(FILECREATED "20-Feb-84 17:07:11" {PHYLUM}<LISPCORE>SOURCES>LLGC.;26
 71540Q 

      changes to:  (FNS \HTFIND \GC.ENTER.BIGREFCNT \GC.MODIFY.BIGREFCNT \GC.LOOKUP.BIGREFCNT)
		   (MACROS .MODENTRY.)
		   (VARS LLGCCOMS)

      previous date: "18-Feb-84 12:28:43" {PHYLUM}<LISPCORE>SOURCES>LLGC.;24)


(* Copyright (c) 1981, 1982, 1983, 1984 by Xerox Corporation)

(PRETTYCOMPRINT LLGCCOMS)

(RPAQQ LLGCCOMS
 ((E (RESETSAVE (RADIX 8)))
		 [COMS (* for MAKEINIT)
		       (FNS INITGC)
		       (DECLARE: DONTCOPY (ADDVARS (MKI.SUBFNS (ADDREF . PROGN)
							       (\ADDREF . PROGN)
							       (\DELREF . PROGN)
							       (CREATEREF . PROGN)
							       (\CREATEREF . PROGN)
							       (DELETEREF . PROGN)
							       (.INCREMENT.ALLOCATION.COUNT. . PROGN))
						   )
				 (ADDVARS (INEWCOMS (FNS INITGC)))
				 EVAL@COMPILE
				 (ADDVARS (DONTCOMPILEFNS INITGC]
		 (FNS \HTFIND)
		 (COMS (FNS \GC.ENTER.BIGREFCNT \GC.MODIFY.BIGREFCNT \GC.LOOKUP.BIGREFCNT 
			    \GC.BIGREFCNT.MISSING)
		       (GLOBALVARS \HTBIGCOUNT))
		 (FNS \GCMAPTABLE \GC.HANDLEOVERFLOW \GCMAPSCAN \GCMAPUNSCAN \GCRECLAIMCELL 
		      \FREELISTCELL DISABLEGC \GCSCAN1 \GCSCAN2 \REFCNT)
		 (FNS RECLAIM \DORECLAIM RECLAIMMIN GCMESS GCGAG GCTRP)
		 (DECLARE: EVAL@COMPILE DONTCOPY (COMS * GCCOMPILERDEFS))
		 [DECLARE: DONTEVAL@LOAD DOCOPY (VARS (\RECLAIMMIN 3000)
						      (\RECLAIM.COUNTDOWN 3000)
						      (GCMESS)
						      (\GCTIME1 (CREATECELL \FIXP))
						      (\GCTIME2 (CREATECELL \FIXP]
		 (FNS \GCERROR)
		 (LOCALVARS . T)))



(* for MAKEINIT)


(DEFINEQ

(INITGC

  [LAMBDA NIL                                                (* bvm: "13-Feb-84 18:14")

    (CREATEPAGES \HTMAIN (FOLDHI \HTMAINSIZE WORDSPERPAGE)
		 T T)
    (CREATEPAGES \HTOVERFLOW 1 T T)
    (CREATEPAGES \HTBIGCOUNT 1 T)
    (CREATEPAGES \HTCOLL 1 NIL T)
    (CREATEPAGES (\ADDBASE \HTCOLL WORDSPERPAGE)
		 (SUB1 (FOLDHI \HTCOLLSIZE WORDSPERPAGE))
		 T)
    (replace
 (HTCOLL FREEPTR) of
 \HTCOLL with
 0)
    (replace
 (HTCOLL NEXTFREE) of
 \HTCOLL with
 2])
)
(DECLARE: DONTCOPY 

(ADDTOVAR MKI.SUBFNS
 (ADDREF . PROGN)
		     (\ADDREF . PROGN)
		     (\DELREF . PROGN)
		     (CREATEREF . PROGN)
		     (\CREATEREF . PROGN)
		     (DELETEREF . PROGN)
		     (.INCREMENT.ALLOCATION.COUNT. . PROGN))


