/*
 * Copyright (C) 2014 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 "optimizing_compiler.h"

#include <fstream>
#include <memory>
#include <sstream>

#include <stdint.h>

#include "art_method-inl.h"
#include "base/arena_allocator.h"
#include "base/arena_containers.h"
#include "base/dumpable.h"
#include "base/macros.h"
#include "base/mutex.h"
#include "base/scoped_arena_allocator.h"
#include "base/timing_logger.h"
#include "builder.h"
#include "code_generator.h"
#include "compiled_method.h"
#include "compiler.h"
#include "debug/elf_debug_writer.h"
#include "debug/method_debug_info.h"
#include "dex/verification_results.h"
#include "dex/verified_method.h"
#include "dex_file_types.h"
#include "driver/compiler_driver-inl.h"
#include "driver/compiler_options.h"
#include "driver/dex_compilation_unit.h"
#include "graph_checker.h"
#include "graph_visualizer.h"
#include "inliner.h"
#include "jit/debugger_interface.h"
#include "jit/jit.h"
#include "jit/jit_code_cache.h"
#include "jit/jit_logger.h"
#include "jni/quick/jni_compiler.h"
#include "linker/linker_patch.h"
#include "nodes.h"
#include "oat_quick_method_header.h"
#include "prepare_for_register_allocation.h"
#include "reference_type_propagation.h"
#include "register_allocator_linear_scan.h"
#include "select_generator.h"
#include "ssa_builder.h"
#include "ssa_liveness_analysis.h"
#include "ssa_phi_elimination.h"
#include "utils/assembler.h"
#include "verifier/verifier_compiler_binding.h"

namespace art {

static constexpr size_t kArenaAllocatorMemoryReportThreshold = 8 * MB;

static constexpr const char* kPassNameSeparator = "$";

/**
 * Used by the code generator, to allocate the code in a vector.
 */
class CodeVectorAllocator FINAL : public CodeAllocator {
 public:
  explicit CodeVectorAllocator(ArenaAllocator* allocator)
      : memory_(allocator->Adapter(kArenaAllocCodeBuffer)),
        size_(0) {}

  virtual uint8_t* Allocate(size_t size) {
    size_ = size;
    memory_.resize(size);
    return &memory_[0];
  }

  size_t GetSize() const { return size_; }
  const ArenaVector<uint8_t>& GetMemory() const { return memory_; }
  uint8_t* GetData() { return memory_.data(); }

 private:
  ArenaVector<uint8_t> memory_;
  size_t size_;

  DISALLOW_COPY_AND_ASSIGN(CodeVectorAllocator);
};

/**
 * Filter to apply to the visualizer. Methods whose name contain that filter will
 * be dumped.
 */
static constexpr const char kStringFilter[] = "";

class PassScope;

class PassObserver : public ValueObject {
 public:
  PassObserver(HGraph* graph,
               CodeGenerator* codegen,
               std::ostream* visualizer_output,
               CompilerDriver* compiler_driver,
               Mutex& dump_mutex)
      : graph_(graph),
        cached_method_name_(),
        timing_logger_enabled_(compiler_driver->GetDumpPasses()),
        timing_logger_(timing_logger_enabled_ ? GetMethodName() : "", true, true),
        disasm_info_(graph->GetAllocator()),
        visualizer_oss_(),
        visualizer_output_(visualizer_output),
        visualizer_enabled_(!compiler_driver->GetCompilerOptions().GetDumpCfgFileName().empty()),
        visualizer_(&visualizer_oss_, graph, *codegen),
        visualizer_dump_mutex_(dump_mutex),
        graph_in_bad_state_(false) {
    if (timing_logger_enabled_ || visualizer_enabled_) {
      if (!IsVerboseMethod(compiler_driver, GetMethodName())) {
        timing_logger_enabled_ = visualizer_enabled_ = false;
      }
      if (visualizer_enabled_) {
        visualizer_.PrintHeader(GetMethodName());
        codegen->SetDisassemblyInformation(&disasm_info_);
      }
    }
  }

  ~PassObserver() {
    if (timing_logger_enabled_) {
      LOG(INFO) << "TIMINGS " << GetMethodName();
      LOG(INFO) << Dumpable<TimingLogger>(timing_logger_);
    }
    DCHECK(visualizer_oss_.str().empty());
  }

  void DumpDisassembly() REQUIRES(!visualizer_dump_mutex_) {
    if (visualizer_enabled_) {
      visualizer_.DumpGraphWithDisassembly();
      FlushVisualizer();
    }
  }

  void SetGraphInBadState() { graph_in_bad_state_ = true; }

  const char* GetMethodName() {
    // PrettyMethod() is expensive, so we delay calling it until we actually have to.
    if (cached_method_name_.empty()) {
      cached_method_name_ = graph_->GetDexFile().PrettyMethod(graph_->GetMethodIdx());
    }
    return cached_method_name_.c_str();
  }

 private:
  void StartPass(const char* pass_name) REQUIRES(!visualizer_dump_mutex_) {
    VLOG(compiler) << "Starting pass: " << pass_name;
    // Dump graph first, then start timer.
    if (visualizer_enabled_) {
      visualizer_.DumpGraph(pass_name, /* is_after_pass */ false, graph_in_bad_state_);
      FlushVisualizer();
    }
    if (timing_logger_enabled_) {
      timing_logger_.StartTiming(pass_name);
    }
  }

  void FlushVisualizer() REQUIRES(!visualizer_dump_mutex_) {
    MutexLock mu(Thread::Current(), visualizer_dump_mutex_);
    *visualizer_output_ << visualizer_oss_.str();
    visualizer_output_->flush();
    visualizer_oss_.str("");
    visualizer_oss_.clear();
  }

  void EndPass(const char* pass_name) REQUIRES(!visualizer_dump_mutex_) {
    // Pause timer first, then dump graph.
    if (timing_logger_enabled_) {
      timing_logger_.EndTiming();
    }
    if (visualizer_enabled_) {
      visualizer_.DumpGraph(pass_name, /* is_after_pass */ true, graph_in_bad_state_);
      FlushVisualizer();
    }

    // Validate the HGraph if running in debug mode.
    if (kIsDebugBuild) {
      if (!graph_in_bad_state_) {
        GraphChecker checker(graph_);
        checker.Run();
        if (!checker.IsValid()) {
          LOG(FATAL) << "Error after " << pass_name << ": " << Dumpable<GraphChecker>(checker);
        }
      }
    }
  }

  static bool IsVerboseMethod(CompilerDriver* compiler_driver, const char* method_name) {
    // Test an exact match to --verbose-methods. If verbose-methods is set, this overrides an
    // empty kStringFilter matching all methods.
    if (compiler_driver->GetCompilerOptions().HasVerboseMethods()) {
      return compiler_driver->GetCompilerOptions().IsVerboseMethod(method_name);
    }

