From 637177eb1397ef1800027bccd50dbdc1af29a15b Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Mon, 13 Jan 2014 21:08:31 +1000
Subject: Remove LuaJIT source, we can use packaged LuaJIT 2.0 release now.

Also some cleanups related to the other library removals.
---
 libraries/luajit-2.0/src/lj_gc.c | 838 ---------------------------------------
 1 file changed, 838 deletions(-)
 delete mode 100644 libraries/luajit-2.0/src/lj_gc.c

(limited to 'libraries/luajit-2.0/src/lj_gc.c')

diff --git a/libraries/luajit-2.0/src/lj_gc.c b/libraries/luajit-2.0/src/lj_gc.c
deleted file mode 100644
index 1985abc..0000000
--- a/libraries/luajit-2.0/src/lj_gc.c
+++ /dev/null
@@ -1,838 +0,0 @@
-/*
-** Garbage collector.
-** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
-**
-** Major portions taken verbatim or adapted from the Lua interpreter.
-** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
-*/
-
-#define lj_gc_c
-#define LUA_CORE
-
-#include "lj_obj.h"
-#include "lj_gc.h"
-#include "lj_err.h"
-#include "lj_str.h"
-#include "lj_tab.h"
-#include "lj_func.h"
-#include "lj_udata.h"
-#include "lj_meta.h"
-#include "lj_state.h"
-#include "lj_frame.h"
-#if LJ_HASFFI
-#include "lj_ctype.h"
-#include "lj_cdata.h"
-#endif
-#include "lj_trace.h"
-#include "lj_vm.h"
-
-#define GCSTEPSIZE	1024u
-#define GCSWEEPMAX	40
-#define GCSWEEPCOST	10
-#define GCFINALIZECOST	100
-
-/* Macros to set GCobj colors and flags. */
-#define white2gray(x)		((x)->gch.marked &= (uint8_t)~LJ_GC_WHITES)
-#define gray2black(x)		((x)->gch.marked |= LJ_GC_BLACK)
-#define isfinalized(u)		((u)->marked & LJ_GC_FINALIZED)
-#define markfinalized(u)	((u)->marked |= LJ_GC_FINALIZED)
-
-/* -- Mark phase ---------------------------------------------------------- */
-
-/* Mark a TValue (if needed). */
-#define gc_marktv(g, tv) \
-  { lua_assert(!tvisgcv(tv) || (~itype(tv) == gcval(tv)->gch.gct)); \
-    if (tviswhite(tv)) gc_mark(g, gcV(tv)); }
-
-/* Mark a GCobj (if needed). */
-#define gc_markobj(g, o) \
-  { if (iswhite(obj2gco(o))) gc_mark(g, obj2gco(o)); }
-
-/* Mark a string object. */
-#define gc_mark_str(s)		((s)->marked &= (uint8_t)~LJ_GC_WHITES)
-
-/* Mark a white GCobj. */
-static void gc_mark(global_State *g, GCobj *o)
-{
-  lua_assert(iswhite(o) && !isdead(g, o));
-  white2gray(o);
-  if (LJ_UNLIKELY(o->gch.gct == ~LJ_TUDATA)) {
-    GCtab *mt = tabref(gco2ud(o)->metatable);
-    gray2black(o);  /* Userdata are never gray. */
-    if (mt) gc_markobj(g, mt);
-    gc_markobj(g, tabref(gco2ud(o)->env));
-  } else if (LJ_UNLIKELY(o->gch.gct == ~LJ_TUPVAL)) {
-    GCupval *uv = gco2uv(o);
-    gc_marktv(g, uvval(uv));
-    if (uv->closed)
-      gray2black(o);  /* Closed upvalues are never gray. */
-  } else if (o->gch.gct != ~LJ_TSTR && o->gch.gct != ~LJ_TCDATA) {
-    lua_assert(o->gch.gct == ~LJ_TFUNC || o->gch.gct == ~LJ_TTAB ||
-	       o->gch.gct == ~LJ_TTHREAD || o->gch.gct == ~LJ_TPROTO);
-    setgcrefr(o->gch.gclist, g->gc.gray);
-    setgcref(g->gc.gray, o);
-  }
-}
-
-/* Mark GC roots. */
-static void gc_mark_gcroot(global_State *g)
-{
-  ptrdiff_t i;
-  for (i = 0; i < GCROOT_MAX; i++)
-    if (gcref(g->gcroot[i]) != NULL)
-      gc_markobj(g, gcref(g->gcroot[i]));
-}
-
-/* Start a GC cycle and mark the root set. */
-static void gc_mark_start(global_State *g)
-{
-  setgcrefnull(g->gc.gray);
-  setgcrefnull(g->gc.grayagain);
-  setgcrefnull(g->gc.weak);
-  gc_markobj(g, mainthread(g));
-  gc_markobj(g, tabref(mainthread(g)->env));
