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f6b6a7722e
There's an ABI breakage here if LLVM is compiled in C++14 without aligned allocation and a user tries to use the result with aligned allocation. If DenseMap or unique_function is used across that ABI boundary it will break (PR45413). Moving it out of line is a bit of a band-aid and LLVM doesn't really give ABI guarantees at this level, but given the number of complaints I've received over this it still seems worth fixing.
88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
//===- MemAlloc.h - Memory allocation functions -----------------*- 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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/// \file
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///
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/// This file defines counterparts of C library allocation functions defined in
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/// the namespace 'std'. The new allocation functions crash on allocation
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/// failure instead of returning null pointer.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_MEMALLOC_H
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#define LLVM_SUPPORT_MEMALLOC_H
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstdlib>
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namespace llvm {
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LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_malloc(size_t Sz) {
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void *Result = std::malloc(Sz);
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if (Result == nullptr) {
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// It is implementation-defined whether allocation occurs if the space
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// requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
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// non-zero, if the space requested was zero.
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if (Sz == 0)
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return safe_malloc(1);
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report_bad_alloc_error("Allocation failed");
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}
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return Result;
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}
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LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_calloc(size_t Count,
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size_t Sz) {
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void *Result = std::calloc(Count, Sz);
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if (Result == nullptr) {
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// It is implementation-defined whether allocation occurs if the space
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// requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
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// non-zero, if the space requested was zero.
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if (Count == 0 || Sz == 0)
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return safe_malloc(1);
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report_bad_alloc_error("Allocation failed");
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}
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return Result;
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}
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LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_realloc(void *Ptr, size_t Sz) {
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void *Result = std::realloc(Ptr, Sz);
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if (Result == nullptr) {
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// It is implementation-defined whether allocation occurs if the space
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// requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
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// non-zero, if the space requested was zero.
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if (Sz == 0)
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return safe_malloc(1);
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report_bad_alloc_error("Allocation failed");
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}
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return Result;
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}
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/// Allocate a buffer of memory with the given size and alignment.
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///
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/// When the compiler supports aligned operator new, this will use it to to
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/// handle even over-aligned allocations.
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///
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/// However, this doesn't make any attempt to leverage the fancier techniques
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/// like posix_memalign due to portability. It is mostly intended to allow
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/// compatibility with platforms that, after aligned allocation was added, use
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/// reduced default alignment.
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LLVM_ATTRIBUTE_RETURNS_NONNULL LLVM_ATTRIBUTE_RETURNS_NOALIAS void *
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allocate_buffer(size_t Size, size_t Alignment);
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/// Deallocate a buffer of memory with the given size and alignment.
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///
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/// If supported, this will used the sized delete operator. Also if supported,
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/// this will pass the alignment to the delete operator.
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///
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/// The pointer must have been allocated with the corresponding new operator,
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/// most likely using the above helper.
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void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment);
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} // namespace llvm
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#endif
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