blob: f07282040ce9c9bee19bca49b82003f2e9bc7f43 [file] [log] [blame]
/*
* 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_linker.h"
#include <fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <deque>
#include <string>
#include <utility>
#include <vector>
#include "base/casts.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/unix_file/fd_file.h"
#include "class_linker-inl.h"
#include "debugger.h"
#include "dex_file-inl.h"
#include "gc/accounting/card_table-inl.h"
#include "gc/accounting/heap_bitmap.h"
#include "gc/heap.h"
#include "gc/space/image_space.h"
#include "intern_table.h"
#include "interpreter/interpreter.h"
#include "leb128.h"
#include "oat.h"
#include "oat_file.h"
#include "mirror/art_field-inl.h"
#include "mirror/art_method-inl.h"
#include "mirror/class.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/dex_cache-inl.h"
#include "mirror/iftable-inl.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-inl.h"
#include "mirror/proxy.h"
#include "mirror/stack_trace_element.h"
#include "object_utils.h"
#include "os.h"
#include "runtime.h"
#include "entrypoints/entrypoint_utils.h"
#include "ScopedLocalRef.h"
#include "scoped_thread_state_change.h"
#include "sirt_ref.h"
#include "stack_indirect_reference_table.h"
#include "thread.h"
#include "UniquePtr.h"
#include "utils.h"
#include "verifier/method_verifier.h"
#include "well_known_classes.h"
namespace art {
static void ThrowNoClassDefFoundError(const char* fmt, ...)
__attribute__((__format__(__printf__, 1, 2)))
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static void ThrowNoClassDefFoundError(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
Thread* self = Thread::Current();
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
self->ThrowNewExceptionV(throw_location, "Ljava/lang/NoClassDefFoundError;", fmt, args);
va_end(args);
}
static void ThrowEarlierClassFailure(mirror::Class* c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// The class failed to initialize on a previous attempt, so we want to throw
// a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we
// failed in verification, in which case v2 5.4.1 says we need to re-throw
// the previous error.
if (!Runtime::Current()->IsCompiler()) { // Give info if this occurs at runtime.
LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c);
}
CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus();
Thread* self = Thread::Current();
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
if (c->GetVerifyErrorClass() != NULL) {
// TODO: change the verifier to store an _instance_, with a useful detail message?
ClassHelper ve_ch(c->GetVerifyErrorClass());
self->ThrowNewException(throw_location, ve_ch.GetDescriptor(), PrettyDescriptor(c).c_str());
} else {
self->ThrowNewException(throw_location, "Ljava/lang/NoClassDefFoundError;",
PrettyDescriptor(c).c_str());
}
}
static void WrapExceptionInInitializer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Thread* self = Thread::Current();
JNIEnv* env = self->GetJniEnv();
ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred());
CHECK(cause.get() != NULL);
env->ExceptionClear();
bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error);
env->Throw(cause.get());
// We only wrap non-Error exceptions; an Error can just be used as-is.
if (!is_error) {
ThrowLocation throw_location = self->GetCurrentLocationForThrow();
self->ThrowNewWrappedException(throw_location, "Ljava/lang/ExceptionInInitializerError;", NULL);
}
}
static size_t Hash(const char* s) {
// This is the java.lang.String hashcode for convenience, not interoperability.
size_t hash = 0;
for (; *s != '\0'; ++s) {
hash = hash * 31 + *s;
}
return hash;
}
const char* ClassLinker::class_roots_descriptors_[] = {
"Ljava/lang/Class;",
"Ljava/lang/Object;",
"[Ljava/lang/Class;",
"[Ljava/lang/Object;",
"Ljava/lang/String;",
"Ljava/lang/DexCache;",
"Ljava/lang/ref/Reference;",
"Ljava/lang/reflect/ArtField;",
"Ljava/lang/reflect/ArtMethod;",
"Ljava/lang/reflect/Proxy;",
"[Ljava/lang/String;",
"[Ljava/lang/reflect/ArtField;",
"[Ljava/lang/reflect/ArtMethod;",
"Ljava/lang/ClassLoader;",
"Ljava/lang/Throwable;",
"Ljava/lang/ClassNotFoundException;",
"Ljava/lang/StackTraceElement;",
"Z",
"B",
"C",
"D",
"F",
"I",
"J",
"S",
"V",
"[Z",
"[B",
"[C",
"[D",
"[F",
"[I",
"[J",
"[S",
"[Ljava/lang/StackTraceElement;",
};
ClassLinker* ClassLinker::CreateFromCompiler(const std::vector<const DexFile*>& boot_class_path,
InternTable* intern_table) {
CHECK_NE(boot_class_path.size(), 0U);
UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table));
class_linker->InitFromCompiler(boot_class_path);
return class_linker.release();
}
ClassLinker* ClassLinker::CreateFromImage(InternTable* intern_table) {
UniquePtr<ClassLinker> class_linker(new ClassLinker(intern_table));
class_linker->InitFromImage();
return class_linker.release();
}
ClassLinker::ClassLinker(InternTable* intern_table)
// dex_lock_ is recursive as it may be used in stack dumping.
: dex_lock_("ClassLinker dex lock", kDefaultMutexLevel),
dex_cache_image_class_lookup_required_(false),
failed_dex_cache_class_lookups_(0),
class_roots_(NULL),
array_iftable_(NULL),
init_done_(false),
dex_caches_dirty_(false),
class_table_dirty_(false),
intern_table_(intern_table),
portable_resolution_trampoline_(NULL),
quick_resolution_trampoline_(NULL) {
CHECK_EQ(arraysize(class_roots_descriptors_), size_t(kClassRootsMax));
}
void ClassLinker::InitFromCompiler(const std::vector<const DexFile*>& boot_class_path) {
VLOG(startup) << "ClassLinker::Init";
CHECK(Runtime::Current()->IsCompiler());
CHECK(!init_done_);
// java_lang_Class comes first, it's needed for AllocClass
Thread* self = Thread::Current();
gc::Heap* heap = Runtime::Current()->GetHeap();
SirtRef<mirror::Class>
java_lang_Class(self,
down_cast<mirror::Class*>(heap->AllocObject(self, NULL,
sizeof(mirror::ClassClass))));
CHECK(java_lang_Class.get() != NULL);
mirror::Class::SetClassClass(java_lang_Class.get());
java_lang_Class->SetClass(java_lang_Class.get());
java_lang_Class->SetClassSize(sizeof(mirror::ClassClass));
// AllocClass(mirror::Class*) can now be used
// Class[] is used for reflection support.
SirtRef<mirror::Class> class_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
class_array_class->SetComponentType(java_lang_Class.get());
// java_lang_Object comes next so that object_array_class can be created.
SirtRef<mirror::Class> java_lang_Object(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
CHECK(java_lang_Object.get() != NULL);
// backfill Object as the super class of Class.
java_lang_Class->SetSuperClass(java_lang_Object.get());
java_lang_Object->SetStatus(mirror::Class::kStatusLoaded, self);
// Object[] next to hold class roots.
SirtRef<mirror::Class> object_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
object_array_class->SetComponentType(java_lang_Object.get());
// Setup the char class to be used for char[].
SirtRef<mirror::Class> char_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
// Setup the char[] class to be used for String.
SirtRef<mirror::Class> char_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
char_array_class->SetComponentType(char_class.get());
mirror::CharArray::SetArrayClass(char_array_class.get());
// Setup String.
SirtRef<mirror::Class> java_lang_String(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::StringClass)));
mirror::String::SetClass(java_lang_String.get());
java_lang_String->SetObjectSize(sizeof(mirror::String));
java_lang_String->SetStatus(mirror::Class::kStatusResolved, self);
// Create storage for root classes, save away our work so far (requires descriptors).
class_roots_ = mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.get(), kClassRootsMax);
CHECK(class_roots_ != NULL);
SetClassRoot(kJavaLangClass, java_lang_Class.get());
SetClassRoot(kJavaLangObject, java_lang_Object.get());
SetClassRoot(kClassArrayClass, class_array_class.get());
SetClassRoot(kObjectArrayClass, object_array_class.get());
SetClassRoot(kCharArrayClass, char_array_class.get());
SetClassRoot(kJavaLangString, java_lang_String.get());
// Setup the primitive type classes.
SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean));
SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte));
SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort));
SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt));
SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong));
SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat));
SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble));
SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid));
// Create array interface entries to populate once we can load system classes.
array_iftable_ = AllocIfTable(self, 2);
// Create int array type for AllocDexCache (done in AppendToBootClassPath).
SirtRef<mirror::Class> int_array_class(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::Class)));
int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt));
mirror::IntArray::SetArrayClass(int_array_class.get());
SetClassRoot(kIntArrayClass, int_array_class.get());
// now that these are registered, we can use AllocClass() and AllocObjectArray
// Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache.
SirtRef<mirror::Class>
java_lang_DexCache(self, AllocClass(self, java_lang_Class.get(), sizeof(mirror::DexCacheClass)));
SetClassRoot(kJavaLangDexCache, java_lang_DexCache.get());
java_lang_DexCache->SetObjectSize(sizeof(mirror::DexCacheClass));
java_lang_DexCache->SetStatus(mirror::Class::kStatusResolved, self);
// Constructor, Field, Method, and AbstractMethod are necessary so that FindClass can link members.
SirtRef<mirror::Class> java_lang_reflect_ArtField(self, AllocClass(self, java_lang_Class.get(),
sizeof(mirror::ArtFieldClass)));
CHECK(java_lang_reflect_ArtField.get() != NULL);
java_lang_reflect_ArtField->SetObjectSize(sizeof(mirror::ArtField));
SetClassRoot(kJavaLangReflectArtField, java_lang_reflect_ArtField.get());
java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusResolved, self);
mirror::ArtField::SetClass(java_lang_reflect_ArtField.get());
SirtRef<mirror::Class> java_lang_reflect_ArtMethod(self, AllocClass(self, java_lang_Class.get(),
sizeof(mirror::ArtMethodClass)));
CHECK(java_lang_reflect_ArtMethod.get() != NULL);
java_lang_reflect_ArtMethod->SetObjectSize(sizeof(mirror::ArtMethod));
SetClassRoot(kJavaLangReflectArtMethod, java_lang_reflect_ArtMethod.get());
java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusResolved, self);
mirror::ArtMethod::SetClass(java_lang_reflect_ArtMethod.get());
// Set up array classes for string, field, method
SirtRef<mirror::Class> object_array_string(self, AllocClass(self, java_lang_Class.get(),
sizeof(mirror::Class)));
object_array_string->SetComponentType(java_lang_String.get());
SetClassRoot(kJavaLangStringArrayClass, object_array_string.get());
SirtRef<mirror::Class> object_array_art_method(self, AllocClass(self, java_lang_Class.get(),
sizeof(mirror::Class)));
object_array_art_method->SetComponentType(java_lang_reflect_ArtMethod.get());
SetClassRoot(kJavaLangReflectArtMethodArrayClass, object_array_art_method.get());
SirtRef<mirror::Class> object_array_art_field(self, AllocClass(self, java_lang_Class.get(),
sizeof(mirror::Class)));
object_array_art_field->SetComponentType(java_lang_reflect_ArtField.get());
SetClassRoot(kJavaLangReflectArtFieldArrayClass, object_array_art_field.get());
// Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create
// DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses
// these roots.
