v8/src/api.h
2009-07-13 09:17:04 +00:00

456 lines
15 KiB
C++

// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_API_H_
#define V8_API_H_
#include "apiutils.h"
#include "factory.h"
namespace v8 {
// Constants used in the implementation of the API. The most natural thing
// would usually be to place these with the classes that use them, but
// we want to keep them out of v8.h because it is an externally
// visible file.
class Consts {
public:
enum TemplateType {
FUNCTION_TEMPLATE = 0,
OBJECT_TEMPLATE = 1
};
};
// Utilities for working with neander-objects, primitive
// env-independent JSObjects used by the api.
class NeanderObject {
public:
explicit NeanderObject(int size);
inline NeanderObject(v8::internal::Handle<v8::internal::Object> obj);
inline NeanderObject(v8::internal::Object* obj);
inline v8::internal::Object* get(int index);
inline void set(int index, v8::internal::Object* value);
inline v8::internal::Handle<v8::internal::JSObject> value() { return value_; }
int size();
private:
v8::internal::Handle<v8::internal::JSObject> value_;
};
// Utilities for working with neander-arrays, a simple extensible
// array abstraction built on neander-objects.
class NeanderArray {
public:
NeanderArray();
inline NeanderArray(v8::internal::Handle<v8::internal::Object> obj);
inline v8::internal::Handle<v8::internal::JSObject> value() {
return obj_.value();
}
void add(v8::internal::Handle<v8::internal::Object> value);
int length();
v8::internal::Object* get(int index);
// Change the value at an index to undefined value. If the index is
// out of bounds, the request is ignored. Returns the old value.
void set(int index, v8::internal::Object* value);
private:
NeanderObject obj_;
};
NeanderObject::NeanderObject(v8::internal::Handle<v8::internal::Object> obj)
: value_(v8::internal::Handle<v8::internal::JSObject>::cast(obj)) { }
NeanderObject::NeanderObject(v8::internal::Object* obj)
: value_(v8::internal::Handle<v8::internal::JSObject>(
v8::internal::JSObject::cast(obj))) { }
NeanderArray::NeanderArray(v8::internal::Handle<v8::internal::Object> obj)
: obj_(obj) { }
v8::internal::Object* NeanderObject::get(int offset) {
ASSERT(value()->HasFastElements());
return v8::internal::FixedArray::cast(value()->elements())->get(offset);
}
void NeanderObject::set(int offset, v8::internal::Object* value) {
ASSERT(value_->HasFastElements());
v8::internal::FixedArray::cast(value_->elements())->set(offset, value);
}
template <typename T> static inline T ToCData(v8::internal::Object* obj) {
STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
return reinterpret_cast<T>(
reinterpret_cast<intptr_t>(v8::internal::Proxy::cast(obj)->proxy()));
}
template <typename T>
static inline v8::internal::Handle<v8::internal::Object> FromCData(T obj) {
STATIC_ASSERT(sizeof(T) == sizeof(v8::internal::Address));
return v8::internal::Factory::NewProxy(
reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(obj)));
}
v8::Arguments::Arguments(v8::Local<v8::Value> data,
v8::Local<v8::Object> holder,
v8::Local<v8::Function> callee,
bool is_construct_call,
void** values, int length)
: data_(data), holder_(holder), callee_(callee),
is_construct_call_(is_construct_call),
values_(values), length_(length) { }
enum ExtensionTraversalState {
UNVISITED, VISITED, INSTALLED
};
class RegisteredExtension {
public:
explicit RegisteredExtension(Extension* extension);
static void Register(RegisteredExtension* that);
Extension* extension() { return extension_; }
RegisteredExtension* next() { return next_; }
RegisteredExtension* next_auto() { return next_auto_; }
ExtensionTraversalState state() { return state_; }
void set_state(ExtensionTraversalState value) { state_ = value; }
static RegisteredExtension* first_extension() { return first_extension_; }
private:
Extension* extension_;
RegisteredExtension* next_;
RegisteredExtension* next_auto_;
ExtensionTraversalState state_;
