MemAlloc.h

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//===- MemAlloc.h - Memory allocation functions -----------------*- 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
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines counterparts of C library allocation functions defined in
/// the namespace 'std'. The new allocation functions crash on allocation
/// failure instead of returning null pointer.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_MEMALLOC_H
#define LLVM_SUPPORT_MEMALLOC_H

#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdlib>

namespace llvm {

LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_malloc(size_t Sz) {
  void *Result = std::malloc(Sz);
  if (Result == nullptr) {
    // It is implementation-defined whether allocation occurs if the space
    // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
    // non-zero, if the space requested was zero.
    if (Sz == 0)
      return safe_malloc(1);
    report_bad_alloc_error("Allocation failed");
  }
  return Result;
}

LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_calloc(size_t Count,
                                                        size_t Sz) {
  void *Result = std::calloc(Count, Sz);
  if (Result == nullptr) {
    // It is implementation-defined whether allocation occurs if the space
    // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
    // non-zero, if the space requested was zero.
    if (Count == 0 || Sz == 0)
      return safe_malloc(1);
    report_bad_alloc_error("Allocation failed");
  }
  return Result;
}

LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_realloc(void *Ptr, size_t Sz) {
  void *Result = std::realloc(Ptr, Sz);
  if (Result == nullptr) {
    // It is implementation-defined whether allocation occurs if the space
    // requested is zero (ISO/IEC 9899:2018 7.22.3). Retry, requesting
    // non-zero, if the space requested was zero.
    if (Sz == 0)
      return safe_malloc(1);
    report_bad_alloc_error("Allocation failed");
  }
  return Result;
}

}
#endif