CHECK_NE(0U, boot_class_path.size());
for (size_t i = 0; i != boot_class_path.size(); ++i) {
const DexFile* dex_file = boot_class_path[i];
CHECK(dex_file != NULL);
AppendToBootClassPath(*dex_file);
}
// now we can use FindSystemClass
// run char class through InitializePrimitiveClass to finish init
InitializePrimitiveClass(char_class.get(), Primitive::kPrimChar);
SetClassRoot(kPrimitiveChar, char_class.get()); // needs descriptor
// Object, String and DexCache need to be rerun through FindSystemClass to finish init
java_lang_Object->SetStatus(mirror::Class::kStatusNotReady, self);
mirror::Class* Object_class = FindSystemClass("Ljava/lang/Object;");
CHECK_EQ(java_lang_Object.get(), Object_class);
CHECK_EQ(java_lang_Object->GetObjectSize(), sizeof(mirror::Object));
java_lang_String->SetStatus(mirror::Class::kStatusNotReady, self);
mirror::Class* String_class = FindSystemClass("Ljava/lang/String;");
CHECK_EQ(java_lang_String.get(), String_class);
CHECK_EQ(java_lang_String->GetObjectSize(), sizeof(mirror::String));
java_lang_DexCache->SetStatus(mirror::Class::kStatusNotReady, self);
mirror::Class* DexCache_class = FindSystemClass("Ljava/lang/DexCache;");
CHECK_EQ(java_lang_String.get(), String_class);
CHECK_EQ(java_lang_DexCache.get(), DexCache_class);
CHECK_EQ(java_lang_DexCache->GetObjectSize(), sizeof(mirror::DexCache));
// Setup the primitive array type classes - can't be done until Object has a vtable.
SetClassRoot(kBooleanArrayClass, FindSystemClass("[Z"));
mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass));
SetClassRoot(kByteArrayClass, FindSystemClass("[B"));
mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass));
mirror::Class* found_char_array_class = FindSystemClass("[C");
CHECK_EQ(char_array_class.get(), found_char_array_class);
SetClassRoot(kShortArrayClass, FindSystemClass("[S"));
mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass));
mirror::Class* found_int_array_class = FindSystemClass("[I");
CHECK_EQ(int_array_class.get(), found_int_array_class);
SetClassRoot(kLongArrayClass, FindSystemClass("[J"));
mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass));
SetClassRoot(kFloatArrayClass, FindSystemClass("[F"));
mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass));
SetClassRoot(kDoubleArrayClass, FindSystemClass("[D"));
mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass));
mirror::Class* found_class_array_class = FindSystemClass("[Ljava/lang/Class;");
CHECK_EQ(class_array_class.get(), found_class_array_class);
mirror::Class* found_object_array_class = FindSystemClass("[Ljava/lang/Object;");
CHECK_EQ(object_array_class.get(), found_object_array_class);
// Setup the single, global copy of "iftable".
mirror::Class* java_lang_Cloneable = FindSystemClass("Ljava/lang/Cloneable;");
CHECK(java_lang_Cloneable != NULL);
mirror::Class* java_io_Serializable = FindSystemClass("Ljava/io/Serializable;");
CHECK(java_io_Serializable != NULL);
// We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to
// crawl up and explicitly list all of the supers as well.
array_iftable_->SetInterface(0, java_lang_Cloneable);
array_iftable_->SetInterface(1, java_io_Serializable);
// Sanity check Class[] and Object[]'s interfaces.
ClassHelper kh(class_array_class.get(), this);
CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0));
CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1));
kh.ChangeClass(object_array_class.get());
CHECK_EQ(java_lang_Cloneable, kh.GetDirectInterface(0));
CHECK_EQ(java_io_Serializable, kh.GetDirectInterface(1));
// Run Class, ArtField, and ArtMethod through FindSystemClass. This initializes their
// dex_cache_ fields and register them in class_table_.
mirror::Class* Class_class = FindSystemClass("Ljava/lang/Class;");
CHECK_EQ(java_lang_Class.get(), Class_class);
java_lang_reflect_ArtMethod->SetStatus(mirror::Class::kStatusNotReady, self);
mirror::Class* Art_method_class = FindSystemClass("Ljava/lang/reflect/ArtMethod;");
CHECK_EQ(java_lang_reflect_ArtMethod.get(), Art_method_class);
java_lang_reflect_ArtField->SetStatus(mirror::Class::kStatusNotReady, self);
mirror::Class* Art_field_class = FindSystemClass("Ljava/lang/reflect/ArtField;");
CHECK_EQ(java_lang_reflect_ArtField.get(), Art_field_class);
mirror::Class* String_array_class = FindSystemClass(class_roots_descriptors_[kJavaLangStringArrayClass]);
CHECK_EQ(object_array_string.get(), String_array_class);
mirror::Class* Art_method_array_class =
FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]);
CHECK_EQ(object_array_art_method.get(), Art_method_array_class);
mirror::Class* Art_field_array_class =
FindSystemClass(class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]);
CHECK_EQ(object_array_art_field.get(), Art_field_array_class);
// End of special init trickery, subsequent classes may be loaded via FindSystemClass.
// Create java.lang.reflect.Proxy root.
mirror::Class* java_lang_reflect_Proxy = FindSystemClass("Ljava/lang/reflect/Proxy;");
SetClassRoot(kJavaLangReflectProxy, java_lang_reflect_Proxy);
// java.lang.ref classes need to be specially flagged, but otherwise are normal classes
mirror::Class* java_lang_ref_Reference = FindSystemClass("Ljava/lang/ref/Reference;");
SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference);
mirror::Class* java_lang_ref_FinalizerReference = FindSystemClass("Ljava/lang/ref/FinalizerReference;");
java_lang_ref_FinalizerReference->SetAccessFlags(
java_lang_ref_FinalizerReference->GetAccessFlags() |
kAccClassIsReference | kAccClassIsFinalizerReference);
mirror::Class* java_lang_ref_PhantomReference = FindSystemClass("Ljava/lang/ref/PhantomReference;");
java_lang_ref_PhantomReference->SetAccessFlags(
java_lang_ref_PhantomReference->GetAccessFlags() |
kAccClassIsReference | kAccClassIsPhantomReference);
mirror::Class* java_lang_ref_SoftReference = FindSystemClass("Ljava/lang/ref/SoftReference;");
java_lang_ref_SoftReference->SetAccessFlags(
java_lang_ref_SoftReference->GetAccessFlags() | kAccClassIsReference);
mirror::Class* java_lang_ref_WeakReference = FindSystemClass("Ljava/lang/ref/WeakReference;");
java_lang_ref_WeakReference->SetAccessFlags(
java_lang_ref_WeakReference->GetAccessFlags() |
kAccClassIsReference | kAccClassIsWeakReference);
// Setup the ClassLoader, verifying the object_size_.
mirror::Class* java_lang_ClassLoader = FindSystemClass("Ljava/lang/ClassLoader;");
CHECK_EQ(java_lang_ClassLoader->GetObjectSize(), sizeof(mirror::ClassLoader));
SetClassRoot(kJavaLangClassLoader, java_lang_ClassLoader);
// Set up java.lang.Throwable, java.lang.ClassNotFoundException, and
// java.lang.StackTraceElement as a convenience.
SetClassRoot(kJavaLangThrowable, FindSystemClass("Ljava/lang/Throwable;"));
mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable));
SetClassRoot(kJavaLangClassNotFoundException, FindSystemClass("Ljava/lang/ClassNotFoundException;"));
SetClassRoot(kJavaLangStackTraceElement, FindSystemClass("Ljava/lang/StackTraceElement;"));
SetClassRoot(kJavaLangStackTraceElementArrayClass, FindSystemClass("[Ljava/lang/StackTraceElement;"));
mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement));
FinishInit();
VLOG(startup) << "ClassLinker::InitFromCompiler exiting";
}
void ClassLinker::FinishInit() {
VLOG(startup) << "ClassLinker::FinishInit entering";
// Let the heap know some key offsets into java.lang.ref instances
// Note: we hard code the field indexes here rather than using FindInstanceField
// as the types of the field can't be resolved prior to the runtime being
// fully initialized
mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference);
mirror::Class* java_lang_ref_FinalizerReference =
FindSystemClass("Ljava/lang/ref/FinalizerReference;");
mirror::ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0);
FieldHelper fh(pendingNext, this);
CHECK_STREQ(fh.GetName(), "pendingNext");
CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;");
mirror::ArtField* queue = java_lang_ref_Reference->GetInstanceField(1);
fh.ChangeField(queue);
CHECK_STREQ(fh.GetName(), "queue");
CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;");
mirror::ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2);
fh.ChangeField(queueNext);
CHECK_STREQ(fh.GetName(), "queueNext");
CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/ref/Reference;");
mirror::ArtField* referent = java_lang_ref_Reference->GetInstanceField(3);
fh.ChangeField(referent);
CHECK_STREQ(fh.GetName(), "referent");
CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;");
mirror::ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2);
fh.ChangeField(zombie);
CHECK_STREQ(fh.GetName(), "zombie");
CHECK_STREQ(fh.GetTypeDescriptor(), "Ljava/lang/Object;");
gc::Heap* heap = Runtime::Current()->GetHeap();
heap->SetReferenceOffsets(referent->GetOffset(),
queue->GetOffset(),
queueNext->GetOffset(),
pendingNext->GetOffset(),
zombie->GetOffset());
// ensure all class_roots_ are initialized
for (size_t i = 0; i < kClassRootsMax; i++) {
ClassRoot class_root = static_cast<ClassRoot>(i);
mirror::Class* klass = GetClassRoot(class_root);
CHECK(klass != NULL);
DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != NULL);
// note SetClassRoot does additional validation.
