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allocate.c

/*
 * allocate.c
 *
 * Copyright (C) 2006 Simon Wunderlich <dotslash@packetmixer.de>
 *                    Marek Lindner <lindner_marek@yahoo.de>
 *
 * This file is part of meshs3d, an olsr/batman topology visualizer for s3d.
 * See http://s3d.berlios.de/ for more updates.
 *
 * olsrs3d 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.
 *
 * olsrs3d 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with olsrs3d; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */



#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "allocate.h"

#define DEBUG_MALLOC
#define MEMORY_USAGE

#define MAGIC_NUMBER 0x12345678

#if defined DEBUG_MALLOC

static struct chunkHeader *chunkList = NULL;

struct chunkHeader {
      struct chunkHeader *next;
      uint32_t length;
      int32_t tag;
      uint32_t magicNumber;
};

struct chunkTrailer {
      uint32_t magicNumber;
};



#if defined MEMORY_USAGE

static struct memoryUsage *memoryList = NULL;


struct memoryUsage {
      struct memoryUsage *next;
      uint32_t length;
      uint32_t counter;
      int32_t tag;
};


static void addMemory(uint32_t length, int32_t tag)
{

      struct memoryUsage *walker;


      for (walker = memoryList; walker != NULL; walker = walker->next) {

            if (walker->tag == tag) {

                  walker->counter++;
                  break;

            }

      }

      if (walker == NULL) {

            walker = (struct memoryUsage*)malloc(sizeof(struct memoryUsage));

            walker->length = length;
            walker->tag = tag;
            walker->counter = 1;

            walker->next = memoryList;
            memoryList = walker;

      }

}


static void removeMemory(int32_t tag, int32_t freetag)
{

      struct memoryUsage *walker;


      for (walker = memoryList; walker != NULL; walker = walker->next) {

            if (walker->tag == tag) {

                  if (walker->counter == 0) {

                        fprintf(stderr, "Freeing more memory than was allocated: malloc tag = %d, free tag = %d\n", tag, freetag);
                        exit(1);

                  }

                  walker->counter--;
                  break;

            }

      }

      if (walker == NULL) {

            fprintf(stderr, "Freeing memory that was never allocated: malloc tag = %d, free tag = %d\n", tag, freetag);
            exit(1);

      }

}

#endif



void checkIntegrity(void)
{
      struct chunkHeader *walker;
      struct chunkTrailer *chunkTrailer;
      unsigned char *memory;


#if defined MEMORY_USAGE

      struct memoryUsage *memoryWalker;

      fprintf(stderr, " \nMemory usage information:\n");

      for (memoryWalker = memoryList; memoryWalker != NULL; memoryWalker = memoryWalker->next) {

            if (memoryWalker->counter != 0)
                  fprintf(stderr, "   tag: %d, num malloc: %4i, bytes per malloc: %u, total: %6i\n", memoryWalker->tag, memoryWalker->counter, memoryWalker->length, memoryWalker->counter * memoryWalker->length);

      }

#endif


      for (walker = chunkList; walker != NULL; walker = walker->next) {
            if (walker->magicNumber != MAGIC_NUMBER) {
                  fprintf(stderr, "checkIntegrity - invalid magic number in header: %08x, malloc tag = %d\n", walker->magicNumber, walker->tag);
                  exit(1);
            }

            memory = (unsigned char *)walker;

            chunkTrailer = (struct chunkTrailer *)(memory + sizeof(struct chunkHeader) + walker->length);

            if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
                  fprintf(stderr, "checkIntegrity - invalid magic number in trailer: %08x, malloc tag = %d\n", chunkTrailer->magicNumber, walker->tag);
                  exit(1);
            }
      }
}

void checkLeak(void)
{
      struct chunkHeader *walker;

      for (walker = chunkList; walker != NULL; walker = walker->next)
            fprintf(stderr, "Memory leak detected, malloc tag = %d\n", walker->tag);
}

void *debugMalloc(uint32_t length, int32_t tag)
{
      unsigned char *memory;
      struct chunkHeader *chunkHeader;
      struct chunkTrailer *chunkTrailer;
      unsigned char *chunk;

