summaryrefslogtreecommitdiff
path: root/utils/themeeditor (follow)
Commit message (Expand)AuthorAge
* Theme Editor: Added support for larger fontsRobert Bieber2010-07-11
* Theme Editor: Fixed rendering behavior of default viewport. Now when other v...Robert Bieber2010-07-11
* Theme Editor: Added RBTouchArea class. Touch areas on a theme can now be dis...Robert Bieber2010-07-10
* Theme Editor: Implemented timer panel functionality, added missing seconds fi...Robert Bieber2010-07-09
* Theme Editor: Built a ui for the timer panel, not functional yetRobert Bieber2010-07-08
* Theme Editor: Simplified clock tab in device control panel, now one set of va...Robert Bieber2010-07-08
* Theme Editor: Implemented the song time (pS, pE, px, pc, etc.) in the device ...Robert Bieber2010-07-08
* Theme Editor: Began working on special cases for device option panel. Implem...Robert Bieber2010-07-08
* Theme Editor: Removed papause from line scrollingRobert Bieber2010-07-08
* Theme Editor: Implemented line scrollingRobert Bieber2010-07-07
* Theme Editor: Made auto-expand/highlight of parse tree optional (through pref...Robert Bieber2010-07-07
* Theme Editor: Implemented caching for rendered text, added profiling info to ...Robert Bieber2010-07-07
* Theme Editor: Fixed rendering bug that caused text in sublines not to appear,...Robert Bieber2010-07-07
* Theme Editor: Delaying rendering of text lines until newline reachedRobert Bieber2010-07-07
* Theme Editor: WorkingWorking on speeding up the renderer, replaced for-loops ...Robert Bieber2010-07-07
* Theme Editor: Made all lines of text render as a single graphic, viewport siz...Robert Bieber2010-07-07
* Theme Editor: Moved volume options in device configuration panelRobert Bieber2010-07-07
* Add Theme Editor application icon for WindowsDominik Riebeling2010-07-06
* Add Info.plist and application icon to Theme Editor on OS X.Dominik Riebeling2010-07-06
* Rework libskin_parser Makefile for OS X support.Dominik Riebeling2010-07-06
* Theme Editor: Added font directory option in preferences dialog, renderer wil...Robert Bieber2010-07-06
* Theme Editor: Default theme font is now correctly loadedRobert Bieber2010-07-06
* Theme Editor: Rockbox FNT files now supported. Theme editor will currently l...Robert Bieber2010-07-06
* Theme Editor: Began working on font loading. Font header info is now read an...Robert Bieber2010-07-05
* Theme Editor: Added the built-in font to the project resourcesRobert Bieber2010-07-05
* Theme Editor: Fixed redundant directory separator bug in addresourcedir scriptRobert Bieber2010-07-05
* Theme Editor: Added a small PHP script to auto-generate a qrc entry for a dir...Robert Bieber2010-07-05
* Theme Editor: Enabled conditional display of ID3/file info with checkbox on t...Robert Bieber2010-07-05
* Theme Editor: Fixed bug that caused WPS skins without SBS parents not to rend...Robert Bieber2010-07-05
* s/SUBLINES/LINE_ALTERNATOR/Jonathan Gordon2010-07-04
* Theme Editor: WPS documents rendered within SBS documents can now set backdropsRobert Bieber2010-07-04
* Theme Editor: Implemented a flags column in the tag table, removed the \n fla...Robert Bieber2010-07-04
* Theme Editor: Switched device configuration panel to a QFormLayoutRobert Bieber2010-07-03
* Theme Editor: Fixed cd code generation bug: Tags whose paramlists end in \n w...Robert Bieber2010-07-03
* Theme Editor: SBS will now render underneath WPS, if both are present in projectRobert Bieber2010-07-03
* Theme Editor: Status bar no longer drawn by defaultRobert Bieber2010-07-03
* Theme Editor: Implemented replace and replace all in find/replace dialogRobert Bieber2010-07-03
* Theme Editor: Made irrelevant menu items disabled at startup, made wrap-aroun...Robert Bieber2010-07-03
* Theme Editor: Removed some old debug code in skindocument.cpp, began implemen...Robert Bieber2010-07-03
* Theme Editor: Removed some old hash code that caused viewer not to update due...Robert Bieber2010-07-02
* Theme Editor: Fixed random outlining in default viewport, working on getting ...Robert Bieber2010-07-02
* Theme Editor: Switched the last two parameters of the Vp tag back to their or...Robert Bieber2010-07-02
* Theme Editor: Switched the order of the last two arguments to %Vp in renderingRobert Bieber2010-07-02
* Theme Editor: Renderer will not insert a newline at the end of a line if it's...Robert Bieber2010-07-02
* Theme Editor: Altered tag table entry for %pb to make image optional, impleme...Robert Bieber2010-07-02
* Theme Editor: Fixed line numbering bug in parser. Implemented playlist displ...Robert Bieber2010-07-01
* Theme Editor: Renderer now adds a newline after EVERY logical line in the par...Robert Bieber2010-07-01
* Theme Editor: Fixed album art positioning bug, removed unneeded debug codeRobert Bieber2010-07-01
* Theme Editor: Made blank lines render newlines in the outputRobert Bieber2010-07-01
* Theme Editor: Implemented negative x/y/w/h values in viewport declarationsRobert Bieber2010-07-01
generated by cgit v1.1 at 2026-05-08 09:44:08 +0000
/a> 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 
/*
** $Id: lgc.c,v 2.38.1.1 2007/12/27 13:02:25 roberto Exp $
** Garbage Collector
** See Copyright Notice in lua.h
*/

