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/*
* 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.
*/
#ifndef ART_RUNTIME_CLASS_LINKER_H_
#define ART_RUNTIME_CLASS_LINKER_H_
#include <deque>
#include <string>
#include <utility>
#include <vector>
#include "base/allocator.h"
#include "base/hash_set.h"
#include "base/macros.h"
#include "base/mutex.h"
#include "dex_file.h"
#include "gc_root.h"
#include "jni.h"
#include "oat_file.h"
#include "object_callbacks.h"
namespace art {
namespace gc {
namespace space {
class ImageSpace;
} // namespace space
} // namespace gc
namespace mirror {
class ClassLoader;
class DexCache;
class DexCacheTest_Open_Test;
class IfTable;
template<class T> class ObjectArray;
class StackTraceElement;
} // namespace mirror
template<class T> class Handle;
class InternTable;
template<class T> class ObjectLock;
class Runtime;
class ScopedObjectAccessAlreadyRunnable;
template<size_t kNumReferences> class PACKED(4) StackHandleScope;
typedef bool (ClassVisitor)(mirror::Class* c, void* arg);
enum VisitRootFlags : uint8_t;
class ClassLinker {
public:
// Well known mirror::Class roots accessed via GetClassRoot.
enum ClassRoot {
kJavaLangClass,
kJavaLangObject,
kClassArrayClass,
kObjectArrayClass,
kJavaLangString,
kJavaLangDexCache,
kJavaLangRefReference,
kJavaLangReflectArtField,
kJavaLangReflectArtMethod,
kJavaLangReflectField,
kJavaLangReflectProxy,
kJavaLangStringArrayClass,
kJavaLangReflectArtFieldArrayClass,
kJavaLangReflectArtMethodArrayClass,
kJavaLangReflectFieldArrayClass,
kJavaLangClassLoader,
kJavaLangThrowable,
kJavaLangClassNotFoundException,
kJavaLangStackTraceElement,
kPrimitiveBoolean,
kPrimitiveByte,
kPrimitiveChar,
kPrimitiveDouble,
kPrimitiveFloat,
kPrimitiveInt,
kPrimitiveLong,
kPrimitiveShort,
kPrimitiveVoid,
kBooleanArrayClass,
kByteArrayClass,
kCharArrayClass,
kDoubleArrayClass,
kFloatArrayClass,
kIntArrayClass,
kLongArrayClass,
kShortArrayClass,
kJavaLangStackTraceElementArrayClass,
kClassRootsMax,
};
explicit ClassLinker(InternTable* intern_table);
~ClassLinker();
// Initialize class linker by bootstraping from dex files.
void InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Initialize class linker from one or more images.
void InitFromImage() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds a class by its descriptor, loading it if necessary.
// If class_loader is null, searches boot_class_path_.
mirror::Class* FindClass(Thread* self, const char* descriptor,
Handle<mirror::ClassLoader> class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Find a class in the path class loader, loading it if necessary without using JNI. Hash
// function is supposed to be ComputeModifiedUtf8Hash(descriptor).
mirror::Class* FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Thread* self, const char* descriptor, size_t hash,
Handle<mirror::ClassLoader> class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds a class by its descriptor using the "system" class loader, ie by searching the
// boot_class_path_.
mirror::Class* FindSystemClass(Thread* self, const char* descriptor)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds the array class given for the element class.
mirror::Class* FindArrayClass(Thread* self, mirror::Class** element_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns true if the class linker is initialized.
bool IsInitialized() const {
return init_done_;
}
// Define a new a class based on a ClassDef from a DexFile
mirror::Class* DefineClass(Thread* self, const char* descriptor, size_t hash,
Handle<mirror::ClassLoader> class_loader,
const DexFile& dex_file, const DexFile::ClassDef& dex_class_def)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds a class by its descriptor, returning NULL if it isn't wasn't loaded
// by the given 'class_loader'.
mirror::Class* LookupClass(Thread* self, const char* descriptor, size_t hash,
mirror::ClassLoader* class_loader)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds all the classes with the given descriptor, regardless of ClassLoader.
