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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_SRC_RUNTIME_SUPPORT_H_
#define ART_SRC_RUNTIME_SUPPORT_H_
#include "class_linker.h"
#include "common_throws.h"
#include "dex_file.h"
#include "indirect_reference_table.h"
#include "invoke_type.h"
#include "jni_internal.h"
#include "object.h"
#include "object_utils.h"
#include "thread.h"
#include "verifier/method_verifier.h"
extern "C" void art_proxy_invoke_handler();
extern "C" void art_work_around_app_jni_bugs();
extern "C" double art_l2d(int64_t l);
extern "C" float art_l2f(int64_t l);
extern "C" int64_t art_d2l(double d);
extern "C" int32_t art_d2i(double d);
extern "C" int64_t art_f2l(float f);
extern "C" int32_t art_f2i(float f);
namespace art {
class Array;
class Class;
class Field;
class AbstractMethod;
class Object;
// Given the context of a calling Method, use its DexCache to resolve a type to a Class. If it
// cannot be resolved, throw an error. If it can, use it to create an instance.
// When verification/compiler hasn't been able to verify access, optionally perform an access
// check.
static inline Object* AllocObjectFromCode(uint32_t type_idx, AbstractMethod* method, Thread* self,
bool access_check)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Class* klass = method->GetDexCacheResolvedTypes()->Get(type_idx);
Runtime* runtime = Runtime::Current();
if (UNLIKELY(klass == NULL)) {
klass = runtime->GetClassLinker()->ResolveType(type_idx, method);
if (klass == NULL) {
DCHECK(self->IsExceptionPending());
return NULL; // Failure
}
}
if (access_check) {
if (UNLIKELY(!klass->IsInstantiable())) {
self->ThrowNewException("Ljava/lang/InstantiationError;",
PrettyDescriptor(klass).c_str());
return NULL; // Failure
}
Class* referrer = method->GetDeclaringClass();
if (UNLIKELY(!referrer->CanAccess(klass))) {
ThrowIllegalAccessErrorClass(referrer, klass);
return NULL; // Failure
}
}
if (!klass->IsInitialized() &&
!runtime->GetClassLinker()->EnsureInitialized(klass, true, true)) {
DCHECK(self->IsExceptionPending());
return NULL; // Failure
}
return klass->AllocObject(self);
}
// Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If
// it cannot be resolved, throw an error. If it can, use it to create an array.
// When verification/compiler hasn't been able to verify access, optionally perform an access
// check.
static inline Array* AllocArrayFromCode(uint32_t type_idx, AbstractMethod* method, int32_t component_count,
Thread* self, bool access_check)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (UNLIKELY(component_count < 0)) {
self->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;", "%d", component_count);
return NULL; // Failure
}
Class* klass = method->GetDexCacheResolvedTypes()->Get(type_idx);
if (UNLIKELY(klass == NULL)) { // Not in dex cache so try to resolve
klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method);
if (klass == NULL) { // Error
DCHECK(Thread::Current()->IsExceptionPending());
return NULL; // Failure
}
CHECK(klass->IsArrayClass()) << PrettyClass(klass);
}
if (access_check) {
Class* referrer = method->GetDeclaringClass();
if (UNLIKELY(!referrer->CanAccess(klass))) {
ThrowIllegalAccessErrorClass(referrer, klass);
return NULL; // Failure
}
}
return Array::Alloc(self, klass, component_count);
}
extern Array* CheckAndAllocArrayFromCode(uint32_t type_idx, AbstractMethod* method, int32_t component_count,
Thread* self, bool access_check)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Type of find field operation for fast and slow case.
enum FindFieldType {
InstanceObjectRead,
InstanceObjectWrite,
InstancePrimitiveRead,
InstancePrimitiveWrite,
StaticObjectRead,
StaticObjectWrite,
StaticPrimitiveRead,
StaticPrimitiveWrite,
};
// Slow field find that can initialize classes and may throw exceptions.
extern Field* FindFieldFromCode(uint32_t field_idx, const AbstractMethod* referrer, Thread* self,
FindFieldType type, size_t expected_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Fast path field resolution that can't initialize classes or throw exceptions.
static inline Field* FindFieldFast(uint32_t field_idx, const AbstractMethod* referrer,
FindFieldType type, size_t expected_size)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
Field* resolved_field = referrer->GetDeclaringClass()->GetDexCache()->GetResolvedField(field_idx);
if (UNLIKELY(resolved_field == NULL)) {
return NULL;
}
Class* fields_class = resolved_field->GetDeclaringClass();
// Check class is initiliazed or initializing.
if (UNLIKELY(!fields_class->IsInitializing())) {
return NULL;
}
// Check for incompatible class change.
