Yves
e818b08344
* Adds additional overloads/specializations which are required when passing JS::Handle<T>/JS::MutableHandle<T> types to different functions. * Replaces GetPropertyJS with a GetProperty specialization. * Allows us to avoid the implementation of ToJSVal specializations for JS::Value and JS::HandleValue. Such conversions should only happen if there's no way around it and if you are aware of it. * Adds test to make sure that all potentially required specializations with custom implementations are instantiated. This should help prevent introducing bugs in temporarily unused code. Refs #2415 This was SVN commit r15567.
632 lines
21 KiB
C++
632 lines
21 KiB
C++
/* Copyright (C) 2012 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SCRIPTINTERFACE
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#define INCLUDED_SCRIPTINTERFACE
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#include <memory>
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#include <vector>
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#include <string>
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#include "ScriptTypes.h"
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#include "ScriptVal.h"
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#include "ps/Errors.h"
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ERROR_GROUP(Scripting);
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ERROR_TYPE(Scripting, SetupFailed);
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ERROR_SUBGROUP(Scripting, LoadFile);
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ERROR_TYPE(Scripting_LoadFile, OpenFailed);
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ERROR_TYPE(Scripting_LoadFile, EvalErrors);
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ERROR_TYPE(Scripting, ConversionFailed);
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ERROR_TYPE(Scripting, CallFunctionFailed);
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ERROR_TYPE(Scripting, RegisterFunctionFailed);
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ERROR_TYPE(Scripting, DefineConstantFailed);
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ERROR_TYPE(Scripting, CreateObjectFailed);
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ERROR_TYPE(Scripting, TypeDoesNotExist);
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ERROR_SUBGROUP(Scripting, DefineType);
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ERROR_TYPE(Scripting_DefineType, AlreadyExists);
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ERROR_TYPE(Scripting_DefineType, CreationFailed);
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#include "lib/file/vfs/vfs_path.h"
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#include "ps/Profile.h"
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#include "ps/utf16string.h"
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#include <boost/random/linear_congruential.hpp>
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class AutoGCRooter;
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// Set the maximum number of function arguments that can be handled
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// (This should be as small as possible (for compiler efficiency),
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// but as large as necessary for all wrapped functions)
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#define SCRIPT_INTERFACE_MAX_ARGS 8
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// TODO: what's a good default?
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#define DEFAULT_RUNTIME_SIZE 16 * 1024 * 1024
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struct ScriptInterface_impl;
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class ScriptRuntime;
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extern shared_ptr<ScriptRuntime> g_ScriptRuntime;
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class CDebuggingServer;
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/**
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* Abstraction around a SpiderMonkey JSContext.
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*
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* Thread-safety:
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* - May be used in non-main threads.
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* - Each ScriptInterface must be created, used, and destroyed, all in a single thread
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* (it must never be shared between threads).
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*/
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class ScriptInterface
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{
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public:
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/**
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* Returns a runtime, which can used to initialise any number of
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* ScriptInterfaces contexts. Values created in one context may be used
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* in any other context from the same runtime (but not any other runtime).
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* Each runtime should only ever be used on a single thread.
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* @param runtimeSize Maximum size in bytes of the new runtime
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*/
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static shared_ptr<ScriptRuntime> CreateRuntime(int runtimeSize = DEFAULT_RUNTIME_SIZE);
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/**
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* Constructor.
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* @param nativeScopeName Name of global object that functions (via RegisterFunction) will
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* be placed into, as a scoping mechanism; typically "Engine"
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* @param debugName Name of this interface for CScriptStats purposes.
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* @param runtime ScriptRuntime to use when initializing this interface.
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*/
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ScriptInterface(const char* nativeScopeName, const char* debugName, const shared_ptr<ScriptRuntime>& runtime);
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~ScriptInterface();
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/**
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* Shut down the JS system to clean up memory. Must only be called when there
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* are no ScriptInterfaces alive.
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*/
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static void ShutDown();
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struct CxPrivate
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{
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ScriptInterface* pScriptInterface; // the ScriptInterface object the current context belongs to
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void* pCBData; // meant to be used as the "this" object for callback functions
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} m_CxPrivate;
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void SetCallbackData(void* pCBData);
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static CxPrivate* GetScriptInterfaceAndCBData(JSContext* cx);
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JSContext* GetContext() const;
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JSRuntime* GetJSRuntime() const;
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shared_ptr<ScriptRuntime> GetRuntime() const;
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/**
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* Load global scripts that most script contexts need,
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* located in the /globalscripts directory. VFS must be initialized.
