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src/preparse-data-format.h

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+// 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_PREPARSE_DATA_FORMAT_H_
+#define V8_PREPARSE_DATA_FORMAT_H_
+
+namespace v8 {
+namespace internal {
+
+// Generic and general data used by preparse data recorders and readers.
+
+struct PreparseDataConstants {
+ public:
+  // Layout and constants of the preparse data exchange format.
+  static const unsigned kMagicNumber = 0xBadDead;
+  static const unsigned kCurrentVersion = 6;
+
+  static const int kMagicOffset = 0;
+  static const int kVersionOffset = 1;
+  static const int kHasErrorOffset = 2;
+  static const int kFunctionsSizeOffset = 3;
+  static const int kSymbolCountOffset = 4;
+  static const int kSizeOffset = 5;
+  static const int kHeaderSize = 6;
+
+  // If encoding a message, the following positions are fixed.
+  static const int kMessageStartPos = 0;
+  static const int kMessageEndPos = 1;
+  static const int kMessageArgCountPos = 2;
+  static const int kMessageTextPos = 3;
+
+  static const unsigned char kNumberTerminator = 0x80u;
+};
+
+
+} }  // namespace v8::internal.
+
+#endif  // V8_PREPARSE_DATA_FORMAT_H_