>::cast(source).location() };
Handle<Object> result =
Execution::Call(Handle<JSFunction>::cast(evaluation_function), receiver,
argc, argv, &has_pending_exception);
if (has_pending_exception) return Failure::Exception();
// Skip the global proxy as it has no properties and always delegates to the
// real global object.
if (result->IsJSGlobalProxy()) {
result = Handle<JSObject>(JSObject::cast(result->GetPrototype()));
}
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluateGlobal) {
HandleScope scope(isolate);
// Check the execution state and decode arguments frame and source to be
// evaluated.
ASSERT(args.length() == 4);
Object* check_result;
{ MaybeObject* maybe_check_result = Runtime_CheckExecutionState(
RUNTIME_ARGUMENTS(isolate, args));
if (!maybe_check_result->ToObject(&check_result)) {
return maybe_check_result;
}
}
CONVERT_ARG_CHECKED(String, source, 1);
CONVERT_BOOLEAN_CHECKED(disable_break, args[2]);
Handle<Object> additional_context(args[3]);
// Handle the processing of break.
DisableBreak disable_break_save(disable_break);
// Enter the top context from before the debugger was invoked.
SaveContext save(isolate);
SaveContext* top = &save;
while (top != NULL && *top->context() == *isolate->debug()->debug_context()) {
top = top->prev();
}
if (top != NULL) {
isolate->set_context(*top->context());
}
// Get the global context now set to the top context from before the
// debugger was invoked.
Handle<Context> context = isolate->global_context();
bool is_global = true;
if (additional_context->IsJSObject()) {
// Create a function context first, than put 'with' context on top of it.
Handle<JSFunction> go_between = isolate->factory()->NewFunction(
isolate->factory()->empty_string(),
isolate->factory()->undefined_value());
go_between->set_context(*context);
context =
isolate->factory()->NewFunctionContext(
Context::MIN_CONTEXT_SLOTS, go_between);
context->set_extension(JSObject::cast(*additional_context));
is_global = false;
}
// Compile the source to be evaluated.
// Currently, the eval code will be executed in non-strict mode,
// even in the strict code context.
Handle<SharedFunctionInfo> shared =
Compiler::CompileEval(source, context, is_global, kNonStrictMode);
if (shared.is_null()) return Failure::Exception();
Handle<JSFunction> compiled_function =
Handle<JSFunction>(
isolate->factory()->NewFunctionFromSharedFunctionInfo(shared,
context));
// Invoke the result of the compilation to get the evaluation function.
bool has_pending_exception;
Handle<Object> receiver = isolate->global();
Handle<Object> result =
Execution::Call(compiled_function, receiver, 0, NULL,
&has_pending_exception);
if (has_pending_exception) return Failure::Exception();
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugGetLoadedScripts) {
HandleScope scope(isolate);
ASSERT(args.length() == 0);
// Fill the script objects.
Handle<FixedArray> instances = isolate->debug()->GetLoadedScripts();
// Convert the script objects to proper JS objects.
for (int i = 0; i < instances->length(); i++) {
Handle<Script> script = Handle<Script>(Script::cast(instances->get(i)));
// Get the script wrapper in a local handle before calling GetScriptWrapper,
// because using
// instances->set(i, *GetScriptWrapper(script))
// is unsafe as GetScriptWrapper might call GC and the C++ compiler might
// already have deferenced the instances handle.
Handle<JSValue> wrapper = GetScriptWrapper(script);
instances->set(i, *wrapper);
}
// Return result as a JS array.
Handle<JSObject> result =
isolate->factory()->NewJSObject(isolate->array_function());
Handle<JSArray>::cast(result)->SetContent(*instances);
return *result;
}
// Helper function used by Runtime_DebugReferencedBy below.
static int DebugReferencedBy(JSObject* target,
Object* instance_filter, int max_references,
FixedArray* instances, int instances_size,
JSFunction* arguments_function) {
NoHandleAllocation ha;
AssertNoAllocation no_alloc;
// Iterate the heap.
int count = 0;
JSObject* last = NULL;
HeapIterator iterator;
HeapObject* heap_obj = NULL;
while (((heap_obj = iterator.next()) != NULL) &&
(max_references == 0 || count < max_references)) {
// Only look at all JSObjects.
if (heap_obj->IsJSObject()) {
// Skip context extension objects and argument arrays as these are
// checked in the context of functions using them.
