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Unified Diff: src/hydrogen-mark-deoptimize.h

Issue 21065003: Turn mark deoptimize on undefined into a proper HPhase. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Addressed comments Created 7 years, 5 months ago
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Index: src/hydrogen-mark-deoptimize.h
diff --git a/src/hydrogen-mark-deoptimize.h b/src/hydrogen-mark-deoptimize.h
new file mode 100644
index 0000000000000000000000000000000000000000..0aa2c2c754069e4cf658429707a02ffe8fe4fa92
--- /dev/null
+++ b/src/hydrogen-mark-deoptimize.h
@@ -0,0 +1,63 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * 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.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER 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 V8_HYDROGEN_MARK_DEOPTIMIZE_H_
+#define V8_HYDROGEN_MARK_DEOPTIMIZE_H_
+
+#include "hydrogen.h"
+
+namespace v8 {
+namespace internal {
+
+
+// Compute DeoptimizeOnUndefined flag for phis. Any phi that can reach a use
+// with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set.
+// Currently only HCompareNumericAndBranch, with double input representation,
+// has this flag set. The flag is used by HChange tagged->double, which must
+// deoptimize if one of its uses has this flag set.
+class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
+ public:
+ explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph)
+ : HPhase("H_Mark deoptimize on undefined", graph),
+ worklist_(16, zone()) {}
+
+ void Run();
+
+ private:
+ void ProcessPhi(HPhi* phi);
+
+ // Preallocated worklist used as an optimization so we don't have
+ // to allocate a new ZoneList for every ProcessPhi() invocation.
+ ZoneList<HPhi*> worklist_;
+
+ DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase);
+};
+
+
+} } // namespace v8::internal
+
+#endif // V8_HYDROGEN_MARK_DEOPTIMIZE_H_
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