/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
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 * The Original Code is the Mozilla SpiderMonkey JaegerMonkey implementation
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#include "jsautooplen.h"

namespace js {

class BytecodeRange {
  public:
    BytecodeRange(JSContext *cx, JSScript *script)
      : cx(cx), script(script), pc(script->code), end(pc + script->length) {}
    bool empty() const { return pc == end; }
    jsbytecode *frontPC() const { return pc; }
    JSOp frontOpcode() const { return js_GetOpcode(cx, script, pc); }
    size_t frontOffset() const { return pc - script->code; }
    void popFront() { pc += GetBytecodeLength(cx, script, pc); }

  private:
    JSContext *cx;
    JSScript *script;
    jsbytecode *pc, *end;
};

/* 
 * Warning: this does not skip JSOP_RESETBASE* or JSOP_INDEXBASE* ops, so it is
 * useful only when checking for optimization opportunities.
 */
JS_ALWAYS_INLINE jsbytecode *
AdvanceOverBlockchainOp(jsbytecode *pc)
{
    if (*pc == JSOP_NULLBLOCKCHAIN)
        return pc + JSOP_NULLBLOCKCHAIN_LENGTH;
    if (*pc == JSOP_BLOCKCHAIN)
        return pc + JSOP_BLOCKCHAIN_LENGTH;
    return pc;
}

}