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 "class_linker.h"
 #include "compiled_method.h"
 #include "dex/pass_manager.h"
 #include "dex/quick_compiler_callbacks.h"
 #include "dex/quick/dex_file_to_method_inliner_map.h"
 #include "dex/verification_results.h"
 #include "driver/compiler_driver.h"
 #include "driver/compiler_options.h"
 #include "interpreter/interpreter.h"
 #include "mirror/art_method.h"
 #include "mirror/dex_cache.h"
 #include "mirror/object-inl.h"
 #include "scoped_thread_state_change.h"
 #include "thread-inl.h"
 #include "utils.h"

 namespace art {

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

 void CommonCompilerTest::MakeExecutable(mirror::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) {
     const SwapVector<uint8_t>* code = compiled_method->GetQuickCode();
     uint32_t code_size = code->size();
     CHECK_NE(0u, code_size);
     const SwapVector<uint8_t>* vmap_table = compiled_method->GetVmapTable();
     uint32_t vmap_table_offset = vmap_table->empty() ? 0u
         : sizeof(OatQuickMethodHeader) + vmap_table->size();
     const SwapVector<uint8_t>* mapping_table = compiled_method->GetMappingTable();
     bool mapping_table_used = mapping_table != nullptr && !mapping_table->empty();
     size_t mapping_table_size = mapping_table_used ? mapping_table->size() : 0U;
     uint32_t mapping_table_offset = !mapping_table_used ? 0u
         : sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size;
     const SwapVector<uint8_t>* gc_map = compiled_method->GetGcMap();
     bool gc_map_used = gc_map != nullptr && !gc_map->empty();
     size_t gc_map_size = gc_map_used ? gc_map->size() : 0U;
     uint32_t gc_map_offset = !gc_map_used ? 0u
         : sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size + gc_map_size;
     OatQuickMethodHeader method_header(mapping_table_offset, vmap_table_offset, gc_map_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();
     size_t size = sizeof(method_header) + code_size + vmap_table->size() + mapping_table_size +
         gc_map_size;
     size_t code_offset = compiled_method->AlignCode(size - code_size);
     size_t padding = code_offset - (size - code_size);
     chunk->reserve(padding + size);
     chunk->resize(sizeof(method_header));
     memcpy(&(*chunk)[0], &method_header, sizeof(method_header));
     chunk->insert(chunk->begin(), vmap_table->begin(), vmap_table->end());
     if (mapping_table_used) {
       chunk->insert(chunk->begin(), mapping_table->begin(), mapping_table->end());
     }
     if (gc_map_used) {
       chunk->insert(chunk->begin(), gc_map->begin(), gc_map->end());
     }
     chunk->insert(chunk->begin(), padding, 0);
     chunk->insert(chunk->end(), code->begin(), code->end());
     CHECK_EQ(padding + size, chunk->size());
     const void* code_ptr = &(*chunk)[code_offset];
     MakeExecutable(code_ptr, code->size());
     const void* method_code = CompiledMethod::CodePointer(code_ptr,
                                                           compiled_method->GetInstructionSet());
     LOG(INFO) << "MakeExecutable " << PrettyMethod(method) << " 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);

   // Flush instruction cache
   // Only uses __builtin___clear_cache if GCC >= 4.3.3
 #if GCC_VERSION >= 40303
   __builtin___clear_cache(reinterpret_cast<void*>(base), reinterpret_cast<void*>(base + len));
 #else
   // Only warn if not Intel as Intel doesn't have cache flush instructions.
 #if !defined(__i386__) && !defined(__x86_64__)
   UNIMPLEMENTED(WARNING) << "cache flush";
 #endif
 #endif
 }

 void CommonCompilerTest::MakeExecutable(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;
   for (size_t i = 0; i < klass->NumDirectMethods(); i++) {
     MakeExecutable(klass->GetDirectMethod(i));
   }
   for (size_t i = 0; i < klass->NumVirtualMethods(); i++) {
     MakeExecutable(klass->GetVirtualMethod(i));
   }
 }

 // 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;
 }

 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_.reset(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);
       }
     }

     // TODO: make selectable
     Compiler::Kind compiler_kind = Compiler::kQuick;
     timer_.reset(new CumulativeLogger("Compilation times"));
     compiler_driver_.reset(new CompilerDriver(compiler_options_.get(),
                                               verification_results_.get(),
                                               method_inliner_map_.get(),
                                               compiler_kind, instruction_set,
                                               instruction_set_features_.get(),
                                               true,
                                               GetImageClasses(),
                                               GetCompiledClasses(),
                                               GetCompiledMethods(),
                                               2, true, true, "", timer_.get(), -1, ""));
   }
   // 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()));
   method_inliner_map_.reset(new DexFileToMethodInlinerMap);
   callbacks_.reset(new QuickCompilerCallbacks(verification_results_.get(),
                                               method_inliner_map_.get(),
                                               CompilerCallbacks::CallbackMode::kCompileApp));
 }

 void CommonCompilerTest::TearDown() {
   timer_.reset();
   compiler_driver_.reset();
   callbacks_.reset();
   method_inliner_map_.reset();
   verification_results_.reset();
   compiler_options_.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;
   for (size_t i = 0; i < klass->NumDirectMethods(); i++) {
     CompileMethod(klass->GetDirectMethod(i));
   }
   for (size_t i = 0; i < klass->NumVirtualMethods(); i++) {
     CompileMethod(klass->GetVirtualMethod(i));
   }
 }

