/*
* Copyright (C) 2011 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 "class.h"
#include "art_field-inl.h"
#include "art_method-inl.h"
#include "class_linker.h"
#include "class_loader.h"
#include "class-inl.h"
#include "dex_cache.h"
#include "dex_file-inl.h"
#include "gc/accounting/card_table-inl.h"
#include "handle_scope-inl.h"
#include "object_array-inl.h"
#include "object-inl.h"
#include "runtime.h"
#include "thread.h"
#include "throwable.h"
#include "utils.h"
#include "well_known_classes.h"
namespace art {
namespace mirror {
GcRoot<Class> Class::java_lang_Class_;
void Class::SetClassClass(Class* java_lang_Class) {
CHECK(java_lang_Class_.IsNull())
<< java_lang_Class_.Read()
<< " " << java_lang_Class;
CHECK(java_lang_Class != nullptr);
java_lang_Class_ = GcRoot<Class>(java_lang_Class);
}
void Class::ResetClass() {
CHECK(!java_lang_Class_.IsNull());
java_lang_Class_ = GcRoot<Class>(nullptr);
}
void Class::VisitRoots(RootCallback* callback, void* arg) {
java_lang_Class_.VisitRootIfNonNull(callback, arg, RootInfo(kRootStickyClass));
}
void Class::SetStatus(Status new_status, Thread* self) {
Status old_status = GetStatus();
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized();
if (LIKELY(class_linker_initialized)) {
if (UNLIKELY(new_status <= old_status && new_status != kStatusError &&
new_status != kStatusRetired)) {
LOG(FATAL) << "Unexpected change back of class status for " << PrettyClass(this) << " "
<< old_status << " -> " << new_status;
}
if (new_status >= kStatusResolved || old_status >= kStatusResolved) {
// When classes are being resolved the resolution code should hold the lock.
CHECK_EQ(GetLockOwnerThreadId(), self->GetThreadId())
<< "Attempt to change status of class while not holding its lock: "
<< PrettyClass(this) << " " << old_status << " -> " << new_status;
}
}
if (UNLIKELY(new_status == kStatusError)) {
CHECK_NE(GetStatus(), kStatusError)
<< "Attempt to set as erroneous an already erroneous class " << PrettyClass(this);
// Stash current exception.
StackHandleScope<3> hs(self);
ThrowLocation old_throw_location;
Handle<mirror::Throwable> old_exception(hs.NewHandle(self->GetException(&old_throw_location)));
CHECK(old_exception.Get() != nullptr);
Handle<mirror::Object> old_throw_this_object(hs.NewHandle(old_throw_location.GetThis()));
Handle<mirror::ArtMethod> old_throw_method(hs.NewHandle(old_throw_location.GetMethod()));
uint32_t old_throw_dex_pc = old_throw_location.GetDexPc();
bool is_exception_reported = self->IsExceptionReportedToInstrumentation();
Class* eiie_class;
// Do't attempt to use FindClass if we have an OOM error since this can try to do more
// allocations and may cause infinite loops.
bool throw_eiie = (old_exception.Get() == nullptr);
if (!throw_eiie) {
std::string temp;
const char* old_exception_descriptor = old_exception->GetClass()->GetDescriptor(&temp);
throw_eiie = (strcmp(old_exception_descriptor, "Ljava/lang/OutOfMemoryError;") != 0);
}
if (throw_eiie) {
// Clear exception to call FindSystemClass.
self->ClearException();
eiie_class = Runtime::Current()->GetClassLinker()->FindSystemClass(
self, "Ljava/lang/ExceptionInInitializerError;");
CHECK(!self->IsExceptionPending());
// Only verification errors, not initialization problems, should set a verify error.
// This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that
// case.
Class* exception_class = old_exception->GetClass();
if (!eiie_class->IsAssignableFrom(exception_class)) {
SetVerifyErrorClass(exception_class);
}
}
// Restore exception.