JSObject* obj = JSObject::cast(heap_obj);
if (obj->IsJSContextExtensionObject() ||
obj->map()->constructor() == arguments_function) {
continue;
}
// Check if the JS object has a reference to the object looked for.
if (obj->ReferencesObject(target)) {
// Check instance filter if supplied. This is normally used to avoid
// references from mirror objects (see Runtime_IsInPrototypeChain).
if (!instance_filter->IsUndefined()) {
Object* V = obj;
while (true) {
Object* prototype = V->GetPrototype();
if (prototype->IsNull()) {
break;
}
if (instance_filter == prototype) {
obj = NULL; // Don't add this object.
break;
}
V = prototype;
}
}
if (obj != NULL) {
// Valid reference found add to instance array if supplied an update
// count.
if (instances != NULL && count < instances_size) {
instances->set(count, obj);
}
last = obj;
count++;
}
}
}
}
// Check for circular reference only. This can happen when the object is only
// referenced from mirrors and has a circular reference in which case the
// object is not really alive and would have been garbage collected if not
// referenced from the mirror.
if (count == 1 && last == target) {
count = 0;
}
// Return the number of referencing objects found.
return count;
}
// Scan the heap for objects with direct references to an object
// args[0]: the object to find references to
// args[1]: constructor function for instances to exclude (Mirror)
// args[2]: the the maximum number of objects to return
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugReferencedBy) {
ASSERT(args.length() == 3);
// First perform a full GC in order to avoid references from dead objects.
isolate->heap()->CollectAllGarbage(false);
// Check parameters.
CONVERT_CHECKED(JSObject, target, args[0]);
Object* instance_filter = args[1];
RUNTIME_ASSERT(instance_filter->IsUndefined() ||
instance_filter->IsJSObject());
CONVERT_NUMBER_CHECKED(int32_t, max_references, Int32, args[2]);
RUNTIME_ASSERT(max_references >= 0);
// Get the constructor function for context extension and arguments array.
JSObject* arguments_boilerplate =
isolate->context()->global_context()->arguments_boilerplate();
JSFunction* arguments_function =
JSFunction::cast(arguments_boilerplate->map()->constructor());
// Get the number of referencing objects.
int count;
count = DebugReferencedBy(target, instance_filter, max_references,
NULL, 0, arguments_function);
// Allocate an array to hold the result.
Object* object;
{ MaybeObject* maybe_object = isolate->heap()->AllocateFixedArray(count);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
FixedArray* instances = FixedArray::cast(object);
// Fill the referencing objects.
count = DebugReferencedBy(target, instance_filter, max_references,
instances, count, arguments_function);
// Return result as JS array.
Object* result;
{ MaybeObject* maybe_result = isolate->heap()->AllocateJSObject(
isolate->context()->global_context()->array_function());
if (!maybe_result->ToObject(&result)) return maybe_result;
}
JSArray::cast(result)->SetContent(instances);
return result;
}
// Helper function used by Runtime_DebugConstructedBy below.
static int DebugConstructedBy(JSFunction* constructor, int max_references,
FixedArray* instances, int instances_size) {
AssertNoAllocation no_alloc;
// Iterate the heap.
int count = 0;
HeapIterator iterator;
HeapObject* heap_obj = NULL;
while (((heap_obj = iterator.next()) != NULL) &&
(max_references == 0 || count < max_references)) {
// Only look at all JSObjects.
if (heap_obj->IsJSObject()) {
JSObject* obj = JSObject::cast(heap_obj);
if (obj->map()->constructor() == constructor) {
// Valid reference found add to instance array if supplied an update
// count.
if (instances != NULL && count < instances_size) {
instances->set(count, obj);
}
count++;
}
}
}
// Return the number of referencing objects found.
return count;
}
// Scan the heap for objects constructed by a specific function.
// args[0]: the constructor to find instances of
// args[1]: the the maximum number of objects to return
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugConstructedBy) {
ASSERT(args.length() == 2);
// First perform a full GC in order to avoid dead objects.
isolate->heap()->CollectAllGarbage(false);
// Check parameters.
CONVERT_CHECKED(JSFunction, constructor, args[0]);
CONVERT_NUMBER_CHECKED(int32_t, max_references, Int32, args[1]);
RUNTIME_ASSERT(max_references >= 0);
// Get the number of referencing objects.
int count;
count = DebugConstructedBy(constructor, max_references, NULL, 0);
// Allocate an array to hold the result.
Object* object;
{ MaybeObject* maybe_object = isolate->heap()->AllocateFixedArray(count);
if (!maybe_object->ToObject(&object)) return maybe_object;
}
FixedArray* instances = FixedArray::cast(object);
// Fill the referencing objects.
count = DebugConstructedBy(constructor, max_references, instances, count);
// Return result as JS array.
Object* result;
{ MaybeObject* maybe_result = isolate->heap()->AllocateJSObject(
isolate->context()->global_context()->array_function());
if (!maybe_result->ToObject(&result)) return maybe_result;
}
JSArray::cast(result)->SetContent(instances);
return result;
}
// Find the effective prototype object as returned by __proto__.
// args[0]: the object to find the prototype for.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugGetPrototype) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSObject, obj, args[0]);
// Use the __proto__ accessor.
return Accessors::ObjectPrototype.getter(obj, NULL);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_SystemBreak) {
ASSERT(args.length() == 0);
CPU::DebugBreak();
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugDisassembleFunction) {
#ifdef DEBUG
HandleScope scope(isolate);
ASSERT(args.length() == 1);
// Get the function and make sure it is compiled.
CONVERT_ARG_CHECKED(JSFunction, func, 0);
Handle<SharedFunctionInfo> shared(func->shared());
if (!EnsureCompiled(shared, KEEP_EXCEPTION)) {
return Failure::Exception();
}
func->code()->PrintLn();
#endif // DEBUG
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugDisassembleConstructor) {
#ifdef DEBUG
HandleScope scope(isolate);
ASSERT(args.length() == 1);
// Get the function and make sure it is compiled.
