# lua/lgc.h File Reference

`#include "lobject.h"`

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## Defines
#define | GCSpause 0
#define | GCSpropagate 1
#define | GCSsweepstring 2
#define | GCSsweep 3
#define | GCSfinalize 4
#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)))
#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)
#define | luaC_barrier(L, p, v)
#define | luaC_barriert(L, t, v)
#define | luaC_objbarrier(L, p, o)
#define | luaC_objbarriert(L, t, o) { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
## Functions
size_t | luaC_separateudata (lua_State *L, int all)
void | luaC_callGCTM (lua_State *L)
void | luaC_freeall (lua_State *L)
void | luaC_step (lua_State *L)
void | luaC_fullgc (lua_State *L)
void | luaC_link (lua_State *L, GCObject *o, lu_byte tt)
void | luaC_linkupval (lua_State *L, UpVal *uv)
void | luaC_barrierf (lua_State *L, GCObject *o, GCObject *v)
void | luaC_barrierback (lua_State *L, Table *t)

## Define Documentation

#define bit2mask | ( | b1,
|  | b2 |  | ) | (bitmask(b1) | bitmask(b2))

Definition at line 31 of file lgc.h.

Referenced by lua_newstate().

#define bitmask | ( | b |  | ) | (1<<(b))

Definition at line 30 of file lgc.h.

Referenced by luaC_freeall(), and sweeplist().

#define BLACKBIT 2

Definition at line 56 of file lgc.h.

#define changewhite | ( | x |  | ) | ((x)->gch.marked ^= WHITEBITS)

Definition at line 72 of file lgc.h.

Referenced by luaF_findupval(), and luaS_newlstr().

#define FINALIZEDBIT 3

Definition at line 57 of file lgc.h.

#define FIXEDBIT 5

Definition at line 60 of file lgc.h.

Referenced by lua_newstate(), and sweeplist().

#define GCSfinalize 4

Definition at line 21 of file lgc.h.

Referenced by luaC_barrierback(), luaC_barrierf(), luaC_fullgc(), luaC_linkupval(), and singlestep().

#define GCSpause 0

Definition at line 17 of file lgc.h.

Referenced by lua_gc(), lua_newstate(), luaC_barrierback(), luaC_barrierf(), luaC_fullgc(), luaC_linkupval(), luaC_step(), and singlestep().

#define GCSpropagate 1

Definition at line 18 of file lgc.h.

Referenced by luaC_barrierf(), luaC_fullgc(), luaC_linkupval(), markroot(), and singlestep().

#define GCSsweep 3

Definition at line 20 of file lgc.h.

Referenced by luaC_fullgc(), and singlestep().

#define GCSsweepstring 2

Definition at line 19 of file lgc.h.

Referenced by atomic(), luaC_fullgc(), luaS_resize(), and singlestep().

#define gray2black | ( | x |  | ) | l_setbit((x)->gch.marked, BLACKBIT)

Definition at line 73 of file lgc.h.

Referenced by luaC_linkupval(), propagatemark(), and reallymarkobject().

#define isblack | ( | x |  | ) | testbit((x)->gch.marked, BLACKBIT)

Definition at line 66 of file lgc.h.

Referenced by luaC_barrierback(), luaC_barrierf(), and luaF_close().

#define isdead | ( | g,
|  | v |  | ) | ((v)->gch.marked & otherwhite(g) & WHITEBITS)

Definition at line 70 of file lgc.h.

Referenced by luaC_barrierback(), luaC_barrierf(), luaF_close(), luaF_findupval(), luaS_newlstr(), reallymarkobject(), and sweeplist().

#define isgray | ( | x |  | ) | (!isblack(x) && !iswhite(x))

Definition at line 67 of file lgc.h.

Referenced by luaC_linkupval(), propagatemark(), and remarkupvals().

#define iswhite | ( | x |  | ) | test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)

Definition at line 65 of file lgc.h.

Referenced by adjust_varargs(), atomic(), iscleared(), lua_pushcclosure(), luaC_barrierf(), luaC_separateudata(), luaE_newthread(), and reallymarkobject().

