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/api.h"
8 #include "src/base/atomicops.h"
9 #include "src/base/once.h"
10 #include "src/base/platform/platform.h"
11 #include "src/bootstrapper.h"
12 #include "src/debug/debug.h"
13 #include "src/deoptimizer.h"
14 #include "src/elements.h"
15 #include "src/frames.h"
16 #include "src/interface-descriptors.h"
17 #include "src/isolate.h"
18 #include "src/libsampler/sampler.h"
19 #include "src/objects-inl.h"
20 #include "src/profiler/heap-profiler.h"
21 #include "src/reloc-info.h"
22 #include "src/runtime-profiler.h"
23 #include "src/simulator.h"
24 #include "src/snapshot/natives.h"
25 #include "src/snapshot/snapshot.h"
26 #include "src/tracing/tracing-category-observer.h"
27 #include "src/wasm/wasm-engine.h"
28 
29 namespace v8 {
30 namespace internal {
31 
32 V8_DECLARE_ONCE(init_once);
33 
34 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
35 V8_DECLARE_ONCE(init_natives_once);
36 V8_DECLARE_ONCE(init_snapshot_once);
37 #endif
38 
39 v8::Platform* V8::platform_ = nullptr;
40 
Initialize()41 bool V8::Initialize() {
42   InitializeOncePerProcess();
43   return true;
44 }
45 
46 
TearDown()47 void V8::TearDown() {
48 #if defined(USE_SIMULATOR)
49   Simulator::GlobalTearDown();
50 #endif
51   wasm::WasmEngine::GlobalTearDown();
52   CallDescriptors::TearDown();
53   Bootstrapper::TearDownExtensions();
54   ElementsAccessor::TearDown();
55   RegisteredExtension::UnregisterAll();
56   sampler::Sampler::TearDown();
57   FlagList::ResetAllFlags();  // Frees memory held by string arguments.
58 }
59 
60 
InitializeOncePerProcessImpl()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_hard_abort, FLAG_gc_fake_mmap);
76 
77   if (FLAG_random_seed) SetRandomMmapSeed(FLAG_random_seed);
78 
79   Isolate::InitializeOncePerProcess();
80 
81 #if defined(USE_SIMULATOR)
82   Simulator::InitializeOncePerProcess();
83 #endif
84   sampler::Sampler::SetUp();
85   CpuFeatures::Probe(false);
86   ElementsAccessor::InitializeOncePerProcess();
87   Bootstrapper::InitializeOncePerProcess();
88   CallDescriptors::InitializeOncePerProcess();
89   wasm::WasmEngine::InitializeOncePerProcess();
90 }
91 
92 
InitializeOncePerProcess()93 void V8::InitializeOncePerProcess() {
94   base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
95 }
96 
97 
InitializePlatform(v8::Platform * platform)98 void V8::InitializePlatform(v8::Platform* platform) {
99   CHECK(!platform_);
100   CHECK(platform);
101   platform_ = platform;
102   v8::base::SetPrintStackTrace(platform_->GetStackTracePrinter());
103   v8::tracing::TracingCategoryObserver::SetUp();
104 }
105 
106 
ShutdownPlatform()107 void V8::ShutdownPlatform() {
108   CHECK(platform_);
109   v8::tracing::TracingCategoryObserver::TearDown();
110   v8::base::SetPrintStackTrace(nullptr);
111   platform_ = nullptr;
112 }
113 
114 
GetCurrentPlatform()115 v8::Platform* V8::GetCurrentPlatform() {
116   v8::Platform* platform = reinterpret_cast<v8::Platform*>(
117       base::Relaxed_Load(reinterpret_cast<base::AtomicWord*>(&platform_)));
118   DCHECK(platform);
119   return platform;
120 }
121 
SetPlatformForTesting(v8::Platform * platform)122 void V8::SetPlatformForTesting(v8::Platform* platform) {
123   base::Relaxed_Store(reinterpret_cast<base::AtomicWord*>(&platform_),
124                       reinterpret_cast<base::AtomicWord>(platform));
125 }
126 
SetNativesBlob(StartupData * natives_blob)127 void V8::SetNativesBlob(StartupData* natives_blob) {
128 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
129   base::CallOnce(&init_natives_once, &SetNativesFromFile, natives_blob);
130 #else
131   UNREACHABLE();
132 #endif
133 }
134 
135 
SetSnapshotBlob(StartupData * snapshot_blob)136 void V8::SetSnapshotBlob(StartupData* snapshot_blob) {
137 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
138   base::CallOnce(&init_snapshot_once, &SetSnapshotFromFile, snapshot_blob);
139 #else
140   UNREACHABLE();
141 #endif
142 }
143 }  // namespace internal
144 
145 // static
SystemClockTimeMillis()146 double Platform::SystemClockTimeMillis() {
147   return base::OS::TimeCurrentMillis();
148 }
149 }  // namespace v8
150