/*** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 roberto Exp $** Garbage Collector** See Copyright Notice in lua.h*/#ifndef lgc_h#define lgc_h#include "lobject.h"/*** Possible states of the Garbage Collector*/#define GCSpause	0#define GCSpropagate	1#define GCSsweepstring	2#define GCSsweep	3#define GCSfinalize	4/*** some userful bit tricks*/#define resetbits(x,m)	((x) &= cast(lu_byte, ~(m)))#define setbits(x,m)	((x) |= (m))#define testbits(x,m)	((x) & (m))#define bitmask(b)	(1<<(b))#define bit2mask(b1,b2)	(bitmask(b1) | bitmask(b2))#define l_setbit(x,b)	setbits(x, bitmask(b))#define resetbit(x,b)	resetbits(x, bitmask(b))#define testbit(x,b)	testbits(x, bitmask(b))#define set2bits(x,b1,b2)	setbits(x, (bit2mask(b1, b2)))#define reset2bits(x,b1,b2)	resetbits(x, (bit2mask(b1, b2)))#define test2bits(x,b1,b2)	testbits(x, (bit2mask(b1, b2)))/*** Layout for bit use in `marked' field:** bit 0 - object is white (type 0)** bit 1 - object is white (type 1)** bit 2 - object is black** bit 3 - for userdata: has been finalized** bit 3 - for tables: has weak keys** bit 4 - for tables: has weak values** bit 5 - object is fixed (should not be collected)** bit 6 - object is "super" fixed (only the main thread)*/#define WHITE0BIT	0#define WHITE1BIT	1#define BLACKBIT	2#define FINALIZEDBIT	3#define KEYWEAKBIT	3#define VALUEWEAKBIT	4#define FIXEDBIT	5#define SFIXEDBIT	6#define WHITEBITS	bit2mask(WHITE0BIT, WHITE1BIT)#define iswhite(x)      test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)#define isblack(x)      testbit((x)->gch.marked, BLACKBIT)#define isgray(x)	(!isblack(x) && !iswhite(x))#define otherwhite(g)	(g->currentwhite ^ WHITEBITS)#define isdead(g,v)	((v)->gch.marked & otherwhite(g) & WHITEBITS)#define changewhite(x)	((x)->gch.marked ^= WHITEBITS)#define gray2black(x)	l_setbit((x)->gch.marked, BLACKBIT)#define valiswhite(x)	(iscollectable(x) && iswhite(gcvalue(x)))#define luaC_white(g)	cast(lu_byte, (g)->currentwhite & WHITEBITS)#define luaC_checkGC(L) { \  condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \  if (G(L)->totalbytes >= G(L)->GCthreshold) \	luaC_step(L); }#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p)))  \	luaC_barrierf(L,obj2gco(p),gcvalue(v)); }#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t)))  \	luaC_barrierback(L,t); }#define luaC_objbarrier(L,p,o)  \	{ if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \		luaC_barrierf(L,obj2gco(p),obj2gco(o)); }#define luaC_objbarriert(L,t,o)  \   { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);LUAI_FUNC void luaC_callGCTM (lua_State *L);LUAI_FUNC void luaC_freeall (lua_State *L);LUAI_FUNC void luaC_step (lua_State *L);LUAI_FUNC void luaC_fullgc (lua_State *L);LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);#endif