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2 * Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
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26 #ifndef ExpressionRangeInfo_h
27 #define ExpressionRangeInfo_h
29 #include <wtf/StdLibExtras.h>
33 struct ExpressionRangeInfo
{
34 // Line and column values are encoded in 1 of 3 modes depending on the size
35 // of their values. These modes are:
37 // 1. FatLine: 22-bit line, 8-bit column.
38 // 2. FatColumn: 8-bit line, 22-bit column.
39 // 3. FatLineAndColumn: 32-bit line, 32-bit column.
41 // For the first 2 modes, the line and column will be encoded in the 30-bit
42 // position field in the ExpressionRangeInfo. For the FatLineAndColumn mode,
43 // the position field will hold an index into a FatPosition vector which
44 // holds the FatPosition records with the full 32-bit line and column values.
58 FatLineModeLineShift
= 8,
59 FatLineModeLineMask
= (1 << 22) - 1,
60 FatLineModeColumnMask
= (1 << 8) - 1,
61 FatColumnModeLineShift
= 22,
62 FatColumnModeLineMask
= (1 << 8) - 1,
63 FatColumnModeColumnMask
= (1 << 22) - 1
67 MaxOffset
= (1 << 7) - 1,
68 MaxDivot
= (1 << 25) - 1,
69 MaxFatLineModeLine
= (1 << 22) - 1,
70 MaxFatLineModeColumn
= (1 << 8) - 1,
71 MaxFatColumnModeLine
= (1 << 8) - 1,
72 MaxFatColumnModeColumn
= (1 << 22) - 1
75 void encodeFatLineMode(unsigned line
, unsigned column
)
77 ASSERT(line
<= MaxFatLineModeLine
);
78 ASSERT(column
<= MaxFatLineModeColumn
);
79 position
= ((line
& FatLineModeLineMask
) << FatLineModeLineShift
| (column
& FatLineModeColumnMask
));
82 void encodeFatColumnMode(unsigned line
, unsigned column
)
84 ASSERT(line
<= MaxFatColumnModeLine
);
85 ASSERT(column
<= MaxFatColumnModeColumn
);
86 position
= ((line
& FatColumnModeLineMask
) << FatColumnModeLineShift
| (column
& FatColumnModeColumnMask
));
89 void decodeFatLineMode(unsigned& line
, unsigned& column
)
91 line
= (position
>> FatLineModeLineShift
) & FatLineModeLineMask
;
92 column
= position
& FatLineModeColumnMask
;
95 void decodeFatColumnMode(unsigned& line
, unsigned& column
)
97 line
= (position
>> FatColumnModeLineShift
) & FatColumnModeLineMask
;
98 column
= position
& FatColumnModeColumnMask
;
101 uint32_t instructionOffset
: 25;
102 uint32_t startOffset
: 7;
103 uint32_t divotPoint
: 25;
104 uint32_t endOffset
: 7;
106 uint32_t position
: 30;
111 #endif // ExpressionRangeInfo_h