tclalloc.c

CMX990 demonstration board (DE9901)

    if (break_on_malloc && (total_mallocs >= break_on_malloc)) {
        break_on_malloc = 0;
        (void) fflush(stdout);
        fprintf(stderr,"reached malloc break limit (%d)\n", 
                total_mallocs);
        fprintf(stderr, "program will now enter C debugger\n");
        (void) fflush(stderr);
        abort();
    }

    current_malloc_packets++;
    if (current_malloc_packets > maximum_malloc_packets)
        maximum_malloc_packets = current_malloc_packets;
    current_bytes_malloced += size;
    if (current_bytes_malloced > maximum_bytes_malloced)
        maximum_bytes_malloced = current_bytes_malloced;

    if (init_malloced_bodies)
        memset (result->body, 0xff, (int) size);

    return result->body;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbCkfree - debugging ckfree
 *
 *        Verify that the low and high guards are intact, and if so
 *        then free the buffer else panic.
 *
 *        The guards are erased after being checked to catch duplicate
 *        frees.
 *
 *        The second and third arguments are file and line, these contain
 *        the filename and line number corresponding to the caller.
 *        These are sent by the ckfree macro; it uses the preprocessor
 *        autodefines __FILE__ and __LINE__.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_DbCkfree(ptr, file, line)
    char *  ptr;
    char     *file;
    int       line;
{
    struct mem_header *memp = 0;  /* Must be zero for size calc */

    /*
     * Since header ptr is zero, body offset will be size
     */
    memp = (struct mem_header *)(((char *) ptr) - (int)memp->body);

    if (alloc_tracing)
        fprintf(stderr, "ckfree %lx %ld %s %d\n", memp->body, 
                memp->length, file, line);

    if (validate_memory)
        Tcl_ValidateAllMemory (file, line);

    ValidateMemory (memp, file, line, TRUE);

    total_frees++;
    current_malloc_packets--;
    current_bytes_malloced -= memp->length;

    /*
     * Delink from allocated list
     */
    if (memp->flink != NULL)
        memp->flink->blink = memp->blink;
    if (memp->blink != NULL)
        memp->blink->flink = memp->flink;
    if (allocHead == memp)
        allocHead = memp->flink;
    free((char *) memp);
    return 0;
}

/*
 *--------------------------------------------------------------------
 *
 * Tcl_DbCkrealloc - debugging ckrealloc
 *
 *	Reallocate a chunk of memory by allocating a new one of the
 *	right size, copying the old data to the new location, and then
 *	freeing the old memory space, using all the memory checking
 *	features of this package.
 *
 *--------------------------------------------------------------------
 */
char *
Tcl_DbCkrealloc(ptr, size, file, line)
    char *ptr;
    unsigned int size;
    char *file;
    int line;
{
    char *new;

    new = Tcl_DbCkalloc(size, file, line);
    memcpy((VOID *) new, (VOID *) ptr, (int) size);
    Tcl_DbCkfree(ptr, file, line);
    return(new);
}

/*
 *----------------------------------------------------------------------
 *
 * MemoryCmd --
 *     Implements the TCL memory command:
 *       memory info
 *       memory display
 *       break_on_malloc count
 *       trace_on_at_malloc count
 *       trace on|off
 *       validate on|off
 *
 * Results:
 *     Standard TCL results.
 *
 *----------------------------------------------------------------------
 */
	/* ARGSUSED */
static int
MemoryCmd (clientData, interp, argc, argv)
    char       *clientData;
    Tcl_Interp *interp;
    int         argc;
    char      **argv;
{
    char *fileName;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args:  should be \"",
		argv[0], " option [args..]\"", (char *) NULL);
	return TCL_ERROR;
    }

    if (strcmp(argv[1],"trace") == 0) {
        if (argc != 3) 
            goto bad_suboption;
        alloc_tracing = (strcmp(argv[2],"on") == 0);
        return TCL_OK;
    }
    if (strcmp(argv[1],"init") == 0) {
        if (argc != 3)
            goto bad_suboption;
        init_malloced_bodies = (strcmp(argv[2],"on") == 0);
        return TCL_OK;
    }
    if (strcmp(argv[1],"validate") == 0) {
        if (argc != 3)
             goto bad_suboption;
        validate_memory = (strcmp(argv[2],"on") == 0);
        return TCL_OK;
    }
    if (strcmp(argv[1],"trace_on_at_malloc") == 0) {
        if (argc != 3) 
            goto argError;
        if (Tcl_GetInt(interp, argv[2], &trace_on_at_malloc) != TCL_OK)
                return TCL_ERROR;
         return TCL_OK;
    }
    if (strcmp(argv[1],"break_on_malloc") == 0) {
        if (argc != 3) 
            goto argError;
        if (Tcl_GetInt(interp, argv[2], &break_on_malloc) != TCL_OK)
                return TCL_ERROR;
        return TCL_OK;
    }

    if (strcmp(argv[1],"info") == 0) {
        dump_memory_info(stdout);
        return TCL_OK;
    }
    if (strcmp(argv[1],"active") == 0) {
        if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # args:  should be \"",
		    argv[0], " active file", (char *) NULL);
	    return TCL_ERROR;
	}
        fileName = argv [2];
        if (fileName [0] == '~')
            if ((fileName = Tcl_TildeSubst (interp, fileName)) == NULL)
                return TCL_ERROR;
        if (Tcl_DumpActiveMemory (fileName) != TCL_OK) {
	    Tcl_AppendResult(interp, "error accessing ", argv[2], 
		    (char *) NULL);
	    return TCL_ERROR;
	}
	return TCL_OK;
    }
    Tcl_AppendResult(interp, "bad option \"", argv[1],
	    "\":  should be info, init, active, break_on_malloc, ",
	    "trace_on_at_malloc, trace, or validate", (char *) NULL);
    return TCL_ERROR;

argError:
    Tcl_AppendResult(interp, "wrong # args:  should be \"", argv[0],
	    " ", argv[1], "count\"", (char *) NULL);
    return TCL_ERROR;

bad_suboption:
    Tcl_AppendResult(interp, "wrong # args:  should be \"", argv[0],
	    " ", argv[1], " on|off\"", (char *) NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitMemory --
 *     Initialize the memory command.
 *
 *----------------------------------------------------------------------
 */
void
Tcl_InitMemory(interp)
    Tcl_Interp *interp;
{
Tcl_CreateCommand (interp, "memory", MemoryCmd, (ClientData)NULL, 
                  (void (*)())NULL);
}

#else


/*
 *----------------------------------------------------------------------
 *
 * Tcl_Ckalloc --
 *     Interface to malloc when TCL_MEM_DEBUG is disabled.  It does check
 *     that memory was actually allocated.
 *
 *----------------------------------------------------------------------
 */
VOID *Tcl_Ckalloc(unsigned int size) {
  char *result;
  
  result = malloc(size);
  if (result == NULL) {
    panic("unable to alloc %d bytes", size);
  }
  return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TckCkfree --
 *     Interface to free when TCL_MEM_DEBUG is disabled.  Done here rather
 *     in the macro to keep some modules from being compiled with 
 *     TCL_MEM_DEBUG enabled and some with it disabled.
 *
 *----------------------------------------------------------------------
 */
void Tcl_Ckfree(VOID *ptr) {
  free (ptr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitMemory --
 *     Dummy initialization for memory command, which is only available 
 *     if TCL_MEM_DEBUG is on.
 *
 *----------------------------------------------------------------------
 */
	/* ARGSUSED */
void
Tcl_InitMemory(interp)
    Tcl_Interp *interp;
{
}

#endif