Source/JavaScriptCore/jit/CallFrameShuffleData.h

/*
 * Copyright (C) 2015-2019 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#pragma once

#if ENABLE(JIT)

#include "RegisterMap.h"
#include "ValueRecovery.h"

namespace JSC {

struct OpTailCall;

struct CallFrameShuffleData {
    WTF_MAKE_FAST_ALLOCATED;
public:
    void shrinkToFit()
    {
        args.shrinkToFit();
    }

    static CallFrameShuffleData createForBaselineOrLLIntTailCall(const OpTailCall&, unsigned numParameters);

    Vector<ValueRecovery> args;
    unsigned numLocals { UINT_MAX };
    unsigned numPassedArgs { UINT_MAX };
    unsigned numParameters { UINT_MAX }; // On our machine frame.
    RegisterMap<ValueRecovery> registers;
#if USE(JSVALUE64)
    GPRReg numberTagRegister { InvalidGPRReg };
#endif

    void setupCalleeSaveRegisters(const RegisterAtOffsetList*);
    ValueRecovery callee;
};

} // namespace JSC

#endif // ENABLE(JIT)