File: lithium-codegen.cc

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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/lithium-codegen.h"

#include <sstream>

#include "src/v8.h"

#if V8_TARGET_ARCH_IA32
#include "src/ia32/lithium-ia32.h"  // NOLINT
#include "src/ia32/lithium-codegen-ia32.h"  // NOLINT
#elif V8_TARGET_ARCH_X64
#include "src/x64/lithium-x64.h"  // NOLINT
#include "src/x64/lithium-codegen-x64.h"  // NOLINT
#elif V8_TARGET_ARCH_ARM
#include "src/arm/lithium-arm.h"  // NOLINT
#include "src/arm/lithium-codegen-arm.h"  // NOLINT
#elif V8_TARGET_ARCH_ARM64
#include "src/arm64/lithium-arm64.h"  // NOLINT
#include "src/arm64/lithium-codegen-arm64.h"  // NOLINT
#elif V8_TARGET_ARCH_MIPS
#include "src/mips/lithium-mips.h"  // NOLINT
#include "src/mips/lithium-codegen-mips.h"  // NOLINT
#elif V8_TARGET_ARCH_MIPS64
#include "src/mips64/lithium-mips64.h"  // NOLINT
#include "src/mips64/lithium-codegen-mips64.h"  // NOLINT
#elif V8_TARGET_ARCH_X87
#include "src/x87/lithium-x87.h"  // NOLINT
#include "src/x87/lithium-codegen-x87.h"  // NOLINT
#elif V8_TARGET_ARCH_PPC
#include "src/ppc/lithium-ppc.h"          // NOLINT
#include "src/ppc/lithium-codegen-ppc.h"  // NOLINT
#elif V8_TARGET_ARCH_S390
#include "src/s390/lithium-s390.h" // NOLINT
#include "src/s390/lithium-codegen-s390.h" // NOLINT
#else
#error Unsupported target architecture.
#endif

namespace v8 {
namespace internal {


HGraph* LCodeGenBase::graph() const {
  return chunk()->graph();
}


LCodeGenBase::LCodeGenBase(LChunk* chunk, MacroAssembler* assembler,
                           CompilationInfo* info)
    : chunk_(static_cast<LPlatformChunk*>(chunk)),
      masm_(assembler),
      info_(info),
      zone_(info->zone()),
      status_(UNUSED),
      current_block_(-1),
      current_instruction_(-1),
      instructions_(chunk->instructions()),
      deoptimization_literals_(8, info->zone()),
      last_lazy_deopt_pc_(0) {}


bool LCodeGenBase::GenerateBody() {
  DCHECK(is_generating());
  bool emit_instructions = true;
  LCodeGen* codegen = static_cast<LCodeGen*>(this);
  for (current_instruction_ = 0;
       !is_aborted() && current_instruction_ < instructions_->length();
       current_instruction_++) {
    LInstruction* instr = instructions_->at(current_instruction_);

    // Don't emit code for basic blocks with a replacement.
    if (instr->IsLabel()) {
      emit_instructions = !LLabel::cast(instr)->HasReplacement() &&
          (!FLAG_unreachable_code_elimination ||
           instr->hydrogen_value()->block()->IsReachable());
      if (FLAG_code_comments && !emit_instructions) {
        Comment(
            ";;; <@%d,#%d> -------------------- B%d (unreachable/replaced) "
            "--------------------",
            current_instruction_,
            instr->hydrogen_value()->id(),
            instr->hydrogen_value()->block()->block_id());
      }
    }
    if (!emit_instructions) continue;

    if (FLAG_code_comments && instr->HasInterestingComment(codegen)) {
      Comment(";;; <@%d,#%d> %s",
              current_instruction_,
              instr->hydrogen_value()->id(),
              instr->Mnemonic());
    }

    GenerateBodyInstructionPre(instr);

    HValue* value = instr->hydrogen_value();
    if (!value->position().IsUnknown()) {
      RecordAndWritePosition(
        chunk()->graph()->SourcePositionToScriptPosition(value->position()));
    }

    instr->CompileToNative(codegen);

    GenerateBodyInstructionPost(instr);
  }
  EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
  last_lazy_deopt_pc_ = masm()->pc_offset();
  return !is_aborted();
}


void LCodeGenBase::CheckEnvironmentUsage() {
#ifdef DEBUG
  bool dead_block = false;
  for (int i = 0; i < instructions_->length(); i++) {
    LInstruction* instr = instructions_->at(i);
    HValue* hval = instr->hydrogen_value();
    if (instr->IsLabel()) dead_block = LLabel::cast(instr)->HasReplacement();
    if (dead_block || !hval->block()->IsReachable()) continue;

    HInstruction* hinstr = HInstruction::cast(hval);
    if (!hinstr->CanDeoptimize() && instr->HasEnvironment()) {
      V8_Fatal(__FILE__, __LINE__, "CanDeoptimize is wrong for %s (%s)",
               hinstr->Mnemonic(), instr->Mnemonic());
    }

    if (instr->HasEnvironment() && !instr->environment()->has_been_used()) {
      V8_Fatal(__FILE__, __LINE__, "unused environment for %s (%s)",
               hinstr->Mnemonic(), instr->Mnemonic());
    }
  }
#endif
}


void LCodeGenBase::Comment(const char* format, ...) {
  if (!FLAG_code_comments) return;
  char buffer[4 * KB];
  StringBuilder builder(buffer, arraysize(buffer));
  va_list arguments;
  va_start(arguments, format);
  builder.AddFormattedList(format, arguments);
  va_end(arguments);

