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// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_API_H_
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#define V8_API_H_
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#include "apiutils.h"
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#include "factory.h"
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#include "../include/v8-testing.h"
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namespace v8 {
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// Constants used in the implementation of the API. The most natural thing
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// would usually be to place these with the classes that use them, but
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// we want to keep them out of v8.h because it is an externally
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// visible file.
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class Consts {
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public:
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enum TemplateType {
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FUNCTION_TEMPLATE = 0,
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OBJECT_TEMPLATE = 1
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};
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};
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// Utilities for working with neander-objects, primitive
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// env-independent JSObjects used by the api.
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class NeanderObject {
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public:
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explicit NeanderObject(int size);
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explicit inline NeanderObject(v8::internal::Handle<v8::internal::Object> obj);
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explicit inline NeanderObject(v8::internal::Object* obj);
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inline v8::internal::Object* get(int index);
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inline void set(int index, v8::internal::Object* value);
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inline v8::internal::Handle<v8::internal::JSObject> value() { return value_; }
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int size();
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private:
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v8::internal::Handle<v8::internal::JSObject> value_;
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};
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// Utilities for working with neander-arrays, a simple extensible
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// array abstraction built on neander-objects.
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class NeanderArray {
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public:
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NeanderArray();
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explicit inline NeanderArray(v8::internal::Handle<v8::internal::Object> obj);
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inline v8::internal::Handle<v8::internal::JSObject> value() {
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return obj_.value();
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}
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void add(v8::internal::Handle<v8::internal::Object> value);
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int length();
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v8::internal::Object* get(int index);
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// Change the value at an index to undefined value. If the index is
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// out of bounds, the request is ignored. Returns the old value.
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void set(int index, v8::internal::Object* value);
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private:
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NeanderObject obj_;
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};
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NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj)
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: value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { }
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NeanderObject::NeanderObject(v8::internal::Object* obj)
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: value_(v8::internal::Handle<v8::internal::JSObject>(
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v8::internal::JSObject::cast(obj))) { }
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NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj)
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: obj_(obj) { }
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v8::internal::Object* NeanderObject::get(int offset) {
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ASSERT(value()->HasFastElements());
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return v8::internal::FixedArray::cast(value()->elements())->get(offset);
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}
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void NeanderObject::set(int offset, v8::internal::Object* value) {
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ASSERT(value_->HasFastElements());
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v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
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}
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template <typename T> static inline T ToCData(v8::internal::Object* obj) {
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STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
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return reinterpret_cast<T>(
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reinterpret_cast<intptr_t>(v8::internal::Foreign::cast(obj)->address()));
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}
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template <typename T>
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static inline v8::internal::Handle<v8::internal::Object> FromCData(T obj) {
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STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
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return FACTORY->NewForeign(
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reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
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}
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class ApiFunction {
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public:
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explicit ApiFunction(v8::internal::Address addr) : addr_(addr) { }
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v8::internal::Address address() { return addr_; }
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private:
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v8::internal::Address addr_;
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};
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enum ExtensionTraversalState {
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UNVISITED, VISITED, INSTALLED
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};
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class RegisteredExtension {
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public:
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explicit RegisteredExtension(Extension* extension);
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static void Register(RegisteredExtension* that);
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Extension* extension() { return extension_; }
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RegisteredExtension* next() { return next_; }
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RegisteredExtension* next_auto() { return next_auto_; }
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ExtensionTraversalState state() { return state_; }
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void set_state(ExtensionTraversalState value) { state_ = value; }
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static RegisteredExtension* first_extension() { return first_extension_; }