    // Test the kStringFilter sub-string. constexpr helper variable to silence unreachable-code
    // warning when the string is empty.
    constexpr bool kStringFilterEmpty = arraysize(kStringFilter) <= 1;
    if (kStringFilterEmpty || strstr(method_name, kStringFilter) != nullptr) {
      return true;
    }

    return false;
  }

  HGraph* const graph_;

  std::string cached_method_name_;

  bool timing_logger_enabled_;
  TimingLogger timing_logger_;

  DisassemblyInformation disasm_info_;

  std::ostringstream visualizer_oss_;
  std::ostream* visualizer_output_;
  bool visualizer_enabled_;
  HGraphVisualizer visualizer_;
  Mutex& visualizer_dump_mutex_;

  // Flag to be set by the compiler if the pass failed and the graph is not
  // expected to validate.
  bool graph_in_bad_state_;

  friend PassScope;

  DISALLOW_COPY_AND_ASSIGN(PassObserver);
};

class PassScope : public ValueObject {
 public:
  PassScope(const char *pass_name, PassObserver* pass_observer)
      : pass_name_(pass_name),
        pass_observer_(pass_observer) {
    pass_observer_->StartPass(pass_name_);
  }

  ~PassScope() {
    pass_observer_->EndPass(pass_name_);
  }

 private:
  const char* const pass_name_;
  PassObserver* const pass_observer_;
};

class OptimizingCompiler FINAL : public Compiler {
 public:
  explicit OptimizingCompiler(CompilerDriver* driver);
  ~OptimizingCompiler() OVERRIDE;

  bool CanCompileMethod(uint32_t method_idx, const DexFile& dex_file) const OVERRIDE;

  CompiledMethod* Compile(const DexFile::CodeItem* code_item,
                          uint32_t access_flags,
                          InvokeType invoke_type,
                          uint16_t class_def_idx,
                          uint32_t method_idx,
                          Handle<mirror::ClassLoader> class_loader,
                          const DexFile& dex_file,
                          Handle<mirror::DexCache> dex_cache) const OVERRIDE;

  CompiledMethod* JniCompile(uint32_t access_flags,
                             uint32_t method_idx,
                             const DexFile& dex_file,
                             Handle<mirror::DexCache> dex_cache) const OVERRIDE;

  uintptr_t GetEntryPointOf(ArtMethod* method) const OVERRIDE
      REQUIRES_SHARED(Locks::mutator_lock_) {
    return reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCodePtrSize(
        InstructionSetPointerSize(GetCompilerDriver()->GetInstructionSet())));
  }

  void Init() OVERRIDE;

  void UnInit() const OVERRIDE;

  bool JitCompile(Thread* self,
                  jit::JitCodeCache* code_cache,
                  ArtMethod* method,
                  bool osr,
                  jit::JitLogger* jit_logger)
      OVERRIDE
      REQUIRES_SHARED(Locks::mutator_lock_);

 private:
  void RunOptimizations(HGraph* graph,
                        CodeGenerator* codegen,
                        const DexCompilationUnit& dex_compilation_unit,
                        PassObserver* pass_observer,
                        VariableSizedHandleScope* handles,
                        const OptimizationDef definitions[],
                        size_t length) const {
    // Convert definitions to optimization passes.
    ArenaVector<HOptimization*> optimizations = ConstructOptimizations(
        definitions,
        length,
        graph->GetAllocator(),
        graph,
        compilation_stats_.get(),
        codegen,
        GetCompilerDriver(),
        dex_compilation_unit,
        handles);
    DCHECK_EQ(length, optimizations.size());
    // Run the optimization passes one by one.
    for (size_t i = 0; i < length; ++i) {
      PassScope scope(optimizations[i]->GetPassName(), pass_observer);
      optimizations[i]->Run();
    }
  }

  template <size_t length> void RunOptimizations(
      HGraph* graph,
      CodeGenerator* codegen,
      const DexCompilationUnit& dex_compilation_unit,
      PassObserver* pass_observer,
      VariableSizedHandleScope* handles,
      const OptimizationDef (&definitions)[length]) const {
    RunOptimizations(
        graph, codegen, dex_compilation_unit, pass_observer, handles, definitions, length);
  }

  void RunOptimizations(HGraph* graph,
                        CodeGenerator* codegen,
                        const DexCompilationUnit& dex_compilation_unit,
                        PassObserver* pass_observer,
                        VariableSizedHandleScope* handles) const;

 private:
  // Create a 'CompiledMethod' for an optimized graph.
  CompiledMethod* Emit(ArenaAllocator* allocator,
                       CodeVectorAllocator* code_allocator,
                       CodeGenerator* codegen,
                       const DexFile::CodeItem* item) const;

  // Try compiling a method and return the code generator used for
  // compiling it.
  // This method:
  // 1) Builds the graph. Returns null if it failed to build it.
  // 2) Transforms the graph to SSA. Returns null if it failed.
  // 3) Runs optimizations on the graph, including register allocator.
  // 4) Generates code with the `code_allocator` provided.
  CodeGenerator* TryCompile(ArenaAllocator* allocator,
                            ArenaStack* arena_stack,
                            CodeVectorAllocator* code_allocator,
                            const DexCompilationUnit& dex_compilation_unit,
                            ArtMethod* method,
                            bool osr,
                            VariableSizedHandleScope* handles) const;

  CodeGenerator* TryCompileIntrinsic(ArenaAllocator* allocator,
                                     ArenaStack* arena_stack,
                                     CodeVectorAllocator* code_allocator,
                                     const DexCompilationUnit& dex_compilation_unit,
                                     ArtMethod* method,
                                     VariableSizedHandleScope* handles) const;

  void MaybeRunInliner(HGraph* graph,
                       CodeGenerator* codegen,
                       const DexCompilationUnit& dex_compilation_unit,
                       PassObserver* pass_observer,
                       VariableSizedHandleScope* handles) const;

  void RunArchOptimizations(HGraph* graph,
                            CodeGenerator* codegen,
                            const DexCompilationUnit& dex_compilation_unit,
                            PassObserver* pass_observer,
                            VariableSizedHandleScope* handles) const;

  std::unique_ptr<OptimizingCompilerStats> compilation_stats_;

  std::unique_ptr<std::ostream> visualizer_output_;

  mutable Mutex dump_mutex_;  // To synchronize visualizer writing.

