text: // Copyright 2012 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/v8.h"
  
  #include "src/assembler.h"
  #include "src/base/once.h"
  #include "src/base/platform/platform.h"
  #include "src/bootstrapper.h"
  #include "src/compiler/pipeline.h"
  #include "src/debug.h"
  #include "src/deoptimizer.h"
  #include "src/elements.h"
  #include "src/frames.h"
  #include "src/heap/store-buffer.h"
  #include "src/heap-profiler.h"
  #include "src/hydrogen.h"
  #include "src/isolate.h"
  #include "src/lithium-allocator.h"
  #include "src/objects.h"
  #include "src/runtime-profiler.h"
  #include "src/sampler.h"
  #include "src/serialize.h"
  
  
  namespace v8 {
  namespace internal {
  
  V8_DECLARE_ONCE(init_once);
  
  v8::ArrayBuffer::Allocator* V8::array_buffer_allocator_ = NULL;
  v8::Platform* V8::platform_ = NULL;
  
  
  bool V8::Initialize(Deserializer* des) {
    InitializeOncePerProcess();
    Isolate* isolate = Isolate::UncheckedCurrent();
    if (isolate == NULL) return true;
    if (isolate->IsDead()) return false;
    if (isolate->IsInitialized()) return true;
  
    return isolate->Init(des);
  }
  
  
  void V8::TearDown() {
    Bootstrapper::TearDownExtensions();
    ElementsAccessor::TearDown();
    LOperand::TearDownCaches();
    compiler::Pipeline::TearDown();
    ExternalReference::TearDownMathExpData();
    RegisteredExtension::UnregisterAll();
    Isolate::GlobalTearDown();
    Sampler::TearDown();
    FlagList::ResetAllFlags();  // Frees memory held by string arguments.
  }
  
  
  void V8::SetReturnAddressLocationResolver(
        ReturnAddressLocationResolver resolver) {
    StackFrame::SetReturnAddressLocationResolver(resolver);
  }
  
  
  void V8::InitializeOncePerProcessImpl() {
    FlagList::EnforceFlagImplications();
  
    if (FLAG_predictable && FLAG_random_seed == 0) {
      // Avoid random seeds in predictable mode.
      FLAG_random_seed = 12347;
    }
  
    if (FLAG_stress_compaction) {
      FLAG_force_marking_deque_overflows = true;
      FLAG_gc_global = true;
      FLAG_max_semi_space_size = 1;
    }
  
    base::OS::Initialize(FLAG_random_seed, FLAG_hard_abort, FLAG_gc_fake_mmap);
  
    Sampler::SetUp();
    CpuFeatures::Probe(false);
    init_memcopy_functions();
    // The custom exp implementation needs 16KB of lookup data; initialize it
    // on demand.
    init_fast_sqrt_function();
  #ifdef _WIN64
    init_modulo_function();
  #endif
    ElementsAccessor::InitializeOncePerProcess();
    LOperand::SetUpCaches();
    compiler::Pipeline::SetUp();
    SetUpJSCallerSavedCodeData();
    ExternalReference::SetUp();
    Bootstrapper::InitializeOncePerProcess();
  }
  
  
  void V8::InitializeOncePerProcess() {
    base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
  }
  
  
  void V8::InitializePlatform(v8::Platform* platform) {
    CHECK(!platform_);
    CHECK(platform);
    platform_ = platform;
  }
  
  
  void V8::ShutdownPlatform() {
    CHECK(platform_);
    platform_ = NULL;
  }
  
  
  v8::Platform* V8::GetCurrentPlatform() {
    DCHECK(platform_);
    return platform_;
  }
  
  } }  // namespace v8::internal
  