-  gc_marktv(g, &g->registrytv);
-  gc_mark_gcroot(g);
-  g->gc.state = GCSpropagate;
-}
-
-/* Mark open upvalues. */
-static void gc_mark_uv(global_State *g)
-{
-  GCupval *uv;
-  for (uv = uvnext(&g->uvhead); uv != &g->uvhead; uv = uvnext(uv)) {
-    lua_assert(uvprev(uvnext(uv)) == uv && uvnext(uvprev(uv)) == uv);
-    if (isgray(obj2gco(uv)))
-      gc_marktv(g, uvval(uv));
-  }
-}
-
-/* Mark userdata in mmudata list. */
-static void gc_mark_mmudata(global_State *g)
-{
-  GCobj *root = gcref(g->gc.mmudata);
-  GCobj *u = root;
-  if (u) {
-    do {
-      u = gcnext(u);
-      makewhite(g, u);  /* Could be from previous GC. */
-      gc_mark(g, u);
-    } while (u != root);
-  }
-}
-
-/* Separate userdata which which needs finalization to mmudata list. */
-size_t lj_gc_separateudata(global_State *g, int all)
-{
-  size_t m = 0;
-  GCRef *p = &mainthread(g)->nextgc;
-  GCobj *o;
-  while ((o = gcref(*p)) != NULL) {
-    if (!(iswhite(o) || all) || isfinalized(gco2ud(o))) {
-      p = &o->gch.nextgc;  /* Nothing to do. */
-    } else if (!lj_meta_fastg(g, tabref(gco2ud(o)->metatable), MM_gc)) {
-      markfinalized(gco2ud(o));  /* Done, as there's no __gc metamethod. */
-      p = &o->gch.nextgc;
-    } else {  /* Otherwise move userdata to be finalized to mmudata list. */
-      m += sizeudata(gco2ud(o));
-      markfinalized(gco2ud(o));
-      *p = o->gch.nextgc;
-      if (gcref(g->gc.mmudata)) {  /* Link to end of mmudata list. */
-	GCobj *root = gcref(g->gc.mmudata);
-	setgcrefr(o->gch.nextgc, root->gch.nextgc);
-	setgcref(root->gch.nextgc, o);
-	setgcref(g->gc.mmudata, o);
-      } else {  /* Create circular list. */
-	setgcref(o->gch.nextgc, o);
-	setgcref(g->gc.mmudata, o);
-      }
-    }
-  }
-  return m;
-}
-
-/* -- Propagation phase --------------------------------------------------- */
-
-/* Traverse a table. */
-static int gc_traverse_tab(global_State *g, GCtab *t)
-{
-  int weak = 0;
-  cTValue *mode;
-  GCtab *mt = tabref(t->metatable);
-  if (mt)
-    gc_markobj(g, mt);
-  mode = lj_meta_fastg(g, mt, MM_mode);
-  if (mode && tvisstr(mode)) {  /* Valid __mode field? */
-    const char *modestr = strVdata(mode);
-    int c;
-    while ((c = *modestr++)) {
-      if (c == 'k') weak |= LJ_GC_WEAKKEY;
-      else if (c == 'v') weak |= LJ_GC_WEAKVAL;
-      else if (c == 'K') weak = (int)(~0u & ~LJ_GC_WEAKVAL);
-    }
-    if (weak > 0) {  /* Weak tables are cleared in the atomic phase. */
-      t->marked = (uint8_t)((t->marked & ~LJ_GC_WEAK) | weak);
-      setgcrefr(t->gclist, g->gc.weak);
-      setgcref(g->gc.weak, obj2gco(t));
-    }
-  }
-  if (weak == LJ_GC_WEAK)  /* Nothing to mark if both keys/values are weak. */
-    return 1;
-  if (!(weak & LJ_GC_WEAKVAL)) {  /* Mark array part. */
-    MSize i, asize = t->asize;
-    for (i = 0; i < asize; i++)
-      gc_marktv(g, arrayslot(t, i));
-  }
-  if (t->hmask > 0) {  /* Mark hash part. */
-    Node *node = noderef(t->node);
-    MSize i, hmask = t->hmask;
-    for (i = 0; i <= hmask; i++) {
-      Node *n = &node[i];
-      if (!tvisnil(&n->val)) {  /* Mark non-empty slot. */
-	lua_assert(!tvisnil(&n->key));
-	if (!(weak & LJ_GC_WEAKKEY)) gc_marktv(g, &n->key);
-	if (!(weak & LJ_GC_WEAKVAL)) gc_marktv(g, &n->val);
-      }
-    }
-  }
-  return weak;
-}
-
-/* Traverse a function. */
-static void gc_traverse_func(global_State *g, GCfunc *fn)
-{
-  gc_markobj(g, tabref(fn->c.env));
-  if (isluafunc(fn)) {
-    uint32_t i;
