dist/src/Alloc.c

/***********************************************************
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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DEALINGS IN THE SOFTWARE.

Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
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******************************************************************/

/*

Copyright 1987, 1988, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/

/*
 * X Toolkit Memory Allocation Routines
 *
 * Uses Xlib memory management, which is spec'd to be re-entrant.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "IntrinsicI.h"
#include "InitialI.h"
#undef _XBCOPYFUNC

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

#define Xmalloc(size) malloc((size))
#define Xrealloc(ptr, size) realloc((ptr), (size))
#define Xcalloc(nelem, elsize) calloc((nelem), (elsize))
#define Xfree(ptr) free(ptr)

#ifdef _XNEEDBCOPYFUNC
void _XtBcopy(
    char *src, char *dst,
    int length)
{
    if (src < dst) {
	dst += length;
	src += length;
	while (length--)
	    *--dst = *--src;
    } else {
	while (length--)
	    *dst++ = *src++;
    }
}
#endif

void _XtAllocError(
    String type)
{
    Cardinal num_params = 1;
    if (type == NULL) type = "local memory allocation";
    XtErrorMsg("allocError", type, XtCXtToolkitError,
	       "Cannot perform %s", &type, &num_params);
}

void _XtHeapInit(
    Heap*	heap)
{
    heap->start = NULL;
    heap->bytes_remaining = 0;
}

/* Version of asprintf() using XtMalloc
 * Not currently available in XTTRACEMEMORY version, since that would
 * require varargs macros everywhere, which are only standard in C99 & later.
 */
Cardinal XtAsprintf(
    String *new_string,
    _Xconst char * _X_RESTRICT_KYWD format,
    ...)
{
    char buf[256];
    Cardinal len;
    va_list ap;

    va_start(ap, format);
    len = vsnprintf(buf, sizeof(buf), format, ap);
    va_end(ap);

    if (len < 0)
	_XtAllocError("vsnprintf");

    *new_string = XtMalloc(len + 1); /* snprintf doesn't count trailing '\0' */
    if (len < sizeof(buf))
    {
	strncpy(*new_string, buf, len);
	(*new_string)[len] = '\0';
    }
    else
    {
	va_start(ap, format);
	if (vsnprintf(*new_string, len + 1, format, ap) < 0)
	    _XtAllocError("vsnprintf");
	va_end(ap);
    }
    return len;
}


#ifndef XTTRACEMEMORY

char *XtMalloc(
    unsigned size)
{
    char *ptr;

#if defined(MALLOC_0_RETURNS_NULL) && defined(XTMALLOC_BC)
    /* preserve this (broken) behavior until everyone fixes their apps */
    if (!size) size = 1;
#endif
    if ((ptr = Xmalloc(size)) == NULL)
        _XtAllocError("malloc");

    return(ptr);
}

char *XtRealloc(
    char     *ptr,
    unsigned size)
{
   if (ptr == NULL) {
#ifdef MALLOC_0_RETURNS_NULL
	if (!size) size = 1;
#endif
	return(XtMalloc(size));
   } else if ((ptr = Xrealloc(ptr, size)) == NULL
#ifdef MALLOC_0_RETURNS_NULL
		&& size
#endif
	)
	_XtAllocError("realloc");

   return(ptr);
}

char *XtCalloc(
    unsigned num, unsigned size)
{
    char *ptr;

#if defined(MALLOC_0_RETURNS_NULL) && defined(XTMALLOC_BC)
    /* preserve this (broken) behavior until everyone fixes their apps */
    if (!size) num = size = 1;
#endif
    if ((ptr = Xcalloc(num, size)) == NULL)
	_XtAllocError("calloc");

    return(ptr);
}

void XtFree(
    char *ptr)
{
    if (ptr != NULL) Xfree(ptr);
}

char* __XtMalloc(
    unsigned size)
{
#ifdef MALLOC_0_RETURNS_NULL
    if (!size) size = 1;
#endif
    return XtMalloc (size);
}

char* __XtCalloc(
    unsigned num, unsigned size)
{
#ifdef MALLOC_0_RETURNS_NULL
    if (!size) num = size = 1;
#endif
    return XtCalloc(num, size);
}