  DISALLOW_COPY_AND_ASSIGN(OptimizingCompiler);
};

static const int kMaximumCompilationTimeBeforeWarning = 100; /* ms */

OptimizingCompiler::OptimizingCompiler(CompilerDriver* driver)
    : Compiler(driver, kMaximumCompilationTimeBeforeWarning),
      dump_mutex_("Visualizer dump lock") {}

void OptimizingCompiler::Init() {
  // Enable C1visualizer output. Must be done in Init() because the compiler
  // driver is not fully initialized when passed to the compiler's constructor.
  CompilerDriver* driver = GetCompilerDriver();
  const std::string cfg_file_name = driver->GetCompilerOptions().GetDumpCfgFileName();
  if (!cfg_file_name.empty()) {
    std::ios_base::openmode cfg_file_mode =
        driver->GetCompilerOptions().GetDumpCfgAppend() ? std::ofstream::app : std::ofstream::out;
    visualizer_output_.reset(new std::ofstream(cfg_file_name, cfg_file_mode));
  }
  if (driver->GetDumpStats()) {
    compilation_stats_.reset(new OptimizingCompilerStats());
  }
}

void OptimizingCompiler::UnInit() const {
}

OptimizingCompiler::~OptimizingCompiler() {
  if (compilation_stats_.get() != nullptr) {
    compilation_stats_->Log();
  }
}

bool OptimizingCompiler::CanCompileMethod(uint32_t method_idx ATTRIBUTE_UNUSED,
                                          const DexFile& dex_file ATTRIBUTE_UNUSED) const {
  return true;
}

static bool IsInstructionSetSupported(InstructionSet instruction_set) {
  return instruction_set == InstructionSet::kArm
      || instruction_set == InstructionSet::kArm64
      || instruction_set == InstructionSet::kThumb2
      || instruction_set == InstructionSet::kMips
      || instruction_set == InstructionSet::kMips64
      || instruction_set == InstructionSet::kX86
      || instruction_set == InstructionSet::kX86_64;
}

void OptimizingCompiler::MaybeRunInliner(HGraph* graph,
                                         CodeGenerator* codegen,
                                         const DexCompilationUnit& dex_compilation_unit,
                                         PassObserver* pass_observer,
                                         VariableSizedHandleScope* handles) const {
  const CompilerOptions& compiler_options = GetCompilerDriver()->GetCompilerOptions();
  bool should_inline = (compiler_options.GetInlineMaxCodeUnits() > 0);
  if (!should_inline) {
    return;
  }
  OptimizationDef optimizations[] = {
    OptDef(OptimizationPass::kInliner)
  };
  RunOptimizations(graph,
                   codegen,
                   dex_compilation_unit,
                   pass_observer,
                   handles,
                   optimizations);
}

void OptimizingCompiler::RunArchOptimizations(HGraph* graph,
                                              CodeGenerator* codegen,
                                              const DexCompilationUnit& dex_compilation_unit,
                                              PassObserver* pass_observer,
                                              VariableSizedHandleScope* handles) const {
  switch (GetCompilerDriver()->GetInstructionSet()) {
#if defined(ART_ENABLE_CODEGEN_arm)
    case InstructionSet::kThumb2:
    case InstructionSet::kArm: {
      OptimizationDef arm_optimizations[] = {
        OptDef(OptimizationPass::kInstructionSimplifierArm),
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
        OptDef(OptimizationPass::kScheduling)
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       arm_optimizations);
      break;
    }
#endif
#ifdef ART_ENABLE_CODEGEN_arm64
    case InstructionSet::kArm64: {
      OptimizationDef arm64_optimizations[] = {
        OptDef(OptimizationPass::kInstructionSimplifierArm64),
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
        OptDef(OptimizationPass::kScheduling)
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       arm64_optimizations);
      break;
    }
#endif
#ifdef ART_ENABLE_CODEGEN_mips
    case InstructionSet::kMips: {
      OptimizationDef mips_optimizations[] = {
        OptDef(OptimizationPass::kInstructionSimplifierMips),
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
        OptDef(OptimizationPass::kPcRelativeFixupsMips)
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       mips_optimizations);
      break;
    }
#endif
#ifdef ART_ENABLE_CODEGEN_mips64
    case InstructionSet::kMips64: {
      OptimizationDef mips64_optimizations[] = {
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch")
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       mips64_optimizations);
      break;
    }
#endif
#ifdef ART_ENABLE_CODEGEN_x86
    case InstructionSet::kX86: {
      OptimizationDef x86_optimizations[] = {
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
        OptDef(OptimizationPass::kPcRelativeFixupsX86),
        OptDef(OptimizationPass::kX86MemoryOperandGeneration)
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       x86_optimizations);
      break;
    }
#endif
#ifdef ART_ENABLE_CODEGEN_x86_64
    case InstructionSet::kX86_64: {
      OptimizationDef x86_64_optimizations[] = {
        OptDef(OptimizationPass::kSideEffectsAnalysis),
        OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
        OptDef(OptimizationPass::kX86MemoryOperandGeneration)
      };
      RunOptimizations(graph,
                       codegen,
                       dex_compilation_unit,
                       pass_observer,
                       handles,
                       x86_64_optimizations);
      break;
    }
#endif
    default:
      break;
  }
}

NO_INLINE  // Avoid increasing caller's frame size by large stack-allocated objects.
static void AllocateRegisters(HGraph* graph,
                              CodeGenerator* codegen,
                              PassObserver* pass_observer,
                              RegisterAllocator::Strategy strategy,
                              OptimizingCompilerStats* stats) {
  {
    PassScope scope(PrepareForRegisterAllocation::kPrepareForRegisterAllocationPassName,
                    pass_observer);
    PrepareForRegisterAllocation(graph, stats).Run();
  }
  // Use local allocator shared by SSA liveness analysis and register allocator.
  // (Register allocator creates new objects in the liveness data.)
  ScopedArenaAllocator local_allocator(graph->GetArenaStack());
  SsaLivenessAnalysis liveness(graph, codegen, &local_allocator);
  {
    PassScope scope(SsaLivenessAnalysis::kLivenessPassName, pass_observer);
    liveness.Analyze();
  }
  {
    PassScope scope(RegisterAllocator::kRegisterAllocatorPassName, pass_observer);
    std::unique_ptr<RegisterAllocator> register_allocator =
        RegisterAllocator::Create(&local_allocator, codegen, liveness, strategy);
    register_allocator->AllocateRegisters();
  }
}