CONVERT_ARG_CHECKED(JSFunction, func, 0);
Handle<SharedFunctionInfo> shared(func->shared());
if (!EnsureCompiled(shared, KEEP_EXCEPTION)) {
return Failure::Exception();
}
shared->construct_stub()->PrintLn();
#endif // DEBUG
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_FunctionGetInferredName) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
CONVERT_CHECKED(JSFunction, f, args[0]);
return f->shared()->inferred_name();
}
static int FindSharedFunctionInfosForScript(Script* script,
FixedArray* buffer) {
AssertNoAllocation no_allocations;
int counter = 0;
int buffer_size = buffer->length();
HeapIterator iterator;
for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
ASSERT(obj != NULL);
if (!obj->IsSharedFunctionInfo()) {
continue;
}
SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
if (shared->script() != script) {
continue;
}
if (counter < buffer_size) {
buffer->set(counter, shared);
}
counter++;
}
return counter;
}
// For a script finds all SharedFunctionInfo's in the heap that points
// to this script. Returns JSArray of SharedFunctionInfo wrapped
// in OpaqueReferences.
RUNTIME_FUNCTION(MaybeObject*,
Runtime_LiveEditFindSharedFunctionInfosForScript) {
ASSERT(args.length() == 1);
HandleScope scope(isolate);
CONVERT_CHECKED(JSValue, script_value, args[0]);
Handle<Script> script = Handle<Script>(Script::cast(script_value->value()));
const int kBufferSize = 32;
Handle<FixedArray> array;
array = isolate->factory()->NewFixedArray(kBufferSize);
int number = FindSharedFunctionInfosForScript(*script, *array);
if (number > kBufferSize) {
array = isolate->factory()->NewFixedArray(number);
FindSharedFunctionInfosForScript(*script, *array);
}
Handle<JSArray> result = isolate->factory()->NewJSArrayWithElements(array);
result->set_length(Smi::FromInt(number));
LiveEdit::WrapSharedFunctionInfos(result);
return *result;
}
// For a script calculates compilation information about all its functions.
// The script source is explicitly specified by the second argument.
// The source of the actual script is not used, however it is important that
// all generated code keeps references to this particular instance of script.
// Returns a JSArray of compilation infos. The array is ordered so that
// each function with all its descendant is always stored in a continues range
// with the function itself going first. The root function is a script function.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditGatherCompileInfo) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_CHECKED(JSValue, script, args[0]);
CONVERT_ARG_CHECKED(String, source, 1);
Handle<Script> script_handle = Handle<Script>(Script::cast(script->value()));
JSArray* result = LiveEdit::GatherCompileInfo(script_handle, source);
if (isolate->has_pending_exception()) {
return Failure::Exception();
}
return result;
}
// Changes the source of the script to a new_source.
// If old_script_name is provided (i.e. is a String), also creates a copy of
// the script with its original source and sends notification to debugger.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditReplaceScript) {
ASSERT(args.length() == 3);
HandleScope scope(isolate);
CONVERT_CHECKED(JSValue, original_script_value, args[0]);
CONVERT_ARG_CHECKED(String, new_source, 1);
Handle<Object> old_script_name(args[2], isolate);
CONVERT_CHECKED(Script, original_script_pointer,
original_script_value->value());
Handle<Script> original_script(original_script_pointer);
Object* old_script = LiveEdit::ChangeScriptSource(original_script,
new_source,
old_script_name);
if (old_script->IsScript()) {
Handle<Script> script_handle(Script::cast(old_script));
return *(GetScriptWrapper(script_handle));
} else {
return isolate->heap()->null_value();
}
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditFunctionSourceUpdated) {
ASSERT(args.length() == 1);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSArray, shared_info, 0);
return LiveEdit::FunctionSourceUpdated(shared_info);
}
// Replaces code of SharedFunctionInfo with a new one.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditReplaceFunctionCode) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSArray, new_compile_info, 0);
CONVERT_ARG_CHECKED(JSArray, shared_info, 1);
return LiveEdit::ReplaceFunctionCode(new_compile_info, shared_info);
}
// Connects SharedFunctionInfo to another script.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditFunctionSetScript) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
Handle<Object> function_object(args[0], isolate);
Handle<Object> script_object(args[1], isolate);
if (function_object->IsJSValue()) {
Handle<JSValue> function_wrapper = Handle<JSValue>::cast(function_object);
if (script_object->IsJSValue()) {
CONVERT_CHECKED(Script, script, JSValue::cast(*script_object)->value());
script_object = Handle<Object>(script, isolate);
}
LiveEdit::SetFunctionScript(function_wrapper, script_object);
} else {
// Just ignore this. We may not have a SharedFunctionInfo for some functions
// and we check it in this function.