(ADDTOVAR INEWCOMS
 (FNS INITGC))
EVAL@COMPILE 

(ADDTOVAR DONTCOMPILEFNS
 INITGC)
)
(DEFINEQ

(\HTFIND

  [LAMBDA (PTR CASE)                                         (* bvm: "20-Feb-84 17:07")


          (* Modify reference count of the constants ptr according to case -

	  Returns PTR if result is 0 ref cnt, NIL otherwise -

	  CASE is one of (\ADDREFCASE \DELREFCASE \SCANREFCASE \UNSCANREFCASE))



    (PROG ((PROBE PTR)
	   ENTRY LINK PREV)
          (CHECK (NOT \INTERRUPTABLE))
          [COND
	    ((NOT (ZEROP (LOGAND (\GETBASE \MDSTypeTable (LRSH (fetch
 (POINTER PAGE#) of
 PTR)
							       1))
				 \TT.NOREF)))
	      (RETURN))
	    ((EQ (NTYPX PTR)
		 \VMEMPAGEP)
	      (SETQ PROBE (fetch
 (POINTER PAGEBASE) of
 PTR]
          (CHECK (EVENP (\LOLOC PTR)))
          (AND (\GCDISABLED)
	       (RETURN))
          (SETQ ENTRY (\ADDBASE \HTMAIN (LRSH (\LOLOC PROBE)
					      1)))
          [COND
	    ((fetch
 (GC EMPTY) of
 ENTRY)                     (* create new entry)

	      (RETURN (.NEWENTRY. ENTRY PTR CASE]
          (COND
	    ((fetch
 (GC LINKP) of
 ENTRY)                     (* chase down the link)

	      (GO FINDLINK)))
          [COND
	    ((EQ (\HILOC PTR)
		 (fetch
 (GC HIBITS) of
 ENTRY))               (* matches pointer in main table)

	      (RETURN (COND
			((.MODENTRY. ENTRY CASE PTR)
			  (replace
 (GC EMPTY) of
 ENTRY with
 T)
			  NIL)
			((EQ (fetch
 (GC STKCNT) of
 ENTRY)
			     0)
			  PTR)
			(T NIL]

          (* * new collision)



      NEWCOLLISION
          (.GETLINK. LINK)
          (.GETLINK. PREV)
          (replace
 (GC NXTPTR) of
 PREV with
 (\LOLOC LINK))
          (replace
 (GC CONTENTS) of
 PREV with
 (fetch
 (GC CONTENTS) of
 ENTRY))
          (CHECK (EVENP (\LOLOC PREV)))
          (replace
 (GC LINKPTR) of
 ENTRY with
 (\LOLOC PREV))
          (replace
 (GC NXTPTR) of
 LINK with
 0)
          (replace
 (GC EMPTY) of
 LINK with
 T)
          (RETURN (.NEWENTRY. LINK PTR CASE))
      FINDLINK
          (SETQ LINK (\ADDBASE \HTCOLL (fetch
 (GC LINKPTR) of
 ENTRY)))
      LINKLOOP
          (CHECK (SELECTC (fetch
 (GC HIBITS) of
 LINK)
			  ((LIST \SmallPosHi \SmallNegHi \AtomHI)
			    NIL)
			  T))
          [COND
	    ((EQ (fetch
 (GC HIBITS) of
 LINK)
		 (\HILOC PTR))                               (* found the link entry)

	      (RETURN (COND
			((.MODENTRY. LINK CASE PTR)          (* reference count went to 1, delete list entry)

			  (.DELLINK. LINK PREV ENTRY)
			  NIL)
			((ZEROP (fetch
 (GC STKCNT) of
 LINK))
			  PTR)
			(T NIL]
          (SETQ PREV LINK)
          (COND
	    ((NEQ (SETQ LINK (fetch
 (GC NXTPTR) of
 LINK))
		  0)
	      (SETQ LINK (\ADDBASE \HTCOLL LINK))
	      (GO LINKLOOP)))

          (* * Didn't find an entry on this chain)



