/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "entrypoints/entrypoint_utils.h"
#include "class_linker-inl.h"
#include "dex_file-inl.h"
#include "gc/accounting/card_table-inl.h"
#include "mirror/art_field-inl.h"
#include "mirror/art_method-inl.h"
#include "mirror/class-inl.h"
#include "mirror/object-inl.h"
#include "object_utils.h"
#include "mirror/object_array-inl.h"
#include "mirror/proxy.h"
#include "reflection.h"
#include "scoped_thread_state_change.h"
#include "ScopedLocalRef.h"
#include "well_known_classes.h"
namespace art {
// Helper function to allocate array for FILLED_NEW_ARRAY.
mirror::Array* CheckAndAllocArrayFromCode(uint32_t type_idx, mirror::ArtMethod* referrer,
int32_t component_count, Thread* self,
bool access_check) {
if (UNLIKELY(component_count < 0)) {
ThrowNegativeArraySizeException(component_count);
return NULL; // Failure
}
mirror::Class* klass = referrer->GetDexCacheResolvedTypes()->Get(type_idx);
if (UNLIKELY(klass == NULL)) { // Not in dex cache so try to resolve
klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, referrer);
if (klass == NULL) { // Error
DCHECK(self->IsExceptionPending());
return NULL; // Failure
}
}
if (UNLIKELY(klass->IsPrimitive() && !klass->IsPrimitiveInt())) {
if (klass->IsPrimitiveLong() || klass->IsPrimitiveDouble()) {
ThrowRuntimeException("Bad filled array request for type %s",
PrettyDescriptor(klass).c_str());
} else {
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
DCHECK(throw_location.GetMethod() == referrer);
self->ThrowNewExceptionF(throw_location, "Ljava/lang/InternalError;",
"Found type %s; filled-new-array not implemented for anything but \'int\'",
PrettyDescriptor(klass).c_str());
}
return NULL; // Failure
} else {
if (access_check) {
mirror::Class* referrer_klass = referrer->GetDeclaringClass();
if (UNLIKELY(!referrer_klass->CanAccess(klass))) {
ThrowIllegalAccessErrorClass(referrer_klass, klass);
return NULL; // Failure
}
}
DCHECK(klass->IsArrayClass()) << PrettyClass(klass);
return mirror::Array::Alloc(self, klass, component_count);
}
}
mirror::ArtField* FindFieldFromCode(uint32_t field_idx, const mirror::ArtMethod* referrer,
Thread* self, FindFieldType type, size_t expected_size,
bool access_check) {
bool is_primitive;
bool is_set;
bool is_static;
switch (type) {
case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break;
case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break;
case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break;
case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break;
case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break;
case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break;
case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break;
case StaticPrimitiveWrite: // Keep GCC happy by having a default handler, fall-through.
default: is_primitive = true; is_set = true; is_static = true; break;
}
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
mirror::ArtField* resolved_field = class_linker->ResolveField(field_idx, referrer, is_static);
if (UNLIKELY(resolved_field == NULL)) {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind.
return NULL; // Failure.
}
mirror::Class* fields_class = resolved_field->GetDeclaringClass();
if (access_check) {
if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
ThrowIncompatibleClassChangeErrorField(resolved_field, is_static, referrer);
return NULL;
}
mirror::Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(fields_class) ||
!referring_class->CanAccessMember(fields_class,
resolved_field->GetAccessFlags()))) {
// The referring class can't access the resolved field, this may occur as a result of a
// protected field being made public by a sub-class. Resort to the dex file to determine
// the correct class for the access check.
const DexFile& dex_file = *referring_class->GetDexCache()->GetDexFile();
fields_class = class_linker->ResolveType(dex_file,
dex_file.GetFieldId(field_idx).class_idx_,
referring_class);
if (UNLIKELY(!referring_class->CanAccess(fields_class))) {
ThrowIllegalAccessErrorClass(referring_class, fields_class);
return NULL; // failure
} else if (UNLIKELY(!referring_class->CanAccessMember(fields_class,
resolved_field->GetAccessFlags()))) {
ThrowIllegalAccessErrorField(referring_class, resolved_field);
return NULL; // failure
}
}
if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) {
ThrowIllegalAccessErrorFinalField(referrer, resolved_field);
return NULL; // failure
} else {
FieldHelper fh(resolved_field);
if (UNLIKELY(fh.IsPrimitiveType() != is_primitive ||
fh.FieldSize() != expected_size)) {
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
DCHECK(throw_location.GetMethod() == referrer);
self->ThrowNewExceptionF(throw_location, "Ljava/lang/NoSuchFieldError;",
"Attempted read of %zd-bit %s on field '%s'",
expected_size * (32 / sizeof(int32_t)),
is_primitive ? "primitive" : "non-primitive",
PrettyField(resolved_field, true).c_str());
return NULL; // failure
}
}
}
if (!is_static) {
// instance fields must be being accessed on an initialized class
return resolved_field;
} else {
// If the class is initialized we're done.
if (fields_class->IsInitialized()) {
return resolved_field;
} else if (Runtime::Current()->GetClassLinker()->EnsureInitialized(fields_class, true, true)) {
// Otherwise let's ensure the class is initialized before resolving the field.
return resolved_field;
} else {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind
return NULL; // failure
}
}
}
// Slow path method resolution
mirror::ArtMethod* FindMethodFromCode(uint32_t method_idx, mirror::Object* this_object,
mirror::ArtMethod* referrer,
Thread* self, bool access_check, InvokeType type) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
bool is_direct = type == kStatic || type == kDirect;
mirror::ArtMethod* resolved_method = class_linker->ResolveMethod(method_idx, referrer, type);
if (UNLIKELY(resolved_method == NULL)) {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind.
return NULL; // Failure.