ThrowLocation gc_safe_throw_location(old_throw_this_object.Get(), old_throw_method.Get(),
old_throw_dex_pc);
self->SetException(gc_safe_throw_location, old_exception.Get());
self->SetExceptionReportedToInstrumentation(is_exception_reported);
}
COMPILE_ASSERT(sizeof(Status) == sizeof(uint32_t), size_of_status_not_uint32);
if (Runtime::Current()->IsActiveTransaction()) {
SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status);
} else {
SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status);
}
if (!class_linker_initialized) {
// When the class linker is being initialized its single threaded and by definition there can be
// no waiters. During initialization classes may appear temporary but won't be retired as their
// size was statically computed.
} else {
// Classes that are being resolved or initialized need to notify waiters that the class status
// changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass.
if (IsTemp()) {
// Class is a temporary one, ensure that waiters for resolution get notified of retirement
// so that they can grab the new version of the class from the class linker's table.
CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(this);
if (new_status == kStatusRetired || new_status == kStatusError) {
NotifyAll(self);
}
} else {
CHECK_NE(new_status, kStatusRetired);
if (old_status >= kStatusResolved || new_status >= kStatusResolved) {
NotifyAll(self);
}
}
}
}
void Class::SetDexCache(DexCache* new_dex_cache) {
SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache);
SetDexCacheStrings(new_dex_cache != nullptr ? new_dex_cache->GetStrings() : nullptr);
}
void Class::SetClassSize(uint32_t new_class_size) {
if (kIsDebugBuild && (new_class_size < GetClassSize())) {
DumpClass(LOG(ERROR), kDumpClassFullDetail);
CHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this);
}
// Not called within a transaction.
SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size);
}
// Return the class' name. The exact format is bizarre, but it's the specified behavior for
// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int"
// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than
// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness.
String* Class::ComputeName(Handle<Class> h_this) {
String* name = h_this->GetName();
if (name != nullptr) {
return name;
}
std::string temp;
const char* descriptor = h_this->GetDescriptor(&temp);
Thread* self = Thread::Current();
if ((descriptor[0] != 'L') && (descriptor[0] != '[')) {
// The descriptor indicates that this is the class for
// a primitive type; special-case the return value.
const char* c_name = nullptr;
switch (descriptor[0]) {
case 'Z': c_name = "boolean"; break;
case 'B': c_name = "byte"; break;
case 'C': c_name = "char"; break;
case 'S': c_name = "short"; break;
case 'I': c_name = "int"; break;
case 'J': c_name = "long"; break;
case 'F': c_name = "float"; break;
case 'D': c_name = "double"; break;
case 'V': c_name = "void"; break;
default:
LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]);
}
name = String::AllocFromModifiedUtf8(self, c_name);
} else {
// Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package
// components.
name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str());
}
h_this->SetName(name);
return name;
}
void Class::DumpClass(std::ostream& os, int flags) {
if ((flags & kDumpClassFullDetail) == 0) {
os << PrettyClass(this);
if ((flags & kDumpClassClassLoader) != 0) {
os << ' ' << GetClassLoader();
}
if ((flags & kDumpClassInitialized) != 0) {
os << ' ' << GetStatus();
}
os << "\n";
return;
}
Thread* self = Thread::Current();
StackHandleScope<2> hs(self);
Handle<mirror::Class> h_this(hs.NewHandle(this));
Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass()));
std::string temp;
os << "----- " << (IsInterface() ? "interface" : "class") << " "
<< "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n",
os << " objectSize=" << SizeOf() << " "
<< "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n",
os << StringPrintf(" access=0x%04x.%04x\n",
GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask);
if (h_super.Get() != nullptr) {
os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader()
<< ")\n";
}
if (IsArrayClass()) {
os << " componentType=" << PrettyClass(GetComponentType()) << "\n";
}
const size_t num_direct_interfaces = NumDirectInterfaces();
if (num_direct_interfaces > 0) {
os << " interfaces (" << num_direct_interfaces << "):\n";
for (size_t i = 0; i < num_direct_interfaces; ++i) {
Class* interface = GetDirectInterface(self, h_this, i);
const ClassLoader* cl = interface->GetClassLoader();
os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl);
}
}
if (!IsLoaded()) {
os << " class not yet loaded";
} else {
// After this point, this may have moved due to GetDirectInterface.