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*/
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bool LoadGlobalScripts();
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enum CACHED_VAL { CACHE_VECTOR2DPROTO, CACHE_VECTOR3DPROTO };
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CScriptValRooted GetCachedValue(CACHED_VAL valueIdentifier);
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/**
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* Replace the default JS random number geenrator with a seeded, network-sync'd one.
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*/
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bool ReplaceNondeterministicRNG(boost::rand48& rng);
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/**
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* Call a constructor function, equivalent to JS "new ctor(arg)".
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* @return The new object; or JSVAL_VOID on failure, and logs an error message
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*/
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jsval CallConstructor(jsval ctor, uint argc, jsval argv);
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/**
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* Create an object as with CallConstructor except don't actually execute the
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* constructor function.
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* @return The new object; or JSVAL_VOID on failure, and logs an error message
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*/
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jsval NewObjectFromConstructor(jsval ctor);
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/**
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* Call the named property on the given object, with void return type and 0 arguments
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*/
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bool CallFunctionVoid(jsval val, const char* name);
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/**
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* Call the named property on the given object, with void return type and 1 argument
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*/
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template<typename T0>
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bool CallFunctionVoid(jsval val, const char* name, const T0& a0);
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/**
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* Call the named property on the given object, with void return type and 2 arguments
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*/
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template<typename T0, typename T1>
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bool CallFunctionVoid(jsval val, const char* name, const T0& a0, const T1& a1);
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/**
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* Call the named property on the given object, with void return type and 3 arguments
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*/
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template<typename T0, typename T1, typename T2>
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bool CallFunctionVoid(jsval val, const char* name, const T0& a0, const T1& a1, const T2& a2);
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JSObject* CreateCustomObject(const std::string & typeName);
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void DefineCustomObjectType(JSClass *clasp, JSNative constructor, uint minArgs, JSPropertySpec *ps, JSFunctionSpec *fs, JSPropertySpec *static_ps, JSFunctionSpec *static_fs);
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jsval GetGlobalObject();
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JSClass* GetGlobalClass();
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/**
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* Set the named property on the global object.
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* If @p replace is true, an existing property will be overwritten; otherwise attempts
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* to set an already-defined value will fail.
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*/
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template<typename T>
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bool SetGlobal(const char* name, const T& value, bool replace = false);
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/**
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* Set the named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetProperty(jsval obj, const char* name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Set the named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetProperty(jsval obj, const wchar_t* name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Set the integer-named property on the given object.
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* Optionally makes it {ReadOnly, DontDelete, DontEnum}.
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*/
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template<typename T>
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bool SetPropertyInt(jsval obj, int name, const T& value, bool constant = false, bool enumerate = true);
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/**
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* Get the named property on the given object.
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*/
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template<typename T>
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bool GetProperty(jsval obj, const char* name, T& out);
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/**
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* Get the named property of the given object.
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* This overload takes JS::Rooted<T>* and converts it to JS::MutableHandle<T> in the function body because implicit
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* conversion is not supported for templates.
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* It's used in the case where a JS::Rooted<T> gets created inside the same function and then passed to GetProperty as
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* |out| using the & operator.
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*/
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template<typename T>
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bool GetProperty(jsval obj, const char* name, JS::Rooted<T>* out);
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/**
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* Get the named property of the given object.
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* This overload gets used in the case when you don't need conversion from a JS::Rooted<T>* and pass JS::MutableHandle<T>
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* to GetProperty as |out| parameter directly (usually when you get it as a function parameter).
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*/
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template<typename T>
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bool GetProperty(jsval obj, const char* name, JS::MutableHandle<T> out);
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/**
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* Get the integer-named property on the given object.
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*/
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template<typename T>
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bool GetPropertyInt(jsval obj, int name, T& out);
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/**
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* Get the integer-named property on the given object.
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* This version is for taking JS::MutableHandle<T> out parameters. Check the comment for GetProperty for
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* background information
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*/
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template<typename T>
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bool GetPropertyInt(jsval obj, int name, JS::Rooted<T>* out);
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/**
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* Get the named property of the given object.