// if possible add new checks there to catch errors early
}
CHECK(array_iftable_ != NULL);
// disable the slow paths in FindClass and CreatePrimitiveClass now
// that Object, Class, and Object[] are setup
init_done_ = true;
VLOG(startup) << "ClassLinker::FinishInit exiting";
}
void ClassLinker::RunRootClinits() {
Thread* self = Thread::Current();
for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) {
mirror::Class* c = GetClassRoot(ClassRoot(i));
if (!c->IsArrayClass() && !c->IsPrimitive()) {
EnsureInitialized(GetClassRoot(ClassRoot(i)), true, true);
self->AssertNoPendingException();
}
}
}
bool ClassLinker::GenerateOatFile(const std::string& dex_filename,
int oat_fd,
const std::string& oat_cache_filename) {
std::string dex2oat_string(GetAndroidRoot());
dex2oat_string += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat");
const char* dex2oat = dex2oat_string.c_str();
const char* class_path = Runtime::Current()->GetClassPathString().c_str();
gc::Heap* heap = Runtime::Current()->GetHeap();
std::string boot_image_option_string("--boot-image=");
boot_image_option_string += heap->GetImageSpace()->GetImageFilename();
const char* boot_image_option = boot_image_option_string.c_str();
std::string dex_file_option_string("--dex-file=");
dex_file_option_string += dex_filename;
const char* dex_file_option = dex_file_option_string.c_str();
std::string oat_fd_option_string("--oat-fd=");
StringAppendF(&oat_fd_option_string, "%d", oat_fd);
const char* oat_fd_option = oat_fd_option_string.c_str();
std::string oat_location_option_string("--oat-location=");
oat_location_option_string += oat_cache_filename;
const char* oat_location_option = oat_location_option_string.c_str();
std::string oat_compiler_filter_string("-compiler-filter:");
switch (Runtime::Current()->GetCompilerFilter()) {
case Runtime::kInterpretOnly:
oat_compiler_filter_string += "interpret-only";
break;
case Runtime::kSpace:
oat_compiler_filter_string += "space";
break;
case Runtime::kBalanced:
oat_compiler_filter_string += "balanced";
break;
case Runtime::kSpeed:
oat_compiler_filter_string += "speed";
break;
case Runtime::kEverything:
oat_compiler_filter_string += "everything";
break;
default:
LOG(FATAL) << "Unexpected case.";
}
const char* oat_compiler_filter_option = oat_compiler_filter_string.c_str();
// fork and exec dex2oat
pid_t pid = fork();
if (pid == 0) {
// no allocation allowed between fork and exec
// change process groups, so we don't get reaped by ProcessManager
setpgid(0, 0);
// gLogVerbosity.class_linker = true;
VLOG(class_linker) << dex2oat
<< " --runtime-arg -Xms64m"
<< " --runtime-arg -Xmx64m"
<< " --runtime-arg -classpath"
<< " --runtime-arg " << class_path
<< " --runtime-arg " << oat_compiler_filter_option
#if !defined(ART_TARGET)
<< " --host"
#endif
<< " " << boot_image_option
<< " " << dex_file_option
<< " " << oat_fd_option
<< " " << oat_location_option;
execl(dex2oat, dex2oat,
"--runtime-arg", "-Xms64m",
"--runtime-arg", "-Xmx64m",
"--runtime-arg", "-classpath",
"--runtime-arg", class_path,
"--runtime-arg", oat_compiler_filter_option,
#if !defined(ART_TARGET)
"--host",
#endif
boot_image_option,
dex_file_option,
oat_fd_option,
oat_location_option,
NULL);
PLOG(FATAL) << "execl(" << dex2oat << ") failed";
return false;
} else {
// wait for dex2oat to finish
int status;
pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
if (got_pid != pid) {
PLOG(ERROR) << "waitpid failed: wanted " << pid << ", got " << got_pid;
return false;
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOG(ERROR) << dex2oat << " failed with dex-file=" << dex_filename;
return false;
}
}
return true;
}
void ClassLinker::RegisterOatFile(const OatFile& oat_file) {
WriterMutexLock mu(Thread::Current(), dex_lock_);
RegisterOatFileLocked(oat_file);
}
void ClassLinker::RegisterOatFileLocked(const OatFile& oat_file) {
dex_lock_.AssertExclusiveHeld(Thread::Current());
if (kIsDebugBuild) {
for (size_t i = 0; i < oat_files_.size(); ++i) {
CHECK_NE(&oat_file, oat_files_[i]) << oat_file.GetLocation();
}
}
VLOG(class_linker) << "Registering " << oat_file.GetLocation();
oat_files_.push_back(&oat_file);
}
OatFile& ClassLinker::GetImageOatFile(gc::space::ImageSpace* space) {
VLOG(startup) << "ClassLinker::GetImageOatFile entering";
OatFile& oat_file = space->ReleaseOatFile();
WriterMutexLock mu(Thread::Current(), dex_lock_);
RegisterOatFileLocked(oat_file);
VLOG(startup) << "ClassLinker::GetImageOatFile exiting";
return oat_file;
}
const OatFile* ClassLinker::FindOpenedOatFileForDexFile(const DexFile& dex_file) {
ReaderMutexLock mu(Thread::Current(), dex_lock_);
return FindOpenedOatFileFromDexLocation(dex_file.GetLocation(), dex_file.GetLocationChecksum());
}
const OatFile* ClassLinker::FindOpenedOatFileFromDexLocation(const std::string& dex_location,
uint32_t dex_location_checksum) {
for (size_t i = 0; i < oat_files_.size(); i++) {
const OatFile* oat_file = oat_files_[i];
DCHECK(oat_file != NULL);
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location,
&dex_location_checksum,
false);
if (oat_dex_file != NULL) {
return oat_file;
}
}
return NULL;
}
const DexFile* ClassLinker::FindDexFileInOatLocation(const std::string& dex_location,
uint32_t dex_location_checksum,
const std::string& oat_location) {
UniquePtr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, NULL,
!Runtime::Current()->IsCompiler()));
if (oat_file.get() == NULL) {
VLOG(class_linker) << "Failed to find existing oat file at " << oat_location;
return NULL;
}
Runtime* runtime = Runtime::Current();
const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader();
uint32_t expected_image_oat_checksum = image_header.GetOatChecksum();
uint32_t actual_image_oat_checksum = oat_file->GetOatHeader().GetImageFileLocationOatChecksum();
if (expected_image_oat_checksum != actual_image_oat_checksum) {
VLOG(class_linker) << "Failed to find oat file at " << oat_location
<< " with expected image oat checksum of " << expected_image_oat_checksum
<< ", found " << actual_image_oat_checksum;
return NULL;
}
uint32_t expected_image_oat_offset = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin());
uint32_t actual_image_oat_offset = oat_file->GetOatHeader().GetImageFileLocationOatDataBegin();
if (expected_image_oat_offset != actual_image_oat_offset) {
VLOG(class_linker) << "Failed to find oat file at " << oat_location
<< " with expected image oat offset " << expected_image_oat_offset
<< ", found " << actual_image_oat_offset;
return NULL;
}
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum);
if (oat_dex_file == NULL) {
VLOG(class_linker) << "Failed to find oat file at " << oat_location << " containing " << dex_location;
return NULL;
}
uint32_t expected_dex_checksum = dex_location_checksum;
uint32_t actual_dex_checksum = oat_dex_file->GetDexFileLocationChecksum();
if (expected_dex_checksum != actual_dex_checksum) {
VLOG(class_linker) << "Failed to find oat file at " << oat_location
<< " with expected dex checksum of " << expected_dex_checksum
<< ", found " << actual_dex_checksum;
return NULL;
}
RegisterOatFileLocked(*oat_file.release());
return oat_dex_file->OpenDexFile();
}
const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(const std::string& dex_location,
uint32_t dex_location_checksum,
const std::string& oat_location) {
WriterMutexLock mu(Thread::Current(), dex_lock_);
return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_location);
}
class ScopedFlock {
public:
ScopedFlock() {}
bool Init(const std::string& filename) {
while (true) {
file_.reset(OS::OpenFileWithFlags(filename.c_str(), O_CREAT | O_RDWR));
if (file_.get() == NULL) {
LOG(ERROR) << "Failed to open file: " << filename;
return false;
}
int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX));
if (flock_result != 0) {
PLOG(ERROR) << "Failed to lock file: " << filename;
return false;
}
struct stat fstat_stat;
int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat));
if (fstat_result != 0) {
PLOG(ERROR) << "Failed to fstat: " << filename;
return false;
}
struct stat stat_stat;
int stat_result = TEMP_FAILURE_RETRY(stat(filename.c_str(), &stat_stat));
if (stat_result != 0) {
PLOG(WARNING) << "Failed to stat, will retry: " << filename;
// ENOENT can happen if someone racing with us unlinks the file we created so just retry.
continue;
}
if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) {
LOG(WARNING) << "File changed while locking, will retry: " << filename;
continue;
}
return true;
}
}
File& GetFile() {
return *file_;
}
~ScopedFlock() {
if (file_.get() != NULL) {
int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN));
CHECK_EQ(0, flock_result);
}
}
private:
UniquePtr<File> file_;
DISALLOW_COPY_AND_ASSIGN(ScopedFlock);
};
const DexFile* ClassLinker::FindOrCreateOatFileForDexLocationLocked(const std::string& dex_location,
uint32_t dex_location_checksum,
const std::string& oat_location) {
// We play a locking game here so that if two different processes
// race to generate (or worse, one tries to open a partial generated
// file) we will be okay. This is actually common with apps that use
// DexClassLoader to work around the dex method reference limit and
// that have a background service running in a separate process.
ScopedFlock scoped_flock;
if (!scoped_flock.Init(oat_location)) {
LOG(ERROR) << "Failed to open locked oat file: " << oat_location;
return NULL;
}
// Check if we already have an up-to-date output file
const DexFile* dex_file = FindDexFileInOatLocation(dex_location,
dex_location_checksum,
oat_location);
if (dex_file != NULL) {
return dex_file;
}
// Generate the output oat file for the dex file
VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location;
if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location)) {
LOG(ERROR) << "Failed to generate oat file: " << oat_location;
return NULL;
}
const OatFile* oat_file = OatFile::Open(oat_location, oat_location, NULL,
!Runtime::Current()->IsCompiler());
if (oat_file == NULL) {
LOG(ERROR) << "Failed to open generated oat file: " << oat_location;
return NULL;
}
RegisterOatFileLocked(*oat_file);
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum);
if (oat_dex_file == NULL) {
LOG(ERROR) << "Failed to find dex file " << dex_location
<< " (checksum " << dex_location_checksum
<< ") in generated oat file: " << oat_location;
return NULL;
}
const DexFile* result = oat_dex_file->OpenDexFile();
CHECK_EQ(dex_location_checksum, result->GetLocationChecksum())
<< "dex_location=" << dex_location << " oat_location=" << oat_location << std::hex
<< " dex_location_checksum=" << dex_location_checksum
<< " DexFile::GetLocationChecksum()=" << result->GetLocationChecksum();
return result;
}
bool ClassLinker::VerifyOatFileChecksums(const OatFile* oat_file,
const std::string& dex_location,
uint32_t dex_location_checksum) {
Runtime* runtime = Runtime::Current();
const ImageHeader& image_header = runtime->GetHeap()->GetImageSpace()->GetImageHeader();
uint32_t image_oat_checksum = image_header.GetOatChecksum();
uint32_t image_oat_data_begin = reinterpret_cast<uint32_t>(image_header.GetOatDataBegin());
bool image_check = ((oat_file->GetOatHeader().GetImageFileLocationOatChecksum() == image_oat_checksum)
&& (oat_file->GetOatHeader().GetImageFileLocationOatDataBegin() == image_oat_data_begin));
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, &dex_location_checksum);
if (oat_dex_file == NULL) {
LOG(ERROR) << "oat file " << oat_file->GetLocation()
<< " does not contain contents for " << dex_location
<< " with checksum " << dex_location_checksum;
std::vector<const OatFile::OatDexFile*> oat_dex_files = oat_file->GetOatDexFiles();
for (size_t i = 0; i < oat_dex_files.size(); i++) {
const OatFile::OatDexFile* oat_dex_file = oat_dex_files[i];
LOG(ERROR) << "oat file " << oat_file->GetLocation()
<< " contains contents for " << oat_dex_file->GetDexFileLocation();
}
return false;
}
bool dex_check = dex_location_checksum == oat_dex_file->GetDexFileLocationChecksum();
if (image_check && dex_check) {
return true;
}
if (!image_check) {
std::string image_file(image_header.GetImageRoot(
ImageHeader::kOatLocation)->AsString()->ToModifiedUtf8());
LOG(WARNING) << "oat file " << oat_file->GetLocation()
<< " mismatch (" << std::hex << oat_file->GetOatHeader().GetImageFileLocationOatChecksum()
<< ", " << oat_file->GetOatHeader().GetImageFileLocationOatDataBegin()
<< ") with " << image_file
<< " (" << image_oat_checksum << ", " << std::hex << image_oat_data_begin << ")";
}
if (!dex_check) {
LOG(WARNING) << "oat file " << oat_file->GetLocation()
<< " mismatch (" << std::hex << oat_dex_file->GetDexFileLocationChecksum()
<< ") with " << dex_location
<< " (" << std::hex << dex_location_checksum << ")";
}
return false;
}
const DexFile* ClassLinker::VerifyAndOpenDexFileFromOatFile(const OatFile* oat_file,
const std::string& dex_location,
uint32_t dex_location_checksum) {
bool verified = VerifyOatFileChecksums(oat_file, dex_location, dex_location_checksum);
if (!verified) {
delete oat_file;
return NULL;
}
RegisterOatFileLocked(*oat_file);
return oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile();
}
const DexFile* ClassLinker::FindDexFileInOatFileFromDexLocation(const std::string& dex_location,
uint32_t dex_location_checksum) {
WriterMutexLock mu(Thread::Current(), dex_lock_);
const OatFile* open_oat_file = FindOpenedOatFileFromDexLocation(dex_location,
dex_location_checksum);
if (open_oat_file != NULL) {
return open_oat_file->GetOatDexFile(dex_location, &dex_location_checksum)->OpenDexFile();
}
// Look for an existing file next to dex. for example, for
// /foo/bar/baz.jar, look for /foo/bar/baz.odex.
