1079391767
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@967 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
420 lines
8.5 KiB
C
420 lines
8.5 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: agc.c *
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* Last rev: *
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* mods: *
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* comments: reclaim unused atoms and functors *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "@(#)agc.c 1.3 3/15/90";
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#endif
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#include "absmi.h"
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#include "alloc.h"
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#include "yapio.h"
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#ifdef DEBUG
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/* #define DEBUG_RESTORE2 1 */
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#define errout Yap_stderr
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#endif
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STATIC_PROTO(void RestoreEntries, (PropEntry *));
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STATIC_PROTO(void CleanCode, (PredEntry *));
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static int agc_calls;
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static unsigned long int agc_collected;
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static Int tot_agc_time = 0; /* total time spent in GC */
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static Int tot_agc_recovered = 0; /* number of heap objects in all garbage collections */
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#define AtomMarkedBit 1
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static inline void
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MarkAtomEntry(AtomEntry *ae)
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{
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CELL c = (CELL)(ae->NextOfAE);
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c |= AtomMarkedBit;
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ae->NextOfAE = (Atom)c;
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}
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static inline int
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AtomResetMark(AtomEntry *ae)
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{
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CELL c = (CELL)(ae->NextOfAE);
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if (c & AtomMarkedBit) {
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c &= ~AtomMarkedBit;
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ae->NextOfAE = (Atom)c;
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return (TRUE);
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}
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return (FALSE);
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}
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static inline Atom
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CleanAtomMarkedBit(Atom a)
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{
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CELL c = (CELL)a;
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c &= ~AtomMarkedBit;
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return((Atom)c);
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}
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static inline Functor
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FuncAdjust(Functor f)
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{
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AtomEntry *ae = RepAtom(NameOfFunctor(f));
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MarkAtomEntry(ae);
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return(f);
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}
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static inline Term
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AtomTermAdjust(Term t)
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{
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AtomEntry *ae = RepAtom(AtomOfTerm(t));
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MarkAtomEntry(ae);
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return(t);
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}
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static inline Atom
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AtomAdjust(Atom a)
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{
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AtomEntry *ae;
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if (a == NIL) return(a);
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ae = RepAtom(a);
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MarkAtomEntry(ae);
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return(a);
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}
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#define HDiff TRUE
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#define OldHeapTop HeapTop
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#define IsOldCode(P) FALSE
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#define IsOldCodeCellPtr(P) FALSE
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#define IsOldDelay(P) FALSE
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#define IsOldDelayPtr(P) FALSE
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#define IsOldLocalInTR(P) FALSE
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#define IsOldLocalInTRPtr(P) FALSE
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#define IsOldGlobal(P) FALSE
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#define IsOldGlobalPtr(P) FALSE
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#define IsOldTrail(P) FALSE
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#define IsOldTrailPtr(P) FALSE
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#define CharP(X) ((char *)(X))
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#define AddrAdjust(P) (P)
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#define AtomEntryAdjust(P) (P)
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#define BlobTermAdjust(P) (P)
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#define CellPtoHeapAdjust(P) (P)
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#define CellPtoHeapCellAdjust(P) (P)
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#define CellPtoTRAdjust(P) (P)
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#define CodeAddrAdjust(P) (P)
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#define ConsultObjAdjust(P) (P)
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#define DelayAddrAdjust(P) (P)
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#define DBRefAdjust(P) (P)
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#define DBRefPAdjust(P) (P)
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#define DBTermAdjust(P) (P)
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#define LUIndexAdjust(P) (P)
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#define SIndexAdjust(P) (P)
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#define LocalAddrAdjust(P) (P)
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#define GlobalAddrAdjust(P) (P)
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#define PtoLUCAdjust(P) (P)
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#define PtoStCAdjust(P) (P)
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#define PtoArrayEAdjust(P) (P)
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#define PtoDelayAdjust(P) (P)
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#define PtoGloAdjust(P) (P)
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#define PtoLocAdjust(P) (P)
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#define PtoHeapCellAdjust(P) (P)
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#define PtoOpAdjust(P) (P)
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#define PtoPredAdjust(P) (P)
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#define PropAdjust(P) (P)
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#define TrailAddrAdjust(P) (P)
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#define XAdjust(P) (P)
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#define YAdjust(P) (P)
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static void
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recompute_mask(DBRef dbr)
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{
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return;
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}