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private:
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Extension* extension_;
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RegisteredExtension* next_;
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RegisteredExtension* next_auto_;
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ExtensionTraversalState state_;
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static RegisteredExtension* first_extension_;
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};
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class Utils {
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public:
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static bool ReportApiFailure(const char* location, const char* message);
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static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj);
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static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj);
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static inline Local<Context> ToLocal(
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v8::internal::Handle<v8::internal::Context> obj);
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static inline Local<Value> ToLocal(
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v8::internal::Handle<v8::internal::Object> obj);
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static inline Local<Function> ToLocal(
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v8::internal::Handle<v8::internal::JSFunction> obj);
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static inline Local<String> ToLocal(
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v8::internal::Handle<v8::internal::String> obj);
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static inline Local<RegExp> ToLocal(
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v8::internal::Handle<v8::internal::JSRegExp> obj);
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static inline Local<Object> ToLocal(
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v8::internal::Handle<v8::internal::JSObject> obj);
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static inline Local<Array> ToLocal(
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v8::internal::Handle<v8::internal::JSArray> obj);
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static inline Local<External> ToLocal(
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v8::internal::Handle<v8::internal::Foreign> obj);
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static inline Local<Message> MessageToLocal(
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v8::internal::Handle<v8::internal::Object> obj);
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static inline Local<StackTrace> StackTraceToLocal(
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v8::internal::Handle<v8::internal::JSArray> obj);
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static inline Local<StackFrame> StackFrameToLocal(
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v8::internal::Handle<v8::internal::JSObject> obj);
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static inline Local<Number> NumberToLocal(
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v8::internal::Handle<v8::internal::Object> obj);
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static inline Local<Integer> IntegerToLocal(
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v8::internal::Handle<v8::internal::Object> obj);
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static inline Local<Uint32> Uint32ToLocal(
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v8::internal::Handle<v8::internal::Object> obj);
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static inline Local<FunctionTemplate> ToLocal(
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v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
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static inline Local<ObjectTemplate> ToLocal(
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v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
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static inline Local<Signature> ToLocal(
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v8::internal::Handle<v8::internal::SignatureInfo> obj);
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static inline Local<TypeSwitch> ToLocal(
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v8::internal::Handle<v8::internal::TypeSwitchInfo> obj);
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static inline v8::internal::Handle<v8::internal::TemplateInfo>
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OpenHandle(const Template* that);
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static inline v8::internal::Handle<v8::internal::FunctionTemplateInfo>
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OpenHandle(const FunctionTemplate* that);
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static inline v8::internal::Handle<v8::internal::ObjectTemplateInfo>
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OpenHandle(const ObjectTemplate* that);
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static inline v8::internal::Handle<v8::internal::Object>
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OpenHandle(const Data* data);
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static inline v8::internal::Handle<v8::internal::JSRegExp>
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OpenHandle(const RegExp* data);
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static inline v8::internal::Handle<v8::internal::JSObject>
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OpenHandle(const v8::Object* data);
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static inline v8::internal::Handle<v8::internal::JSArray>
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OpenHandle(const v8::Array* data);
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static inline v8::internal::Handle<v8::internal::String>
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OpenHandle(const String* data);
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static inline v8::internal::Handle<v8::internal::Object>
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OpenHandle(const Script* data);
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static inline v8::internal::Handle<v8::internal::JSFunction>
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OpenHandle(const Function* data);
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static inline v8::internal::Handle<v8::internal::JSObject>
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OpenHandle(const Message* message);
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static inline v8::internal::Handle<v8::internal::JSArray>
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OpenHandle(const StackTrace* stack_trace);
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static inline v8::internal::Handle<v8::internal::JSObject>
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OpenHandle(const StackFrame* stack_frame);
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static inline v8::internal::Handle<v8::internal::Context>
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OpenHandle(const v8::Context* context);
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static inline v8::internal::Handle<v8::internal::SignatureInfo>
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OpenHandle(const v8::Signature* sig);
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static inline v8::internal::Handle<v8::internal::TypeSwitchInfo>
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OpenHandle(const v8::TypeSwitch* that);
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static inline v8::internal::Handle<v8::internal::Foreign>
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OpenHandle(const v8::External* that);
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};
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template <class T>
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static inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
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return reinterpret_cast<T*>(obj.location());
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}
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template <class T>