os << " vtable (" << h_this->NumVirtualMethods() << " entries, "
<< (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n";
for (size_t i = 0; i < NumVirtualMethods(); ++i) {
os << StringPrintf(" %2zd: %s\n", i,
PrettyMethod(h_this->GetVirtualMethodDuringLinking(i)).c_str());
}
os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n";
for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) {
os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(h_this->GetDirectMethod(i)).c_str());
}
if (h_this->NumStaticFields() > 0) {
os << " static fields (" << h_this->NumStaticFields() << " entries):\n";
if (h_this->IsResolved() || h_this->IsErroneous()) {
for (size_t i = 0; i < h_this->NumStaticFields(); ++i) {
os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str());
}
} else {
os << " <not yet available>";
}
}
if (h_this->NumInstanceFields() > 0) {
os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n";
if (h_this->IsResolved() || h_this->IsErroneous()) {
for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) {
os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str());
}
} else {
os << " <not yet available>";
}
}
}
}
void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) {
if (new_reference_offsets != CLASS_WALK_SUPER) {
// Sanity check that the number of bits set in the reference offset bitmap
// agrees with the number of references
size_t count = 0;
for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
count += c->NumReferenceInstanceFieldsDuringLinking();
}
CHECK_EQ((size_t)POPCOUNT(new_reference_offsets), count);
}
// Not called within a transaction.
SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_),
new_reference_offsets);
}
void Class::SetReferenceStaticOffsets(uint32_t new_reference_offsets) {
if (new_reference_offsets != CLASS_WALK_SUPER) {
// Sanity check that the number of bits set in the reference offset bitmap
// agrees with the number of references
CHECK_EQ((size_t)POPCOUNT(new_reference_offsets),
NumReferenceStaticFieldsDuringLinking());
}
// Not called within a transaction.
SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_static_offsets_),
new_reference_offsets);
}
bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) {
size_t i = 0;
while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) {
++i;
}
if (descriptor1.find('/', i) != StringPiece::npos ||
descriptor2.find('/', i) != StringPiece::npos) {
return false;
} else {
return true;
}
}
bool Class::IsInSamePackage(Class* that) {
Class* klass1 = this;
Class* klass2 = that;
if (klass1 == klass2) {
return true;
}
// Class loaders must match.
if (klass1->GetClassLoader() != klass2->GetClassLoader()) {
return false;
}
// Arrays are in the same package when their element classes are.
while (klass1->IsArrayClass()) {
klass1 = klass1->GetComponentType();
}
while (klass2->IsArrayClass()) {
klass2 = klass2->GetComponentType();
}
// trivial check again for array types
if (klass1 == klass2) {
return true;
}
// Compare the package part of the descriptor string.
std::string temp1, temp2;
return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2));
}
bool Class::IsStringClass() const {
return this == String::GetJavaLangString();
}
bool Class::IsThrowableClass() {
return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this);
}
void Class::SetClassLoader(ClassLoader* new_class_loader) {
if (Runtime::Current()->IsActiveTransaction()) {
SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader);
} else {
SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader);
}
}
ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) {
// Check the current class before checking the interfaces.
ArtMethod* method = FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
int32_t iftable_count = GetIfTableCount();
IfTable* iftable = GetIfTable();
for (int32_t i = 0; i < iftable_count; ++i) {
method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature) {
// Check the current class before checking the interfaces.