#include <string.h>

#define lgc_c
#define LUA_CORE

#include "lua.h"

#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"


#define GCSTEPSIZE	1024u
#define GCSWEEPMAX	40
#define GCSWEEPCOST	10
#define GCFINALIZECOST	100


#define maskmarks	cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))

#define makewhite(g,x)	\
   ((x)->gch.marked = cast_byte(((x)->gch.marked & maskmarks) | luaC_white(g)))

#define white2gray(x)	reset2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
#define black2gray(x)	resetbit((x)->gch.marked, BLACKBIT)

#define stringmark(s)	reset2bits((s)->tsv.marked, WHITE0BIT, WHITE1BIT)


#define isfinalized(u)		testbit((u)->marked, FINALIZEDBIT)
#define markfinalized(u)	l_setbit((u)->marked, FINALIZEDBIT)


#define KEYWEAK         bitmask(KEYWEAKBIT)
#define VALUEWEAK       bitmask(VALUEWEAKBIT)



#define markvalue(g,o) { checkconsistency(o); \
  if (iscollectable(o) && iswhite(gcvalue(o))) reallymarkobject(g,gcvalue(o)); }

#define markobject(g,t) { if (iswhite(obj2gco(t))) \
		reallymarkobject(g, obj2gco(t)); }


#define setthreshold(g)  (g->GCthreshold = (g->estimate/100) * g->gcpause)


static void removeentry (Node *n) {
  lua_assert(ttisnil(gval(n)));
  if (iscollectable(gkey(n)))
    setttype(gkey(n), LUA_TDEADKEY);  /* dead key; remove it */
}


static void reallymarkobject (global_State *g, GCObject *o) {
  lua_assert(iswhite(o) && !isdead(g, o));
  white2gray(o);
  switch (o->gch.tt) {
    case LUA_TSTRING: {
      return;
    }
    case LUA_TUSERDATA: {
      Table *mt = gco2u(o)->metatable;
      gray2black(o);  /* udata are never gray */
      if (mt) markobject(g, mt);
      markobject(g, gco2u(o)->env);
      return;
    }
    case LUA_TUPVAL: {
      UpVal *uv = gco2uv(o);
      markvalue(g, uv->v);
      if (uv->v == &uv->u.value)  /* closed? */
        gray2black(o);  /* open upvalues are never black */
      return;
    }
    case LUA_TFUNCTION: {
      gco2cl(o)->c.gclist = g->gray;
      g->gray = o;
      break;
    }
    case LUA_TTABLE: {
      gco2h(o)->gclist = g->gray;
      g->gray = o;
      break;
    }
    case LUA_TTHREAD: {
      gco2th(o)->gclist = g->gray;
      g->gray = o;
      break;
    }
    case LUA_TPROTO: {
      gco2p(o)->gclist = g->gray;
      g->gray = o;
      break;
    }
    default: lua_assert(0);
  }
}