}
return isolate->heap()->undefined_value();
}
// In a code of a parent function replaces original function as embedded object
// with a substitution one.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditReplaceRefToNestedFunction) {
ASSERT(args.length() == 3);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSValue, parent_wrapper, 0);
CONVERT_ARG_CHECKED(JSValue, orig_wrapper, 1);
CONVERT_ARG_CHECKED(JSValue, subst_wrapper, 2);
LiveEdit::ReplaceRefToNestedFunction(parent_wrapper, orig_wrapper,
subst_wrapper);
return isolate->heap()->undefined_value();
}
// Updates positions of a shared function info (first parameter) according
// to script source change. Text change is described in second parameter as
// array of groups of 3 numbers:
// (change_begin, change_end, change_end_new_position).
// Each group describes a change in text; groups are sorted by change_begin.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditPatchFunctionPositions) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSArray, shared_array, 0);
CONVERT_ARG_CHECKED(JSArray, position_change_array, 1);
return LiveEdit::PatchFunctionPositions(shared_array, position_change_array);
}
// For array of SharedFunctionInfo's (each wrapped in JSValue)
// checks that none of them have activations on stacks (of any thread).
// Returns array of the same length with corresponding results of
// LiveEdit::FunctionPatchabilityStatus type.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditCheckAndDropActivations) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSArray, shared_array, 0);
CONVERT_BOOLEAN_CHECKED(do_drop, args[1]);
return *LiveEdit::CheckAndDropActivations(shared_array, do_drop);
}
// Compares 2 strings line-by-line, then token-wise and returns diff in form
// of JSArray of triplets (pos1, pos1_end, pos2_end) describing list
// of diff chunks.
RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditCompareStrings) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(String, s1, 0);
CONVERT_ARG_CHECKED(String, s2, 1);
return *LiveEdit::CompareStrings(s1, s2);
}
// A testing entry. Returns statement position which is the closest to
// source_position.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetFunctionCodePositionFromSource) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
CONVERT_NUMBER_CHECKED(int32_t, source_position, Int32, args[1]);
Handle<Code> code(function->code(), isolate);
if (code->kind() != Code::FUNCTION &&
code->kind() != Code::OPTIMIZED_FUNCTION) {
return isolate->heap()->undefined_value();
}
RelocIterator it(*code, RelocInfo::ModeMask(RelocInfo::STATEMENT_POSITION));
int closest_pc = 0;
int distance = kMaxInt;
while (!it.done()) {
int statement_position = static_cast<int>(it.rinfo()->data());
// Check if this break point is closer that what was previously found.
if (source_position <= statement_position &&
statement_position - source_position < distance) {
closest_pc =
static_cast<int>(it.rinfo()->pc() - code->instruction_start());
distance = statement_position - source_position;
// Check whether we can't get any closer.
if (distance == 0) break;
}
it.next();
}
return Smi::FromInt(closest_pc);
}
// Calls specified function with or without entering the debugger.
// This is used in unit tests to run code as if debugger is entered or simply
// to have a stack with C++ frame in the middle.
RUNTIME_FUNCTION(MaybeObject*, Runtime_ExecuteInDebugContext) {
ASSERT(args.length() == 2);
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(JSFunction, function, 0);
CONVERT_BOOLEAN_CHECKED(without_debugger, args[1]);
Handle<Object> result;
bool pending_exception;
{
if (without_debugger) {
result = Execution::Call(function, isolate->global(), 0, NULL,
&pending_exception);
} else {
EnterDebugger enter_debugger;
result = Execution::Call(function, isolate->global(), 0, NULL,
&pending_exception);
}
}
if (!pending_exception) {
return *result;
} else {
return Failure::Exception();
}
}
// Sets a v8 flag.
RUNTIME_FUNCTION(MaybeObject*, Runtime_SetFlags) {
CONVERT_CHECKED(String, arg, args[0]);
SmartPointer<char> flags =
arg->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
FlagList::SetFlagsFromString(*flags, StrLength(*flags));
return isolate->heap()->undefined_value();
}
// Performs a GC.
// Presently, it only does a full GC.
RUNTIME_FUNCTION(MaybeObject*, Runtime_CollectGarbage) {
isolate->heap()->CollectAllGarbage(true);
return isolate->heap()->undefined_value();
}
// Gets the current heap usage.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetHeapUsage) {
int usage = static_cast<int>(isolate->heap()->SizeOfObjects());
if (!Smi::IsValid(usage)) {
return *isolate->factory()->NewNumberFromInt(usage);
}
return Smi::FromInt(usage);
}
// Captures a live object list from the present heap.
RUNTIME_FUNCTION(MaybeObject*, Runtime_HasLOLEnabled) {
#ifdef LIVE_OBJECT_LIST
return isolate->heap()->true_value();
#else
return isolate->heap()->false_value();
#endif
}
// Captures a live object list from the present heap.
RUNTIME_FUNCTION(MaybeObject*, Runtime_CaptureLOL) {
#ifdef LIVE_OBJECT_LIST
return LiveObjectList::Capture();
#else
return isolate->heap()->undefined_value();
#endif
}
// Deletes the specified live object list.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DeleteLOL) {
#ifdef LIVE_OBJECT_LIST
CONVERT_SMI_CHECKED(id, args[0]);
bool success = LiveObjectList::Delete(id);
return success ? isolate->heap()->true_value() :
isolate->heap()->false_value();
#else
return isolate->heap()->undefined_value();
#endif
}
// Generates the response to a debugger request for a dump of the objects
// contained in the difference between the captured live object lists
// specified by id1 and id2.
