** Traverse an ephemeron table and link it to proper list. Returns true ** iff any object was marked during this traversal (which implies that ** convergence has to continue). During propagation phase, keep table ** in 'grayagain' list, to be visited again in the atomic phase. In ** the atomic phase, if table has any white->white entry, it has to ** be revisited during ephemeron convergence (as th
| 414 | ** tables) must be kept in some gray list for post-processing. |
| 415 | */ |
| 416 | static int traverseephemeron (global_State *g, Table *h, int inv) { |
| 417 | int marked = 0; /* true if an object is marked in this traversal */ |
| 418 | int hasclears = 0; /* true if table has white keys */ |
| 419 | int hasww = 0; /* true if table has entry "white-key -> white-value" */ |
| 420 | unsigned int i; |
| 421 | unsigned int asize = luaH_realasize(h); |
| 422 | unsigned int nsize = sizenode(h); |
| 423 | /* traverse array part */ |
| 424 | for (i = 0; i < asize; i++) { |
| 425 | if (valiswhite(&h->array[i])) { |
| 426 | marked = 1; |
| 427 | reallymarkobject(g, gcvalue(&h->array[i])); |
| 428 | } |
| 429 | } |
| 430 | /* traverse hash part; if 'inv', traverse descending |
| 431 | (see 'convergeephemerons') */ |
| 432 | for (i = 0; i < nsize; i++) { |
| 433 | Node *n = inv ? gnode(h, nsize - 1 - i) : gnode(h, i); |
| 434 | if (isempty(gval(n))) /* entry is empty? */ |
| 435 | clearkey(n); /* clear its key */ |
| 436 | else if (iscleared(g, gckeyN(n))) { /* key is not marked (yet)? */ |
| 437 | hasclears = 1; /* table must be cleared */ |
| 438 | if (valiswhite(gval(n))) /* value not marked yet? */ |
| 439 | hasww = 1; /* white-white entry */ |
| 440 | } |
| 441 | else if (valiswhite(gval(n))) { /* value not marked yet? */ |
| 442 | marked = 1; |
| 443 | reallymarkobject(g, gcvalue(gval(n))); /* mark it now */ |
| 444 | } |
| 445 | } |
| 446 | /* link table into proper list */ |
| 447 | if (g->gcstate == GCSpropagate) |
| 448 | linkgclist(h, g->grayagain); /* must retraverse it in atomic phase */ |
| 449 | else if (hasww) /* table has white->white entries? */ |
| 450 | linkgclist(h, g->ephemeron); /* have to propagate again */ |
| 451 | else if (hasclears) /* table has white keys? */ |
| 452 | linkgclist(h, g->allweak); /* may have to clean white keys */ |
| 453 | else if (g->gckind == KGC_GEN) |
| 454 | linkgclist(h, g->grayagain); /* keep it in some list */ |
| 455 | else |
| 456 | gray2black(h); |
| 457 | return marked; |
| 458 | } |
| 459 | |
| 460 | |
| 461 | static void traversestrongtable (global_State *g, Table *h) { |
no test coverage detected