ArtMethod* method = FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
int32_t iftable_count = GetIfTableCount();
IfTable* iftable = GetIfTable();
for (int32_t i = 0; i < iftable_count; ++i) {
method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) {
// Check the current class before checking the interfaces.
ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
if (method != nullptr) {
return method;
}
int32_t iftable_count = GetIfTableCount();
IfTable* iftable = GetIfTable();
for (int32_t i = 0; i < iftable_count; ++i) {
method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) {
for (size_t i = 0; i < NumDirectMethods(); ++i) {
ArtMethod* method = GetDirectMethod(i);
if (name == method->GetName() && method->GetSignature() == signature) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature) {
for (size_t i = 0; i < NumDirectMethods(); ++i) {
ArtMethod* method = GetDirectMethod(i);
if (name == method->GetName() && signature == method->GetSignature()) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) {
if (GetDexCache() == dex_cache) {
for (size_t i = 0; i < NumDirectMethods(); ++i) {
ArtMethod* method = GetDirectMethod(i);
if (method->GetDexMethodIndex() == dex_method_idx) {
return method;
}
}
}
return nullptr;
}
ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature) {
for (size_t i = 0; i < NumVirtualMethods(); ++i) {
ArtMethod* method = GetVirtualMethod(i);
if (name == method->GetName() && method->GetSignature() == signature) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature) {
for (size_t i = 0; i < NumVirtualMethods(); ++i) {
ArtMethod* method = GetVirtualMethod(i);
if (name == method->GetName() && signature == method->GetSignature()) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) {
if (GetDexCache() == dex_cache) {
for (size_t i = 0; i < NumVirtualMethods(); ++i) {
ArtMethod* method = GetVirtualMethod(i);
if (method->GetDexMethodIndex() == dex_method_idx &&
// A miranda method may have a different DexCache and is always created by linking,
// never *declared* in the class.
!method->IsMiranda()) {
return method;
}
}
}
return nullptr;
}
ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) {
for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) {
ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx);
if (method != nullptr) {
return method;
}
}
return nullptr;
}
ArtMethod* Class::FindClassInitializer() {
for (size_t i = 0; i < NumDirectMethods(); ++i) {
ArtMethod* method = GetDirectMethod(i);
if (method->IsClassInitializer()) {
DCHECK_STREQ(method->GetName(), "<clinit>");
DCHECK_STREQ(method->GetSignature().ToString().c_str(), "()V");
return method;
}
}
return nullptr;
}
ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) {
// Is the field in this class?
// Interfaces are not relevant because they can't contain instance fields.
for (size_t i = 0; i < NumInstanceFields(); ++i) {
ArtField* f = GetInstanceField(i);
if (name == f->GetName() && type == f->GetTypeDescriptor()) {
return f;
}
}
return nullptr;
}
ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
if (GetDexCache() == dex_cache) {
for (size_t i = 0; i < NumInstanceFields(); ++i) {
ArtField* f = GetInstanceField(i);
if (f->GetDexFieldIndex() == dex_field_idx) {
return f;
}
}
}
return nullptr;
}
ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) {
// Is the field in this class, or any of its superclasses?
// Interfaces are not relevant because they can't contain instance fields.
for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
ArtField* f = c->FindDeclaredInstanceField(name, type);
if (f != nullptr) {
return f;
}
}
return nullptr;
}
ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) {
// Is the field in this class, or any of its superclasses?
// Interfaces are not relevant because they can't contain instance fields.
for (Class* c = this; c != nullptr; c = c->GetSuperClass()) {
ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx);
if (f != nullptr) {
return f;
}
}
return nullptr;
}
ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) {
DCHECK(type != nullptr);
for (size_t i = 0; i < NumStaticFields(); ++i) {
ArtField* f = GetStaticField(i);
if (name == f->GetName() && type == f->GetTypeDescriptor()) {
return f;
}
}
return nullptr;
}
ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) {
if (dex_cache == GetDexCache()) {
for (size_t i = 0; i < NumStaticFields(); ++i) {
ArtField* f = GetStaticField(i);
if (f->GetDexFieldIndex() == dex_field_idx) {
return f;
}
}
}
return nullptr;
}
ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name,
const StringPiece& type) {
// Is the field in this class (or its interfaces), or any of its
// superclasses (or their interfaces)?
for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
// Is the field in this class?