void LookupClasses(const char* descriptor, std::vector<mirror::Class*>& classes)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* FindPrimitiveClass(char type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// General class unloading is not supported, this is used to prune
// unwanted classes during image writing.
bool RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void DumpAllClasses(int flags)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void DumpForSigQuit(std::ostream& os)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_);
size_t NumLoadedClasses()
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a String with the given index from the DexFile, storing the
// result in the DexCache. The referrer is used to identify the
// target DexCache and ClassLoader to use for resolution.
mirror::String* ResolveString(uint32_t string_idx, mirror::ArtMethod* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a String with the given index from the DexFile, storing the
// result in the DexCache.
mirror::String* ResolveString(const DexFile& dex_file, uint32_t string_idx,
Handle<mirror::DexCache> dex_cache)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a Type with the given index from the DexFile, storing the
// result in the DexCache. The referrer is used to identity the
// target DexCache and ClassLoader to use for resolution.
mirror::Class* ResolveType(const DexFile& dex_file, uint16_t type_idx, mirror::Class* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a Type with the given index from the DexFile, storing the
// result in the DexCache. The referrer is used to identify the
// target DexCache and ClassLoader to use for resolution.
mirror::Class* ResolveType(uint16_t type_idx, mirror::ArtMethod* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* ResolveType(uint16_t type_idx, mirror::ArtField* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a type with the given ID from the DexFile, storing the
// result in DexCache. The ClassLoader is used to search for the
// type, since it may be referenced from but not contained within
// the given DexFile.
mirror::Class* ResolveType(const DexFile& dex_file, uint16_t type_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a method with a given ID from the DexFile, storing the
// result in DexCache. The ClassLinker and ClassLoader are used as
// in ResolveType. What is unique is the method type argument which
// is used to determine if this method is a direct, static, or
// virtual method.
mirror::ArtMethod* ResolveMethod(const DexFile& dex_file,
uint32_t method_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader,
Handle<mirror::ArtMethod> referrer,
InvokeType type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* GetResolvedMethod(uint32_t method_idx, mirror::ArtMethod* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* ResolveMethod(Thread* self, uint32_t method_idx, mirror::ArtMethod** referrer,
InvokeType type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtField* GetResolvedField(uint32_t field_idx, mirror::Class* field_declaring_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtField* ResolveField(uint32_t field_idx, mirror::ArtMethod* referrer,
bool is_static)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a field with a given ID from the DexFile, storing the
// result in DexCache. The ClassLinker and ClassLoader are used as
// in ResolveType. What is unique is the is_static argument which is
// used to determine if we are resolving a static or non-static
// field.
mirror::ArtField* ResolveField(const DexFile& dex_file,
uint32_t field_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader,
bool is_static)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Resolve a field with a given ID from the DexFile, storing the
// result in DexCache. The ClassLinker and ClassLoader are used as
// in ResolveType. No is_static argument is provided so that Java
// field resolution semantics are followed.
mirror::ArtField* ResolveFieldJLS(const DexFile& dex_file, uint32_t field_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Get shorty from method index without resolution. Used to do handlerization.
const char* MethodShorty(uint32_t method_idx, mirror::ArtMethod* referrer, uint32_t* length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns true on success, false if there's an exception pending.
// can_run_clinit=false allows the compiler to attempt to init a class,
// given the restriction that no <clinit> execution is possible.
bool EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields,
bool can_init_parents)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Initializes classes that have instances in the image but that have
// <clinit> methods so they could not be initialized by the compiler.
void RunRootClinits() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void RegisterDexFile(const DexFile& dex_file)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void RegisterDexFile(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
const OatFile* RegisterOatFile(const OatFile* oat_file)
LOCKS_EXCLUDED(dex_lock_);
const std::vector<const DexFile*>& GetBootClassPath() {
return boot_class_path_;
}
void VisitClasses(ClassVisitor* visitor, void* arg)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Less efficient variant of VisitClasses that copies the class_table_ into secondary storage
// so that it can visit individual classes without holding the doesn't hold the
// Locks::classlinker_classes_lock_. As the Locks::classlinker_classes_lock_ isn't held this code
// can race with insertion and deletion of classes while the visitor is being called.
