mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/*
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* Copyright (C) 2012-2013, 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/StdLibExtras.h>
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namespace JSC {
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struct ExpressionRangeInfo {
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// Line and column values are encoded in 1 of 3 modes depending on the size
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// of their values. These modes are:
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//
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// 1. FatLine: 22-bit line, 8-bit column.
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// 2. FatColumn: 8-bit line, 22-bit column.
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// 3. FatLineAndColumn: 32-bit line, 32-bit column.
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//
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// For the first 2 modes, the line and column will be encoded in the 30-bit
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// position field in the ExpressionRangeInfo. For the FatLineAndColumn mode,
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// the position field will hold an index into a FatPosition vector which
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// holds the FatPosition records with the full 32-bit line and column values.
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enum {
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FatLineMode,
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FatColumnMode,
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FatLineAndColumnMode
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};
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struct FatPosition {
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uint32_t line;
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uint32_t column;
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};
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enum {
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FatLineModeLineShift = 8,
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FatLineModeLineMask = (1 << 22) - 1,
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FatLineModeColumnMask = (1 << 8) - 1,
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FatColumnModeLineShift = 22,
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FatColumnModeLineMask = (1 << 8) - 1,
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FatColumnModeColumnMask = (1 << 22) - 1
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};
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enum {
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MaxOffset = (1 << 7) - 1,
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MaxDivot = (1 << 25) - 1,
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MaxFatLineModeLine = (1 << 22) - 1,
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MaxFatLineModeColumn = (1 << 8) - 1,
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MaxFatColumnModeLine = (1 << 8) - 1,
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MaxFatColumnModeColumn = (1 << 22) - 1
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};
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void encodeFatLineMode(unsigned line, unsigned column)
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{
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ASSERT(line <= MaxFatLineModeLine);
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ASSERT(column <= MaxFatLineModeColumn);
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position = ((line & FatLineModeLineMask) << FatLineModeLineShift | (column & FatLineModeColumnMask));
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}
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void encodeFatColumnMode(unsigned line, unsigned column)
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{
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ASSERT(line <= MaxFatColumnModeLine);
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ASSERT(column <= MaxFatColumnModeColumn);
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position = ((line & FatColumnModeLineMask) << FatColumnModeLineShift | (column & FatColumnModeColumnMask));
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}
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void decodeFatLineMode(unsigned& line, unsigned& column) const
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{
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line = (position >> FatLineModeLineShift) & FatLineModeLineMask;
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column = position & FatLineModeColumnMask;
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}
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void decodeFatColumnMode(unsigned& line, unsigned& column) const
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{
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line = (position >> FatColumnModeLineShift) & FatColumnModeLineMask;
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column = position & FatColumnModeColumnMask;
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}
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uint32_t instructionOffset : 25;
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uint32_t startOffset : 7;
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uint32_t divotPoint : 25;
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uint32_t endOffset : 7;
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uint32_t mode : 2;
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uint32_t position : 30;
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};
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} // namespace JSC
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