ArtField* f = k->FindDeclaredStaticField(name, type);
if (f != nullptr) {
return f;
}
// Wrap k incase it moves during GetDirectInterface.
StackHandleScope<1> hs(self);
HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
// Is this field in any of this class' interfaces?
for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
StackHandleScope<1> hs(self);
Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i)));
f = FindStaticField(self, interface, name, type);
if (f != nullptr) {
return f;
}
}
}
return nullptr;
}
ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache,
uint32_t dex_field_idx) {
for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
// Is the field in this class?
ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx);
if (f != nullptr) {
return f;
}
// Wrap k incase it moves during GetDirectInterface.
StackHandleScope<1> hs(self);
HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
// Is this field in any of this class' interfaces?
for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
StackHandleScope<1> hs(self);
Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i)));
f = FindStaticField(self, interface, dex_cache, dex_field_idx);
if (f != nullptr) {
return f;
}
}
}
return nullptr;
}
ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name,
const StringPiece& type) {
// Find a field using the JLS field resolution order
for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) {
// Is the field in this class?
ArtField* f = k->FindDeclaredInstanceField(name, type);
if (f != nullptr) {
return f;
}
f = k->FindDeclaredStaticField(name, type);
if (f != nullptr) {
return f;
}
// Is this field in any of this class' interfaces?
StackHandleScope<1> hs(self);
HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k));
for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) {
StackHandleScope<1> hs(self);
Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i)));
f = interface->FindStaticField(self, interface, name, type);
if (f != nullptr) {
return f;
}
}
}
return nullptr;
}
static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (methods != nullptr) {
for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) {
mirror::ArtMethod* method = methods->GetWithoutChecks(index);
DCHECK(method != nullptr);
if (!method->IsNative() && !method->IsAbstract()) {
method->SetPreverified();
}
}
}
}
void Class::SetPreverifiedFlagOnAllMethods() {
DCHECK(IsVerified());
SetPreverifiedFlagOnMethods(GetDirectMethods());
SetPreverifiedFlagOnMethods(GetVirtualMethods());
}
const char* Class::GetDescriptor(std::string* storage) {
if (IsPrimitive()) {
return Primitive::Descriptor(GetPrimitiveType());
} else if (IsArrayClass()) {
return GetArrayDescriptor(storage);
} else if (IsProxyClass()) {
*storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this);
return storage->c_str();
} else {
const DexFile& dex_file = GetDexFile();
const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_);
return dex_file.GetTypeDescriptor(type_id);
}
}
const char* Class::GetArrayDescriptor(std::string* storage) {
std::string temp;
const char* elem_desc = GetComponentType()->GetDescriptor(&temp);
*storage = "[";
*storage += elem_desc;
return storage->c_str();
}
const DexFile::ClassDef* Class::GetClassDef() {
uint16_t class_def_idx = GetDexClassDefIndex();
if (class_def_idx == DexFile::kDexNoIndex16) {
return nullptr;
}
return &GetDexFile().GetClassDef(class_def_idx);
}
uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) {
DCHECK(!IsPrimitive());
DCHECK(!IsArrayClass());
return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_;
}
mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, uint32_t idx) {
DCHECK(klass.Get() != nullptr);
DCHECK(!klass->IsPrimitive());
if (klass->IsArrayClass()) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
if (idx == 0) {
return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;");
} else {
DCHECK_EQ(1U, idx);
return class_linker->FindSystemClass(self, "Ljava/io/Serializable;");
}
} else if (klass->IsProxyClass()) {
mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces();
DCHECK(interfaces != nullptr);
return interfaces->Get(idx);
} else {
uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx);
mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx);
if (interface == nullptr) {
interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx,
klass.Get());
CHECK(interface != nullptr || self->IsExceptionPending());
}
return interface;
}
}
const char* Class::GetSourceFile() {
const DexFile& dex_file = GetDexFile();
const DexFile::ClassDef* dex_class_def = GetClassDef();
if (dex_class_def == nullptr) {
// Generated classes have no class def.