// Strip pass name suffix to get optimization name.
static std::string ConvertPassNameToOptimizationName(const std::string& pass_name) {
  size_t pos = pass_name.find(kPassNameSeparator);
  return pos == std::string::npos ? pass_name : pass_name.substr(0, pos);
}

void OptimizingCompiler::RunOptimizations(HGraph* graph,
                                          CodeGenerator* codegen,
                                          const DexCompilationUnit& dex_compilation_unit,
                                          PassObserver* pass_observer,
                                          VariableSizedHandleScope* handles) const {
  const std::vector<std::string>* pass_names =
      GetCompilerDriver()->GetCompilerOptions().GetPassesToRun();
  if (pass_names != nullptr) {
    // If passes were defined on command-line, build the optimization
    // passes and run these instead of the built-in optimizations.
    const size_t length = pass_names->size();
    std::vector<OptimizationDef> optimizations;
    for (const std::string& pass_name : *pass_names) {
      std::string opt_name = ConvertPassNameToOptimizationName(pass_name);
      optimizations.push_back(OptDef(OptimizationPassByName(opt_name.c_str()), pass_name.c_str()));
    }
    RunOptimizations(graph,
                     codegen,
                     dex_compilation_unit,
                     pass_observer,
                     handles,
                     optimizations.data(),
                     length);
    return;
  }

  OptimizationDef optimizations1[] = {
    OptDef(OptimizationPass::kIntrinsicsRecognizer),
    OptDef(OptimizationPass::kSharpening),
    OptDef(OptimizationPass::kConstantFolding),
    OptDef(OptimizationPass::kInstructionSimplifier),
    OptDef(OptimizationPass::kDeadCodeElimination, "dead_code_elimination$initial")
  };
  RunOptimizations(graph,
                   codegen,
                   dex_compilation_unit,
                   pass_observer,
                   handles,
                   optimizations1);

  MaybeRunInliner(graph, codegen, dex_compilation_unit, pass_observer, handles);

  OptimizationDef optimizations2[] = {
    // SelectGenerator depends on the InstructionSimplifier removing
    // redundant suspend checks to recognize empty blocks.
    OptDef(OptimizationPass::kSelectGenerator),
    // TODO: if we don't inline we can also skip fold2.
    OptDef(OptimizationPass::kConstantFolding,       "constant_folding$after_inlining"),
    OptDef(OptimizationPass::kInstructionSimplifier, "instruction_simplifier$after_inlining"),
    OptDef(OptimizationPass::kDeadCodeElimination,   "dead_code_elimination$after_inlining"),
    OptDef(OptimizationPass::kSideEffectsAnalysis,   "side_effects$before_gvn"),
    OptDef(OptimizationPass::kGlobalValueNumbering),
    OptDef(OptimizationPass::kInvariantCodeMotion),
    OptDef(OptimizationPass::kInductionVarAnalysis),
    OptDef(OptimizationPass::kBoundsCheckElimination),
    OptDef(OptimizationPass::kLoopOptimization),
    // Evaluates code generated by dynamic bce.
    OptDef(OptimizationPass::kConstantFolding,       "constant_folding$after_bce"),
    OptDef(OptimizationPass::kInstructionSimplifier, "instruction_simplifier$after_bce"),
    OptDef(OptimizationPass::kSideEffectsAnalysis,   "side_effects$before_lse"),
    OptDef(OptimizationPass::kLoadStoreAnalysis),
    OptDef(OptimizationPass::kLoadStoreElimination),
    OptDef(OptimizationPass::kCHAGuardOptimization),
    OptDef(OptimizationPass::kDeadCodeElimination,   "dead_code_elimination$final"),
    OptDef(OptimizationPass::kCodeSinking),
    // The codegen has a few assumptions that only the instruction simplifier
    // can satisfy. For example, the code generator does not expect to see a
    // HTypeConversion from a type to the same type.
    OptDef(OptimizationPass::kInstructionSimplifier, "instruction_simplifier$before_codegen"),
    // Eliminate constructor fences after code sinking to avoid
    // complicated sinking logic to split a fence with many inputs.
    OptDef(OptimizationPass::kConstructorFenceRedundancyElimination)
  };
  RunOptimizations(graph,
                   codegen,
                   dex_compilation_unit,
                   pass_observer,
                   handles,
                   optimizations2);

  RunArchOptimizations(graph, codegen, dex_compilation_unit, pass_observer, handles);
}

static ArenaVector<linker::LinkerPatch> EmitAndSortLinkerPatches(CodeGenerator* codegen) {
  ArenaVector<linker::LinkerPatch> linker_patches(codegen->GetGraph()->GetAllocator()->Adapter());
  codegen->EmitLinkerPatches(&linker_patches);

  // Sort patches by literal offset. Required for .oat_patches encoding.
  std::sort(linker_patches.begin(), linker_patches.end(),
            [](const linker::LinkerPatch& lhs, const linker::LinkerPatch& rhs) {
    return lhs.LiteralOffset() < rhs.LiteralOffset();
  });

  return linker_patches;
}

CompiledMethod* OptimizingCompiler::Emit(ArenaAllocator* allocator,
                                         CodeVectorAllocator* code_allocator,
                                         CodeGenerator* codegen,
                                         const DexFile::CodeItem* code_item_for_osr_check) const {
  ArenaVector<linker::LinkerPatch> linker_patches = EmitAndSortLinkerPatches(codegen);
  ArenaVector<uint8_t> stack_map(allocator->Adapter(kArenaAllocStackMaps));
  ArenaVector<uint8_t> method_info(allocator->Adapter(kArenaAllocStackMaps));
  size_t stack_map_size = 0;
  size_t method_info_size = 0;
  codegen->ComputeStackMapAndMethodInfoSize(&stack_map_size, &method_info_size);
  stack_map.resize(stack_map_size);
  method_info.resize(method_info_size);
  codegen->BuildStackMaps(MemoryRegion(stack_map.data(), stack_map.size()),
                          MemoryRegion(method_info.data(), method_info.size()),
                          code_item_for_osr_check);

  CompiledMethod* compiled_method = CompiledMethod::SwapAllocCompiledMethod(
      GetCompilerDriver(),
      codegen->GetInstructionSet(),
      ArrayRef<const uint8_t>(code_allocator->GetMemory()),
      // Follow Quick's behavior and set the frame size to zero if it is
      // considered "empty" (see the definition of
      // art::CodeGenerator::HasEmptyFrame).
      codegen->HasEmptyFrame() ? 0 : codegen->GetFrameSize(),
      codegen->GetCoreSpillMask(),
      codegen->GetFpuSpillMask(),
      ArrayRef<const uint8_t>(method_info),
      ArrayRef<const uint8_t>(stack_map),
      ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data()),
      ArrayRef<const linker::LinkerPatch>(linker_patches));

  return compiled_method;
}

CodeGenerator* OptimizingCompiler::TryCompile(ArenaAllocator* allocator,
                                              ArenaStack* arena_stack,
                                              CodeVectorAllocator* code_allocator,
                                              const DexCompilationUnit& dex_compilation_unit,
                                              ArtMethod* method,
                                              bool osr,
                                              VariableSizedHandleScope* handles) const {
  MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kAttemptBytecodeCompilation);
  CompilerDriver* compiler_driver = GetCompilerDriver();
  InstructionSet instruction_set = compiler_driver->GetInstructionSet();
  const DexFile& dex_file = *dex_compilation_unit.GetDexFile();
  uint32_t method_idx = dex_compilation_unit.GetDexMethodIndex();
  const DexFile::CodeItem* code_item = dex_compilation_unit.GetCodeItem();

