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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc.
// FXJS_V8 is a layer that makes it easier to define native objects in V8, but
// has no knowledge of PDF-specific native objects. It could in theory be used
// to implement other sets of native objects.
// PDFium code should include this file rather than including V8 headers
// directly.
#ifndef FXJS_FXJS_V8_H_
#define FXJS_FXJS_V8_H_
#include <v8-util.h>
#include <v8.h>
#include <map>
#include <memory>
#include <vector>
#include "core/fxcrt/fx_string.h"
#include "fxjs/cjs_v8.h"
// Header for CFXJSE_RuntimeData. FXJS_V8 doesn't interpret this class,
// it is just passed along to XFA.
#include "fxjs/cfxjse_runtimedata.h"
#endif // PDF_ENABLE_XFA
class CFXJS_Engine;
class CFXJS_ObjDefinition;
// FXJS_V8 places no restrictions on this class; it merely passes it
// on to caller-provided methods.
class IJS_EventContext; // A description of the event that caused JS execution.
FXJSOBJTYPE_DYNAMIC = 0, // Created by native method and returned to JS.
FXJSOBJTYPE_STATIC, // Created by init and hung off of global object.
FXJSOBJTYPE_GLOBAL, // The global object itself (may only appear once).
struct FXJSErr {
const wchar_t* message;
const wchar_t* srcline;
unsigned linnum;
// Global weak map to save dynamic objects.
class V8TemplateMapTraits : public v8::StdMapTraits<void*, v8::Object> {
typedef v8::GlobalValueMap<void*, v8::Object, V8TemplateMapTraits> MapType;
typedef void WeakCallbackDataType;
static WeakCallbackDataType*
WeakCallbackParameter(MapType* map, void* key, v8::Local<v8::Object> value) {
return key;
static MapType* MapFromWeakCallbackInfo(
const v8::WeakCallbackInfo<WeakCallbackDataType>&);
static void* KeyFromWeakCallbackInfo(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {
return data.GetParameter();
static const v8::PersistentContainerCallbackType kCallbackType =
static void DisposeWeak(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {}
static void OnWeakCallback(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {}
static void Dispose(v8::Isolate* isolate,
v8::Global<v8::Object> value,
void* key);
static void DisposeCallbackData(WeakCallbackDataType* callbackData) {}
class V8TemplateMap {
typedef v8::GlobalValueMap<void*, v8::Object, V8TemplateMapTraits> MapType;
explicit V8TemplateMap(v8::Isolate* isolate);
void set(void* key, v8::Local<v8::Object> handle);
friend class V8TemplateMapTraits;
MapType m_map;
class FXJS_PerIsolateData {
static void SetUp(v8::Isolate* pIsolate);
static FXJS_PerIsolateData* Get(v8::Isolate* pIsolate);
std::vector<std::unique_ptr<CFXJS_ObjDefinition>> m_ObjectDefnArray;
std::unique_ptr<CFXJSE_RuntimeData> m_pFXJSERuntimeData;
#endif // PDF_ENABLE_XFA
std::unique_ptr<V8TemplateMap> m_pDynamicObjsMap;
explicit FXJS_PerIsolateData(v8::Isolate* pIsolate);
class FXJS_ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
static const size_t kMaxAllowedBytes = 0x10000000;
void* Allocate(size_t length) override;
void* AllocateUninitialized(size_t length) override;
void Free(void* data, size_t length) override;
void FXJS_Initialize(unsigned int embedderDataSlot, v8::Isolate* pIsolate);
void FXJS_Release();
// Gets the global isolate set by FXJS_Initialize(), or makes a new one each
// time if there is no such isolate. Returns true if a new isolate had to be
// created.
bool FXJS_GetIsolate(v8::Isolate** pResultIsolate);
// Get the global isolate's ref count.
size_t FXJS_GlobalIsolateRefCount();
class CFXJS_Engine : public CJS_V8 {
explicit CFXJS_Engine(v8::Isolate* pIsolate);
~CFXJS_Engine() override;
using Constructor = void (*)(CFXJS_Engine* pEngine,
v8::Local<v8::Object> obj);
using Destructor = void (*)(CFXJS_Engine* pEngine, v8::Local<v8::Object> obj);
static CFXJS_Engine* CurrentEngineFromIsolate(v8::Isolate* pIsolate);
static int GetObjDefnID(v8::Local<v8::Object> pObj);
// Always returns a valid, newly-created objDefnID.
int DefineObj(const char* sObjName,
Constructor pConstructor,
Destructor pDestructor);
void DefineObjMethod(int nObjDefnID,
const char* sMethodName,
v8::FunctionCallback pMethodCall);
void DefineObjProperty(int nObjDefnID,
const char* sPropName,
v8::AccessorGetterCallback pPropGet,
v8::AccessorSetterCallback pPropPut);
void DefineObjAllProperties(int nObjDefnID,
v8::NamedPropertyQueryCallback pPropQurey,
v8::NamedPropertyGetterCallback pPropGet,
v8::NamedPropertySetterCallback pPropPut,
v8::NamedPropertyDeleterCallback pPropDel);
void DefineObjConst(int nObjDefnID,
const char* sConstName,
v8::Local<v8::Value> pDefault);
void DefineGlobalMethod(const char* sMethodName,
v8::FunctionCallback pMethodCall);
void DefineGlobalConst(const wchar_t* sConstName,
v8::FunctionCallback pConstGetter);
// Called after FXJS_Define* calls made.
void InitializeEngine();
void ReleaseEngine();
// Called after FXJS_InitializeEngine call made.
int Execute(const WideString& script, FXJSErr* perror);
v8::Local<v8::Object> GetThisObj();
v8::Local<v8::Object> NewFxDynamicObj(int nObjDefnID, bool bStatic = false);
// Native object binding.
void SetObjectPrivate(v8::Local<v8::Object> pObj, void* p);
void* GetObjectPrivate(v8::Local<v8::Object> pObj);
static void FreeObjectPrivate(void* p);
static void FreeObjectPrivate(v8::Local<v8::Object> pObj);
void Error(const WideString& message);
std::vector<v8::Global<v8::Object>*> m_StaticObjects;
#endif // FXJS_FXJS_V8_H_