} else if (UNLIKELY(this_object == NULL && type != kStatic)) {
// Maintain interpreter-like semantics where NullPointerException is thrown
// after potential NoSuchMethodError from class linker.
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
DCHECK(referrer == throw_location.GetMethod());
ThrowNullPointerExceptionForMethodAccess(throw_location, method_idx, type);
return NULL; // Failure.
} else {
if (!access_check) {
if (is_direct) {
return resolved_method;
} else if (type == kInterface) {
mirror::ArtMethod* interface_method =
this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
if (UNLIKELY(interface_method == NULL)) {
ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(resolved_method, this_object,
referrer);
return NULL; // Failure.
} else {
return interface_method;
}
} else {
mirror::ObjectArray<mirror::ArtMethod>* vtable;
uint16_t vtable_index = resolved_method->GetMethodIndex();
if (type == kSuper) {
vtable = referrer->GetDeclaringClass()->GetSuperClass()->GetVTable();
} else {
vtable = this_object->GetClass()->GetVTable();
}
// TODO: eliminate bounds check?
return vtable->Get(vtable_index);
}
} else {
// Incompatible class change should have been handled in resolve method.
if (UNLIKELY(resolved_method->CheckIncompatibleClassChange(type))) {
ThrowIncompatibleClassChangeError(type, resolved_method->GetInvokeType(), resolved_method,
referrer);
return NULL; // Failure.
}
mirror::Class* methods_class = resolved_method->GetDeclaringClass();
mirror::Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(methods_class) ||
!referring_class->CanAccessMember(methods_class,
resolved_method->GetAccessFlags()))) {
// The referring class can't access the resolved method, this may occur as a result of a
// protected method being made public by implementing an interface that re-declares the
// method public. Resort to the dex file to determine the correct class for the access check
const DexFile& dex_file = *referring_class->GetDexCache()->GetDexFile();
methods_class = class_linker->ResolveType(dex_file,
dex_file.GetMethodId(method_idx).class_idx_,
referring_class);
if (UNLIKELY(!referring_class->CanAccess(methods_class))) {
ThrowIllegalAccessErrorClassForMethodDispatch(referring_class, methods_class,
referrer, resolved_method, type);
return NULL; // Failure.
} else if (UNLIKELY(!referring_class->CanAccessMember(methods_class,
resolved_method->GetAccessFlags()))) {
ThrowIllegalAccessErrorMethod(referring_class, resolved_method);
return NULL; // Failure.
}
}
if (is_direct) {
return resolved_method;
} else if (type == kInterface) {
mirror::ArtMethod* interface_method =
this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
if (UNLIKELY(interface_method == NULL)) {
ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(resolved_method, this_object,
referrer);
return NULL; // Failure.
} else {
return interface_method;
}
} else {
mirror::ObjectArray<mirror::ArtMethod>* vtable;
uint16_t vtable_index = resolved_method->GetMethodIndex();
if (type == kSuper) {
mirror::Class* super_class = referring_class->GetSuperClass();
if (LIKELY(super_class != NULL)) {
vtable = referring_class->GetSuperClass()->GetVTable();
} else {
vtable = NULL;
}
} else {
vtable = this_object->GetClass()->GetVTable();
}
if (LIKELY(vtable != NULL &&
vtable_index < static_cast<uint32_t>(vtable->GetLength()))) {
return vtable->GetWithoutChecks(vtable_index);
} else {
// Behavior to agree with that of the verifier.
MethodHelper mh(resolved_method);
ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), mh.GetName(),
mh.GetSignature());
return NULL; // Failure.
}
}
}
}
}
void ThrowStackOverflowError(Thread* self) {
if (self->IsHandlingStackOverflow()) {
LOG(ERROR) << "Recursive stack overflow.";
// We don't fail here because SetStackEndForStackOverflow will print better diagnostics.
}
if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) {
// Remove extra entry pushed onto second stack during method tracing.
Runtime::Current()->GetInstrumentation()->PopMethodForUnwind(self, false);
}
self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute.
JNIEnvExt* env = self->GetJniEnv();
std::string msg("stack size ");
msg += PrettySize(self->GetStackSize());
// Use low-level JNI routine and pre-baked error class to avoid class linking operations that
// would consume more stack.
int rc = ::art::ThrowNewException(env, WellKnownClasses::java_lang_StackOverflowError,
msg.c_str(), NULL);
if (rc != JNI_OK) {
// TODO: ThrowNewException failed presumably because of an OOME, we continue to throw the OOME
// or die in the CHECK below. We may want to throw a pre-baked StackOverflowError
// instead.
