Yves
1a66f510d0
Using references matches the C++ coding style better and should improve performance a bit in theory. It avoids 2 copies of T in case of the functions registered with RegisterFunction (mainy used in the GUI). It should also avoid one or two copies in case of DEFINE_INTERFACE_METHOD_X, which is used in the simulation, but I haven't bothered to count it there exactly. It is now predefined which types have to be passed by const reference and which are passed by value. Note that references can't be used as out-parameters (to return multiple values to JS). This hasn't worked before either and probably never will. This was SVN commit r17696.
618 lines
21 KiB
C++
618 lines
21 KiB
C++
/* Copyright (C) 2016 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 <boost/random/linear_congruential.hpp>
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#include "lib/file/vfs/vfs_path.h"
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#include "maths/Fixed.h"
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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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#include "ps/Profile.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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// 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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#define DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER 2 * 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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/**
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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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NONCOPYABLE(ScriptInterface);
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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(shared_ptr<ScriptRuntime> parentRuntime = shared_ptr<ScriptRuntime>(), int runtimeSize = DEFAULT_RUNTIME_SIZE,
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int heapGrowthBytesGCTrigger = DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER);
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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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JS::Value 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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* @param ctor An object that can be used as constructor
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* @param argv Constructor arguments
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* @param out The new object; On error an error message gets logged and out is Null (out.isNull() == true).
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*/
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void CallConstructor(JS::HandleValue ctor, JS::HandleValueArray argv, JS::MutableHandleValue out);
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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(JS::HandleValue 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(JS::HandleValue 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(JS::HandleValue 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(JS::HandleValue val, const char* name, const T0& a0, const T1& a1, const T2& a2);
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JSObject* CreateCustomObject(const std::string & typeName) const;
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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(JS::HandleValue 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(JS::HandleValue 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(JS::HandleValue 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(JS::HandleValue 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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*/
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bool GetProperty(JS::HandleValue obj, const char* name, JS::MutableHandleValue out);
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bool GetProperty(JS::HandleValue obj, const char* name, JS::MutableHandleObject 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(JS::HandleValue obj, int name, T& out);
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/**
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* Get the named property of the given object.
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*/
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bool GetPropertyInt(JS::HandleValue obj, int name, JS::MutableHandleValue 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(JS::HandleValue 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(JS::HandleValue objVal, 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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/**
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* Convert an object to a UTF-8 encoded string, either with JSON
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* (if pretty == true and there is no JSON error) or with toSource().
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*
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* We have to use a mutable handle because JS_Stringify requires that for unknown reasons.
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*/
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std::string ToString(JS::MutableHandleValue obj, bool pretty = false);
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/**
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* Parse a UTF-8-encoded JSON string. Returns the unmodified value on error
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* and prints an error message.
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* @return true on success; false otherwise
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*/
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bool ParseJSON(const std::string& string_utf8, JS::MutableHandleValue out);
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/**
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* Read a JSON file. Returns the unmodified value on error and prints an error message.
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*/
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void ReadJSONFile(const VfsPath& path, JS::MutableHandleValue out);
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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(JS::MutableHandleValue 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 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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JS::Value CloneValueFromOtherContext(ScriptInterface& otherContext, JS::HandleValue 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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/**
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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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* 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(JS::HandleValue v);
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void ReadStructuredClone(const shared_ptr<StructuredClone>& ptr, JS::MutableHandleValue ret);
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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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static void AssignOrToJSVal(JSContext* cx, JS::MutableHandleValue handle, const T& a);
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/**
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* The same as AssignOrToJSVal, but also allows JS::Value for T.
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* In most cases it's not safe to use the plain (unrooted) JS::Value type, but this can happen quite
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* easily with template functions. The idea is that the linker prints an error if AssignOrToJSVal is
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* used with JS::Value. If the specialization for JS::Value should be allowed, you can use this
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* "unrooted" version of AssignOrToJSVal.
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*/
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template <typename T>
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static void AssignOrToJSValUnrooted(JSContext* cx, JS::MutableHandleValue handle, const T& a)
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{
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AssignOrToJSVal(cx, handle, a);
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}
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/**
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* Converts |val| to T if needed or just returns it if it's a handle.
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* This is meant for use in other templates where we want to use the same code for JS::HandleValue and
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* other types.
