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Unified Diff: src/number-info.h

Issue 545007: Introduce number type information in the virtual frame. (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: merged with latest rev. Created 10 years, 10 months ago
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Index: src/number-info.h
===================================================================
--- src/number-info.h (revision 0)
+++ src/number-info.h (revision 0)
@@ -0,0 +1,53 @@
+// Copyright 2010 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_NUMBER_INFO_H_
+#define V8_NUMBER_INFO_H_
+
+namespace v8 {
+namespace internal {
+
+class NumberInfo : public AllStatic {
+ public:
+ enum Type {
+ kUnknown = 0,
+ kNumber = 1,
+ kSmi = 3,
+ kHeapNumber = 5,
+ kUninitialized = 7
+ };
+
+ // Return the weakest (least precise) common type.
+ static Type Combine(Type a, Type b) {
+ // Make use of the order of enum values.
+ return static_cast<Type>(a & b);
+ }
+};
+
+} } // namespace v8::internal
+
+#endif // V8_NUMBER_INFO_H_
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