forked from 0ad/0ad
Yves
cfa59fc4e1
This is the new way for working with arguments in JSNative functions. JS_THIS_VALUE, JS_ARGV, JS_SET_RVAL and direct access to vp or argc are deprecated and will probably be removed in future versions of SpiderMonkey. CallArgs also takes care of proper rooting and you can get the values as Handles or MutableHandles. The interface changes a little bit for ESR 31, but commiting this now still makes it easier and the changes shout be straigtforward (search and replace more or less). Refs #2462 Refs #2415 This was SVN commit r15516.
139 lines
5.1 KiB
C++
139 lines
5.1 KiB
C++
/* Copyright (C) 2009 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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#include "ps/GameSetup/Config.h"
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// (NativeWrapperDecls.h set up a lot of the macros we use here)
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// ScriptInterface_NativeWrapper<T>::call(cx, rval, fptr, args...) will call fptr(cbdata, args...),
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// and if T != void then it will store the result in rval:
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// Templated on the return type so void can be handled separately
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template <typename R>
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struct ScriptInterface_NativeWrapper {
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#define OVERLOADS(z, i, data) \
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template<TYPENAME_T0_HEAD(z,i) typename F> \
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static void call(JSContext* cx, jsval& rval, F fptr T0_A0(z,i)) { \
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ScriptInterface::ToJSVal<R>(cx, rval, fptr(ScriptInterface::GetScriptInterfaceAndCBData(cx) A0_TAIL(z,i))); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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};
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// Overloaded to ignore the return value from void functions
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template <>
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struct ScriptInterface_NativeWrapper<void> {
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#define OVERLOADS(z, i, data) \
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template<TYPENAME_T0_HEAD(z,i) typename F> \
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static void call(JSContext* cx, jsval& /*rval*/, F fptr T0_A0(z,i)) { \
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fptr(ScriptInterface::GetScriptInterfaceAndCBData(cx) A0_TAIL(z,i)); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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};
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// Same idea but for method calls:
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template <typename R, typename TC>
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struct ScriptInterface_NativeMethodWrapper {
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#define OVERLOADS(z, i, data) \
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template<TYPENAME_T0_HEAD(z,i) typename F> \
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static void call(JSContext* cx, jsval& rval, TC* c, F fptr T0_A0(z,i)) { \
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ScriptInterface::ToJSVal<R>(cx, rval, (c->*fptr)( A0(z,i) )); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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};
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template <typename TC>
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struct ScriptInterface_NativeMethodWrapper<void, TC> {
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#define OVERLOADS(z, i, data) \
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template<TYPENAME_T0_HEAD(z,i) typename F> \
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static void call(JSContext* /*cx*/, jsval& /*rval*/, TC* c, F fptr T0_A0(z,i)) { \
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(c->*fptr)( A0(z,i) ); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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};
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// Fast natives don't trigger the hook we use for profiling, so explicitly
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// notify the profiler when these functions are being called.
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// ScriptInterface_impl::Register stores the name in a reserved slot.
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// (TODO: this doesn't work for functions registered via InterfaceScripted.h.
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// Maybe we should do some interned JS_GetFunctionId thing.)
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#define SCRIPT_PROFILE \
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if (g_ScriptProfilingEnabled) \
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{ \
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ENSURE(JS_CALLEE(cx, vp).isObject() && JS_ObjectIsFunction(cx, &JS_CALLEE(cx, vp).toObject())); \
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const char* name = "(unknown)"; \
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jsval nameval; \
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nameval = JS_GetReservedSlot( &JS_CALLEE(cx, vp).toObject(), 0); \
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if (!nameval.isUndefined()) \
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name = static_cast<const char*>(JSVAL_TO_PRIVATE(nameval)); \
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CProfileSampleScript profile(name); \
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}
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// JSFastNative-compatible function that wraps the function identified in the template argument list
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#define OVERLOADS(z, i, data) \
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template <typename R, TYPENAME_T0_HEAD(z,i) R (*fptr) ( ScriptInterface::CxPrivate* T0_TAIL(z,i) )> \
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JSBool ScriptInterface::call(JSContext* cx, uint argc, jsval* vp) { \
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JS::CallArgs args = JS::CallArgsFromVp(argc, vp); \
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SCRIPT_PROFILE \
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BOOST_PP_REPEAT_##z (i, CONVERT_ARG, ~) \
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jsval rval = JSVAL_VOID; \
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ScriptInterface_NativeWrapper<R>::call(cx, rval, fptr A0_TAIL(z,i)); \
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args.rval().set(rval); \
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return !ScriptInterface::IsExceptionPending(cx); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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// Same idea but for methods
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#define OVERLOADS(z, i, data) \
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template <typename R, TYPENAME_T0_HEAD(z,i) JSClass* CLS, typename TC, R (TC::*fptr) ( T0(z,i) )> \
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JSBool ScriptInterface::callMethod(JSContext* cx, uint argc, jsval* vp) { \
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JS::CallArgs args = JS::CallArgsFromVp(argc, vp); \
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SCRIPT_PROFILE \
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if (ScriptInterface::GetClass(JS_THIS_OBJECT(cx, vp)) != CLS) return false; \
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TC* c = static_cast<TC*>(ScriptInterface::GetPrivate(JS_THIS_OBJECT(cx, vp))); \
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if (! c) return false; \
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BOOST_PP_REPEAT_##z (i, CONVERT_ARG, ~) \
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jsval rval = JSVAL_VOID; \
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ScriptInterface_NativeMethodWrapper<R, TC>::call(cx, rval, c, fptr A0_TAIL(z,i)); \
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args.rval().set(rval); \
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return !ScriptInterface::IsExceptionPending(cx); \
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}
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BOOST_PP_REPEAT(SCRIPT_INTERFACE_MAX_ARGS, OVERLOADS, ~)
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#undef OVERLOADS
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// Clean up our mess
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#undef SCRIPT_PROFILE
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#undef NUMBERED_LIST_HEAD
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#undef NUMBERED_LIST_TAIL
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#undef NUMBERED_LIST_BALANCED
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#undef TYPED_ARGS
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#undef CONVERT_ARG
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#undef TYPENAME_T0_HEAD
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#undef TYPENAME_T0_TAIL
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#undef T0
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#undef T0_HEAD
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#undef T0_TAIL
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#undef T0_A0
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#undef A0
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#undef A0_TAIL
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