compiler/common_compiler_test.cc - platform/art - Gitiles

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "common_compiler_test.h"

 #include "arch/instruction_set_features.h"
 #include "art_field-inl.h"
 #include "art_method.h"
 #include "base/enums.h"
 #include "class_linker.h"
 #include "compiled_method.h"
 #include "dex/quick_compiler_callbacks.h"
 #include "dex/verification_results.h"
 #include "driver/compiler_driver.h"
 #include "driver/compiler_options.h"
 #include "interpreter/interpreter.h"
 #include "mirror/class_loader.h"
 #include "mirror/class-inl.h"
 #include "mirror/dex_cache.h"
 #include "mirror/object-inl.h"
 #include "oat_quick_method_header.h"
 #include "scoped_thread_state_change-inl.h"
 #include "thread-inl.h"
 #include "utils.h"

 namespace art {

 CommonCompilerTest::CommonCompilerTest() {}
 CommonCompilerTest::~CommonCompilerTest() {}

 void CommonCompilerTest::MakeExecutable(ArtMethod* method) {
   CHECK(method != nullptr);

   const CompiledMethod* compiled_method = nullptr;
   if (!method->IsAbstract()) {
     mirror::DexCache* dex_cache = method->GetDeclaringClass()->GetDexCache();
     const DexFile& dex_file = *dex_cache->GetDexFile();
     compiled_method =
         compiler_driver_->GetCompiledMethod(MethodReference(&dex_file,
                                                             method->GetDexMethodIndex()));
   }
   if (compiled_method != nullptr) {
     ArrayRef<const uint8_t> code = compiled_method->GetQuickCode();
     uint32_t code_size = code.size();
     CHECK_NE(0u, code_size);
     ArrayRef<const uint8_t> vmap_table = compiled_method->GetVmapTable();
     uint32_t vmap_table_offset = vmap_table.empty() ? 0u
         : sizeof(OatQuickMethodHeader) + vmap_table.size();
     OatQuickMethodHeader method_header(vmap_table_offset,
                                        compiled_method->GetFrameSizeInBytes(),
                                        compiled_method->GetCoreSpillMask(),
                                        compiled_method->GetFpSpillMask(),
                                        code_size);

     header_code_and_maps_chunks_.push_back(std::vector<uint8_t>());
     std::vector<uint8_t>* chunk = &header_code_and_maps_chunks_.back();
     const size_t max_padding = GetInstructionSetAlignment(compiled_method->GetInstructionSet());
     const size_t size = vmap_table.size() + sizeof(method_header) + code_size;
     chunk->reserve(size + max_padding);
     chunk->resize(sizeof(method_header));
     memcpy(&(*chunk)[0], &method_header, sizeof(method_header));
     chunk->insert(chunk->begin(), vmap_table.begin(), vmap_table.end());
     chunk->insert(chunk->end(), code.begin(), code.end());
     CHECK_EQ(chunk->size(), size);
     const void* unaligned_code_ptr = chunk->data() + (size - code_size);
     size_t offset = dchecked_integral_cast<size_t>(reinterpret_cast<uintptr_t>(unaligned_code_ptr));
     size_t padding = compiled_method->AlignCode(offset) - offset;
     // Make sure no resizing takes place.
     CHECK_GE(chunk->capacity(), chunk->size() + padding);
     chunk->insert(chunk->begin(), padding, 0);
     const void* code_ptr = reinterpret_cast<const uint8_t*>(unaligned_code_ptr) + padding;
     CHECK_EQ(code_ptr, static_cast<const void*>(chunk->data() + (chunk->size() - code_size)));
     MakeExecutable(code_ptr, code.size());
     const void* method_code = CompiledMethod::CodePointer(code_ptr,
                                                           compiled_method->GetInstructionSet());
     LOG(INFO) << "MakeExecutable " << method->PrettyMethod() << " code=" << method_code;
     class_linker_->SetEntryPointsToCompiledCode(method, method_code);
   } else {
     // No code? You must mean to go into the interpreter.
     // Or the generic JNI...
     class_linker_->SetEntryPointsToInterpreter(method);
   }
 }

 void CommonCompilerTest::MakeExecutable(const void* code_start, size_t code_length) {
   CHECK(code_start != nullptr);
   CHECK_NE(code_length, 0U);
   uintptr_t data = reinterpret_cast<uintptr_t>(code_start);
   uintptr_t base = RoundDown(data, kPageSize);
   uintptr_t limit = RoundUp(data + code_length, kPageSize);
   uintptr_t len = limit - base;
   int result = mprotect(reinterpret_cast<void*>(base), len, PROT_READ | PROT_WRITE | PROT_EXEC);
   CHECK_EQ(result, 0);