// If id1 is 0 (i.e. not a valid lol), then the whole of lol id2 will be
// dumped.
RUNTIME_FUNCTION(MaybeObject*, Runtime_DumpLOL) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_SMI_CHECKED(id1, args[0]);
CONVERT_SMI_CHECKED(id2, args[1]);
CONVERT_SMI_CHECKED(start, args[2]);
CONVERT_SMI_CHECKED(count, args[3]);
CONVERT_ARG_CHECKED(JSObject, filter_obj, 4);
EnterDebugger enter_debugger;
return LiveObjectList::Dump(id1, id2, start, count, filter_obj);
#else
return isolate->heap()->undefined_value();
#endif
}
// Gets the specified object as requested by the debugger.
// This is only used for obj ids shown in live object lists.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLOLObj) {
#ifdef LIVE_OBJECT_LIST
CONVERT_SMI_CHECKED(obj_id, args[0]);
Object* result = LiveObjectList::GetObj(obj_id);
return result;
#else
return isolate->heap()->undefined_value();
#endif
}
// Gets the obj id for the specified address if valid.
// This is only used for obj ids shown in live object lists.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLOLObjId) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_ARG_CHECKED(String, address, 0);
Object* result = LiveObjectList::GetObjId(address);
return result;
#else
return isolate->heap()->undefined_value();
#endif
}
// Gets the retainers that references the specified object alive.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLOLObjRetainers) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_SMI_CHECKED(obj_id, args[0]);
RUNTIME_ASSERT(args[1]->IsUndefined() || args[1]->IsJSObject());
RUNTIME_ASSERT(args[2]->IsUndefined() || args[2]->IsBoolean());
RUNTIME_ASSERT(args[3]->IsUndefined() || args[3]->IsSmi());
RUNTIME_ASSERT(args[4]->IsUndefined() || args[4]->IsSmi());
CONVERT_ARG_CHECKED(JSObject, filter_obj, 5);
Handle<JSObject> instance_filter;
if (args[1]->IsJSObject()) {
instance_filter = args.at<JSObject>(1);
}
bool verbose = false;
if (args[2]->IsBoolean()) {
verbose = args[2]->IsTrue();
}
int start = 0;
if (args[3]->IsSmi()) {
start = Smi::cast(args[3])->value();
}
int limit = Smi::kMaxValue;
if (args[4]->IsSmi()) {
limit = Smi::cast(args[4])->value();
}
return LiveObjectList::GetObjRetainers(obj_id,
instance_filter,
verbose,
start,
limit,
filter_obj);
#else
return isolate->heap()->undefined_value();
#endif
}
// Gets the reference path between 2 objects.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetLOLPath) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_SMI_CHECKED(obj_id1, args[0]);
CONVERT_SMI_CHECKED(obj_id2, args[1]);
RUNTIME_ASSERT(args[2]->IsUndefined() || args[2]->IsJSObject());
Handle<JSObject> instance_filter;
if (args[2]->IsJSObject()) {
instance_filter = args.at<JSObject>(2);
}
Object* result =
LiveObjectList::GetPath(obj_id1, obj_id2, instance_filter);
return result;
#else
return isolate->heap()->undefined_value();
#endif
}
// Generates the response to a debugger request for a list of all
// previously captured live object lists.
RUNTIME_FUNCTION(MaybeObject*, Runtime_InfoLOL) {
#ifdef LIVE_OBJECT_LIST
CONVERT_SMI_CHECKED(start, args[0]);
CONVERT_SMI_CHECKED(count, args[1]);
return LiveObjectList::Info(start, count);
#else
return isolate->heap()->undefined_value();
#endif
}
// Gets a dump of the specified object as requested by the debugger.
// This is only used for obj ids shown in live object lists.
RUNTIME_FUNCTION(MaybeObject*, Runtime_PrintLOLObj) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_SMI_CHECKED(obj_id, args[0]);
Object* result = LiveObjectList::PrintObj(obj_id);
return result;
#else
return isolate->heap()->undefined_value();
#endif
}
// Resets and releases all previously captured live object lists.
RUNTIME_FUNCTION(MaybeObject*, Runtime_ResetLOL) {
#ifdef LIVE_OBJECT_LIST
LiveObjectList::Reset();
return isolate->heap()->undefined_value();
#else
return isolate->heap()->undefined_value();
#endif
}
// Generates the response to a debugger request for a summary of the types
// of objects in the difference between the captured live object lists
// specified by id1 and id2.
// If id1 is 0 (i.e. not a valid lol), then the whole of lol id2 will be
// summarized.
