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first step towards _ENV: all chunks have an puvalues _ENV with the

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global table
This commit is contained in:
Roberto Ierusalimschy 2010-03-08 13:55:52 -03:00
parent c295147874
commit 1124cb1247
3 changed files with 33 additions and 13 deletions
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8
lapi.c
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@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.112 2010/01/21 16:49:21 roberto Exp roberto $
** $Id: lapi.c,v 2.113 2010/02/09 11:55:37 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -882,6 +882,12 @@ LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
if (!chunkname) chunkname = "?";
luaZ_init(L, &z, reader, data);
status = luaD_protectedparser(L, &z, chunkname);
if (status == LUA_OK) {
Closure *f = clvalue(L->top - 1);
lua_assert(!f->c.isC);
if (f->l.nupvalues == 1)
sethvalue(L, f->l.upvals[0]->v, G(L)->l_gt);
}
lua_unlock(L);
return status;
}

3
llex.h
View file

@ -1,5 +1,5 @@
/*
** $Id: llex.h,v 1.61 2007/10/25 16:45:47 roberto Exp roberto $
** $Id: llex.h,v 1.62 2009/10/11 20:02:19 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; /* name of environment variable */
char decpoint; /* locale decimal point */
} LexState;

35
lparser.c
View file

@ -1,5 +1,5 @@
/*
** $Id: lparser.c,v 2.76 2010/02/26 20:40:29 roberto Exp roberto $
** $Id: lparser.c,v 2.77 2010/03/04 18:12:57 roberto Exp roberto $
** Lua Parser
** See Copyright Notice in lua.h
*/
@ -224,10 +224,10 @@ static int newupvalue (FuncState *fs, TString *name, expdesc *v) {
luaM_growvector(fs->L, f->upvalues, fs->nups, f->sizeupvalues,
Upvaldesc, UCHAR_MAX, "upvalues");
while (oldsize < f->sizeupvalues) f->upvalues[oldsize++].name = NULL;
f->upvalues[fs->nups].name = name;
luaC_objbarrier(fs->L, f, name);
f->upvalues[fs->nups].instack = (v->k == VLOCAL);
f->upvalues[fs->nups].idx = cast_byte(v->u.s.info);
f->upvalues[fs->nups].name = name;
luaC_objbarrier(fs->L, f, name);
return fs->nups++;
}
@ -430,26 +430,39 @@ 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) {
expdesc v;
open_func(ls, fs);
fs->f->is_vararg = 1; /* main function is always vararg */
ls->envn = luaS_new(L, "_ENV"); /* create '_ENV' string */
setsvalue2s(L, L->top++, ls->envn); /* anchor it */
init_exp(&v, VLOCAL, 0);
newupvalue(fs, ls->envn, &v); /* create '_ENV' upvalue */
L->top--; /* now string is anchored as an upvalue name */
}
Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, Varlist *varl,
const char *name) {
struct LexState lexstate;
struct FuncState funcstate;
LexState lexstate;
FuncState funcstate;
TString *tname = luaS_new(L, name);
setsvalue2s(L, L->top, tname); /* push name to protect it */
incr_top(L);
lexstate.buff = buff;
lexstate.varl = varl;
luaX_setinput(L, &lexstate, z, tname);
open_func(&lexstate, &funcstate);
funcstate.f->is_vararg = 1; /* main function is always vararg */
open_mainfunc(L, &lexstate, &funcstate);
luaX_next(&lexstate); /* read first token */
chunk(&lexstate);
chunk(&lexstate); /* read main chunk */
check(&lexstate, TK_EOS);
close_func(&lexstate);
L->top--; /* pop name */
lua_assert(funcstate.prev == NULL);
lua_assert(funcstate.nups == 0);
lua_assert(lexstate.fs == NULL);
lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs);
return funcstate.f;
}