src/runtime_support.h - platform/art - Git at Google

 /*
  * 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 "dex_file.h"
 #include "invoke_type.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 Method;
 class Object;

 // Helpers to give consistent descriptive exception messages
 void ThrowNewIllegalAccessErrorClass(Thread* self, Class* referrer, Class* accessed);
 void ThrowNewIllegalAccessErrorClassForMethodDispatch(Thread* self, Class* referrer,
                                                       Class* accessed,
                                                       const Method* caller,
                                                       const Method* called,
                                                       InvokeType type);
 void ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(Thread* self,
                                                                    const Method* referrer,
                                                                    const Method* interface_method,
                                                                    Object* this_object);
 void ThrowNewIllegalAccessErrorField(Thread* self, Class* referrer, Field* accessed);
 void ThrowNewIllegalAccessErrorFinalField(Thread* self, const Method* referrer, Field* accessed);

 void ThrowNewIllegalAccessErrorMethod(Thread* self, Class* referrer, Method* accessed);
 void ThrowNullPointerExceptionForFieldAccess(Thread* self, Field* field, bool is_read);
 void ThrowNullPointerExceptionForMethodAccess(Thread* self, Method* caller, uint32_t method_idx,
                                               InvokeType type);
 void ThrowNullPointerExceptionFromDexPC(Thread* self, Method* caller, uint32_t dex_pc);
 void ThrowVerificationError(Thread* self, const Method* method, int32_t kind, int32_t ref);

 std::string FieldNameFromIndex(const Method* method, uint32_t ref,
                                verifier::VerifyErrorRefType ref_type, bool access);
 std::string MethodNameFromIndex(const Method* method, uint32_t ref,
                                 verifier::VerifyErrorRefType ref_type, bool access);

 // 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, Method* method, Thread* self,
                                           bool access_check) {
   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))) {
       ThrowNewIllegalAccessErrorClass(self, referrer, klass);
       return NULL;  // Failure
     }
   }
   if (!runtime->GetClassLinker()->EnsureInitialized(klass, true, true)) {
     DCHECK(self->IsExceptionPending());
     return NULL;  // Failure
   }
   return klass->AllocObject();
 }

 // 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, Method* method, int32_t component_count,
                                         Thread* self, bool access_check) {
   if (UNLIKELY(component_count < 0)) {
     Thread::Current()->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))) {
       ThrowNewIllegalAccessErrorClass(self, referrer, klass);
       return NULL;  // Failure
     }
   }
   return Array::Alloc(klass, component_count);
 }

 extern Array* CheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count,
                                          Thread* self, bool access_check);

 extern Field* FindFieldFromCode(uint32_t field_idx, const Method* referrer, Thread* self,
                                 bool is_static, bool is_primitive, bool is_set,
                                 size_t expected_size);

 // Fast path field resolution that can't throw exceptions
 static inline Field* FindFieldFast(uint32_t field_idx, const Method* referrer, bool is_primitive,
                                    size_t expected_size, bool is_set) {
   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;
   }
   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 Method* FindMethodFast(uint32_t method_idx, Object* this_object, const Method* referrer,
                               bool access_check, InvokeType type) {
   bool is_direct = type == kStatic || type == kDirect;
   if (UNLIKELY(this_object == NULL && !is_direct)) {
     return NULL;
   }
   Method* resolved_method =
       referrer->GetDeclaringClass()->GetDexCache()->GetResolvedMethod(method_idx);
   if (UNLIKELY(resolved_method == NULL)) {
     return NULL;
   }
   if (access_check) {
     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
       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 Method* FindMethodFromCode(uint32_t method_idx, Object* this_object, const Method* referrer,
                                   Thread* self, bool access_check, InvokeType type);

 extern Class* ResolveVerifyAndClinit(uint32_t type_idx, const Method* referrer, Thread* self,
                                      bool can_run_clinit, bool verify_access);

 static inline String* ResolveStringFromCode(const Method* referrer, uint32_t string_idx) {
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
   return class_linker->ResolveString(string_idx, referrer);
 }