RUNTIME_FUNCTION(MaybeObject*, Runtime_SummarizeLOL) {
#ifdef LIVE_OBJECT_LIST
HandleScope scope;
CONVERT_SMI_CHECKED(id1, args[0]);
CONVERT_SMI_CHECKED(id2, args[1]);
CONVERT_ARG_CHECKED(JSObject, filter_obj, 2);
EnterDebugger enter_debugger;
return LiveObjectList::Summarize(id1, id2, filter_obj);
#else
return isolate->heap()->undefined_value();
#endif
}
#endif // ENABLE_DEBUGGER_SUPPORT
#ifdef ENABLE_LOGGING_AND_PROFILING
RUNTIME_FUNCTION(MaybeObject*, Runtime_ProfilerResume) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(Smi, smi_modules, args[0]);
CONVERT_CHECKED(Smi, smi_tag, args[1]);
v8::V8::ResumeProfilerEx(smi_modules->value(), smi_tag->value());
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_ProfilerPause) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(Smi, smi_modules, args[0]);
CONVERT_CHECKED(Smi, smi_tag, args[1]);
v8::V8::PauseProfilerEx(smi_modules->value(), smi_tag->value());
return isolate->heap()->undefined_value();
}
#endif // ENABLE_LOGGING_AND_PROFILING
// Finds the script object from the script data. NOTE: This operation uses
// heap traversal to find the function generated for the source position
// for the requested break point. For lazily compiled functions several heap
// traversals might be required rendering this operation as a rather slow
// operation. However for setting break points which is normally done through
// some kind of user interaction the performance is not crucial.
static Handle<Object> Runtime_GetScriptFromScriptName(
Handle<String> script_name) {
// Scan the heap for Script objects to find the script with the requested
// script data.
Handle<Script> script;
HeapIterator iterator;
HeapObject* obj = NULL;
while (script.is_null() && ((obj = iterator.next()) != NULL)) {
// If a script is found check if it has the script data requested.
if (obj->IsScript()) {
if (Script::cast(obj)->name()->IsString()) {
if (String::cast(Script::cast(obj)->name())->Equals(*script_name)) {
script = Handle<Script>(Script::cast(obj));
}
}
}
}
// If no script with the requested script data is found return undefined.
if (script.is_null()) return FACTORY->undefined_value();
// Return the script found.
return GetScriptWrapper(script);
}
// Get the script object from script data. NOTE: Regarding performance
// see the NOTE for GetScriptFromScriptData.
// args[0]: script data for the script to find the source for
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetScript) {
HandleScope scope(isolate);
ASSERT(args.length() == 1);
CONVERT_CHECKED(String, script_name, args[0]);
// Find the requested script.
Handle<Object> result =
Runtime_GetScriptFromScriptName(Handle<String>(script_name));
return *result;
}
// Determines whether the given stack frame should be displayed in
// a stack trace. The caller is the error constructor that asked
// for the stack trace to be collected. The first time a construct
// call to this function is encountered it is skipped. The seen_caller
// in/out parameter is used to remember if the caller has been seen
// yet.
static bool ShowFrameInStackTrace(StackFrame* raw_frame, Object* caller,
bool* seen_caller) {
// Only display JS frames.
if (!raw_frame->is_java_script())
return false;
JavaScriptFrame* frame = JavaScriptFrame::cast(raw_frame);
Object* raw_fun = frame->function();
// Not sure when this can happen but skip it just in case.
if (!raw_fun->IsJSFunction())
return false;
if ((raw_fun == caller) && !(*seen_caller)) {
*seen_caller = true;
return false;
}
// Skip all frames until we've seen the caller. Also, skip the most
// obvious builtin calls. Some builtin calls (such as Number.ADD
// which is invoked using 'call') are very difficult to recognize
// so we're leaving them in for now.
return *seen_caller && !frame->receiver()->IsJSBuiltinsObject();
}
// Collect the raw data for a stack trace. Returns an array of 4
// element segments each containing a receiver, function, code and
// native code offset.
RUNTIME_FUNCTION(MaybeObject*, Runtime_CollectStackTrace) {
ASSERT_EQ(args.length(), 2);
Handle<Object> caller = args.at<Object>(0);
CONVERT_NUMBER_CHECKED(int32_t, limit, Int32, args[1]);
HandleScope scope(isolate);
Factory* factory = isolate->factory();
limit = Max(limit, 0); // Ensure that limit is not negative.
int initial_size = Min(limit, 10);
Handle<FixedArray> elements =
factory->NewFixedArrayWithHoles(initial_size * 4);
StackFrameIterator iter(isolate);
// If the caller parameter is a function we skip frames until we're
// under it before starting to collect.
bool seen_caller = !caller->IsJSFunction();
int cursor = 0;
int frames_seen = 0;
while (!iter.done() && frames_seen < limit) {
StackFrame* raw_frame = iter.frame();
if (ShowFrameInStackTrace(raw_frame, *caller, &seen_caller)) {
frames_seen++;
JavaScriptFrame* frame = JavaScriptFrame::cast(raw_frame);
// Set initial size to the maximum inlining level + 1 for the outermost
// function.