#define KEYWEAKBIT 3

Definition at line 58 of file lgc.h.

Referenced by cleartable(), and traversetable().

#define l_setbit | ( | x,
|  | b |  | ) | setbits(x, bitmask(b))

Definition at line 32 of file lgc.h.

#define luaC_barrier | ( | L,
|  | p,
|  | v |  | ) |

Value:

    { if (valiswhite(v) && isblack(obj2gco(p)))  \
            luaC_barrierf(L,obj2gco(p),gcvalue(v)); }

Definition at line 86 of file lgc.h.

Referenced by addk(), lua_replace(), lua_setupvalue(), luaC_linkupval(), and luaV_execute().

#define luaC_barriert | ( | L,
|  | t,
|  | v |  | ) |

Value:

    { if (valiswhite(v) && isblack(obj2gco(t)))  \
            luaC_barrierback(L,t); }

Definition at line 89 of file lgc.h.

Referenced by lua_rawset(), lua_rawseti(), luaV_execute(), luaV_settable(), and newkey().

#define luaC_checkGC | ( | L |  | ) |

Value:

    { \
      condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
      if (G(L)->totalbytes >= G(L)->GCthreshold) \
            luaC_step(L); }

Definition at line 80 of file lgc.h.

Referenced by adjust_varargs(), f_parser(), lua_concat(), lua_createtable(), lua_newthread(), lua_newuserdata(), lua_pushcclosure(), lua_pushfstring(), lua_pushlstring(), lua_pushvfstring(), lua_tolstring(), luaD_call(), and luaV_execute().

#define luaC_objbarrier | ( | L,
|  | p,
|  | o |  | ) |

Value:

    { if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
                    luaC_barrierf(L,obj2gco(p),obj2gco(o)); }

Definition at line 92 of file lgc.h.

Referenced by indexupvalue(), lua_setfenv(), lua_setmetatable(), pushclosure(), and registerlocalvar().

#define luaC_objbarriert | ( | L,
|  | t,
|  | o |  | ) | { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }

Definition at line 96 of file lgc.h.

Referenced by lua_setmetatable().

#define luaC_white | ( | g |  | ) | cast(lu_byte, (g)->currentwhite & WHITEBITS)

Definition at line 77 of file lgc.h.

Referenced by lua_newstate(), luaC_link(), luaF_findupval(), luaS_newudata(), and newlstr().

#define otherwhite | ( | g |  | ) | (g->currentwhite ^ WHITEBITS)

Definition at line 69 of file lgc.h.

Referenced by atomic(), and sweeplist().

#define reset2bits | ( | x,
|  | b1,
|  | b2 |  | ) | resetbits(x, (bit2mask(b1, b2)))

Definition at line 36 of file lgc.h.

#define resetbit | ( | x,
|  | b |  | ) | resetbits(x, bitmask(b))

Definition at line 33 of file lgc.h.

#define resetbits | ( | x,
|  | m |  | ) | ((x) &= cast(lu_byte, ~(m)))

Definition at line 27 of file lgc.h.

#define set2bits | ( | x,
|  | b1,
|  | b2 |  | ) | setbits(x, (bit2mask(b1, b2)))

Definition at line 35 of file lgc.h.

Referenced by lua_newstate().

#define setbits | ( | x,
|  | m |  | ) | ((x) |= (m))

Definition at line 28 of file lgc.h.

#define SFIXEDBIT 6

Definition at line 61 of file lgc.h.

Referenced by lua_newstate(), luaC_freeall(), and sweeplist().

#define test2bits | ( | x,
|  | b1,
|  | b2 |  | ) | testbits(x, (bit2mask(b1, b2)))

Definition at line 37 of file lgc.h.

#define testbit | ( | x,
|  | b |  | ) | testbits(x, bitmask(b))

Definition at line 34 of file lgc.h.

Referenced by cleartable(), and sweeplist().

