/*
* 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 <list>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "base/enums.h"
#include "base/locks.h"
#include "base/macros.h"
#include "dex/class_accessor.h"
#include "dex/dex_cache_resolved_classes.h"
#include "dex/dex_file_types.h"
#include "gc_root.h"
#include "handle.h"
#include "jni.h"
#include "mirror/class.h"
#include "verifier/verifier_enums.h"
namespace art {
namespace dex {
struct ClassDef;
struct MethodHandleItem;
} // namespace dex
namespace gc {
namespace space {
class ImageSpace;
} // namespace space
} // namespace gc
namespace linker {
struct CompilationHelper;
class ImageWriter;
class OatWriter;
} // namespace linker
namespace mirror {
class ClassLoader;
class DexCache;
class DexCachePointerArray;
class DexCacheMethodHandlesTest_Open_Test;
class DexCacheTest_Open_Test;
class IfTable;
class MethodHandle;
class MethodHandlesLookup;
class MethodType;
template<class T> class ObjectArray;
class StackTraceElement;
template <typename T> struct NativeDexCachePair;
using MethodDexCachePair = NativeDexCachePair<ArtMethod>;
using MethodDexCacheType = std::atomic<MethodDexCachePair>;
} // namespace mirror
class ArtField;
class ArtMethod;
class ClassHierarchyAnalysis;
enum class ClassRoot : uint32_t;
class ClassTable;
class DexFile;
template<class T> class Handle;
class ImtConflictTable;
template<typename T> class LengthPrefixedArray;
template<class T> class MutableHandle;
class InternTable;
class LinearAlloc;
class OatFile;
template<class T> class ObjectLock;
class Runtime;
class ScopedObjectAccessAlreadyRunnable;
template<size_t kNumReferences> class PACKED(4) StackHandleScope;
class Thread;
enum VisitRootFlags : uint8_t;
class ClassVisitor {
public:
virtual ~ClassVisitor() {}
// Return true to continue visiting.
virtual bool operator()(ObjPtr<mirror::Class> klass) = 0;
};
class ClassLoaderVisitor {
public:
virtual ~ClassLoaderVisitor() {}
virtual void Visit(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_) = 0;
};
class AllocatorVisitor {
public:
virtual ~AllocatorVisitor() {}
// Return true to continue visiting.
virtual bool Visit(LinearAlloc* alloc)
REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_) = 0;
};
class ClassLinker {
public:
static constexpr bool kAppImageMayContainStrings = true;
explicit ClassLinker(InternTable* intern_table,
bool fast_class_not_found_exceptions = true);
virtual ~ClassLinker();
// Initialize class linker by bootstraping from dex files.
bool InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path,
std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Initialize class linker from one or more boot images.
bool InitFromBootImage(std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Add boot class path dex files that were not included in the boot image.
// ClassLinker takes ownership of these dex files.
void AddExtraBootDexFiles(Thread* self,
std::vector<std::unique_ptr<const DexFile>>&& additional_dex_files)
REQUIRES_SHARED(Locks::mutator_lock_);
// Add an image space to the class linker, may fix up classloader fields and dex cache fields.
// The dex files that were newly opened for the space are placed in the out argument
// out_dex_files. Returns true if the operation succeeded.
// The space must be already added to the heap before calling AddImageSpace since we need to
// properly handle read barriers and object marking.
bool AddImageSpace(gc::space::ImageSpace* space,
Handle<mirror::ClassLoader> class_loader,
jobjectArray dex_elements,
const char* dex_location,
std::vector<std::unique_ptr<const DexFile>>* out_dex_files,
std::string* error_msg)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
bool OpenImageDexFiles(gc::space::ImageSpace* space,
std::vector<std::unique_ptr<const DexFile>>* out_dex_files,
std::string* error_msg)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Finds a class by its descriptor, loading it if necessary.
// If class_loader is null, searches boot_class_path_.
ObjPtr<mirror::Class> FindClass(Thread* self,
const char* descriptor,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Finds a class by its descriptor using the "system" class loader, ie by searching the
// boot_class_path_.
ObjPtr<mirror::Class> FindSystemClass(Thread* self, const char* descriptor)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_) {
return FindClass(self, descriptor, ScopedNullHandle<mirror::ClassLoader>());
}
// Finds the array class given for the element class.
ObjPtr<mirror::Class> FindArrayClass(Thread* self, ObjPtr<mirror::Class> element_class)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_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
ObjPtr<mirror::Class> DefineClass(Thread* self,
const char* descriptor,
size_t hash,
Handle<mirror::ClassLoader> class_loader,
const DexFile& dex_file,
const dex::ClassDef& dex_class_def)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Finds a class by its descriptor, returning null if it isn't wasn't loaded
// by the given 'class_loader'.
ObjPtr<mirror::Class> LookupClass(Thread* self,
const char* descriptor,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Finds all the classes with the given descriptor, regardless of ClassLoader.
void LookupClasses(const char* descriptor, std::vector<ObjPtr<mirror::Class>>& classes)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::Class> LookupPrimitiveClass(char type) REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::Class> FindPrimitiveClass(char type) REQUIRES_SHARED(Locks::mutator_lock_);
void DumpForSigQuit(std::ostream& os) REQUIRES(!Locks::classlinker_classes_lock_);
size_t NumLoadedClasses()
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a String with the given index from the DexFile associated with the given `referrer`,
// storing the result in the DexCache. The `referrer` is used to identify the target DexCache
// to use for resolution.
ObjPtr<mirror::String> ResolveString(dex::StringIndex string_idx,
ArtField* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::String> ResolveString(dex::StringIndex string_idx,
ArtMethod* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a String with the given index from the DexFile associated with the given DexCache,
// storing the result in the DexCache.
