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commit 0df6635711230ab306710056f621b6da59fac5ea
parent ae800656c9f82b54f6fae1497022d3484ad0c920
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date:   Wed, 21 Aug 2013 17:09:26 -0300

"fixed" objects kept in a separated list (instead of being kept in
'allgc' list with a bit marking them)

Diffstat:
Mlgc.c | 13++++++++++++-
Mlgc.h | 6+++---
Mllex.c | 10++++++----
Mlstate.c | 7++++---
Mlstate.h | 6+++++-
Mlstring.h | 4+---
Mltm.c | 4++--
7 files changed, 33 insertions(+), 17 deletions(-)

diff --git a/lgc.c b/lgc.c @@ -1,5 +1,5 @@ /* -** $Id: lgc.c,v 2.148 2013/08/20 17:46:34 roberto Exp roberto $ +** $Id: lgc.c,v 2.149 2013/08/21 19:21:16 roberto Exp roberto $ ** Garbage Collector ** See Copyright Notice in lua.h */ @@ -189,6 +189,16 @@ void luaC_checkupvalcolor (global_State *g, UpVal *uv) { } +void luaC_fix (lua_State *L, GCObject *o) { + global_State *g = G(L); + lua_assert(g->allgc == o); + white2gray(o); + g->allgc = o->gch.next; /* remove object from 'allgc' list */ + o->gch.next = g->fixedgc; /* link it to 'fixedgc' list */ + g->fixedgc = o; +} + + /* ** create a new collectable object (with given type and size) and link ** it to '*list'. 'offset' tells how many bytes to allocate before the @@ -927,6 +937,7 @@ void luaC_freeallobjects (lua_State *L) { g->gckind = KGC_NORMAL; sweepwholelist(L, &g->finobj); /* finalizers can create objs. in 'finobj' */ sweepwholelist(L, &g->allgc); + sweepwholelist(L, &g->fixedgc); /* collect fixed objects */ lua_assert(g->strt.nuse == 0); } diff --git a/lgc.h b/lgc.h @@ -1,5 +1,5 @@ /* -** $Id: lgc.h,v 2.63 2013/08/20 17:46:34 roberto Exp roberto $ +** $Id: lgc.h,v 2.64 2013/08/21 19:21:16 roberto Exp roberto $ ** Garbage Collector ** See Copyright Notice in lua.h */ @@ -76,8 +76,7 @@ #define WHITE1BIT 1 /* object is white (type 1) */ #define BLACKBIT 2 /* object is black */ #define FINALIZEDBIT 3 /* object has been marked for finalization */ -#define FIXEDBIT 4 /* object is fixed (should not be collected) */ -#define LOCALBIT 5 /* object is not local */ +#define LOCALBIT 4 /* object is not local */ /* bit 7 is currently used by tests (luaL_checkmemory) */ #define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT) @@ -127,6 +126,7 @@ { if (nolocal(obj2gco(o)), isblack(obj2gco(p)) && iswhite(obj2gco(o))) \ luaC_barrierback_(L,p); } +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_forcestep (lua_State *L); diff --git a/llex.c b/llex.c @@ -1,5 +1,5 @@ /* -** $Id: llex.c,v 2.66 2013/05/14 15:59:04 roberto Exp roberto $ +** $Id: llex.c,v 2.67 2013/06/19 14:27:00 roberto Exp roberto $ ** Lexical Analyzer ** See Copyright Notice in lua.h */ @@ -15,6 +15,7 @@ #include "lctype.h" #include "ldo.h" +#include "lgc.h" #include "llex.h" #include "lobject.h" #include "lparser.h" @@ -64,9 +65,11 @@ static void save (LexState *ls, int c) { void luaX_init (lua_State *L) { int i; + TString *e = luaS_new(L, LUA_ENV); /* create env name */ + luaC_fix(L, obj2gco(e)); /* never collect this name */ for (i=0; i<NUM_RESERVED; i++) { TString *ts = luaS_new(L, luaX_tokens[i]); - luaS_fix(ts); /* reserved words are never collected */ + luaC_fix(L, obj2gco(ts)); /* reserved words are never collected */ ts->tsv.extra = cast_byte(i+1); /* reserved word */ } } @@ -163,8 +166,7 @@ void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source, ls->linenumber = 1; ls->lastline = 1; ls->source = source; - ls->envn = luaS_new(L, LUA_ENV); /* create