/*
  Copyright (c) DataStax, 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 "memory.hpp"

#include <assert.h>
#include <new>
#include <string.h>

#include <uv.h>

using namespace datastax::internal;

extern "C" {

void cass_alloc_set_functions(CassMallocFunction malloc_func, CassReallocFunction realloc_func,
                              CassFreeFunction free_func) {
  Memory::set_functions(malloc_func, realloc_func, free_func);
}

} // extern "C"

#ifdef DEBUG_CUSTOM_ALLOCATOR
void* operator new(size_t size) throw(std::bad_alloc) {
  assert(false && "Attempted to use global operator new");
  return cass::Memory::malloc(size);
}

void* operator new[](size_t size) throw(std::bad_alloc) {
  assert(false && "Attempted to use global operator new[]");
  return cass::Memory::malloc(size);
}

void operator delete(void* ptr) throw() {
  assert(false && "Attempted to use global operator delete");
  cass::Memory::free(ptr);
}

void operator delete[](void* ptr) throw() {
  assert(false && "Attempted to use global operator delete[]");
  cass::Memory::free(ptr);
}
#endif

CassMallocFunction Memory::malloc_func_ = NULL;
CassReallocFunction Memory::realloc_func_ = NULL;
CassFreeFunction Memory::free_func_ = NULL;

#if UV_VERSION_MAJOR >= 1 && UV_VERSION_MINOR >= 6
static void* calloc_(size_t count, size_t size) {
  void* ptr = Memory::malloc(count * size);
  if (ptr != NULL) {
    memset(ptr, 0, count * size);
  }
  return ptr;
}
#endif

void Memory::set_functions(CassMallocFunction malloc_func, CassReallocFunction realloc_func,
                           CassFreeFunction free_func) {
  if (malloc_func == NULL || realloc_func == NULL || free_func == NULL) {
    Memory::malloc_func_ = NULL;
    Memory::realloc_func_ = NULL;
    Memory::free_func_ = NULL;
  } else {
    Memory::malloc_func_ = malloc_func;
    Memory::realloc_func_ = realloc_func;
    Memory::free_func_ = free_func;
  }
#if UV_VERSION_MAJOR >= 1 && UV_VERSION_MINOR >= 6
  uv_replace_allocator(Memory::malloc_func_, Memory::realloc_func_, calloc_, Memory::free_func_);
#endif
}