1 // Copyright 2013 The Chromium 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 "gin/public/isolate_holder.h" 6 7 #include <stdlib.h> 8 #include <string.h> 9 10 #include "base/logging.h" 11 #include "base/rand_util.h" 12 #include "base/sys_info.h" 13 #include "gin/array_buffer.h" 14 #include "gin/function_template.h" 15 #include "gin/per_isolate_data.h" 16 17 namespace gin { 18 19 namespace { 20 21 bool GenerateEntropy(unsigned char* buffer, size_t amount) { 22 base::RandBytes(buffer, amount); 23 return true; 24 } 25 26 27 void EnsureV8Initialized(bool gin_managed) { 28 static bool v8_is_initialized = false; 29 static bool v8_is_gin_managed = false; 30 if (v8_is_initialized) { 31 CHECK_EQ(v8_is_gin_managed, gin_managed); 32 return; 33 } 34 v8_is_initialized = true; 35 v8_is_gin_managed = gin_managed; 36 if (!gin_managed) 37 return; 38 39 v8::V8::SetArrayBufferAllocator(ArrayBufferAllocator::SharedInstance()); 40 static const char v8_flags[] = "--use_strict --harmony"; 41 v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1); 42 v8::V8::SetEntropySource(&GenerateEntropy); 43 v8::V8::Initialize(); 44 } 45 46 } // namespace 47 48 IsolateHolder::IsolateHolder() 49 : isolate_owner_(true) { 50 EnsureV8Initialized(true); 51 isolate_ = v8::Isolate::New(); 52 v8::ResourceConstraints constraints; 53 constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(), 54 base::SysInfo::NumberOfProcessors()); 55 v8::SetResourceConstraints(isolate_, &constraints); 56 Init(); 57 } 58 59 IsolateHolder::IsolateHolder(v8::Isolate* isolate) 60 : isolate_owner_(false), 61 isolate_(isolate) { 62 EnsureV8Initialized(false); 63 Init(); 64 } 65 66 IsolateHolder::~IsolateHolder() { 67 isolate_data_.reset(); 68 if (isolate_owner_) 69 isolate_->Dispose(); 70 } 71 72 void IsolateHolder::Init() { 73 v8::Isolate::Scope isolate_scope(isolate_); 74 v8::HandleScope handle_scope(isolate_); 75 isolate_data_.reset(new PerIsolateData(isolate_)); 76 InitFunctionTemplates(isolate_data_.get()); 77 } 78 79 } // namespace gin 80
