153 lines
5.4 KiB
JavaScript
153 lines
5.4 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 Liveness {
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constructor(thing, code)
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{
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this._thing = thing;
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this._code = code;
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this._liveAtHead = new Map();
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this._liveAtTail = new Map();
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for (let block of code) {
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this._liveAtHead.set(block, new Set());
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let liveAtTail = new Set();
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this._liveAtTail.set(block, liveAtTail);
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block.last.forEach(
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thing,
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(value, role, type, width) => {
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if (Arg.isLateUse(role))
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liveAtTail.add(value);
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});
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}
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let dirtyBlocks = new Set(code);
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let changed;
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do {
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changed = false;
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for (let blockIndex = code.size; blockIndex--;) {
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let block = code.at(blockIndex);
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if (!block)
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continue;
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if (!dirtyBlocks.delete(block))
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continue;
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let localCalc = this.localCalc(block);
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for (let instIndex = block.size; instIndex--;)
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localCalc.execute(instIndex);
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// Handle the early def's of the first instruction.
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block.at(0).forEach(
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thing,
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(value, role, type, width) => {
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if (Arg.isEarlyDef(role))
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localCalc.liveSet.remove(value);
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});
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let liveAtHead = this._liveAtHead.get(block);
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if (!mergeIntoSet(liveAtHead, localCalc.liveSet))
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continue;
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for (let predecessor of block.predecessors) {
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if (mergeIntoSet(this._liveAtTail.get(predecessor), liveAtHead)) {
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dirtyBlocks.add(predecessor);
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changed = true;
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}
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}
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}
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} while (changed);
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}
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get thing() { return this._thing; }
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get code() { return this._code; }
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get liveAtHead() { return this._liveAtHead; }
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get liveAtTail() { return this._liveAtTail; }
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localCalc(block)
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{
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let liveness = this;
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class LocalCalc {
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constructor()
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{
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this._liveSet = new Set(liveness.liveAtTail.get(block));
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}
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get liveSet() { return this._liveSet; }
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execute(instIndex)
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{
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let inst = block.at(instIndex);
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// First handle the early defs of the next instruction.
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if (instIndex + 1 < block.size) {
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block.at(instIndex + 1).forEach(
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liveness.thing,
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(value, role, type, width) => {
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if (Arg.isEarlyDef(role))
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this._liveSet.delete(value);
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});
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}
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// Then handle defs.
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inst.forEach(
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liveness.thing,
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(value, role, type, width) => {
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if (Arg.isLateDef(role))
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this._liveSet.delete(value);
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});
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// Then handle uses.
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inst.forEach(
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liveness.thing,
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(value, role, type, width) => {
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if (Arg.isEarlyUse(role))
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this._liveSet.add(value);
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});
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// Finally handle the late uses of the previous instruction.
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if (instIndex - 1 >= 0) {
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block.at(instIndex - 1).forEach(
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liveness.thing,
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(value, role, type, width) => {
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if (Arg.isLateUse(role))
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this._liveSet.add(value);
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});
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}
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}
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}
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return new LocalCalc();
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}
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}
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