303 lines
11 KiB
C++
303 lines
11 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "optimizing_compiler.h"
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#include <fstream>
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#include <stdint.h>
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#include "builder.h"
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#include "code_generator.h"
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#include "compiler.h"
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#include "driver/compiler_driver.h"
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#include "driver/dex_compilation_unit.h"
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#include "graph_visualizer.h"
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#include "nodes.h"
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#include "register_allocator.h"
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#include "ssa_phi_elimination.h"
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#include "ssa_liveness_analysis.h"
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#include "utils/arena_allocator.h"
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namespace art {
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/**
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* Used by the code generator, to allocate the code in a vector.
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*/
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class CodeVectorAllocator FINAL : public CodeAllocator {
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public:
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CodeVectorAllocator() { }
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virtual uint8_t* Allocate(size_t size) {
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size_ = size;
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memory_.resize(size);
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return &memory_[0];
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}
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size_t GetSize() const { return size_; }
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const std::vector<uint8_t>& GetMemory() const { return memory_; }
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private:
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std::vector<uint8_t> memory_;
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size_t size_;
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DISALLOW_COPY_AND_ASSIGN(CodeVectorAllocator);
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};
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/**
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* If set to true, generates a file suitable for the c1visualizer tool and IRHydra.
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*/
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static bool kIsVisualizerEnabled = false;
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/**
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* Filter to apply to the visualizer. Methods whose name contain that filter will
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* be in the file.
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*/
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static const char* kStringFilter = "";
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class OptimizingCompiler FINAL : public Compiler {
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public:
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explicit OptimizingCompiler(CompilerDriver* driver);
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bool CanCompileMethod(uint32_t method_idx, const DexFile& dex_file, CompilationUnit* cu) const
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OVERRIDE;
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CompiledMethod* Compile(const DexFile::CodeItem* code_item,
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uint32_t access_flags,
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InvokeType invoke_type,
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uint16_t class_def_idx,
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uint32_t method_idx,
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jobject class_loader,
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const DexFile& dex_file) const OVERRIDE;
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CompiledMethod* TryCompile(const DexFile::CodeItem* code_item,
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uint32_t access_flags,
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InvokeType invoke_type,
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uint16_t class_def_idx,
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uint32_t method_idx,
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jobject class_loader,
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const DexFile& dex_file) const;
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// For the following methods we will use the fallback. This is a delegation pattern.
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CompiledMethod* JniCompile(uint32_t access_flags,
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uint32_t method_idx,
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const DexFile& dex_file) const OVERRIDE;
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uintptr_t GetEntryPointOf(mirror::ArtMethod* method) const OVERRIDE
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
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bool WriteElf(art::File* file,
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OatWriter* oat_writer,
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const std::vector<const art::DexFile*>& dex_files,
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const std::string& android_root,
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bool is_host) const OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
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Backend* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const OVERRIDE;
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void InitCompilationUnit(CompilationUnit& cu) const OVERRIDE;
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void Init() const OVERRIDE;
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void UnInit() const OVERRIDE;
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private:
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std::unique_ptr<std::ostream> visualizer_output_;
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// Delegate to another compiler in case the optimizing compiler cannot compile a method.
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// Currently the fallback is the quick compiler.
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std::unique_ptr<Compiler> delegate_;
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DISALLOW_COPY_AND_ASSIGN(OptimizingCompiler);
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};
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OptimizingCompiler::OptimizingCompiler(CompilerDriver* driver) : Compiler(driver, 100),
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delegate_(Create(driver, Compiler::Kind::kQuick)) {
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if (kIsVisualizerEnabled) {
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visualizer_output_.reset(new std::ofstream("art.cfg"));
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}
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}
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void OptimizingCompiler::Init() const {
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delegate_->Init();
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}
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void OptimizingCompiler::UnInit() const {
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delegate_->UnInit();
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}
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bool OptimizingCompiler::CanCompileMethod(uint32_t method_idx, const DexFile& dex_file,
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CompilationUnit* cu) const {
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return delegate_->CanCompileMethod(method_idx, dex_file, cu);
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}
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CompiledMethod* OptimizingCompiler::JniCompile(uint32_t access_flags,
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uint32_t method_idx,
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const DexFile& dex_file) const {
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return delegate_->JniCompile(access_flags, method_idx, dex_file);
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}
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uintptr_t OptimizingCompiler::GetEntryPointOf(mirror::ArtMethod* method) const {
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return delegate_->GetEntryPointOf(method);
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}
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bool OptimizingCompiler::WriteElf(art::File* file, OatWriter* oat_writer,
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const std::vector<const art::DexFile*>& dex_files,
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const std::string& android_root, bool is_host) const {
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return delegate_->WriteElf(file, oat_writer, dex_files, android_root, is_host);
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}
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Backend* OptimizingCompiler::GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const {
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return delegate_->GetCodeGenerator(cu, compilation_unit);
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}
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void OptimizingCompiler::InitCompilationUnit(CompilationUnit& cu) const {
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delegate_->InitCompilationUnit(cu);
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}
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CompiledMethod* OptimizingCompiler::TryCompile(const DexFile::CodeItem* code_item,
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uint32_t access_flags,
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InvokeType invoke_type,
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uint16_t class_def_idx,
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uint32_t method_idx,
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jobject class_loader,
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const DexFile& dex_file) const {
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InstructionSet instruction_set = GetCompilerDriver()->GetInstructionSet();
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// Always use the thumb2 assembler: some runtime functionality (like implicit stack
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// overflow checks) assume thumb2.