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* This overload gets used in the case when you don't need conversion from a JS::Rooted<T>* and pass JS::MutableHandle<T>
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* to GetPropertyInt as |out| parameter directly (usually when you get it as a function parameter).
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*/
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template<typename T>
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bool GetPropertyInt(jsval obj, int name, JS::MutableHandle<T> out);
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/**
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* Check the named property has been defined on the given object.
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*/
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bool HasProperty(jsval obj, const char* name);
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bool EnumeratePropertyNamesWithPrefix(JS::HandleValue objVal, const char* prefix, std::vector<std::string>& out);
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bool SetPrototype(JS::HandleValue obj, JS::HandleValue proto);
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bool FreezeObject(jsval obj, bool deep);
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bool Eval(const char* code);
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template<typename CHAR> bool Eval(const CHAR* code, JS::MutableHandleValue out);
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template<typename T, typename CHAR> bool Eval(const CHAR* code, T& out);
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std::wstring ToString(jsval obj, bool pretty = false);
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/**
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* Parse a UTF-8-encoded JSON string. Returns the undefined value on error.
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*/
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CScriptValRooted ParseJSON(const std::string& string_utf8);
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/**
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* Read a JSON file. Returns the undefined value on error.
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*/
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CScriptValRooted ReadJSONFile(const VfsPath& path);
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/**
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* Stringify to a JSON string, UTF-8 encoded. Returns an empty string on error.
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*/
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std::string StringifyJSON(jsval obj, bool indent = true);
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/**
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* Report the given error message through the JS error reporting mechanism,
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* and throw a JS exception. (Callers can check IsPendingException, and must
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* return JS_FALSE in that case to propagate the exception.)
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*/
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void ReportError(const char* msg);
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/**
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* Load and execute the given script in a new function scope.
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* @param filename Name for debugging purposes (not used to load the file)
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* @param code JS code to execute
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadScript(const VfsPath& filename, const std::string& code);
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/**
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* Load and execute the given script in the global scope.
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* @param filename Name for debugging purposes (not used to load the file)
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* @param code JS code to execute
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadGlobalScript(const VfsPath& filename, const std::wstring& code);
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/**
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* Load and execute the given script in the global scope.
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* @return true on successful compilation and execution; false otherwise
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*/
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bool LoadGlobalScriptFile(const VfsPath& path);
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/**
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* Construct a new value (usable in this ScriptInterface's context) by cloning
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* a value from a different context.
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* Complex values (functions, XML, etc) won't be cloned correctly, but basic
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* types and cyclic references should be fine.
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*/
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jsval CloneValueFromOtherContext(ScriptInterface& otherContext, jsval val);
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/**
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* Convert a jsval to a C++ type. (This might trigger GC.)
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*/
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template<typename T> static bool FromJSVal(JSContext* cx, const JS::HandleValue val, T& ret);
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/**
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* Convert a C++ type to a jsval. (This might trigger GC. The return
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* value must be rooted if you don't want it to be collected.)
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* NOTE: We are passing the JS::Value by reference instead of returning it by value.
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* The reason is a memory corruption problem that appears to be caused by a bug in Visual Studio.
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* Details here: http://www.wildfiregames.com/forum/index.php?showtopic=17289&p=285921
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*/
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template<typename T> static void ToJSVal(JSContext* cx, JS::MutableHandleValue ret, T const& val);
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AutoGCRooter* ReplaceAutoGCRooter(AutoGCRooter* rooter);
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/**
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* Dump some memory heap debugging information to stderr.
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*/
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void DumpHeap();
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/**
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* MaybeGC tries to determine whether garbage collection in cx's runtime would free up enough memory to be worth the amount of time it would take.
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* This calls JS_MaybeGC directly, which does not do incremental GC. Usually you should prefer MaybeIncrementalRuntimeGC.
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*/
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void MaybeGC();
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/**
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* MaybeIncrementalRuntimeGC tries to determine whether a runtime-wide garbage collection would free up enough memory to
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* be worth the amount of time it would take. It does this with our own logic and NOT some predefined JSAPI logic because
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* such functionality currently isn't available out of the box.
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* It does incremental GC which means it will collect one slice each time it's called until the garbage collection is done.
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* This can and should be called quite regularly. It shouldn't cost much performance because it tries to run a GC only if
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* necessary.
