From 43382ce5a22838af182807b451a12c474e21da78 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 30 Jan 1996 13:25:23 -0200
Subject: [PATCH] new fallback "getglobal".

---
 fallback.c |  6 ++++--
 fallback.h |  3 ++-
 opcode.c   | 21 +++++++++++++++------
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/fallback.c b/fallback.c
index e7f6a8bf..13b763f9 100644
--- a/fallback.c
+++ b/fallback.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
  
-char *rcs_fallback="$Id: fallback.c,v 1.16 1995/10/17 11:52:38 roberto Exp roberto $";
+char *rcs_fallback="$Id: fallback.c,v 1.17 1995/10/17 14:30:05 roberto Exp roberto $";
 
 #include <stdio.h>
 #include <string.h>
@@ -36,8 +36,10 @@ struct FB  luaI_fallBacks[] = {
 {"concat", {LUA_T_CFUNCTION, {concatFB}}, 2, 1},
 {"settable", {LUA_T_CFUNCTION, {gettableFB}}, 3, 0},
 {"gc", {LUA_T_CFUNCTION, {GDFB}}, 1, 0},
-{"function", {LUA_T_CFUNCTION, {funcFB}}, -1, -1}
+{"function", {LUA_T_CFUNCTION, {funcFB}}, -1, -1},
                                 /* no fixed number of params or results */
+{"getglobal", {LUA_T_CFUNCTION, {indexFB}}, 1, 1}
+                                /* same default behavior of index FB */
 };
 
 #define N_FB  (sizeof(luaI_fallBacks)/sizeof(struct FB))
diff --git a/fallback.h b/fallback.h
index b4ba373b..4ea72808 100644
--- a/fallback.h
+++ b/fallback.h
@@ -1,5 +1,5 @@
 /*
-** $Id: fallback.h,v 1.9 1995/10/09 13:14:29 roberto Exp roberto $
+** $Id: fallback.h,v 1.10 1995/10/17 11:52:38 roberto Exp roberto $
 */
  
 #ifndef fallback_h
@@ -23,6 +23,7 @@ extern struct FB {
 #define FB_SETTABLE  6
 #define FB_GC 7
 #define FB_FUNCTION 8
+#define FB_GETGLOBAL 9
 
 void luaI_setfallback (void);
 int luaI_lock (Object *object);
diff --git a/opcode.c b/opcode.c
index 2708f949..6d2d4cc0 100644
--- a/opcode.c
+++ b/opcode.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
 
-char *rcs_opcode="$Id: opcode.c,v 3.52 1996/01/09 20:22:44 roberto Exp roberto $";
+char *rcs_opcode="$Id: opcode.c,v 3.53 1996/01/23 18:43:07 roberto Exp roberto $";
 
 #include <setjmp.h>
 #include <stdlib.h>
@@ -374,6 +374,18 @@ static void storesubscript (void)
 }
 
 
+static void getglobal (Word n)
+{
+  *top = lua_table[n].object;
+  incr_top;
+  if (tag(top-1) == LUA_T_NIL)
+  { /* must call getglobal fallback */
+    tag(top-1) = LUA_T_STRING;
+    tsvalue(top-1) = &lua_table[n].varname->ts;
+    callFB(FB_GETGLOBAL);
+  }
+}
+
 /*
 ** Traverse all objects on stack
 */
@@ -704,10 +716,8 @@ int lua_lock (void)
 */
 lua_Object lua_getglobal (char *name)
 {
- Word n = luaI_findsymbolbyname(name);
  adjustC(0);
- *top = s_object(n);
- incr_top;
+ getglobal(luaI_findsymbolbyname(name));
  CBase++;  /* incorporate object in the stack */
  return Ref(top-1);
 }
@@ -919,8 +929,7 @@ static StkId lua_execute (Byte *pc, StkId base)
    {
     CodeWord code;
     get_word(code,pc);
-    *top = s_object(code.w);
-    incr_top;
+    getglobal(code.w);
    }
    break;