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68 lines
2.0 KiB
68 lines
2.0 KiB
4 months ago
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//===-- wrappers_c_checks.h -------------------------------------*- 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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#ifndef SCUDO_CHECKS_H_
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#define SCUDO_CHECKS_H_
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#include "common.h"
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#include <errno.h>
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#ifndef __has_builtin
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#define __has_builtin(X) 0
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#endif
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namespace scudo {
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// A common errno setting logic shared by almost all Scudo C wrappers.
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inline void *setErrnoOnNull(void *Ptr) {
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if (UNLIKELY(!Ptr))
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errno = ENOMEM;
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return Ptr;
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}
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// Checks return true on failure.
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// Checks aligned_alloc() parameters, verifies that the alignment is a power of
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// two and that the size is a multiple of alignment.
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inline bool checkAlignedAllocAlignmentAndSize(uptr Alignment, uptr Size) {
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return Alignment == 0 || !isPowerOfTwo(Alignment) ||
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!isAligned(Size, Alignment);
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}
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// Checks posix_memalign() parameters, verifies that alignment is a power of two
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// and a multiple of sizeof(void *).
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inline bool checkPosixMemalignAlignment(uptr Alignment) {
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return Alignment == 0 || !isPowerOfTwo(Alignment) ||
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!isAligned(Alignment, sizeof(void *));
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}
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// Returns true if calloc(Size, N) overflows on Size*N calculation. Use a
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// builtin supported by recent clang & GCC if it exists, otherwise fallback to a
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// costly division.
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inline bool checkForCallocOverflow(uptr Size, uptr N, uptr *Product) {
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#if __has_builtin(__builtin_umull_overflow)
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return __builtin_umull_overflow(Size, N, Product);
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#else
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*Product = Size * N;
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if (!Size)
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return false;
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return (*Product / Size) != N;
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#endif
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}
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// Returns true if the size passed to pvalloc overflows when rounded to the next
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// multiple of PageSize.
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inline bool checkForPvallocOverflow(uptr Size, uptr PageSize) {
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return roundUpTo(Size, PageSize) < Size;
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}
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} // namespace scudo
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#endif // SCUDO_CHECKS_H_
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