// 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. http://www.foxitsoftware.com // 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" #ifdef PDF_ENABLE_XFA // 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. enum FXJSOBJTYPE { 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> { public: 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 = v8::kWeakWithInternalFields; 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 { public: typedef v8::GlobalValueMap<void*, v8::Object, V8TemplateMapTraits> MapType; explicit V8TemplateMap(v8::Isolate* isolate); ~V8TemplateMap(); void set(void* key, v8::Local<v8::Object> handle); friend class V8TemplateMapTraits; private: MapType m_map; }; class FXJS_PerIsolateData { public: ~FXJS_PerIsolateData(); static void SetUp(v8::Isolate* pIsolate); static FXJS_PerIsolateData* Get(v8::Isolate* pIsolate); std::vector<std::unique_ptr<CFXJS_ObjDefinition>> m_ObjectDefnArray; #ifdef PDF_ENABLE_XFA std::unique_ptr<CFXJSE_RuntimeData> m_pFXJSERuntimeData; #endif // PDF_ENABLE_XFA std::unique_ptr<V8TemplateMap> m_pDynamicObjsMap; protected: 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 { public: 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, FXJSOBJTYPE eObjType, 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); protected: CFXJS_Engine(); private: std::vector<v8::Global<v8::Object>*> m_StaticObjects; }; #endif // FXJS_FXJS_V8_H_