List<FrameSummary> frames(Compiler::kMaxInliningLevels + 1);
frame->Summarize(&frames);
for (int i = frames.length() - 1; i >= 0; i--) {
if (cursor + 4 > elements->length()) {
int new_capacity = JSObject::NewElementsCapacity(elements->length());
Handle<FixedArray> new_elements =
factory->NewFixedArrayWithHoles(new_capacity);
for (int i = 0; i < cursor; i++) {
new_elements->set(i, elements->get(i));
}
elements = new_elements;
}
ASSERT(cursor + 4 <= elements->length());
Handle<Object> recv = frames[i].receiver();
Handle<JSFunction> fun = frames[i].function();
Handle<Code> code = frames[i].code();
Handle<Smi> offset(Smi::FromInt(frames[i].offset()));
elements->set(cursor++, *recv);
elements->set(cursor++, *fun);
elements->set(cursor++, *code);
elements->set(cursor++, *offset);
}
}
iter.Advance();
}
Handle<JSArray> result = factory->NewJSArrayWithElements(elements);
result->set_length(Smi::FromInt(cursor));
return *result;
}
// Returns V8 version as a string.
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetV8Version) {
ASSERT_EQ(args.length(), 0);
NoHandleAllocation ha;
const char* version_string = v8::V8::GetVersion();
return isolate->heap()->AllocateStringFromAscii(CStrVector(version_string),
NOT_TENURED);
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_Abort) {
ASSERT(args.length() == 2);
OS::PrintError("abort: %s\n", reinterpret_cast<char*>(args[0]) +
Smi::cast(args[1])->value());
isolate->PrintStack();
OS::Abort();
UNREACHABLE();
return NULL;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_GetFromCache) {
// This is only called from codegen, so checks might be more lax.
CONVERT_CHECKED(JSFunctionResultCache, cache, args[0]);
Object* key = args[1];
int finger_index = cache->finger_index();
Object* o = cache->get(finger_index);
if (o == key) {
// The fastest case: hit the same place again.
return cache->get(finger_index + 1);
}
for (int i = finger_index - 2;
i >= JSFunctionResultCache::kEntriesIndex;
i -= 2) {
o = cache->get(i);
if (o == key) {
cache->set_finger_index(i);
return cache->get(i + 1);
}
}
int size = cache->size();
ASSERT(size <= cache->length());
for (int i = size - 2; i > finger_index; i -= 2) {
o = cache->get(i);
if (o == key) {
cache->set_finger_index(i);
return cache->get(i + 1);
}
}
// There is no value in the cache. Invoke the function and cache result.
HandleScope scope(isolate);
Handle<JSFunctionResultCache> cache_handle(cache);
Handle<Object> key_handle(key);
Handle<Object> value;
{
Handle<JSFunction> factory(JSFunction::cast(
cache_handle->get(JSFunctionResultCache::kFactoryIndex)));
// TODO(antonm): consider passing a receiver when constructing a cache.
Handle<Object> receiver(isolate->global_context()->global());
// This handle is nor shared, nor used later, so it's safe.
Object** argv[] = { key_handle.location() };
bool pending_exception = false;
value = Execution::Call(factory,
receiver,
1,
argv,
&pending_exception);
if (pending_exception) return Failure::Exception();
}
#ifdef DEBUG
cache_handle->JSFunctionResultCacheVerify();
#endif
// Function invocation may have cleared the cache. Reread all the data.
finger_index = cache_handle->finger_index();
size = cache_handle->size();
// If we have spare room, put new data into it, otherwise evict post finger
// entry which is likely to be the least recently used.
int index = -1;
if (size < cache_handle->length()) {
cache_handle->set_size(size + JSFunctionResultCache::kEntrySize);
index = size;
} else {
index = finger_index + JSFunctionResultCache::kEntrySize;
if (index == cache_handle->length()) {
index = JSFunctionResultCache::kEntriesIndex;
}
}
ASSERT(index % 2 == 0);
ASSERT(index >= JSFunctionResultCache::kEntriesIndex);
ASSERT(index < cache_handle->length());
cache_handle->set(index, *key_handle);
cache_handle->set(index + 1, *value);
cache_handle->set_finger_index(index);
#ifdef DEBUG
cache_handle->JSFunctionResultCacheVerify();
#endif
return *value;
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_NewMessageObject) {
HandleScope scope(isolate);
CONVERT_ARG_CHECKED(String, type, 0);
CONVERT_ARG_CHECKED(JSArray, arguments, 1);
return *isolate->factory()->NewJSMessageObject(
type,
arguments,
0,
0,
isolate->factory()->undefined_value(),
isolate->factory()->undefined_value(),
isolate->factory()->undefined_value());
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MessageGetType) {
CONVERT_CHECKED(JSMessageObject, message, args[0]);
return message->type();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MessageGetArguments) {
CONVERT_CHECKED(JSMessageObject, message, args[0]);
return message->arguments();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MessageGetStartPosition) {
CONVERT_CHECKED(JSMessageObject, message, args[0]);
return Smi::FromInt(message->start_position());
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MessageGetScript) {
CONVERT_CHECKED(JSMessageObject, message, args[0]);
return message->script();
}
#ifdef DEBUG
// ListNatives is ONLY used by the fuzz-natives.js in debug mode
// Exclude the code in release mode.