void VisitClassesWithoutClassesLock(ClassVisitor* visitor, void* arg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void VisitClassRoots(RootCallback* callback, void* arg, VisitRootFlags flags)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void VisitRoots(RootCallback* callback, void* arg, VisitRootFlags flags)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::DexCache* FindDexCache(const DexFile& dex_file)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool IsDexFileRegistered(const DexFile& dex_file)
LOCKS_EXCLUDED(dex_lock_) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void FixupDexCaches(mirror::ArtMethod* resolution_method)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds or creates the oat file holding dex_location. Then loads and returns
// all corresponding dex files (there may be more than one dex file loaded
// in the case of multidex).
// This may return the original, unquickened dex files if the oat file could
// not be generated.
//
// Returns an empty vector if the dex files could not be loaded. In this
// case, there will be at least one error message returned describing why no
// dex files could not be loaded. The 'error_msgs' argument must not be
// null, regardless of whether there is an error or not.
//
// This method should not be called with the mutator_lock_ held, because it
// could end up starving GC if we need to generate or relocate any oat
// files.
std::vector<std::unique_ptr<const DexFile>> OpenDexFilesFromOat(
const char* dex_location, const char* oat_location,
std::vector<std::string>* error_msgs)
LOCKS_EXCLUDED(dex_lock_, Locks::mutator_lock_);
// Allocate an instance of a java.lang.Object.
mirror::Object* AllocObject(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// TODO: replace this with multiple methods that allocate the correct managed type.
template <class T>
mirror::ObjectArray<T>* AllocObjectArray(Thread* self, size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::Class>* AllocClassArray(Thread* self, size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::String>* AllocStringArray(Thread* self, size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::ArtMethod>* AllocArtMethodArray(Thread* self, size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::IfTable* AllocIfTable(Thread* self, size_t ifcount)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::ArtField>* AllocArtFieldArray(Thread* self, size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::StackTraceElement>* AllocStackTraceElementArray(Thread* self,
size_t length)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void VerifyClass(Thread* self, Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class* klass,
mirror::Class::Status& oat_file_class_status)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void ResolveClassExceptionHandlerTypes(const DexFile& dex_file,
Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void ResolveMethodExceptionHandlerTypes(const DexFile& dex_file, mirror::ArtMethod* klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa, jstring name,
jobjectArray interfaces, jobject loader, jobjectArray methods,
jobjectArray throws)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
std::string GetDescriptorForProxy(mirror::Class* proxy_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* FindMethodForProxy(mirror::Class* proxy_class,
mirror::ArtMethod* proxy_method)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Get the oat code for a method when its class isn't yet initialized
const void* GetQuickOatCodeFor(mirror::ArtMethod* method)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Get the oat code for a method from a method index.
const void* GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx, uint32_t method_idx)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Get compiled code for a method, return null if no code
// exists. This is unlike Get..OatCodeFor which will return a bridge
// or interpreter entrypoint.
const void* GetOatMethodQuickCodeFor(mirror::ArtMethod* method)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
pid_t GetClassesLockOwner(); // For SignalCatcher.
pid_t GetDexLockOwner(); // For SignalCatcher.
mirror::Class* GetClassRoot(ClassRoot class_root) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static const char* GetClassRootDescriptor(ClassRoot class_root);
// Is the given entry point quick code to run the resolution stub?
bool IsQuickResolutionStub(const void* entry_point) const;
// Is the given entry point quick code to bridge into the interpreter?
bool IsQuickToInterpreterBridge(const void* entry_point) const;
// Is the given entry point quick code to run the generic JNI stub?
bool IsQuickGenericJniStub(const void* entry_point) const;
InternTable* GetInternTable() const {
return intern_table_;
}
// Set the entrypoints up for method to the given code.
void SetEntryPointsToCompiledCode(mirror::ArtMethod* method, const void* method_code) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Set the entrypoints up for method to the enter the interpreter.
