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/**
* @file allocator.h
*
* @brief Memory allocation with LEAK_DETECTION support
*
* Thread-save implementation
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef ALLOCATOR_H_
#define ALLOCATOR_H_
#include <stddef.h>
/**
* Macro to allocate a special type
*
* @param thing object on which a sizeof is performed
* @return
* - Pointer to allocated memory if successful
* - NULL otherwise
*/
#define allocator_alloc_thing(thing) (allocator_alloc(sizeof(thing)))
#ifdef LEAK_DETECTIVE
/**
* @brief Allocater object use to detect memory leaks.
*
*/
typedef struct allocator_s allocator_t;
struct allocator_s {
/**
* Allocates memory with LEAK_DETECTION and
* returns an empty data area filled with zeros.
*
* @warning Use this function not directly, only with assigned macros
* #allocator_alloc and #allocator_alloc_thing.
*
* @param this allocator_t object
* @param bytes number of bytes to allocate
* @param file filename from which the memory is allocated
* @param line line number in specific file
* @return
* - pointer to allocated memory area if successful
* - NULL otherwise
*/
void * (*allocate) (allocator_t *this,size_t bytes, char * file,int line);
/**
* Reallocates memory with LEAK_DETECTION and
* returns an empty data area filled with zeros
*
* @warning Use this function not directly, only with assigned macro
* #allocator_realloc
*
* @param this allocator_t object
* @param old pointer to the old data area
* @param bytes number of bytes to allocate
* @param file filename from which the memory is allocated
* @param line line number in specific file
* @return - pointer to reallocated memory area if successful
* - NULL otherwise
*/
void * (*reallocate) (allocator_t *this,void * old, size_t bytes, char * file, int line);
/**
* Frees memory with LEAK_DETECTION
*
* @warning Use this function not directly, only with assigned macro
* #allocator_free
*
* @param this allocator_t object
* @param pointer pointer to the data area to free
*/
void (*free_pointer) (allocator_t *this,void * pointer);
/**
* Report memory leaks to stderr
*
* @warning Use this function not directly, only with assigned macro
* #report_memory_leaks
*
* @param this allocator_t object
*/
void (*report_memory_leaks) (allocator_t *this);
};
#ifndef ALLOCATOR_C_
/**
* @brief Global allocater_t object.
*
* Only accessed over macros.
*/
extern allocator_t *global_allocator;
#endif
/**
* Macro to allocate some memory
*
* @see #allocator_s.allocate for description
*/
#define allocator_alloc(bytes) (global_allocator->allocate(global_allocator,bytes,__FILE__,__LINE__))
/**
* Macro to reallocate some memory
*
* @see #allocator_s.reallocate for description
*/
#define allocator_realloc(old,bytes) (global_allocator->reallocate(global_allocator,old,bytes,__FILE__, __LINE__))
/**
* Macro to free some memory
*
* @see #allocator_s.free for description
*/
#define allocator_free(pointer) (global_allocator->free_pointer(global_allocator,pointer))
/**
* Macro to free a chunk
*/
#define allocator_free_chunk(chunk){ \
global_allocator->free_pointer(global_allocator,chunk.ptr); \
chunk.ptr = NULL; \
chunk.len = 0; \
}
/**
* Macro to report memory leaks
*
* @see #allocator_s.report_memory_leaks for description
*/
#define report_memory_leaks(void) global_allocator->report_memory_leaks(global_allocator);
#else
#define allocator_alloc(bytes) (malloc(bytes))
#define allocator_realloc(old,bytes) (realloc(old,bytes))
#define allocator_free(pointer) (free(pointer))
#define allocator_free_chunk(chunk){ \
free(chunk.ptr); \
chunk.ptr = NULL; \
chunk.len = 0; \
}
#define report_memory_leaks(void) {}
#endif
#endif /*ALLOCATOR_H_*/
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