/*
 * Copyright 2016 Facebook, 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.
 */

#pragma once

#include <stdlib.h>

#include <folly/Portability.h>

extern "C" {

#if FOLLY_HAVE_WEAK_SYMBOLS
void* mallocx(size_t, int) __attribute__((__weak__));
void* rallocx(void*, size_t, int) __attribute__((__weak__));
size_t xallocx(void*, size_t, size_t, int) __attribute__((__weak__));
size_t sallocx(const void*, int) __attribute__((__weak__));
void dallocx(void*, int) __attribute__((__weak__));
void sdallocx(void*, size_t, int) __attribute__((__weak__));
size_t nallocx(size_t, int) __attribute__((__weak__));
int mallctl(const char*, void*, size_t*, void*, size_t)
      __attribute__((__weak__));
int mallctlnametomib(const char*, size_t*, size_t*) __attribute__((__weak__));
int mallctlbymib(const size_t*, size_t, void*, size_t*, void*, size_t)
      __attribute__((__weak__));
#else
extern void* (*mallocx)(size_t, int);
extern void* (*rallocx)(void*, size_t, int);
extern size_t (*xallocx)(void*, size_t, size_t, int);
extern size_t (*sallocx)(const void*, int);
extern void (*dallocx)(void*, int);
extern void (*sdallocx)(void*, size_t, int);
extern size_t (*nallocx)(size_t, int);
extern int (*mallctl)(const char*, void*, size_t*, void*, size_t);
extern int (*mallctlnametomib)(const char*, size_t*, size_t*);
extern int (*mallctlbymib)(const size_t*, size_t, void*, size_t*, void*,
                           size_t);
#ifdef _MSC_VER
// We emulate weak linkage for MSVC. The symbols we're
// aliasing to are hiding in MallocImpl.cpp
#pragma comment(linker, "/alternatename:mallocx=mallocxWeak")
#pragma comment(linker, "/alternatename:rallocx=rallocxWeak")
#pragma comment(linker, "/alternatename:xallocx=xallocxWeak")
#pragma comment(linker, "/alternatename:sallocx=sallocxWeak")
#pragma comment(linker, "/alternatename:dallocx=dallocxWeak")
#pragma comment(linker, "/alternatename:sdallocx=sdallocxWeak")
#pragma comment(linker, "/alternatename:nallocx=nallocxWeak")
#pragma comment(linker, "/alternatename:mallctl=mallctlWeak")
#pragma comment(linker, "/alternatename:mallctlnametomib=mallctlnametomibWeak")
#pragma comment(linker, "/alternatename:mallctlbymib=mallctlbymibWeak")
#endif
#endif

}