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c0342a0ab5
When header is included for the first time in translation unit, then preprocessor simply copy-pastes its content. If we define a constant in a header file and this constant has internal linkage then each and every translation unit, which includes this header will have its own copy of this constant. C++17 introduces inline variables, which are meant to allow creation of variables in header files, which do not cause multiple instances. The inline variable has a single instance when: - constexpr is used without static (constexpr implicitly implies inline) - inline is used without static - inline const is used without static (const does not imply internal linkage when used with inline) Signed-off-by: Patryk Wrobel <patryk.wrobel@intel.com>
37 lines
1014 B
C++
37 lines
1014 B
C++
/*
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* Copyright (C) 2020-2022 Intel Corporation
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#pragma once
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#include "shared/source/utilities/arrayref.h"
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#include "shared/source/utilities/const_stringref.h"
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#include <algorithm>
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#include <cstdint>
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namespace NEO {
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constexpr ConstStringRef llvmBcMagic = "BC\xc0\xde";
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constexpr ConstStringRef spirvMagic = "\x07\x23\x02\x03";
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constexpr ConstStringRef spirvMagicInv = "\x03\x02\x23\x07";
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inline bool hasSameMagic(ConstStringRef expectedMagic, ArrayRef<const uint8_t> binary) {
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auto binaryMagicLen = std::min(expectedMagic.size(), binary.size());
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ConstStringRef binaryMagic(reinterpret_cast<const char *>(binary.begin()), binaryMagicLen);
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return expectedMagic == binaryMagic;
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}
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inline bool isLlvmBitcode(ArrayRef<const uint8_t> binary) {
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return hasSameMagic(llvmBcMagic, binary);
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}
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inline bool isSpirVBitcode(ArrayRef<const uint8_t> binary) {
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return hasSameMagic(spirvMagic, binary) || hasSameMagic(spirvMagicInv, binary);
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}
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} // namespace NEO
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