ObjPtr<mirror::String> ResolveString(dex::StringIndex string_idx,
Handle<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
// Find a String with the given index from the DexFile associated with the given DexCache,
// storing the result in the DexCache if found. Return null if not found.
ObjPtr<mirror::String> LookupString(dex::StringIndex string_idx,
ObjPtr<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a Type with the given index from the DexFile associated with the given `referrer`,
// storing the result in the DexCache. The `referrer` is used to identify the target DexCache
// and ClassLoader to use for resolution.
ObjPtr<mirror::Class> ResolveType(dex::TypeIndex type_idx, ObjPtr<mirror::Class> referrer)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ObjPtr<mirror::Class> ResolveType(dex::TypeIndex type_idx, ArtField* referrer)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ObjPtr<mirror::Class> ResolveType(dex::TypeIndex type_idx, ArtMethod* referrer)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Resolve a type with the given index from the DexFile associated with the given DexCache
// and ClassLoader, 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 DexFile.
ObjPtr<mirror::Class> ResolveType(dex::TypeIndex type_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Look up a resolved type with the given index from the DexFile associated with the given
// `referrer`, storing the result in the DexCache. The `referrer` is used to identify the
// target DexCache and ClassLoader to use for lookup.
ObjPtr<mirror::Class> LookupResolvedType(dex::TypeIndex type_idx,
ObjPtr<mirror::Class> referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::Class> LookupResolvedType(dex::TypeIndex type_idx, ArtField* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::Class> LookupResolvedType(dex::TypeIndex type_idx, ArtMethod* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
// Look up a resolved type with the given index from the DexFile associated with the given
// DexCache and ClassLoader. The ClassLoader is used to search for the type, since it may
// be referenced from but not contained within the DexFile.
ObjPtr<mirror::Class> LookupResolvedType(dex::TypeIndex type_idx,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
// Determine whether a dex cache result should be trusted, or an IncompatibleClassChangeError
// check and IllegalAccessError check should be performed even after a hit.
enum class ResolveMode { // private.
kNoChecks,
kCheckICCEAndIAE
};
// Look up a previously resolved method with the given index.
ArtMethod* LookupResolvedMethod(uint32_t method_idx,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
// Find a method with the given index from class `klass`, and update the dex cache.
ArtMethod* FindResolvedMethod(ObjPtr<mirror::Class> klass,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader,
uint32_t method_idx)
REQUIRES_SHARED(Locks::mutator_lock_);
// Find a method using the wrong lookup mechanism. If `klass` is an interface,
// search for a class method. If it is a class, search for an interface method.
// This is useful when throwing IncompatibleClassChangeError.
ArtMethod* FindIncompatibleMethod(ObjPtr<mirror::Class> klass,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader,
uint32_t method_idx)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a method with a given ID from the DexFile associated with the given DexCache
// and ClassLoader, 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.
template <ResolveMode kResolveMode>
ArtMethod* ResolveMethod(uint32_t method_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader,
ArtMethod* referrer,
InvokeType type)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
template <InvokeType type, ResolveMode kResolveMode>
ArtMethod* GetResolvedMethod(uint32_t method_idx, ArtMethod* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
template <ResolveMode kResolveMode>
ArtMethod* ResolveMethod(Thread* self, uint32_t method_idx, ArtMethod* referrer, InvokeType type)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ArtMethod* ResolveMethodWithoutInvokeType(uint32_t method_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ArtField* LookupResolvedField(uint32_t field_idx, ArtMethod* referrer, bool is_static)
REQUIRES_SHARED(Locks::mutator_lock_);
ArtField* ResolveField(uint32_t field_idx, ArtMethod* referrer, bool is_static)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Resolve a field with a given ID from the DexFile associated with the given DexCache
// and ClassLoader, 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.
ArtField* ResolveField(uint32_t field_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader,
bool is_static)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Resolve a field with a given ID from the DexFile associated with the given DexCache
// and ClassLoader, 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.
ArtField* ResolveFieldJLS(uint32_t field_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Find a field with a given ID from the DexFile associated with the given DexCache
// and ClassLoader, storing the result in DexCache. The declaring class is assumed
// to have been already resolved into `klass`. The `is_static` argument is used to
// determine if we are resolving a static or non-static field.
ArtField* FindResolvedField(ObjPtr<mirror::Class> klass,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader,
uint32_t field_idx,
bool is_static)
REQUIRES_SHARED(Locks::mutator_lock_);
// Find a field with a given ID from the DexFile associated with the given DexCache
// and ClassLoader, storing the result in DexCache. The declaring class is assumed
// to have been already resolved into `klass`. No is_static argument is provided
// so that Java field resolution semantics are followed.
ArtField* FindResolvedFieldJLS(ObjPtr<mirror::Class> klass,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader,
uint32_t field_idx)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a method type with a given ID from the DexFile associated with a given DexCache
// and ClassLoader, storing the result in the DexCache.
ObjPtr<mirror::MethodType> ResolveMethodType(Thread* self,
dex::ProtoIndex proto_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ObjPtr<mirror::MethodType> ResolveMethodType(Thread* self,
dex::ProtoIndex proto_idx,
ArtMethod* referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
// Resolve a method handle with a given ID from the DexFile. The
// result is not cached in the DexCache as the instance will only be
// used once in most circumstances.