-    lua_assert(fn->l.nupvalues <= funcproto(fn)->sizeuv);
-    gc_markobj(g, funcproto(fn));
-    for (i = 0; i < fn->l.nupvalues; i++)  /* Mark Lua function upvalues. */
-      gc_markobj(g, &gcref(fn->l.uvptr[i])->uv);
-  } else {
-    uint32_t i;
-    for (i = 0; i < fn->c.nupvalues; i++)  /* Mark C function upvalues. */
-      gc_marktv(g, &fn->c.upvalue[i]);
-  }
-}
-
-#if LJ_HASJIT
-/* Mark a trace. */
-static void gc_marktrace(global_State *g, TraceNo traceno)
-{
-  GCobj *o = obj2gco(traceref(G2J(g), traceno));
-  lua_assert(traceno != G2J(g)->cur.traceno);
-  if (iswhite(o)) {
-    white2gray(o);
-    setgcrefr(o->gch.gclist, g->gc.gray);
-    setgcref(g->gc.gray, o);
-  }
-}
-
-/* Traverse a trace. */
-static void gc_traverse_trace(global_State *g, GCtrace *T)
-{
-  IRRef ref;
-  if (T->traceno == 0) return;
-  for (ref = T->nk; ref < REF_TRUE; ref++) {
-    IRIns *ir = &T->ir[ref];
-    if (ir->o == IR_KGC)
-      gc_markobj(g, ir_kgc(ir));
-  }
-  if (T->link) gc_marktrace(g, T->link);
-  if (T->nextroot) gc_marktrace(g, T->nextroot);
-  if (T->nextside) gc_marktrace(g, T->nextside);
-  gc_markobj(g, gcref(T->startpt));
-}
-
-/* The current trace is a GC root while not anchored in the prototype (yet). */
-#define gc_traverse_curtrace(g)	gc_traverse_trace(g, &G2J(g)->cur)
-#else
-#define gc_traverse_curtrace(g)	UNUSED(g)
-#endif
-
-/* Traverse a prototype. */
-static void gc_traverse_proto(global_State *g, GCproto *pt)
-{
-  ptrdiff_t i;
-  gc_mark_str(proto_chunkname(pt));
-  for (i = -(ptrdiff_t)pt->sizekgc; i < 0; i++)  /* Mark collectable consts. */
-    gc_markobj(g, proto_kgc(pt, i));
-#if LJ_HASJIT
-  if (pt->trace) gc_marktrace(g, pt->trace);
-#endif
-}
-
-/* Traverse the frame structure of a stack. */
-static MSize gc_traverse_frames(global_State *g, lua_State *th)
-{
-  TValue *frame, *top = th->top-1, *bot = tvref(th->stack);
-  /* Note: extra vararg frame not skipped, marks function twice (harmless). */
-  for (frame = th->base-1; frame > bot; frame = frame_prev(frame)) {
-    GCfunc *fn = frame_func(frame);
-    TValue *ftop = frame;
-    if (isluafunc(fn)) ftop += funcproto(fn)->framesize;
-    if (ftop > top) top = ftop;
-    gc_markobj(g, fn);  /* Need to mark hidden function (or L). */
-  }
-  top++;  /* Correct bias of -1 (frame == base-1). */
-  if (top > tvref(th->maxstack)) top = tvref(th->maxstack);
-  return (MSize)(top - bot);  /* Return minimum needed stack size. */
-}
-
-/* Traverse a thread object. */
-static void gc_traverse_thread(global_State *g, lua_State *th)
-{
-  TValue *o, *top = th->top;
-  for (o = tvref(th->stack)+1; o < top; o++)
-    gc_marktv(g, o);
-  if (g->gc.state == GCSatomic) {
-    top = tvref(th->stack) + th->stacksize;
-    for (; o < top; o++)  /* Clear unmarked slots. */
-      setnilV(o);
-  }
-  gc_markobj(g, tabref(th->env));
-  lj_state_shrinkstack(th, gc_traverse_frames(g, th));
-}
-
-/* Propagate one gray object. Traverse it and turn it black. */
-static size_t propagatemark(global_State *g)
-{
-  GCobj *o = gcref(g->gc.gray);
-  lua_assert(isgray(o));
-  gray2black(o);
-  setgcrefr(g->gc.gray, o->gch.gclist);  /* Remove from gray list. */
-  if (LJ_LIKELY(o->gch.gct == ~LJ_TTAB)) {
-    GCtab *t = gco2tab(o);
-    if (gc_traverse_tab(g, t) > 0)
-      black2gray(o);  /* Keep weak tables gray. */
-    return sizeof(GCtab) + sizeof(TValue) * t->asize +
-			   sizeof(Node) * (t->hmask + 1);
-  } else if (LJ_LIKELY(o->gch.gct == ~LJ_TFUNC)) {