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v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom(
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v8::HandleScope* scope) {
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v8::internal::Handle<T> handle;
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if (!is_null()) {
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handle = *this;
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}
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return Utils::OpenHandle(*scope->Close(Utils::ToLocal(handle)));
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}
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// Implementations of ToLocal
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#define MAKE_TO_LOCAL(Name, From, To) \
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Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
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ASSERT(obj.is_null() || !obj->IsTheHole()); \
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return Local<To>(reinterpret_cast<To*>(obj.location())); \
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}
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MAKE_TO_LOCAL(ToLocal, Context, Context)
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MAKE_TO_LOCAL(ToLocal, Object, Value)
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MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
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MAKE_TO_LOCAL(ToLocal, String, String)
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MAKE_TO_LOCAL(ToLocal, JSRegExp, RegExp)
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MAKE_TO_LOCAL(ToLocal, JSObject, Object)
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MAKE_TO_LOCAL(ToLocal, JSArray, Array)
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MAKE_TO_LOCAL(ToLocal, Foreign, External)
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MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
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MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
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MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature)
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MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch)
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MAKE_TO_LOCAL(MessageToLocal, Object, Message)
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MAKE_TO_LOCAL(StackTraceToLocal, JSArray, StackTrace)
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MAKE_TO_LOCAL(StackFrameToLocal, JSObject, StackFrame)
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MAKE_TO_LOCAL(NumberToLocal, Object, Number)
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MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
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MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
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#undef MAKE_TO_LOCAL
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// Implementations of OpenHandle
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#define MAKE_OPEN_HANDLE(From, To) \
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v8::internal::Handle<v8::internal::To> Utils::OpenHandle(\
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const v8::From* that) { \
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return v8::internal::Handle<v8::internal::To>( \
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reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
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}
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MAKE_OPEN_HANDLE(Template, TemplateInfo)
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MAKE_OPEN_HANDLE(FunctionTemplate, FunctionTemplateInfo)
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MAKE_OPEN_HANDLE(ObjectTemplate, ObjectTemplateInfo)
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MAKE_OPEN_HANDLE(Signature, SignatureInfo)
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MAKE_OPEN_HANDLE(TypeSwitch, TypeSwitchInfo)
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MAKE_OPEN_HANDLE(Data, Object)
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MAKE_OPEN_HANDLE(RegExp, JSRegExp)
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MAKE_OPEN_HANDLE(Object, JSObject)
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MAKE_OPEN_HANDLE(Array, JSArray)
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MAKE_OPEN_HANDLE(String, String)
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MAKE_OPEN_HANDLE(Script, Object)
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MAKE_OPEN_HANDLE(Function, JSFunction)
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MAKE_OPEN_HANDLE(Message, JSObject)
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MAKE_OPEN_HANDLE(Context, Context)
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MAKE_OPEN_HANDLE(External, Foreign)
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MAKE_OPEN_HANDLE(StackTrace, JSArray)
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MAKE_OPEN_HANDLE(StackFrame, JSObject)
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#undef MAKE_OPEN_HANDLE
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namespace internal {
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// Tracks string usage to help make better decisions when
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// externalizing strings.
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//
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// Implementation note: internally this class only tracks fresh
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// strings and keeps a single use counter for them.
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class StringTracker {
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public:
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// Records that the given string's characters were copied to some
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// external buffer. If this happens often we should honor
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// externalization requests for the string.
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void RecordWrite(Handle<String> string) {
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Address address = reinterpret_cast<Address>(*string);
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Address top = isolate_->heap()->NewSpaceTop();
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if (IsFreshString(address, top)) {
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IncrementUseCount(top);
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}
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}
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// Estimates freshness and use frequency of the given string based
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// on how close it is to the new space top and the recorded usage
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// history.
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inline bool IsFreshUnusedString(Handle<String> string) {
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Address address = reinterpret_cast<Address>(*string);
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Address top = isolate_->heap()->NewSpaceTop();
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return IsFreshString(address, top) && IsUseCountLow(top);
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}
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private:
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StringTracker() : use_count_(0), last_top_(NULL), isolate_(NULL) { }
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static inline bool IsFreshString(Address string, Address top) {
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|
|
return top - kFreshnessLimit <= string && string <= top;
|
|
|
|
}
|
|
|
|
|
|
|
|
inline bool IsUseCountLow(Address top) {
|
|
|
|
if (last_top_ != top) return true;
|
|
|
|
return use_count_ < kUseLimit;
|
|
|
|
}
|
|
|
|
|
|
|
|
inline void IncrementUseCount(Address top) {
|
|
|
|
if (last_top_ != top) {
|
|
|
|
use_count_ = 0;
|
|
|
|
last_top_ = top;
|
|
|
|
}
|
|
|
|
++use_count_;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Single use counter shared by all fresh strings.
