webkitgtk-2.10.2webkitgtk-2.10.2

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diff --git a/Source/JavaScriptCore/bytecode/ExpressionRangeInfo.h b/Source/JavaScriptCore/bytecode/ExpressionRangeInfo.h
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+++ b/Source/JavaScriptCore/bytecode/ExpressionRangeInfo.h
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+/*
+ * Copyright (C) 2012, 2013 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. 
+ */
+
+#ifndef ExpressionRangeInfo_h
+#define ExpressionRangeInfo_h
+
+#include <wtf/StdLibExtras.h>
+
+namespace JSC {
+
+struct ExpressionRangeInfo {
+    // Line and column values are encoded in 1 of 3 modes depending on the size
+    // of their values. These modes are:
+    //
+    //   1. FatLine: 22-bit line, 8-bit column.
+    //   2. FatColumn: 8-bit line, 22-bit column.
+    //   3. FatLineAndColumn: 32-bit line, 32-bit column.
+    //
+    // For the first 2 modes, the line and column will be encoded in the 30-bit
+    // position field in the ExpressionRangeInfo. For the FatLineAndColumn mode,
+    // the position field will hold an index into a FatPosition vector which
+    // holds the FatPosition records with the full 32-bit line and column values.
+
+    enum {
+        FatLineMode,
+        FatColumnMode,
+        FatLineAndColumnMode
+    };
+
+    struct FatPosition {
+        uint32_t line;
+        uint32_t column;
+    };
+
+    enum {
+        FatLineModeLineShift = 8,
+        FatLineModeLineMask = (1 << 22) - 1,
+        FatLineModeColumnMask = (1 << 8) - 1,
+        FatColumnModeLineShift = 22,
+        FatColumnModeLineMask = (1 << 8) - 1,
+        FatColumnModeColumnMask = (1 << 22) - 1
+    };
+
+    enum {
+        MaxOffset = (1 << 7) - 1, 
+        MaxDivot = (1 << 25) - 1,
+        MaxFatLineModeLine = (1 << 22) - 1,
+        MaxFatLineModeColumn = (1 << 8) - 1,
+        MaxFatColumnModeLine = (1 << 8) - 1,
+        MaxFatColumnModeColumn = (1 << 22) - 1
+    };
+
+    void encodeFatLineMode(unsigned line, unsigned column)
+    {
+        ASSERT(line <= MaxFatLineModeLine);
+        ASSERT(column <= MaxFatLineModeColumn);
+        position = ((line & FatLineModeLineMask) << FatLineModeLineShift | (column & FatLineModeColumnMask));
+    }
+
+    void encodeFatColumnMode(unsigned line, unsigned column)
+    {
+        ASSERT(line <= MaxFatColumnModeLine);
+        ASSERT(column <= MaxFatColumnModeColumn);
+        position = ((line & FatColumnModeLineMask) << FatColumnModeLineShift | (column & FatColumnModeColumnMask));
+    }
+
+    void decodeFatLineMode(unsigned& line, unsigned& column)
+    {
+        line = (position >> FatLineModeLineShift) & FatLineModeLineMask;
+        column = position & FatLineModeColumnMask;
+    }
+
+    void decodeFatColumnMode(unsigned& line, unsigned& column)
+    {
+        line = (position >> FatColumnModeLineShift) & FatColumnModeLineMask;
+        column = position & FatColumnModeColumnMask;
+    }
+
+    uint32_t instructionOffset : 25;
+    uint32_t startOffset : 7;
+    uint32_t divotPoint : 25;
+    uint32_t endOffset : 7;
+    uint32_t mode : 2;
+    uint32_t position : 30;
+};
+
+} // namespace JSC
+
+#endif // ExpressionRangeInfo_h
+