void SetEntryPointsToInterpreter(mirror::ArtMethod* method) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Attempts to insert a class into a class table. Returns NULL if
// the class was inserted, otherwise returns an existing class with
// the same descriptor and ClassLoader.
mirror::Class* InsertClass(const char* descriptor, mirror::Class* klass, size_t hash)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Special code to allocate an art method, use this instead of class->AllocObject.
mirror::ArtMethod* AllocArtMethod(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ObjectArray<mirror::Class>* GetClassRoots() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
DCHECK(class_roots != NULL);
return class_roots;
}
// Move all of the image classes into the class table for faster lookups.
void MoveImageClassesToClassTable()
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Move the class table to the pre-zygote table to reduce memory usage. This works by ensuring
// that no more classes are ever added to the pre zygote table which makes it that the pages
// always remain shared dirty instead of private dirty.
void MoveClassTableToPreZygote()
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns true if the method can be called with its direct code pointer, false otherwise.
bool MayBeCalledWithDirectCodePointer(mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Creates a GlobalRef PathClassLoader that can be used to load classes from the given dex files.
// Note: the objects are not completely set up. Do not use this outside of tests and the compiler.
jobject CreatePathClassLoader(Thread* self, std::vector<const DexFile*>& dex_files)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
private:
static void InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
const OatFile::OatMethod FindOatMethodFor(mirror::ArtMethod* method, bool* found)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
OatFile& GetImageOatFile(gc::space::ImageSpace* space)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void FinishInit(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// For early bootstrapping by Init
mirror::Class* AllocClass(Thread* self, mirror::Class* java_lang_Class, uint32_t class_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Alloc* convenience functions to avoid needing to pass in mirror::Class*
// values that are known to the ClassLinker such as
// kObjectArrayClass and kJavaLangString etc.
mirror::Class* AllocClass(Thread* self, uint32_t class_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::DexCache* AllocDexCache(Thread* self, const DexFile& dex_file)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtField* AllocArtField(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* CreatePrimitiveClass(Thread* self, Primitive::Type type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* InitializePrimitiveClass(mirror::Class* primitive_class, Primitive::Type type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* CreateArrayClass(Thread* self, const char* descriptor, size_t hash,
Handle<mirror::ClassLoader> class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void AppendToBootClassPath(Thread* self, const DexFile& dex_file)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void AppendToBootClassPath(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Precomputes size needed for Class, in the case of a non-temporary class this size must be
// sufficient to hold all static fields.
uint32_t SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file,
const DexFile::ClassDef& dex_class_def);
void LoadClass(Thread* self, const DexFile& dex_file, const DexFile::ClassDef& dex_class_def,
Handle<mirror::Class> klass, mirror::ClassLoader* class_loader)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void LoadClassMembers(Thread* self, const DexFile& dex_file, const uint8_t* class_data,
Handle<mirror::Class> klass, const OatFile::OatClass* oat_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void LoadField(const DexFile& dex_file, const ClassDataItemIterator& it,
Handle<mirror::Class> klass, Handle<mirror::ArtField> dst)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* LoadMethod(Thread* self, const DexFile& dex_file,
const ClassDataItemIterator& dex_method,
Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void FixupStaticTrampolines(mirror::Class* klass) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Finds the associated oat class for a dex_file and descriptor. Returns an invalid OatClass on
// error and sets found to false.