ObjPtr<mirror::MethodHandle> ResolveMethodHandle(Thread* self,
uint32_t method_handle_idx,
ArtMethod* referrer)
REQUIRES_SHARED(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)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Initializes classes that have instances in the image but that have
// <clinit> methods so they could not be initialized by the compiler.
void RunRootClinits(Thread* self)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Directly register an already existing dex cache. RegisterDexFile should be preferred since that
// reduplicates DexCaches when possible. The DexCache given to this function must already be fully
// initialized and not already registered.
void RegisterExistingDexCache(ObjPtr<mirror::DexCache> cache,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::DexCache> RegisterDexFile(const DexFile& dex_file,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
const std::vector<const DexFile*>& GetBootClassPath() {
return boot_class_path_;
}
void VisitClasses(ClassVisitor* visitor)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(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)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
void VisitClassRoots(RootVisitor* visitor, VisitRootFlags flags)
REQUIRES(!Locks::classlinker_classes_lock_, !Locks::trace_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
void VisitRoots(RootVisitor* visitor, VisitRootFlags flags)
REQUIRES(!Locks::dex_lock_, !Locks::classlinker_classes_lock_, !Locks::trace_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
bool IsDexFileRegistered(Thread* self, const DexFile& dex_file)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::DexCache> FindDexCache(Thread* self, const DexFile& dex_file)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
ClassTable* FindClassTable(Thread* self, ObjPtr<mirror::DexCache> dex_cache)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
LengthPrefixedArray<ArtField>* AllocArtFieldArray(Thread* self,
LinearAlloc* allocator,
size_t length);
LengthPrefixedArray<ArtMethod>* AllocArtMethodArray(Thread* self,
LinearAlloc* allocator,
size_t length);
ObjPtr<mirror::PointerArray> AllocPointerArray(Thread* self, size_t length)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
ObjPtr<mirror::IfTable> AllocIfTable(Thread* self, size_t ifcount)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
ObjPtr<mirror::ObjectArray<mirror::StackTraceElement>> AllocStackTraceElementArray(Thread* self,
size_t length)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
verifier::FailureKind VerifyClass(
Thread* self,
Handle<mirror::Class> klass,
verifier::HardFailLogMode log_level = verifier::HardFailLogMode::kLogNone)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
bool VerifyClassUsingOatFile(const DexFile& dex_file,
ObjPtr<mirror::Class> klass,
ClassStatus& oat_file_class_status)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
void ResolveClassExceptionHandlerTypes(Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
void ResolveMethodExceptionHandlerTypes(ArtMethod* klass)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
ObjPtr<mirror::Class> CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa,
jstring name,
jobjectArray interfaces,
jobject loader,
jobjectArray methods,
jobjectArray throws)
REQUIRES_SHARED(Locks::mutator_lock_);
// Get the oat code for a method when its class isn't yet initialized.
const void* GetQuickOatCodeFor(ArtMethod* method)
REQUIRES_SHARED(Locks::mutator_lock_);
pid_t GetClassesLockOwner(); // For SignalCatcher.
pid_t GetDexLockOwner(); // For SignalCatcher.
// 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;
// Is the given entry point the JNI dlsym lookup stub?
bool IsJniDlsymLookupStub(const void* entry_point) const;
const void* GetQuickToInterpreterBridgeTrampoline() const {
return quick_to_interpreter_bridge_trampoline_;
}
InternTable* GetInternTable() const {
return intern_table_;
}
// Set the entrypoints up for method to the enter the interpreter.
void SetEntryPointsToInterpreter(ArtMethod* method) const
REQUIRES_SHARED(Locks::mutator_lock_);
// Set the entrypoints up for an obsolete method.
void SetEntryPointsForObsoleteMethod(ArtMethod* method) const
REQUIRES_SHARED(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.
ObjPtr<mirror::Class> InsertClass(const char* descriptor,
ObjPtr<mirror::Class> klass,
size_t hash)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Add an oat file with .bss GC roots to be visited again at the end of GC
// for collector types that need it.
void WriteBarrierForBootOatFileBssRoots(const OatFile* oat_file)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
template <ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
ObjPtr<mirror::ObjectArray<mirror::Class>> GetClassRoots() REQUIRES_SHARED(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()
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Creates a GlobalRef PathClassLoader or DelegateLastClassLoader (specified by loader_class)
// that can be used to load classes from the given dex files. The parent of the class loader
// will be set to `parent_loader`. If `parent_loader` is null the parent will be
// the boot class loader.
// If class_loader points to a different class than PathClassLoader or DelegateLastClassLoader
// this method will abort.
// Note: the objects are not completely set up. Do not use this outside of tests and the compiler.
jobject CreateWellKnownClassLoader(Thread* self,
const std::vector<const DexFile*>& dex_files,
jclass loader_class,
jobject parent_loader,
jobject shared_libraries = nullptr)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Calls CreateWellKnownClassLoader(self,
// dex_files,
// WellKnownClasses::dalvik_system_PathClassLoader,
// nullptr)
jobject CreatePathClassLoader(Thread* self, const std::vector<const DexFile*>& dex_files)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Non-GlobalRef version of CreateWellKnownClassLoader
ObjPtr<mirror::ClassLoader> CreateWellKnownClassLoader(
Thread* self,
const std::vector<const DexFile*>& dex_files,
Handle<mirror::Class> loader_class,
Handle<mirror::ClassLoader> parent_loader,
Handle<mirror::ObjectArray<mirror::ClassLoader>> shared_libraries)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
PointerSize GetImagePointerSize() const {
return image_pointer_size_;
}
// Used by image writer for checking.
bool ClassInClassTable(ObjPtr<mirror::Class> klass)
REQUIRES(Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Clear the ArrayClass cache. This is necessary when cleaning up for the image, as the cache
// entries are roots, but potentially not image classes.
void DropFindArrayClassCache() REQUIRES_SHARED(Locks::mutator_lock_);
// Clean up class loaders, this needs to happen after JNI weak globals are cleared.
void CleanupClassLoaders()
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Unlike GetOrCreateAllocatorForClassLoader, GetAllocatorForClassLoader asserts that the
// allocator for this class loader is already created.