static void marktmu (global_State *g) {
  GCObject *u = g->tmudata;
  if (u) {
    do {
      u = u->gch.next;
      makewhite(g, u);  /* may be marked, if left from previous GC */
      reallymarkobject(g, u);
    } while (u != g->tmudata);
  }
}


/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L, int all) {
  global_State *g = G(L);
  size_t deadmem = 0;
  GCObject **p = &g->mainthread->next;
  GCObject *curr;
  while ((curr = *p) != NULL) {
    if (!(iswhite(curr) || all) || isfinalized(gco2u(curr)))
      p = &curr->gch.next;  /* don't bother with them */
    else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) {
      markfinalized(gco2u(curr));  /* don't need finalization */
      p = &curr->gch.next;
    }
    else {  /* must call its gc method */
      deadmem += sizeudata(gco2u(curr));
      markfinalized(gco2u(curr));
      *p = curr->gch.next;
      /* link `curr' at the end of `tmudata' list */
      if (g->tmudata == NULL)  /* list is empty? */
        g->tmudata = curr->gch.next = curr;  /* creates a circular list */
      else {
        curr->gch.next = g->tmudata->gch.next;
        g->tmudata->gch.next = curr;
        g->tmudata = curr;
      }
    }
  }
  return deadmem;
}


static int traversetable (global_State *g, Table *h) {
  int i;
  int weakkey = 0;
  int weakvalue = 0;
  const TValue *mode;
  if (h->metatable)
    markobject(g, h->metatable);
  mode = gfasttm(g, h->metatable, TM_MODE);
  if (mode && ttisstring(mode)) {  /* is there a weak mode? */
    weakkey = (strchr(svalue(mode), 'k') != NULL);
    weakvalue = (strchr(svalue(mode), 'v') != NULL);
    if (weakkey || weakvalue) {  /* is really weak? */
      h->marked &= ~(KEYWEAK | VALUEWEAK);  /* clear bits */
      h->marked |= cast_byte((weakkey << KEYWEAKBIT) |
                             (weakvalue << VALUEWEAKBIT));
      h->gclist = g->weak;  /* must be cleared after GC, ... */
      g->weak = obj2gco(h);  /* ... so put in the appropriate list */
    }
  }
  if (weakkey && weakvalue) return 1;
  if (!weakvalue) {
    i = h->sizearray;
    while (i--)
      markvalue(g, &h->array[i]);
  }
  i = sizenode(h);
  while (i--) {
    Node *n = gnode(h, i);
    lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
    if (ttisnil(gval(n)))
      removeentry(n);  /* remove empty entries */
    else {
      lua_assert(!ttisnil(gkey(n)));
      if (!weakkey) markvalue(g, gkey(n));
      if (!weakvalue) markvalue(g, gval(n));
    }
  }
  return weakkey || weakvalue;
}


/*
** All marks are conditional because a GC may happen while the
** prototype is still being created
*/
static void traverseproto (global_State *g, Proto *f) {
  int i;
  if (f->source) stringmark(f->source);
  for (i=0; i<f->sizek; i++)  /* mark literals */
    markvalue(g, &f->k[i]);
  for (i=0; i<f->sizeupvalues; i++) {  /* mark upvalue names */
    if (f->upvalues[i])
      stringmark(f->upvalues[i]);
  }
  for (i=0; i<f->sizep; i++) {  /* mark nested protos */
    if (f->p[i])
      markobject(g, f->p[i]);
  }
  for (i=0; i<f->sizelocvars; i++) {  /* mark local-variable names */
    if (f->locvars[i].varname)
      stringmark(f->locvars[i].varname);
  }
}