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static void
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rehash(CELL *oldcode, int NOfE, int KindOfEntries)
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{
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}
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#include "rheap.h"
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/*
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* This is the really tough part, to restore the whole of the heap
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*/
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static void
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mark_atoms(void)
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{
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AtomHashEntry *HashPtr = HashChain;
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register int i;
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Atom atm;
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AtomEntry *at;
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restore_codes();
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for (i = 0; i < AtomHashTableSize; ++i) {
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atm = HashPtr->Entry;
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if (atm) {
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at = RepAtom(atm);
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do {
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#ifdef DEBUG_RESTORE2 /* useful during debug */
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fprintf(errout, "Restoring %s\n", at->StrOfAE);
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#endif
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RestoreEntries(RepProp(at->PropsOfAE));
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atm = at->NextOfAE;
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at = RepAtom(CleanAtomMarkedBit(atm));
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} while (!EndOfPAEntr(at));
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}
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HashPtr++;
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}
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atm = INVISIBLECHAIN.Entry;
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at = RepAtom(atm);
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if (EndOfPAEntr(at)) {
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return;
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}
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do {
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#ifdef DEBUG_RESTORE2 /* useful during debug */
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fprintf(errout, "Restoring %s\n", at->StrOfAE);
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if (strcmp(at->StrOfAE,"$module_expansion") == 0) {
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printf("oops\n");
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}
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#endif
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RestoreEntries(RepProp(at->PropsOfAE));
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atm = at->NextOfAE;
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at = RepAtom(CleanAtomMarkedBit(atm));
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} while (!EndOfPAEntr(at));
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}
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static void
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mark_trail(void)
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{
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register CELL *pt;
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pt = (CELL *)TR;
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/* moving the trail is simple */
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while (pt != (CELL *)Yap_TrailBase) {
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register CELL reg = pt[-1];
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pt--;
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if (!IsVarTerm(reg)) {
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if (IsAtomTerm(reg)) {
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MarkAtomEntry(RepAtom(AtomOfTerm(reg)));
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}
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}
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}
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}
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static void
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mark_local(void)
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{
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register CELL *pt;
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/* Adjusting the local */
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pt = LCL0;
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/* moving the trail is simple */
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while (pt > ASP) {
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CELL reg = *--pt;
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if (!IsVarTerm(reg)) {
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if (IsAtomTerm(reg)) {
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MarkAtomEntry(RepAtom(AtomOfTerm(reg)));
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}
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}
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}
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}
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static void
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mark_global(void)
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{
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register CELL *pt;
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/*
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* to clean the global now that functors are just variables pointing to
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* the code
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*/
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pt = CellPtr(Yap_GlobalBase);
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while (pt < H) {
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register CELL reg;
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reg = *pt;
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if (IsVarTerm(reg)) {
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pt++;
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continue;
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} else if (IsAtomTerm(reg)) {
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MarkAtomEntry(RepAtom(AtomOfTerm(reg)));
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} else if (IsApplTerm(reg)) {
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Functor f = FunctorOfTerm(reg);
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if (f <= FunctorDouble && f >= FunctorLongInt) {
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/* skip bitmaps */
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switch((CELL)f) {
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case (CELL)FunctorDouble:
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#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
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pt += 3;
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#else
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pt += 2;
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#endif
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break;
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#if USE_GMP
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case (CELL)FunctorBigInt:
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{
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Int sz = 1+
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sizeof(MP_INT)+
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(((MP_INT *)(pt+1))->_mp_alloc*sizeof(mp_limb_t));
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pt += sz;
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}
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break;
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#endif
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case (CELL)FunctorLongInt:
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default:
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pt += 2;
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break;
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}
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}