#define testbits | ( | x,
|  | m |  | ) | ((x) & (m))

Definition at line 29 of file lgc.h.

#define valiswhite | ( | x |  | ) | (iscollectable(x) && iswhite(gcvalue(x)))

Definition at line 75 of file lgc.h.

#define VALUEWEAKBIT 4

Definition at line 59 of file lgc.h.

Referenced by cleartable(), and traversetable().

#define WHITE0BIT 0

Definition at line 54 of file lgc.h.

Referenced by lua_newstate().

#define WHITE1BIT 1

Definition at line 55 of file lgc.h.

#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)

Definition at line 62 of file lgc.h.

Referenced by luaC_freeall(), and sweeplist().

## Function Documentation

void luaC_barrierback | ( | lua_State * | L,
|  | Table * | t |
| ) |  |  |

Definition at line 675 of file lgc.c.

References black2gray, G, Table::gclist, GCSfinalize, GCSpause, global_State::gcstate, global_State::grayagain, isblack, isdead, lua_assert, and obj2gco.

void luaC_barrierf | ( | lua_State * | L,
|  | GCObject * | o,
|  | GCObject * | v |
| ) |  |  |

Definition at line 662 of file lgc.c.

References G, GCObject::gch, GCSfinalize, GCSpause, GCSpropagate, global_State::gcstate, isblack, isdead, iswhite, lua_assert, makewhite, reallymarkobject(), and ttype.

void luaC_callGCTM | ( | lua_State * | L | ) |

Definition at line 477 of file lgc.c.

References G, and GCTM().

Referenced by callallgcTM().

void luaC_freeall | ( | lua_State * | L | ) |

Definition at line 483 of file lgc.c.

References bitmask, global_State::currentwhite, G, stringtable::hash, global_State::rootgc, SFIXEDBIT, stringtable::size, global_State::strt, sweepwholelist, and WHITEBITS.

Referenced by close_state().

void luaC_fullgc | ( | lua_State * | L | ) |

Definition at line 636 of file lgc.c.

References G, GCSfinalize, GCSpause, GCSpropagate, GCSsweep, GCSsweepstring, global_State::gcstate, global_State::gray, global_State::grayagain, lua_assert, markroot(), global_State::rootgc, setthreshold, singlestep(), global_State::sweepgc, global_State::sweepstrgc, and global_State::weak.

Referenced by lua_gc().

void luaC_link | ( | lua_State * | L,
|  | GCObject * | o,
|  | lu_byte | tt |
| ) |  |  |

Definition at line 686 of file lgc.c.

References G, GCObject::gch, luaC_white, GCheader::marked, GCheader::next, global_State::rootgc, and GCheader::tt.

Referenced by luaE_newthread(), luaF_newCclosure(), luaF_newLclosure(), luaF_newproto(), luaF_newupval(), and luaH_new().

void luaC_linkupval | ( | lua_State * | L,
|  | UpVal * | uv |
| ) |  |  |

Definition at line 695 of file lgc.c.

References G, GCObject::gch, GCSfinalize, GCSpause, GCSpropagate, global_State::gcstate, gray2black, isgray, lua_assert, luaC_barrier, makewhite, GCheader::next, obj2gco, global_State::rootgc, and UpVal::v.

Referenced by luaF_close().

size_t luaC_separateudata | ( | lua_State * | L,
|  | int | all |
| ) |  |  |

Definition at line 128 of file lgc.c.

References fasttm, G, GCObject::gch, gco2u, isfinalized, iswhite, global_State::mainthread, markfinalized, GCheader::next, lua_State::next, sizeudata, TM_GC, and global_State::tmudata.

Referenced by atomic(), and lua_close().

void luaC_step | ( | lua_State * | L | ) |

Definition at line 610 of file lgc.c.

References global_State::estimate, G, global_State::gcdept, GCSpause, global_State::gcstate, global_State::gcstepmul, GCSTEPSIZE, global_State::GCthreshold, lua_assert, MAX_LUMEM, setthreshold, singlestep(), and global_State::totalbytes.

Referenced by lua_gc().