From 73517e86b02b47531bec189d4230e359274d8d04 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 11 Dec 2002 10:34:22 -0200
Subject: [PATCH] OP_TFORLOOP uses extra stack space

---
 lcode.c   | 4 ++--
 lcode.h   | 3 ++-
 ldebug.c  | 4 ++--
 lparser.c | 3 ++-
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/lcode.c b/lcode.c
index 3e22de75..0d96f632 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 1.113 2002/11/14 16:15:53 roberto Exp roberto $
+** $Id: lcode.c,v 1.114 2002/12/04 17:38:31 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -176,7 +176,7 @@ void luaK_concat (FuncState *fs, int *l1, int l2) {
 }
 
 
-static void luaK_checkstack (FuncState *fs, int n) {
+void luaK_checkstack (FuncState *fs, int n) {
   int newstack = fs->freereg + n;
   if (newstack > fs->f->maxstacksize) {
     if (newstack >= MAXSTACK)
diff --git a/lcode.h b/lcode.h
index 3c5da39a..8a0eece9 100644
--- a/lcode.h
+++ b/lcode.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.h,v 1.36 2002/05/13 13:07:48 roberto Exp roberto $
+** $Id: lcode.h,v 1.37 2002/06/12 19:16:00 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -47,6 +47,7 @@ int luaK_codeABC (FuncState *fs, OpCode o, int A, int B, int C);
 void luaK_fixline (FuncState *fs, int line);
 void luaK_nil (FuncState *fs, int from, int n);
 void luaK_reserveregs (FuncState *fs, int n);
+void luaK_checkstack (FuncState *fs, int n);
 int luaK_stringK (FuncState *fs, TString *s);
 int luaK_numberK (FuncState *fs, lua_Number r);
 void luaK_dischargevars (FuncState *fs, expdesc *e);
diff --git a/ldebug.c b/ldebug.c
index 9f170c6b..bf58d0a8 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 1.141 2002/12/04 17:38:31 roberto Exp roberto $
+** $Id: ldebug.c,v 1.142 2002/12/06 17:15:35 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -364,7 +364,7 @@ static Instruction luaG_symbexec (const Proto *pt, int lastpc, int reg) {
         break;
       }
       case OP_TFORLOOP:
-        checkreg(pt, a+2+c);
+        checkreg(pt, a+c+5);
         if (reg >= a) last = pc;  /* affect all registers above base */
         /* go through */
       case OP_FORLOOP:
diff --git a/lparser.c b/lparser.c
index ef1a1b03..e016b835 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 1.200 2002/12/04 17:38:31 roberto Exp roberto $
+** $Id: lparser.c,v 1.201 2002/12/06 17:09:00 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -1070,6 +1070,7 @@ static void forlist (LexState *ls, TString *indexname) {
   check(ls, TK_IN);
   line = ls->linenumber;
   adjust_assign(ls, nvars, explist1(ls, &e), &e);
+  luaK_checkstack(fs, 3);  /* extra space to call generator */
   luaK_codeAsBx(fs, OP_TFORPREP, base, NO_JUMP);
   forbody(ls, base, line, nvars, 0);
 }