      /* printf("sizeof(struct chunkHeader) = %u, sizeof (struct chunkTrailer) = %u\n", sizeof (struct chunkHeader), sizeof (struct chunkTrailer)); */

      memory = (unsigned char*)malloc(length + sizeof(struct chunkHeader) + sizeof(struct chunkTrailer));

      if (memory == NULL) {
            fprintf(stderr, "Cannot allocate %u bytes, malloc tag = %d\n", (unsigned int)(length + sizeof(struct chunkHeader) + sizeof(struct chunkTrailer)), tag);
            exit(1);
      }

      chunkHeader = (struct chunkHeader *)memory;
      chunk = memory + sizeof(struct chunkHeader);
      chunkTrailer = (struct chunkTrailer *)(memory + sizeof(struct chunkHeader) + length);

      chunkHeader->length = length;
      chunkHeader->tag = tag;
      chunkHeader->magicNumber = MAGIC_NUMBER;

      chunkTrailer->magicNumber = MAGIC_NUMBER;

      chunkHeader->next = chunkList;
      chunkList = chunkHeader;

#if defined MEMORY_USAGE

      addMemory(length, tag);

#endif

      return chunk;
}

void *debugRealloc(void *memoryParameter, uint32_t length, int32_t tag)
{
      unsigned char *memory;
      struct chunkHeader *chunkHeader;
      struct chunkTrailer *chunkTrailer;
      unsigned char *result;
      uint32_t copyLength;

      if (memoryParameter) { /* if memoryParameter==NULL, realloc() should work like malloc() !! */
            memory = (unsigned char*)memoryParameter;
            chunkHeader = (struct chunkHeader *)(memory - sizeof(struct chunkHeader));

            if (chunkHeader->magicNumber != MAGIC_NUMBER) {
                  fprintf(stderr, "debugRealloc - invalid magic number in header: %08x, malloc tag = %d\n", chunkHeader->magicNumber, chunkHeader->tag);
                  exit(1);
            }

            chunkTrailer = (struct chunkTrailer *)(memory + chunkHeader->length);

            if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
                  fprintf(stderr, "debugRealloc - invalid magic number in trailer: %08x, malloc tag = %d\n", chunkTrailer->magicNumber, chunkHeader->tag);
                  exit(1);
            }
      }


      result = (unsigned char*)debugMalloc(length, tag);
      if (memoryParameter) {
            copyLength = length;

            if (copyLength > chunkHeader->length)
                  copyLength = chunkHeader->length;

            memcpy(result, memoryParameter, copyLength);
            debugFree(memoryParameter, 9999);
      }


      return result;
}

void debugFree(void *memoryParameter, int tag)
{
      unsigned char *memory;
      struct chunkHeader *chunkHeader;
      struct chunkTrailer *chunkTrailer;
      struct chunkHeader *walker;
      struct chunkHeader *previous;

      memory = (unsigned char*)memoryParameter;
      chunkHeader = (struct chunkHeader *)(memory - sizeof(struct chunkHeader));

      if (chunkHeader->magicNumber != MAGIC_NUMBER) {
            fprintf(stderr, "debugFree - invalid magic number in header: %08x, malloc tag = %d, free tag = %d\n", chunkHeader->magicNumber, chunkHeader->tag, tag);
            exit(1);
      }

      previous = NULL;

      for (walker = chunkList; walker != NULL; walker = walker->next) {
            if (walker == chunkHeader)
                  break;

            previous = walker;
      }

      if (walker == NULL) {
            fprintf(stderr, "Double free detected, malloc tag = %d, free tag = %d\n", chunkHeader->tag, tag);
            exit(1);
      }

      if (previous == NULL)
            chunkList = walker->next;

      else
            previous->next = walker->next;

      chunkTrailer = (struct chunkTrailer *)(memory + chunkHeader->length);

      if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
            fprintf(stderr, "debugFree - invalid magic number in trailer: %08x, malloc tag = %d, free tag = %d\n", chunkTrailer->magicNumber, chunkHeader->tag, tag);
            exit(1);
      }

#if defined MEMORY_USAGE

      removeMemory(chunkHeader->tag, tag);

#endif

      free(chunkHeader);

}

#else

void checkIntegrity(void)
{
}

void checkLeak(void)
{
}

void *debugMalloc(uint32_t length, int32_t tag)
{
      void *result;

      result = malloc(length);

      if (result == NULL) {
            fprintf(stderr, "Cannot allocate %u bytes, malloc tag = %d\n", length, tag);
            exit(1);
      }

      return result;
}

void *debugRealloc(void *memory, uint32_t length, int32_t tag)
{
      void *result;

      result = realloc(memory, length);

      if (result == NULL) {
            fprintf(stderr, "Cannot re-allocate %u bytes, malloc tag = %d\n", length, tag);
            exit(1);
      }

      return result;
}

void debugFree(void *memory, int32_t tag)
{
      free(memory);
}

#endif

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