LinearAlloc* GetAllocatorForClassLoader(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
// Return the linear alloc for a class loader if it is already allocated, otherwise allocate and
// set it. TODO: Consider using a lock other than classlinker_classes_lock_.
LinearAlloc* GetOrCreateAllocatorForClassLoader(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// May be called with null class_loader due to legacy code. b/27954959
void InsertDexFileInToClassLoader(ObjPtr<mirror::Object> dex_file,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
static bool ShouldUseInterpreterEntrypoint(ArtMethod* method, const void* quick_code)
REQUIRES_SHARED(Locks::mutator_lock_);
std::set<DexCacheResolvedClasses> GetResolvedClasses(bool ignore_boot_classes)
REQUIRES(!Locks::dex_lock_);
static bool IsBootClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
ArtMethod* AddMethodToConflictTable(ObjPtr<mirror::Class> klass,
ArtMethod* conflict_method,
ArtMethod* interface_method,
ArtMethod* method,
bool force_new_conflict_method)
REQUIRES_SHARED(Locks::mutator_lock_);
// Create a conflict table with a specified capacity.
ImtConflictTable* CreateImtConflictTable(size_t count, LinearAlloc* linear_alloc);
// Static version for when the class linker is not yet created.
static ImtConflictTable* CreateImtConflictTable(size_t count,
LinearAlloc* linear_alloc,
PointerSize pointer_size);
// Create the IMT and conflict tables for a class.
void FillIMTAndConflictTables(ObjPtr<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_);
// Visit all of the class tables. This is used by dex2oat to allow pruning dex caches.
template <class Visitor>
void VisitClassTables(const Visitor& visitor)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Visit all of the allocators that belong to classloaders except boot classloader.
// This is used by 616-cha-unloading test to confirm memory reuse.
void VisitAllocators(AllocatorVisitor* visitor) const
REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_);
// Throw the class initialization failure recorded when first trying to initialize the given
// class.
void ThrowEarlierClassFailure(ObjPtr<mirror::Class> c,
bool wrap_in_no_class_def = false,
bool log = false)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Get the actual holding class for a copied method. Pretty slow, don't call often.
ObjPtr<mirror::Class> GetHoldingClassOfCopiedMethod(ArtMethod* method)
REQUIRES_SHARED(Locks::mutator_lock_);
// Returns null if not found.
// This returns a pointer to the class-table, without requiring any locking - including the
// boot class-table. It is the caller's responsibility to access this under lock, if required.
ClassTable* ClassTableForClassLoader(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
NO_THREAD_SAFETY_ANALYSIS;
void AppendToBootClassPath(Thread* self, const DexFile& dex_file)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Visit all of the class loaders in the class linker.
void VisitClassLoaders(ClassLoaderVisitor* visitor) const
REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_);
// Checks that a class and its superclass from another class loader have the same virtual methods.
bool ValidateSuperClassDescriptors(Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
ClassHierarchyAnalysis* GetClassHierarchyAnalysis() {
return cha_.get();
}
struct DexCacheData {
// Construct an invalid data object.
DexCacheData()
: weak_root(nullptr),
dex_file(nullptr),
class_table(nullptr) { }
// Check if the data is valid.
bool IsValid() const {
return dex_file != nullptr;
}
// Weak root to the DexCache. Note: Do not decode this unnecessarily or else class unloading may
// not work properly.
jweak weak_root;
// The following field caches the DexCache's field here to avoid unnecessary jweak decode that
// triggers read barriers (and marks them alive unnecessarily and messes with class unloading.)
const DexFile* dex_file;
// Identify the associated class loader's class table. This is used to make sure that
// the Java call to native DexCache.setResolvedType() inserts the resolved type in that
// class table. It is also used to make sure we don't register the same dex cache with
// multiple class loaders.
ClassTable* class_table;
};
protected:
virtual bool InitializeClass(Thread* self,
Handle<mirror::Class> klass,
bool can_run_clinit,
bool can_init_parents)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
virtual verifier::FailureKind PerformClassVerification(Thread* self,
Handle<mirror::Class> klass,
verifier::HardFailLogMode log_level,
std::string* error_msg)
REQUIRES_SHARED(Locks::mutator_lock_);
private:
class LinkInterfaceMethodsHelper;
struct ClassLoaderData {
jweak weak_root; // Weak root to enable class unloading.
ClassTable* class_table;
LinearAlloc* allocator;
};
// Ensures that the supertype of 'klass' ('supertype') is verified. Returns false and throws
// appropriate exceptions if verification failed hard. Returns true for successful verification or
// soft-failures.
bool AttemptSupertypeVerification(Thread* self,
Handle<mirror::Class> klass,
Handle<mirror::Class> supertype)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
void DeleteClassLoader(Thread* self, const ClassLoaderData& data, bool cleanup_cha)
REQUIRES_SHARED(Locks::mutator_lock_);
void VisitClassesInternal(ClassVisitor* visitor)
REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_);
// Returns the number of zygote and image classes.
size_t NumZygoteClasses() const
REQUIRES(Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Returns the number of non zygote nor image classes.
size_t NumNonZygoteClasses() const
REQUIRES(Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
void FinishInit(Thread* self)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// For early bootstrapping by Init.
