base/allocator/allocator_shim_default_dispatch_to_glibc.cc

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/allocator/allocator_shim.h"

// This translation unit defines a default dispatch for the allocator shim which
// routes allocations to libc functions.
// The code here is strongly inspired from tcmalloc's libc_override_glibc.h.

extern "C" {
void* __libc_malloc(size_t size);
void* __libc_calloc(size_t n, size_t size);
void* __libc_realloc(void* address, size_t size);
void* __libc_memalign(size_t alignment, size_t size);
void __libc_free(void* ptr);
}  // extern "C"

namespace {

using base::allocator::AllocatorDispatch;

void* GlibcMalloc(const AllocatorDispatch*, size_t size) {
  return __libc_malloc(size);
}

void* GlibcCalloc(const AllocatorDispatch*, size_t n, size_t size) {
  return __libc_calloc(n, size);
}

void* GlibcRealloc(const AllocatorDispatch*, void* address, size_t size) {
  return __libc_realloc(address, size);
}

void* GlibcMemalign(const AllocatorDispatch*, size_t alignment, size_t size) {
  return __libc_memalign(alignment, size);
}

void GlibcFree(const AllocatorDispatch*, void* address) {
  __libc_free(address);
}

}  // namespace

const AllocatorDispatch AllocatorDispatch::default_dispatch = {
    &GlibcMalloc,   /* alloc_function */
    &GlibcCalloc,   /* alloc_zero_initialized_function */
    &GlibcMemalign, /* alloc_aligned_function */
    &GlibcRealloc,  /* realloc_function */
    &GlibcFree,     /* free_function */
    nullptr,        /* next */
};