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Make implicit Lua global variables local

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This commit is contained in:
James R 2020-01-17 04:27:39 -08:00
parent d96719da67
commit 7ecaadba7e
1 changed files with 27 additions and 3 deletions
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30
src/blua/lparser.c
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@ -24,6 +24,7 @@
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "lvm.h"
@ -1006,11 +1007,33 @@ static void poplhs (FuncState *fs) {
}
static void assignment (LexState *ls) {
static void implicitlocal (LexState *ls, expdesc *v, int *nvarsp) {
TValue *name;
int n;
if (v->k == VGLOBAL) {
/* Overwriting this shouldn't matter as long as
I put it back, right? Right? :sweat_drops: */
StkId old = ls->L->base;
/* I tried to optimize this down as far as I could... */
name = &ls->fs->f->k[v->u.s.info];/* global's name from singlevar */
luaV_gettable(ls->L, gt(ls->L), name, (TValue *)ls->L->base);
if (ttisnil(ls->L->base)) {/* james: if global don't exist, make local */
n = (*nvarsp)++;
new_localvar(ls, rawtsvalue(name), n);
/* can't forget to enumerate it as local! */
v->k = VLOCAL;
v->u.s.info = ls->fs->nactvar + n;
}
ls->L->base = old;
}
}
static void assignment (LexState *ls, int nvars) {
expdesc e;
expdesc_list *lh = ls->fs->lhs;
check_condition(ls, VLOCAL <= lh->v.k && lh->v.k <= VINDEXED,
"syntax error");
implicitlocal(ls, &lh->v, &nvars);
if (testnext(ls, ',')) { /* assignment -> `,' primaryexp assignment */
expdesc_list nv;
nv.prev = lh;
@ -1020,11 +1043,12 @@ static void assignment (LexState *ls) {
luaY_checklimit(ls->fs, ls->fs->nrhs, LUAI_MAXCCALLS - ls->L->nCcalls,
"variables in assignment");
pushlhs(ls->fs, &nv);
assignment(ls);
assignment(ls, nvars);
poplhs(ls->fs);
}
else { /* assignment -> `=' explist1 */
// int nexps;
adjustlocalvars(ls, nvars);
checknext(ls, '=');
ls->fs->nrhs = 1;
expr(ls, &e);
@ -1382,7 +1406,7 @@ static void exprstat (LexState *ls) {
v.prev = NULL;
lua_assert(ls->fs->lhs == NULL && ls->fs->nlhs == 0 && ls->fs->nrhs == 0);
pushlhs(ls->fs, &v);
assignment(ls);
assignment(ls, 0);
poplhs(ls->fs);
ls->fs->nrhs = 0;
lua_assert(ls->fs->lhs == NULL && ls->fs->nlhs == 0);