  // Always use the Thumb-2 assembler: some runtime functionality
  // (like implicit stack overflow checks) assume Thumb-2.
  DCHECK_NE(instruction_set, InstructionSet::kArm);

  // Do not attempt to compile on architectures we do not support.
  if (!IsInstructionSetSupported(instruction_set)) {
    MaybeRecordStat(compilation_stats_.get(),
                    MethodCompilationStat::kNotCompiledUnsupportedIsa);
    return nullptr;
  }

  if (Compiler::IsPathologicalCase(*code_item, method_idx, dex_file)) {
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kNotCompiledPathological);
    return nullptr;
  }

  // Implementation of the space filter: do not compile a code item whose size in
  // code units is bigger than 128.
  static constexpr size_t kSpaceFilterOptimizingThreshold = 128;
  const CompilerOptions& compiler_options = compiler_driver->GetCompilerOptions();
  if ((compiler_options.GetCompilerFilter() == CompilerFilter::kSpace)
      && (code_item->insns_size_in_code_units_ > kSpaceFilterOptimizingThreshold)) {
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kNotCompiledSpaceFilter);
    return nullptr;
  }

  HGraph* graph = new (allocator) HGraph(
      allocator,
      arena_stack,
      dex_file,
      method_idx,
      compiler_driver->GetInstructionSet(),
      kInvalidInvokeType,
      compiler_driver->GetCompilerOptions().GetDebuggable(),
      osr);

  const uint8_t* interpreter_metadata = nullptr;
  // For AOT compilation, we may not get a method, for example if its class is erroneous.
  // JIT should always have a method.
  DCHECK(Runtime::Current()->IsAotCompiler() || method != nullptr);
  if (method != nullptr) {
    graph->SetArtMethod(method);
    ScopedObjectAccess soa(Thread::Current());
    interpreter_metadata = method->GetQuickenedInfo();
  }

  std::unique_ptr<CodeGenerator> codegen(
      CodeGenerator::Create(graph,
                            instruction_set,
                            *compiler_driver->GetInstructionSetFeatures(),
                            compiler_driver->GetCompilerOptions(),
                            compilation_stats_.get()));
  if (codegen.get() == nullptr) {
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kNotCompiledNoCodegen);
    return nullptr;
  }
  codegen->GetAssembler()->cfi().SetEnabled(
      compiler_driver->GetCompilerOptions().GenerateAnyDebugInfo());

  PassObserver pass_observer(graph,
                             codegen.get(),
                             visualizer_output_.get(),
                             compiler_driver,
                             dump_mutex_);

  {
    VLOG(compiler) << "Building " << pass_observer.GetMethodName();
    PassScope scope(HGraphBuilder::kBuilderPassName, &pass_observer);
    HGraphBuilder builder(graph,
                          code_item,
                          &dex_compilation_unit,
                          &dex_compilation_unit,
                          compiler_driver,
                          codegen.get(),
                          compilation_stats_.get(),
                          interpreter_metadata,
                          handles);
    GraphAnalysisResult result = builder.BuildGraph();
    if (result != kAnalysisSuccess) {
      switch (result) {
        case kAnalysisSkipped: {
          MaybeRecordStat(compilation_stats_.get(),
                          MethodCompilationStat::kNotCompiledSkipped);
        }
          break;
        case kAnalysisInvalidBytecode: {
          MaybeRecordStat(compilation_stats_.get(),
                          MethodCompilationStat::kNotCompiledInvalidBytecode);
        }
          break;
        case kAnalysisFailThrowCatchLoop: {
          MaybeRecordStat(compilation_stats_.get(),
                          MethodCompilationStat::kNotCompiledThrowCatchLoop);
        }
          break;
        case kAnalysisFailAmbiguousArrayOp: {
          MaybeRecordStat(compilation_stats_.get(),
                          MethodCompilationStat::kNotCompiledAmbiguousArrayOp);
        }
          break;
        case kAnalysisSuccess:
          UNREACHABLE();
      }
      pass_observer.SetGraphInBadState();
      return nullptr;
    }
  }

  RunOptimizations(graph,
                   codegen.get(),
                   dex_compilation_unit,
                   &pass_observer,
                   handles);

  RegisterAllocator::Strategy regalloc_strategy =
    compiler_options.GetRegisterAllocationStrategy();
  AllocateRegisters(graph,
                    codegen.get(),
                    &pass_observer,
                    regalloc_strategy,
                    compilation_stats_.get());

  codegen->Compile(code_allocator);
  pass_observer.DumpDisassembly();

  MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kCompiledBytecode);
  return codegen.release();
}

CodeGenerator* OptimizingCompiler::TryCompileIntrinsic(
    ArenaAllocator* allocator,
    ArenaStack* arena_stack,
    CodeVectorAllocator* code_allocator,
    const DexCompilationUnit& dex_compilation_unit,
    ArtMethod* method,
    VariableSizedHandleScope* handles) const {
  MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kAttemptIntrinsicCompilation);
  CompilerDriver* compiler_driver = GetCompilerDriver();
  InstructionSet instruction_set = compiler_driver->GetInstructionSet();
  const DexFile& dex_file = *dex_compilation_unit.GetDexFile();
  uint32_t method_idx = dex_compilation_unit.GetDexMethodIndex();

  // Always use the Thumb-2 assembler: some runtime functionality
  // (like implicit stack overflow checks) assume Thumb-2.
  DCHECK_NE(instruction_set, InstructionSet::kArm);

  // Do not attempt to compile on architectures we do not support.
  if (!IsInstructionSetSupported(instruction_set)) {
    return nullptr;
  }

  HGraph* graph = new (allocator) HGraph(
      allocator,
      arena_stack,
      dex_file,
      method_idx,
      compiler_driver->GetInstructionSet(),
      kInvalidInvokeType,
      compiler_driver->GetCompilerOptions().GetDebuggable(),
      /* osr */ false);

  DCHECK(Runtime::Current()->IsAotCompiler());
  DCHECK(method != nullptr);
  graph->SetArtMethod(method);

  std::unique_ptr<CodeGenerator> codegen(
      CodeGenerator::Create(graph,
                            instruction_set,
                            *compiler_driver->GetInstructionSetFeatures(),
                            compiler_driver->GetCompilerOptions(),
                            compilation_stats_.get()));
  if (codegen.get() == nullptr) {
    return nullptr;
  }
  codegen->GetAssembler()->cfi().SetEnabled(
      compiler_driver->GetCompilerOptions().GenerateAnyDebugInfo());

