webkitgtk-2.12.3webkitgtk-2.12.3

1 files changed, 68 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/b3/B3BreakCriticalEdges.cpp b/Source/JavaScriptCore/b3/B3BreakCriticalEdges.cpp
new file mode 100644
index 000000000..60272d56d
--- /dev/null
+++ b/Source/JavaScriptCore/b3/B3BreakCriticalEdges.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2016 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 "B3BreakCriticalEdges.h"
+
+#if ENABLE(B3_JIT)
+
+#include "B3BasicBlockInlines.h"
+#include "B3BlockInsertionSet.h"
+#include "B3ControlValue.h"
+#include "B3ProcedureInlines.h"
+#include "B3ValueInlines.h"
+
+namespace JSC { namespace B3 {
+
+void breakCriticalEdges(Procedure& proc)
+{
+    BlockInsertionSet insertionSet(proc);
+    
+    for (BasicBlock* block : proc) {
+        if (block->numSuccessors() <= 1)
+            continue;
+
+        for (BasicBlock*& successor : block->successorBlocks()) {
+            if (successor->numPredecessors() <= 1)
+                continue;
+
+            BasicBlock* pad =
+                insertionSet.insertBefore(successor, successor->frequency());
+            pad->appendNew<ControlValue>(
+                proc, Jump, successor->at(0)->origin(), FrequentedBlock(successor));
+            pad->addPredecessor(block);
+            successor->replacePredecessor(block, pad);
+            successor = pad;
+        }
+    }
+
+    insertionSet.execute();
+    proc.invalidateCFG();
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)
+