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