From f0dffaa209d80b9852e873830243245c1facdd05 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 12 Jan 1998 11:35:37 -0200
Subject: new way to hanlde arg information

---
 lopcodes.h | 13 ++++---------
 lua.stx    | 15 ++++++++++-----
 lvm.c      | 22 +++++++---------------
 3 files changed, 21 insertions(+), 29 deletions(-)

diff --git a/lopcodes.h b/lopcodes.h
index 3f25e828..ee0f9354 100644
--- a/lopcodes.h
+++ b/lopcodes.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.13 1997/12/29 17:35:46 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.14 1997/12/30 19:08:23 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -169,19 +169,14 @@ SETLINEW,/*	w	-		-		LINE=w  */
 
 POP,/*		b	-		-		TOP-=(b+1)  */
 POP0,/*		-	-		-		TOP-=1  */
-POP1,/*		-	-		-		TOP-=2  */
-
-ARGS,/*		b	-		-		TOP=BASE+b  */
-ARGS0,/*	-	-		-		TOP=BASE+0  */
-ARGS1,/*	-	-		-		TOP=BASE+1  */
-ARGS2,/*	-	-		-		TOP=BASE+2  */
-ARGS3,/*	-	-		-		TOP=BASE+3  */
-VARARGS/*	b	v_x...v_1	{v_1...v_x;n=x}	TOP=BASE+b+1  */
+POP1/*		-	-		-		TOP-=2  */
+
 } OpCode;
 
 
 #define RFIELDS_PER_FLUSH 32	/* records (SETMAP) */
 #define LFIELDS_PER_FLUSH 64    /* lists (SETLIST) */
 
+#define ZEROVARARG	64
 
 #endif
diff --git a/lua.stx b/lua.stx
index b10ea3bb..0208a638 100644
--- a/lua.stx
+++ b/lua.stx
@@ -1,6 +1,6 @@
 %{
 /*
-** $Id: lua.stx,v 1.31 1997/12/30 19:08:23 roberto Exp roberto $
+** $Id: lua.stx,v 1.32 1998/01/12 13:00:51 roberto Exp roberto $
 ** Syntax analizer and code generator
 ** See Copyright Notice in lua.h
 */
@@ -448,11 +448,15 @@ static void adjust_mult_assign (int vars, long exps)
 
 static void code_args (int nparams, int dots)
 {
-  L->currState->nlocalvar += nparams;
-  if (!dots)
-    code_oparg(ARGS, 4, L->currState->nlocalvar, L->currState->nlocalvar);
+  L->currState->nlocalvar += nparams;  /* "self" may already be there */
+  nparams = L->currState->nlocalvar;
+  if (!dots) {
+    L->currState->f->code[1] = nparams;  /* fill-in arg information */
+    deltastack(nparams);
+  }
   else {
-    code_oparg(VARARGS, 0, L->currState->nlocalvar, L->currState->nlocalvar+1);
+    L->currState->f->code[1] = nparams+ZEROVARARG;
+    deltastack(nparams+1);
     add_localvar(luaS_new("arg"));
   }
 }
@@ -577,6 +581,7 @@ static void init_state (TaggedString *filename)
   else
     fs->maxvars = -1;  /* flag no debug information */
   code_byte(0);  /* to be filled with stacksize */
+  code_byte(0);  /* to be filled with arg information */
   L->lexstate->lastline = 0;  /* invalidate it */
 }
 
diff --git a/lvm.c b/lvm.c
index 0fcaff2c..3140b4e4 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 1.20 1997/12/29 17:35:46 roberto Exp roberto $
+** $Id: lvm.c,v 1.21 1997/12/30 19:08:23 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -289,6 +289,12 @@ StkId luaV_execute (Closure *cl, TProtoFunc *tf, StkId base)
   if (lua_callhook)
     luaD_callHook(base, tf, 0);
   luaD_checkstack((*pc++)+EXTRA_STACK);
+  if (*pc < ZEROVARARG)
+    luaD_adjusttop(base+*(pc++));
+  else {  /* varargs */
+    luaC_checkGC();
+    adjust_varargs(base+(*pc++)-ZEROVARARG);
+  }
   while (1) {
     int aux;
     switch ((OpCode)(aux = *pc++)) {
@@ -473,20 +479,6 @@ StkId luaV_execute (Closure *cl, TProtoFunc *tf, StkId base)
         S->top -= (aux+1);
         break;
 
-      case ARGS:
-        aux = *pc++; goto args;
-
-      case ARGS0: case ARGS1: case ARGS2: case ARGS3:
-        aux -= ARGS0;
-      args:
-        luaD_adjusttop(base+aux);
-        break;
-
-      case VARARGS:
-        luaC_checkGC();
-        adjust_varargs(base+(*pc++));
-        break;
-
       case CREATEARRAYW:
         aux = next_word(pc); goto createarray;
 
-- 
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