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ElmerCSC
GitHub Repository: ElmerCSC/elmerfem
 Path: blob/devel/contrib/lua-5.1.5/src/lgc.h
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/*

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** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 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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