no need to keep "_ENV" name in global state (can be kept in lex state)

llex.c

@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 2.34 2009/11/17 16:33:38 roberto Exp roberto $
+** $Id: llex.c,v 2.35 2010/02/27 21:16:24 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -152,6 +152,8 @@ void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
   ls->linenumber = 1;
   ls->lastline = 1;
   ls->source = source;
+  ls->envn = luaS_new(L, "_ENV");
+  luaS_fix(ls->envn);  /* never collect this name */
   luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER);  /* initialize buffer */
   next(ls);  /* read first char */
 }

llex.h

@@ -1,5 +1,5 @@
 /*
-** $Id: llex.h,v 1.63 2010/03/08 16:55:52 roberto Exp roberto $
+** $Id: llex.h,v 1.64 2010/03/13 15:55:42 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -60,6 +60,7 @@ typedef struct LexState {
   Mbuffer *buff;  /* buffer for tokens */
   struct Varlist *varl;  /* list of all active local variables */
   TString *source;  /* current source name */
+  TString *envn;  /* environment variable name */
   char decpoint;  /* locale decimal point */
 } LexState;
 

lparser.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lparser.c,v 2.80 2010/03/13 15:55:42 roberto Exp roberto $
+** $Id: lparser.c,v 2.81 2010/04/05 16:26:37 roberto Exp roberto $
 ** Lua Parser
 ** See Copyright Notice in lua.h
 */
@@ -288,7 +288,7 @@ static void singlevar (LexState *ls, expdesc *var) {
   FuncState *fs = ls->fs;
   if (singlevaraux(fs, varname, var, 1) == VVOID) {  /* global name? */
     expdesc key;
-    singlevaraux(fs, G(ls->L)->envn, var, 1);  /* get _ENV variable */
+    singlevaraux(fs, ls->envn, var, 1);  /* get _ENV variable */
     lua_assert(var->k == VLOCAL || var->k == VUPVAL);
     codestring(ls, &key, varname);  /* key is variable name */
     luaK_indexed(fs, var, &key);  /* env[varname] */
@@ -429,12 +429,12 @@ static void close_func (LexState *ls) {
 ** opens the main function, which is a regular vararg function with an
 ** upvalue named '_ENV'
 */
-static void open_mainfunc (lua_State *L, LexState *ls, FuncState *fs) {
+static void open_mainfunc (LexState *ls, FuncState *fs) {
   expdesc v;
   open_func(ls, fs);
   fs->f->is_vararg = 1;  /* main function is always vararg */
   init_exp(&v, VLOCAL, 0);
-  newupvalue(fs, G(L)->envn, &v);  /* create '_ENV' upvalue */
+  newupvalue(fs, ls->envn, &v);  /* create '_ENV' upvalue */
 }
 
 
@@ -448,7 +448,7 @@ Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, Varlist *varl,
   lexstate.buff = buff;
   lexstate.varl = varl;
   luaX_setinput(L, &lexstate, z, tname);
-  open_mainfunc(L, &lexstate, &funcstate);
+  open_mainfunc(&lexstate, &funcstate);
   luaX_next(&lexstate);  /* read first token */
   chunk(&lexstate);  /* read main chunk */
   check(&lexstate, TK_EOS);

lstate.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 2.75 2010/03/26 20:58:11 roberto Exp roberto $
+** $Id: lstate.c,v 2.76 2010/03/29 17:43:14 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -157,8 +157,6 @@ static void f_luaopen (lua_State *L, void *ud) {
   luaS_resize(L, MINSTRTABSIZE);  /* initial size of string table */
   luaT_init(L);
   luaX_init(L);
-  g->envn = luaS_new(L, "_ENV");
-  luaS_fix(g->envn);  /* never collect this name */
   luaS_fix(luaS_newliteral(L, MEMERRMSG));
   g->GCthreshold = 4*g->totalbytes;
 }

lstate.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 2.58 2010/03/26 20:58:11 roberto Exp roberto $
+** $Id: lstate.h,v 2.59 2010/03/29 17:43:14 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -142,7 +142,6 @@ typedef struct global_State {
   lua_CFunction panic;  /* to be called in unprotected errors */
   struct lua_State *mainthread;
   const lua_Number *version;  /* pointer to version number */
-  TString *envn;  /* environment variable name */
   TString *tmname[TM_N];  /* array with tag-method names */
   struct Table *mt[NUM_TAGS];  /* metatables for basic types */
 } global_State;