 void CommonCompilerTest::CompileMethod(mirror::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;
   mirror::ArtMethod* method = klass->FindDirectMethod(method_name, signature);
   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;
   mirror::ArtMethod* method = klass->FindVirtualMethod(method_name, signature);
   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)100 * 1024 * 1024,  // 100MB
                                                 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 "class_linker.h"
	#include "compiled_method.h"
	#include "dex/pass_manager.h"
	#include "dex/quick_compiler_callbacks.h"
	#include "dex/quick/dex_file_to_method_inliner_map.h"
	#include "dex/verification_results.h"
	#include "driver/compiler_driver.h"
	#include "driver/compiler_options.h"
	#include "interpreter/interpreter.h"
	#include "mirror/art_method.h"
	#include "mirror/dex_cache.h"
	#include "mirror/object-inl.h"
	#include "scoped_thread_state_change.h"
	#include "thread-inl.h"
	#include "utils.h"

	namespace art {

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

	void CommonCompilerTest::MakeExecutable(mirror::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) {
	const SwapVector<uint8_t>* code = compiled_method->GetQuickCode();
	uint32_t code_size = code->size();
	CHECK_NE(0u, code_size);
	const SwapVector<uint8_t>* vmap_table = compiled_method->GetVmapTable();
	uint32_t vmap_table_offset = vmap_table->empty() ? 0u
	: sizeof(OatQuickMethodHeader) + vmap_table->size();
	const SwapVector<uint8_t>* mapping_table = compiled_method->GetMappingTable();
	bool mapping_table_used = mapping_table != nullptr && !mapping_table->empty();
	size_t mapping_table_size = mapping_table_used ? mapping_table->size() : 0U;
	uint32_t mapping_table_offset = !mapping_table_used ? 0u
	: sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size;
	const SwapVector<uint8_t>* gc_map = compiled_method->GetGcMap();
	bool gc_map_used = gc_map != nullptr && !gc_map->empty();
	size_t gc_map_size = gc_map_used ? gc_map->size() : 0U;
	uint32_t gc_map_offset = !gc_map_used ? 0u
	: sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size + gc_map_size;
	OatQuickMethodHeader method_header(mapping_table_offset, vmap_table_offset, gc_map_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();
	size_t size = sizeof(method_header) + code_size + vmap_table->size() + mapping_table_size +
	gc_map_size;
	size_t code_offset = compiled_method->AlignCode(size - code_size);
	size_t padding = code_offset - (size - code_size);
	chunk->reserve(padding + size);
	chunk->resize(sizeof(method_header));
	memcpy(&(*chunk)[0], &method_header, sizeof(method_header));
	chunk->insert(chunk->begin(), vmap_table->begin(), vmap_table->end());
	if (mapping_table_used) {
	chunk->insert(chunk->begin(), mapping_table->begin(), mapping_table->end());
	}
	if (gc_map_used) {
	chunk->insert(chunk->begin(), gc_map->begin(), gc_map->end());
	}
	chunk->insert(chunk->begin(), padding, 0);
	chunk->insert(chunk->end(), code->begin(), code->end());
	CHECK_EQ(padding + size, chunk->size());
	const void* code_ptr = &(*chunk)[code_offset];
	MakeExecutable(code_ptr, code->size());
	const void* method_code = CompiledMethod::CodePointer(code_ptr,
	compiled_method->GetInstructionSet());
	LOG(INFO) << "MakeExecutable " << PrettyMethod(method) << " 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);

	// Flush instruction cache
	// Only uses __builtin___clear_cache if GCC >= 4.3.3
	#if GCC_VERSION >= 40303
	__builtin___clear_cache(reinterpret_cast<void>(base), reinterpret_cast<void>(base + len));
	#else
	// Only warn if not Intel as Intel doesn't have cache flush instructions.
	#if !defined(__i386__) && !defined(__x86_64__)
	UNIMPLEMENTED(WARNING) << "cache flush";
	#endif
	#endif
	}

	void CommonCompilerTest::MakeExecutable(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;
	for (size_t i = 0; i < klass->NumDirectMethods(); i++) {
	MakeExecutable(klass->GetDirectMethod(i));
	}
	for (size_t i = 0; i < klass->NumVirtualMethods(); i++) {
	MakeExecutable(klass->GetVirtualMethod(i));
	}
	}

	// 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;
	}

	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_.reset(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);
	}
	}

	// TODO: make selectable
	Compiler::Kind compiler_kind = Compiler::kQuick;
	timer_.reset(new CumulativeLogger("Compilation times"));
	compiler_driver_.reset(new CompilerDriver(compiler_options_.get(),
	verification_results_.get(),
	method_inliner_map_.get(),
	compiler_kind, instruction_set,
	instruction_set_features_.get(),
	true,
	GetImageClasses(),
	GetCompiledClasses(),
	GetCompiledMethods(),
	2, true, true, "", timer_.get(), -1, ""));
	}
	// 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()));
	method_inliner_map_.reset(new DexFileToMethodInlinerMap);
	callbacks_.reset(new QuickCompilerCallbacks(verification_results_.get(),
	method_inliner_map_.get(),
	CompilerCallbacks::CallbackMode::kCompileApp));
	}

	void CommonCompilerTest::TearDown() {
	timer_.reset();
	compiler_driver_.reset();
	callbacks_.reset();
	method_inliner_map_.reset();
	verification_results_.reset();
	compiler_options_.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;
	for (size_t i = 0; i < klass->NumDirectMethods(); i++) {
	CompileMethod(klass->GetDirectMethod(i));
	}
	for (size_t i = 0; i < klass->NumVirtualMethods(); i++) {
	CompileMethod(klass->GetVirtualMethod(i));
	}
	}

	void CommonCompilerTest::CompileMethod(mirror::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;
	mirror::ArtMethod* method = klass->FindDirectMethod(method_name, signature);
	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;
	mirror::ArtMethod* method = klass->FindVirtualMethod(method_name, signature);
	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)100 * 1024 * 1024, // 100MB
	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