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74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 the Mozilla SpiderMonkey JaegerMonkey implementation
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2002-2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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#include "jsautooplen.h"
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namespace js {
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class BytecodeRange {
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public:
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BytecodeRange(JSContext *cx, JSScript *script)
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: cx(cx), script(script), pc(script->code), end(pc + script->length) {}
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bool empty() const { return pc == end; }
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jsbytecode *frontPC() const { return pc; }
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JSOp frontOpcode() const { return js_GetOpcode(cx, script, pc); }
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size_t frontOffset() const { return pc - script->code; }
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void popFront() { pc += GetBytecodeLength(cx, script, pc); }
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private:
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JSContext *cx;
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JSScript *script;
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jsbytecode *pc, *end;
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};
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/*
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* Warning: this does not skip JSOP_RESETBASE* or JSOP_INDEXBASE* ops, so it is
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* useful only when checking for optimization opportunities.
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*/
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JS_ALWAYS_INLINE jsbytecode *
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AdvanceOverBlockchainOp(jsbytecode *pc)
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{
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if (*pc == JSOP_NULLBLOCKCHAIN)
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return pc + JSOP_NULLBLOCKCHAIN_LENGTH;
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if (*pc == JSOP_BLOCKCHAIN)
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return pc + JSOP_BLOCKCHAIN_LENGTH;
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return pc;
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}
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}
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