          (.GETLINK. LINK)
          (replace
 (GC NXTPTR) of
 LINK with
 0)
          (CHECK PREV)
          (replace
 (GC NXTPTR) of
 PREV with
 (\LOLOC LINK))
          (RETURN (.NEWENTRY. LINK PTR CASE])
)
(DEFINEQ

(\GC.ENTER.BIGREFCNT

  [LAMBDA (PTR ENTRY)                                        (* bvm: "20-Feb-84 16:46")


          (* Called when the ref cnt of PTR is incremented to \MAXHTCNT. PTR is inserted in a simple table pointed to by 

	  \HTBIGCOUNT until its ref cnt comes back down)



    (PROG ((OVENTRY \HTBIGCOUNT)
	   TMP)
          [COND
	    ((ODDP (\LOLOC PTR))                             (* This should be an error, but accomodate it for now)

	      (SETQ PTR (\ADDBASE PTR -1]
      LP  [SELECTQ (SETQ TMP (fetch
 OVFLPTR of
 OVENTRY))
		   (T                                        (* Deleted entry; reuse it)
)
		   [NIL                                      (* End of table; add new entry at end)

			(COND
			  ((EVENP (\LOLOC (\ADDBASE OVENTRY \HTBIGENTRYSIZE))
				  WORDSPERPAGE)              (* Need to allocate another page)

			    (\NEWPAGE (\ADDBASE OVENTRY \HTBIGENTRYSIZE]
		   (COND
		     ((EQ TMP PTR)
		       (RAID "PTR already in overflow table" PTR)
		       (add
 (fetch
 OVFLCNTHI of
 OVENTRY)
			    1)                               (* Assure it lives forever)

		       (RETURN))
		     (T (SETQ OVENTRY (\ADDBASE OVENTRY \HTBIGENTRYSIZE))
			(GO LP]
          (replace
 OVFLCNTLO of
 OVENTRY with
 \MAXHTCNT)
          (replace
 OVFLCNTHI of
 OVENTRY with
 0)
          (replace
 OVFLPTR of
 OVENTRY with
 PTR)
          (replace
 (GC CNT) of
 ENTRY with
 \MAXHTCNT])

(\GC.MODIFY.BIGREFCNT

  [LAMBDA (ENTRY CASE PTR)                                   (* bvm: "20-Feb-84 16:48")


          (* Called from .MODENTRY. to do one of the 4 reference counting cases on PTR. ENTRY is the gc table entry whose 

	  CNT field is \MAXHTCNT)



    (PROG ((OVENTRY \HTBIGCOUNT)
	   TMP CNT)
          [COND
	    ((ODDP (\LOLOC PTR))                             (* This should be an error, but accomodate it for now)

	      (SETQ PTR (\ADDBASE PTR -1]
      LP  (COND
	    ((NEQ (SETQ TMP (fetch
 OVFLPTR of
 OVENTRY))
		  PTR)
	      (COND
		((NULL TMP)
		  (\GC.BIGREFCNT.MISSING
 PTR)
		  (RETURN)))
	      (SETQ OVENTRY (\ADDBASE OVENTRY \HTBIGENTRYSIZE))
	      (GO LP)))
          (SELECTC CASE
		   [\ADDREFCASE (replace
 OVFLCNTLO of
 OVENTRY
				   with
 (COND
					  ((ILESSP (SETQ TMP (fetch
 OVFLCNTLO of
 OVENTRY))
						   MAX.SMALLP)
					    (ADD1 TMP))
					  (T (add
 (fetch
 OVFLCNTHI of
 OVENTRY)
						  1)
					     0]
		   [\DELREFCASE (replace
 OVFLCNTLO of
 OVENTRY
				   with
 (COND
					  ((IGEQ (SETQ TMP (SUB1 (fetch
 OVFLCNTLO of
 OVENTRY)))
						 \MAXHTCNT)
					    TMP)
					  ((ZEROP (fetch
 OVFLCNTHI of
 OVENTRY))
                                                             (* Ref cnt has fallen below max, bring it out)

