mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
90 lines
3.3 KiB
C++
90 lines
3.3 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. ``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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#include "config.h"
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#include "JSMarkingConstraintPrivate.h"
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#include "APICast.h"
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#include "SimpleMarkingConstraint.h"
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using namespace JSC;
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namespace {
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Atomic<unsigned> constraintCounter;
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struct Marker : JSMarker {
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SlotVisitor* visitor;
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};
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bool isMarked(JSMarkerRef markerRef, JSObjectRef objectRef)
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{
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if (!objectRef)
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return true; // Null is an immortal object.
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return static_cast<Marker*>(markerRef)->visitor->vm().heap.isMarked(toJS(objectRef));
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}
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void mark(JSMarkerRef markerRef, JSObjectRef objectRef)
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{
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if (!objectRef)
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return;
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static_cast<Marker*>(markerRef)->visitor->appendHiddenUnbarriered(toJS(objectRef));
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}
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} // anonymous namespace
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void JSContextGroupAddMarkingConstraint(JSContextGroupRef group, JSMarkingConstraint constraintCallback, void *userData)
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{
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VM& vm = *toJS(group);
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JSLockHolder locker(vm);
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unsigned constraintIndex = constraintCounter.exchangeAdd(1);
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// This is a guess. The algorithm should be correct no matter what we pick. This means
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// that we expect this constraint to mark things even during a stop-the-world full GC, but
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// we don't expect it to be able to mark anything at the very start of a GC before anything
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// else gets marked.
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ConstraintVolatility volatility = ConstraintVolatility::GreyedByMarking;
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auto constraint = makeUnique<SimpleMarkingConstraint>(
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toCString("Amc", constraintIndex, "(", RawPointer(bitwise_cast<void*>(constraintCallback)), ")"),
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toCString("API Marking Constraint #", constraintIndex, " (", RawPointer(bitwise_cast<void*>(constraintCallback)), ", ", RawPointer(userData), ")"),
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[constraintCallback, userData]
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(SlotVisitor& slotVisitor) {
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Marker marker;
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marker.IsMarked = isMarked;
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marker.Mark = mark;
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marker.visitor = &slotVisitor;
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constraintCallback(&marker, userData);
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},
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volatility,
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ConstraintConcurrency::Sequential);
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vm.heap.addMarkingConstraint(WTFMove(constraint));
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}
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