  PassObserver pass_observer(graph,
                             codegen.get(),
                             visualizer_output_.get(),
                             compiler_driver,
                             dump_mutex_);

  {
    VLOG(compiler) << "Building intrinsic graph " << pass_observer.GetMethodName();
    PassScope scope(HGraphBuilder::kBuilderPassName, &pass_observer);
    HGraphBuilder builder(graph,
                          /* code_item */ nullptr,
                          &dex_compilation_unit,
                          &dex_compilation_unit,
                          compiler_driver,
                          codegen.get(),
                          compilation_stats_.get(),
                          /* interpreter_metadata */ nullptr,
                          handles);
    builder.BuildIntrinsicGraph(method);
  }

  OptimizationDef optimizations[] = {
    OptDef(OptimizationPass::kIntrinsicsRecognizer),
    // Some intrinsics are converted to HIR by the simplifier and the codegen also
    // has a few assumptions that only the instruction simplifier can satisfy.
    OptDef(OptimizationPass::kInstructionSimplifier),
  };
  RunOptimizations(graph,
                   codegen.get(),
                   dex_compilation_unit,
                   &pass_observer,
                   handles,
                   optimizations);

  RunArchOptimizations(graph, codegen.get(), dex_compilation_unit, &pass_observer, handles);

  AllocateRegisters(graph,
                    codegen.get(),
                    &pass_observer,
                    compiler_driver->GetCompilerOptions().GetRegisterAllocationStrategy(),
                    compilation_stats_.get());
  if (!codegen->IsLeafMethod()) {
    VLOG(compiler) << "Intrinsic method is not leaf: " << method->GetIntrinsic()
        << " " << graph->PrettyMethod();
    return nullptr;
  }

  codegen->Compile(code_allocator);
  pass_observer.DumpDisassembly();

  VLOG(compiler) << "Compiled intrinsic: " << method->GetIntrinsic()
      << " " << graph->PrettyMethod();
  MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kCompiledIntrinsic);
  return codegen.release();
}

CompiledMethod* OptimizingCompiler::Compile(const DexFile::CodeItem* code_item,
                                            uint32_t access_flags,
                                            InvokeType invoke_type,
                                            uint16_t class_def_idx,
                                            uint32_t method_idx,
                                            Handle<mirror::ClassLoader> jclass_loader,
                                            const DexFile& dex_file,
                                            Handle<mirror::DexCache> dex_cache) const {
  CompilerDriver* compiler_driver = GetCompilerDriver();
  CompiledMethod* compiled_method = nullptr;
  Runtime* runtime = Runtime::Current();
  DCHECK(runtime->IsAotCompiler());
  const VerifiedMethod* verified_method = compiler_driver->GetVerifiedMethod(&dex_file, method_idx);
  DCHECK(!verified_method->HasRuntimeThrow());
  if (compiler_driver->IsMethodVerifiedWithoutFailures(method_idx, class_def_idx, dex_file) ||
      verifier::CanCompilerHandleVerificationFailure(
          verified_method->GetEncounteredVerificationFailures())) {
    ArenaAllocator allocator(runtime->GetArenaPool());
    ArenaStack arena_stack(runtime->GetArenaPool());
    CodeVectorAllocator code_allocator(&allocator);
    std::unique_ptr<CodeGenerator> codegen;
    bool compiled_intrinsic = false;
    {
      DexCompilationUnit dex_compilation_unit(
          jclass_loader,
          runtime->GetClassLinker(),
          dex_file,
          code_item,
          class_def_idx,
          method_idx,
          access_flags,
          /* verified_method */ nullptr,  // Not needed by the Optimizing compiler.
          dex_cache);
      ScopedObjectAccess soa(Thread::Current());
      ArtMethod* method = compiler_driver->ResolveMethod(
            soa, dex_cache, jclass_loader, &dex_compilation_unit, method_idx, invoke_type);
      VariableSizedHandleScope handles(soa.Self());
      // Go to native so that we don't block GC during compilation.
      ScopedThreadSuspension sts(soa.Self(), kNative);
      if (method != nullptr && UNLIKELY(method->IsIntrinsic())) {
        DCHECK(compiler_driver->GetCompilerOptions().IsBootImage());
        codegen.reset(
            TryCompileIntrinsic(&allocator,
                                &arena_stack,
                                &code_allocator,
                                dex_compilation_unit,
                                method,
                                &handles));
        if (codegen != nullptr) {
          compiled_intrinsic = true;
        }
      }
      if (codegen == nullptr) {
        codegen.reset(
            TryCompile(&allocator,
                       &arena_stack,
                       &code_allocator,
                       dex_compilation_unit,
                       method,
                       /* osr */ false,
                       &handles));
      }
    }
    if (codegen.get() != nullptr) {
      compiled_method = Emit(&allocator,
                             &code_allocator,
                             codegen.get(),
                             compiled_intrinsic ? nullptr : code_item);
      if (compiled_intrinsic) {
        compiled_method->MarkAsIntrinsic();
      }

      if (kArenaAllocatorCountAllocations) {
        codegen.reset();  // Release codegen's ScopedArenaAllocator for memory accounting.
        size_t total_allocated = allocator.BytesAllocated() + arena_stack.PeakBytesAllocated();
        if (total_allocated > kArenaAllocatorMemoryReportThreshold) {
          MemStats mem_stats(allocator.GetMemStats());
          MemStats peak_stats(arena_stack.GetPeakStats());
          LOG(INFO) << "Used " << total_allocated << " bytes of arena memory for compiling "
                    << dex_file.PrettyMethod(method_idx)
                    << "\n" << Dumpable<MemStats>(mem_stats)
                    << "\n" << Dumpable<MemStats>(peak_stats);
        }
      }
    }
  } else {
    MethodCompilationStat method_stat;
    if (compiler_driver->GetCompilerOptions().VerifyAtRuntime()) {
      method_stat = MethodCompilationStat::kNotCompiledVerifyAtRuntime;
    } else {
      method_stat = MethodCompilationStat::kNotCompiledVerificationError;
    }
    MaybeRecordStat(compilation_stats_.get(), method_stat);
  }

  if (kIsDebugBuild &&
      IsCompilingWithCoreImage() &&
      IsInstructionSetSupported(compiler_driver->GetInstructionSet())) {
    // For testing purposes, we put a special marker on method names
    // that should be compiled with this compiler (when the
    // instruction set is supported). This makes sure we're not
    // regressing.
    std::string method_name = dex_file.PrettyMethod(method_idx);
    bool shouldCompile = method_name.find("$opt$") != std::string::npos;
    DCHECK((compiled_method != nullptr) || !shouldCompile) << "Didn't compile " << method_name;
  }

