From bf2b342ac1f080d06977bdf84475dc663c9a2644 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 13 Jun 2005 11:15:54 -0300
Subject: better control for compatibility code for varargs

---
 lparser.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'lparser.c')

diff --git a/lparser.c b/lparser.c
index 9d855a5e..6b7097a6 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.27 2005/05/17 19:49:15 roberto Exp roberto $
+** $Id: lparser.c,v 2.28 2005/05/20 15:53:42 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -402,7 +402,7 @@ Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name) {
   lexstate.buff = buff;
   luaX_setinput(L, &lexstate, z, luaS_new(L, name));
   open_func(&lexstate, &funcstate);
-  funcstate.f->is_vararg = NEWSTYLEVARARG;
+  funcstate.f->is_vararg = VARARG_ISVARARG;  /* main func. is always vararg */
   next(&lexstate);  /* read first token */
   chunk(&lexstate);
   check(&lexstate, TK_EOS);
@@ -572,9 +572,12 @@ static void parlist (LexState *ls) {
         }
         case TK_DOTS: {  /* param -> `...' */
           next(ls);
+#if defined(LUA_COMPAT_VARARG)
           /* use `arg' as default name */
           new_localvarliteral(ls, "arg", nparams++);
-          f->is_vararg = 1;
+          f->is_vararg = VARARG_HASARG | VARARG_NEEDSARG;
+#endif
+          f->is_vararg |= VARARG_ISVARARG;
           break;
         }
         default: luaX_syntaxerror(ls, "<name> or " LUA_QL("...") " expected");
@@ -582,7 +585,7 @@ static void parlist (LexState *ls) {
     } while (!f->is_vararg && testnext(ls, ','));
   }
   adjustlocalvars(ls, nparams);
-  f->numparams = fs->nactvar - f->is_vararg;
+  f->numparams = fs->nactvar - (f->is_vararg & VARARG_HASARG);
   luaK_reserveregs(fs, fs->nactvar);  /* reserve register for parameters */
 }
 
@@ -766,7 +769,7 @@ static void simpleexp (LexState *ls, expdesc *v) {
       FuncState *fs = ls->fs;
       check_condition(ls, fs->f->is_vararg,
                       "cannot use " LUA_QL("...") " outside a vararg function");
-      fs->f->is_vararg = NEWSTYLEVARARG;
+      fs->f->is_vararg &= ~VARARG_NEEDSARG;  /* don't need 'arg' */
       init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 1, 0));
       break;
     }
-- 
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