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/*
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** $Id: lgc.h,v 2.15 2005/08/24 16:15:49 roberto Exp $
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** Garbage Collector
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** See Copyright Notice in lua.h
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*/
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#ifndef lgc_h
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#define lgc_h
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#include "lobject.h"
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/*
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** Possible states of the Garbage Collector
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*/
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#define GCSpause 0
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#define GCSpropagate 1
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#define GCSsweepstring 2
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#define GCSsweep 3
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#define GCSfinalize 4
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/*
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** some userful bit tricks
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*/
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#define resetbits(x,m) ((x) &= cast(lu_byte, ~(m)))
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#define setbits(x,m) ((x) |= (m))
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#define testbits(x,m) ((x) & (m))
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#define bitmask(b) (1<<(b))
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#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
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#define l_setbit(x,b) setbits(x, bitmask(b))
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#define resetbit(x,b) resetbits(x, bitmask(b))
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#define testbit(x,b) testbits(x, bitmask(b))
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#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
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#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
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#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
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/*
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** Layout for bit use in `marked' field:
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** bit 0 - object is white (type 0)
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** bit 1 - object is white (type 1)
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** bit 2 - object is black
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** bit 3 - for userdata: has been finalized
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** bit 3 - for tables: has weak keys
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** bit 4 - for tables: has weak values
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** bit 5 - object is fixed (should not be collected)
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** bit 6 - object is "super" fixed (only the main thread)
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*/
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#define WHITE0BIT 0
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#define WHITE1BIT 1
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#define BLACKBIT 2
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#define FINALIZEDBIT 3
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#define KEYWEAKBIT 3
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#define VALUEWEAKBIT 4
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#define FIXEDBIT 5
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#define SFIXEDBIT 6
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#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
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#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
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#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
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#define isgray(x) (!isblack(x) && !iswhite(x))
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#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
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#define isdead(g,v) ((v)->gch.marked & otherwhite(g) & WHITEBITS)
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#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
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#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
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#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
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#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
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#define luaC_checkGC(L) { \
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condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
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if (G(L)->totalbytes >= G(L)->GCthreshold) \
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luaC_step(L); }
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#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
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luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
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#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t))) \
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luaC_barrierback(L,t); }
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#define luaC_objbarrier(L,p,o) \
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{ if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
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luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
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#define luaC_objbarriert(L,t,o) \
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{ if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
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LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
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LUAI_FUNC void luaC_callGCTM (lua_State *L);
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LUAI_FUNC void luaC_freeall (lua_State *L);
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LUAI_FUNC void luaC_step (lua_State *L);
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LUAI_FUNC void luaC_fullgc (lua_State *L);
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LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
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LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
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LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
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LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
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#endif
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