					    (replace
 (GC CNT) of
 ENTRY with
 TMP)
					    (replace
 OVFLPTR of
 OVENTRY with
 T)
                                                             (* mark deleted)

					    TMP)
					  ((ILESSP TMP 0)
					    (add
 (fetch
 OVFLCNTHI of
 OVENTRY)
						 -1)
					    MAX.SMALLP)
					  (T TMP]
		   NIL)                                      (* Don't worry about SCANREF cases)

                                                             (* Value is NIL to tell .MODENTRY.

							     that cnt ~= 1)

          (RETURN NIL])

(\GC.LOOKUP.BIGREFCNT

  [LAMBDA (PTR)                                              (* bvm: "20-Feb-84 16:48")

                                                             (* Returns ref cnt of PTR from the big table)

    (PROG ((OVENTRY \HTBIGCOUNT)
	   TMP)
          [COND
	    ((ODDP (\LOLOC PTR))                             (* This should be an error, but accomodate it for now)

	      (SETQ PTR (\ADDBASE PTR -1]
      LP  (COND
	    ((NEQ (SETQ TMP (fetch
 OVFLPTR of
 OVENTRY))
		  PTR)
	      (COND
		((NULL TMP)
		  (\GC.BIGREFCNT.MISSING
 PTR)
		  (RETURN \MAXHTCNT)))
	      (SETQ OVENTRY (\ADDBASE OVENTRY \HTBIGENTRYSIZE))
	      (GO LP)))
          (RETURN (\MAKENUMBER (fetch
 OVFLCNTHI of
 OVENTRY)
			       (fetch
 OVFLCNTLO of
 OVENTRY])

(\GC.BIGREFCNT.MISSING

  [LAMBDA (PTR)                                              (* bvm: "14-Feb-84 12:46")

    (RAID "Big refcnt ptr not in table" PTR])
)
(DECLARE: DOEVAL@COMPILE DONTCOPY

(ADDTOVAR GLOBALVARS \HTBIGCOUNT)
)
(DEFINEQ

(\GCMAPTABLE

  [LAMBDA (ARG)                    (* lmm "13-FEB-83 13:40")

    (DECLARE
 (GLOBALVARS \MaxTypeNumber))
                                   (* called as PUNT after microcode has put some things in the overflow table)

    (UNINTERRUPTABLY
        [PROG ((CELL \HTOVERFLOW)
	       PTR)
	  LP  (COND
		((SETQ PTR (fetch
 (HTOVERFLOW PTR) of
 CELL))
		  (\HTFIND
 PTR (fetch
 (HTOVERFLOW CASE) of
 CELL))
		  (replace
 (HTOVERFLOW CLEAR) of
 CELL with
 T)
		  (SETQ CELL (\ADDBASE CELL WORDSPERCELL))
		  (GO LP]
	[bind
 DTD N for
 I from
 1 to
 \MaxTypeNumber when
 (NEQ (fetch
 DTDSIZE of
 (SETQ DTD
										 (\GETDTD I)))
							     0)
	   do
 [COND
		((AND (NULL (fetch
 DTDFREE of
 DTD))
		      (OR (EQ CDRCODING 0)
			  (NEQ I \LISTP)))
		  (SELECTQ (\INDEXATOMPNAME (fetch
 DTDNAME of
 DTD))
			   ((NIL **DEALLOC**))
			   (\GCTYPE I DTD]
	      (COND
		((NEQ 0 (SETQ N (fetch
 DTDCNT0 of
 DTD)))
		  (.INCREMENT.ALLOCATION.COUNT. N)
		  (.BOXIPLUS. (fetch
 DTDCNTLOC of
 DTD)
			      (fetch
 DTDCNT0 of
 DTD))
		  (replace
 DTDCNT0 of
 DTD with
 0]
	ARG)])

(\GC.HANDLEOVERFLOW

  [LAMBDA (ARG)                                              (* lmm "13-OCT-82 16:03")

