/* * Copyright (C) 2017 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #include <wtf/PrintStream.h> namespace JSC { enum class ConstraintVolatility : uint8_t { // The constraint needs to be validated, but it is unlikely to ever produce information. // It's best to run it at the bitter end. SeldomGreyed, // FIXME: We could introduce a new kind of volatility called GreyedByResumption, which // would mean running all of the times that GreyedByExecution runs except as a root in a // full GC. // https://bugs.webkit.org/show_bug.cgi?id=166830 // The constraint needs to be reevaluated anytime the mutator runs: so at GC start and // whenever the GC resuspends after a resumption. This is almost always something that // you'd call a "root" in a traditional GC. GreyedByExecution, // The constraint needs to be reevaluated any time any object is marked and anytime the // mutator resumes. GreyedByMarking }; } // namespace JSC namespace WTF { inline void printInternal(PrintStream& out, JSC::ConstraintVolatility volatility) { switch (volatility) { case JSC::ConstraintVolatility::SeldomGreyed: out.print("SeldomGreyed"); return; case JSC::ConstraintVolatility::GreyedByExecution: out.print("GreyedByExecuction"); return; case JSC::ConstraintVolatility::GreyedByMarking: out.print("GreyedByMarking"); return; } RELEASE_ASSERT_NOT_REACHED(); } } // namespace WTF