// If we do not allow moving classes (`art::kMovingClass` is false) or if
// parameter `kMovable` is false (or both), the class object is allocated in
// the non-moving space.
template <bool kMovable = true>
ObjPtr<mirror::Class> AllocClass(Thread* self,
ObjPtr<mirror::Class> java_lang_Class,
uint32_t class_size)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
// Alloc* convenience functions to avoid needing to pass in ObjPtr<mirror::Class>
// values that are known to the ClassLinker such as classes corresponding to
// ClassRoot::kObjectArrayClass and ClassRoot::kJavaLangString etc.
ObjPtr<mirror::Class> AllocClass(Thread* self, uint32_t class_size)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
// Allocate a primitive array class.
ObjPtr<mirror::Class> AllocPrimitiveArrayClass(Thread* self,
ObjPtr<mirror::Class> java_lang_Class)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
ObjPtr<mirror::DexCache> AllocDexCache(/*out*/ ObjPtr<mirror::String>* out_location,
Thread* self,
const DexFile& dex_file)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
// Used for tests and AppendToBootClassPath.
ObjPtr<mirror::DexCache> AllocAndInitializeDexCache(Thread* self,
const DexFile& dex_file,
LinearAlloc* linear_alloc)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_)
REQUIRES(!Roles::uninterruptible_);
ObjPtr<mirror::Class> CreatePrimitiveClass(Thread* self, Primitive::Type type)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
ObjPtr<mirror::Class> CreateArrayClass(Thread* self,
const char* descriptor,
size_t hash,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
void AppendToBootClassPath(const DexFile& dex_file, ObjPtr<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_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 dex::ClassDef& dex_class_def);
// Setup the classloader, class def index, type idx so that we can insert this class in the class
// table.
void SetupClass(const DexFile& dex_file,
const dex::ClassDef& dex_class_def,
Handle<mirror::Class> klass,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
void LoadClass(Thread* self,
const DexFile& dex_file,
const dex::ClassDef& dex_class_def,
Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
void LoadField(const ClassAccessor::Field& field, Handle<mirror::Class> klass, ArtField* dst)
REQUIRES_SHARED(Locks::mutator_lock_);
void LoadMethod(const DexFile& dex_file,
const ClassAccessor::Method& method,
Handle<mirror::Class> klass,
ArtMethod* dst)
REQUIRES_SHARED(Locks::mutator_lock_);
void FixupStaticTrampolines(ObjPtr<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_);
// Finds a class in a Path- or DexClassLoader, loading it if necessary without using JNI. Hash
// function is supposed to be ComputeModifiedUtf8Hash(descriptor). Returns true if the
// class-loader chain could be handled, false otherwise, i.e., a non-supported class-loader
// was encountered while walking the parent chain (currently only BootClassLoader and
// PathClassLoader are supported).
bool FindClassInBaseDexClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
Thread* self,
const char* descriptor,
size_t hash,
Handle<mirror::ClassLoader> class_loader,
/*out*/ ObjPtr<mirror::Class>* result)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
bool FindClassInSharedLibraries(ScopedObjectAccessAlreadyRunnable& soa,
Thread* self,
const char* descriptor,
size_t hash,
Handle<mirror::ClassLoader> class_loader,
/*out*/ ObjPtr<mirror::Class>* result)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Finds the class in the classpath of the given class loader. It only searches the class loader
// dex files and does not recurse into its parent.
// The method checks that the provided class loader is either a PathClassLoader or a
// DexClassLoader.
// If the class is found the method returns the resolved class. Otherwise it returns null.
ObjPtr<mirror::Class> FindClassInBaseDexClassLoaderClassPath(
ScopedObjectAccessAlreadyRunnable& soa,
const char* descriptor,
size_t hash,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Finds the class in the boot class loader.
// If the class is found the method returns the resolved class. Otherwise it returns null.
ObjPtr<mirror::Class> FindClassInBootClassLoaderClassPath(Thread* self,
const char* descriptor,
size_t hash)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
// Implementation of LookupResolvedType() called when the type was not found in the dex cache.
ObjPtr<mirror::Class> DoLookupResolvedType(dex::TypeIndex type_idx,
ObjPtr<mirror::Class> referrer)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::Class> DoLookupResolvedType(dex::TypeIndex type_idx,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
// Implementation of ResolveString() called when the string was not found in the dex cache.
ObjPtr<mirror::String> DoResolveString(dex::StringIndex string_idx,
ObjPtr<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::String> DoResolveString(dex::StringIndex string_idx,
Handle<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
// Implementation of LookupString() called when the string was not found in the dex cache.
ObjPtr<mirror::String> DoLookupString(dex::StringIndex string_idx,
ObjPtr<mirror::DexCache> dex_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
// Implementation of ResolveType() called when the type was not found in the dex cache.
template <typename T>
ObjPtr<mirror::Class> DoResolveType(dex::TypeIndex type_idx, T referrer)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
ObjPtr<mirror::Class> DoResolveType(dex::TypeIndex type_idx,
Handle<mirror::DexCache> dex_cache,
Handle<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_, !Roles::uninterruptible_);
// Finds a class by its descriptor, returning NULL if it isn't wasn't loaded
// by the given 'class_loader'. Uses the provided hash for the descriptor.
ObjPtr<mirror::Class> LookupClass(Thread* self,
const char* descriptor,
size_t hash,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::classlinker_classes_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Find a field by its field index.
ArtField* LookupResolvedField(uint32_t field_idx,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader,
bool is_static)
REQUIRES_SHARED(Locks::mutator_lock_);
void RegisterDexFileLocked(const DexFile& dex_file,
ObjPtr<mirror::DexCache> dex_cache,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
DexCacheData FindDexCacheDataLocked(const DexFile& dex_file)
REQUIRES(Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
static ObjPtr<mirror::DexCache> DecodeDexCache(Thread* self, const DexCacheData& data)
REQUIRES_SHARED(Locks::mutator_lock_);
// Called to ensure that the dex cache has been registered with the same class loader.