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*/
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template <typename T>
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static T AssignOrFromJSVal(JSContext* cx, const JS::HandleValue& val, bool& ret);
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private:
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bool CallFunction_(JS::HandleValue val, const char* name, JS::HandleValueArray 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, JS::HandleValue value, bool replace);
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bool SetProperty_(JS::HandleValue obj, const char* name, JS::HandleValue value, bool readonly, bool enumerate);
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bool SetProperty_(JS::HandleValue obj, const wchar_t* name, JS::HandleValue value, bool readonly, bool enumerate);
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bool SetPropertyInt_(JS::HandleValue obj, int name, JS::HandleValue value, bool readonly, bool enumerate);
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bool GetProperty_(JS::HandleValue obj, const char* name, JS::MutableHandleValue out);
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bool GetPropertyInt_(JS::HandleValue obj, int name, JS::MutableHandleValue value);
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static bool IsExceptionPending(JSContext* cx);
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static const JSClass* GetClass(JS::HandleObject obj);
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static void* GetPrivate(JS::HandleObject obj);
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struct CustomType
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{
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// TODO: Move assignment operator and move constructor only have to be
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// explicitly defined for Visual Studio. VS2013 is still behind on C++11 support
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// What's missing is what they call "Rvalue references v3.0", see
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// https://msdn.microsoft.com/en-us/library/hh567368.aspx#rvref
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CustomType() {}
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CustomType& operator=(CustomType&& other)
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{
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m_Prototype = std::move(other.m_Prototype);
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m_Class = std::move(other.m_Class);
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m_Constructor = std::move(other.m_Constructor);
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return *this;
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}
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CustomType(CustomType&& other)
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{
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m_Prototype = std::move(other.m_Prototype);
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m_Class = std::move(other.m_Class);
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m_Constructor = std::move(other.m_Constructor);
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}
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DefPersistentRooted<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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// Take care to keep this declaration before heap rooted members. Destructors of heap rooted
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// members have to be called before the runtime destructor.
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std::unique_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(JSContext* cx, JS::MutableHandleValue handle, const T& a)
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{
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ToJSVal(cx, handle, a);
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}
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template<>
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inline void ScriptInterface::AssignOrToJSVal<JS::PersistentRootedValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::PersistentRootedValue& 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::RootedValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::RootedValue& a)
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{
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handle.set(a);
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}
|
|
|
|
template <>
|
|
inline void ScriptInterface::AssignOrToJSVal<JS::HandleValue>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::HandleValue& a)
|
|
{
|
|
handle.set(a);
|
|
}
|
|
|
|
template <>
|
|
inline void ScriptInterface::AssignOrToJSValUnrooted<JS::Value>(JSContext* UNUSED(cx), JS::MutableHandleValue handle, const JS::Value& a)
|
|
{
|
|
handle.set(a);
|
|
}
|
|
|
|
template<typename T>
|
|
inline T ScriptInterface::AssignOrFromJSVal(JSContext* cx, const JS::HandleValue& val, bool& ret)
|
|
{
|
|
T retVal;
|
|
ret = FromJSVal(cx, val, retVal);
|
|
return retVal;
|
|
}
|
|
|
|
template<>
|
|
inline JS::HandleValue ScriptInterface::AssignOrFromJSVal<JS::HandleValue>(JSContext* UNUSED(cx), const JS::HandleValue& val, bool& ret)
|
|
{
|
|
ret = true;
|
|
return val;
|
|
}
|
|
|
|
template<typename T0>
|
|
bool ScriptInterface::CallFunctionVoid(JS::HandleValue val, const char* name, const T0& a0)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue jsRet(cx);
|
|
JS::AutoValueVector argv(cx);
|
|
argv.resize(1);
|
|
AssignOrToJSVal(cx, argv.handleAt(0), a0);
|
|
return CallFunction_(val, name, argv, &jsRet);
|
|
}
|
|
|
|
template<typename T0, typename T1>
|
|
bool ScriptInterface::CallFunctionVoid(JS::HandleValue val, const char* name, const T0& a0, const T1& a1)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue jsRet(cx);
|
|
JS::AutoValueVector argv(cx);
|
|
argv.resize(2);
|
|
AssignOrToJSVal(cx, argv.handleAt(0), a0);
|
|
AssignOrToJSVal(cx, argv.handleAt(1), a1);
|
|
return CallFunction_(val, name, argv, &jsRet);
|
|
}
|
|
|
|
template<typename T0, typename T1, typename T2>
|
|
bool ScriptInterface::CallFunctionVoid(JS::HandleValue val, const char* name, const T0& a0, const T1& a1, const T2& a2)
|
|
{
|
|
JSContext* cx = GetContext();
|
|
JSAutoRequest rq(cx);
|
|
JS::RootedValue jsRet(cx);
|
|
JS::AutoValueVector argv(cx);
|
|
argv.resize(3);
|
|
AssignOrToJSVal(cx, argv.handleAt(0), a0);
|
|
AssignOrToJSVal(cx, argv.handleAt(1), a1);
|
|
AssignOrToJSVal(cx, argv.handleAt(2), a2);
|
|
return CallFunction_(val, name, argv, &jsRet);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetGlobal(const char* name, const T& value, bool replace)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetGlobal_(name, val, replace);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(JS::HandleValue obj, const char* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetProperty(JS::HandleValue obj, const wchar_t* name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetProperty_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::SetPropertyInt(JS::HandleValue obj, int name, const T& value, bool readonly, bool enumerate)
|
|
{
|
|
JSAutoRequest rq(GetContext());
|
|
JS::RootedValue val(GetContext());
|
|
AssignOrToJSVal(GetContext(), &val, value);
|
|
return SetPropertyInt_(obj, name, val, readonly, enumerate);
|
|
}
|
|
|
|
template<typename T>
|
|
bool ScriptInterface::GetProperty(JS::HandleValue 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::GetPropertyInt(JS::HandleValue 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 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
|