RUNTIME_FUNCTION(MaybeObject*, Runtime_ListNatives) {
ASSERT(args.length() == 0);
HandleScope scope;
#define COUNT_ENTRY(Name, argc, ressize) + 1
int entry_count = 0
RUNTIME_FUNCTION_LIST(COUNT_ENTRY)
INLINE_FUNCTION_LIST(COUNT_ENTRY)
INLINE_RUNTIME_FUNCTION_LIST(COUNT_ENTRY);
#undef COUNT_ENTRY
Factory* factory = isolate->factory();
Handle<FixedArray> elements = factory->NewFixedArray(entry_count);
int index = 0;
bool inline_runtime_functions = false;
#define ADD_ENTRY(Name, argc, ressize) \
{ \
HandleScope inner; \
Handle<String> name; \
/* Inline runtime functions have an underscore in front of the name. */ \
if (inline_runtime_functions) { \
name = factory->NewStringFromAscii( \
Vector<const char>("_" #Name, StrLength("_" #Name))); \
} else { \
name = factory->NewStringFromAscii( \
Vector<const char>(#Name, StrLength(#Name))); \
} \
Handle<FixedArray> pair_elements = factory->NewFixedArray(2); \
pair_elements->set(0, *name); \
pair_elements->set(1, Smi::FromInt(argc)); \
Handle<JSArray> pair = factory->NewJSArrayWithElements(pair_elements); \
elements->set(index++, *pair); \
}
inline_runtime_functions = false;
RUNTIME_FUNCTION_LIST(ADD_ENTRY)
inline_runtime_functions = true;
INLINE_FUNCTION_LIST(ADD_ENTRY)
INLINE_RUNTIME_FUNCTION_LIST(ADD_ENTRY)
#undef ADD_ENTRY
ASSERT_EQ(index, entry_count);
Handle<JSArray> result = factory->NewJSArrayWithElements(elements);
return *result;
}
#endif
RUNTIME_FUNCTION(MaybeObject*, Runtime_Log) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, format, args[0]);
CONVERT_CHECKED(JSArray, elms, args[1]);
Vector<const char> chars = format->ToAsciiVector();
LOGGER->LogRuntime(chars, elms);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(MaybeObject*, Runtime_IS_VAR) {
UNREACHABLE(); // implemented as macro in the parser
return NULL;
}
// ----------------------------------------------------------------------------
// Implementation of Runtime
#define F(name, number_of_args, result_size) \
{ Runtime::k##name, Runtime::RUNTIME, #name, \
FUNCTION_ADDR(Runtime_##name), number_of_args, result_size },
#define I(name, number_of_args, result_size) \
{ Runtime::kInline##name, Runtime::INLINE, \
"_" #name, NULL, number_of_args, result_size },
static const Runtime::Function kIntrinsicFunctions[] = {
RUNTIME_FUNCTION_LIST(F)
INLINE_FUNCTION_LIST(I)
INLINE_RUNTIME_FUNCTION_LIST(I)
};
MaybeObject* Runtime::InitializeIntrinsicFunctionNames(Heap* heap,
Object* dictionary) {
ASSERT(Isolate::Current()->heap() == heap);
ASSERT(dictionary != NULL);
ASSERT(StringDictionary::cast(dictionary)->NumberOfElements() == 0);
for (int i = 0; i < kNumFunctions; ++i) {
Object* name_symbol;
{ MaybeObject* maybe_name_symbol =
heap->LookupAsciiSymbol(kIntrinsicFunctions[i].name);
if (!maybe_name_symbol->ToObject(&name_symbol)) return maybe_name_symbol;
}
StringDictionary* string_dictionary = StringDictionary::cast(dictionary);
{ MaybeObject* maybe_dictionary = string_dictionary->Add(
String::cast(name_symbol),
Smi::FromInt(i),
PropertyDetails(NONE, NORMAL));
if (!maybe_dictionary->ToObject(&dictionary)) {
// Non-recoverable failure. Calling code must restart heap
// initialization.
return maybe_dictionary;
}
}
}
return dictionary;
}
const Runtime::Function* Runtime::FunctionForSymbol(Handle<String> name) {
Heap* heap = name->GetHeap();
int entry = heap->intrinsic_function_names()->FindEntry(*name);
if (entry != kNotFound) {
Object* smi_index = heap->intrinsic_function_names()->ValueAt(entry);
int function_index = Smi::cast(smi_index)->value();
return &(kIntrinsicFunctions[function_index]);
}
return NULL;
}
const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
return &(kIntrinsicFunctions[static_cast<int>(id)]);
}
void Runtime::PerformGC(Object* result) {
Isolate* isolate = Isolate::Current();
Failure* failure = Failure::cast(result);
if (failure->IsRetryAfterGC()) {
// Try to do a garbage collection; ignore it if it fails. The C
// entry stub will throw an out-of-memory exception in that case.
isolate->heap()->CollectGarbage(failure->allocation_space());
} else {
// Handle last resort GC and make sure to allow future allocations
// to grow the heap without causing GCs (if possible).
isolate->counters()->gc_last_resort_from_js()->Increment();
isolate->heap()->CollectAllGarbage(false);
}
}
} } // namespace v8::internal