new files to monitor memory usage

1 files changed, 248 insertions, 0 deletions

diff --git a/src/mem.c b/src/mem.c
new file mode 100644
index 0000000..4b1a467
--- /dev/null
+++ b/src/mem.c
@@ -0,0 +1,248 @@
+/*	$calcurse: mem.c,v 1.1 2008/12/28 13:15:18 culot Exp $	*/
+
+/*
+ * Calcurse - text-based organizer
+ * Copyright (c) 2008 Frederic Culot
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Send your feedback or comments to : calcurse@culot.org
+ * Calcurse home page : http://culot.org/calcurse
+ *
+ */
+
+#include <string.h>
+#include <stdio.h>
+
+#include "i18n.h"
+#include "utils.h"
+#include "mem.h"
+
+enum {
+  BLK_STATE,
+  BLK_SIZE,
+  BLK_ID,
+  EXTRA_SPACE_START
+};
+
+#define EXTRA_SPACE_END    1
+#define EXTRA_SPACE        EXTRA_SPACE_START + EXTRA_SPACE_END
+
+#define MAGIC_ALLOC        0xda
+#define MAGIC_FREE         0xdf
+
+struct mem_blk_s {
+  unsigned id, size;
+  const char *pos;
+  struct mem_blk_s *next;
+};
+
+typedef struct {
+  unsigned ncall, nalloc, nfree;
+  struct mem_blk_s *blk;
+} mem_stats_t;
+
+static mem_stats_t mstats;
+
+
+unsigned
+stats_add_blk (size_t size, const char *pos)
+{
+  struct mem_blk_s *o, **i;
+
+  o = malloc (sizeof (struct mem_blk_s));
+  EXIT_IF (o == 0, _("could not allocate memory to store block info"));
+
+  mstats.ncall++;
+  
+  o->pos = pos;
+  o->size = (unsigned)size;
+  o->next = 0;
+  
+  i = &mstats.blk;
+  for (i = &mstats.blk; *i; i = &(*i)->next)
+    ;
+  o->id = mstats.ncall;
+  *i = o;
+
+  return o->id;
+}
+
+void
+stats_del_blk (unsigned id)
+{
+  struct mem_blk_s *o, **i;
+
+  EXIT_IF (id < 0, _("Incorrect block id"));
+
+  i = &mstats.blk;
+  for (o = mstats.blk; o; o = o->next)
+    {
+      if (o->id == id)
+        {
+          *i = o->next;
+          free (o);
+          return;
+        }
+      i = &o->next;
+    }
+
+  EXIT (_("Block not found"));
+  /* NOTREACHED */  
+}
+
+void *
+dbg_malloc (size_t size, const char *pos)
+{
+  unsigned *buf;
+  
+  if (size == 0)
+    return (void *)0;
+  
+  size = EXTRA_SPACE + (size + sizeof (unsigned) - 1) / sizeof (unsigned);
+  if ((buf = (unsigned *)malloc (size * sizeof (unsigned))) == 0)
+    return (void *)0;
+  
+  buf[BLK_STATE] = MAGIC_ALLOC;             /* state of the block */
+  buf[BLK_SIZE] = size;                     /* size of the block */
+  buf[BLK_ID] = stats_add_blk (size, pos);  /* identify a block by its id */
+  buf[size - 1] = buf[BLK_ID];              /* mark at end of block */
+
+  mstats.nalloc += size;
+
+  return (void *)(buf + EXTRA_SPACE_START);
+}
+
+void *
+dbg_calloc (size_t nmemb, size_t size, const char *pos)
+{
+  void *buf;
+  
+  if (!nmemb || !size)
+    return (void *)0;
+  
+  EXIT_IF (nmemb > SIZE_MAX / size, _("overflow at %s"), pos);
+
+  size *= nmemb;
+  if ((buf = dbg_malloc (size, pos)) == 0)
+    return (void *)0;
+
+  bzero (buf, size);
+
+  return buf;
+}
+
+void *
+dbg_realloc (void *ptr, size_t size, const char *pos)
+{
+  unsigned *buf, old_size;
+  
+  if (size == 0 || ptr == 0)
+    return (void *)0;
+  
+  if ((buf = dbg_malloc (size, pos)) == 0)
+    return (void *)0;
+
+  old_size = *((unsigned *)ptr - EXTRA_SPACE_START + BLK_SIZE);
+  bcopy (ptr, buf + EXTRA_SPACE_START, old_size);
+  mem_free (ptr);
+  
+  mstats.nalloc += size;
+
+  return (void *)(buf + EXTRA_SPACE_START);
+}
+
+char *
+dbg_strdup (const char *s, const char *pos)
+{
+  size_t size;
+  char *buf;
+  
+  if (s == 0)
+    return (char *)0;
+
+  size = strlen (s);
+  if ((buf = dbg_malloc (size + 1, pos)) == 0)
+    return (char *)0;
+
+  return strncpy (buf, s, size + 1);
+}
+
+void
+dbg_free (void *ptr, const char *pos)
+{
+  unsigned *buf, size;
+
+  if (ptr == 0)
+    return;
+
+  buf = (unsigned *)ptr - EXTRA_SPACE_START;
+  size = buf[BLK_SIZE];
+  
+  EXIT_IF (buf[BLK_STATE] == MAGIC_FREE,
+           _("block seems already freed at %s"), pos);
+  EXIT_IF (buf[BLK_STATE] != MAGIC_ALLOC,
+           _("corrupt block header at %s"), pos);
+  EXIT_IF (buf[size - 1] != buf[BLK_ID],
+           _("corrupt block end at %s, (end = %u, should be %d)"), pos,
+           buf[size - 1], buf[BLK_ID]); 
+
+  buf[0] = MAGIC_FREE;
+
+  stats_del_blk (buf[BLK_ID]);
+  
+  free (buf);
+  mstats.nfree += size;
+}
+
+
+#ifdef CALCURSE_MEMORY_DEBUG
+
+static void
+dump_block_info (struct mem_blk_s *blk)
+{
+  if (blk == 0)
+    return;
+  
+  printf (_("---==== MEMORY BLOCK ====----------------\n"));
+  printf (_("            id: %u\n"), blk->id);    
+  printf (_("          size: %u\n"), blk->size);  
+  printf (_("  allocated in: %s\n"), blk->pos);
+  printf (_("-----------------------------------------\n"));
+}
+
+void
+mem_stats (void)
+{
+  printf ("\n");
+  printf (_("+------------------------------+\n"));  
+  printf (_("| calcurse memory usage report |\n"));
+  printf (_("+------------------------------+\n"));
+  printf (_("  number of calls: %u\n"), mstats.ncall);
+  printf (_(" allocated blocks: %u\n"), mstats.nalloc);
+  printf (_("   unfreed blocks: %u\n"), mstats.nalloc - mstats.nfree);
+  printf ("\n");
+
+  if (mstats.nfree < mstats.nalloc)
+    {
+      struct mem_blk_s *blk;
+
+      for (blk = mstats.blk; blk; blk = blk->next)
+        dump_block_info (blk);
+    }
+}
+
+#endif /* CALCURSE_MEMORY_DEBUG */