-    GCfunc *fn = gco2func(o);
-    gc_traverse_func(g, fn);
-    return isluafunc(fn) ? sizeLfunc((MSize)fn->l.nupvalues) :
-			   sizeCfunc((MSize)fn->c.nupvalues);
-  } else if (LJ_LIKELY(o->gch.gct == ~LJ_TPROTO)) {
-    GCproto *pt = gco2pt(o);
-    gc_traverse_proto(g, pt);
-    return pt->sizept;
-  } else if (LJ_LIKELY(o->gch.gct == ~LJ_TTHREAD)) {
-    lua_State *th = gco2th(o);
-    setgcrefr(th->gclist, g->gc.grayagain);
-    setgcref(g->gc.grayagain, o);
-    black2gray(o);  /* Threads are never black. */
-    gc_traverse_thread(g, th);
-    return sizeof(lua_State) + sizeof(TValue) * th->stacksize;
-  } else {
-#if LJ_HASJIT
-    GCtrace *T = gco2trace(o);
-    gc_traverse_trace(g, T);
-    return ((sizeof(GCtrace)+7)&~7) + (T->nins-T->nk)*sizeof(IRIns) +
-	   T->nsnap*sizeof(SnapShot) + T->nsnapmap*sizeof(SnapEntry);
-#else
-    lua_assert(0);
-    return 0;
-#endif
-  }
-}
-
-/* Propagate all gray objects. */
-static size_t gc_propagate_gray(global_State *g)
-{
-  size_t m = 0;
-  while (gcref(g->gc.gray) != NULL)
-    m += propagatemark(g);
-  return m;
-}
-
-/* -- Sweep phase --------------------------------------------------------- */
-
-/* Try to shrink some common data structures. */
-static void gc_shrink(global_State *g, lua_State *L)
-{
-  if (g->strnum <= (g->strmask >> 2) && g->strmask > LJ_MIN_STRTAB*2-1)
-    lj_str_resize(L, g->strmask >> 1);  /* Shrink string table. */
-  if (g->tmpbuf.sz > LJ_MIN_SBUF*2)
-    lj_str_resizebuf(L, &g->tmpbuf, g->tmpbuf.sz >> 1);  /* Shrink temp buf. */
-}
-
-/* Type of GC free functions. */
-typedef void (LJ_FASTCALL *GCFreeFunc)(global_State *g, GCobj *o);
-
-/* GC free functions for LJ_TSTR .. LJ_TUDATA. ORDER LJ_T */
-static const GCFreeFunc gc_freefunc[] = {
-  (GCFreeFunc)lj_str_free,
-  (GCFreeFunc)lj_func_freeuv,
-  (GCFreeFunc)lj_state_free,
-  (GCFreeFunc)lj_func_freeproto,
-  (GCFreeFunc)lj_func_free,
-#if LJ_HASJIT
-  (GCFreeFunc)lj_trace_free,
-#else
-  (GCFreeFunc)0,
-#endif
-#if LJ_HASFFI
-  (GCFreeFunc)lj_cdata_free,
-#else
-  (GCFreeFunc)0,
-#endif
-  (GCFreeFunc)lj_tab_free,
-  (GCFreeFunc)lj_udata_free
-};
-
-/* Full sweep of a GC list. */
-#define gc_fullsweep(g, p)	gc_sweep(g, (p), LJ_MAX_MEM)
-
-/* Partial sweep of a GC list. */
-static GCRef *gc_sweep(global_State *g, GCRef *p, uint32_t lim)
-{
-  /* Mask with other white and LJ_GC_FIXED. Or LJ_GC_SFIXED on shutdown. */
-  int ow = otherwhite(g);
-  GCobj *o;
-  while ((o = gcref(*p)) != NULL && lim-- > 0) {
-    if (o->gch.gct == ~LJ_TTHREAD)  /* Need to sweep open upvalues, too. */
-      gc_fullsweep(g, &gco2th(o)->openupval);
-    if (((o->gch.marked ^ LJ_GC_WHITES) & ow)) {  /* Black or current white? */
-      lua_assert(!isdead(g, o) || (o->gch.marked & LJ_GC_FIXED));
-      makewhite(g, o);  /* Value is alive, change to the current white. */
-      p = &o->gch.nextgc;
-    } else {  /* Otherwise value is dead, free it. */
-      lua_assert(isdead(g, o) || ow == LJ_GC_SFIXED);
-      setgcrefr(*p, o->gch.nextgc);
-      if (o == gcref(g->gc.root))
-	setgcrefr(g->gc.root, o->gch.nextgc);  /* Adjust list anchor. */
-      gc_freefunc[o->gch.gct - ~LJ_TSTR](g, o);
-    }
-  }
-  return p;
-}
-
-/* Check whether we can clear a key or a value slot from a table. */
-static int gc_mayclear(cTValue *o, int val)
-{
-  if (tvisgcv(o)) {  /* Only collectable objects can be weak references. */
-    if (tvisstr(o)) {  /* But strings cannot be used as weak references. */
