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109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=99:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Jaegermonkey.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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*
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Andrew Drake <drakedevel@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Retroactive continuity ("retcon") refers to the retroactive modification
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* or reinterpretation of established facts.
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*/
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#if !defined jsjaeger_retcon_h__ && defined JS_METHODJIT
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#define jsjaeger_retcon_h__
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#include "jscntxt.h"
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#include "jsscript.h"
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#include "MethodJIT.h"
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#include "Compiler.h"
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namespace js {
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namespace mjit {
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/*
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* A problem often arises where, for one reason or another, a piece of code
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* wants to touch the script->code, but isn't expecting JSOP_TRAP. This allows
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* one to temporarily remove JSOP_TRAPs from the instruction stream (without
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* copying) and automatically re-add them on scope exit.
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*/
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class AutoScriptRetrapper
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{
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public:
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AutoScriptRetrapper(JSContext *cx1, JSScript *script1) :
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cx(cx1), script(script1), traps(cx) {};
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~AutoScriptRetrapper();
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bool untrap(jsbytecode *pc);
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private:
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JSContext *cx;
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JSScript *script;
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Vector<jsbytecode*> traps;
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};
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/*
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* This class is responsible for sanely re-JITing a script and fixing up
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* the world. If you ever change the code associated with a JSScript, or
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* otherwise would cause existing JITed code to be incorrect, you /must/ use
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* this to invalidate and potentially re-compile the existing JITed code,
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* fixing up the stack in the process.
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*/
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class Recompiler {
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struct PatchableAddress {
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void **location;
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CallSite callSite;
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};
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public:
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Recompiler(JSContext *cx, JSScript *script);
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bool recompile();
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private:
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JSContext *cx;
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JSScript *script;
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PatchableAddress findPatch(void **location);
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void applyPatch(Compiler& c, PatchableAddress& toPatch);
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};
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} /* namespace mjit */
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} /* namespace js */
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#endif
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