osi/src/allocator.cc

/******************************************************************************
 *
 *  Copyright 2014 Google, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/
#include <base/logging.h>
#include <stdlib.h>
#include <string.h>

#include "check.h"
#include "osi/include/allocation_tracker.h"
#include "osi/include/allocator.h"

static const allocator_id_t alloc_allocator_id = 42;

char* osi_strdup(const char* str) {
  size_t size = strlen(str) + 1;  // + 1 for the null terminator
  size_t real_size = allocation_tracker_resize_for_canary(size);
  void* ptr = malloc(real_size);
  CHECK(ptr);

  char* new_string = static_cast<char*>(
      allocation_tracker_notify_alloc(alloc_allocator_id, ptr, size));
  if (!new_string) return NULL;

  memcpy(new_string, str, size);
  return new_string;
}

char* osi_strndup(const char* str, size_t len) {
  size_t size = strlen(str);
  if (len < size) size = len;

  size_t real_size = allocation_tracker_resize_for_canary(size + 1);
  void* ptr = malloc(real_size);
  CHECK(ptr);

  char* new_string = static_cast<char*>(
      allocation_tracker_notify_alloc(alloc_allocator_id, ptr, size + 1));
  if (!new_string) return NULL;

  memcpy(new_string, str, size);
  new_string[size] = '\0';
  return new_string;
}

void* osi_malloc(size_t size) {
  size_t real_size = allocation_tracker_resize_for_canary(size);
  void* ptr = malloc(real_size);
  CHECK(ptr);
  return allocation_tracker_notify_alloc(alloc_allocator_id, ptr, size);
}

void* osi_calloc(size_t size) {
  size_t real_size = allocation_tracker_resize_for_canary(size);
  void* ptr = calloc(1, real_size);
  CHECK(ptr);
  return allocation_tracker_notify_alloc(alloc_allocator_id, ptr, size);
}

void osi_free(void* ptr) {
  free(allocation_tracker_notify_free(alloc_allocator_id, ptr));
}

void osi_free_and_reset(void** p_ptr) {
  CHECK(p_ptr != NULL);
  osi_free(*p_ptr);
  *p_ptr = NULL;
}

const allocator_t allocator_calloc = {osi_calloc, osi_free};

const allocator_t allocator_malloc = {osi_malloc, osi_free};

OsiObject::OsiObject(void* ptr) : ptr_(ptr) {}

OsiObject::OsiObject(const void* ptr) : ptr_(const_cast<void*>(ptr)) {}

OsiObject::~OsiObject() {
  if (ptr_ != nullptr) {
    osi_free(ptr_);
  }
}

void* OsiObject::Release() {
  void* ptr = ptr_;
  ptr_ = nullptr;
  return ptr;
}