#ifndef HEAP_SEGMENT_SIZE
#define HEAP_SEGMENT_SIZE 1492
#endif

char* _XtHeapAlloc(
    Heap*	heap,
    Cardinal	bytes)
{
    register char* heap_loc;
    if (heap == NULL) return XtMalloc(bytes);
    if (heap->bytes_remaining < (int)bytes) {
	if ((bytes + sizeof(char*)) >= (HEAP_SEGMENT_SIZE>>1)) {
	    /* preserve current segment; insert this one in front */
#ifdef _TRACE_HEAP
	    printf( "allocating large segment (%d bytes) on heap %#x\n",
		    bytes, heap );
#endif
	    heap_loc = XtMalloc(bytes + sizeof(char*));
	    if (heap->start) {
		*(char**)heap_loc = *(char**)heap->start;
		*(char**)heap->start = heap_loc;
	    }
	    else {
		*(char**)heap_loc = NULL;
		heap->start = heap_loc;
	    }
	    return heap_loc + sizeof(char*);
	}
	/* else discard remainder of this segment */
#ifdef _TRACE_HEAP
	printf( "allocating new segment on heap %#x\n", heap );
#endif
	heap_loc = XtMalloc((unsigned)HEAP_SEGMENT_SIZE);
	*(char**)heap_loc = heap->start;
	heap->start = heap_loc;
	heap->current = heap_loc + sizeof(char*);
	heap->bytes_remaining = HEAP_SEGMENT_SIZE - sizeof(char*);
    }
    bytes = (bytes + (sizeof(long) - 1)) & (~(sizeof(long) - 1));
    heap_loc = heap->current;
    heap->current += bytes;
    heap->bytes_remaining -= bytes; /* can be negative, if rounded */
    return heap_loc;
}

void _XtHeapFree(
    Heap*	heap)
{
    char* segment = heap->start;
    while (segment != NULL) {
	char* next_segment = *(char**)segment;
	XtFree(segment);
	segment = next_segment;
    }
    heap->start = NULL;
    heap->bytes_remaining = 0;
}

#else

/*
 * X Toolkit Memory Trace Allocation Routines
 */

#undef XtMalloc
#undef XtRealloc
#undef XtCalloc
#undef XtFree

typedef struct _Stats *StatsPtr;
typedef struct _Stats {
    StatsPtr prev, next;
    char *file;
    int line;
    unsigned size;
    unsigned long seq;
    XtPointer heap;
} Stats;

static StatsPtr XtMemory = (StatsPtr)NULL;
static unsigned long ActiveXtMemory = 0;
static unsigned long XtSeqId = 0;
static unsigned long XtSeqBreakpoint = ~0;

#define StatsSize(n) ((((n) + (sizeof(long) - 1)) & ~(sizeof(long) - 1)) + sizeof(Stats))
#define ToStats(ptr) ((StatsPtr)(ptr - sizeof(Stats)))
#define ToMem(ptr) (((char *)ptr) + sizeof(Stats))

#define CHAIN(ptr,len,hp) \
    ptr->next = XtMemory; \
    if (XtMemory) \
        XtMemory->prev = ptr; \
    XtMemory = ptr; \
    ptr->prev = (StatsPtr)NULL; \
    ptr->file = file; \
    ptr->line = line; \
    ptr->size = len; \
    ptr->heap = hp; \
    if (file) \
	ActiveXtMemory += len; \
    ptr->seq = XtSeqId; \
    if (XtSeqId == XtSeqBreakpoint) \
	_XtBreakpoint(ptr); \
    XtSeqId++

/*ARGUSED*/
static void _XtBreakpoint(
    StatsPtr mem)
{
    mem->seq = XtSeqId; /* avoid being optimized out of existence */
}

char *_XtMalloc(
    unsigned size,
    char *file,
    int line)
{
    StatsPtr ptr;
    unsigned newsize;
    char* retval = NULL;

    LOCK_PROCESS;
    newsize = StatsSize(size);
    if ((ptr = (StatsPtr)Xmalloc(newsize)) == NULL)
        _XtAllocError("malloc");
    CHAIN(ptr, size, NULL);
    retval = (ToMem(ptr));
    UNLOCK_PROCESS;
    return retval;
}

char *XtMalloc(
    unsigned size)
{
    return _XtMalloc(size, (char *)NULL, 0);
}

char *_XtRealloc(
    char     *ptr,
    unsigned size,
    char *file,
    int line)
{
   char *newptr;