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*/
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void MaybeIncrementalRuntimeGC();
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/**
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* Triggers a full non-incremental garbage collection immediately. That should only be required in special cases and normally
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* you should try to use MaybeIncrementalRuntimeGC instead.
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*/
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void ForceGC();
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/**
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* MathRandom (this function) calls the random number generator assigned to this ScriptInterface instance and
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* returns the generated number.
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* Math_random (with underscore, not this function) is a global function, but different random number generators can be
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* stored per ScriptInterface. It calls MathRandom of the current ScriptInterface instance.
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*/
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bool MathRandom(double& nbr);
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/**
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* Structured clones are a way to serialize 'simple' JS values into a buffer
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* that can safely be passed between contexts and runtimes and threads.
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* A StructuredClone can be stored and read multiple times if desired.
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* We wrap them in shared_ptr so memory management is automatic and
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* thread-safe.
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*/
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class StructuredClone
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{
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NONCOPYABLE(StructuredClone);
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public:
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StructuredClone();
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~StructuredClone();
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u64* m_Data;
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size_t m_Size;
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};
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shared_ptr<StructuredClone> WriteStructuredClone(jsval v);
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jsval ReadStructuredClone(const shared_ptr<StructuredClone>& ptr);
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/**
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* Converts |a| if needed and assigns it to |handle|.
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* This is meant for use in other templates where we want to use the same code for JS::RootedValue&/JS::HandleValue and
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* other types. Note that functions are meant to take JS::HandleValue instead of JS::RootedValue&, but this implicit
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* conversion does not work for templates (exact type matches required for type deduction).
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* A similar functionality could also be implemented as a ToJSVal specialization. The current approach was preferred
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* because "conversions" from JS::HandleValue to JS::MutableHandleValue are unusual and should not happen "by accident".
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*/
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template <typename T>
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void AssignOrToJSVal(JS::MutableHandleValue handle, const T& a);
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private:
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bool CallFunction_(JS::HandleValue val, const char* name, uint argc, jsval* argv, JS::MutableHandleValue ret);
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bool Eval_(const char* code, JS::MutableHandleValue ret);
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bool Eval_(const wchar_t* code, JS::MutableHandleValue ret);
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bool SetGlobal_(const char* name, jsval value, bool replace);
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bool SetProperty_(jsval obj, const char* name, jsval value, bool readonly, bool enumerate);
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bool SetProperty_(jsval obj, const wchar_t* name, jsval value, bool readonly, bool enumerate);
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bool SetPropertyInt_(jsval obj, int name, jsval value, bool readonly, bool enumerate);
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bool GetProperty_(jsval obj, const char* name, JS::MutableHandleValue out);
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bool GetPropertyInt_(jsval obj, int name, JS::MutableHandleValue value);
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static bool IsExceptionPending(JSContext* cx);
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static JSClass* GetClass(JSObject* obj);
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static void* GetPrivate(JSObject* obj);
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class CustomType
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{
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public:
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JSObject* m_Prototype;
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JSClass* m_Class;
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JSNative m_Constructor;
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};
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void Register(const char* name, JSNative fptr, size_t nargs);
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std::auto_ptr<ScriptInterface_impl> m;
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boost::rand48* m_rng;
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std::map<std::string, CustomType> m_CustomObjectTypes;
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// The nasty macro/template bits are split into a separate file so you don't have to look at them
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public:
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#include "NativeWrapperDecls.h"
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// This declares:
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//
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// template <R, T0..., TR (*fptr) (void* cbdata, T0...)>
