1 files changed, 150 insertions, 0 deletions
diff --git a/src/lua/lmem.c b/src/lua/lmem.c
new file mode 100644
index 00000000..8fdecef3
--- /dev/null
+++ b/src/lua/lmem.c
@@ -0,0 +1,150 @@
+/*
+** $Id: lmem.c,v 1.3 2001/11/26 23:00:24 darkgod Exp $
+** Interface to Memory Manager
+** See Copyright Notice in lua.h
+*/
+
+
+#include <stdlib.h>
+
+#include "lua.h"
+
+#include "ldo.h"
+#include "lmem.h"
+#include "lobject.h"
+#include "lstate.h"
+
+
+
+
+#ifdef LUA_DEBUG
+/*
+** {======================================================================
+** Controlled version for realloc.
+** =======================================================================
+*/
+
+
+#include <assert.h>
+#include <limits.h>
+#include <string.h>
+
+#define realloc(b, s)	debug_realloc(b, s)
+#define malloc(b)	debug_realloc(NULL, b)
+#define free(b)		debug_realloc(b, 0)
+
+
+/* ensures maximum alignment for HEADER */
+#define HEADER	(sizeof(union L_Umaxalign))
+
+#define MARKSIZE	16
+#define MARK		0x55  /* 01010101 (a nice pattern) */
+
+
+#define blocksize(b)	((unsigned long *)((char *)(b) - HEADER))
+
+unsigned long memdebug_numblocks = 0;
+unsigned long memdebug_total = 0;
+unsigned long memdebug_maxmem = 0;
+unsigned long memdebug_memlimit = LONG_MAX;
+
+
+static void *checkblock (void *block) {
+  unsigned long *b = blocksize(block);
+  unsigned long size = *b;
+  int i;
+  for (i=0;i<MARKSIZE;i++)
+    assert(*(((char *)b)+HEADER+size+i) == MARK+i);  /* corrupted block? */
+  memdebug_numblocks--;
+  memdebug_total -= size;
+  return b;
+}
+
+
+static void freeblock (void *block) {
+  if (block) {
+    size_t size = *blocksize(block);
+    block = checkblock(block);
+    memset(block, -1, size+HEADER+MARKSIZE);  /* erase block */
+    (free)(block);  /* free original block */
+  }
+}
+
+
+static void *debug_realloc (void *block, size_t size) {
+  if (size == 0) {
+    freeblock(block);
+    return NULL;
+  }
+  else if (memdebug_total+size > memdebug_memlimit)
+    return NULL;  /* to test memory allocation errors */
+  else {
+    size_t realsize = HEADER+size+MARKSIZE;
+    char *newblock = (char *)(malloc)(realsize);  /* alloc a new block */
+    int i;
+    if (realsize < size) return NULL;  /* overflow! */
+    if (newblock == NULL) return NULL;
+    if (block) {
+      size_t oldsize = *blocksize(block);
+      if (oldsize > size) oldsize = size;
+      memcpy(newblock+HEADER, block, oldsize);
+      freeblock(block);  /* erase (and check) old copy */
+    }
+    memdebug_total += size;
+    if (memdebug_total > memdebug_maxmem) memdebug_maxmem = memdebug_total;
+    memdebug_numblocks++;
+    *(unsigned long *)newblock = size;
+    for (i=0;i<MARKSIZE;i++)
+      *(newblock+HEADER+size+i) = (char)(MARK+i);
+    return newblock+HEADER;
+  }
+}
+
+
+/* }====================================================================== */
+#endif
+
+
+
+/*
+** Real ISO (ANSI) systems do not need these tests;
+** but some systems (Sun OS) are not that ISO...
+*/
+#ifdef OLD_ANSI
+#define realloc(b,s)	((b) == NULL ? malloc(s) : (realloc)(b, s))
+#define free(b)		if (b) (free)(b)
+#endif
+
+
+void *luaM_growaux (lua_State *L, void *block, size_t nelems,
+               int inc, size_t size, const char *errormsg, size_t limit) {
+  size_t newn = nelems+inc;
+  if (nelems >= limit-inc) lua_error(L, errormsg);
+  if ((newn ^ nelems) <= nelems ||  /* still the same power-of-2 limit? */
+       (nelems > 0 && newn < MINPOWER2))  /* or block already is MINPOWER2? */
+      return block;  /* do not need to reallocate */
+  else  /* it crossed a power-of-2 boundary; grow to next power */
+    return luaM_realloc(L, block, luaO_power2(newn)*size);
+}
+
+
+/*
+** generic allocation routine.
+*/
+void *luaM_realloc (lua_State *L, void *block, lint32 size) {
+  if (size == 0) {
+    free(block);  /* block may be NULL; that is OK for free */
+    return NULL;
+  }
+  else if (size >= MAX_SIZET)
+    lua_error(L, "memory allocation error: block too big");
+  block = realloc(block, size);
+  if (block == NULL) {
+    if (L)
+      luaD_breakrun(L, LUA_ERRMEM);  /* break run without error message */
+    else return NULL;  /* error before creating state! */
+  }
+  return block;
+}
+
+