OatFile::OatClass FindOatClass(const DexFile& dex_file, uint16_t class_def_idx, bool* found)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void RegisterDexFileLocked(const DexFile& dex_file, Handle<mirror::DexCache> dex_cache)
EXCLUSIVE_LOCKS_REQUIRED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool IsDexFileRegisteredLocked(const DexFile& dex_file)
SHARED_LOCKS_REQUIRED(dex_lock_, Locks::mutator_lock_);
bool InitializeClass(Thread* self, Handle<mirror::Class> klass, bool can_run_clinit,
bool can_init_parents)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool WaitForInitializeClass(Handle<mirror::Class> klass, Thread* self,
ObjectLock<mirror::Class>& lock);
bool ValidateSuperClassDescriptors(Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool IsSameDescriptorInDifferentClassContexts(Thread* self, const char* descriptor,
Handle<mirror::ClassLoader> class_loader1,
Handle<mirror::ClassLoader> class_loader2)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool IsSameMethodSignatureInDifferentClassContexts(Thread* self, mirror::ArtMethod* method,
mirror::Class* klass1,
mirror::Class* klass2)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkClass(Thread* self, const char* descriptor, Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces,
mirror::Class** new_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkSuperClass(Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkMethods(Thread* self, Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces,
StackHandleScope<mirror::Class::kImtSize>* out_imt)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkVirtualMethods(Thread* self, Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkInterfaceMethods(Thread* const self, Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces,
StackHandleScope<mirror::Class::kImtSize>* out_imt)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkInstanceFields(Thread* self, Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, size_t* class_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void LinkCode(Handle<mirror::ArtMethod> method, const OatFile::OatClass* oat_class,
uint32_t class_def_method_index)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void CreateReferenceInstanceOffsets(Handle<mirror::Class> klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// For use by ImageWriter to find DexCaches for its roots
ReaderWriterMutex* DexLock()
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCK_RETURNED(dex_lock_) {
return &dex_lock_;
}
size_t GetDexCacheCount() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, dex_lock_) {
return dex_caches_.size();
}
mirror::DexCache* GetDexCache(size_t idx) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, dex_lock_);
const OatFile::OatDexFile* FindOpenedOatDexFileForDexFile(const DexFile& dex_file)
LOCKS_EXCLUDED(dex_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Find an opened oat dex file that contains dex_location. If oat_location is not nullptr,
// the file must have that location, else any oat location is accepted.
const OatFile::OatDexFile* FindOpenedOatDexFile(const char* oat_location,
const char* dex_location,
const uint32_t* dex_location_checksum)
LOCKS_EXCLUDED(dex_lock_);
const OatFile* FindOpenedOatFileFromOatLocation(const std::string& oat_location)
LOCKS_EXCLUDED(dex_lock_);
mirror::ArtMethod* CreateProxyConstructor(Thread* self, Handle<mirror::Class> klass,
mirror::Class* proxy_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* CreateProxyMethod(Thread* self, Handle<mirror::Class> klass,
Handle<mirror::ArtMethod> prototype)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Ensures that methods have the kAccPreverified bit set. We use the kAccPreverfied bit on the
// class access flags to determine whether this has been done before.
void EnsurePreverifiedMethods(Handle<mirror::Class> c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* LookupClassFromTableLocked(const char* descriptor,
mirror::ClassLoader* class_loader,
size_t hash)
SHARED_LOCKS_REQUIRED(Locks::classlinker_classes_lock_, Locks::mutator_lock_);
mirror::Class* UpdateClass(const char* descriptor, mirror::Class* klass, size_t hash)
LOCKS_EXCLUDED(Locks::classlinker_classes_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* LookupClassFromImage(const char* descriptor)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// EnsureResolved is called to make sure that a class in the class_table_ has been resolved
// before returning it to the caller. Its the responsibility of the thread that placed the class
// in the table to make it resolved. The thread doing resolution must notify on the class' lock
// when resolution has occurred. This happens in mirror::Class::SetStatus. As resolution may
// retire a class, the version of the class in the table is returned and this may differ from
// the class passed in.
mirror::Class* EnsureResolved(Thread* self, const char* descriptor, mirror::Class* klass)
WARN_UNUSED SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void FixupTemporaryDeclaringClass(mirror::Class* temp_class, mirror::Class* new_class)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void SetClassRoot(ClassRoot class_root, mirror::Class* klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Return the quick generic JNI stub for testing.
const void* GetRuntimeQuickGenericJniStub() const;
std::vector<const DexFile*> boot_class_path_;
std::vector<std::unique_ptr<const DexFile>> opened_dex_files_;
mutable ReaderWriterMutex dex_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
std::vector<size_t> new_dex_cache_roots_ GUARDED_BY(dex_lock_);
std::vector<GcRoot<mirror::DexCache>> dex_caches_ GUARDED_BY(dex_lock_);
std::vector<const OatFile*> oat_files_ GUARDED_BY(dex_lock_);
class ClassDescriptorHashEquals {
public:
// Same class loader and descriptor.