bool is_primitive;
bool is_set;
bool is_static;
switch (type) {
case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break;
case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break;
case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break;
case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break;
case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break;
case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break;
case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break;
case StaticPrimitiveWrite: is_primitive = true; is_set = true; is_static = true; break;
default: LOG(FATAL) << "UNREACHABLE"; // Assignment below to avoid GCC warnings.
is_primitive = true; is_set = true; is_static = true; break;
}
if (UNLIKELY(resolved_field->IsStatic() != is_static)) {
// Incompatible class change.
return NULL;
}
Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(fields_class) ||
!referring_class->CanAccessMember(fields_class,
resolved_field->GetAccessFlags()) ||
(is_set && resolved_field->IsFinal() && (fields_class != referring_class)))) {
// Illegal access.
return NULL;
}
FieldHelper fh(resolved_field);
if (UNLIKELY(fh.IsPrimitiveType() != is_primitive ||
fh.FieldSize() != expected_size)) {
return NULL;
}
return resolved_field;
}
// Fast path method resolution that can't throw exceptions.
static inline AbstractMethod* FindMethodFast(uint32_t method_idx, Object* this_object,
const AbstractMethod* referrer, bool access_check, InvokeType type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
bool is_direct = type == kStatic || type == kDirect;
if (UNLIKELY(this_object == NULL && !is_direct)) {
return NULL;
}
AbstractMethod* resolved_method =
referrer->GetDeclaringClass()->GetDexCache()->GetResolvedMethod(method_idx);
if (UNLIKELY(resolved_method == NULL)) {
return NULL;
}
if (access_check) {
// Check for incompatible class change errors and access.
bool icce = resolved_method->CheckIncompatibleClassChange(type);
if (UNLIKELY(icce)) {
return NULL;
}
Class* methods_class = resolved_method->GetDeclaringClass();
Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(methods_class) ||
!referring_class->CanAccessMember(methods_class,
resolved_method->GetAccessFlags()))) {
// Potential illegal access, may need to refine the method's class.
return NULL;
}
}
if (type == kInterface) { // Most common form of slow path dispatch.
return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
} else if (is_direct) {
return resolved_method;
} else if (type == kSuper) {
return referrer->GetDeclaringClass()->GetSuperClass()->GetVTable()->
Get(resolved_method->GetMethodIndex());
} else {
DCHECK(type == kVirtual);
return this_object->GetClass()->GetVTable()->Get(resolved_method->GetMethodIndex());
}
}
extern AbstractMethod* FindMethodFromCode(uint32_t method_idx, Object* this_object, AbstractMethod* referrer,
Thread* self, bool access_check, InvokeType type)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
extern Class* ResolveVerifyAndClinit(uint32_t type_idx, const AbstractMethod* referrer, Thread* self,
bool can_run_clinit, bool verify_access)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
extern void ThrowStackOverflowError(Thread* self) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static inline String* ResolveStringFromCode(const AbstractMethod* referrer, uint32_t string_idx)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
return class_linker->ResolveString(string_idx, referrer);
}
static inline void UnlockJniSynchronizedMethod(jobject locked, Thread* self)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
UNLOCK_FUNCTION(monitor_lock_) {
// Save any pending exception over monitor exit call.
Throwable* saved_exception = NULL;
if (UNLIKELY(self->IsExceptionPending())) {
saved_exception = self->GetException();
self->ClearException();
}
// Decode locked object and unlock, before popping local references.
self->DecodeJObject(locked)->MonitorExit(self);
if (UNLIKELY(self->IsExceptionPending())) {
LOG(FATAL) << "Synchronized JNI code returning with an exception:\n"
<< saved_exception->Dump()
<< "\nEncountered second exception during implicit MonitorExit:\n"
<< self->GetException()->Dump();
}
// Restore pending exception.
if (saved_exception != NULL) {
self->SetException(saved_exception);
}
}
static inline void CheckReferenceResult(Object* o, Thread* self)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (o == NULL) {
return;
}
if (o == kInvalidIndirectRefObject) {
JniAbortF(NULL, "invalid reference returned from %s",
PrettyMethod(self->GetCurrentMethod()).c_str());
}
// Make sure that the result is an instance of the type this method was expected to return.
AbstractMethod* m = self->GetCurrentMethod();
MethodHelper mh(m);
Class* return_type = mh.GetReturnType();
if (!o->InstanceOf(return_type)) {
JniAbortF(NULL, "attempt to return an instance of %s from %s",
PrettyTypeOf(o).c_str(), PrettyMethod(m).c_str());
}
}
static inline void CheckSuspend(Thread* thread)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
for (;;) {
if (thread->ReadFlag(kCheckpointRequest)) {
thread->RunCheckpointFunction();
thread->AtomicClearFlag(kCheckpointRequest);
} else if (thread->ReadFlag(kSuspendRequest)) {
thread->FullSuspendCheck();
} else {
break;
}
}
}
} // namespace art
#endif // ART_SRC_RUNTIME_SUPPORT_H_