static RegisteredExtension* first_extension_;
static RegisteredExtension* first_auto_extension_;
};
class Utils {
public:
static bool ReportApiFailure(const char* location, const char* message);
static Local<FunctionTemplate> ToFunctionTemplate(NeanderObject obj);
static Local<ObjectTemplate> ToObjectTemplate(NeanderObject obj);
static inline Local<Context> ToLocal(
v8::internal::Handle<v8::internal::Context> obj);
static inline Local<Value> ToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Function> ToLocal(
v8::internal::Handle<v8::internal::JSFunction> obj);
static inline Local<String> ToLocal(
v8::internal::Handle<v8::internal::String> obj);
static inline Local<Object> ToLocal(
v8::internal::Handle<v8::internal::JSObject> obj);
static inline Local<Array> ToLocal(
v8::internal::Handle<v8::internal::JSArray> obj);
static inline Local<External> ToLocal(
v8::internal::Handle<v8::internal::Proxy> obj);
static inline Local<Message> MessageToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Number> NumberToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Integer> IntegerToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<Uint32> Uint32ToLocal(
v8::internal::Handle<v8::internal::Object> obj);
static inline Local<FunctionTemplate> ToLocal(
v8::internal::Handle<v8::internal::FunctionTemplateInfo> obj);
static inline Local<ObjectTemplate> ToLocal(
v8::internal::Handle<v8::internal::ObjectTemplateInfo> obj);
static inline Local<Signature> ToLocal(
v8::internal::Handle<v8::internal::SignatureInfo> obj);
static inline Local<TypeSwitch> ToLocal(
v8::internal::Handle<v8::internal::TypeSwitchInfo> obj);
static inline v8::internal::Handle<v8::internal::TemplateInfo>
OpenHandle(const Template* that);
static inline v8::internal::Handle<v8::internal::FunctionTemplateInfo>
OpenHandle(const FunctionTemplate* that);
static inline v8::internal::Handle<v8::internal::ObjectTemplateInfo>
OpenHandle(const ObjectTemplate* that);
static inline v8::internal::Handle<v8::internal::Object>
OpenHandle(const Data* data);
static inline v8::internal::Handle<v8::internal::JSObject>
OpenHandle(const v8::Object* data);
static inline v8::internal::Handle<v8::internal::JSArray>
OpenHandle(const v8::Array* data);
static inline v8::internal::Handle<v8::internal::String>
OpenHandle(const String* data);
static inline v8::internal::Handle<v8::internal::JSFunction>
OpenHandle(const Script* data);
static inline v8::internal::Handle<v8::internal::JSFunction>
OpenHandle(const Function* data);
static inline v8::internal::Handle<v8::internal::JSObject>
OpenHandle(const Message* message);
static inline v8::internal::Handle<v8::internal::Context>
OpenHandle(const v8::Context* context);
static inline v8::internal::Handle<v8::internal::SignatureInfo>
OpenHandle(const v8::Signature* sig);
static inline v8::internal::Handle<v8::internal::TypeSwitchInfo>
OpenHandle(const v8::TypeSwitch* that);
static inline v8::internal::Handle<v8::internal::Proxy>
OpenHandle(const v8::External* that);
};
template <class T>
static inline T* ToApi(v8::internal::Handle<v8::internal::Object> obj) {
return reinterpret_cast<T*>(obj.location());
}
template <class T>
v8::internal::Handle<T> v8::internal::Handle<T>::EscapeFrom(
v8::HandleScope* scope) {
return Utils::OpenHandle(*scope->Close(Utils::ToLocal(*this)));
}
// Implementations of ToLocal
#define MAKE_TO_LOCAL(Name, From, To) \
Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \
ASSERT(!obj->IsTheHole()); \
return Local<To>(reinterpret_cast<To*>(obj.location())); \
}
MAKE_TO_LOCAL(ToLocal, Context, Context)
MAKE_TO_LOCAL(ToLocal, Object, Value)
MAKE_TO_LOCAL(ToLocal, JSFunction, Function)
MAKE_TO_LOCAL(ToLocal, String, String)
MAKE_TO_LOCAL(ToLocal, JSObject, Object)
MAKE_TO_LOCAL(ToLocal, JSArray, Array)
MAKE_TO_LOCAL(ToLocal, Proxy, External)
MAKE_TO_LOCAL(ToLocal, FunctionTemplateInfo, FunctionTemplate)