static void traverseclosure (global_State *g, Closure *cl) {
  markobject(g, cl->c.env);
  if (cl->c.isC) {
    int i;
    for (i=0; i<cl->c.nupvalues; i++)  /* mark its upvalues */
      markvalue(g, &cl->c.upvalue[i]);
  }
  else {
    int i;
    lua_assert(cl->l.nupvalues == cl->l.p->nups);
    markobject(g, cl->l.p);
    for (i=0; i<cl->l.nupvalues; i++)  /* mark its upvalues */
      markobject(g, cl->l.upvals[i]);
  }
}


static void checkstacksizes (lua_State *L, StkId max) {
  int ci_used = cast_int(L->ci - L->base_ci);  /* number of `ci' in use */
  int s_used = cast_int(max - L->stack);  /* part of stack in use */
  if (L->size_ci > LUAI_MAXCALLS)  /* handling overflow? */
    return;  /* do not touch the stacks */
  if (4*ci_used < L->size_ci && 2*BASIC_CI_SIZE < L->size_ci)
    luaD_reallocCI(L, L->size_ci/2);  /* still big enough... */
  condhardstacktests(luaD_reallocCI(L, ci_used + 1));
  if (4*s_used < L->stacksize &&
      2*(BASIC_STACK_SIZE+EXTRA_STACK) < L->stacksize)
    luaD_reallocstack(L, L->stacksize/2);  /* still big enough... */
  condhardstacktests(luaD_reallocstack(L, s_used));
}


static void traversestack (global_State *g, lua_State *l) {
  StkId o, lim;
  CallInfo *ci;
  markvalue(g, gt(l));
  lim = l->top;
  for (ci = l->base_ci; ci <= l->ci; ci++) {
    lua_assert(ci->top <= l->stack_last);
    if (lim < ci->top) lim = ci->top;
  }
  for (o = l->stack; o < l->top; o++)
    markvalue(g, o);
  for (; o <= lim; o++)
    setnilvalue(o);
  checkstacksizes(l, lim);
}


/*
** traverse one gray object, turning it to black.
** Returns `quantity' traversed.
*/
static l_mem propagatemark (global_State *g) {
  GCObject *o = g->gray;
  lua_assert(isgray(o));
  gray2black(o);
  switch (o->gch.tt) {
    case LUA_TTABLE: {
      Table *h = gco2h(o);
      g->gray = h->gclist;
      if (traversetable(g, h))  /* table is weak? */
        black2gray(o);  /* keep it gray */
      return sizeof(Table) + sizeof(TValue) * h->sizearray +
                             sizeof(Node) * sizenode(h);
    }
    case LUA_TFUNCTION: {
      Closure *cl = gco2cl(o);
      g->gray = cl->c.gclist;
      traverseclosure(g, cl);
      return (cl->c.isC) ? sizeCclosure(cl->c.nupvalues) :
                           sizeLclosure(cl->l.nupvalues);
    }
    case LUA_TTHREAD: {
      lua_State *th = gco2th(o);
      g->gray = th->gclist;
      th->gclist = g->grayagain;
      g->grayagain = o;
      black2gray(o);
      traversestack(g, th);
      return sizeof(lua_State) + sizeof(TValue) * th->stacksize +
                                 sizeof(CallInfo) * th->size_ci;
    }
    case LUA_TPROTO: {
      Proto *p = gco2p(o);
      g->gray = p->gclist;
      traverseproto(g, p);
      return sizeof(Proto) + sizeof(Instruction) * p->sizecode +
                             sizeof(Proto *) * p->sizep +
                             sizeof(TValue) * p->sizek + 
                             sizeof(int) * p->sizelineinfo +
                             sizeof(LocVar) * p->sizelocvars +
                             sizeof(TString *) * p->sizeupvalues;
    }
    default: lua_assert(0); return 0;
  }
}


static size_t propagateall (global_State *g) {
  size_t m = 0;
  while (g->gray) m += propagatemark(g);
  return m;
}