// If yes, returns the dex cache, otherwise throws InternalError and returns null.
ObjPtr<mirror::DexCache> EnsureSameClassLoader(Thread* self,
ObjPtr<mirror::DexCache> dex_cache,
const DexCacheData& data,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
bool InitializeDefaultInterfaceRecursive(Thread* self,
Handle<mirror::Class> klass,
bool can_run_clinit,
bool can_init_parents)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
bool WaitForInitializeClass(Handle<mirror::Class> klass,
Thread* self,
ObjectLock<mirror::Class>& lock);
bool IsSameDescriptorInDifferentClassContexts(Thread* self,
const char* descriptor,
Handle<mirror::ClassLoader> class_loader1,
Handle<mirror::ClassLoader> class_loader2)
REQUIRES_SHARED(Locks::mutator_lock_);
bool IsSameMethodSignatureInDifferentClassContexts(Thread* self,
ArtMethod* method,
ObjPtr<mirror::Class> klass1,
ObjPtr<mirror::Class> klass2)
REQUIRES_SHARED(Locks::mutator_lock_);
bool LinkClass(Thread* self,
const char* descriptor,
Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces,
MutableHandle<mirror::Class>* h_new_class_out)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::classlinker_classes_lock_);
bool LinkSuperClass(Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
bool LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
bool LinkMethods(Thread* self,
Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces,
bool* out_new_conflict,
ArtMethod** out_imt)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::MethodHandle> ResolveMethodHandleForField(
Thread* self,
const dex::MethodHandleItem& method_handle,
ArtMethod* referrer) REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::MethodHandle> ResolveMethodHandleForMethod(
Thread* self,
const dex::MethodHandleItem& method_handle,
ArtMethod* referrer) REQUIRES_SHARED(Locks::mutator_lock_);
// A wrapper class representing the result of a method translation used for linking methods and
// updating superclass default methods. For each method in a classes vtable there are 4 states it
// could be in:
// 1) No translation is necessary. In this case there is no MethodTranslation object for it. This
// is the standard case and is true when the method is not overridable by a default method,
// the class defines a concrete implementation of the method, the default method implementation
// remains the same, or an abstract method stayed abstract.
// 2) The method must be translated to a different default method. We note this with
// CreateTranslatedMethod.
// 3) The method must be replaced with a conflict method. This happens when a superclass
// implements an interface with a default method and this class implements an unrelated
// interface that also defines that default method. We note this with CreateConflictingMethod.
// 4) The method must be replaced with an abstract miranda method. This happens when a superclass
// implements an interface with a default method and this class implements a subinterface of
// the superclass's interface which declares the default method abstract. We note this with
// CreateAbstractMethod.
//
// When a method translation is unnecessary (case #1), we don't put it into the
// default_translation maps. So an instance of MethodTranslation must be in one of #2-#4.
class MethodTranslation {
public:
// This slot must become a default conflict method.
static MethodTranslation CreateConflictingMethod() {
return MethodTranslation(Type::kConflict, /*translation=*/nullptr);
}
// This slot must become an abstract method.
static MethodTranslation CreateAbstractMethod() {
return MethodTranslation(Type::kAbstract, /*translation=*/nullptr);
}
// Use the given method as the current value for this vtable slot during translation.
static MethodTranslation CreateTranslatedMethod(ArtMethod* new_method) {
return MethodTranslation(Type::kTranslation, new_method);
}
// Returns true if this is a method that must become a conflict method.
bool IsInConflict() const {
return type_ == Type::kConflict;
}
// Returns true if this is a method that must become an abstract method.
bool IsAbstract() const {
return type_ == Type::kAbstract;
}
// Returns true if this is a method that must become a different method.
bool IsTranslation() const {
return type_ == Type::kTranslation;
}
// Get the translated version of this method.
ArtMethod* GetTranslation() const {
DCHECK(IsTranslation());
DCHECK(translation_ != nullptr);
return translation_;
}
private:
enum class Type {
kTranslation,
kConflict,
kAbstract,
};
MethodTranslation(Type type, ArtMethod* translation)
: translation_(translation), type_(type) {}
ArtMethod* const translation_;
const Type type_;
};
// Links the virtual methods for the given class and records any default methods that will need to
// be updated later.
//
// Arguments:
// * self - The current thread.
// * klass - class, whose vtable will be filled in.
// * default_translations - Vtable index to new method map.
// Any vtable entries that need to be updated with new default methods
// are stored into the default_translations map. The default_translations
// map is keyed on the vtable index that needs to be updated. We use this
// map because if we override a default method with another default
// method we need to update the vtable to point to the new method.
// Unfortunately since we copy the ArtMethod* we cannot just do a simple
// scan, we therefore store the vtable index's that might need to be
// updated with the method they will turn into.
// TODO This whole default_translations thing is very dirty. There should be a better way.
bool LinkVirtualMethods(
Thread* self,
Handle<mirror::Class> klass,
/*out*/std::unordered_map<size_t, MethodTranslation>* default_translations)
REQUIRES_SHARED(Locks::mutator_lock_);
// Sets up the interface lookup table (IFTable) in the correct order to allow searching for
// default methods.
bool SetupInterfaceLookupTable(Thread* self,
Handle<mirror::Class> klass,
Handle<mirror::ObjectArray<mirror::Class>> interfaces)
REQUIRES_SHARED(Locks::mutator_lock_);
enum class DefaultMethodSearchResult {
kDefaultFound,
kAbstractFound,
kDefaultConflict
};
// Find the default method implementation for 'interface_method' in 'klass', if one exists.