  // Copy the string before recording it in the assembler to avoid
  // issues when the stack allocated buffer goes out of scope.
  size_t length = builder.position();
  Vector<char> copy = Vector<char>::New(static_cast<int>(length) + 1);
  MemCopy(copy.start(), builder.Finalize(), copy.length());
  masm()->RecordComment(copy.start());
}


void LCodeGenBase::DeoptComment(const Deoptimizer::DeoptInfo& deopt_info) {
  masm()->RecordDeoptReason(deopt_info.deopt_reason, deopt_info.position);
}


int LCodeGenBase::GetNextEmittedBlock() const {
  for (int i = current_block_ + 1; i < graph()->blocks()->length(); ++i) {
    if (!graph()->blocks()->at(i)->IsReachable()) continue;
    if (!chunk_->GetLabel(i)->HasReplacement()) return i;
  }
  return -1;
}


void LCodeGenBase::Abort(BailoutReason reason) {
  info()->AbortOptimization(reason);
  status_ = ABORTED;
}


void LCodeGenBase::Retry(BailoutReason reason) {
  info()->RetryOptimization(reason);
  status_ = ABORTED;
}


void LCodeGenBase::AddDeprecationDependency(Handle<Map> map) {
  if (map->is_deprecated()) return Retry(kMapBecameDeprecated);
  chunk_->AddDeprecationDependency(map);
}


void LCodeGenBase::AddStabilityDependency(Handle<Map> map) {
  if (!map->is_stable()) return Retry(kMapBecameUnstable);
  chunk_->AddStabilityDependency(map);
}


int LCodeGenBase::DefineDeoptimizationLiteral(Handle<Object> literal) {
  int result = deoptimization_literals_.length();
  for (int i = 0; i < deoptimization_literals_.length(); ++i) {
    if (deoptimization_literals_[i].is_identical_to(literal)) return i;
  }
  deoptimization_literals_.Add(literal, zone());
  return result;
}


void LCodeGenBase::WriteTranslationFrame(LEnvironment* environment,
                                         Translation* translation) {
  int translation_size = environment->translation_size();
  // The output frame height does not include the parameters.
  int height = translation_size - environment->parameter_count();

  switch (environment->frame_type()) {
    case JS_FUNCTION: {
      int shared_id = DefineDeoptimizationLiteral(
          environment->entry() ? environment->entry()->shared()
                               : info()->shared_info());
      translation->BeginJSFrame(environment->ast_id(), shared_id, height);
      if (info()->closure().is_identical_to(environment->closure())) {
        translation->StoreJSFrameFunction();
      } else {
        int closure_id = DefineDeoptimizationLiteral(environment->closure());
        translation->StoreLiteral(closure_id);
      }
      break;
    }
    case JS_CONSTRUCT: {
      int shared_id = DefineDeoptimizationLiteral(
          environment->entry() ? environment->entry()->shared()
                               : info()->shared_info());
      translation->BeginConstructStubFrame(shared_id, translation_size);
      if (info()->closure().is_identical_to(environment->closure())) {
        translation->StoreJSFrameFunction();
      } else {
        int closure_id = DefineDeoptimizationLiteral(environment->closure());
        translation->StoreLiteral(closure_id);
      }
      break;
    }
    case JS_GETTER: {
      DCHECK(translation_size == 1);
      DCHECK(height == 0);
      int shared_id = DefineDeoptimizationLiteral(
          environment->entry() ? environment->entry()->shared()
                               : info()->shared_info());
      translation->BeginGetterStubFrame(shared_id);
      if (info()->closure().is_identical_to(environment->closure())) {
        translation->StoreJSFrameFunction();
      } else {
        int closure_id = DefineDeoptimizationLiteral(environment->closure());
        translation->StoreLiteral(closure_id);
      }
      break;
    }
    case JS_SETTER: {
      DCHECK(translation_size == 2);
      DCHECK(height == 0);
      int shared_id = DefineDeoptimizationLiteral(
          environment->entry() ? environment->entry()->shared()
                               : info()->shared_info());
      translation->BeginSetterStubFrame(shared_id);
      if (info()->closure().is_identical_to(environment->closure())) {
        translation->StoreJSFrameFunction();
      } else {
        int closure_id = DefineDeoptimizationLiteral(environment->closure());
        translation->StoreLiteral(closure_id);
      }
      break;
    }
    case ARGUMENTS_ADAPTOR: {
      int shared_id = DefineDeoptimizationLiteral(
          environment->entry() ? environment->entry()->shared()
                               : info()->shared_info());
      translation->BeginArgumentsAdaptorFrame(shared_id, translation_size);
      if (info()->closure().is_identical_to(environment->closure())) {
        translation->StoreJSFrameFunction();
      } else {
        int closure_id = DefineDeoptimizationLiteral(environment->closure());
        translation->StoreLiteral(closure_id);
      }
      break;
    }
    case STUB:
      translation->BeginCompiledStubFrame(translation_size);
      break;
  }
}


Deoptimizer::DeoptInfo LCodeGenBase::MakeDeoptInfo(
    LInstruction* instr, Deoptimizer::DeoptReason deopt_reason) {
  Deoptimizer::DeoptInfo deopt_info(instr->hydrogen_value()->position(),
                                    instr->Mnemonic(), deopt_reason);
  HEnterInlined* enter_inlined = instr->environment()->entry();
  deopt_info.inlining_id = enter_inlined ? enter_inlined->inlining_id() : 0;
  return deopt_info;
}
}  // namespace internal
}  // namespace v8