-      gc_mark_str(strV(o));  /* And need to be marked. */
-      return 0;
-    }
-    if (iswhite(gcV(o)))
-      return 1;  /* Object is about to be collected. */
-    if (tvisudata(o) && val && isfinalized(udataV(o)))
-      return 1;  /* Finalized userdata is dropped only from values. */
-  }
-  return 0;  /* Cannot clear. */
-}
-
-/* Clear collected entries from weak tables. */
-static void gc_clearweak(GCobj *o)
-{
-  while (o) {
-    GCtab *t = gco2tab(o);
-    lua_assert((t->marked & LJ_GC_WEAK));
-    if ((t->marked & LJ_GC_WEAKVAL)) {
-      MSize i, asize = t->asize;
-      for (i = 0; i < asize; i++) {
-	/* Clear array slot when value is about to be collected. */
-	TValue *tv = arrayslot(t, i);
-	if (gc_mayclear(tv, 1))
-	  setnilV(tv);
-      }
-    }
-    if (t->hmask > 0) {
-      Node *node = noderef(t->node);
-      MSize i, hmask = t->hmask;
-      for (i = 0; i <= hmask; i++) {
-	Node *n = &node[i];
-	/* Clear hash slot when key or value is about to be collected. */
-	if (!tvisnil(&n->val) && (gc_mayclear(&n->key, 0) ||
-				  gc_mayclear(&n->val, 1)))
-	  setnilV(&n->val);
-      }
-    }
-    o = gcref(t->gclist);
-  }
-}
-
-/* Call a userdata or cdata finalizer. */
-static void gc_call_finalizer(global_State *g, lua_State *L,
-			      cTValue *mo, GCobj *o)
-{
-  /* Save and restore lots of state around the __gc callback. */
-  uint8_t oldh = hook_save(g);
-  MSize oldt = g->gc.threshold;
-  int errcode;
-  TValue *top;
-  lj_trace_abort(g);
-  top = L->top;
-  L->top = top+2;
-  hook_entergc(g);  /* Disable hooks and new traces during __gc. */
-  g->gc.threshold = LJ_MAX_MEM;  /* Prevent GC steps. */
-  copyTV(L, top, mo);
-  setgcV(L, top+1, o, ~o->gch.gct);
-  errcode = lj_vm_pcall(L, top+1, 1+0, -1);  /* Stack: |mo|o| -> | */
-  hook_restore(g, oldh);
-  g->gc.threshold = oldt;  /* Restore GC threshold. */
-  if (errcode)
-    lj_err_throw(L, errcode);  /* Propagate errors. */
-}
-
-/* Finalize one userdata or cdata object from the mmudata list. */
-static void gc_finalize(lua_State *L)
-{
-  global_State *g = G(L);
-  GCobj *o = gcnext(gcref(g->gc.mmudata));
-  cTValue *mo;
-  lua_assert(gcref(g->jit_L) == NULL);  /* Must not be called on trace. */
-  /* Unchain from list of userdata to be finalized. */
-  if (o == gcref(g->gc.mmudata))
-    setgcrefnull(g->gc.mmudata);
-  else
-    setgcrefr(gcref(g->gc.mmudata)->gch.nextgc, o->gch.nextgc);
-#if LJ_HASFFI
-  if (o->gch.gct == ~LJ_TCDATA) {
-    TValue tmp, *tv;
-    /* Add cdata back to the GC list and make it white. */
-    setgcrefr(o->gch.nextgc, g->gc.root);
-    setgcref(g->gc.root, o);
-    makewhite(g, o);
-    o->gch.marked &= (uint8_t)~LJ_GC_CDATA_FIN;
-    /* Resolve finalizer. */
-    setcdataV(L, &tmp, gco2cd(o));
-    tv = lj_tab_set(L, ctype_ctsG(g)->finalizer, &tmp);
-    if (!tvisnil(tv)) {
-      copyTV(L, &tmp, tv);
-      setnilV(tv);  /* Clear entry in finalizer table. */
-      gc_call_finalizer(g, L, &tmp, o);
-    }
-    return;
-  }
-#endif
-  /* Add userdata back to the main userdata list and make it white. */
-  setgcrefr(o->gch.nextgc, mainthread(g)->nextgc);
-  setgcref(mainthread(g)->nextgc, o);
-  makewhite(g, o);
-  /* Resolve the __gc metamethod. */
-  mo = lj_meta_fastg(g, tabref(gco2ud(o)->metatable), MM_gc);
-  if (mo)
-    gc_call_finalizer(g, L, mo, o);
-}
-
-/* Finalize all userdata objects from mmudata list. */
-void lj_gc_finalize_udata(lua_State *L)
-{
-  while (gcref(G(L)->gc.mmudata) != NULL)
