From 609392ff2e02eb44fa48c8563faf5994fc55297c Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 21 Nov 1994 16:22:58 -0200
Subject: [PATCH] fallback for "call expression not a function" errors

---
 fallback.c | 11 +++++++++--
 fallback.h |  3 ++-
 opcode.c   | 22 ++++++++++++++++++----
 3 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/fallback.c b/fallback.c
index a41712cc..0076da24 100644
--- a/fallback.c
+++ b/fallback.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
  
-char *rcs_fallback="$Id: fallback.c,v 1.7 1994/11/18 19:46:21 roberto Exp roberto $";
+char *rcs_fallback="$Id: fallback.c,v 1.8 1994/11/21 13:30:15 roberto Exp roberto $";
 
 #include <stdio.h>
  
@@ -21,6 +21,7 @@ static void arithFB (void);
 static void concatFB (void);
 static void orderFB (void);
 static void GDFB (void);
+static void funcFB (void);
 
 
 /*
@@ -34,7 +35,8 @@ struct FB  luaI_fallBacks[] = {
 {"order", {LUA_T_CFUNCTION, orderFB}},
 {"concat", {LUA_T_CFUNCTION, concatFB}},
 {"settable", {LUA_T_CFUNCTION, gettableFB}},
-{"gc", {LUA_T_CFUNCTION, GDFB}}
+{"gc", {LUA_T_CFUNCTION, GDFB}},
+{"function", {LUA_T_CFUNCTION, funcFB}}
 };
 
 #define N_FB  (sizeof(luaI_fallBacks)/sizeof(struct FB))
@@ -103,6 +105,11 @@ static void orderFB (void)
 
 static void GDFB (void) { }
 
+static void funcFB (void)
+{
+  lua_reportbug("call expression not a function");
+}
+
 
 /*
 ** Lock routines
diff --git a/fallback.h b/fallback.h
index 33c22b0d..8da9dd2e 100644
--- a/fallback.h
+++ b/fallback.h
@@ -1,5 +1,5 @@
 /*
-** $Id: fallback.h,v 1.5 1994/11/18 19:46:21 roberto Exp roberto $
+** $Id: fallback.h,v 1.6 1994/11/21 13:30:15 roberto Exp roberto $
 */
  
 #ifndef fallback_h
@@ -20,6 +20,7 @@ extern struct FB {
 #define FB_CONCAT  5
 #define FB_SETTABLE  6
 #define FB_GC 7
+#define FB_FUNCTION 8
 
 void luaI_setfallback (void);
 int luaI_lock (Object *object);
diff --git a/opcode.c b/opcode.c
index 55a41ee1..0e8a8598 100644
--- a/opcode.c
+++ b/opcode.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
 
-char *rcs_opcode="$Id: opcode.c,v 3.18 1994/11/18 19:46:21 roberto Exp roberto $";
+char *rcs_opcode="$Id: opcode.c,v 3.19 1994/11/21 13:30:15 roberto Exp $";
 
 #include <setjmp.h>
 #include <stdio.h>
@@ -209,6 +209,20 @@ static int callC (lua_CFunction func, int base)
   return firstResult;
 }
 
+/*
+** Call the fallback for invalid functions (see do_call)
+*/
+static void call_funcFB (Object *func, int base, int nResults, int whereRes)
+{
+  int i;
+  /* open space for first parameter (func) */
+  for (i=top-stack; i>base; i--)
+    stack[i] = stack[i-1];
+  top++;
+  stack[base] = *func;
+  do_call(&luaI_fallBacks[FB_FUNCTION].function, base, nResults, whereRes);
+}
+
 
 /*
 ** Call a function (C or Lua). The parameters must be on the stack,
@@ -224,9 +238,9 @@ static void do_call (Object *func, int base, int nResults, int whereRes)
   else if (tag(func) == LUA_T_FUNCTION)
     firstResult = lua_execute(bvalue(func), base);
   else
-  {
-   lua_reportbug ("call expression not a function");
-   return;  /* to avoid warnings */
+  { /* func is not a function */
+    call_funcFB(func, base, nResults, whereRes);
+    return;
   }
   /* adjust the number of results */
   if (nResults != MULT_RET && top - (stack+firstResult) != nResults)