blob: 5e474114dce6fb9b12421d873fbb7076de9e21fa [file] [log] [blame]
** $Id: lgc.h $
** Garbage Collector
** See Copyright Notice in lua.h
#ifndef lgc_h
#define lgc_h
#include <stddef.h>
#include "lobject.h"
#include "lstate.h"
** Collectable objects may have one of three colors: white, which means
** the object is not marked; gray, which means the object is marked, but
** its references may be not marked; and black, which means that the
** object and all its references are marked. The main invariant of the
** garbage collector, while marking objects, is that a black object can
** never point to a white one. Moreover, any gray object must be in a
** "gray list" (gray, grayagain, weak, allweak, ephemeron) so that it
** can be visited again before finishing the collection cycle. (Open
** upvalues are an exception to this rule.) These lists have no meaning
** when the invariant is not being enforced (e.g., sweep phase).
** Possible states of the Garbage Collector
#define GCSpropagate 0
#define GCSenteratomic 1
#define GCSatomic 2
#define GCSswpallgc 3
#define GCSswpfinobj 4
#define GCSswptobefnz 5
#define GCSswpend 6
#define GCScallfin 7
#define GCSpause 8
#define issweepphase(g) \
(GCSswpallgc <= (g)->gcstate && (g)->gcstate <= GCSswpend)
** macro to tell when main invariant (white objects cannot point to black
** ones) must be kept. During a collection, the sweep
** phase may break the invariant, as objects turned white may point to
** still-black objects. The invariant is restored when sweep ends and
** all objects are white again.
#define keepinvariant(g) ((g)->gcstate <= GCSatomic)
** some useful bit tricks
#define resetbits(x,m) ((x) &= cast_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))
** Layout for bit use in 'marked' field. First three bits are
** used for object "age" in generational mode. Last bit is used
** by tests.
#define WHITE0BIT 3 /* object is white (type 0) */
#define WHITE1BIT 4 /* object is white (type 1) */
#define BLACKBIT 5 /* object is black */
#define FINALIZEDBIT 6 /* object has been marked for finalization */
#define TESTBIT 7
#define iswhite(x) testbits((x)->marked, WHITEBITS)
#define isblack(x) testbit((x)->marked, BLACKBIT)
#define isgray(x) /* neither white nor black */ \
(!testbits((x)->marked, WHITEBITS | bitmask(BLACKBIT)))
#define tofinalize(x) testbit((x)->marked, FINALIZEDBIT)
#define otherwhite(g) ((g)->currentwhite ^ WHITEBITS)
#define isdeadm(ow,m) ((m) & (ow))
#define isdead(g,v) isdeadm(otherwhite(g), (v)->marked)
#define changewhite(x) ((x)->marked ^= WHITEBITS)
#define nw2black(x) \
check_exp(!iswhite(x), l_setbit((x)->marked, BLACKBIT))
#define luaC_white(g) cast_byte((g)->currentwhite & WHITEBITS)
/* object age in generational mode */
#define G_NEW 0 /* created in current cycle */
#define G_SURVIVAL 1 /* created in previous cycle */
#define G_OLD0 2 /* marked old by frw. barrier in this cycle */
#define G_OLD1 3 /* first full cycle as old */
#define G_OLD 4 /* really old object (not to be visited) */
#define G_TOUCHED1 5 /* old object touched this cycle */
#define G_TOUCHED2 6 /* old object touched in previous cycle */
#define AGEBITS 7 /* all age bits (111) */
#define getage(o) ((o)->marked & AGEBITS)
#define setage(o,a) ((o)->marked = cast_byte(((o)->marked & (~AGEBITS)) | a))
#define isold(o) (getage(o) > G_SURVIVAL)