-    gc_finalize(L);
-}
-
-#if LJ_HASFFI
-/* Finalize all cdata objects from finalizer table. */
-void lj_gc_finalize_cdata(lua_State *L)
-{
-  global_State *g = G(L);
-  CTState *cts = ctype_ctsG(g);
-  if (cts) {
-    GCtab *t = cts->finalizer;
-    Node *node = noderef(t->node);
-    ptrdiff_t i;
-    setgcrefnull(t->metatable);  /* Mark finalizer table as disabled. */
-    for (i = (ptrdiff_t)t->hmask; i >= 0; i--)
-      if (!tvisnil(&node[i].val) && tviscdata(&node[i].key)) {
-	GCobj *o = gcV(&node[i].key);
-	TValue tmp;
-	makewhite(g, o);
-	o->gch.marked &= (uint8_t)~LJ_GC_CDATA_FIN;
-	copyTV(L, &tmp, &node[i].val);
-	setnilV(&node[i].val);
-	gc_call_finalizer(g, L, &tmp, o);
-      }
-  }
-}
-#endif
-
-/* Free all remaining GC objects. */
-void lj_gc_freeall(global_State *g)
-{
-  MSize i, strmask;
-  /* Free everything, except super-fixed objects (the main thread). */
-  g->gc.currentwhite = LJ_GC_WHITES | LJ_GC_SFIXED;
-  gc_fullsweep(g, &g->gc.root);
-  strmask = g->strmask;
-  for (i = 0; i <= strmask; i++)  /* Free all string hash chains. */
-    gc_fullsweep(g, &g->strhash[i]);
-}
-
-/* -- Collector ----------------------------------------------------------- */
-
-/* Atomic part of the GC cycle, transitioning from mark to sweep phase. */
-static void atomic(global_State *g, lua_State *L)
-{
-  size_t udsize;
-
-  gc_mark_uv(g);  /* Need to remark open upvalues (the thread may be dead). */
-  gc_propagate_gray(g);  /* Propagate any left-overs. */
-
-  setgcrefr(g->gc.gray, g->gc.weak);  /* Empty the list of weak tables. */
-  setgcrefnull(g->gc.weak);
-  lua_assert(!iswhite(obj2gco(mainthread(g))));
-  gc_markobj(g, L);  /* Mark running thread. */
-  gc_traverse_curtrace(g);  /* Traverse current trace. */
-  gc_mark_gcroot(g);  /* Mark GC roots (again). */
-  gc_propagate_gray(g);  /* Propagate all of the above. */
-
-  setgcrefr(g->gc.gray, g->gc.grayagain);  /* Empty the 2nd chance list. */
-  setgcrefnull(g->gc.grayagain);
-  gc_propagate_gray(g);  /* Propagate it. */
-
-  udsize = lj_gc_separateudata(g, 0);  /* Separate userdata to be finalized. */
-  gc_mark_mmudata(g);  /* Mark them. */
-  udsize += gc_propagate_gray(g);  /* And propagate the marks. */
-
-  /* All marking done, clear weak tables. */
-  gc_clearweak(gcref(g->gc.weak));
-
-  /* Prepare for sweep phase. */
-  g->gc.currentwhite = (uint8_t)otherwhite(g);  /* Flip current white. */
-  g->strempty.marked = g->gc.currentwhite;
-  setmref(g->gc.sweep, &g->gc.root);
-  g->gc.estimate = g->gc.total - (MSize)udsize;  /* Initial estimate. */
-}
-
-/* GC state machine. Returns a cost estimate for each step performed. */
-static size_t gc_onestep(lua_State *L)
-{
-  global_State *g = G(L);
-  switch (g->gc.state) {
-  case GCSpause:
-    gc_mark_start(g);  /* Start a new GC cycle by marking all GC roots. */
-    return 0;
-  case GCSpropagate:
-    if (gcref(g->gc.gray) != NULL)
-      return propagatemark(g);  /* Propagate one gray object. */
-    g->gc.state = GCSatomic;  /* End of mark phase. */
-    return 0;
-  case GCSatomic:
-    if (gcref(g->jit_L))  /* Don't run atomic phase on trace. */
-      return LJ_MAX_MEM;
-    atomic(g, L);
-    g->gc.state = GCSsweepstring;  /* Start of sweep phase. */
-    g->gc.sweepstr = 0;
-    return 0;
-  case GCSsweepstring: {
-    MSize old = g->gc.total;
-    gc_fullsweep(g, &g->strhash[g->gc.sweepstr++]);  /* Sweep one chain. */
-    if (g->gc.sweepstr > g->strmask)
