Imported WebKit commit a77350243e054f3460d1137301d8b3faee3d2052 (http://svn.webkit.org/repository/webkit/trunk@125365)

New snapshot with build fixes for latest API changes in Qt and all WK1 Win MSVC fixes upstream

1 files changed, 50 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGStructureCheckHoistingPhase.h b/Source/JavaScriptCore/dfg/DFGStructureCheckHoistingPhase.h
new file mode 100644
index 000000000..1e6462a92
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGStructureCheckHoistingPhase.h
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+/*
+ * Copyright (C) 2012 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. ``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
+ * 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 DFGStructureCheckHoistingPhase_h
+#define DFGStructureCheckHoistingPhase_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+namespace JSC { namespace DFG {
+
+class Graph;
+
+// Hoists CheckStructure on variables to assignments to those variables, if either of
+// the following is true:
+// A) The structure's transition watchpoint set is valid.
+// B) The span of code within which the variable is live has no effects that might
+//    clobber the structure.
+
+bool performStructureCheckHoisting(Graph&);
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGStructureCheckHoistingPhase_h
+