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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- MemAlloc.h - Memory allocation functions -----------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | /// \file |
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| 9 | /// |
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| 10 | /// This file defines counterparts of C library allocation functions defined in |
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| 11 | /// the namespace 'std'. The new allocation functions crash on allocation |
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| 12 | /// failure instead of returning null pointer. |
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| 13 | /// |
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| 14 | //===----------------------------------------------------------------------===// |
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| 15 | |||
| 16 | #ifndef LLVM_SUPPORT_MEMALLOC_H |
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| 17 | #define LLVM_SUPPORT_MEMALLOC_H |
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| 18 | |||
| 19 | #include "llvm/Support/Compiler.h" |
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| 20 | #include "llvm/Support/ErrorHandling.h" |
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| 21 | #include <cstdlib> |
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| 22 | |||
| 23 | namespace llvm { |
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| 24 | |||
| 25 | LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_malloc(size_t Sz) { |
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| 26 | void *Result = std::malloc(Sz); |
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| 27 | if (Result == nullptr) { |
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| 28 | // It is implementation-defined whether allocation occurs if the space |
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| 29 | // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting |
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| 30 | // non-zero, if the space requested was zero. |
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| 31 | if (Sz == 0) |
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| 32 | return safe_malloc(1); |
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| 33 | report_bad_alloc_error("Allocation failed"); |
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| 34 | } |
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| 35 | return Result; |
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| 36 | } |
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| 37 | |||
| 38 | LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_calloc(size_t Count, |
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| 39 | size_t Sz) { |
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| 40 | void *Result = std::calloc(Count, Sz); |
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| 41 | if (Result == nullptr) { |
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| 42 | // It is implementation-defined whether allocation occurs if the space |
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| 43 | // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting |
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| 44 | // non-zero, if the space requested was zero. |
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| 45 | if (Count == 0 || Sz == 0) |
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| 46 | return safe_malloc(1); |
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| 47 | report_bad_alloc_error("Allocation failed"); |
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| 48 | } |
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| 49 | return Result; |
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| 50 | } |
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| 51 | |||
| 52 | LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_realloc(void *Ptr, size_t Sz) { |
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| 53 | void *Result = std::realloc(Ptr, Sz); |
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| 54 | if (Result == nullptr) { |
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| 55 | // It is implementation-defined whether allocation occurs if the space |
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| 56 | // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting |
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| 57 | // non-zero, if the space requested was zero. |
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| 58 | if (Sz == 0) |
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| 59 | return safe_malloc(1); |
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| 60 | report_bad_alloc_error("Allocation failed"); |
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| 61 | } |
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| 62 | return Result; |
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| 63 | } |
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| 64 | |||
| 65 | /// Allocate a buffer of memory with the given size and alignment. |
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| 66 | /// |
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| 67 | /// When the compiler supports aligned operator new, this will use it to to |
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| 68 | /// handle even over-aligned allocations. |
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| 69 | /// |
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| 70 | /// However, this doesn't make any attempt to leverage the fancier techniques |
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| 71 | /// like posix_memalign due to portability. It is mostly intended to allow |
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| 72 | /// compatibility with platforms that, after aligned allocation was added, use |
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| 73 | /// reduced default alignment. |
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| 74 | LLVM_ATTRIBUTE_RETURNS_NONNULL LLVM_ATTRIBUTE_RETURNS_NOALIAS void * |
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| 75 | allocate_buffer(size_t Size, size_t Alignment); |
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| 76 | |||
| 77 | /// Deallocate a buffer of memory with the given size and alignment. |
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| 78 | /// |
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| 79 | /// If supported, this will used the sized delete operator. Also if supported, |
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| 80 | /// this will pass the alignment to the delete operator. |
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| 81 | /// |
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| 82 | /// The pointer must have been allocated with the corresponding new operator, |
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| 83 | /// most likely using the above helper. |
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| 84 | void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment); |
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| 85 | |||
| 86 | } // namespace llvm |
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| 87 | #endif |