-      g->gc.state = GCSsweep;  /* All string hash chains sweeped. */
-    lua_assert(old >= g->gc.total);
-    g->gc.estimate -= old - g->gc.total;
-    return GCSWEEPCOST;
-    }
-  case GCSsweep: {
-    MSize old = g->gc.total;
-    setmref(g->gc.sweep, gc_sweep(g, mref(g->gc.sweep, GCRef), GCSWEEPMAX));
-    if (gcref(*mref(g->gc.sweep, GCRef)) == NULL) {
-      gc_shrink(g, L);
-      if (gcref(g->gc.mmudata)) {  /* Need any finalizations? */
-	g->gc.state = GCSfinalize;
-      } else {  /* Otherwise skip this phase to help the JIT. */
-	g->gc.state = GCSpause;  /* End of GC cycle. */
-	g->gc.debt = 0;
-      }
-    }
-    lua_assert(old >= g->gc.total);
-    g->gc.estimate -= old - g->gc.total;
-    return GCSWEEPMAX*GCSWEEPCOST;
-    }
-  case GCSfinalize:
-    if (gcref(g->gc.mmudata) != NULL) {
-      if (gcref(g->jit_L))  /* Don't call finalizers on trace. */
-	return LJ_MAX_MEM;
-      gc_finalize(L);  /* Finalize one userdata object. */
-      if (g->gc.estimate > GCFINALIZECOST)
-	g->gc.estimate -= GCFINALIZECOST;
-      return GCFINALIZECOST;
-    }
-    g->gc.state = GCSpause;  /* End of GC cycle. */
-    g->gc.debt = 0;
-    return 0;
-  default:
-    lua_assert(0);
-    return 0;
-  }
-}
-
-/* Perform a limited amount of incremental GC steps. */
-int LJ_FASTCALL lj_gc_step(lua_State *L)
-{
-  global_State *g = G(L);
-  MSize lim;
-  int32_t ostate = g->vmstate;
-  setvmstate(g, GC);
-  lim = (GCSTEPSIZE/100) * g->gc.stepmul;
-  if (lim == 0)
-    lim = LJ_MAX_MEM;
-  g->gc.debt += g->gc.total - g->gc.threshold;
-  do {
-    lim -= (MSize)gc_onestep(L);
-    if (g->gc.state == GCSpause) {
-      g->gc.threshold = (g->gc.estimate/100) * g->gc.pause;
-      g->vmstate = ostate;
-      return 1;  /* Finished a GC cycle. */
-    }
-  } while ((int32_t)lim > 0);
-  if (g->gc.debt < GCSTEPSIZE) {
-    g->gc.threshold = g->gc.total + GCSTEPSIZE;
-  } else {
-    g->gc.debt -= GCSTEPSIZE;
-    g->gc.threshold = g->gc.total;
-  }
-  g->vmstate = ostate;
-  return 0;
-}
-
-/* Ditto, but fix the stack top first. */
-void LJ_FASTCALL lj_gc_step_fixtop(lua_State *L)
-{
-  if (curr_funcisL(L)) L->top = curr_topL(L);
-  lj_gc_step(L);
-}
-
-#if LJ_HASJIT
-/* Perform multiple GC steps. Called from JIT-compiled code. */
-int LJ_FASTCALL lj_gc_step_jit(global_State *g, MSize steps)
-{
-  lua_State *L = gco2th(gcref(g->jit_L));
-  L->base = mref(G(L)->jit_base, TValue);
-  L->top = curr_topL(L);
-  while (steps-- > 0 && lj_gc_step(L) == 0)
-    ;
-  /* Return 1 to force a trace exit. */
-  return (G(L)->gc.state == GCSatomic || G(L)->gc.state == GCSfinalize);
-}
-#endif
-
-/* Perform a full GC cycle. */
-void lj_gc_fullgc(lua_State *L)
-{
-  global_State *g = G(L);
-  int32_t ostate = g->vmstate;
-  setvmstate(g, GC);
-  if (g->gc.state <= GCSatomic) {  /* Caught somewhere in the middle. */
-    setmref(g->gc.sweep, &g->gc.root);  /* Sweep everything (preserving it). */
-    setgcrefnull(g->gc.gray);  /* Reset lists from partial propagation. */
-    setgcrefnull(g->gc.grayagain);
-    setgcrefnull(g->gc.weak);
-    g->gc.state = GCSsweepstring;  /* Fast forward to the sweep phase. */
-    g->gc.sweepstr = 0;
-  }
-  while (g->gc.state == GCSsweepstring || g->gc.state == GCSsweep)
-    gc_onestep(L);  /* Finish sweep. */
-  lua_assert(g->gc.state == GCSfinalize || g->gc.state == GCSpause);
-  /* Now perform a full GC. */
-  g->gc.state = GCSpause;
-  do { gc_onestep(L); } while (g->gc.state != GCSpause);