MAKE_TO_LOCAL(ToLocal, ObjectTemplateInfo, ObjectTemplate)
MAKE_TO_LOCAL(ToLocal, SignatureInfo, Signature)
MAKE_TO_LOCAL(ToLocal, TypeSwitchInfo, TypeSwitch)
MAKE_TO_LOCAL(MessageToLocal, Object, Message)
MAKE_TO_LOCAL(NumberToLocal, Object, Number)
MAKE_TO_LOCAL(IntegerToLocal, Object, Integer)
MAKE_TO_LOCAL(Uint32ToLocal, Object, Uint32)
#undef MAKE_TO_LOCAL
// Implementations of OpenHandle
#define MAKE_OPEN_HANDLE(From, To) \
v8::internal::Handle<v8::internal::To> Utils::OpenHandle(\
const v8::From* that) { \
return v8::internal::Handle<v8::internal::To>( \
reinterpret_cast<v8::internal::To**>(const_cast<v8::From*>(that))); \
}
MAKE_OPEN_HANDLE(Template, TemplateInfo)
MAKE_OPEN_HANDLE(FunctionTemplate, FunctionTemplateInfo)
MAKE_OPEN_HANDLE(ObjectTemplate, ObjectTemplateInfo)
MAKE_OPEN_HANDLE(Signature, SignatureInfo)
MAKE_OPEN_HANDLE(TypeSwitch, TypeSwitchInfo)
MAKE_OPEN_HANDLE(Data, Object)
MAKE_OPEN_HANDLE(Object, JSObject)
MAKE_OPEN_HANDLE(Array, JSArray)
MAKE_OPEN_HANDLE(String, String)
MAKE_OPEN_HANDLE(Script, JSFunction)
MAKE_OPEN_HANDLE(Function, JSFunction)
MAKE_OPEN_HANDLE(Message, JSObject)
MAKE_OPEN_HANDLE(Context, Context)
MAKE_OPEN_HANDLE(External, Proxy)
#undef MAKE_OPEN_HANDLE
namespace internal {
// 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 external implementation details in
// our public header file, which is undesirable.
//
// There is a singleton instance of this class to hold the per-thread data.
// For 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:
HandleScopeImplementer()
: blocks(0),
entered_contexts_(0),
saved_contexts_(0) {
Initialize();
}
void Initialize() {
blocks.Initialize(0);
entered_contexts_.Initialize(0);
saved_contexts_.Initialize(0);
spare = NULL;
ignore_out_of_memory = false;
call_depth = 0;
}
static HandleScopeImplementer* instance();
// Threading support for handle data.
static int ArchiveSpacePerThread();
static char* RestoreThread(char* from);
static char* ArchiveThread(char* to);
// Garbage collection support.
static void Iterate(v8::internal::ObjectVisitor* v);
static char* Iterate(v8::internal::ObjectVisitor* v, char* data);
inline void** GetSpareOrNewBlock();
inline void DeleteExtensions(int extensions);
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(Handle<Object> context);
inline Handle<Object> RestoreContext();
inline bool HasSavedContexts();
inline List<void**>* Blocks() { return &blocks; }
inline bool IgnoreOutOfMemory() { return ignore_out_of_memory; }
inline void SetIgnoreOutOfMemory(bool value) { ignore_out_of_memory = value; }
private:
List<void**> blocks;
Object** spare;
int call_depth;
// 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<Handle<Object> > saved_contexts_;
bool ignore_out_of_memory;
// This is only used for threading support.
v8::ImplementationUtilities::HandleScopeData handle_scope_data_;
static void Iterate(ObjectVisitor* v,
List<void**>* blocks,
v8::ImplementationUtilities::HandleScopeData* handle_data);
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(Handle<Object> context) {
saved_contexts_.Add(context);
}
Handle<Object> 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.
void** HandleScopeImplementer::GetSpareOrNewBlock() {
void** block = (spare != NULL) ?
reinterpret_cast<void**>(spare) :
NewArray<void*>(kHandleBlockSize);
spare = NULL;
return block;
}
void HandleScopeImplementer::DeleteExtensions(int extensions) {
if (spare != NULL) {
DeleteArray(spare);
spare = NULL;
}
for (int i = extensions; i > 1; --i) {
void** block = blocks.RemoveLast();
#ifdef DEBUG
v8::ImplementationUtilities::ZapHandleRange(block,
&block[kHandleBlockSize]);
#endif
DeleteArray(block);
}
spare = reinterpret_cast<Object**>(blocks.RemoveLast());
#ifdef DEBUG
v8::ImplementationUtilities::ZapHandleRange(
reinterpret_cast<void**>(spare),
reinterpret_cast<void**>(&spare[kHandleBlockSize]));
#endif
}
} } // namespace v8::internal
#endif // V8_API_H_