lua51 0.1.6

Lua 5.1.5 bindings for Rust.
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/*
** $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