   FlushInstructionCache(reinterpret_cast<char*>(base), reinterpret_cast<char*>(base + len));
 }

 void CommonCompilerTest::MakeExecutable(ObjPtr<mirror::ClassLoader> class_loader,
                                         const char* class_name) {
   std::string class_descriptor(DotToDescriptor(class_name));
   Thread* self = Thread::Current();
   StackHandleScope<1> hs(self);
   Handle<mirror::ClassLoader> loader(hs.NewHandle(class_loader));
   mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), loader);
   CHECK(klass != nullptr) << "Class not found " << class_name;
   PointerSize pointer_size = class_linker_->GetImagePointerSize();
   for (auto& m : klass->GetMethods(pointer_size)) {
     MakeExecutable(&m);
   }
 }

 // Get the set of image classes given to the compiler-driver in SetUp. Note: the compiler
 // driver assumes ownership of the set, so the test should properly release the set.
 std::unordered_set<std::string>* CommonCompilerTest::GetImageClasses() {
   // Empty set: by default no classes are retained in the image.
   return new std::unordered_set<std::string>();
 }

 // Get the set of compiled classes given to the compiler-driver in SetUp. Note: the compiler
 // driver assumes ownership of the set, so the test should properly release the set.
 std::unordered_set<std::string>* CommonCompilerTest::GetCompiledClasses() {
   // Null, no selection of compiled-classes.
   return nullptr;
 }

 // Get the set of compiled methods given to the compiler-driver in SetUp. Note: the compiler
 // driver assumes ownership of the set, so the test should properly release the set.
 std::unordered_set<std::string>* CommonCompilerTest::GetCompiledMethods() {
   // Null, no selection of compiled-methods.
   return nullptr;
 }

 // Get ProfileCompilationInfo that should be passed to the driver.
 ProfileCompilationInfo* CommonCompilerTest::GetProfileCompilationInfo() {
   // Null, profile information will not be taken into account.
   return nullptr;
 }

 void CommonCompilerTest::SetUp() {
   CommonRuntimeTest::SetUp();
   {
     ScopedObjectAccess soa(Thread::Current());

     const InstructionSet instruction_set = kRuntimeISA;
     // Take the default set of instruction features from the build.
     instruction_set_features_ = InstructionSetFeatures::FromCppDefines();

     runtime_->SetInstructionSet(instruction_set);
     for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
       Runtime::CalleeSaveType type = Runtime::CalleeSaveType(i);
       if (!runtime_->HasCalleeSaveMethod(type)) {
         runtime_->SetCalleeSaveMethod(runtime_->CreateCalleeSaveMethod(), type);
       }
     }

     timer_.reset(new CumulativeLogger("Compilation times"));
     CreateCompilerDriver(compiler_kind_, instruction_set);
   }
 }

 void CommonCompilerTest::CreateCompilerDriver(Compiler::Kind kind,
                                               InstructionSet isa,
                                               size_t number_of_threads) {
   compiler_options_->boot_image_ = true;
   compiler_driver_.reset(new CompilerDriver(compiler_options_.get(),
                                             verification_results_.get(),
                                             kind,
                                             isa,
                                             instruction_set_features_.get(),
                                             GetImageClasses(),
                                             GetCompiledClasses(),
                                             GetCompiledMethods(),
                                             number_of_threads,
                                             /* dump_stats */ true,
                                             /* dump_passes */ true,
                                             timer_.get(),
                                             /* swap_fd */ -1,
                                             GetProfileCompilationInfo()));
   // We typically don't generate an image in unit tests, disable this optimization by default.
   compiler_driver_->SetSupportBootImageFixup(false);
 }

 void CommonCompilerTest::SetUpRuntimeOptions(RuntimeOptions* options) {
   CommonRuntimeTest::SetUpRuntimeOptions(options);

   compiler_options_.reset(new CompilerOptions);
   verification_results_.reset(new VerificationResults(compiler_options_.get()));
   callbacks_.reset(new QuickCompilerCallbacks(verification_results_.get(),
                                               CompilerCallbacks::CallbackMode::kCompileApp));
 }