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if (instruction_set == kArm) {
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instruction_set = kThumb2;
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}
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// Do not attempt to compile on architectures we do not support.
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if (instruction_set != kX86 && instruction_set != kX86_64 && instruction_set != kThumb2) {
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return nullptr;
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}
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DexCompilationUnit dex_compilation_unit(
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nullptr, class_loader, art::Runtime::Current()->GetClassLinker(), dex_file, code_item,
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class_def_idx, method_idx, access_flags,
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GetCompilerDriver()->GetVerifiedMethod(&dex_file, method_idx));
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// For testing purposes, we put a special marker on method names that should be compiled
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// with this compiler. This makes sure we're not regressing.
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bool shouldCompile = dex_compilation_unit.GetSymbol().find("00024opt_00024") != std::string::npos;
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bool shouldOptimize =
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dex_compilation_unit.GetSymbol().find("00024reg_00024") != std::string::npos;
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ArenaPool pool;
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ArenaAllocator arena(&pool);
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HGraphBuilder builder(&arena, &dex_compilation_unit, &dex_file, GetCompilerDriver());
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HGraph* graph = builder.BuildGraph(*code_item);
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if (graph == nullptr) {
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if (shouldCompile) {
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LOG(FATAL) << "Could not build graph in optimizing compiler";
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}
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return nullptr;
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}
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CodeGenerator* codegen = CodeGenerator::Create(&arena, graph, instruction_set);
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if (codegen == nullptr) {
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if (shouldCompile) {
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LOG(FATAL) << "Could not find code generator for optimizing compiler";
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}
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return nullptr;
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}
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HGraphVisualizer visualizer(
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visualizer_output_.get(), graph, kStringFilter, *codegen, dex_compilation_unit);
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visualizer.DumpGraph("builder");
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CodeVectorAllocator allocator;
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if (RegisterAllocator::CanAllocateRegistersFor(*graph, instruction_set)) {
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graph->BuildDominatorTree();
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graph->TransformToSSA();
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visualizer.DumpGraph("ssa");
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graph->FindNaturalLoops();
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SsaRedundantPhiElimination(graph).Run();
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SsaDeadPhiElimination(graph).Run();
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SsaLivenessAnalysis liveness(*graph, codegen);
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liveness.Analyze();
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visualizer.DumpGraph(kLivenessPassName);
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RegisterAllocator register_allocator(graph->GetArena(), codegen, liveness);
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register_allocator.AllocateRegisters();
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visualizer.DumpGraph(kRegisterAllocatorPassName);
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codegen->CompileOptimized(&allocator);
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} else if (shouldOptimize && RegisterAllocator::Supports(instruction_set)) {
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LOG(FATAL) << "Could not allocate registers in optimizing compiler";
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} else {
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codegen->CompileBaseline(&allocator);
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// Run these phases to get some test coverage.
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graph->BuildDominatorTree();
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graph->TransformToSSA();
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visualizer.DumpGraph("ssa");
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graph->FindNaturalLoops();
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SsaLivenessAnalysis liveness(*graph, codegen);
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liveness.Analyze();
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visualizer.DumpGraph(kLivenessPassName);
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}
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std::vector<uint8_t> mapping_table;
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DefaultSrcMap src_mapping_table;
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codegen->BuildMappingTable(&mapping_table,
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GetCompilerDriver()->GetCompilerOptions().GetIncludeDebugSymbols() ?
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&src_mapping_table : nullptr);
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std::vector<uint8_t> vmap_table;
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codegen->BuildVMapTable(&vmap_table);
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std::vector<uint8_t> gc_map;
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codegen->BuildNativeGCMap(&gc_map, dex_compilation_unit);
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return CompiledMethod::SwapAllocCompiledMethod(GetCompilerDriver(),
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instruction_set,
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ArrayRef<const uint8_t>(allocator.GetMemory()),
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codegen->GetFrameSize(),
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codegen->GetCoreSpillMask(),
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0, /* FPR spill mask, unused */
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&src_mapping_table,
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ArrayRef<const uint8_t>(mapping_table),
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ArrayRef<const uint8_t>(vmap_table),
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ArrayRef<const uint8_t>(gc_map),
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ArrayRef<const uint8_t>());
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}
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CompiledMethod* OptimizingCompiler::Compile(const DexFile::CodeItem* code_item,
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uint32_t access_flags,
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InvokeType invoke_type,
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uint16_t class_def_idx,
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uint32_t method_idx,
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jobject class_loader,
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const DexFile& dex_file) const {
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CompiledMethod* method = TryCompile(code_item, access_flags, invoke_type, class_def_idx,
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method_idx, class_loader, dex_file);
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if (method != nullptr) {
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return method;
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}
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return delegate_->Compile(code_item, access_flags, invoke_type, class_def_idx, method_idx,
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class_loader, dex_file);
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}
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Compiler* CreateOptimizingCompiler(CompilerDriver* driver) {
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return new OptimizingCompiler(driver);
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}
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} // namespace art
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