lgc.h
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- /*
- ** $Id: lgc.h,v 2.15 2005/08/24 16:15:49 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