From 265530478bf4db5c1404a60acede1befb7fc48f8 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 9 Jul 2003 17:11:30 -0300
Subject: [PATCH] more changes to reduce stack usage by the parser

---
 lparser.c | 12 +++++++-----
 lparser.h |  8 ++++----
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/lparser.c b/lparser.c
index 2d482489..8ca5d8d5 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 1.211 2003/05/14 21:02:39 roberto Exp roberto $
+** $Id: lparser.c,v 1.212 2003/07/09 15:36:38 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -139,7 +139,7 @@ static int luaI_registerlocalvar (LexState *ls, TString *varname) {
   FuncState *fs = ls->fs;
   Proto *f = fs->f;
   luaM_growvector(ls->L, f->locvars, fs->nlocvars, f->sizelocvars,
-                  LocVar, MAX_INT, "");
+                  LocVar, USHRT_MAX, "too many local variables");
   f->locvars[fs->nlocvars].varname = varname;
   return fs->nlocvars++;
 }
@@ -148,7 +148,8 @@ static int luaI_registerlocalvar (LexState *ls, TString *varname) {
 static void new_localvar (LexState *ls, TString *name, int n) {
   FuncState *fs = ls->fs;
   luaX_checklimit(ls, fs->nactvar+n+1, MAXVARS, "local variables");
-  fs->actvar[fs->nactvar+n] = luaI_registerlocalvar(ls, name);
+  fs->actvar[fs->nactvar+n] = cast(unsigned short,
+                                   luaI_registerlocalvar(ls, name));
 }
 
 
@@ -187,8 +188,9 @@ static int indexupvalue (FuncState *fs, TString *name, expdesc *v) {
   luaM_growvector(fs->L, fs->f->upvalues, f->nups, fs->f->sizeupvalues,
                   TString *, MAX_INT, "");
   fs->f->upvalues[f->nups] = name;
-  fs->upvalues[f->nups].k = v->k;
-  fs->upvalues[f->nups].info = v->info;
+  lua_assert(v->k == VLOCAL || v->k == VUPVAL);
+  fs->upvalues[f->nups].k = cast(lu_byte, v->k);
+  fs->upvalues[f->nups].info = cast(lu_byte, v->info);
   return f->nups++;
 }
 
diff --git a/lparser.h b/lparser.h
index 7c052f08..1cb52623 100644
--- a/lparser.h
+++ b/lparser.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.h,v 1.47 2003/02/11 10:46:24 roberto Exp roberto $
+** $Id: lparser.h,v 1.48 2003/07/09 15:36:38 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -42,8 +42,8 @@ typedef struct expdesc {
 
 
 typedef struct upvaldesc {
-  expkind k;
-  int info;
+  lu_byte k;
+  lu_byte info;
 } upvaldesc;
 
 
@@ -67,7 +67,7 @@ typedef struct FuncState {
   int nlocvars;  /* number of elements in `locvars' */
   lu_byte nactvar;  /* number of active local variables */
   upvaldesc upvalues[MAXUPVALUES];  /* upvalues */
-  int actvar[MAXVARS];  /* declared-variable stack */
+  unsigned short actvar[MAXVARS];  /* declared-variable stack */
 } FuncState;