From 4c5d7b2dddeb853b61489d02b738572eb29cb323 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 26 Mar 2004 11:02:41 -0300
Subject: small optimization for {f()}

---
 lparser.c | 3 ++-
 ltable.c  | 6 +++---
 ltable.h  | 3 ++-
 lvm.c     | 7 ++++---
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/lparser.c b/lparser.c
index ec5ae272..b8e1b2a7 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.1 2003/12/10 12:13:36 roberto Exp roberto $
+** $Id: lparser.c,v 2.2 2004/03/12 19:53:56 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -483,6 +483,7 @@ static void lastlistfield (FuncState *fs, struct ConsControl *cc) {
   if (cc->v.k == VCALL) {
     luaK_setcallreturns(fs, &cc->v, LUA_MULTRET);
     luaK_codeABx(fs, OP_SETLISTO, cc->t->info, cc->na-1);
+    cc->na--;  /* do not count last expression (unknown number of elements) */
   }
   else {
     if (cc->v.k != VVOID)
diff --git a/ltable.c b/ltable.c
index 797690b4..fff4716d 100644
--- a/ltable.c
+++ b/ltable.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 1.138 2003/12/09 16:56:11 roberto Exp roberto $
+** $Id: ltable.c,v 2.1 2003/12/10 12:13:36 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -270,7 +270,7 @@ static void setnodevector (lua_State *L, Table *t, int lsize) {
 }
 
 
-static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
+void luaH_resize (lua_State *L, Table *t, int nasize, int nhsize) {
   int i;
   int oldasize = t->sizearray;
   int oldhsize = t->lsizenode;
@@ -315,7 +315,7 @@ static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
 static void rehash (lua_State *L, Table *t) {
   int nasize, nhsize;
   numuse(t, &nasize, &nhsize);  /* compute new sizes for array and hash parts */
-  resize(L, t, nasize, luaO_log2(nhsize)+1);
+  luaH_resize(L, t, nasize, luaO_log2(nhsize)+1);
 }
 
 
diff --git a/ltable.h b/ltable.h
index e953bb70..902beec4 100644
--- a/ltable.h
+++ b/ltable.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 1.45 2003/08/26 12:04:13 roberto Exp roberto $
+** $Id: ltable.h,v 2.1 2003/12/10 12:13:36 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -22,6 +22,7 @@ TValue *luaH_setstr (lua_State *L, Table *t, TString *key);
 const TValue *luaH_get (Table *t, const TValue *key);
 TValue *luaH_set (lua_State *L, Table *t, const TValue *key);
 Table *luaH_new (lua_State *L, int narray, int lnhash);
+void luaH_resize (lua_State *L, Table *t, int nasize, int nhsize);
 void luaH_free (lua_State *L, Table *t);
 int luaH_next (lua_State *L, Table *t, StkId key);
 
diff --git a/lvm.c b/lvm.c
index a953bfc9..779245f2 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.1 2003/12/10 12:13:36 roberto Exp roberto $
+** $Id: lvm.c,v 2.2 2004/03/16 12:31:40 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -701,12 +701,11 @@ StkId luaV_execute (lua_State *L, int nexeccalls) {
       }
       case OP_SETLIST:
       case OP_SETLISTO: {
-        int bc;
+        int bc = GETARG_Bx(i);
         int n;
         Table *h;
         runtime_check(L, ttistable(ra));
         h = hvalue(ra);
-        bc = GETARG_Bx(i);
         if (GET_OPCODE(i) == OP_SETLIST)
           n = (bc&(LFIELDS_PER_FLUSH-1)) + 1;
         else {
@@ -714,6 +713,8 @@ StkId luaV_execute (lua_State *L, int nexeccalls) {
           L->top = L->ci->top;
         }
         bc &= ~(LFIELDS_PER_FLUSH-1);  /* bc = bc - bc%FPF */
+        if (bc+n > h->sizearray)  /* needs more space? */
+          luaH_resize(L, h,  bc+n, h->lsizenode);  /* pre-alloc it at once */
         for (; n > 0; n--) {
           TValue *val = ra+n;
           setobj2t(L, luaH_setnum(L, h, bc+n), val);
-- 
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