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authorLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
commit32761a6cee1d0dee366b885b7b9c777e67885688 (patch)
treed6bec92bebfb216f4126356e55518842c2f476a1 /Source/JavaScriptCore/heap/CellState.h
parenta4e969f4965059196ca948db781e52f7cfebf19e (diff)
downloadWebKitGtk-tarball-32761a6cee1d0dee366b885b7b9c777e67885688.tar.gz
webkitgtk-2.4.11webkitgtk-2.4.11
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-/*
- * Copyright (C) 2015 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.
- */
-
-#ifndef CellState_h
-#define CellState_h
-
-namespace JSC {
-
-enum class CellState : uint8_t {
- // The object is black as far as this GC is concerned. When not in GC, this just means that it's an
- // old gen object. Note that we deliberately arrange OldBlack to be zero, so that the store barrier on
- // a target object "from" is just:
- //
- // if (!from->cellState())
- // slowPath(from);
- //
- // There is a bunch of code in the LLInt and JITs that rely on this being the case. You'd have to
- // change a lot of code if you ever wanted the store barrier to be anything but a non-zero check on
- // cellState.
- OldBlack = 0,
-
- // The object is in eden. During GC, this means that the object has not been marked yet.
- NewWhite = 1,
-
- // The object is grey - i.e. it will be scanned - but it either belongs to old gen (if this is eden
- // GC) or it is grey a second time in this current GC (because a concurrent store barrier requested
- // re-greying).
- OldGrey = 2,
-
- // The object is grey - i.e. it will be scanned - and this is the first time in this GC that we are
- // going to scan it. If this is an eden GC, this also means that the object is in eden.
- NewGrey = 3
-};
-
-} // namespace JSC
-
-#endif // CellState_h
-