1 files changed, 81 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGClobberize.cpp b/Source/JavaScriptCore/dfg/DFGClobberize.cpp
new file mode 100644
index 000000000..a693ba41b
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGClobberize.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013-2015 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. ``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. 
+ */
+
+#include "config.h"
+#include "DFGClobberize.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+bool doesWrites(Graph& graph, Node* node)
+{
+    NoOpClobberize noOp;
+    CheckClobberize addWrite;
+    clobberize(graph, node, noOp, addWrite, noOp);
+    return addWrite.result();
+}
+
+bool accessesOverlap(Graph& graph, Node* node, AbstractHeap heap)
+{
+    NoOpClobberize noOp;
+    AbstractHeapOverlaps addAccess(heap);
+    clobberize(graph, node, addAccess, addAccess, noOp);
+    return addAccess.result();
+}
+
+bool writesOverlap(Graph& graph, Node* node, AbstractHeap heap)
+{
+    NoOpClobberize noOp;
+    AbstractHeapOverlaps addWrite(heap);
+    clobberize(graph, node, noOp, addWrite, noOp);
+    return addWrite.result();
+}
+
+bool clobbersHeap(Graph& graph, Node* node)
+{
+    bool result = false;
+    clobberize(
+        graph, node, NoOpClobberize(),
+        [&] (AbstractHeap heap) {
+            switch (heap.kind()) {
+            case World:
+            case Heap:
+                result = true;
+                break;
+            default:
+                break;
+            }
+        },
+        NoOpClobberize());
+    return result;
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+