From 6b8cdc9cdd545508af85d1de2013ea0fc64792b0 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 11 Jun 2002 13:26:12 -0300
Subject: Lua now uses only `realloc' for all its memory management

---
 lmem.c   | 15 +++++++++++----
 ltests.c |  7 +++++--
 ltests.h |  4 +---
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/lmem.c b/lmem.c
index 99b0dafc..00c7253b 100644
--- a/lmem.c
+++ b/lmem.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmem.c,v 1.54 2002/05/01 20:40:42 roberto Exp roberto $
+** $Id: lmem.c,v 1.55 2002/05/15 18:57:44 roberto Exp roberto $
 ** Interface to Memory Manager
 ** See Copyright Notice in lua.h
 */
@@ -17,9 +17,14 @@
 
 
 
+/*
+** definition for realloc function. It must assure that
+** l_realloc(block, x, 0) frees the block, and l_realloc(NULL, 0, x)
+** allocates a new block (ANSI C assures that).
+** (`os' is the old block size; some allocators may use that.)
+*/
 #ifndef l_realloc
 #define l_realloc(b,os,s)	realloc(b,s)
-#define l_free(b,s)		free(b)
 #endif
 
 
@@ -50,8 +55,10 @@ void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
 */
 void *luaM_realloc (lua_State *L, void *block, lu_mem oldsize, lu_mem size) {
   if (size == 0) {
-    l_free(block, oldsize);  /* block may be NULL; that is OK for free */
-    block = NULL;
+    if (block != NULL) {
+      l_realloc(block, oldsize, size);
+      block = NULL;
+    }
   }
   else if (size >= MAX_SIZET)
     luaG_runerror(L, "memory allocation error: block too big");
diff --git a/ltests.c b/ltests.c
index c348a87c..bf7c19b3 100644
--- a/ltests.c
+++ b/ltests.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.c,v 1.122 2002/05/16 14:59:49 roberto Exp roberto $
+** $Id: ltests.c,v 1.123 2002/06/03 20:11:41 roberto Exp roberto $
 ** Internal Module for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
@@ -96,7 +96,10 @@ static void freeblock (void *block) {
 
 
 void *debug_realloc (void *block, size_t oldsize, size_t size) {
-  lua_assert((oldsize == 0) ? block == NULL : oldsize == *blocksize(block));
+  lua_assert((oldsize == 0) == (block == NULL));
+  lua_assert(oldsize == 0 || oldsize == *blocksize(block));
+  /* ISO does not specify what realloc(NULL, 0) does */
+  lua_assert(block != NULL || size > 0);
   if (size == 0) {
     freeblock(block);
     return NULL;
diff --git a/ltests.h b/ltests.h
index 28604c60..6aef3984 100644
--- a/ltests.h
+++ b/ltests.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.h,v 1.11 2002/01/11 20:23:57 roberto Exp roberto $
+** $Id: ltests.h,v 1.12 2002/03/08 19:17:59 roberto Exp roberto $
 ** Internal Header for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
@@ -32,9 +32,7 @@ extern unsigned long memdebug_maxmem;
 extern unsigned long memdebug_memlimit;
 
 
-#define l_malloc(s)		debug_realloc(NULL, 0, s)
 #define l_realloc(b, os, s)	debug_realloc(b, os, s)
-#define l_free(b, s)		debug_realloc(b, s, 0)
 
 void *debug_realloc (void *block, size_t oldsize, size_t size);
 
-- 
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