lib/Support/regmalloc.cpp

//===-- regmalloc.cpp - Memory allocation for regex implementation --------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Support operator new/delete overriding for regex memory allocations.
//===----------------------------------------------------------------------===//

#include "regutils.h"
#include <algorithm>
#include <cstring>
#include <new>

extern "C" {
void *regex_malloc(size_t size) { return ::operator new(size, std::nothrow); }
void *regex_calloc(size_t num, size_t size) {
  void *ptr = regex_malloc(num * size);
  if (ptr)
    std::memset(ptr, 0, num * size);
  return ptr;
}
void *regex_realloc(void *ptr, size_t oldsize, size_t newsize) {
  void *newptr = regex_malloc(newsize);
  if (ptr == nullptr)
    return newptr;
  if (newptr == nullptr)
    return nullptr;
  std::memcpy(newptr, ptr, std::min(oldsize, newsize));
  regex_free(ptr);
  return newptr;
}
void regex_free(void *ptr) { return ::operator delete(ptr); }
}