forked from OSchip/llvm-project
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
//===- FuzzerBuiltinsMSVC.h - Internal header for builtins ------*- C++ -* ===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
// Wrapper functions and marcos that use intrinsics instead of builtin functions
|
|
// which cannot be compiled by MSVC.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_FUZZER_BUILTINS_MSVC_H
|
|
#define LLVM_FUZZER_BUILTINS_MSVC_H
|
|
|
|
#include "FuzzerDefs.h"
|
|
|
|
#if LIBFUZZER_MSVC
|
|
#if !defined(_M_ARM) && !defined(_M_X64)
|
|
#error "_BitScanReverse64 unavailable on this platform so MSVC is unsupported."
|
|
#endif
|
|
#include <intrin.h>
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
|
|
// __builtin_return_address() cannot be compiled with MSVC. Use the equivalent
|
|
// from <intrin.h>
|
|
#define GET_CALLER_PC() _ReturnAddress()
|
|
|
|
namespace fuzzer {
|
|
|
|
inline uint8_t Bswap(uint8_t x) { return x; }
|
|
// Use alternatives to __builtin functions from <stdlib.h> and <intrin.h> on
|
|
// Windows since the builtins are not supported by MSVC.
|
|
inline uint16_t Bswap(uint16_t x) { return _byteswap_ushort(x); }
|
|
inline uint32_t Bswap(uint32_t x) { return _byteswap_ulong(x); }
|
|
inline uint64_t Bswap(uint64_t x) { return _byteswap_uint64(x); }
|
|
|
|
// The functions below were mostly copied from
|
|
// compiler-rt/lib/builtins/int_lib.h which defines the __builtin functions used
|
|
// outside of Windows.
|
|
inline uint32_t Clzll(uint64_t X) {
|
|
unsigned long LeadZeroIdx = 0;
|
|
if (_BitScanReverse64(&LeadZeroIdx, X)) return 63 - LeadZeroIdx;
|
|
return 64;
|
|
}
|
|
|
|
inline uint32_t Clz(uint32_t X) {
|
|
unsigned long LeadZeroIdx = 0;
|
|
if (_BitScanReverse(&LeadZeroIdx, X)) return 31 - LeadZeroIdx;
|
|
return 32;
|
|
}
|
|
|
|
inline int Popcountll(unsigned long long X) { return __popcnt64(X); }
|
|
|
|
} // namespace fuzzer
|
|
|
|
#endif // LIBFUZER_MSVC
|
|
#endif // LLVM_FUZZER_BUILTINS_MSVC_H
|