 }  // namespace art

 #endif  // ART_SRC_RUNTIME_SUPPORT_H_
	/*
	* 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 "dex_file.h"
	#include "invoke_type.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 Method;
	class Object;

	// Helpers to give consistent descriptive exception messages
	void ThrowNewIllegalAccessErrorClass(Thread* self, Class* referrer, Class* accessed);
	void ThrowNewIllegalAccessErrorClassForMethodDispatch(Thread* self, Class* referrer,
	Class* accessed,
	const Method* caller,
	const Method* called,
	InvokeType type);
	void ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(Thread* self,
	const Method* referrer,
	const Method* interface_method,
	Object* this_object);
	void ThrowNewIllegalAccessErrorField(Thread* self, Class* referrer, Field* accessed);
	void ThrowNewIllegalAccessErrorFinalField(Thread* self, const Method* referrer, Field* accessed);

	void ThrowNewIllegalAccessErrorMethod(Thread* self, Class* referrer, Method* accessed);
	void ThrowNullPointerExceptionForFieldAccess(Thread* self, Field* field, bool is_read);
	void ThrowNullPointerExceptionForMethodAccess(Thread* self, Method* caller, uint32_t method_idx,
	InvokeType type);
	void ThrowNullPointerExceptionFromDexPC(Thread* self, Method* caller, uint32_t dex_pc);
	void ThrowVerificationError(Thread* self, const Method* method, int32_t kind, int32_t ref);

	std::string FieldNameFromIndex(const Method* method, uint32_t ref,
	verifier::VerifyErrorRefType ref_type, bool access);
	std::string MethodNameFromIndex(const Method* method, uint32_t ref,
	verifier::VerifyErrorRefType ref_type, bool access);

	// 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, Method* method, Thread* self,
	bool access_check) {
	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))) {
	ThrowNewIllegalAccessErrorClass(self, referrer, klass);
	return NULL; // Failure
	}
	}
	if (!runtime->GetClassLinker()->EnsureInitialized(klass, true, true)) {
	DCHECK(self->IsExceptionPending());
	return NULL; // Failure
	}
	return klass->AllocObject();
	}

	// 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, Method* method, int32_t component_count,
	Thread* self, bool access_check) {
	if (UNLIKELY(component_count < 0)) {
	Thread::Current()->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))) {
	ThrowNewIllegalAccessErrorClass(self, referrer, klass);
	return NULL; // Failure
	}
	}
	return Array::Alloc(klass, component_count);
	}

	extern Array* CheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count,
	Thread* self, bool access_check);

	extern Field* FindFieldFromCode(uint32_t field_idx, const Method* referrer, Thread* self,
	bool is_static, bool is_primitive, bool is_set,
	size_t expected_size);

	// Fast path field resolution that can't throw exceptions
	static inline Field* FindFieldFast(uint32_t field_idx, const Method* referrer, bool is_primitive,
	size_t expected_size, bool is_set) {
	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;
	}
	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 Method* FindMethodFast(uint32_t method_idx, Object* this_object, const Method* referrer,
	bool access_check, InvokeType type) {
	bool is_direct = type == kStatic \|\| type == kDirect;
	if (UNLIKELY(this_object == NULL && !is_direct)) {
	return NULL;
	}
	Method* resolved_method =
	referrer->GetDeclaringClass()->GetDexCache()->GetResolvedMethod(method_idx);
	if (UNLIKELY(resolved_method == NULL)) {
	return NULL;
	}
	if (access_check) {
	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
	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 Method* FindMethodFromCode(uint32_t method_idx, Object* this_object, const Method* referrer,
	Thread* self, bool access_check, InvokeType type);

	extern Class* ResolveVerifyAndClinit(uint32_t type_idx, const Method* referrer, Thread* self,
	bool can_run_clinit, bool verify_access);

	static inline String* ResolveStringFromCode(const Method* referrer, uint32_t string_idx) {
	ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
	return class_linker->ResolveString(string_idx, referrer);
	}

	} // namespace art

	#endif // ART_SRC_RUNTIME_SUPPORT_H_