From 5bcfe0c700c1001b7e94e76214be12249bc051c7 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 6 Jan 2010 12:42:35 -0200
Subject: [PATCH] new debug info 'isvararg' and 'nparams'

---
 ldblib.c | 19 +++++++++++++------
 ldebug.c | 10 +++++++++-
 lua.h    |  4 +++-
 3 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/ldblib.c b/ldblib.c
index ce14d7dc..be132a3f 100644
--- a/ldblib.c
+++ b/ldblib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.117 2009/11/24 12:05:44 roberto Exp roberto $
+** $Id: ldblib.c,v 1.118 2009/11/25 15:27:51 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -73,6 +73,12 @@ static void settabsi (lua_State *L, const char *i, int v) {
 }
 
 
+static void settabsb (lua_State *L, const char *i, int v) {
+  lua_pushboolean(L, v);
+  lua_setfield(L, -2, i);
+}
+
+
 static lua_State *getthread (lua_State *L, int *arg) {
   if (lua_isthread(L, 1)) {
     *arg = 1;
@@ -127,16 +133,17 @@ static int db_getinfo (lua_State *L) {
   }
   if (strchr(options, 'l'))
     settabsi(L, "currentline", ar.currentline);
-  if (strchr(options, 'u'))
+  if (strchr(options, 'u')) {
     settabsi(L, "nups", ar.nups);
+    settabsi(L, "nparams", ar.nparams);
+    settabsb(L, "isvararg", ar.isvararg);
+  }
   if (strchr(options, 'n')) {
     settabss(L, "name", ar.name);
     settabss(L, "namewhat", ar.namewhat);
   }
-  if (strchr(options, 't')) {
-    lua_pushboolean(L, ar.istailcall);
-    lua_setfield(L, -2, "istailcall");
-  }
+  if (strchr(options, 't'))
+    settabsb(L, "istailcall", ar.istailcall);
   if (strchr(options, 'L'))
     treatstackoption(L, L1, "activelines");
   if (strchr(options, 'f'))
diff --git a/ldebug.c b/ldebug.c
index 76afe3c3..9b1a303c 100644
--- a/ldebug.c
+++ b/ldebug.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.59 2009/11/26 15:34:15 roberto Exp roberto $
+** $Id: ldebug.c,v 2.60 2009/12/01 16:31:04 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -192,6 +192,14 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
       }
       case 'u': {
         ar->nups = f->c.nupvalues;
+        if (f->c.isC) {
+          ar->isvararg = 1;
+          ar->nparams = 0;
+        }
+        else {
+          ar->isvararg = f->l.p->is_vararg;
+          ar->nparams = f->l.p->numparams;
+        }
         break;
       }
       case 't': {
diff --git a/lua.h b/lua.h
index fd13b510..0704ea71 100644
--- a/lua.h
+++ b/lua.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.257 2009/12/22 16:47:00 roberto Exp roberto $
+** $Id: lua.h,v 1.258 2010/01/05 18:33:26 roberto Exp roberto $
 ** Lua - A Scripting Language
 ** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
@@ -407,6 +407,8 @@ struct lua_Debug {
   int linedefined;	/* (S) */
   int lastlinedefined;	/* (S) */
   unsigned char nups;	/* (u) number of upvalues */
+  unsigned char nparams;/* (u) number of parameters */
+  char isvararg;        /* (u) */
   char istailcall;	/* (t) */
   char short_src[LUA_IDSIZE]; /* (S) */
   /* private part */