61 lines
2.3 KiB
JavaScript
61 lines
2.3 KiB
JavaScript
/*
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* Copyright (C) 2017 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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function programWithUnnecessaryThingsRemoved(program)
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{
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let nameFinder = new NameFinder();
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// Build our roots.
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for (let statement of program.topLevelStatements) {
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if (statement.origin.originKind === "user")
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nameFinder.add(statement.name);
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}
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// Unfortunately, we cannot know yet which operator casts we'll need.
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nameFinder.add("operator cast");
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// We need these even if the program doesn't mention them by name.
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nameFinder.add("void");
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nameFinder.add("bool");
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nameFinder.add("int");
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// Pull in things as necessary.
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while (nameFinder.worklist.length) {
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let name = nameFinder.worklist.pop();
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for (let thing of program.globalNameContext.underlyingThings(Anything, name))
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thing.visit(nameFinder);
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}
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let result = new Program();
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for (let name of nameFinder.set) {
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for (let thing of program.globalNameContext.underlyingThings(Anything, name))
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result.add(thing);
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}
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return result;
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}
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