return nullptr;
}
return dex_file.GetSourceFile(*dex_class_def);
}
std::string Class::GetLocation() {
mirror::DexCache* dex_cache = GetDexCache();
if (dex_cache != nullptr && !IsProxyClass()) {
return dex_cache->GetLocation()->ToModifiedUtf8();
}
// Arrays and proxies are generated and have no corresponding dex file location.
return "generated class";
}
const DexFile::TypeList* Class::GetInterfaceTypeList() {
const DexFile::ClassDef* class_def = GetClassDef();
if (class_def == nullptr) {
return nullptr;
}
return GetDexFile().GetInterfacesList(*class_def);
}
void Class::PopulateEmbeddedImtAndVTable(StackHandleScope<kImtSize>* imt_handle_scope) {
for (uint32_t i = 0; i < kImtSize; i++) {
// Replace null with conflict.
mirror::Object* obj = imt_handle_scope->GetReference(i);
DCHECK(obj != nullptr);
SetEmbeddedImTableEntry(i, obj->AsArtMethod());
}
ObjectArray<ArtMethod>* table = GetVTableDuringLinking();
CHECK(table != nullptr) << PrettyClass(this);
SetEmbeddedVTableLength(table->GetLength());
for (int32_t i = 0; i < table->GetLength(); i++) {
SetEmbeddedVTableEntry(i, table->GetWithoutChecks(i));
}
// Keep java.lang.Object class's vtable around for since it's easier
// to be reused by array classes during their linking.
if (!IsObjectClass()) {
SetVTable(nullptr);
}
}
// The pre-fence visitor for Class::CopyOf().
class CopyClassVisitor {
public:
explicit CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig,
size_t new_length, size_t copy_bytes,
StackHandleScope<mirror::Class::kImtSize>* imt_handle_scope)
: self_(self), orig_(orig), new_length_(new_length),
copy_bytes_(copy_bytes), imt_handle_scope_(imt_handle_scope) {
}
void operator()(Object* obj, size_t usable_size) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
UNUSED(usable_size);
mirror::Class* new_class_obj = obj->AsClass();
mirror::Object::CopyObject(self_, new_class_obj, orig_->Get(), copy_bytes_);
new_class_obj->SetStatus(Class::kStatusResolving, self_);
new_class_obj->PopulateEmbeddedImtAndVTable(imt_handle_scope_);
new_class_obj->SetClassSize(new_length_);
}
private:
Thread* const self_;
Handle<mirror::Class>* const orig_;
const size_t new_length_;
const size_t copy_bytes_;
StackHandleScope<mirror::Class::kImtSize>* const imt_handle_scope_;
DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor);
};
Class* Class::CopyOf(Thread* self, int32_t new_length,
StackHandleScope<kImtSize>* imt_handle_scope) {
DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class)));
// We may get copied by a compacting GC.
StackHandleScope<1> hs(self);
Handle<mirror::Class> h_this(hs.NewHandle(this));
gc::Heap* heap = Runtime::Current()->GetHeap();
// The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf()
// to skip copying the tail part that we will overwrite here.
CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt_handle_scope);
mirror::Object* new_class =
kMovingClasses
? heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor)
: heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor);
if (UNLIKELY(new_class == nullptr)) {
CHECK(self->IsExceptionPending()); // Expect an OOME.
return nullptr;
}
return new_class->AsClass();
}
} // namespace mirror
} // namespace art