 Compiler::Kind CommonCompilerTest::GetCompilerKind() const {
   return compiler_kind_;
 }

 void CommonCompilerTest::SetCompilerKind(Compiler::Kind compiler_kind) {
   compiler_kind_ = compiler_kind;
 }

 InstructionSet CommonCompilerTest::GetInstructionSet() const {
   DCHECK(compiler_driver_.get() != nullptr);
   return compiler_driver_->GetInstructionSet();
 }

 void CommonCompilerTest::TearDown() {
   timer_.reset();
   compiler_driver_.reset();
   callbacks_.reset();
   verification_results_.reset();
   compiler_options_.reset();
   image_reservation_.reset();

   CommonRuntimeTest::TearDown();
 }

 void CommonCompilerTest::CompileClass(mirror::ClassLoader* class_loader, const char* class_name) {
   std::string class_descriptor(DotToDescriptor(class_name));
   Thread* self = Thread::Current();
   StackHandleScope<1> hs(self);
   Handle<mirror::ClassLoader> loader(hs.NewHandle(class_loader));
   mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), loader);
   CHECK(klass != nullptr) << "Class not found " << class_name;
   auto pointer_size = class_linker_->GetImagePointerSize();
   for (auto& m : klass->GetMethods(pointer_size)) {
     CompileMethod(&m);
   }
 }

 void CommonCompilerTest::CompileMethod(ArtMethod* method) {
   CHECK(method != nullptr);
   TimingLogger timings("CommonTest::CompileMethod", false, false);
   TimingLogger::ScopedTiming t(__FUNCTION__, &timings);
   compiler_driver_->CompileOne(Thread::Current(), method, &timings);
   TimingLogger::ScopedTiming t2("MakeExecutable", &timings);
   MakeExecutable(method);
 }

 void CommonCompilerTest::CompileDirectMethod(Handle<mirror::ClassLoader> class_loader,
                                              const char* class_name, const char* method_name,
                                              const char* signature) {
   std::string class_descriptor(DotToDescriptor(class_name));
   Thread* self = Thread::Current();
   mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), class_loader);
   CHECK(klass != nullptr) << "Class not found " << class_name;
   auto pointer_size = class_linker_->GetImagePointerSize();
   ArtMethod* method = klass->FindDirectMethod(method_name, signature, pointer_size);
   CHECK(method != nullptr) << "Direct method not found: "
       << class_name << "." << method_name << signature;
   CompileMethod(method);
 }

 void CommonCompilerTest::CompileVirtualMethod(Handle<mirror::ClassLoader> class_loader,
                                               const char* class_name, const char* method_name,
                                               const char* signature) {
   std::string class_descriptor(DotToDescriptor(class_name));
   Thread* self = Thread::Current();
   mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), class_loader);
   CHECK(klass != nullptr) << "Class not found " << class_name;
   auto pointer_size = class_linker_->GetImagePointerSize();
   ArtMethod* method = klass->FindVirtualMethod(method_name, signature, pointer_size);
   CHECK(method != nullptr) << "Virtual method not found: "
       << class_name << "." << method_name << signature;
   CompileMethod(method);
 }

 void CommonCompilerTest::ReserveImageSpace() {
   // Reserve where the image will be loaded up front so that other parts of test set up don't
   // accidentally end up colliding with the fixed memory address when we need to load the image.
   std::string error_msg;
   MemMap::Init();
   image_reservation_.reset(MemMap::MapAnonymous("image reservation",
                                                 reinterpret_cast<uint8_t*>(ART_BASE_ADDRESS),
                                                 (size_t)120 * 1024 * 1024,  // 120MB
                                                 PROT_NONE,
                                                 false /* no need for 4gb flag with fixed mmap*/,
                                                 false /* not reusing existing reservation */,
                                                 &error_msg));
   CHECK(image_reservation_.get() != nullptr) << error_msg;
 }

 void CommonCompilerTest::UnreserveImageSpace() {
   image_reservation_.reset();
 }

