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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "src/v8.h"
      6 
      7 #include "src/assembler.h"
      8 #include "src/base/once.h"
      9 #include "src/base/platform/platform.h"
     10 #include "src/bootstrapper.h"
     11 #include "src/compiler/pipeline.h"
     12 #include "src/debug.h"
     13 #include "src/deoptimizer.h"
     14 #include "src/elements.h"
     15 #include "src/frames.h"
     16 #include "src/heap/store-buffer.h"
     17 #include "src/heap-profiler.h"
     18 #include "src/hydrogen.h"
     19 #include "src/isolate.h"
     20 #include "src/lithium-allocator.h"
     21 #include "src/objects.h"
     22 #include "src/runtime-profiler.h"
     23 #include "src/sampler.h"
     24 #include "src/serialize.h"
     25 
     26 
     27 namespace v8 {
     28 namespace internal {
     29 
     30 V8_DECLARE_ONCE(init_once);
     31 
     32 v8::ArrayBuffer::Allocator* V8::array_buffer_allocator_ = NULL;
     33 v8::Platform* V8::platform_ = NULL;
     34 
     35 
     36 bool V8::Initialize() {
     37   InitializeOncePerProcess();
     38   return true;
     39 }
     40 
     41 
     42 void V8::TearDown() {
     43   Bootstrapper::TearDownExtensions();
     44   ElementsAccessor::TearDown();
     45   LOperand::TearDownCaches();
     46   compiler::Pipeline::TearDown();
     47   ExternalReference::TearDownMathExpData();
     48   RegisteredExtension::UnregisterAll();
     49   Isolate::GlobalTearDown();
     50   Sampler::TearDown();
     51   FlagList::ResetAllFlags();  // Frees memory held by string arguments.
     52 }
     53 
     54 
     55 void V8::SetReturnAddressLocationResolver(
     56       ReturnAddressLocationResolver resolver) {
     57   StackFrame::SetReturnAddressLocationResolver(resolver);
     58 }
     59 
     60 
     61 void V8::InitializeOncePerProcessImpl() {
     62   FlagList::EnforceFlagImplications();
     63 
     64   if (FLAG_predictable && FLAG_random_seed == 0) {
     65     // Avoid random seeds in predictable mode.
     66     FLAG_random_seed = 12347;
     67   }
     68 
     69   if (FLAG_stress_compaction) {
     70     FLAG_force_marking_deque_overflows = true;
     71     FLAG_gc_global = true;
     72     FLAG_max_semi_space_size = 1;
     73   }
     74 
     75   base::OS::Initialize(FLAG_random_seed, FLAG_hard_abort, FLAG_gc_fake_mmap);
     76 
     77   Isolate::InitializeOncePerProcess();
     78 
     79   Sampler::SetUp();
     80   CpuFeatures::Probe(false);
     81   init_memcopy_functions();
     82   // The custom exp implementation needs 16KB of lookup data; initialize it
     83   // on demand.
     84   init_fast_sqrt_function();
     85 #ifdef _WIN64
     86   init_modulo_function();
     87 #endif
     88   ElementsAccessor::InitializeOncePerProcess();
     89   LOperand::SetUpCaches();
     90   compiler::Pipeline::SetUp();
     91   SetUpJSCallerSavedCodeData();
     92   ExternalReference::SetUp();
     93   Bootstrapper::InitializeOncePerProcess();
     94 }
     95 
     96 
     97 void V8::InitializeOncePerProcess() {
     98   base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
     99 }
    100 
    101 
    102 void V8::InitializePlatform(v8::Platform* platform) {
    103   CHECK(!platform_);
    104   CHECK(platform);
    105   platform_ = platform;
    106 }
    107 
    108 
    109 void V8::ShutdownPlatform() {
    110   CHECK(platform_);
    111   platform_ = NULL;
    112 }
    113 
    114 
    115 v8::Platform* V8::GetCurrentPlatform() {
    116   DCHECK(platform_);
    117   return platform_;
    118 }
    119 
    120 } }  // namespace v8::internal
    121