LOG(ERROR) << "Couldn't throw new StackOverflowError because JNI ThrowNew failed.";
CHECK(self->IsExceptionPending());
}
self->ResetDefaultStackEnd(); // Return to default stack size.
}
JValue InvokeProxyInvocationHandler(ScopedObjectAccessUnchecked& soa, const char* shorty,
jobject rcvr_jobj, jobject interface_method_jobj,
std::vector<jvalue>& args) {
DCHECK(soa.Env()->IsInstanceOf(rcvr_jobj, WellKnownClasses::java_lang_reflect_Proxy));
// Build argument array possibly triggering GC.
soa.Self()->AssertThreadSuspensionIsAllowable();
jobjectArray args_jobj = NULL;
const JValue zero;
if (args.size() > 0) {
args_jobj = soa.Env()->NewObjectArray(args.size(), WellKnownClasses::java_lang_Object, NULL);
if (args_jobj == NULL) {
CHECK(soa.Self()->IsExceptionPending());
return zero;
}
for (size_t i = 0; i < args.size(); ++i) {
if (shorty[i + 1] == 'L') {
jobject val = args.at(i).l;
soa.Env()->SetObjectArrayElement(args_jobj, i, val);
} else {
JValue jv;
jv.SetJ(args.at(i).j);
mirror::Object* val = BoxPrimitive(Primitive::GetType(shorty[i + 1]), jv);
if (val == NULL) {
CHECK(soa.Self()->IsExceptionPending());
return zero;
}
soa.Decode<mirror::ObjectArray<mirror::Object>* >(args_jobj)->Set(i, val);
}
}
}
// Call Proxy.invoke(Proxy proxy, ArtMethod method, Object[] args).
jvalue invocation_args[3];
invocation_args[0].l = rcvr_jobj;
invocation_args[1].l = interface_method_jobj;
invocation_args[2].l = args_jobj;
jobject result =
soa.Env()->CallStaticObjectMethodA(WellKnownClasses::java_lang_reflect_Proxy,
WellKnownClasses::java_lang_reflect_Proxy_invoke,
invocation_args);
// Unbox result and handle error conditions.
if (LIKELY(!soa.Self()->IsExceptionPending())) {
if (shorty[0] == 'V' || (shorty[0] == 'L' && result == NULL)) {
// Do nothing.
return zero;
} else {
mirror::Object* result_ref = soa.Decode<mirror::Object*>(result);
mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj);
mirror::ArtMethod* interface_method =
soa.Decode<mirror::ArtMethod*>(interface_method_jobj);
mirror::Class* result_type = MethodHelper(interface_method).GetReturnType();
mirror::ArtMethod* proxy_method;
if (interface_method->GetDeclaringClass()->IsInterface()) {
proxy_method = rcvr->GetClass()->FindVirtualMethodForInterface(interface_method);
} else {
// Proxy dispatch to a method defined in Object.
DCHECK(interface_method->GetDeclaringClass()->IsObjectClass());
proxy_method = interface_method;
}
ThrowLocation throw_location(rcvr, proxy_method, -1);
JValue result_unboxed;
if (!UnboxPrimitiveForResult(throw_location, result_ref, result_type, result_unboxed)) {
DCHECK(soa.Self()->IsExceptionPending());
return zero;
}
return result_unboxed;
}
} else {
// In the case of checked exceptions that aren't declared, the exception must be wrapped by
// a UndeclaredThrowableException.
mirror::Throwable* exception = soa.Self()->GetException(NULL);
if (exception->IsCheckedException()) {
mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj);
mirror::SynthesizedProxyClass* proxy_class =
down_cast<mirror::SynthesizedProxyClass*>(rcvr->GetClass());
mirror::ArtMethod* interface_method =
soa.Decode<mirror::ArtMethod*>(interface_method_jobj);
mirror::ArtMethod* proxy_method =
rcvr->GetClass()->FindVirtualMethodForInterface(interface_method);
int throws_index = -1;
size_t num_virt_methods = proxy_class->NumVirtualMethods();
for (size_t i = 0; i < num_virt_methods; i++) {
if (proxy_class->GetVirtualMethod(i) == proxy_method) {
throws_index = i;
break;
}
}
CHECK_NE(throws_index, -1);
mirror::ObjectArray<mirror::Class>* declared_exceptions = proxy_class->GetThrows()->Get(throws_index);
mirror::Class* exception_class = exception->GetClass();
bool declares_exception = false;
for (int i = 0; i < declared_exceptions->GetLength() && !declares_exception; i++) {
mirror::Class* declared_exception = declared_exceptions->Get(i);
declares_exception = declared_exception->IsAssignableFrom(exception_class);
}
if (!declares_exception) {
ThrowLocation throw_location(rcvr, proxy_method, -1);
soa.Self()->ThrowNewWrappedException(throw_location,
"Ljava/lang/reflect/UndeclaredThrowableException;",
NULL);
}
}
return zero;
}
}
} // namespace art