-  g->gc.threshold = (g->gc.estimate/100) * g->gc.pause;
-  g->vmstate = ostate;
-}
-
-/* -- Write barriers ------------------------------------------------------ */
-
-/* Move the GC propagation frontier forward. */
-void lj_gc_barrierf(global_State *g, GCobj *o, GCobj *v)
-{
-  lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
-  lua_assert(g->gc.state != GCSfinalize && g->gc.state != GCSpause);
-  lua_assert(o->gch.gct != ~LJ_TTAB);
-  /* Preserve invariant during propagation. Otherwise it doesn't matter. */
-  if (g->gc.state == GCSpropagate || g->gc.state == GCSatomic)
-    gc_mark(g, v);  /* Move frontier forward. */
-  else
-    makewhite(g, o);  /* Make it white to avoid the following barrier. */
-}
-
-/* Specialized barrier for closed upvalue. Pass &uv->tv. */
-void LJ_FASTCALL lj_gc_barrieruv(global_State *g, TValue *tv)
-{
-#define TV2MARKED(x) \
-  (*((uint8_t *)(x) - offsetof(GCupval, tv) + offsetof(GCupval, marked)))
-  if (g->gc.state == GCSpropagate || g->gc.state == GCSatomic)
-    gc_mark(g, gcV(tv));
-  else
-    TV2MARKED(tv) = (TV2MARKED(tv) & (uint8_t)~LJ_GC_COLORS) | curwhite(g);
-#undef TV2MARKED
-}
-
-/* Close upvalue. Also needs a write barrier. */
-void lj_gc_closeuv(global_State *g, GCupval *uv)
-{
-  GCobj *o = obj2gco(uv);
-  /* Copy stack slot to upvalue itself and point to the copy. */
-  copyTV(mainthread(g), &uv->tv, uvval(uv));
-  setmref(uv->v, &uv->tv);
-  uv->closed = 1;
-  setgcrefr(o->gch.nextgc, g->gc.root);
-  setgcref(g->gc.root, o);
-  if (isgray(o)) {  /* A closed upvalue is never gray, so fix this. */
-    if (g->gc.state == GCSpropagate || g->gc.state == GCSatomic) {
-      gray2black(o);  /* Make it black and preserve invariant. */
-      if (tviswhite(&uv->tv))
-	lj_gc_barrierf(g, o, gcV(&uv->tv));
-    } else {
-      makewhite(g, o);  /* Make it white, i.e. sweep the upvalue. */
-      lua_assert(g->gc.state != GCSfinalize && g->gc.state != GCSpause);
-    }
-  }
-}
-
-#if LJ_HASJIT
-/* Mark a trace if it's saved during the propagation phase. */
-void lj_gc_barriertrace(global_State *g, uint32_t traceno)
-{
-  if (g->gc.state == GCSpropagate || g->gc.state == GCSatomic)
-    gc_marktrace(g, traceno);
-}
-#endif
-
-/* -- Allocator ----------------------------------------------------------- */
-
-/* Call pluggable memory allocator to allocate or resize a fragment. */
-void *lj_mem_realloc(lua_State *L, void *p, MSize osz, MSize nsz)
-{
-  global_State *g = G(L);
-  lua_assert((osz == 0) == (p == NULL));
-  p = g->allocf(g->allocd, p, osz, nsz);
-  if (p == NULL && nsz > 0)
-    lj_err_mem(L);
-  lua_assert((nsz == 0) == (p == NULL));
-  lua_assert(checkptr32(p));
-  g->gc.total = (g->gc.total - osz) + nsz;
-  return p;
-}
-
-/* Allocate new GC object and link it to the root set. */
-void * LJ_FASTCALL lj_mem_newgco(lua_State *L, MSize size)
-{
-  global_State *g = G(L);
-  GCobj *o = (GCobj *)g->allocf(g->allocd, NULL, 0, size);
-  if (o == NULL)
-    lj_err_mem(L);
-  lua_assert(checkptr32(o));
-  g->gc.total += size;
-  setgcrefr(o->gch.nextgc, g->gc.root);
-  setgcref(g->gc.root, o);
-  newwhite(g, o);
-  return o;
-}
-
-/* Resize growable vector. */
-void *lj_mem_grow(lua_State *L, void *p, MSize *szp, MSize lim, MSize esz)
-{
-  MSize sz = (*szp) << 1;
-  if (sz < LJ_MIN_VECSZ)
-    sz = LJ_MIN_VECSZ;
-  if (sz > lim)
-    sz = lim;
-  p = lj_mem_realloc(L, p, (*szp)*esz, sz*esz);
-  *szp = sz;
-  return p;
-}
-
-- 
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