|
|
|
|
int use_count_;
|
|
|
|
|
|
|
|
// Last new space top when the use count above was valid.
|
|
|
|
Address last_top_;
|
|
|
|
|
|
|
|
Isolate* isolate_;
|
|
|
|
|
|
|
|
// How close to the new space top a fresh string has to be.
|
|
|
|
static const int kFreshnessLimit = 1024;
|
|
|
|
|
|
|
|
// The number of uses required to consider a string useful.
|
|
|
|
static const int kUseLimit = 32;
|
|
|
|
|
|
|
|
friend class Isolate;
|
|
|
|
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(StringTracker);
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
// This class is here in order to be able to declare it a friend of
|
|
|
|
// HandleScope. Moving these methods to be members of HandleScope would be
|
|
|
|
// neat in some ways, but it would expose internal implementation details in
|
|
|
|
// our public header file, which is undesirable.
|
|
|
|
//
|
|
|
|
// An isolate has a single instance of this class to hold the current thread's
|
|
|
|
// data. In multithreaded V8 programs this data is copied in and out of storage
|
|
|
|
// so that the currently executing thread always has its own copy of this
|
|
|
|
// data.
|
|
|
|
class HandleScopeImplementer {
|
|
|
|
public:
|
|
|
|
explicit HandleScopeImplementer(Isolate* isolate)
|
|
|
|
: isolate_(isolate),
|
|
|
|
blocks_(0),
|
|
|
|
entered_contexts_(0),
|
|
|
|
saved_contexts_(0),
|
|
|
|
spare_(NULL),
|
|
|
|
call_depth_(0) { }
|
|
|
|
|
|
|
|
~HandleScopeImplementer() {
|
|
|
|
DeleteArray(spare_);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Threading support for handle data.
|
|
|
|
static int ArchiveSpacePerThread();
|
|
|
|
char* RestoreThread(char* from);
|
|
|
|
char* ArchiveThread(char* to);
|
|
|
|
void FreeThreadResources();
|
|
|
|
|
|
|
|
// Garbage collection support.
|
|
|
|
void Iterate(v8::internal::ObjectVisitor* v);
|
|
|
|
static char* Iterate(v8::internal::ObjectVisitor* v, char* data);
|
|
|
|
|
|
|
|
|
|
|
|
inline internal::Object** GetSpareOrNewBlock();
|
|
|
|
inline void DeleteExtensions(internal::Object** prev_limit);
|
|
|
|
|
|
|
|
inline void IncrementCallDepth() {call_depth_++;}
|
|
|
|
inline void DecrementCallDepth() {call_depth_--;}
|
|
|
|
inline bool CallDepthIsZero() { return call_depth_ == 0; }
|
|
|
|
|
|
|
|
inline void EnterContext(Handle<Object> context);
|
|
|
|
inline bool LeaveLastContext();
|
|
|
|
|
|
|
|
// Returns the last entered context or an empty handle if no
|
|
|
|
// contexts have been entered.
|
|
|
|
inline Handle<Object> LastEnteredContext();
|
|
|
|
|
|
|
|
inline void SaveContext(Context* context);
|
|
|
|
inline Context* RestoreContext();
|
|
|
|
inline bool HasSavedContexts();
|
|
|
|
|
|
|
|
inline List<internal::Object**>* blocks() { return &blocks_; }
|
|
|
|
|
|
|
|
private:
|
|
|
|
void ResetAfterArchive() {
|
|
|
|
blocks_.Initialize(0);
|
|
|
|
entered_contexts_.Initialize(0);
|
|
|
|
saved_contexts_.Initialize(0);
|
|
|
|
spare_ = NULL;
|
|
|
|
call_depth_ = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void Free() {
|
|
|
|
ASSERT(blocks_.length() == 0);
|
|
|
|
ASSERT(entered_contexts_.length() == 0);
|
|
|
|
ASSERT(saved_contexts_.length() == 0);
|
|
|
|
blocks_.Free();
|
|
|
|
entered_contexts_.Free();
|
|
|
|
saved_contexts_.Free();
|
|
|
|
if (spare_ != NULL) {
|
|
|
|
DeleteArray(spare_);
|
|
|
|
spare_ = NULL;
|
|
|
|
}
|
|
|
|
ASSERT(call_depth_ == 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
Isolate* isolate_;
|
|
|
|
List<internal::Object**> blocks_;
|
|
|
|
// Used as a stack to keep track of entered contexts.
