[redis.git] / deps / lua / src / lgc.h

/*
** $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
Commit	Line	Data
21d3294c	1	/*
	2	** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 roberto Exp $
	3	** Garbage Collector
	4	** See Copyright Notice in lua.h
	5	*/
	6
	7	#ifndef lgc_h
	8	#define lgc_h
	9
	10
	11	#include "lobject.h"
	12
	13
	14	/*
	15	** Possible states of the Garbage Collector
	16	*/
	17	#define GCSpause 0
	18	#define GCSpropagate 1
	19	#define GCSsweepstring 2
	20	#define GCSsweep 3
	21	#define GCSfinalize 4
	22
	23
	24	/*
	25	** some userful bit tricks
	26	*/
	27	#define resetbits(x,m) ((x) &= cast(lu_byte, ~(m)))
	28	#define setbits(x,m) ((x) \|= (m))
	29	#define testbits(x,m) ((x) & (m))
	30	#define bitmask(b) (1<<(b))
	31	#define bit2mask(b1,b2) (bitmask(b1) \| bitmask(b2))
	32	#define l_setbit(x,b) setbits(x, bitmask(b))
	33	#define resetbit(x,b) resetbits(x, bitmask(b))
	34	#define testbit(x,b) testbits(x, bitmask(b))
	35	#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
	36	#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
	37	#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
	38
	39
	40
	41	/*
	42	** Layout for bit use in `marked' field:
	43	** bit 0 - object is white (type 0)
	44	** bit 1 - object is white (type 1)
	45	** bit 2 - object is black
	46	** bit 3 - for userdata: has been finalized
	47	** bit 3 - for tables: has weak keys
	48	** bit 4 - for tables: has weak values
	49	** bit 5 - object is fixed (should not be collected)
	50	** bit 6 - object is "super" fixed (only the main thread)
	51	*/
	52
	53
	54	#define WHITE0BIT 0
	55	#define WHITE1BIT 1
	56	#define BLACKBIT 2
	57	#define FINALIZEDBIT 3
	58	#define KEYWEAKBIT 3
	59	#define VALUEWEAKBIT 4
	60	#define FIXEDBIT 5
	61	#define SFIXEDBIT 6
	62	#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
	63
	64
65	#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
66	#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
67	#define isgray(x) (!isblack(x) && !iswhite(x))
68
69	#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
70	#define isdead(g,v) ((v)->gch.marked & otherwhite(g) & WHITEBITS)
71
72	#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
73	#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
74
75	#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
76
77	#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
78
79
80	#define luaC_checkGC(L) { \
81	condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
82	if (G(L)->totalbytes >= G(L)->GCthreshold) \
83	luaC_step(L); }
84
85
86	#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
87	luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
88
89	#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t))) \
90	luaC_barrierback(L,t); }
91
92	#define luaC_objbarrier(L,p,o) \
93	{ if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
94	luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
95
96	#define luaC_objbarriert(L,t,o) \
97	{ if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
98
99	LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
100	LUAI_FUNC void luaC_callGCTM (lua_State *L);
101	LUAI_FUNC void luaC_freeall (lua_State *L);
102	LUAI_FUNC void luaC_step (lua_State *L);
103	LUAI_FUNC void luaC_fullgc (lua_State *L);
104	LUAI_FUNC void luaC_link (lua_State L, GCObject o, lu_byte tt);
105	LUAI_FUNC void luaC_linkupval (lua_State L, UpVal uv);
106	LUAI_FUNC void luaC_barrierf (lua_State L, GCObject o, GCObject *v);
107	LUAI_FUNC void luaC_barrierback (lua_State L, Table t);
108
109
110	#endif