mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-23 12:10:06 +00:00
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
// Copyright (c) 2015 The Khronos Group Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and/or associated documentation files (the
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// "Materials"), to deal in the Materials without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Materials, and to
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// permit persons to whom the Materials are furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Materials.
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//
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// MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
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// KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
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// SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
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// https://www.khronos.org/registry/
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//
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// THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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#include "endian.h"
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#include <cstring>
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enum {
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I32_ENDIAN_LITTLE = 0x03020100ul,
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I32_ENDIAN_BIG = 0x00010203ul,
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};
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// TODO(dneto): This relies on undefined behaviour. Fix that.
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static const union {
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unsigned char bytes[4];
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uint32_t value;
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} o32_host_order = {{0, 1, 2, 3}};
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#define I32_ENDIAN_HOST (o32_host_order.value)
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uint32_t spvFixWord(const uint32_t word, const spv_endianness_t endian) {
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if ((SPV_ENDIANNESS_LITTLE == endian && I32_ENDIAN_HOST == I32_ENDIAN_BIG) ||
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(SPV_ENDIANNESS_BIG == endian && I32_ENDIAN_HOST == I32_ENDIAN_LITTLE)) {
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return (word & 0x000000ff) << 24 | (word & 0x0000ff00) << 8 |
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(word & 0x00ff0000) >> 8 | (word & 0xff000000) >> 24;
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}
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return word;
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}
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uint64_t spvFixDoubleWord(const uint32_t low, const uint32_t high,
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const spv_endianness_t endian) {
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return (uint64_t(spvFixWord(high, endian)) << 32) | spvFixWord(low, endian);
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}
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spv_result_t spvBinaryEndianness(const spv_binary binary,
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spv_endianness_t *pEndian) {
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if (!binary->code || !binary->wordCount) return SPV_ERROR_INVALID_BINARY;
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if (!pEndian) return SPV_ERROR_INVALID_POINTER;
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uint8_t bytes[4];
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memcpy(bytes, binary->code, sizeof(uint32_t));
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if (0x03 == bytes[0] && 0x02 == bytes[1] && 0x23 == bytes[2] &&
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0x07 == bytes[3]) {
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*pEndian = SPV_ENDIANNESS_LITTLE;
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return SPV_SUCCESS;
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}
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if (0x07 == bytes[0] && 0x23 == bytes[1] && 0x02 == bytes[2] &&
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0x03 == bytes[3]) {
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*pEndian = SPV_ENDIANNESS_BIG;
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return SPV_SUCCESS;
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}
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return SPV_ERROR_INVALID_BINARY;
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}
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