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* Copyright (C) 2019 Apple Inc. All rights reserved.
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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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* 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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* 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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#include "NarrowingNumberPredictionFuzzerAgent.h"
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#include "CodeBlock.h"
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NarrowingNumberPredictionFuzzerAgent::NarrowingNumberPredictionFuzzerAgent(VM& vm)
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: NumberPredictionFuzzerAgent(vm)
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SpeculatedType NarrowingNumberPredictionFuzzerAgent::getPrediction(CodeBlock* codeBlock, const CodeOrigin& codeOrigin, SpeculatedType original)
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auto locker = holdLock(m_lock);
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if (!(original && speculationChecked(original, SpecBytecodeNumber)))
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Vector<SpeculatedType> numberTypesThatCouldBePartOfSpeculation;
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for (auto numberType : bytecodeNumberTypes()) {
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if (numberType & original)
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numberTypesThatCouldBePartOfSpeculation.append(numberType);
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unsigned numberOfTypesToKeep = m_random.getUint32(numberTypesThatCouldBePartOfSpeculation.size()) + 1;
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if (numberOfTypesToKeep == numberTypesThatCouldBePartOfSpeculation.size())
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SpeculatedType generated = SpecNone;
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for (unsigned i = 0; i < numberOfTypesToKeep; i++) {
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unsigned indexOfTypeToKeep = m_random.getUint32(numberTypesThatCouldBePartOfSpeculation.size());
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mergeSpeculation(generated, numberTypesThatCouldBePartOfSpeculation[indexOfTypeToKeep]);
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numberTypesThatCouldBePartOfSpeculation.remove(indexOfTypeToKeep);
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if (Options::dumpFuzzerAgentPredictions())
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dataLogLn("NarrowingNumberPredictionFuzzerAgent::getPrediction name:(", codeBlock->inferredName(), "#", codeBlock->hashAsStringIfPossible(), "),bytecodeIndex:(", codeOrigin.bytecodeIndex(), "),original:(", SpeculationDump(original), "),generated:(", SpeculationDump(generated), ")");