                                                             (* called as PUNT after microcode has put some things in

							     the overflow table)

    (UNINTERRUPTABLY
        [PROG ((CELL \HTOVERFLOW)
	       PTR)
	  LP  (COND
		((SETQ PTR (fetch
 (HTOVERFLOW PTR) of
 CELL))
		  (\HTFIND
 PTR (fetch
 (HTOVERFLOW CASE) of
 CELL))
		  (replace
 (HTOVERFLOW CLEAR) of
 CELL with
 T)
		  (SETQ CELL (\ADDBASE CELL WORDSPERCELL))
		  (GO LP)))
	      (PROGN (SETQ PTR (\GETDTD \LISTP))
		     (COND
		       ((IGREATERP (SETQ CELL (fetch
 DTDCNT0 of
 PTR))
				   2000Q)
			 (.INCREMENT.ALLOCATION.COUNT. CELL)
			 (.BOXIPLUS. (fetch
 DTDCNTLOC of
 PTR)
				     (fetch
 DTDCNT0 of
 PTR))
			 (replace
 DTDCNT0 of
 PTR with
 0]
	ARG)])

(\GCMAPSCAN

  [LAMBDA NIL                                                (* lmm "22-FEB-82 12:13")

                                                             (* scan gc tables looking for reclaimable items)

    (PROG (ENTRY PTR (PROBE \HTMAINSIZE)
		 LINK PREV)
      NEXTENTRY
          [SETQ ENTRY (\ADDBASE \HTMAIN (SETQ PROBE (OR (\GCSCAN1
 PROBE)
							(RETURN]
      RETRY
          (COND
	    ((fetch
 (GC LINKP) of
 ENTRY)                     (* trace down collision table)

	      (SETQ PREV NIL)
	      (SETQ LINK (\ADDBASE \HTCOLL (fetch
 (GC LINKPTR) of
 ENTRY)))
	      [PROG NIL
		LINKLOOP
		    (CHECK (EVENP (\LOLOC LINK))
			   (SELECTC (fetch
 (GC HIBITS) of
 LINK)
				    ((LIST \AtomHI \SmallPosHi \SmallNegHi)
				      NIL)
				    T)
			   (NOT (fetch
 (GC LINKP) of
 LINK)))
		    [COND
		      ((EQ (fetch
 (GC STKCNT) of
 LINK)
			   0)
			(SETQ PTR (\VAG2 (fetch
 (GC HIBITS) of
 LINK)
					 (LLSH PROBE 1)))
			(.DELLINK. LINK PREV ENTRY)
			(.GCRECLAIMLP. PTR)
			(COND
			  ((fetch
 (GC EMPTY) of
 ENTRY)
			    (GO NEXTENTRY))
			  (T (GO RETRY]
		    (SETQ PREV LINK)
		    (COND
		      ([NOT (ZEROP (SETQ LINK (fetch
 NXTPTR of
 LINK]
			(SETQ LINK (\ADDBASE \HTCOLL LINK))
			(GO LINKLOOP]
	      (GO NEXTENTRY)))
          (CHECK (SELECTC (fetch
 (GC HIBITS) of
 ENTRY)
			  ((LIST \AtomHI \SmallPosHi \SmallNegHi)
			    NIL)
			  T))
          (COND
	    ((ZEROP (fetch
 (GC STKCNT) of
 ENTRY))            (* REF CNT WENT TO 0 -- ERASE ENTRY IN MAIN TABLE, AND 

							     RECLAIM POINTER)

	      (SETQ PTR (\VAG2 (fetch
 (GC HIBITS) of
 ENTRY)
			       (LLSH PROBE 1)))
	      (replace
 (GC EMPTY) of
 ENTRY with
 T)
	      (.GCRECLAIMLP. PTR)))
          (GO NEXTENTRY])

(\GCMAPUNSCAN

  [LAMBDA NIL                      (* lmm "27-DEC-81 22:15")

                                   (* scan gc tables turning of stack bits)