//
// Arguments:
// * self - The current thread.
// * target_method - The method we are trying to find a default implementation for.
// * klass - The class we are searching for a definition of target_method.
// * out_default_method - The pointer we will store the found default method to on success.
//
// Return value:
// * kDefaultFound - There were no conflicting method implementations found in the class while
// searching for target_method. The default method implementation is stored into
// out_default_method.
// * kAbstractFound - There were no conflicting method implementations found in the class while
// searching for target_method but no default implementation was found either.
// out_default_method is set to null and the method should be considered not
// implemented.
// * kDefaultConflict - Conflicting method implementations were found when searching for
// target_method. The value of *out_default_method is null.
DefaultMethodSearchResult FindDefaultMethodImplementation(
Thread* self,
ArtMethod* target_method,
Handle<mirror::Class> klass,
/*out*/ArtMethod** out_default_method) const
REQUIRES_SHARED(Locks::mutator_lock_);
// Sets the imt entries and fixes up the vtable for the given class by linking all the interface
// methods. See LinkVirtualMethods for an explanation of what default_translations is.
bool LinkInterfaceMethods(
Thread* self,
Handle<mirror::Class> klass,
const std::unordered_map<size_t, MethodTranslation>& default_translations,
bool* out_new_conflict,
ArtMethod** out_imt)
REQUIRES_SHARED(Locks::mutator_lock_);
bool LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size)
REQUIRES_SHARED(Locks::mutator_lock_);
bool LinkInstanceFields(Thread* self, Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
bool LinkFields(Thread* self, Handle<mirror::Class> klass, bool is_static, size_t* class_size)
REQUIRES_SHARED(Locks::mutator_lock_);
void CreateReferenceInstanceOffsets(Handle<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
void CheckProxyConstructor(ArtMethod* constructor) const
REQUIRES_SHARED(Locks::mutator_lock_);
void CheckProxyMethod(ArtMethod* method, ArtMethod* prototype) const
REQUIRES_SHARED(Locks::mutator_lock_);
size_t GetDexCacheCount() REQUIRES_SHARED(Locks::mutator_lock_, Locks::dex_lock_) {
return dex_caches_.size();
}
const std::list<DexCacheData>& GetDexCachesData()
REQUIRES_SHARED(Locks::mutator_lock_, Locks::dex_lock_) {
return dex_caches_;
}
void CreateProxyConstructor(Handle<mirror::Class> klass, ArtMethod* out)
REQUIRES_SHARED(Locks::mutator_lock_);
void CreateProxyMethod(Handle<mirror::Class> klass, ArtMethod* prototype, ArtMethod* out)
REQUIRES_SHARED(Locks::mutator_lock_);
// Register a class loader and create its class table and allocator. Should not be called if
// these are already created.
void RegisterClassLoader(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(Locks::classlinker_classes_lock_);
// Insert a new class table if not found.
ClassTable* InsertClassTableForClassLoader(ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(Locks::classlinker_classes_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.
ObjPtr<mirror::Class> EnsureResolved(Thread* self,
const char* descriptor,
ObjPtr<mirror::Class> klass)
WARN_UNUSED
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::dex_lock_);
void FixupTemporaryDeclaringClass(ObjPtr<mirror::Class> temp_class,
ObjPtr<mirror::Class> new_class)
REQUIRES_SHARED(Locks::mutator_lock_);
void SetClassRoot(ClassRoot class_root, ObjPtr<mirror::Class> klass)
REQUIRES_SHARED(Locks::mutator_lock_);
// Allocate primitive array class for primitive with class root
// `primitive_class_root`, and associate it to class root
// `primitive_array_class_root`.
//
// Also check this class returned when searching system classes for
// `descriptor` matches the allocated class.
void AllocAndSetPrimitiveArrayClassRoot(Thread* self,
ObjPtr<mirror::Class> java_lang_Class,
ClassRoot primitive_array_class_root,
ClassRoot primitive_class_root,
const char* descriptor)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Roles::uninterruptible_);
// Return the quick generic JNI stub for testing.
const void* GetRuntimeQuickGenericJniStub() const;
bool CanWeInitializeClass(ObjPtr<mirror::Class> klass,
bool can_init_statics,
bool can_init_parents)
REQUIRES_SHARED(Locks::mutator_lock_);
void UpdateClassMethods(ObjPtr<mirror::Class> klass,
LengthPrefixedArray<ArtMethod>* new_methods)
REQUIRES_SHARED(Locks::mutator_lock_)
REQUIRES(!Locks::classlinker_classes_lock_);
// Check that c1 == FindSystemClass(self, descriptor). Abort with class dumps otherwise.
void CheckSystemClass(Thread* self, Handle<mirror::Class> c1, const char* descriptor)
REQUIRES(!Locks::dex_lock_)
REQUIRES_SHARED(Locks::mutator_lock_);
// Allocate method arrays for interfaces.
bool AllocateIfTableMethodArrays(Thread* self,
Handle<mirror::Class> klass,
Handle<mirror::IfTable> iftable)
REQUIRES_SHARED(Locks::mutator_lock_);
// Sets imt_ref appropriately for LinkInterfaceMethods.
// If there is no method in the imt location of imt_ref it will store the given method there.