** In generational mode, objects are created 'new'. After surviving one
** cycle, they become 'survival'. Both 'new' and 'survival' can point
** to any other object, as they are traversed at the end of the cycle.
** We call them both 'young' objects.
** If a survival object survives another cycle, it becomes 'old1'.
** 'old1' objects can still point to survival objects (but not to
** new objects), so they still must be traversed. After another cycle
** (that, being old, 'old1' objects will "survive" no matter what)
** finally the 'old1' object becomes really 'old', and then they
** are no more traversed.
** To keep its invariants, the generational mode uses the same barriers
** also used by the incremental mode. If a young object is caught in a
** foward barrier, it cannot become old immediately, because it can
** still point to other young objects. Instead, it becomes 'old0',
** which in the next cycle becomes 'old1'. So, 'old0' objects is
** old but can point to new and survival objects; 'old1' is old
** but cannot point to new objects; and 'old' cannot point to any
** young object.
** If any old object ('old0', 'old1', 'old') is caught in a back
** barrier, it becomes 'touched1' and goes into a gray list, to be
** visited at the end of the cycle. There it evolves to 'touched2',
** which can point to survivals but not to new objects. In yet another
** cycle then it becomes 'old' again.
** The generational mode must also control the colors of objects,
** because of the barriers. While the mutator is running, young objects
** are kept white. 'old', 'old1', and 'touched2' objects are kept black,
** as they cannot point to new objects; exceptions are threads and open
** upvalues, which age to 'old1' and 'old' but are kept gray. 'old0'
** objects may be gray or black, as in the incremental mode. 'touched1'
** objects are kept gray, as they must be visited again at the end of
** the cycle.
/* Default Values for GC parameters */
** Minor collections will shift to major ones after LUAI_MINORMAJOR%
** objects become old.
** Major collections will shift to minor ones after a collection
** collects at least LUAI_MAJORMINOR% of the new objects.
** A young (minor) collection will run after creating LUAI_GENMINORMUL%
** new objects.
/* incremental */
/* Number of objects must be LUAI_GCPAUSE% before starting new cycle */
#define LUAI_GCPAUSE 200
/* Step multiplier. (Roughly, the collector handles LUAI_GCMUL% objects
for each new allocated object.) */
#define LUAI_GCMUL 200
/* How many objects to allocate before next GC step */
#define setgcparam(g,p,v) (g->gcparams[LUA_GCP##p] = luaO_codeparam(v))
#define applygcparam(g,p,x) luaO_applyparam(g->gcparams[LUA_GCP##p], x)
** Control when GC is running:
#define GCSTPUSR 1 /* bit true when GC stopped by user */
#define GCSTPGC 2 /* bit true when GC stopped by itself */
#define GCSTPCLS 4 /* bit true when closing Lua state */
#define gcrunning(g) ((g)->gcstp == 0)
** Does one step of collection when debt becomes zero. 'pre'/'pos'
** allows some adjustments to be done only when needed. macro
** 'condchangemem' is used only for heavy tests (forcing a full
** GC cycle on every opportunity)
#define luaC_condGC(L,pre,pos) \
{ if (G(L)->GCdebt <= 0) { pre; luaC_step(L); pos;}; \
condchangemem(L,pre,pos); }
/* more often than not, 'pre'/'pos' are empty */
#define luaC_checkGC(L) luaC_condGC(L,(void)0,(void)0)
#define luaC_objbarrier(L,p,o) ( \
(isblack(p) && iswhite(o)) ? \
luaC_barrier_(L,obj2gco(p),obj2gco(o)) : cast_void(0))
#define luaC_barrier(L,p,v) ( \
iscollectable(v) ? luaC_objbarrier(L,p,gcvalue(v)) : cast_void(0))
#define luaC_objbarrierback(L,p,o) ( \
(isblack(p) && iswhite(o)) ? luaC_barrierback_(L,p) : cast_void(0))
#define luaC_barrierback(L,p,v) ( \
iscollectable(v) ? luaC_objbarrierback(L, p, gcvalue(v)) : cast_void(0))
LUAI_FUNC void luaC_fix (lua_State *L, GCObject *o);
LUAI_FUNC void luaC_freeallobjects (lua_State *L);
LUAI_FUNC void luaC_step (lua_State *L);
LUAI_FUNC void luaC_runtilstate (lua_State *L, int state, int fast);
LUAI_FUNC void luaC_fullgc (lua_State *L, int isemergency);
LUAI_FUNC GCObject *luaC_newobj (lua_State *L, int tt, size_t sz);
LUAI_FUNC GCObject *luaC_newobjdt (lua_State *L, int tt, size_t sz,
size_t offset);
LUAI_FUNC void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v);
LUAI_FUNC void luaC_barrierback_ (lua_State *L, GCObject *o);
LUAI_FUNC void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt);
LUAI_FUNC void luaC_changemode (lua_State *L, int newmode);