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}
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pt++;
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}
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}
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static void
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mark_stacks(void)
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{
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mark_trail();
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mark_local();
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mark_global();
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}
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/*
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* This is the really tough part, to restore the whole of the heap
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*/
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static void
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clean_atoms(void)
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{
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AtomHashEntry *HashPtr = HashChain;
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register int i;
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Atom atm;
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Atom *patm;
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AtomEntry *at;
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for (i = 0; i < AtomHashTableSize; ++i) {
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atm = HashPtr->Entry;
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patm = &(HashPtr->Entry);
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while (atm != NIL) {
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at = RepAtom(CleanAtomMarkedBit(atm));
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if (AtomResetMark(at) || (AGCHook != NULL && !AGCHook(atm))) {
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patm = &(at->NextOfAE);
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atm = at->NextOfAE;
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NOfAtoms--;
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} else {
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#ifdef DEBUG_RESTORE2
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fprintf(stderr, "Purged %s\n", at->StrOfAE);
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#endif
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*patm = at->NextOfAE;
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atm = at->NextOfAE;
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agc_collected += Yap_SizeOfBlock((CODEADDR)at);
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Yap_FreeCodeSpace((char *)at);
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}
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}
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HashPtr++;
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}
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patm = &(INVISIBLECHAIN.Entry);
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atm = INVISIBLECHAIN.Entry;
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while (atm != NIL) {
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at = RepAtom(CleanAtomMarkedBit(atm));
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if (AtomResetMark(at) || (AGCHook != NULL && !AGCHook(atm))) {
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patm = &(atm->NextOfAE);
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NOfAtoms--;
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atm = at->NextOfAE;
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} else {
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#ifdef DEBUG_RESTORE2
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fprintf(stderr, "Purged %s\n", at->StrOfAE);
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#endif
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*patm = at->NextOfAE;
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atm = at->NextOfAE;
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agc_collected += Yap_SizeOfBlock((CODEADDR)at);
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Yap_FreeCodeSpace((char *)at);
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}
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}
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}
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static void
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atom_gc(void)
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{
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int gc_verbose = Yap_is_gc_verbose();
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int gc_trace = 0;
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Int time_start, agc_time;
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if (Yap_GetValue(AtomGcTrace) != TermNil)
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gc_trace = 1;
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agc_calls++;
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agc_collected = 0;
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if (gc_trace) {
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fprintf(Yap_stderr, "[agc]\n");
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} else if (gc_verbose) {
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fprintf(Yap_stderr, "[AGC] Start of atom garbage collection %d:\n", agc_calls);
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}
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time_start = Yap_cputime();
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/* get the number of active registers */
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YAPEnterCriticalSection();
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mark_stacks();
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mark_atoms();
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clean_atoms();
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YAPLeaveCriticalSection();
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agc_time = Yap_cputime()-time_start;
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tot_agc_time += agc_time;
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tot_agc_recovered += agc_collected;
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if (gc_verbose) {
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fprintf(Yap_stderr, "[AGC] collected %ld bytes.\n", agc_collected);
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fprintf(Yap_stderr, "[AGC] GC %d took %g sec, total of %g sec doing GC so far.\n", agc_calls, (double)agc_time/1000, (double)tot_agc_time/1000);
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}
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}
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void
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Yap_atom_gc(void)
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{
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atom_gc();
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}
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static Int
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p_atom_gc(void)
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{
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#ifndef FIXED_STACKS
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atom_gc();
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#endif /* FIXED_STACKS */
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return(TRUE);
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}
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static Int
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p_inform_agc(void)
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{
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Term tn = MkIntegerTerm(tot_agc_time);
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Term tt = MkIntegerTerm(agc_calls);
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Term ts = MkIntegerTerm(tot_agc_recovered);
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return(Yap_unify(tn, ARG2) && Yap_unify(tt, ARG1) && Yap_unify(ts, ARG3));
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}
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void
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Yap_init_agc(void)
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{
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Yap_InitCPred("$atom_gc", 0, p_atom_gc, 0);
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Yap_InitCPred("$inform_agc", 3, p_inform_agc, 0);
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}
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