std::string odex_filename(OatFile::DexFilenameToOdexFilename(dex_location));
UniquePtr<const OatFile> oat_file(FindOatFileFromOatLocationLocked(odex_filename));
if (oat_file.get() != NULL) {
uint32_t dex_location_checksum;
if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) {
// If no classes.dex found in dex_location, it has been stripped, assume oat is up-to-date.
// This is the common case in user builds for jar's and apk's in the /system directory.
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_location, NULL);
CHECK(oat_dex_file != NULL) << odex_filename << " " << dex_location;
RegisterOatFileLocked(*oat_file);
return oat_dex_file->OpenDexFile();
}
const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(),
dex_location,
dex_location_checksum);
if (dex_file != NULL) {
return dex_file;
}
}
// Look for an existing file in the dalvik-cache, validating the result if found
// not found in /foo/bar/baz.odex? try /data/dalvik-cache/foo@bar@baz.jar@classes.dex
std::string cache_location(GetDalvikCacheFilenameOrDie(dex_location));
oat_file.reset(FindOatFileFromOatLocationLocked(cache_location));
if (oat_file.get() != NULL) {
uint32_t dex_location_checksum;
if (!DexFile::GetChecksum(dex_location, &dex_location_checksum)) {
LOG(WARNING) << "Failed to compute checksum: " << dex_location;
return NULL;
}
const DexFile* dex_file = VerifyAndOpenDexFileFromOatFile(oat_file.release(),
dex_location,
dex_location_checksum);
if (dex_file != NULL) {
return dex_file;
}
if (TEMP_FAILURE_RETRY(unlink(cache_location.c_str())) != 0) {
PLOG(FATAL) << "Failed to remove obsolete oat file from " << cache_location;
}
}
LOG(INFO) << "Failed to open oat file from " << odex_filename << " or " << cache_location << ".";
// Try to generate oat file if it wasn't found or was obsolete.
std::string oat_cache_filename(GetDalvikCacheFilenameOrDie(dex_location));
return FindOrCreateOatFileForDexLocationLocked(dex_location, dex_location_checksum, oat_cache_filename);
}
const OatFile* ClassLinker::FindOpenedOatFileFromOatLocation(const std::string& oat_location) {
for (size_t i = 0; i < oat_files_.size(); i++) {
const OatFile* oat_file = oat_files_[i];
DCHECK(oat_file != NULL);
if (oat_file->GetLocation() == oat_location) {
return oat_file;
}
}
return NULL;
}
const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_location) {
ReaderMutexLock mu(Thread::Current(), dex_lock_);
return FindOatFileFromOatLocationLocked(oat_location);
}
const OatFile* ClassLinker::FindOatFileFromOatLocationLocked(const std::string& oat_location) {
const OatFile* oat_file = FindOpenedOatFileFromOatLocation(oat_location);
if (oat_file != NULL) {
return oat_file;
}
oat_file = OatFile::Open(oat_location, oat_location, NULL, !Runtime::Current()->IsCompiler());
if (oat_file == NULL) {
return NULL;
}
return oat_file;
}
static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg);
DCHECK(obj != NULL);
DCHECK(class_linker != NULL);
if (obj->IsArtMethod()) {
mirror::ArtMethod* method = obj->AsArtMethod();
if (!method->IsNative()) {
method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge);
if (method != Runtime::Current()->GetResolutionMethod()) {
method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge());
}
}
}
}
void ClassLinker::InitFromImage() {
VLOG(startup) << "ClassLinker::InitFromImage entering";
CHECK(!init_done_);
gc::Heap* heap = Runtime::Current()->GetHeap();
gc::space::ImageSpace* space = heap->GetImageSpace();
dex_cache_image_class_lookup_required_ = true;
CHECK(space != NULL);
OatFile& oat_file = GetImageOatFile(space);
CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatChecksum(), 0U);
CHECK_EQ(oat_file.GetOatHeader().GetImageFileLocationOatDataBegin(), 0U);
CHECK(oat_file.GetOatHeader().GetImageFileLocation().empty());
portable_resolution_trampoline_ = oat_file.GetOatHeader().GetPortableResolutionTrampoline();
quick_resolution_trampoline_ = oat_file.GetOatHeader().GetQuickResolutionTrampoline();
mirror::Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches);
mirror::ObjectArray<mirror::DexCache>* dex_caches =
dex_caches_object->AsObjectArray<mirror::DexCache>();
mirror::ObjectArray<mirror::Class>* class_roots =
space->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>();
class_roots_ = class_roots;
// Special case of setting up the String class early so that we can test arbitrary objects
// as being Strings or not
mirror::String::SetClass(GetClassRoot(kJavaLangString));
CHECK_EQ(oat_file.GetOatHeader().GetDexFileCount(),
static_cast<uint32_t>(dex_caches->GetLength()));
Thread* self = Thread::Current();
for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
SirtRef<mirror::DexCache> dex_cache(self, dex_caches->Get(i));
const std::string& dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8());
const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(dex_file_location, NULL);
CHECK(oat_dex_file != NULL) << oat_file.GetLocation() << " " << dex_file_location;
const DexFile* dex_file = oat_dex_file->OpenDexFile();
if (dex_file == NULL) {
LOG(FATAL) << "Failed to open dex file " << dex_file_location
<< " from within oat file " << oat_file.GetLocation();
}
CHECK_EQ(dex_file->GetLocationChecksum(), oat_dex_file->GetDexFileLocationChecksum());
AppendToBootClassPath(*dex_file, dex_cache);
}
// Set classes on AbstractMethod early so that IsMethod tests can be performed during the live
// bitmap walk.
mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod));
// Set entry point to interpreter if in InterpretOnly mode.
if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) {
ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_);
heap->FlushAllocStack();
heap->GetLiveBitmap()->Walk(InitFromImageInterpretOnlyCallback, this);
}
// reinit class_roots_
mirror::Class::SetClassClass(class_roots->Get(kJavaLangClass));
class_roots_ = class_roots;
// reinit array_iftable_ from any array class instance, they should be ==
array_iftable_ = GetClassRoot(kObjectArrayClass)->GetIfTable();
DCHECK(array_iftable_ == GetClassRoot(kBooleanArrayClass)->GetIfTable());
// String class root was set above
mirror::ArtField::SetClass(GetClassRoot(kJavaLangReflectArtField));
mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass));
mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass));
mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass));
mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass));
mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass));
mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass));
mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass));
mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass));
mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable));
mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement));
FinishInit();
VLOG(startup) << "ClassLinker::InitFromImage exiting";
}
// Keep in sync with InitCallback. Anything we visit, we need to
// reinit references to when reinitializing a ClassLinker from a
// mapped image.
void ClassLinker::VisitRoots(RootVisitor* visitor, void* arg, bool only_dirty, bool clean_dirty) {
visitor(class_roots_, arg);
Thread* self = Thread::Current();
{
ReaderMutexLock mu(self, dex_lock_);
if (!only_dirty || dex_caches_dirty_) {
for (mirror::DexCache* dex_cache : dex_caches_) {
visitor(dex_cache, arg);
}
if (clean_dirty) {
dex_caches_dirty_ = false;
}
}
}
{
ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_);
if (!only_dirty || class_table_dirty_) {
for (const std::pair<size_t, mirror::Class*>& it : class_table_) {
visitor(it.second, arg);
}
if (clean_dirty) {
class_table_dirty_ = false;
}
}
// We deliberately ignore the class roots in the image since we
// handle image roots by using the MS/CMS rescanning of dirty cards.