|
|
|
|
List<Handle<Object> > entered_contexts_;
|
|
|
|
// Used as a stack to keep track of saved contexts.
|
|
|
|
List<Context*> saved_contexts_;
|
|
|
|
Object** spare_;
|
|
|
|
int call_depth_;
|
|
|
|
// This is only used for threading support.
|
|
|
|
v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
|
|
|
|
|
|
|
|
void IterateThis(ObjectVisitor* v);
|
|
|
|
char* RestoreThreadHelper(char* from);
|
|
|
|
char* ArchiveThreadHelper(char* to);
|
|
|
|
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(HandleScopeImplementer);
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static const int kHandleBlockSize = v8::internal::KB - 2; // fit in one page
|
|
|
|
|
|
|
|
|
|
|
|
void HandleScopeImplementer::SaveContext(Context* context) {
|
|
|
|
saved_contexts_.Add(context);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
Context* HandleScopeImplementer::RestoreContext() {
|
|
|
|
return saved_contexts_.RemoveLast();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool HandleScopeImplementer::HasSavedContexts() {
|
|
|
|
return !saved_contexts_.is_empty();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void HandleScopeImplementer::EnterContext(Handle<Object> context) {
|
|
|
|
entered_contexts_.Add(context);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool HandleScopeImplementer::LeaveLastContext() {
|
|
|
|
if (entered_contexts_.is_empty()) return false;
|
|
|
|
entered_contexts_.RemoveLast();
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
Handle<Object> HandleScopeImplementer::LastEnteredContext() {
|
|
|
|
if (entered_contexts_.is_empty()) return Handle<Object>::null();
|
|
|
|
return entered_contexts_.last();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// If there's a spare block, use it for growing the current scope.
|
|
|
|
internal::Object** HandleScopeImplementer::GetSpareOrNewBlock() {
|
|
|
|
internal::Object** block = (spare_ != NULL) ?
|
|
|
|
spare_ :
|
|
|
|
NewArray<internal::Object*>(kHandleBlockSize);
|
|
|
|
spare_ = NULL;
|
|
|
|
return block;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void HandleScopeImplementer::DeleteExtensions(internal::Object** prev_limit) {
|
|
|
|
while (!blocks_.is_empty()) {
|
|
|
|
internal::Object** block_start = blocks_.last();
|
|
|
|
internal::Object** block_limit = block_start + kHandleBlockSize;
|
|
|
|
#ifdef DEBUG
|
|
|
|
// NoHandleAllocation may make the prev_limit to point inside the block.
|
|
|
|
if (block_start <= prev_limit && prev_limit <= block_limit) break;
|
|
|
|
#else
|
|
|
|
if (prev_limit == block_limit) break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
blocks_.RemoveLast();
|
|
|
|
#ifdef DEBUG
|
|
|
|
v8::ImplementationUtilities::ZapHandleRange(block_start, block_limit);
|
|
|
|
#endif
|
|
|
|
if (spare_ != NULL) {
|
|
|
|
DeleteArray(spare_);
|
|
|
|
}
|
|
|
|
spare_ = block_start;
|
|
|
|
}
|
|
|
|
ASSERT((blocks_.is_empty() && prev_limit == NULL) ||
|
|
|
|
(!blocks_.is_empty() && prev_limit != NULL));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
class Testing {
|
|
|
|
public:
|
|
|
|
static v8::Testing::StressType stress_type() { return stress_type_; }
|
|
|
|
static void set_stress_type(v8::Testing::StressType stress_type) {
|
|
|
|
stress_type_ = stress_type;
|
|
|
|
}
|
|
|
|
|
|
|
|
private:
|
|
|
|
static v8::Testing::StressType stress_type_;
|
|
|
|
};
|
|
|
|
|
|
|
|
} } // namespace v8::internal
|
|
|
|
|
|
|
|
#endif // V8_API_H_
|