68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
//===- FuzzerBuiltinsMSVC.h - Internal header for builtins ------*- C++ -* ===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Wrapper functions and marcos that use intrinsics instead of builtin functions
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// which cannot be compiled by MSVC.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_BUILTINS_MSVC_H
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#define LLVM_FUZZER_BUILTINS_MSVC_H
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#include "FuzzerPlatform.h"
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#if LIBFUZZER_MSVC
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#include <intrin.h>
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#include <cstdint>
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#include <cstdlib>
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// __builtin_return_address() cannot be compiled with MSVC. Use the equivalent
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// from <intrin.h>
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#define GET_CALLER_PC() _ReturnAddress()
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namespace fuzzer {
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inline uint8_t Bswap(uint8_t x) { return x; }
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// Use alternatives to __builtin functions from <stdlib.h> and <intrin.h> on
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// Windows since the builtins are not supported by MSVC.
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inline uint16_t Bswap(uint16_t x) { return _byteswap_ushort(x); }
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inline uint32_t Bswap(uint32_t x) { return _byteswap_ulong(x); }
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inline uint64_t Bswap(uint64_t x) { return _byteswap_uint64(x); }
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// The functions below were mostly copied from
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// compiler-rt/lib/builtins/int_lib.h which defines the __builtin functions used
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// outside of Windows.
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inline uint32_t Clzll(uint64_t X) {
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unsigned long LeadZeroIdx = 0;
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#if !defined(_M_ARM) && !defined(_M_X64)
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// Scan the high 32 bits.
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if (_BitScanReverse(&LeadZeroIdx, static_cast<unsigned long>(X >> 32)))
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return static_cast<int>(
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63 - (LeadZeroIdx + 32)); // Create a bit offset from the MSB.
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// Scan the low 32 bits.
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if (_BitScanReverse(&LeadZeroIdx, static_cast<unsigned long>(X)))
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return static_cast<int>(63 - LeadZeroIdx);
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#else
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if (_BitScanReverse64(&LeadZeroIdx, X)) return 63 - LeadZeroIdx;
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#endif
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return 64;
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}
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inline int Popcountll(unsigned long long X) {
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#if !defined(_M_ARM) && !defined(_M_X64)
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return __popcnt(X) + __popcnt(X >> 32);
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#else
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return __popcnt64(X);
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#endif
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}
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} // namespace fuzzer
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#endif // LIBFUZER_MSVC
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#endif // LLVM_FUZZER_BUILTINS_MSVC_H
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