}
visitor(array_iftable_, arg);
}
void ClassLinker::VisitClasses(ClassVisitor* visitor, void* arg) {
if (dex_cache_image_class_lookup_required_) {
MoveImageClassesToClassTable();
}
ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
for (const std::pair<size_t, mirror::Class*>& it : class_table_) {
if (!visitor(it.second, arg)) {
return;
}
}
}
static bool GetClassesVisitor(mirror::Class* c, void* arg) {
std::set<mirror::Class*>* classes = reinterpret_cast<std::set<mirror::Class*>*>(arg);
classes->insert(c);
return true;
}
void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg) {
std::set<mirror::Class*> classes;
VisitClasses(GetClassesVisitor, &classes);
for (mirror::Class* klass : classes) {
if (!visitor(klass, arg)) {
return;
}
}
}
ClassLinker::~ClassLinker() {
mirror::Class::ResetClass();
mirror::String::ResetClass();
mirror::ArtField::ResetClass();
mirror::ArtMethod::ResetClass();
mirror::BooleanArray::ResetArrayClass();
mirror::ByteArray::ResetArrayClass();
mirror::CharArray::ResetArrayClass();
mirror::DoubleArray::ResetArrayClass();
mirror::FloatArray::ResetArrayClass();
mirror::IntArray::ResetArrayClass();
mirror::LongArray::ResetArrayClass();
mirror::ShortArray::ResetArrayClass();
mirror::Throwable::ResetClass();
mirror::StackTraceElement::ResetClass();
STLDeleteElements(&boot_class_path_);
STLDeleteElements(&oat_files_);
}
mirror::DexCache* ClassLinker::AllocDexCache(Thread* self, const DexFile& dex_file) {
gc::Heap* heap = Runtime::Current()->GetHeap();
mirror::Class* dex_cache_class = GetClassRoot(kJavaLangDexCache);
SirtRef<mirror::DexCache> dex_cache(self,
down_cast<mirror::DexCache*>(heap->AllocObject(self, dex_cache_class,
dex_cache_class->GetObjectSize())));
if (dex_cache.get() == NULL) {
return NULL;
}
SirtRef<mirror::String>
location(self, intern_table_->InternStrong(dex_file.GetLocation().c_str()));
if (location.get() == NULL) {
return NULL;
}
SirtRef<mirror::ObjectArray<mirror::String> >
strings(self, AllocStringArray(self, dex_file.NumStringIds()));
if (strings.get() == NULL) {
return NULL;
}
SirtRef<mirror::ObjectArray<mirror::Class> >
types(self, AllocClassArray(self, dex_file.NumTypeIds()));
if (types.get() == NULL) {
return NULL;
}
SirtRef<mirror::ObjectArray<mirror::ArtMethod> >
methods(self, AllocArtMethodArray(self, dex_file.NumMethodIds()));
if (methods.get() == NULL) {
return NULL;
}
SirtRef<mirror::ObjectArray<mirror::ArtField> >
fields(self, AllocArtFieldArray(self, dex_file.NumFieldIds()));
if (fields.get() == NULL) {
return NULL;
}
SirtRef<mirror::ObjectArray<mirror::StaticStorageBase> >
initialized_static_storage(self,
AllocObjectArray<mirror::StaticStorageBase>(self, dex_file.NumTypeIds()));
if (initialized_static_storage.get() == NULL) {
return NULL;
}
dex_cache->Init(&dex_file,
location.get(),
strings.get(),
types.get(),
methods.get(),
fields.get(),
initialized_static_storage.get());
return dex_cache.get();
}
mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class,
size_t class_size) {
DCHECK_GE(class_size, sizeof(mirror::Class));
gc::Heap* heap = Runtime::Current()->GetHeap();
mirror::Object* k = heap->AllocObject(self, java_lang_Class, class_size);
if (UNLIKELY(k == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return NULL;
}
mirror::Class* klass = k->AsClass();
klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive.
klass->SetClassSize(class_size);
klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index.
klass->SetDexTypeIndex(DexFile::kDexNoIndex16); // Default to no valid type index.
return klass;
}
mirror::Class* ClassLinker::AllocClass(Thread* self, size_t class_size) {
return AllocClass(self, GetClassRoot(kJavaLangClass), class_size);
}
mirror::ArtField* ClassLinker::AllocArtField(Thread* self) {
return down_cast<mirror::ArtField*>(GetClassRoot(kJavaLangReflectArtField)->AllocObject(self));
}
mirror::ArtMethod* ClassLinker::AllocArtMethod(Thread* self) {
return down_cast<mirror::ArtMethod*>(GetClassRoot(kJavaLangReflectArtMethod)->AllocObject(self));
}
mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(Thread* self,
size_t length) {
return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(self,
GetClassRoot(kJavaLangStackTraceElementArrayClass),
length);
}
static mirror::Class* EnsureResolved(Thread* self, mirror::Class* klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(klass != NULL);
// Wait for the class if it has not already been linked.
if (!klass->IsResolved() && !klass->IsErroneous()) {
ObjectLock lock(self, klass);
// Check for circular dependencies between classes.
if (!klass->IsResolved() && klass->GetClinitThreadId() == self->GetTid()) {
ThrowClassCircularityError(klass);
klass->SetStatus(mirror::Class::kStatusError, self);
return NULL;
}
// Wait for the pending initialization to complete.
while (!klass->IsResolved() && !klass->IsErroneous()) {
lock.WaitIgnoringInterrupts();
}
}
if (klass->IsErroneous()) {
ThrowEarlierClassFailure(klass);
return NULL;
}
// Return the loaded class. No exceptions should be pending.
CHECK(klass->IsResolved()) << PrettyClass(klass);
self->AssertNoPendingException();
return klass;
}
bool ClassLinker::IsInBootClassPath(const char* descriptor) {
DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_);
return pair.second != NULL;
}
mirror::Class* ClassLinker::FindSystemClass(const char* descriptor) {
return FindClass(descriptor, NULL);
}
mirror::Class* ClassLinker::FindClass(const char* descriptor, mirror::ClassLoader* class_loader) {
DCHECK_NE(*descriptor, '\0') << "descriptor is empty string";
Thread* self = Thread::Current();
DCHECK(self != NULL);
self->AssertNoPendingException();
if (descriptor[1] == '\0') {
// only the descriptors of primitive types should be 1 character long, also avoid class lookup
// for primitive classes that aren't backed by dex files.
return FindPrimitiveClass(descriptor[0]);
}
// Find the class in the loaded classes table.
mirror::Class* klass = LookupClass(descriptor, class_loader);
if (klass != NULL) {
return EnsureResolved(self, klass);
}
// Class is not yet loaded.
if (descriptor[0] == '[') {
return CreateArrayClass(descriptor, class_loader);
} else if (class_loader == NULL) {
DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, boot_class_path_);
if (pair.second != NULL) {
return DefineClass(descriptor, NULL, *pair.first, *pair.second);
}
} else if (Runtime::Current()->UseCompileTimeClassPath()) {
// First try the boot class path, we check the descriptor first to avoid an unnecessary
// throw of a NoClassDefFoundError.
if (IsInBootClassPath(descriptor)) {
mirror::Class* system_class = FindSystemClass(descriptor);
CHECK(system_class != NULL);
return system_class;
}
// Next try the compile time class path.
const std::vector<const DexFile*>* class_path;
{
ScopedObjectAccessUnchecked soa(self);
ScopedLocalRef<jobject> jclass_loader(soa.Env(), soa.AddLocalReference<jobject>(class_loader));
class_path = &Runtime::Current()->GetCompileTimeClassPath(jclass_loader.get());
}
DexFile::ClassPathEntry pair = DexFile::FindInClassPath(descriptor, *class_path);
if (pair.second != NULL) {
return DefineClass(descriptor, class_loader, *pair.first, *pair.second);
}
} else {
ScopedObjectAccessUnchecked soa(self->GetJniEnv());
ScopedLocalRef<jobject> class_loader_object(soa.Env(),
soa.AddLocalReference<jobject>(class_loader));
std::string class_name_string(DescriptorToDot(descriptor));
ScopedLocalRef<jobject> result(soa.Env(), NULL);
{
ScopedThreadStateChange tsc(self, kNative);
ScopedLocalRef<jobject> class_name_object(soa.Env(),
soa.Env()->NewStringUTF(class_name_string.c_str()));
if (class_name_object.get() == NULL) {
return NULL;
}
CHECK(class_loader_object.get() != NULL);
result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(),
WellKnownClasses::java_lang_ClassLoader_loadClass,
class_name_object.get()));
}
if (soa.Self()->IsExceptionPending()) {
// If the ClassLoader threw, pass that exception up.
return NULL;
} else if (result.get() == NULL) {
// broken loader - throw NPE to be compatible with Dalvik
ThrowNullPointerException(NULL, StringPrintf("ClassLoader.loadClass returned null for %s",
class_name_string.c_str()).c_str());
return NULL;
} else {
// success, return mirror::Class*
return soa.Decode<mirror::Class*>(result.get());
}
}
ThrowNoClassDefFoundError("Class %s not found", PrintableString(descriptor).c_str());
return NULL;
}
mirror::Class* ClassLinker::DefineClass(const char* descriptor,
mirror::ClassLoader* class_loader,
const DexFile& dex_file,
const DexFile::ClassDef& dex_class_def) {
Thread* self = Thread::Current();
SirtRef<mirror::Class> klass(self, NULL);
// Load the class from the dex file.
if (UNLIKELY(!init_done_)) {
// finish up init of hand crafted class_roots_
if (strcmp(descriptor, "Ljava/lang/Object;") == 0) {
klass.reset(GetClassRoot(kJavaLangObject));
} else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) {
klass.reset(GetClassRoot(kJavaLangClass));
} else if (strcmp(descriptor, "Ljava/lang/String;") == 0) {
klass.reset(GetClassRoot(kJavaLangString));
} else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) {
klass.reset(GetClassRoot(kJavaLangDexCache));
} else if (strcmp(descriptor, "Ljava/lang/reflect/ArtField;") == 0) {
klass.reset(GetClassRoot(kJavaLangReflectArtField));
} else if (strcmp(descriptor, "Ljava/lang/reflect/ArtMethod;") == 0) {
klass.reset(GetClassRoot(kJavaLangReflectArtMethod));
} else {
klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def)));
}
} else {
klass.reset(AllocClass(self, SizeOfClass(dex_file, dex_class_def)));
}
if (UNLIKELY(klass.get() == NULL)) {
CHECK(self->IsExceptionPending()); // Expect an OOME.
return NULL;
}
klass->SetDexCache(FindDexCache(dex_file));
LoadClass(dex_file, dex_class_def, klass, class_loader);
// Check for a pending exception during load
if (self->IsExceptionPending()) {
klass->SetStatus(mirror::Class::kStatusError, self);
return NULL;
}
ObjectLock lock(self, klass.get());
klass->SetClinitThreadId(self->GetTid());
{
// Add the newly loaded class to the loaded classes table.
mirror::Class* existing = InsertClass(descriptor, klass.get(), Hash(descriptor));
if (existing != NULL) {
// We failed to insert because we raced with another thread. Calling EnsureResolved may cause
// this thread to block.
return EnsureResolved(self, existing);
}
}
// Finish loading (if necessary) by finding parents
CHECK(!klass->IsLoaded());
if (!LoadSuperAndInterfaces(klass, dex_file)) {
// Loading failed.
klass->SetStatus(mirror::Class::kStatusError, self);
return NULL;
}
CHECK(klass->IsLoaded());
// Link the class (if necessary)
CHECK(!klass->IsResolved());
if (!LinkClass(klass, NULL, self)) {
// Linking failed.
klass->SetStatus(mirror::Class::kStatusError, self);
return NULL;
}
CHECK(klass->IsResolved());
/*
* We send CLASS_PREPARE events to the debugger from here. The
* definition of "preparation" is creating the static fields for a
* class and initializing them to the standard default values, but not
* executing any code (that comes later, during "initialization").
*
* We did the static preparation in LinkClass.
*
* The class has been prepared and resolved but possibly not yet verified
* at this point.