 }  // namespace art
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "common_compiler_test.h"

	#include "arch/instruction_set_features.h"
	#include "art_field-inl.h"
	#include "art_method.h"
	#include "base/enums.h"
	#include "class_linker.h"
	#include "compiled_method.h"
	#include "dex/quick_compiler_callbacks.h"
	#include "dex/verification_results.h"
	#include "driver/compiler_driver.h"
	#include "driver/compiler_options.h"
	#include "interpreter/interpreter.h"
	#include "mirror/class_loader.h"
	#include "mirror/class-inl.h"
	#include "mirror/dex_cache.h"
	#include "mirror/object-inl.h"
	#include "oat_quick_method_header.h"
	#include "scoped_thread_state_change-inl.h"
	#include "thread-inl.h"
	#include "utils.h"

	namespace art {

	CommonCompilerTest::CommonCompilerTest() {}
	CommonCompilerTest::~CommonCompilerTest() {}

	void CommonCompilerTest::MakeExecutable(ArtMethod* method) {
	CHECK(method != nullptr);

	const CompiledMethod* compiled_method = nullptr;
	if (!method->IsAbstract()) {
	mirror::DexCache* dex_cache = method->GetDeclaringClass()->GetDexCache();
	const DexFile& dex_file = *dex_cache->GetDexFile();
	compiled_method =
	compiler_driver_->GetCompiledMethod(MethodReference(&dex_file,
	method->GetDexMethodIndex()));
	}
	if (compiled_method != nullptr) {
	ArrayRef<const uint8_t> code = compiled_method->GetQuickCode();
	uint32_t code_size = code.size();
	CHECK_NE(0u, code_size);
	ArrayRef<const uint8_t> vmap_table = compiled_method->GetVmapTable();
	uint32_t vmap_table_offset = vmap_table.empty() ? 0u
	: sizeof(OatQuickMethodHeader) + vmap_table.size();
	OatQuickMethodHeader method_header(vmap_table_offset,
	compiled_method->GetFrameSizeInBytes(),
	compiled_method->GetCoreSpillMask(),
	compiled_method->GetFpSpillMask(),
	code_size);

	header_code_and_maps_chunks_.push_back(std::vector<uint8_t>());
	std::vector<uint8_t>* chunk = &header_code_and_maps_chunks_.back();
	const size_t max_padding = GetInstructionSetAlignment(compiled_method->GetInstructionSet());
	const size_t size = vmap_table.size() + sizeof(method_header) + code_size;
	chunk->reserve(size + max_padding);
	chunk->resize(sizeof(method_header));
	memcpy(&(*chunk)[0], &method_header, sizeof(method_header));
	chunk->insert(chunk->begin(), vmap_table.begin(), vmap_table.end());
	chunk->insert(chunk->end(), code.begin(), code.end());
	CHECK_EQ(chunk->size(), size);
	const void* unaligned_code_ptr = chunk->data() + (size - code_size);
	size_t offset = dchecked_integral_cast<size_t>(reinterpret_cast<uintptr_t>(unaligned_code_ptr));
	size_t padding = compiled_method->AlignCode(offset) - offset;
	// Make sure no resizing takes place.
	CHECK_GE(chunk->capacity(), chunk->size() + padding);
	chunk->insert(chunk->begin(), padding, 0);
	const void* code_ptr = reinterpret_cast<const uint8_t*>(unaligned_code_ptr) + padding;
	CHECK_EQ(code_ptr, static_cast<const void*>(chunk->data() + (chunk->size() - code_size)));
	MakeExecutable(code_ptr, code.size());
	const void* method_code = CompiledMethod::CodePointer(code_ptr,
	compiled_method->GetInstructionSet());
	LOG(INFO) << "MakeExecutable " << method->PrettyMethod() << " code=" << method_code;
	class_linker_->SetEntryPointsToCompiledCode(method, method_code);
	} else {
	// No code? You must mean to go into the interpreter.
	// Or the generic JNI...
	class_linker_->SetEntryPointsToInterpreter(method);
	}
	}

	void CommonCompilerTest::MakeExecutable(const void* code_start, size_t code_length) {
	CHECK(code_start != nullptr);
	CHECK_NE(code_length, 0U);
	uintptr_t data = reinterpret_cast<uintptr_t>(code_start);
	uintptr_t base = RoundDown(data, kPageSize);
	uintptr_t limit = RoundUp(data + code_length, kPageSize);
	uintptr_t len = limit - base;
	int result = mprotect(reinterpret_cast<void*>(base), len, PROT_READ \| PROT_WRITE \| PROT_EXEC);
	CHECK_EQ(result, 0);