env name */ - luaS_fix(ls->envn); /* never collect this name */ + ls->envn = luaS_new(L, LUA_ENV); /* get env name */ luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */ } diff --git a/lstate.c b/lstate.c @@ -1,5 +1,5 @@ /* -** $Id: lstate.c,v 2.102 2013/08/16 18:55:49 roberto Exp roberto $ +** $Id: lstate.c,v 2.103 2013/08/21 19:21:16 roberto Exp roberto $ ** Global State ** See Copyright Notice in lua.h */ @@ -188,7 +188,7 @@ static void f_luaopen (lua_State *L, void *ud) { luaX_init(L); /* pre-create memory-error message */ g->memerrmsg = luaS_newliteral(L, MEMERRMSG); - luaS_fix(g->memerrmsg); /* it should never be collected */ + luaC_fix(L, obj2gco(g->memerrmsg)); /* it should never be collected */ g->gcrunning = 1; /* allow gc */ } @@ -270,7 +270,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) { g = &l->g; L->next = NULL; L->tt = LUA_TTHREAD; - g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT); + g->currentwhite = bitmask(WHITE0BIT); L->marked = luaC_white(g) | bitmask(LOCALBIT); g->gckind = KGC_NORMAL; preinit_state(L, g); @@ -290,6 +290,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) { g->allgc = NULL; g->finobj = NULL; g->tobefnz = NULL; + g->fixedgc = NULL; g->sweepgc = g->sweepfin = NULL; g->gray = g->grayagain = NULL; g->weak = g->ephemeron = g->allweak = NULL; diff --git a/lstate.h b/lstate.h @@ -1,5 +1,5 @@ /* -** $Id: lstate.h,v 2.85 2013/08/20 17:46:34 roberto Exp roberto $ +** $Id: lstate.h,v 2.86 2013/08/21 19:21:16 roberto Exp roberto $ ** Global State ** See Copyright Notice in lua.h */ @@ -24,6 +24,9 @@ ** at the end of the 'allgc' list, after the 'l_registry' (which is ** the first object to be added to the list). ** +** List 'fixedgc' keep objects that are not to be collected (currently +** only small strings, such as reserved words). +** ** Open upvalues are not subject to independent garbage collection. They ** are collected together with their respective threads. (They are ** always gray, so they must be remarked in the atomic step. Usually @@ -132,6 +135,7 @@ typedef struct global_State { GCObject *ephemeron; /* list of ephemeron tables (weak keys) */ GCObject *allweak; /* list of all-weak tables */ GCObject *tobefnz; /* list of userdata to be GC */ + GCObject *fixedgc; /* list of objects not to be collected */ Mbuffer buff; /* temporary buffer for string concatenation */ int gcpause; /* size of pause between successive GCs */ int gcstepmul; /* GC `granularity' */ diff --git a/lstring.h b/lstring.h @@ -1,5 +1,5 @@ /* -** $Id: lstring.h,v 1.50 2013/08/16 18:55:49 roberto Exp roberto $ +** $Id: lstring.h,v 1.51 2013/08/21 19:21:16 roberto Exp roberto $ ** String table (keep all strings handled by Lua) ** See Copyright Notice in lua.h */ @@ -19,8 +19,6 @@ #define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \ (sizeof(s)/sizeof(char))-1)) -#define luaS_fix(s) setbits((s)->tsv.marked, bit2mask(FIXEDBIT, LOCALBIT)) - /* ** test whether a string is a reserved word diff --git a/ltm.c b/ltm.c @@ -1,5 +1,5 @@ /* -** $Id: ltm.c,v 2.19 2013/04/29 16:56:50 roberto Exp roberto $ +** $Id: ltm.c,v 2.20 2013/05/06 17:19:11 roberto Exp roberto $ ** Tag methods ** See Copyright Notice in lua.h */ @@ -43,7 +43,7 @@ void luaT_init (lua_State *L) { int i; for (i=0; i<TM_N; i++) { G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]); - luaS_fix(G(L)->tmname[i]); /* never collect these names */ + luaC_fix(L, obj2gco(G(L)->tmname[i])); /* never collect these names */ } }