From a8a15ff1bdcb7526625b717c64c1d286f0625dd2 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 3 Mar 1997 16:55:38 -0300
Subject: [PATCH] "mem.c.debug" incorporated (with "#if").

---
 luamem.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 102 insertions(+), 1 deletion(-)

diff --git a/luamem.c b/luamem.c
index db67fb87..be08b608 100644
--- a/luamem.c
+++ b/luamem.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
 
-char *rcs_mem = "$Id: mem.c,v 1.12 1996/05/06 16:59:00 roberto Exp roberto $";
+char *rcs_mem = "$Id: mem.c,v 1.14 1997/02/25 11:12:28 roberto Exp roberto $";
 
 #include <stdlib.h>
 
@@ -11,6 +11,10 @@ char *rcs_mem = "$Id: mem.c,v 1.12 1996/05/06 16:59:00 roberto Exp roberto $";
 #include "lua.h"
 
 
+#define DEBUG 0
+
+#if !DEBUG
+
 void luaI_free (void *block)
 {
   if (block)
@@ -56,3 +60,100 @@ void* luaI_buffer (unsigned long size)
   return buffer;
 }
 
+#else
+/* DEBUG */
+
+#include <stdio.h>
+
+# define assert(ex)    {if (!(ex)){(void)fprintf(stderr, \
+    "Assertion failed: file \"%s\", line %d\n", __FILE__, __LINE__);exit(1);}}
+
+#define MARK    55
+
+static unsigned long numblocks = 0;
+static unsigned long totalmem = 0;
+
+
+static void message (void)
+{
+#define inrange(x,y)   ((x) < (((y)*3)/2)  && (x) > (((y)*2)/3))
+  static int count = 0;
+  static unsigned long lastnumblocks = 0;
+  static unsigned long lasttotalmem = 0;
+  if (!inrange(numblocks, lastnumblocks) || !inrange(totalmem, lasttotalmem)
+       || count++ >= 5000)
+  {
+    fprintf(stderr,"blocks = %lu  mem = %luK\n", numblocks, totalmem/1000);
+    count = 0;
+    lastnumblocks = numblocks;
+    lasttotalmem = totalmem;
+  }
+}
+
+
+void luaI_free (void *block)
+{
+  if (block)
+  {
+    unsigned long *b = (unsigned long *)block - 1;
+    unsigned long size = *b;
+    assert(*(((char *)b)+size+sizeof(unsigned long)) == MARK);
+    numblocks--;
+    totalmem -= size;
+    free(b);
+    message();
+  }
+}
+
+
+void *luaI_realloc (void *oldblock, unsigned long size)
+{
+  unsigned long *block;
+  unsigned long realsize = sizeof(unsigned long)+size+sizeof(char);
+  if (realsize != (size_t)realsize)
+    lua_error("Allocation Error: Block too big");
+  if (oldblock)
+  {
+    unsigned long *b = (unsigned long *)oldblock - 1;
+    unsigned long oldsize = *b;
+    assert(*(((char *)b)+oldsize+sizeof(unsigned long)) == MARK);
+    totalmem -= oldsize;
+    numblocks--;
+    block = (unsigned long *)realloc(b, realsize);
+  }
+  else
+    block = (unsigned long *)malloc(realsize);
+  if (block == NULL)
+    lua_error("not enough memory");
+  totalmem += size;
+  numblocks++;
+  *block = size;
+  *(((char *)block)+size+sizeof(unsigned long)) = MARK;
+  message();
+  return block+1;
+}
+
+
+int luaI_growvector (void **block, unsigned long nelems, int size,
+                       char *errormsg, unsigned long limit)
+{
+  if (nelems >= limit)
+    lua_error(errormsg);
+  nelems = (nelems == 0) ? 20 : nelems*2;
+  if (nelems > limit)
+    nelems = limit;
+  *block = luaI_realloc(*block, nelems*size);
+  return (int)nelems;
+}
+
+
+void* luaI_buffer (unsigned long size)
+{
+  static unsigned long buffsize = 0;
+  static char* buffer = NULL;
+  if (size > buffsize)
+    buffer = luaI_realloc(buffer, buffsize=size);
+  return buffer;
+}
+
+#endif