    (PROG (ENTRY (PROBE \HTMAINSIZE))
      LP  [SETQ ENTRY (\ADDBASE \HTMAIN (SETQ PROBE (OR (\GCSCAN2
 PROBE)
							(RETURN]
      RETRY
          [COND
	    [(fetch
 (GC LINKP) of
 ENTRY)
                                   (* LINK -- trace down collision table)

	      (PROG [(LNK (\ADDBASE \HTCOLL (fetch
 (GC LINKPTR) of
 ENTRY]
		SCNLP
		    [COND
		      ((fetch
 (GC STKBIT) of
 LNK)
			(COND
			  ((EQ (fetch
 (GC CNT) of
 LNK)
			       1)
			    (UNSCANREF (\VAG2 (fetch
 (GC HIBITS) of
 LNK)
					      (LLSH PROBE 1)))
                                   (* could have modified this collision list, so don't try to follow chain)

			    (GO RETRY))
			  (T (replace
 (GC STKBIT) of
 LNK with
 NIL]
		    (COND
		      ([NOT (ZEROP (SETQ LNK (fetch
 NXTPTR of
 LNK]
			(SETQ LNK (\ADDBASE \HTCOLL LNK))
			(GO SCNLP]
	    ((fetch
 (GC STKBIT) of
 ENTRY)
	      (COND
		((EQ (fetch
 (GC CNT) of
 ENTRY)
		     1)
		  (replace
 EMPTY of
 ENTRY with
 T))
		(T (replace
 (GC STKBIT) of
 ENTRY with
 NIL]
          (GO LP])

(\GCRECLAIMCELL

  (LAMBDA (PTR)                                              (* JonL "18-Feb-84 10:12")

    (PROG (DTD I VAL N)
          (CHECK (OR (NOT (DEFINEDP (QUOTE \REFCNT)))
		     (EQ 1 (\REFCNT PTR))))
      LP  (SELECTC (SETQ N (NTYPX PTR))
		   (\LISTP (COND
			     ((EQ CDRCODING 0)
			       (GO NORMAL)))
			   (SETQ VAL (\DELREF (CAR PTR)))
			   (SETQ VAL (OR (\DELREF (CDR PTR))
					 VAL))
			   (COND
			     ((ILEQ (fetch
 CDRCODE of
 PTR)
				    \CDR.MAXINDIRECT)        (* indirect)

			       (COND
				 ((EQ (fetch
 CDRCODE of
 PTR)
				      \CDR.INDIRECT)
				   (SETQ PTR (PROG1 (fetch
 CARFIELD of
 PTR)
						    (\FREELISTCELL
 PTR)))
				   (CHECK (NEQ (fetch
 CDRCODE of
 PTR)
					       \CDR.INDIRECT)
					  (ILEQ (fetch
 CDRCODE of
 PTR)
						\CDR.MAXINDIRECT))))
                                                             (* local indirect)

			       (\FREELISTCELL
 (\ADDBASE (fetch
 PAGEBASE of
 PTR)
							(LLSH (IDIFFERENCE (fetch
 CDRCODE
									      of
 PTR)
									   \CDR.INDIRECT)
							      1)))))
			   (\FREELISTCELL
 PTR)
			   (RETURN VAL))
		   (\STACKP (\DECUSECOUNT (fetch
 (STACKP EDFXP) of
 PTR)))
		   (0                                        (* Out of MDS, check for arrayblock)

		      (COND
			((type?
 ARRAYBLOCK PTR)
			  (\RECLAIMARRAYBLOCK PTR)))
		      (RETURN))
		   (\VMEMPAGEP 

          (* VMEMPAGE used as a PMAP buffer so tell PMAP a buffer is no longer referenced. If PMAP doesn't want PTR put on 

	  the free list, it will return non-NIL.)



