mirror of https://github.com/axmolengine/axmol.git
135 lines
4.8 KiB
C
135 lines
4.8 KiB
C
/*
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** Garbage collector.
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** Copyright (C) 2005-2013 Mike Pall. See Copyright Notice in luajit.h
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*/
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#ifndef _LJ_GC_H
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#define _LJ_GC_H
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#include "lj_obj.h"
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/* Garbage collector states. Order matters. */
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enum {
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GCSpause, GCSpropagate, GCSatomic, GCSsweepstring, GCSsweep, GCSfinalize
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};
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/* Bitmasks for marked field of GCobj. */
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#define LJ_GC_WHITE0 0x01
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#define LJ_GC_WHITE1 0x02
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#define LJ_GC_BLACK 0x04
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#define LJ_GC_FINALIZED 0x08
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#define LJ_GC_WEAKKEY 0x08
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#define LJ_GC_WEAKVAL 0x10
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#define LJ_GC_CDATA_FIN 0x10
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#define LJ_GC_FIXED 0x20
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#define LJ_GC_SFIXED 0x40
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#define LJ_GC_WHITES (LJ_GC_WHITE0 | LJ_GC_WHITE1)
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#define LJ_GC_COLORS (LJ_GC_WHITES | LJ_GC_BLACK)
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#define LJ_GC_WEAK (LJ_GC_WEAKKEY | LJ_GC_WEAKVAL)
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/* Macros to test and set GCobj colors. */
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#define iswhite(x) ((x)->gch.marked & LJ_GC_WHITES)
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#define isblack(x) ((x)->gch.marked & LJ_GC_BLACK)
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#define isgray(x) (!((x)->gch.marked & (LJ_GC_BLACK|LJ_GC_WHITES)))
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#define tviswhite(x) (tvisgcv(x) && iswhite(gcV(x)))
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#define otherwhite(g) (g->gc.currentwhite ^ LJ_GC_WHITES)
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#define isdead(g, v) ((v)->gch.marked & otherwhite(g) & LJ_GC_WHITES)
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#define curwhite(g) ((g)->gc.currentwhite & LJ_GC_WHITES)
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#define newwhite(g, x) (obj2gco(x)->gch.marked = (uint8_t)curwhite(g))
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#define makewhite(g, x) \
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((x)->gch.marked = ((x)->gch.marked & (uint8_t)~LJ_GC_COLORS) | curwhite(g))
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#define flipwhite(x) ((x)->gch.marked ^= LJ_GC_WHITES)
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#define black2gray(x) ((x)->gch.marked &= (uint8_t)~LJ_GC_BLACK)
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#define fixstring(s) ((s)->marked |= LJ_GC_FIXED)
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#define markfinalized(x) ((x)->gch.marked |= LJ_GC_FINALIZED)
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/* Collector. */
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LJ_FUNC size_t lj_gc_separateudata(global_State *g, int all);
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LJ_FUNC void lj_gc_finalize_udata(lua_State *L);
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#if LJ_HASFFI
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LJ_FUNC void lj_gc_finalize_cdata(lua_State *L);
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#else
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#define lj_gc_finalize_cdata(L) UNUSED(L)
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#endif
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LJ_FUNC void lj_gc_freeall(global_State *g);
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LJ_FUNCA int LJ_FASTCALL lj_gc_step(lua_State *L);
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LJ_FUNCA void LJ_FASTCALL lj_gc_step_fixtop(lua_State *L);
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#if LJ_HASJIT
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LJ_FUNC int LJ_FASTCALL lj_gc_step_jit(global_State *g, MSize steps);
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#endif
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LJ_FUNC void lj_gc_fullgc(lua_State *L);
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/* GC check: drive collector forward if the GC threshold has been reached. */
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#define lj_gc_check(L) \
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{ if (LJ_UNLIKELY(G(L)->gc.total >= G(L)->gc.threshold)) \
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lj_gc_step(L); }
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#define lj_gc_check_fixtop(L) \