/*
** The next function tells whether a key or value can be cleared from
** a weak table. Non-collectable objects are never removed from weak
** tables. Strings behave as `values', so are never removed too. for
** other objects: if really collected, cannot keep them; for userdata
** being finalized, keep them in keys, but not in values
*/
static int iscleared (const TValue *o, int iskey) {
  if (!iscollectable(o)) return 0;
  if (ttisstring(o)) {
    stringmark(rawtsvalue(o));  /* strings are `values', so are never weak */
    return 0;
  }
  return iswhite(gcvalue(o)) ||
    (ttisuserdata(o) && (!iskey && isfinalized(uvalue(o))));
}


/*
** clear collected entries from weaktables
*/
static void cleartable (GCObject *l) {
  while (l) {
    Table *h = gco2h(l);
    int i = h->sizearray;
    lua_assert(testbit(h->marked, VALUEWEAKBIT) ||
               testbit(h->marked, KEYWEAKBIT));
    if (testbit(h->marked, VALUEWEAKBIT)) {
      while (i--) {
        TValue *o = &h->array[i];
        if (iscleared(o, 0))  /* value was collected? */
          setnilvalue(o);  /* remove value */
      }
    }
    i = sizenode(h);
    while (i--) {
      Node *n = gnode(h, i);
      if (!ttisnil(gval(n)) &&  /* non-empty entry? */
          (iscleared(key2tval(n), 1) || iscleared(gval(n), 0))) {
        setnilvalue(gval(n));  /* remove value ... */
        removeentry(n);  /* remove entry from table */
      }
    }
    l = h->gclist;
  }
}


static void freeobj (lua_State *L, GCObject *o) {
  switch (o->gch.tt) {
    case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
    case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
    case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;
    case LUA_TTABLE: luaH_free(L, gco2h(o)); break;
    case LUA_TTHREAD: {
      lua_assert(gco2th(o) != L && gco2th(o) != G(L)->mainthread);
      luaE_freethread(L, gco2th(o));
      break;
    }
    case LUA_TSTRING: {
      G(L)->strt.nuse--;
      luaM_freemem(L, o, sizestring(gco2ts(o)));
      break;
    }
    case LUA_TUSERDATA: {
      luaM_freemem(L, o, sizeudata(gco2u(o)));
      break;
    }
    default: lua_assert(0);
  }
}



#define sweepwholelist(L,p)	sweeplist(L,p,MAX_LUMEM)


static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
  GCObject *curr;
  global_State *g = G(L);
  int deadmask = otherwhite(g);
  while ((curr = *p) != NULL && count-- > 0) {
    if (curr->gch.tt == LUA_TTHREAD)  /* sweep open upvalues of each thread */
      sweepwholelist(L, &gco2th(curr)->openupval);
    if ((curr->gch.marked ^ WHITEBITS) & deadmask) {  /* not dead? */
      lua_assert(!isdead(g, curr) || testbit(curr->gch.marked, FIXEDBIT));
      makewhite(g, curr);  /* make it white (for next cycle) */
      p = &curr->gch.next;
    }
    else {  /* must erase `curr' */
      lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
      *p = curr->gch.next;
      if (curr == g->rootgc)  /* is the first element of the list? */
        g->rootgc = curr->gch.next;  /* adjust first */
      freeobj(L, curr);
    }
  }
  return p;
}


static void checkSizes (lua_State *L) {
  global_State *g = G(L);
  /* check size of string hash */
  if (g->strt.nuse < cast(lu_int32, g->strt.size/4) &&
      g->strt.size > MINSTRTABSIZE*2)
    luaS_resize(L, g->strt.size/2);  /* table is too big */
  /* check size of buffer */
  if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) {  /* buffer too big? */
    size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
    luaZ_resizebuffer(L, &g->buff, newsize);
  }
}