	FlushInstructionCache(reinterpret_cast<char>(base), reinterpret_cast<char>(base + len));
	}

	void CommonCompilerTest::MakeExecutable(ObjPtr<mirror::ClassLoader> class_loader,
	const char* class_name) {
	std::string class_descriptor(DotToDescriptor(class_name));
	Thread* self = Thread::Current();
	StackHandleScope<1> hs(self);
	Handle<mirror::ClassLoader> loader(hs.NewHandle(class_loader));
	mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), loader);
	CHECK(klass != nullptr) << "Class not found " << class_name;
	PointerSize pointer_size = class_linker_->GetImagePointerSize();
	for (auto& m : klass->GetMethods(pointer_size)) {
	MakeExecutable(&m);
	}
	}

	// Get the set of image classes given to the compiler-driver in SetUp. Note: the compiler
	// driver assumes ownership of the set, so the test should properly release the set.
	std::unordered_set<std::string>* CommonCompilerTest::GetImageClasses() {
	// Empty set: by default no classes are retained in the image.
	return new std::unordered_set<std::string>();
	}

	// Get the set of compiled classes given to the compiler-driver in SetUp. Note: the compiler
	// driver assumes ownership of the set, so the test should properly release the set.
	std::unordered_set<std::string>* CommonCompilerTest::GetCompiledClasses() {
	// Null, no selection of compiled-classes.
	return nullptr;
	}

	// Get the set of compiled methods given to the compiler-driver in SetUp. Note: the compiler
	// driver assumes ownership of the set, so the test should properly release the set.
	std::unordered_set<std::string>* CommonCompilerTest::GetCompiledMethods() {
	// Null, no selection of compiled-methods.
	return nullptr;
	}

	// Get ProfileCompilationInfo that should be passed to the driver.
	ProfileCompilationInfo* CommonCompilerTest::GetProfileCompilationInfo() {
	// Null, profile information will not be taken into account.
	return nullptr;
	}

	void CommonCompilerTest::SetUp() {
	CommonRuntimeTest::SetUp();
	{
	ScopedObjectAccess soa(Thread::Current());

	const InstructionSet instruction_set = kRuntimeISA;
	// Take the default set of instruction features from the build.
	instruction_set_features_ = InstructionSetFeatures::FromCppDefines();

	runtime_->SetInstructionSet(instruction_set);
	for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
	Runtime::CalleeSaveType type = Runtime::CalleeSaveType(i);
	if (!runtime_->HasCalleeSaveMethod(type)) {
	runtime_->SetCalleeSaveMethod(runtime_->CreateCalleeSaveMethod(), type);
	}
	}

	timer_.reset(new CumulativeLogger("Compilation times"));
	CreateCompilerDriver(compiler_kind_, instruction_set);
	}
	}

	void CommonCompilerTest::CreateCompilerDriver(Compiler::Kind kind,
	InstructionSet isa,
	size_t number_of_threads) {
	compiler_options_->boot_image_ = true;
	compiler_driver_.reset(new CompilerDriver(compiler_options_.get(),
	verification_results_.get(),
	kind,
	isa,
	instruction_set_features_.get(),
	GetImageClasses(),
	GetCompiledClasses(),
	GetCompiledMethods(),
	number_of_threads,
	/* dump_stats */ true,
	/* dump_passes */ true,
	timer_.get(),
	/* swap_fd */ -1,
	GetProfileCompilationInfo()));
	// We typically don't generate an image in unit tests, disable this optimization by default.
	compiler_driver_->SetSupportBootImageFixup(false);
	}

	void CommonCompilerTest::SetUpRuntimeOptions(RuntimeOptions* options) {
	CommonRuntimeTest::SetUpRuntimeOptions(options);

	compiler_options_.reset(new CompilerOptions);
	verification_results_.reset(new VerificationResults(compiler_options_.get()));
	callbacks_.reset(new QuickCompilerCallbacks(verification_results_.get(),
	CompilerCallbacks::CallbackMode::kCompileApp));
	}