  return compiled_method;
}

CompiledMethod* OptimizingCompiler::JniCompile(uint32_t access_flags,
                                               uint32_t method_idx,
                                               const DexFile& dex_file,
                                               Handle<mirror::DexCache> dex_cache) const {
  if (GetCompilerDriver()->GetCompilerOptions().IsBootImage()) {
    ScopedObjectAccess soa(Thread::Current());
    Runtime* runtime = Runtime::Current();
    ArtMethod* method = runtime->GetClassLinker()->LookupResolvedMethod(
        method_idx, dex_cache.Get(), /* class_loader */ nullptr);
    if (method != nullptr && UNLIKELY(method->IsIntrinsic())) {
      ScopedNullHandle<mirror::ClassLoader> class_loader;  // null means boot class path loader.
      DexCompilationUnit dex_compilation_unit(
          class_loader,
          runtime->GetClassLinker(),
          dex_file,
          /* code_item */ nullptr,
          /* class_def_idx */ DexFile::kDexNoIndex16,
          method_idx,
          access_flags,
          /* verified_method */ nullptr,
          dex_cache);
      ArenaAllocator allocator(runtime->GetArenaPool());
      ArenaStack arena_stack(runtime->GetArenaPool());
      CodeVectorAllocator code_allocator(&allocator);
      VariableSizedHandleScope handles(soa.Self());
      // Go to native so that we don't block GC during compilation.
      ScopedThreadSuspension sts(soa.Self(), kNative);
      std::unique_ptr<CodeGenerator> codegen(
          TryCompileIntrinsic(&allocator,
                              &arena_stack,
                              &code_allocator,
                              dex_compilation_unit,
                              method,
                              &handles));
      if (codegen != nullptr) {
        CompiledMethod* compiled_method = Emit(&allocator,
                                               &code_allocator,
                                               codegen.get(),
                                               /* code_item_for_osr_check */ nullptr);
        compiled_method->MarkAsIntrinsic();
        return compiled_method;
      }
    }
  }

  JniCompiledMethod jni_compiled_method = ArtQuickJniCompileMethod(
      GetCompilerDriver(), access_flags, method_idx, dex_file);
  MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kCompiledNativeStub);
  return CompiledMethod::SwapAllocCompiledMethod(
      GetCompilerDriver(),
      jni_compiled_method.GetInstructionSet(),
      jni_compiled_method.GetCode(),
      jni_compiled_method.GetFrameSize(),
      jni_compiled_method.GetCoreSpillMask(),
      jni_compiled_method.GetFpSpillMask(),
      /* method_info */ ArrayRef<const uint8_t>(),
      /* vmap_table */ ArrayRef<const uint8_t>(),
      jni_compiled_method.GetCfi(),
      /* patches */ ArrayRef<const linker::LinkerPatch>());
}

Compiler* CreateOptimizingCompiler(CompilerDriver* driver) {
  return new OptimizingCompiler(driver);
}

bool IsCompilingWithCoreImage() {
  const std::string& image = Runtime::Current()->GetImageLocation();
  return CompilerDriver::IsCoreImageFilename(image);
}

bool EncodeArtMethodInInlineInfo(ArtMethod* method ATTRIBUTE_UNUSED) {
  // Note: the runtime is null only for unit testing.
  return Runtime::Current() == nullptr || !Runtime::Current()->IsAotCompiler();
}

bool CanEncodeInlinedMethodInStackMap(const DexFile& caller_dex_file, ArtMethod* callee) {
  if (!Runtime::Current()->IsAotCompiler()) {
    // JIT can always encode methods in stack maps.
    return true;
  }
  if (IsSameDexFile(caller_dex_file, *callee->GetDexFile())) {
    return true;
  }
  // TODO(ngeoffray): Support more AOT cases for inlining:
  // - methods in multidex
  // - methods in boot image for on-device non-PIC compilation.
  return false;
}

bool OptimizingCompiler::JitCompile(Thread* self,
                                    jit::JitCodeCache* code_cache,
                                    ArtMethod* method,
                                    bool osr,
                                    jit::JitLogger* jit_logger) {
  StackHandleScope<3> hs(self);
  Handle<mirror::ClassLoader> class_loader(hs.NewHandle(
      method->GetDeclaringClass()->GetClassLoader()));
  Handle<mirror::DexCache> dex_cache(hs.NewHandle(method->GetDexCache()));
  DCHECK(method->IsCompilable());

  const DexFile* dex_file = method->GetDexFile();
  const uint16_t class_def_idx = method->GetClassDefIndex();
  const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset());
  const uint32_t method_idx = method->GetDexMethodIndex();
  const uint32_t access_flags = method->GetAccessFlags();

  Runtime* runtime = Runtime::Current();
  ArenaAllocator allocator(runtime->GetJitArenaPool());

  if (UNLIKELY(method->IsNative())) {
    JniCompiledMethod jni_compiled_method = ArtQuickJniCompileMethod(
        GetCompilerDriver(), access_flags, method_idx, *dex_file);
    ScopedNullHandle<mirror::ObjectArray<mirror::Object>> roots;
    ArenaSet<ArtMethod*, std::less<ArtMethod*>> cha_single_implementation_list(
        allocator.Adapter(kArenaAllocCHA));
    const void* code = code_cache->CommitCode(
        self,
        method,
        /* stack_map_data */ nullptr,
        /* method_info_data */ nullptr,
        /* roots_data */ nullptr,
        jni_compiled_method.GetFrameSize(),
        jni_compiled_method.GetCoreSpillMask(),
        jni_compiled_method.GetFpSpillMask(),
        jni_compiled_method.GetCode().data(),
        jni_compiled_method.GetCode().size(),
        /* data_size */ 0u,
        osr,
        roots,
        /* has_should_deoptimize_flag */ false,
        cha_single_implementation_list);
    if (code == nullptr) {
      return false;
    }

    const CompilerOptions& compiler_options = GetCompilerDriver()->GetCompilerOptions();
    if (compiler_options.GetGenerateDebugInfo()) {
      const auto* method_header = reinterpret_cast<const OatQuickMethodHeader*>(code);
      const uintptr_t code_address = reinterpret_cast<uintptr_t>(method_header->GetCode());
      debug::MethodDebugInfo info = {};
      DCHECK(info.trampoline_name.empty());
      info.dex_file = dex_file;
      info.class_def_index = class_def_idx;
      info.dex_method_index = method_idx;
      info.access_flags = access_flags;
      info.code_item = code_item;
      info.isa = jni_compiled_method.GetInstructionSet();
      info.deduped = false;
      info.is_native_debuggable = compiler_options.GetNativeDebuggable();
      info.is_optimized = true;
      info.is_code_address_text_relative = false;
      info.code_address = code_address;
      info.code_size = jni_compiled_method.GetCode().size();
      info.frame_size_in_bytes = method_header->GetFrameSizeInBytes();
      info.code_info = nullptr;
      info.cfi = jni_compiled_method.GetCfi();
      std::vector<uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
          GetCompilerDriver()->GetInstructionSet(),
          GetCompilerDriver()->GetInstructionSetFeatures(),
          ArrayRef<const debug::MethodDebugInfo>(&info, 1));
      CreateJITCodeEntryForAddress(code_address, std::move(elf_file));
    }

