1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/gc/GCInternals.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,153 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef gc_GCInternals_h
1.11 +#define gc_GCInternals_h
1.12 +
1.13 +#include "jscntxt.h"
1.14 +#include "jsworkers.h"
1.15 +
1.16 +#include "gc/Zone.h"
1.17 +#include "vm/Runtime.h"
1.18 +
1.19 +namespace js {
1.20 +namespace gc {
1.21 +
1.22 +void
1.23 +MarkPersistentRootedChains(JSTracer *trc);
1.24 +
1.25 +void
1.26 +MarkRuntime(JSTracer *trc, bool useSavedRoots = false);
1.27 +
1.28 +void
1.29 +BufferGrayRoots(GCMarker *gcmarker);
1.30 +
1.31 +class AutoCopyFreeListToArenas
1.32 +{
1.33 + JSRuntime *runtime;
1.34 + ZoneSelector selector;
1.35 +
1.36 + public:
1.37 + AutoCopyFreeListToArenas(JSRuntime *rt, ZoneSelector selector);
1.38 + ~AutoCopyFreeListToArenas();
1.39 +};
1.40 +
1.41 +struct AutoFinishGC
1.42 +{
1.43 + AutoFinishGC(JSRuntime *rt);
1.44 +};
1.45 +
1.46 +/*
1.47 + * This class should be used by any code that needs to exclusive access to the
1.48 + * heap in order to trace through it...
1.49 + */
1.50 +class AutoTraceSession
1.51 +{
1.52 + public:
1.53 + AutoTraceSession(JSRuntime *rt, HeapState state = Tracing);
1.54 + ~AutoTraceSession();
1.55 +
1.56 + protected:
1.57 + AutoLockForExclusiveAccess lock;
1.58 + JSRuntime *runtime;
1.59 +
1.60 + private:
1.61 + AutoTraceSession(const AutoTraceSession&) MOZ_DELETE;
1.62 + void operator=(const AutoTraceSession&) MOZ_DELETE;
1.63 +
1.64 + HeapState prevState;
1.65 +};
1.66 +
1.67 +struct AutoPrepareForTracing
1.68 +{
1.69 + AutoFinishGC finish;
1.70 + AutoTraceSession session;
1.71 + AutoCopyFreeListToArenas copy;
1.72 +
1.73 + AutoPrepareForTracing(JSRuntime *rt, ZoneSelector selector);
1.74 +};
1.75 +
1.76 +class IncrementalSafety
1.77 +{
1.78 + const char *reason_;
1.79 +
1.80 + IncrementalSafety(const char *reason) : reason_(reason) {}
1.81 +
1.82 + public:
1.83 + static IncrementalSafety Safe() { return IncrementalSafety(nullptr); }
1.84 + static IncrementalSafety Unsafe(const char *reason) { return IncrementalSafety(reason); }
1.85 +
1.86 + typedef void (IncrementalSafety::* ConvertibleToBool)();
1.87 + void nonNull() {}
1.88 +
1.89 + operator ConvertibleToBool() const {
1.90 + return reason_ == nullptr ? &IncrementalSafety::nonNull : 0;
1.91 + }
1.92 +
1.93 + const char *reason() {
1.94 + JS_ASSERT(reason_);
1.95 + return reason_;
1.96 + }
1.97 +};
1.98 +
1.99 +IncrementalSafety
1.100 +IsIncrementalGCSafe(JSRuntime *rt);
1.101 +
1.102 +#ifdef JS_GC_ZEAL
1.103 +void
1.104 +StartVerifyPreBarriers(JSRuntime *rt);
1.105 +
1.106 +void
1.107 +EndVerifyPreBarriers(JSRuntime *rt);
1.108 +
1.109 +void
1.110 +StartVerifyPostBarriers(JSRuntime *rt);
1.111 +
1.112 +void
1.113 +EndVerifyPostBarriers(JSRuntime *rt);
1.114 +
1.115 +void
1.116 +FinishVerifier(JSRuntime *rt);
1.117 +
1.118 +class AutoStopVerifyingBarriers
1.119 +{
1.120 + JSRuntime *runtime;
1.121 + bool restartPreVerifier;
1.122 + bool restartPostVerifier;
1.123 + MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
1.124 +
1.125 + public:
1.126 + AutoStopVerifyingBarriers(JSRuntime *rt, bool isShutdown
1.127 + MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
1.128 + : runtime(rt)
1.129 + {
1.130 + restartPreVerifier = !isShutdown && rt->gcVerifyPreData;
1.131 + restartPostVerifier = !isShutdown && rt->gcVerifyPostData && JS::IsGenerationalGCEnabled(rt);
1.132 + if (rt->gcVerifyPreData)
1.133 + EndVerifyPreBarriers(rt);
1.134 + if (rt->gcVerifyPostData)
1.135 + EndVerifyPostBarriers(rt);
1.136 + MOZ_GUARD_OBJECT_NOTIFIER_INIT;
1.137 + }
1.138 +
1.139 + ~AutoStopVerifyingBarriers() {
1.140 + if (restartPreVerifier)
1.141 + StartVerifyPreBarriers(runtime);
1.142 + if (restartPostVerifier)
1.143 + StartVerifyPostBarriers(runtime);
1.144 + }
1.145 +};
1.146 +#else
1.147 +struct AutoStopVerifyingBarriers
1.148 +{
1.149 + AutoStopVerifyingBarriers(JSRuntime *, bool) {}
1.150 +};
1.151 +#endif /* JS_GC_ZEAL */
1.152 +
1.153 +} /* namespace gc */
1.154 +} /* namespace js */
1.155 +
1.156 +#endif /* gc_GCInternals_h */