	Compiler::Kind CommonCompilerTest::GetCompilerKind() const {
	return compiler_kind_;
	}

	void CommonCompilerTest::SetCompilerKind(Compiler::Kind compiler_kind) {
	compiler_kind_ = compiler_kind;
	}

	InstructionSet CommonCompilerTest::GetInstructionSet() const {
	DCHECK(compiler_driver_.get() != nullptr);
	return compiler_driver_->GetInstructionSet();
	}

	void CommonCompilerTest::TearDown() {
	timer_.reset();
	compiler_driver_.reset();
	callbacks_.reset();
	verification_results_.reset();
	compiler_options_.reset();
	image_reservation_.reset();

	CommonRuntimeTest::TearDown();
	}

	void CommonCompilerTest::CompileClass(mirror::ClassLoader* class_loader, const char* class_name) {
	std::string class_descriptor(DotToDescriptor(class_name));
	Thread* self = Thread::Current();
	StackHandleScope<1> hs(self);
	Handle<mirror::ClassLoader> loader(hs.NewHandle(class_loader));
	mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), loader);
	CHECK(klass != nullptr) << "Class not found " << class_name;
	auto pointer_size = class_linker_->GetImagePointerSize();
	for (auto& m : klass->GetMethods(pointer_size)) {
	CompileMethod(&m);
	}
	}

	void CommonCompilerTest::CompileMethod(ArtMethod* method) {
	CHECK(method != nullptr);
	TimingLogger timings("CommonTest::CompileMethod", false, false);
	TimingLogger::ScopedTiming t(__FUNCTION__, &timings);
	compiler_driver_->CompileOne(Thread::Current(), method, &timings);
	TimingLogger::ScopedTiming t2("MakeExecutable", &timings);
	MakeExecutable(method);
	}

	void CommonCompilerTest::CompileDirectMethod(Handle<mirror::ClassLoader> class_loader,
	const char* class_name, const char* method_name,
	const char* signature) {
	std::string class_descriptor(DotToDescriptor(class_name));
	Thread* self = Thread::Current();
	mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), class_loader);
	CHECK(klass != nullptr) << "Class not found " << class_name;
	auto pointer_size = class_linker_->GetImagePointerSize();
	ArtMethod* method = klass->FindDirectMethod(method_name, signature, pointer_size);
	CHECK(method != nullptr) << "Direct method not found: "
	<< class_name << "." << method_name << signature;
	CompileMethod(method);
	}

	void CommonCompilerTest::CompileVirtualMethod(Handle<mirror::ClassLoader> class_loader,
	const char* class_name, const char* method_name,
	const char* signature) {
	std::string class_descriptor(DotToDescriptor(class_name));
	Thread* self = Thread::Current();
	mirror::Class* klass = class_linker_->FindClass(self, class_descriptor.c_str(), class_loader);
	CHECK(klass != nullptr) << "Class not found " << class_name;
	auto pointer_size = class_linker_->GetImagePointerSize();
	ArtMethod* method = klass->FindVirtualMethod(method_name, signature, pointer_size);
	CHECK(method != nullptr) << "Virtual method not found: "
	<< class_name << "." << method_name << signature;
	CompileMethod(method);
	}

	void CommonCompilerTest::ReserveImageSpace() {
	// Reserve where the image will be loaded up front so that other parts of test set up don't
	// accidentally end up colliding with the fixed memory address when we need to load the image.
	std::string error_msg;
	MemMap::Init();
	image_reservation_.reset(MemMap::MapAnonymous("image reservation",
	reinterpret_cast<uint8_t*>(ART_BASE_ADDRESS),
	(size_t)120 * 1024 * 1024, // 120MB
	PROT_NONE,
	false /* no need for 4gb flag with fixed mmap*/,
	false /* not reusing existing reservation */,
	&error_msg));
	CHECK(image_reservation_.get() != nullptr) << error_msg;
	}

	void CommonCompilerTest::UnreserveImageSpace() {
	image_reservation_.reset();
	}

	} // namespace art