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// void RegisterFunction(const char* functionName);
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//
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// template <R, T0..., TR (*fptr) (void* cbdata, T0...)>
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// static JSNative call;
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//
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// template <R, T0..., JSClass*, TC, TR (TC:*fptr) (T0...)>
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// static JSNative callMethod;
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//
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// template <dummy, T0...>
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// static size_t nargs();
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};
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// Implement those declared functions
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#include "NativeWrapperDefns.h"
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template<typename T>
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inline void ScriptInterface::AssignOrToJSVal(JS::MutableHandleValue handle, const T& a)
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{
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ToJSVal(GetContext(), handle, a);
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}
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template<>
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inline void ScriptInterface::AssignOrToJSVal<JS::RootedValue>(JS::MutableHandleValue handle, const JS::RootedValue& a)
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{
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handle.set(a);
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}
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template <>
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inline void ScriptInterface::AssignOrToJSVal<JS::HandleValue>(JS::MutableHandleValue handle, const JS::HandleValue& a)
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{
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handle.set(a);
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}
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template <>
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inline void ScriptInterface::AssignOrToJSVal<JS::Value>(JS::MutableHandleValue handle, const JS::Value& a)
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{
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handle.set(a);
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}
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template<typename T0>
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bool ScriptInterface::CallFunctionVoid(jsval val, const char* name, const T0& a0)
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{
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JSContext* cx = GetContext();
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JSAutoRequest rq(cx);
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JS::RootedValue jsRet(cx);
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JS::RootedValue val1(cx, val);
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JS::AutoValueVector argv(cx);
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argv.resize(1);
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AssignOrToJSVal(argv.handleAt(0), a0);
|
|
return CallFunction_(val1, name, 1, argv.begin(), &jsRet);
|
|
}
|
|
|
|
template<typename T0, typename T1>
|
|
bool ScriptInterface::CallFunctionVoid(jsval val, const char* name, const T0& a0, const T1& a1)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue jsRet(cx);
|
|
JS::RootedValue val1(cx, val);
|
|
JS::AutoValueVector argv(cx);
|
|
argv.resize(2);
|
|
AssignOrToJSVal(argv.handleAt(0), a0);
|
|
AssignOrToJSVal(argv.handleAt(1), a1);
|
|
return CallFunction_(val1, name, 2, argv.begin(), &jsRet);
|
|
}
|
|
|
|
template<typename T0, typename T1, typename T2>
|
|
bool ScriptInterface::CallFunctionVoid(jsval val, const char* name, const T0& a0, const T1& a1, const T2& a2)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue jsRet(cx);
|
|
JS::RootedValue val1(cx, val);
|
|
JS::AutoValueVector argv(cx);
|
|
argv.resize(3);
|
|
AssignOrToJSVal(argv.handleAt(0), a0);
|
|
AssignOrToJSVal(argv.handleAt(1), a1);
|
|
AssignOrToJSVal(argv.handleAt(2), a2);
|
|
return CallFunction_(val1, name, 3, argv.begin(), &jsRet);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetGlobal(const char* name, const T& value, bool replace)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
ToJSVal(GetContext(), &val, value);
|
|
return SetGlobal_(name, val, replace);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(jsval obj, const char* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(&val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(jsval obj, const wchar_t* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(&val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetPropertyInt(jsval obj, int name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(&val, value);
|
|
return SetPropertyInt_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetProperty(jsval obj, const char* name, T& out)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue val(cx);
|
|
if (! GetProperty_(obj, name, &val))
|
|
return false;
|
|
return FromJSVal(cx, val, out);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetProperty(jsval obj, const char* name, JS::Rooted<T>* out)
|
|
{
|
|
JS::MutableHandle<T> handleOut(out);
|
|
if (! GetProperty_(obj, name, handleOut))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetProperty(jsval obj, const char* name, JS::MutableHandle<T> out)
|
|
{
|
|
if (! GetProperty_(obj, name, out))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetPropertyInt(jsval obj, int name, T& out)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
if (! GetPropertyInt_(obj, name, &val))
|
|
return false;
|
|
return FromJSVal(GetContext(), val, out);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetPropertyInt(jsval obj, int name, JS::Rooted<T>* out)
|
|
{
|
|
JS::MutableHandle<T> handleOut(out);
|
|
if (! GetPropertyInt_(obj, name, handleOut))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetPropertyInt(jsval obj, int name, JS::MutableHandle<T> out)
|
|
{
|
|
if (! GetPropertyInt_(obj, name, out))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename CHAR>
|
|
bool ScriptInterface::Eval(const CHAR* code, JS::MutableHandleValue ret)
|
|
{
|
|
if (! Eval_(code, ret))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
template<typename T, typename CHAR>
|
|
bool ScriptInterface::Eval(const CHAR* code, T& ret)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue rval(GetContext());
|
|
if (! Eval_(code, &rval))
|
|
return false;
|
|
return FromJSVal(GetContext(), rval, ret);
|
|
}
|
|
|
|
#endif // INCLUDED_SCRIPTINTERFACE
|