std::size_t operator()(const GcRoot<mirror::Class>& root) const NO_THREAD_SAFETY_ANALYSIS;
bool operator()(const GcRoot<mirror::Class>& a, const GcRoot<mirror::Class>& b) const
NO_THREAD_SAFETY_ANALYSIS;
// Same class loader and descriptor.
std::size_t operator()(const std::pair<const char*, mirror::ClassLoader*>& element) const
NO_THREAD_SAFETY_ANALYSIS;
bool operator()(const GcRoot<mirror::Class>& a,
const std::pair<const char*, mirror::ClassLoader*>& b) const
NO_THREAD_SAFETY_ANALYSIS;
// Same descriptor.
bool operator()(const GcRoot<mirror::Class>& a, const char* descriptor) const
NO_THREAD_SAFETY_ANALYSIS;
std::size_t operator()(const char* descriptor) const NO_THREAD_SAFETY_ANALYSIS;
};
class GcRootEmptyFn {
public:
void MakeEmpty(GcRoot<mirror::Class>& item) const {
item = GcRoot<mirror::Class>();
}
bool IsEmpty(const GcRoot<mirror::Class>& item) const {
return item.IsNull();
}
};
// hash set which hashes class descriptor, and compares descriptors nad class loaders. Results
// should be compared for a matching Class descriptor and class loader.
typedef HashSet<GcRoot<mirror::Class>, GcRootEmptyFn, ClassDescriptorHashEquals,
ClassDescriptorHashEquals, TrackingAllocator<GcRoot<mirror::Class>, kAllocatorTagClassTable>>
Table;
// This contains strong roots. To enable concurrent root scanning of
// the class table, be careful to use a read barrier when accessing this.
Table class_table_ GUARDED_BY(Locks::classlinker_classes_lock_);
Table pre_zygote_class_table_ GUARDED_BY(Locks::classlinker_classes_lock_);
std::vector<GcRoot<mirror::Class>> new_class_roots_;
// Do we need to search dex caches to find image classes?
bool dex_cache_image_class_lookup_required_;
// Number of times we've searched dex caches for a class. After a certain number of misses we move
// the classes into the class_table_ to avoid dex cache based searches.
Atomic<uint32_t> failed_dex_cache_class_lookups_;
// Well known mirror::Class roots.
GcRoot<mirror::ObjectArray<mirror::Class>> class_roots_;
// The interface table used by all arrays.
GcRoot<mirror::IfTable> array_iftable_;
// A cache of the last FindArrayClass results. The cache serves to avoid creating array class
// descriptors for the sake of performing FindClass.
static constexpr size_t kFindArrayCacheSize = 16;
GcRoot<mirror::Class> find_array_class_cache_[kFindArrayCacheSize];
size_t find_array_class_cache_next_victim_;
bool init_done_;
bool log_new_dex_caches_roots_ GUARDED_BY(dex_lock_);
bool log_new_class_table_roots_ GUARDED_BY(Locks::classlinker_classes_lock_);
InternTable* intern_table_;
// Trampolines within the image the bounce to runtime entrypoints. Done so that there is a single
// patch point within the image. TODO: make these proper relocations.
const void* quick_resolution_trampoline_;
const void* quick_imt_conflict_trampoline_;
const void* quick_generic_jni_trampoline_;
const void* quick_to_interpreter_bridge_trampoline_;
// Image pointer size.
size_t image_pointer_size_;
friend class ImageWriter; // for GetClassRoots
friend class ImageDumper; // for FindOpenedOatFileFromOatLocation
friend class JniCompilerTest; // for GetRuntimeQuickGenericJniStub
friend class NoDex2OatTest; // for FindOpenedOatFileForDexFile
friend class NoPatchoatTest; // for FindOpenedOatFileForDexFile
ART_FRIEND_TEST(mirror::DexCacheTest, Open); // for AllocDexCache
DISALLOW_COPY_AND_ASSIGN(ClassLinker);
};
} // namespace art
#endif // ART_RUNTIME_CLASS_LINKER_H_