// Otherwise it will set the conflict method which will figure out which method to use during
// runtime.
void SetIMTRef(ArtMethod* unimplemented_method,
ArtMethod* imt_conflict_method,
ArtMethod* current_method,
/*out*/bool* new_conflict,
/*out*/ArtMethod** imt_ref) REQUIRES_SHARED(Locks::mutator_lock_);
void FillIMTFromIfTable(ObjPtr<mirror::IfTable> if_table,
ArtMethod* unimplemented_method,
ArtMethod* imt_conflict_method,
ObjPtr<mirror::Class> klass,
bool create_conflict_tables,
bool ignore_copied_methods,
/*out*/bool* new_conflict,
/*out*/ArtMethod** imt) REQUIRES_SHARED(Locks::mutator_lock_);
void FillImtFromSuperClass(Handle<mirror::Class> klass,
ArtMethod* unimplemented_method,
ArtMethod* imt_conflict_method,
bool* new_conflict,
ArtMethod** imt) REQUIRES_SHARED(Locks::mutator_lock_);
// Check invoke type against the referenced class. Throws IncompatibleClassChangeError
// (if `kThrowOnError`) and returns true on mismatch (kInterface on a non-interface class,
// kVirtual on interface, kDefault on interface for dex files not supporting default methods),
// otherwise returns false.
template <bool kThrowOnError, typename ClassGetter>
static bool CheckInvokeClassMismatch(ObjPtr<mirror::DexCache> dex_cache,
InvokeType type,
ClassGetter class_getter)
REQUIRES_SHARED(Locks::mutator_lock_);
// Helper that feeds the above function with `ClassGetter` doing `LookupResolvedType()`.
template <bool kThrow>
bool CheckInvokeClassMismatch(ObjPtr<mirror::DexCache> dex_cache,
InvokeType type,
uint32_t method_idx,
ObjPtr<mirror::ClassLoader> class_loader)
REQUIRES_SHARED(Locks::mutator_lock_);
ObjPtr<mirror::IfTable> GetArrayIfTable() REQUIRES_SHARED(Locks::mutator_lock_);
std::vector<const DexFile*> boot_class_path_;
std::vector<std::unique_ptr<const DexFile>> boot_dex_files_;
// JNI weak globals and side data to allow dex caches to get unloaded. We lazily delete weak
// globals when we register new dex files.
std::list<DexCacheData> dex_caches_ GUARDED_BY(Locks::dex_lock_);
// This contains the class loaders which have class tables. It is populated by
// InsertClassTableForClassLoader.
std::list<ClassLoaderData> class_loaders_
GUARDED_BY(Locks::classlinker_classes_lock_);
// Boot class path table. Since the class loader for this is null.
std::unique_ptr<ClassTable> boot_class_table_ GUARDED_BY(Locks::classlinker_classes_lock_);
// New class roots, only used by CMS since the GC needs to mark these in the pause.
std::vector<GcRoot<mirror::Class>> new_class_roots_ GUARDED_BY(Locks::classlinker_classes_lock_);
// Boot image oat files with new .bss GC roots to be visited in the pause by CMS.
std::vector<const OatFile*> new_bss_roots_boot_oat_files_
GUARDED_BY(Locks::classlinker_classes_lock_);
// 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_;
// 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_roots_ GUARDED_BY(Locks::classlinker_classes_lock_);
InternTable* intern_table_;
const bool fast_class_not_found_exceptions_;
// 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.
PointerSize image_pointer_size_;
std::unique_ptr<ClassHierarchyAnalysis> cha_;
class FindVirtualMethodHolderVisitor;
friend class AppImageLoadingHelper;
friend class ImageDumper; // for DexLock
friend struct linker::CompilationHelper; // For Compile in ImageTest.
friend class linker::ImageWriter; // for GetClassRoots
friend class JniCompilerTest; // for GetRuntimeQuickGenericJniStub
friend class JniInternalTest; // for GetRuntimeQuickGenericJniStub
friend class VMClassLoader; // for LookupClass and FindClassInBaseDexClassLoader.
ART_FRIEND_TEST(ClassLinkerTest, RegisterDexFileName); // for DexLock, and RegisterDexFileLocked
ART_FRIEND_TEST(mirror::DexCacheMethodHandlesTest, Open); // for AllocDexCache
ART_FRIEND_TEST(mirror::DexCacheTest, Open); // for AllocDexCache
DISALLOW_COPY_AND_ASSIGN(ClassLinker);
};
class ClassLoadCallback {
public:
virtual ~ClassLoadCallback() {}
// If set we will replace initial_class_def & initial_dex_file with the final versions. The
// callback author is responsible for ensuring these are allocated in such a way they can be
// cleaned up if another transformation occurs. Note that both must be set or null/unchanged on
// return.
// Note: the class may be temporary, in which case a following ClassPrepare event will be a
// different object. It is the listener's responsibility to handle this.
// Note: This callback is rarely useful so a default implementation has been given that does
// nothing.
virtual void ClassPreDefine(const char* descriptor ATTRIBUTE_UNUSED,
Handle<mirror::Class> klass ATTRIBUTE_UNUSED,
Handle<mirror::ClassLoader> class_loader ATTRIBUTE_UNUSED,
const DexFile& initial_dex_file ATTRIBUTE_UNUSED,
const dex::ClassDef& initial_class_def ATTRIBUTE_UNUSED,
/*out*/DexFile const** final_dex_file ATTRIBUTE_UNUSED,
/*out*/dex::ClassDef const** final_class_def ATTRIBUTE_UNUSED)
REQUIRES_SHARED(Locks::mutator_lock_) {}
// A class has been loaded.
// Note: the class may be temporary, in which case a following ClassPrepare event will be a
// different object. It is the listener's responsibility to handle this.
virtual void ClassLoad(Handle<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_) = 0;
// A class has been prepared, i.e., resolved. As the ClassLoad event might have been for a
// temporary class, provide both the former and the current class.
virtual void ClassPrepare(Handle<mirror::Class> temp_klass,
Handle<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_) = 0;
};
} // namespace art
#endif // ART_RUNTIME_CLASS_LINKER_H_