*/
Dbg::PostClassPrepare(klass.get());
return klass.get();
}
// Precomputes size that will be needed for Class, matching LinkStaticFields
size_t ClassLinker::SizeOfClass(const DexFile& dex_file,
const DexFile::ClassDef& dex_class_def) {
const byte* class_data = dex_file.GetClassData(dex_class_def);
size_t num_ref = 0;
size_t num_32 = 0;
size_t num_64 = 0;
if (class_data != NULL) {
for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) {
const DexFile::FieldId& field_id = dex_file.GetFieldId(it.GetMemberIndex());
const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id);
char c = descriptor[0];
if (c == 'L' || c == '[') {
num_ref++;
} else if (c == 'J' || c == 'D') {
num_64++;
} else {
num_32++;
}
}
}
// start with generic class data
size_t size = sizeof(mirror::Class);
// follow with reference fields which must be contiguous at start
size += (num_ref * sizeof(uint32_t));
// if there are 64-bit fields to add, make sure they are aligned
if (num_64 != 0 && size != RoundUp(size, 8)) { // for 64-bit alignment
if (num_32 != 0) {
// use an available 32-bit field for padding
num_32--;
}
size += sizeof(uint32_t); // either way, we are adding a word
DCHECK_EQ(size, RoundUp(size, 8));
}
// tack on any 64-bit fields now that alignment is assured
size += (num_64 * sizeof(uint64_t));
// tack on any remaining 32-bit fields
size += (num_32 * sizeof(uint32_t));
return size;
}
const OatFile::OatClass* ClassLinker::GetOatClass(const DexFile& dex_file, uint16_t class_def_idx) {
DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16);
const OatFile* oat_file = FindOpenedOatFileForDexFile(dex_file);
CHECK(oat_file != NULL) << dex_file.GetLocation();
uint dex_location_checksum = dex_file.GetLocationChecksum();
const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(dex_file.GetLocation(),
&dex_location_checksum);
CHECK(oat_dex_file != NULL) << dex_file.GetLocation();
const OatFile::OatClass* oat_class = oat_dex_file->GetOatClass(class_def_idx);
CHECK(oat_class != NULL) << dex_file.GetLocation() << " " << class_def_idx;
return oat_class;
}
static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file, uint16_t class_def_idx,
uint32_t method_idx) {
const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx);
const byte* class_data = dex_file.GetClassData(class_def);
CHECK(class_data != NULL);
ClassDataItemIterator it(dex_file, class_data);
// Skip fields
while (it.HasNextStaticField()) {
it.Next();
}
while (it.HasNextInstanceField()) {
it.Next();
}
// Process methods
size_t class_def_method_index = 0;
while (it.HasNextDirectMethod()) {
if (it.GetMemberIndex() == method_idx) {
return class_def_method_index;
}
class_def_method_index++;
it.Next();
}
while (it.HasNextVirtualMethod()) {
if (it.GetMemberIndex() == method_idx) {
return class_def_method_index;
}
class_def_method_index++;
it.Next();
}
DCHECK(!it.HasNext());
LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation();
return 0;
}
const OatFile::OatMethod ClassLinker::GetOatMethodFor(const mirror::ArtMethod* method) {
// Although we overwrite the trampoline of non-static methods, we may get here via the resolution
// method for direct methods (or virtual methods made direct).
mirror::Class* declaring_class = method->GetDeclaringClass();
size_t oat_method_index;
if (method->IsStatic() || method->IsDirect()) {
// Simple case where the oat method index was stashed at load time.
oat_method_index = method->GetMethodIndex();
} else {
// We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index
// by search for its position in the declared virtual methods.
oat_method_index = declaring_class->NumDirectMethods();
size_t end = declaring_class->NumVirtualMethods();
bool found = false;
for (size_t i = 0; i < end; i++) {
if (declaring_class->GetVirtualMethod(i) == method) {
found = true;
break;
}
oat_method_index++;
}
CHECK(found) << "Didn't find oat method index for virtual method: " << PrettyMethod(method);
}
UniquePtr<const OatFile::OatClass>
oat_class(GetOatClass(*declaring_class->GetDexCache()->GetDexFile(),
declaring_class->GetDexClassDefIndex()));
CHECK(oat_class.get() != NULL);
DCHECK_EQ(oat_method_index,
GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(),
method->GetDeclaringClass()->GetDexClassDefIndex(),
method->GetDexMethodIndex()));
return oat_class->GetOatMethod(oat_method_index);
}
// Special case to get oat code without overwriting a trampoline.
const void* ClassLinker::GetOatCodeFor(const mirror::ArtMethod* method) {
CHECK(!method->IsAbstract()) << PrettyMethod(method);
if (method->IsProxyMethod()) {
#if !defined(ART_USE_PORTABLE_COMPILER)
return reinterpret_cast<void*>(art_quick_proxy_invoke_handler);
#else
return reinterpret_cast<void*>(art_portable_proxy_invoke_handler);
#endif
}
const void* result = GetOatMethodFor(method).GetCode();
if (result == NULL) {
// No code? You must mean to go into the interpreter.
result = GetCompiledCodeToInterpreterBridge();
}
return result;
}
const void* ClassLinker::GetOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx,
uint32_t method_idx) {
UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, class_def_idx));
CHECK(oat_class.get() != nullptr);
uint32_t oat_method_idx = GetOatMethodIndexFromMethodIndex(dex_file, class_def_idx, method_idx);
return oat_class->GetOatMethod(oat_method_idx).GetCode();
}
// Returns true if the method must run with interpreter, false otherwise.
static bool NeedsInterpreter(const mirror::ArtMethod* method, const void* code) {
if (code == NULL) {
// No code: need interpreter.
return true;
}
#ifdef ART_SEA_IR_MODE
ScopedObjectAccess soa(Thread::Current());
if (std::string::npos != PrettyMethod(method).find("fibonacci")) {
LOG(INFO) << "Found " << PrettyMethod(method);
return false;
}
#endif
// If interpreter mode is enabled, every method (except native and proxy) must
// be run with interpreter.
return Runtime::Current()->GetInstrumentation()->InterpretOnly() &&
!method->IsNative() && !method->IsProxyMethod();
}
void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) {
ClassHelper kh(klass);
const DexFile::ClassDef* dex_class_def = kh.GetClassDef();
CHECK(dex_class_def != NULL);
const DexFile& dex_file = kh.GetDexFile();
const byte* class_data = dex_file.GetClassData(*dex_class_def);
if (class_data == NULL) {
return; // no fields or methods - for example a marker interface
}
Runtime* runtime = Runtime::Current();
if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) {
// OAT file unavailable
return;
}
UniquePtr<const OatFile::OatClass> oat_class(GetOatClass(dex_file, klass->GetDexClassDefIndex()));
CHECK(oat_class.get() != NULL);
ClassDataItemIterator it(dex_file, class_data);
// Skip fields
while (it.HasNextStaticField()) {
it.Next();
}
while (it.HasNextInstanceField()) {
it.Next();
}
// Link the code of methods skipped by LinkCode
for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) {
mirror::ArtMethod* method = klass->GetDirectMethod(method_index);
if (!method->IsStatic()) {
// Only update static methods.
continue;
}
const void* code = oat_class->GetOatMethod(method_index).GetCode();
const bool enter_interpreter = NeedsInterpreter(method, code);
if (enter_interpreter) {
// Use interpreter entry point.
code = GetCompiledCodeToInterpreterBridge();
}
runtime->GetInstrumentation()->UpdateMethodsCode(method, code);
}
// Ignore virtual methods on the iterator.
}
static void LinkCode(SirtRef<mirror::ArtMethod>& method, const OatFile::OatClass* oat_class,
uint32_t method_index)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
// Method shouldn't have already been linked.
DCHECK(method->GetEntryPointFromCompiledCode() == NULL);
// Every kind of method should at least get an invoke stub from the oat_method.
// non-abstract methods also get their code pointers.
const OatFile::OatMethod oat_method = oat_class->GetOatMethod(method_index);
oat_method.LinkMethod(method.get());
// Install entry point from interpreter.
Runtime* runtime = Runtime::Current();
bool enter_interpreter = NeedsInterpreter(method.get(), method->GetEntryPointFromCompiledCode());
if (enter_interpreter) {
method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge);
} else {
method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge);
}
if (method->IsAbstract()) {
method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge());
return;
}
if (method->IsStatic() && !method->IsConstructor()) {
// For static methods excluding the class initializer, install the trampoline.
// It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines
// after initializing class (see ClassLinker::InitializeClass method).
method->SetEntryPointFromCompiledCode(GetResolutionTrampoline(runtime->GetClassLinker()));
} else if (enter_interpreter) {
// Set entry point from compiled code if there's no code or in interpreter only mode.
method->SetEntryPointFromCompiledCode(GetCompiledCodeToInterpreterBridge());
}
if (method->IsNative()) {
// Unregistering restores the dlsym lookup stub.
method->UnregisterNative(Thread::Current());
}
// Allow instrumentation its chance to hijack code.
runtime->GetInstrumentation()->UpdateMethodsCode(method.get(),
method->GetEntryPointFromCompiledCode());
}
void ClassLinker::LoadClass(const DexFile& dex_file,
const DexFile::ClassDef& dex_class_def,
SirtRef<mirror::Class>& klass,
mirror::ClassLoader* class_loader) {
CHECK(klass.get() != NULL);
CHECK(klass->GetDexCache() != NULL);
CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus());
const char* descriptor = dex_file.GetClassDescriptor(dex_class_def);
CHECK(descriptor != NULL);
klass->SetClass(GetClassRoot(kJavaLangClass));
uint32_t access_flags = dex_class_def.access_flags_;
// Make sure that none of our runtime-only flags are set.
CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U);
klass->SetAccessFlags(access_flags);
klass->SetClassLoader(class_loader);
DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot);
klass->SetStatus(mirror::Class::kStatusIdx, NULL);
klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def));
klass->SetDexTypeIndex(dex_class_def.class_idx_);
// Load fields fields.
const byte* class_data = dex_file.GetClassData(dex_class_def);
if (class_data == NULL) {
return; // no fields or methods - for example a marker interface
}
ClassDataItemIterator it(dex_file, class_data);
Thread* self = Thread::Current();
if (it.NumStaticFields() != 0) {
mirror::ObjectArray<mirror::ArtField>* statics = AllocArtFieldArray(self, it.NumStaticFields());
if (UNLIKELY(statics == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetSFields(statics);
}
if (it.NumInstanceFields() != 0) {
mirror::ObjectArray<mirror::ArtField>* fields =
AllocArtFieldArray(self, it.NumInstanceFields());
if (UNLIKELY(fields == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetIFields(fields);
}
for (size_t i = 0; it.HasNextStaticField(); i++, it.Next()) {
SirtRef<mirror::ArtField> sfield(self, AllocArtField(self));
if (UNLIKELY(sfield.get() == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetStaticField(i, sfield.get());
LoadField(dex_file, it, klass, sfield);
}
for (size_t i = 0; it.HasNextInstanceField(); i++, it.Next()) {
SirtRef<mirror::ArtField> ifield(self, AllocArtField(self));
if (UNLIKELY(ifield.get() == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetInstanceField(i, ifield.get());
LoadField(dex_file, it, klass, ifield);
}
UniquePtr<const OatFile::OatClass> oat_class;
if (Runtime::Current()->IsStarted() && !Runtime::Current()->UseCompileTimeClassPath()) {
oat_class.reset(GetOatClass(dex_file, klass->GetDexClassDefIndex()));
}
// Load methods.
if (it.NumDirectMethods() != 0) {
// TODO: append direct methods to class object
mirror::ObjectArray<mirror::ArtMethod>* directs =
AllocArtMethodArray(self, it.NumDirectMethods());
if (UNLIKELY(directs == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetDirectMethods(directs);
}
if (it.NumVirtualMethods() != 0) {
// TODO: append direct methods to class object
mirror::ObjectArray<mirror::ArtMethod>* virtuals =
AllocArtMethodArray(self, it.NumVirtualMethods());
if (UNLIKELY(virtuals == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetVirtualMethods(virtuals);
}
size_t class_def_method_index = 0;
for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) {
SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass));
if (UNLIKELY(method.get() == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetDirectMethod(i, method.get());
if (oat_class.get() != NULL) {
LinkCode(method, oat_class.get(), class_def_method_index);
}
method->SetMethodIndex(class_def_method_index);
class_def_method_index++;
}
for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) {
SirtRef<mirror::ArtMethod> method(self, LoadMethod(self, dex_file, it, klass));
if (UNLIKELY(method.get() == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return;
}
klass->SetVirtualMethod(i, method.get());
DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i);
if (oat_class.get() != NULL) {
LinkCode(method, oat_class.get(), class_def_method_index);
}
class_def_method_index++;
}
DCHECK(!it.HasNext());
}
void ClassLinker::LoadField(const DexFile& /*dex_file*/, const ClassDataItemIterator& it,
SirtRef<mirror::Class>& klass, SirtRef<mirror::ArtField>& dst) {
uint32_t field_idx = it.GetMemberIndex();
dst->SetDexFieldIndex(field_idx);
dst->SetDeclaringClass(klass.get());
dst->SetAccessFlags(it.GetMemberAccessFlags());
}
mirror::ArtMethod* ClassLinker::LoadMethod(Thread* self, const DexFile& dex_file,
const ClassDataItemIterator& it,
SirtRef<mirror::Class>& klass) {
uint32_t dex_method_idx = it.GetMemberIndex();
const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx);
StringPiece method_name(dex_file.GetMethodName(method_id));
mirror::ArtMethod* dst = AllocArtMethod(self);
if (UNLIKELY(dst == NULL)) {
CHECK(self->IsExceptionPending()); // OOME.
return NULL;
}
DCHECK(dst->IsArtMethod()) << PrettyDescriptor(dst->GetClass());
const char* old_cause = self->StartAssertNoThreadSuspension("LoadMethod");
dst->SetDexMethodIndex(dex_method_idx);
dst->SetDeclaringClass(klass.get());
if (method_name == "finalize") {
// Create the prototype for a signature of "()V"
const DexFile::StringId* void_string_id = dex_file.FindStringId("V");
if (void_string_id != NULL) {
const DexFile::TypeId* void_type_id =
dex_file.FindTypeId(dex_file.GetIndexForStringId(*void_string_id));
if (void_type_id != NULL) {
std::vector<uint16_t> no_args;
const DexFile::ProtoId* finalizer_proto =
dex_file.FindProtoId(dex_file.GetIndexForTypeId(*void_type_id), no_args);
if (finalizer_proto != NULL) {
// We have the prototype in the dex file
if (klass->GetClassLoader() != NULL) { // All non-boot finalizer methods are flagged
klass->SetFinalizable();
} else {
ClassHelper kh(klass.get());
StringPiece klass_descriptor(kh.GetDescriptor());
// The Enum class declares a "final" finalize() method to prevent subclasses from
// introducing a finalizer. We don't want to set the finalizable flag for Enum or its
// subclasses, so we exclude it here.
// We also want to avoid setting the flag on Object, where we know that finalize() is
// empty.
if (klass_descriptor != "Ljava/lang/Object;" &&
klass_descriptor != "Ljava/lang/Enum;") {
klass->SetFinalizable();
}
}
}
}
}
}
dst->SetCodeItemOffset(it.GetMethodCodeItemOffset());
dst->SetAccessFlags(it.GetMemberAccessFlags());
dst->SetDexCacheStrings(klass->GetDexCache()->GetStrings());
dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods());
dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes());
dst->SetDexCacheInitializedStaticStorage(klass->GetDexCache()->GetInitializedStaticStorage());
CHECK(dst->IsArtMethod());
self->EndAssertNoThreadSuspension(old_cause);
return dst;
}
void ClassLinker::AppendToBootClassPath(const DexFile& dex_file) {
Thread* self = Thread::Current();
SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file));
CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation();
AppendToBootClassPath(dex_file, dex_cache);
}
void ClassLinker::AppendToBootClassPath(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) {
CHECK(dex_cache.get() != NULL) << dex_file.GetLocation();
boot_class_path_.push_back(&dex_file);
RegisterDexFile(dex_file, dex_cache);
}
bool ClassLinker::IsDexFileRegisteredLocked(const DexFile& dex_file) const {
dex_lock_.AssertSharedHeld(Thread::Current());
for (size_t i = 0; i != dex_caches_.size(); ++i) {
if (dex_caches_[i]->GetDexFile() == &dex_file) {
return true;
}
}
return false;
}
bool ClassLinker::IsDexFileRegistered(const DexFile& dex_file) const {
ReaderMutexLock mu(Thread::Current(), dex_lock_);
return IsDexFileRegisteredLocked(dex_file);
}
void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) {
dex_lock_.AssertExclusiveHeld(Thread::Current());
CHECK(dex_cache.get() != NULL) << dex_file.GetLocation();
CHECK(dex_cache->GetLocation()->Equals(dex_file.GetLocation()))
<< dex_cache->GetLocation()->ToModifiedUtf8() << " " << dex_file.GetLocation();
dex_caches_.push_back(dex_cache.get());
dex_cache->SetDexFile(&dex_file);
dex_caches_dirty_ = true;
}
void ClassLinker::RegisterDexFile(const DexFile& dex_file) {
Thread* self = Thread::Current();
{
ReaderMutexLock mu(self, dex_lock_);
if (IsDexFileRegisteredLocked(dex_file)) {
return;
}
}
// Don't alloc while holding the lock, since allocation may need to
// suspend all threads and another thread may need the dex_lock_ to
// get to a suspend point.
SirtRef<mirror::DexCache> dex_cache(self, AllocDexCache(self, dex_file));
CHECK(dex_cache.get() != NULL) << "Failed to allocate dex cache for " << dex_file.GetLocation();
{
WriterMutexLock mu(self, dex_lock_);
if (IsDexFileRegisteredLocked(dex_file)) {
return;
}
RegisterDexFileLocked(dex_file, dex_cache);
}
}
void ClassLinker::RegisterDexFile(const DexFile& dex_file, SirtRef<mirror::DexCache>& dex_cache) {
WriterMutexLock mu(Thread::Current(), dex_lock_);
RegisterDexFileLocked(dex_file, dex_cache);
}
mirror::DexCache* ClassLinker::FindDexCache(const DexFile& dex_file) const {
ReaderMutexLock mu(Thread::Current(), dex_lock_);
// Search assuming unique-ness of dex file.
for (size_t i = 0; i != dex_caches_.size(); ++i) {
mirror::DexCache* dex_cache = dex_caches_[i];
if (dex_cache->GetDexFile() == &dex_file) {
return dex_cache;
}
}
// Search matching by location name.
std::string location(dex_file.GetLocation());
for (size_t i = 0; i != dex_caches_.size(); ++i) {
mirror::DexCache* dex_cache = dex_caches_[i];
if (dex_cache->GetDexFile()->GetLocation() == location) {
return dex_cache;
}
}
// Failure, dump diagnostic and abort.
for (size_t i = 0; i != dex_caches_.size(); ++i) {
mirror::DexCache* dex_cache = dex_caches_[i];
LOG(ERROR) << "Registered dex file " << i << " = " << dex_cache->GetDexFile()->GetLocation();
}
LOG(FATAL) << "Failed to find DexCache for DexFile " << location;
return NULL;
}
void ClassLinker::FixupDexCaches(mirror::ArtMethod* resolution_method) const {
ReaderMutexLock mu(Thread::Current(), dex_lock_);
for (size_t i = 0; i != dex_caches_.size(); ++i) {
dex_caches_[i]->Fixup(resolution_method);
}
}
mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) {
mirror::Class* klass = AllocClass(self, sizeof(mirror::Class));
if (UNLIKELY(klass == NULL)) {
return NULL;
}
return InitializePrimitiveClass(klass, type);
}
mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type) {
CHECK(primitive_class != NULL);
// Must hold lock on object when initializing.
Thread* self = Thread::Current();
ObjectLock lock(self, primitive_class);
primitive_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract);
primitive_class->SetPrimitiveType(type);
primitive_class->SetStatus(mirror::Class::kStatusInitialized, self);
const char* descriptor = Primitive::Descriptor(type);
mirror::Class* existing = InsertClass(descriptor, primitive_class, Hash(descriptor));
CHECK(existing == NULL) << "InitPrimitiveClass(" << type << ") failed";
return primitive_class;
}
// Create an array class (i.e. the class object for the array, not the
// array itself). "descriptor" looks like "[C" or "[[[[B" or
// "[Ljava/lang/String;".
//
// If "descriptor" refers to an array of primitives, look up the
// primitive type's internally-generated class object.
//
// "class_loader" is the class loader of the class that's referring to
// us. It's used to ensure that we're looking for the element type in
// the right context. It does NOT become the class loader for the
// array class; that always comes from the base element class.
//
// Returns NULL with an exception raised on failure.
mirror::Class* ClassLinker::CreateArrayClass(const char* descriptor,
mirror::ClassLoader* class_loader) {
// Identify the underlying component type
CHECK_EQ('[', descriptor[0]);
mirror::Class* component_type = FindClass(descriptor + 1, class_loader);
if (component_type == NULL) {
DCHECK(Thread::Current()->IsExceptionPending());
return NULL;
}
// See if the component type is already loaded. Array classes are
// always associated with the class loader of their underlying
// element type -- an array of Strings goes with the loader for
// java/lang/String -- so we need to look for it there. (The
// caller should have checked for the existence of the class
// before calling here, but they did so with *their* class loader,
// not the component type's loader.)
//
// If we find it, the caller adds "loader" to the class' initiating
// loader list, which should prevent us from going through this again.
//
// This call is unnecessary if "loader" and "component_type->GetClassLoader()"
// are the same, because our caller (FindClass) just did the
// lookup. (Even if we get this wrong we still have correct behavior,
// because we effectively do this lookup again when we add the new
// class to the hash table --- necessary because of possible races with
// other threads.)
if (class_loader != component_type->GetClassLoader()) {
mirror::Class* new_class = LookupClass(descriptor, component_type->GetClassLoader());
if (new_class != NULL) {
return new_class;
}
}
// Fill out the fields in the Class.