   LOCK_PROCESS;
   newptr = _XtMalloc(size, file, line);
   if (ptr) {
       unsigned copysize = ToStats(ptr)->size;
       if (copysize > size) copysize = size;
       memmove(newptr, ptr, copysize);
       _XtFree(ptr);
   }
   UNLOCK_PROCESS;
   return(newptr);
}

char *XtRealloc(
    char     *ptr,
    unsigned size)
{
    return _XtRealloc(ptr, size, (char *)NULL, 0);
}

char *_XtCalloc(
    unsigned num, unsigned size,
    char *file,
    int line)
{
    StatsPtr ptr;
    unsigned total, newsize;
    char* retval = NULL;

    LOCK_PROCESS;
    total = num * size;
    newsize = StatsSize(total);
    if ((ptr = (StatsPtr)Xcalloc(newsize, 1)) == NULL)
        _XtAllocError("calloc");
    CHAIN(ptr, total, NULL);
    retval = (ToMem(ptr));
    UNLOCK_PROCESS;
    return retval;
}

char *XtCalloc(
    unsigned num, unsigned size)
{
    return _XtCalloc(num, size, (char *)NULL, 0);
}

Boolean _XtIsValidPointer(
    char *ptr)
{
    register StatsPtr mem;
    register StatsPtr stp = ToStats(ptr);

    LOCK_PROCESS;
    for (mem = XtMemory; mem; mem = mem->next) {
	if (mem == stp) {
	    UNLOCK_PROCESS;
	    return True;
	}
    }
    UNLOCK_PROCESS;
    return False;
}

Boolean _XtValidateMemory = False;

void _XtFree(
    char *ptr)
{
   register StatsPtr stp;

   LOCK_PROCESS;
   if (ptr) {
       if (_XtValidateMemory && !_XtIsValidPointer(ptr))
	   abort();
       stp = ToStats(ptr);
       if (stp->file)
	   ActiveXtMemory -= stp->size;
       if (stp->prev)
	   stp->prev->next = stp->next;
       else
	   XtMemory = stp->next;
       if (stp->next)
	   stp->next->prev = stp->prev;
       Xfree((char *)stp);
   }
   UNLOCK_PROCESS;
}

void XtFree(char *ptr)
{
   _XtFree(ptr);
}

char *_XtHeapMalloc(
    Heap *heap,
    Cardinal size,
    char *file,
    int line)
{
    StatsPtr ptr;
    unsigned newsize;
    XtPointer hp = (XtPointer) heap;
    char* retval = NULL;

    LOCK_PROCESS;
    newsize = StatsSize(size);
    if ((ptr = (StatsPtr)Xmalloc(newsize)) == NULL)
        _XtAllocError("malloc");
    CHAIN(ptr, size, hp);
    retval = (ToMem(ptr));
    UNLOCK_PROCESS;
    return retval;
}

void _XtHeapFree(register XtPointer heap)
{
    register StatsPtr mem, next;

    LOCK_PROCESS;
    for (mem = XtMemory; mem; mem = next) {
	next = mem->next;
	if (mem->heap == heap) {
	    if (mem->file)
		ActiveXtMemory -= mem->size;
	    if (mem->prev)
		mem->prev->next = next;
	    else
		XtMemory = next;
	    if (next)
		next->prev = mem->prev;
	    Xfree((char *)mem);
	}
    }
    UNLOCK_PROCESS;
}

#include <stdio.h>

void _XtPrintMemory(char * filename)
{
    register StatsPtr mem;
    FILE *f;

    if (filename == NULL)
	f = stderr;
    else
	f = fopen(filename, "w");
    LOCK_PROCESS;
    fprintf(f, "total size: %d\n", ActiveXtMemory);
    for (mem = XtMemory; mem; mem = mem->next) {
	if (mem->file)
	    fprintf(f, "size: %6d  seq: %5d  %12s(%4d)  %s\n",
		    mem->size, mem->seq,
		    mem->file, mem->line, mem->heap ? "heap" : "");
    }
    UNLOCK_PROCESS;
    if (filename) fclose(f);
}

#endif  /* XTTRACEMEMORY */