    Runtime::Current()->GetJit()->AddMemoryUsage(method, allocator.BytesUsed());
    if (jit_logger != nullptr) {
      jit_logger->WriteLog(code, jni_compiled_method.GetCode().size(), method);
    }
    return true;
  }

  ArenaStack arena_stack(runtime->GetJitArenaPool());
  CodeVectorAllocator code_allocator(&allocator);
  VariableSizedHandleScope handles(self);

  std::unique_ptr<CodeGenerator> codegen;
  {
    DexCompilationUnit dex_compilation_unit(
        class_loader,
        runtime->GetClassLinker(),
        *dex_file,
        code_item,
        class_def_idx,
        method_idx,
        access_flags,
        /* verified_method */ nullptr,
        dex_cache);

    // Go to native so that we don't block GC during compilation.
    ScopedThreadSuspension sts(self, kNative);
    codegen.reset(
        TryCompile(&allocator,
                   &arena_stack,
                   &code_allocator,
                   dex_compilation_unit,
                   method,
                   osr,
                   &handles));
    if (codegen.get() == nullptr) {
      return false;
    }
  }

  size_t stack_map_size = 0;
  size_t method_info_size = 0;
  codegen->ComputeStackMapAndMethodInfoSize(&stack_map_size, &method_info_size);
  size_t number_of_roots = codegen->GetNumberOfJitRoots();
  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
  // We allocate an object array to ensure the JIT roots that we will collect in EmitJitRoots
  // will be visible by the GC between EmitLiterals and CommitCode. Once CommitCode is
  // executed, this array is not needed.
  Handle<mirror::ObjectArray<mirror::Object>> roots(
      hs.NewHandle(mirror::ObjectArray<mirror::Object>::Alloc(
          self, class_linker->GetClassRoot(ClassLinker::kObjectArrayClass), number_of_roots)));
  if (roots == nullptr) {
    // Out of memory, just clear the exception to avoid any Java exception uncaught problems.
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kJitOutOfMemoryForCommit);
    DCHECK(self->IsExceptionPending());
    self->ClearException();
    return false;
  }
  uint8_t* stack_map_data = nullptr;
  uint8_t* method_info_data = nullptr;
  uint8_t* roots_data = nullptr;
  uint32_t data_size = code_cache->ReserveData(self,
                                               stack_map_size,
                                               method_info_size,
                                               number_of_roots,
                                               method,
                                               &stack_map_data,
                                               &method_info_data,
                                               &roots_data);
  if (stack_map_data == nullptr || roots_data == nullptr) {
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kJitOutOfMemoryForCommit);
    return false;
  }
  codegen->BuildStackMaps(MemoryRegion(stack_map_data, stack_map_size),
                          MemoryRegion(method_info_data, method_info_size),
                          code_item);
  codegen->EmitJitRoots(code_allocator.GetData(), roots, roots_data);

  const void* code = code_cache->CommitCode(
      self,
      method,
      stack_map_data,
      method_info_data,
      roots_data,
      codegen->HasEmptyFrame() ? 0 : codegen->GetFrameSize(),
      codegen->GetCoreSpillMask(),
      codegen->GetFpuSpillMask(),
      code_allocator.GetMemory().data(),
      code_allocator.GetSize(),
      data_size,
      osr,
      roots,
      codegen->GetGraph()->HasShouldDeoptimizeFlag(),
      codegen->GetGraph()->GetCHASingleImplementationList());

  if (code == nullptr) {
    MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kJitOutOfMemoryForCommit);
    code_cache->ClearData(self, stack_map_data, roots_data);
    return false;
  }

  const CompilerOptions& compiler_options = GetCompilerDriver()->GetCompilerOptions();
  if (compiler_options.GetGenerateDebugInfo()) {
    const auto* method_header = reinterpret_cast<const OatQuickMethodHeader*>(code);
    const uintptr_t code_address = reinterpret_cast<uintptr_t>(method_header->GetCode());
    debug::MethodDebugInfo info = {};
    DCHECK(info.trampoline_name.empty());
    info.dex_file = dex_file;
    info.class_def_index = class_def_idx;
    info.dex_method_index = method_idx;
    info.access_flags = access_flags;
    info.code_item = code_item;
    info.isa = codegen->GetInstructionSet();
    info.deduped = false;
    info.is_native_debuggable = compiler_options.GetNativeDebuggable();
    info.is_optimized = true;
    info.is_code_address_text_relative = false;
    info.code_address = code_address;
    info.code_size = code_allocator.GetSize();
    info.frame_size_in_bytes = method_header->GetFrameSizeInBytes();
    info.code_info = stack_map_size == 0 ? nullptr : stack_map_data;
    info.cfi = ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data());
    std::vector<uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
        GetCompilerDriver()->GetInstructionSet(),
        GetCompilerDriver()->GetInstructionSetFeatures(),
        ArrayRef<const debug::MethodDebugInfo>(&info, 1));
    CreateJITCodeEntryForAddress(code_address, std::move(elf_file));
  }

  Runtime::Current()->GetJit()->AddMemoryUsage(method, allocator.BytesUsed());
  if (jit_logger != nullptr) {
    jit_logger->WriteLog(code, code_allocator.GetSize(), method);
  }

  if (kArenaAllocatorCountAllocations) {
    codegen.reset();  // Release codegen's ScopedArenaAllocator for memory accounting.
    size_t total_allocated = allocator.BytesAllocated() + arena_stack.PeakBytesAllocated();
    if (total_allocated > kArenaAllocatorMemoryReportThreshold) {
      MemStats mem_stats(allocator.GetMemStats());
      MemStats peak_stats(arena_stack.GetPeakStats());
      LOG(INFO) << "Used " << total_allocated << " bytes of arena memory for compiling "
                << dex_file->PrettyMethod(method_idx)
                << "\n" << Dumpable<MemStats>(mem_stats)
                << "\n" << Dumpable<MemStats>(peak_stats);
    }
  }

  return true;
}

}  // namespace art