//
// It is possible to execute some methods against arrays, because
// all arrays are subclasses of java_lang_Object_, so we need to set
// up a vtable. We can just point at the one in java_lang_Object_.
//
// Array classes are simple enough that we don't need to do a full
// link step.
Thread* self = Thread::Current();
SirtRef<mirror::Class> new_class(self, NULL);
if (UNLIKELY(!init_done_)) {
// Classes that were hand created, ie not by FindSystemClass
if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) {
new_class.reset(GetClassRoot(kClassArrayClass));
} else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) {
new_class.reset(GetClassRoot(kObjectArrayClass));
} else if (strcmp(descriptor, class_roots_descriptors_[kJavaLangStringArrayClass]) == 0) {
new_class.reset(GetClassRoot(kJavaLangStringArrayClass));
} else if (strcmp(descriptor,
class_roots_descriptors_[kJavaLangReflectArtMethodArrayClass]) == 0) {
new_class.reset(GetClassRoot(kJavaLangReflectArtMethodArrayClass));
} else if (strcmp(descriptor,
class_roots_descriptors_[kJavaLangReflectArtFieldArrayClass]) == 0) {
new_class.reset(GetClassRoot(kJavaLangReflectArtFieldArrayClass));
} else if (strcmp(descriptor, "[C") == 0) {
new_class.reset(GetClassRoot(kCharArrayClass));
} else if (strcmp(descriptor, "[I") == 0) {
new_class.reset(GetClassRoot(kIntArrayClass));
}
}
if (new_class.get() == NULL) {
new_class.reset(AllocClass(self, sizeof(mirror::Class)));
if (new_class.get() == NULL) {
return NULL;
}
new_class->SetComponentType(component_type);
}
ObjectLock lock(self, new_class.get()); // Must hold lock on object when initializing.
DCHECK(new_class->GetComponentType() != NULL);
mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject);
new_class->SetSuperClass(java_lang_Object);
new_class->SetVTable(java_lang_Object->GetVTable());
new_class->SetPrimitiveType(Primitive::kPrimNot);
new_class->SetClassLoader(component_type->GetClassLoader());
new_class->SetStatus(mirror::Class::kStatusInitialized, self);
// don't need to set new_class->SetObjectSize(..)
// because Object::SizeOf delegates to Array::SizeOf
// All arrays have java/lang/Cloneable and java/io/Serializable as
// interfaces. We need to set that up here, so that stuff like
// "instanceof" works right.
//
// Note: The GC could run during the call to FindSystemClass,
// so we need to make sure the class object is GC-valid while we're in
// there. Do this by clearing the interface list so the GC will just
// think that the entries are null.
// Use the single, global copies of "interfaces" and "iftable"
// (remember not to free them for arrays).
CHECK(array_iftable_ != NULL);
new_class->SetIfTable(array_iftable_);
// Inherit access flags from the component type.
int access_flags = new_class->GetComponentType()->GetAccessFlags();
// Lose any implementation detail flags; in particular, arrays aren't finalizable.
access_flags &= kAccJavaFlagsMask;
// Arrays can't be used as a superclass or interface, so we want to add "abstract final"
// and remove "interface".
access_flags |= kAccAbstract | kAccFinal;
access_flags &= ~kAccInterface;
new_class->SetAccessFlags(access_flags);
mirror::Class* existing = InsertClass(descriptor, new_class.get(), Hash(descriptor));
if (existing == NULL) {
return new_class.get();
}
// Another thread must have loaded the class after we
// started but before we finished. Abandon what we've
// done.
//
// (Yes, this happens.)
return existing;
}
mirror::Class* ClassLinker::FindPrimitiveClass(char type) {
switch (Primitive::GetType(type)) {
case Primitive::kPrimByte:
return GetClassRoot(kPrimitiveByte);
case Primitive::kPrimChar:
return GetClassRoot(kPrimitiveChar);
case Primitive::kPrimDouble:
return GetClassRoot(kPrimitiveDouble);
case Primitive::kPrimFloat:
return GetClassRoot(kPrimitiveFloat);
case Primitive::kPrimInt:
return GetClassRoot(kPrimitiveInt);
case Primitive::kPrimLong:
return GetClassRoot(kPrimitiveLong);
case Primitive::kPrimShort:
return GetClassRoot(kPrimitiveShort);
case Primitive::kPrimBoolean:
return GetClassRoot(kPrimitiveBoolean);
case Primitive::kPrimVoid:
return GetClassRoot(kPrimitiveVoid);
case Primitive::kPrimNot:
break;
}
std::string printable_type(PrintableChar(type));
ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str());
return NULL;
}
mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass,
size_t hash) {
if (VLOG_IS_ON(class_linker)) {
mirror::DexCache* dex_cache = klass->GetDexCache();
std::string source;
if (dex_cache != NULL) {
source += " from ";
source += dex_cache->GetLocation()->ToModifiedUtf8();
}
LOG(INFO) << "Loaded class " << descriptor << source;
}
WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
mirror::Class* existing =
LookupClassFromTableLocked(descriptor, klass->GetClassLoader(), hash);
if (existing != NULL) {
return existing;
}
if (kIsDebugBuild && klass->GetClassLoader() == NULL && dex_cache_image_class_lookup_required_) {
// Check a class loaded with the system class loader matches one in the image if the class
// is in the image.
existing = LookupClassFromImage(descriptor);
if (existing != NULL) {
CHECK(klass == existing);
}
}
Runtime::Current()->GetHeap()->VerifyObject(klass);
class_table_.insert(std::make_pair(hash, klass));
class_table_dirty_ = true;
return NULL;
}
bool ClassLinker::RemoveClass(const char* descriptor, const mirror::ClassLoader* class_loader) {
size_t hash = Hash(descriptor);
WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
ClassHelper kh;
for (auto it = class_table_.lower_bound(hash), end = class_table_.end(); it != end && it->first == hash;
++it) {
mirror::Class* klass = it->second;
kh.ChangeClass(klass);
if (strcmp(kh.GetDescriptor(), descriptor) == 0 && klass->GetClassLoader() == class_loader) {
class_table_.erase(it);
return true;
}
}
return false;
}
mirror::Class* ClassLinker::LookupClass(const char* descriptor,
const mirror::ClassLoader* class_loader) {
size_t hash = Hash(descriptor);
{
ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
mirror::Class* result = LookupClassFromTableLocked(descriptor, class_loader, hash);
if (result != NULL) {
return result;
}
}
if (class_loader != NULL || !dex_cache_image_class_lookup_required_) {
return NULL;
} else {
// Lookup failed but need to search dex_caches_.
mirror::Class* result = LookupClassFromImage(descriptor);
if (result != NULL) {
InsertClass(descriptor, result, hash);
} else {
// Searching the image dex files/caches failed, we don't want to get into this situation
// often as map searches are faster, so after kMaxFailedDexCacheLookups move all image
// classes into the class table.
const int32_t kMaxFailedDexCacheLookups = 1000;
if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) {
MoveImageClassesToClassTable();
}
}
return result;
}
}
mirror::Class* ClassLinker::LookupClassFromTableLocked(const char* descriptor,
const mirror::ClassLoader* class_loader,
size_t hash) {
ClassHelper kh(NULL, this);
auto end = class_table_.end();
for (auto it = class_table_.lower_bound(hash); it != end && it->first == hash; ++it) {
mirror::Class* klass = it->second;
kh.ChangeClass(klass);
if (klass->GetClassLoader() == class_loader && strcmp(descriptor, kh.GetDescriptor()) == 0) {
if (kIsDebugBuild) {
// Check for duplicates in the table.
for (++it; it != end && it->first == hash; ++it) {
mirror::Class* klass2 = it->second;
kh.ChangeClass(klass2);
CHECK(!(strcmp(descriptor, kh.GetDescriptor()) == 0 && klass2->GetClassLoader() == class_loader))
<< PrettyClass(klass) << " " << klass << " " << klass->GetClassLoader() << " "
<< PrettyClass(klass2) << " " << klass2 << " " << klass2->GetClassLoader();
}
}
return klass;
}
}
return NULL;
}
static mirror::ObjectArray<mirror::DexCache>* GetImageDexCaches()
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
gc::space::ImageSpace* image = Runtime::Current()->GetHeap()->GetImageSpace();
CHECK(image != NULL);
mirror::Object* root = image->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches);
return root->AsObjectArray<mirror::DexCache>();
}
void ClassLinker::MoveImageClassesToClassTable() {
Thread* self = Thread::Current();
WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
if (!dex_cache_image_class_lookup_required_) {
return; // All dex cache classes are already in the class table.
}
const char* old_no_suspend_cause =
self->StartAssertNoThreadSuspension("Moving image classes to class table");
mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches();
ClassHelper kh(NULL, this);
for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
mirror::DexCache* dex_cache = dex_caches->Get(i);
mirror::ObjectArray<mirror::Class>* types = dex_cache->GetResolvedTypes();
for (int32_t j = 0; j < types->GetLength(); j++) {
mirror::Class* klass = types->Get(j);
if (klass != NULL) {
kh.ChangeClass(klass);
DCHECK(klass->GetClassLoader() == NULL);
const char* descriptor = kh.GetDescriptor();
size_t hash = Hash(descriptor);
mirror::Class* existing = LookupClassFromTableLocked(descriptor, NULL, hash);
if (existing != NULL) {
CHECK(existing == klass) << PrettyClassAndClassLoader(existing) << " != "
<< PrettyClassAndClassLoader(klass);
} else {
class_table_.insert(std::make_pair(hash, klass));
}
}
}
}
class_table_dirty_ = true;
dex_cache_image_class_lookup_required_ = false;
self->EndAssertNoThreadSuspension(old_no_suspend_cause);
}
mirror::Class* ClassLinker::LookupClassFromImage(const char* descriptor) {
Thread* self = Thread::Current();
const char* old_no_suspend_cause =
self->StartAssertNoThreadSuspension("Image class lookup");
mirror::ObjectArray<mirror::DexCache>* dex_caches = GetImageDexCaches();
for (int32_t i = 0; i < dex_caches->GetLength(); ++i) {
mirror::DexCache* dex_cache = dex_caches->Get(i);
const DexFile* dex_file = dex_cache->GetDexFile();
// First search using the class def map, but don't bother for non-class types.
if (descriptor[0] == 'L') {
const DexFile::StringId* descriptor_string_id = dex_file->FindStringId(descriptor);
if (descriptor_string_id != NULL) {
const DexFile::TypeId* type_id =
dex_file->FindTypeId(dex_file->GetIndexForStringId(*descriptor_string_id));
if (type_id != NULL) {
mirror::Class* klass = dex_cache->GetResolvedType(dex_file->GetIndexForTypeId(*type_id));
if (klass != NULL) {
self->EndAssertNoThreadSuspension(old_no_suspend_cause);
return klass;
}
}
}
}
// Now try binary searching the string/type index.
const DexFile::StringId* string_id = dex_file->FindStringId(descriptor);
if (string_id != NULL) {
const DexFile::TypeId* type_id =