static void GCTM (lua_State *L) {
  global_State *g = G(L);
  GCObject *o = g->tmudata->gch.next;  /* get first element */
  Udata *udata = rawgco2u(o);
  const TValue *tm;
  /* remove udata from `tmudata' */
  if (o == g->tmudata)  /* last element? */
    g->tmudata = NULL;
  else
    g->tmudata->gch.next = udata->uv.next;
  udata->uv.next = g->mainthread->next;  /* return it to `root' list */
  g->mainthread->next = o;
  makewhite(g, o);
  tm = fasttm(L, udata->uv.metatable, TM_GC);
  if (tm != NULL) {
    lu_byte oldah = L->allowhook;
    lu_mem oldt = g->GCthreshold;
    L->allowhook = 0;  /* stop debug hooks during GC tag method */
    g->GCthreshold = 2*g->totalbytes;  /* avoid GC steps */
    setobj2s(L, L->top, tm);
    setuvalue(L, L->top+1, udata);
    L->top += 2;
    luaD_call(L, L->top - 2, 0);
    L->allowhook = oldah;  /* restore hooks */
    g->GCthreshold = oldt;  /* restore threshold */
  }
}


/*
** Call all GC tag methods
*/
void luaC_callGCTM (lua_State *L) {
  while (G(L)->tmudata)
    GCTM(L);
}


void luaC_freeall (lua_State *L) {
  global_State *g = G(L);
  int i;
  g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT);  /* mask to collect all elements */
  sweepwholelist(L, &g->rootgc);
  for (i = 0; i < g->strt.size; i++)  /* free all string lists */
    sweepwholelist(L, &g->strt.hash[i]);
}


static void markmt (global_State *g) {
  int i;
  for (i=0; i<NUM_TAGS; i++)
    if (g->mt[i]) markobject(g, g->mt[i]);
}


/* mark root set */
static void markroot (lua_State *L) {
  global_State *g = G(L);
  g->gray = NULL;
  g->grayagain = NULL;
  g->weak = NULL;
  markobject(g, g->mainthread);
  /* make global table be traversed before main stack */
  markvalue(g, gt(g->mainthread));
  markvalue(g, registry(L));
  markmt(g);
  g->gcstate = GCSpropagate;
}


static void remarkupvals (global_State *g) {
  UpVal *uv;
  for (uv = g->uvhead.u.l.next; uv != &g->uvhead; uv = uv->u.l.next) {
    lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
    if (isgray(obj2gco(uv)))
      markvalue(g, uv->v);
  }
}


static void atomic (lua_State *L) {
  global_State *g = G(L);
  size_t udsize;  /* total size of userdata to be finalized */
  /* remark occasional upvalues of (maybe) dead threads */
  remarkupvals(g);
  /* traverse objects cautch by write barrier and by 'remarkupvals' */
  propagateall(g);
  /* remark weak tables */
  g->gray = g->weak;
  g->weak = NULL;
  lua_assert(!iswhite(obj2gco(g->mainthread)));
  markobject(g, L);  /* mark running thread */
  markmt(g);  /* mark basic metatables (again) */
  propagateall(g);
  /* remark gray again */
  g->gray = g->grayagain;
  g->grayagain = NULL;
  propagateall(g);
  udsize = luaC_separateudata(L, 0);  /* separate userdata to be finalized */
  marktmu(g);  /* mark `preserved' userdata */
  udsize += propagateall(g);  /* remark, to propagate `preserveness' */
  cleartable(g->weak);  /* remove collected objects from weak tables */
  /* flip current white */
  g->currentwhite = cast_byte(otherwhite(g));
  g->sweepstrgc = 0;
  g->sweepgc = &g->rootgc;
  g->gcstate = GCSsweepstring;
  g->estimate = g->totalbytes - udsize;  /* first estimate */
}


