mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
/*
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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. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/PrintStream.h>
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namespace JSC {
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enum class ConstraintVolatility : uint8_t {
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// The constraint needs to be validated, but it is unlikely to ever produce information.
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// It's best to run it at the bitter end.
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SeldomGreyed,
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// FIXME: We could introduce a new kind of volatility called GreyedByResumption, which
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// would mean running all of the times that GreyedByExecution runs except as a root in a
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// full GC.
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// https://bugs.webkit.org/show_bug.cgi?id=166830
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// The constraint needs to be reevaluated anytime the mutator runs: so at GC start and
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// whenever the GC resuspends after a resumption. This is almost always something that
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// you'd call a "root" in a traditional GC.
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GreyedByExecution,
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// The constraint needs to be reevaluated any time any object is marked and anytime the
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// mutator resumes.
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GreyedByMarking
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};
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} // namespace JSC
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namespace WTF {
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inline void printInternal(PrintStream& out, JSC::ConstraintVolatility volatility)
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{
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switch (volatility) {
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case JSC::ConstraintVolatility::SeldomGreyed:
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out.print("SeldomGreyed");
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return;
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case JSC::ConstraintVolatility::GreyedByExecution:
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out.print("GreyedByExecuction");
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return;
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case JSC::ConstraintVolatility::GreyedByMarking:
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out.print("GreyedByMarking");
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return;
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}
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RELEASE_ASSERT_NOT_REACHED();
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}
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} // namespace WTF
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