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{ if (LJ_UNLIKELY(G(L)->gc.total >= G(L)->gc.threshold)) \
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lj_gc_step_fixtop(L); }
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/* Write barriers. */
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LJ_FUNC void lj_gc_barrierf(global_State *g, GCobj *o, GCobj *v);
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LJ_FUNCA void LJ_FASTCALL lj_gc_barrieruv(global_State *g, TValue *tv);
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LJ_FUNC void lj_gc_closeuv(global_State *g, GCupval *uv);
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#if LJ_HASJIT
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LJ_FUNC void lj_gc_barriertrace(global_State *g, uint32_t traceno);
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#endif
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/* Move the GC propagation frontier back for tables (make it gray again). */
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static LJ_AINLINE void lj_gc_barrierback(global_State *g, GCtab *t)
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{
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GCobj *o = obj2gco(t);
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lua_assert(isblack(o) && !isdead(g, o));
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lua_assert(g->gc.state != GCSfinalize && g->gc.state != GCSpause);
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black2gray(o);
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setgcrefr(t->gclist, g->gc.grayagain);
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setgcref(g->gc.grayagain, o);
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}
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/* Barrier for stores to table objects. TValue and GCobj variant. */
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#define lj_gc_anybarriert(L, t) \
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{ if (LJ_UNLIKELY(isblack(obj2gco(t)))) lj_gc_barrierback(G(L), (t)); }
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#define lj_gc_barriert(L, t, tv) \
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{ if (tviswhite(tv) && isblack(obj2gco(t))) \
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lj_gc_barrierback(G(L), (t)); }
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#define lj_gc_objbarriert(L, t, o) \
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{ if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) \
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lj_gc_barrierback(G(L), (t)); }
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/* Barrier for stores to any other object. TValue and GCobj variant. */
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#define lj_gc_barrier(L, p, tv) \
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{ if (tviswhite(tv) && isblack(obj2gco(p))) \
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lj_gc_barrierf(G(L), obj2gco(p), gcV(tv)); }
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#define lj_gc_objbarrier(L, p, o) \
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{ if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
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lj_gc_barrierf(G(L), obj2gco(p), obj2gco(o)); }
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/* Allocator. */
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LJ_FUNC void *lj_mem_realloc(lua_State *L, void *p, MSize osz, MSize nsz);
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LJ_FUNC void * LJ_FASTCALL lj_mem_newgco(lua_State *L, MSize size);
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LJ_FUNC void *lj_mem_grow(lua_State *L, void *p,
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MSize *szp, MSize lim, MSize esz);
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#define lj_mem_new(L, s) lj_mem_realloc(L, NULL, 0, (s))
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static LJ_AINLINE void lj_mem_free(global_State *g, void *p, size_t osize)
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{
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g->gc.total -= (MSize)osize;
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g->allocf(g->allocd, p, osize, 0);
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}
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#define lj_mem_newvec(L, n, t) ((t *)lj_mem_new(L, (MSize)((n)*sizeof(t))))
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#define lj_mem_reallocvec(L, p, on, n, t) \
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((p) = (t *)lj_mem_realloc(L, p, (on)*sizeof(t), (MSize)((n)*sizeof(t))))
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#define lj_mem_growvec(L, p, n, m, t) \
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((p) = (t *)lj_mem_grow(L, (p), &(n), (m), (MSize)sizeof(t)))
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#define lj_mem_freevec(g, p, n, t) lj_mem_free(g, (p), (n)*sizeof(t))
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#define lj_mem_newobj(L, t) ((t *)lj_mem_newgco(L, sizeof(t)))
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#define lj_mem_newt(L, s, t) ((t *)lj_mem_new(L, (s)))
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#define lj_mem_freet(g, p) lj_mem_free(g, (p), sizeof(*(p)))
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#endif
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