static l_mem singlestep (lua_State *L) {
  global_State *g = G(L);
  /*lua_checkmemory(L);*/
  switch (g->gcstate) {
    case GCSpause: {
      markroot(L);  /* start a new collection */
      return 0;
    }
    case GCSpropagate: {
      if (g->gray)
        return propagatemark(g);
      else {  /* no more `gray' objects */
        atomic(L);  /* finish mark phase */
        return 0;
      }
    }
    case GCSsweepstring: {
      lu_mem old = g->totalbytes;
      sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]);
      if (g->sweepstrgc >= g->strt.size)  /* nothing more to sweep? */
        g->gcstate = GCSsweep;  /* end sweep-string phase */
      lua_assert(old >= g->totalbytes);
      g->estimate -= old - g->totalbytes;
      return GCSWEEPCOST;
    }
    case GCSsweep: {
      lu_mem old = g->totalbytes;
      g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX);
      if (*g->sweepgc == NULL) {  /* nothing more to sweep? */
        checkSizes(L);
        g->gcstate = GCSfinalize;  /* end sweep phase */
      }
      lua_assert(old >= g->totalbytes);
      g->estimate -= old - g->totalbytes;
      return GCSWEEPMAX*GCSWEEPCOST;
    }
    case GCSfinalize: {
      if (g->tmudata) {
        GCTM(L);
        if (g->estimate > GCFINALIZECOST)
          g->estimate -= GCFINALIZECOST;
        return GCFINALIZECOST;
      }
      else {
        g->gcstate = GCSpause;  /* end collection */
        g->gcdept = 0;
        return 0;
      }
    }
    default: lua_assert(0); return 0;
  }
}


void luaC_step (lua_State *L) {
  global_State *g = G(L);
  l_mem lim = (GCSTEPSIZE/100) * g->gcstepmul;
  if (lim == 0)
    lim = (MAX_LUMEM-1)/2;  /* no limit */
  g->gcdept += g->totalbytes - g->GCthreshold;
  do {
    lim -= singlestep(L);
    if (g->gcstate == GCSpause)
      break;
  } while (lim > 0);
  if (g->gcstate != GCSpause) {
    if (g->gcdept < GCSTEPSIZE)
      g->GCthreshold = g->totalbytes + GCSTEPSIZE;  /* - lim/g->gcstepmul;*/
    else {
      g->gcdept -= GCSTEPSIZE;
      g->GCthreshold = g->totalbytes;
    }
  }
  else {
    lua_assert(g->totalbytes >= g->estimate);
    setthreshold(g);
  }
}


void luaC_fullgc (lua_State *L) {
  global_State *g = G(L);
  if (g->gcstate <= GCSpropagate) {
    /* reset sweep marks to sweep all elements (returning them to white) */
    g->sweepstrgc = 0;
    g->sweepgc = &g->rootgc;
    /* reset other collector lists */
    g->gray = NULL;
    g->grayagain = NULL;
    g->weak = NULL;
    g->gcstate = GCSsweepstring;
  }
  lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate);
  /* finish any pending sweep phase */
  while (g->gcstate != GCSfinalize) {
    lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);
    singlestep(L);
  }
  markroot(L);
  while (g->gcstate != GCSpause) {
    singlestep(L);
  }
  setthreshold(g);
}


void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
  global_State *g = G(L);
  lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
  lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
  lua_assert(ttype(&o->gch) != LUA_TTABLE);
  /* must keep invariant? */
  if (g->gcstate == GCSpropagate)
    reallymarkobject(g, v);  /* restore invariant */
  else  /* don't mind */
    makewhite(g, o);  /* mark as white just to avoid other barriers */
}


void luaC_barrierback (lua_State *L, Table *t) {
  global_State *g = G(L);
  GCObject *o = obj2gco(t);
  lua_assert(isblack(o) && !isdead(g, o));
  lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
  black2gray(o);  /* make table gray (again) */
  t->gclist = g->grayagain;
  g->grayagain = o;
}


void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
  global_State *g = G(L);
  o->gch.next = g->rootgc;
  g->rootgc = o;
  o->gch.marked = luaC_white(g);
  o->gch.tt = tt;
}


void luaC_linkupval (lua_State *L, UpVal *uv) {
  global_State *g = G(L);
  GCObject *o = obj2gco(uv);
  o->gch.next = g->rootgc;  /* link upvalue into `rootgc' list */
  g->rootgc = o;
  if (isgray(o)) { 
    if (g->gcstate == GCSpropagate) {
      gray2black(o);  /* closed upvalues need barrier */
      luaC_barrier(L, uv, uv->v);
    }
    else {  /* sweep phase: sweep it (turning it into white) */
      makewhite(g, o);
      lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
    }
  }
}
generated by cgit v1.1 at 2026-05-08 09:44:05 +0000