103 lines
3.2 KiB
JavaScript
103 lines
3.2 KiB
JavaScript
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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"use strict";
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class StackSlot {
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constructor(index, byteSize, kind)
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{
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this._index = index;
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this._byteSize = byteSize;
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this._kind = kind;
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}
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get byteSize() { return this._byteSize; }
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get kind() { return this._kind; }
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get isLocked() { return this._kind == Locked; }
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get isSpill() { return this._kind == Spill; }
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get index() { return this._index; }
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ensureSize(size)
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{
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if (this._offsetFromFP)
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throw new Error("Stack slot already allocated");
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this._byteSize = Math.max(this._byteSize, size);
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}
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get alignment()
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{
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if (this._byteSize <= 1)
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return 1;
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if (this._byteSize <= 2)
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return 2;
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if (this._byteSize <= 4)
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return 4;
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return 8;
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}
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get offsetFromFP() { return this._offsetFromFP; }
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setOffsetFromFP(value) { this._offsetFromFP = value; }
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hash()
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{
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return ((this._kind == Spill ? 1 : 0) + this._byteSize * 3 + (this._offsetFromFP ? this._offsetFromFP * 7 : 0)) >>> 0;
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}
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toString()
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{
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return "" + (this.isSpill ? "spill" : "stack") + this._index + "<" + this._byteSize +
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(this._offsetFromFP ? ", offset = " + this._offsetFromFP : "") + ">";
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}
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static extract(arg)
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{
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if (arg.isStack)
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return arg.stackSlot;
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return null;
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}
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static forEachFast(arg, func)
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{
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if (!arg.isStack)
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return;
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let replacement;
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if (replacement = func(arg.stackSlot))
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return Arg.createStack(replacement, this._offset);
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}
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static forEach(arg, role, type, width, func)
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{
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if (!arg.isStack)
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return;
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let replacement;
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if (replacement = func(arg.stackSlot, role, type, width))
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return Arg.createStack(replacement, this._offset);
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}
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}
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