			       (AND (RELEASINGVMEMPAGE PTR)
				    (RETURN)))
		   NIL)
      NORMAL
          (SETQ DTD (\GETDTD N))
          (MAPC (fetch
 DTDPTRS of
 DTD)
		(FUNCTION (LAMBDA (K)
		    (SETQ VAL (OR (\DELREF (\GETBASEPTR PTR K))
				  VAL)))))
          (replace
 DTDFREE of
 DTD with
 (PROG1 PTR (\PUTBASEPTR PTR 0 (fetch
 DTDFREE of
 DTD))))
          (RETURN VAL))))

(\FREELISTCELL

  [LAMBDA (X)                      (* lmm " 1-JAN-82 23:54")

    (PROG ((BASE (fetch
 (POINTER PAGEBASE) of
 X)))
          (CHECK (LISTP X)
		 (EVENP (\LOLOC X)))
          (replace
 CDRCODE of
 X with
 (fetch
 NEXTCELL of
 BASE))
          (replace
 NEXTCELL of
 BASE with
 (fetch
 (POINTER WORD#) of
 X))
          (COND
	    ((AND (IGREATERP (add
 (fetch
 (CONSPAGE CNT) of
 BASE)
				  1)
			     2)
		  (EQ (fetch
 NEXTPAGE of
 BASE)
		      \CONSPAGE.LAST))
	      (replace
 NEXTPAGE of
 BASE with
 (fetch
 DTDNEXTPAGE of
 \LISTPDTD))
	      (replace
 DTDNEXTPAGE of
 \LISTPDTD with
 (PAGELOC BASE])

(DISABLEGC

  [LAMBDA NIL                      (* lmm "19-MAY-82 22:40")

    (replace
 (HTCOLL NEXTFREE) of
 \HTCOLL with
 \HTCOLLSIZE)
    [PROG ((VP \MDSTypeTable))
          (FRPTQ (UNFOLD \MDSTTsize WORDSPERPAGE)
		 (\PUTBASE VP 0 (LOGOR \TT.NOREF (\GETBASE VP 0)))
		 (SETQ VP (\ADDBASE VP 1]
    (SETQ \RECLAIM.COUNTDOWN)
    NIL])

(\GCSCAN1

  [LAMBDA (PROBE)                  (* lmm "27-DEC-81 22:14")

    (PROG (ENT)
      LP  (COND
	    ((ILEQ PROBE 0)
	      (RETURN NIL)))
          [SETQ ENT (\ADDBASE \HTMAIN (SETQ PROBE (SUB1 PROBE]
          (COND
	    ([AND (NOT (fetch
 (GC EMPTY) of
 ENT))
		  (OR (fetch
 (GC LINKP) of
 ENT)
		      (ZEROP (fetch
 (GC STKCNT) of
 ENT]
	      (RETURN PROBE))
	    (T (GO LP])

(\GCSCAN2

  [LAMBDA (PROBE)                  (* lmm "23-DEC-81 22:48")

    (PROG NIL
      LP  (COND
	    ((ILEQ PROBE 0)
	      (RETURN NIL))
	    ((NEQ [LOGAND (CONSTANT (LOGOR \HTSTKBIT 1))
			  (\GETBASE \HTMAIN (SETQ PROBE (SUB1 PROBE]
		  0)
	      (RETURN PROBE))
	    (T (GO LP])

(\REFCNT

  [LAMBDA (PTR)                                              (* bvm: "19-Feb-84 16:01")

    (PROG (ENTRY LINK CNT)
          (COND
	    ((OR (BITTEST (\GETBASE \MDSTypeTable (LRSH (fetch
 (POINTER PAGE#) of
 PTR)
							1))
			  \TT.NOREF)
		 (\GCDISABLED))                              (* PTR is not reference counted)

	      (RETURN 1)))
          [CHECK (ZEROP (LOGAND 1 (\LOLOC PTR]
          (SETQ ENTRY (\ADDBASE \HTMAIN (LRSH (\LOLOC PTR)
					      1)))
          [COND
	    ((fetch
 (GC EMPTY) of
 ENTRY)
	      (RETURN 1))
	    ((fetch
 (GC LINKP) of
 ENTRY)                     (* chase down the link)

	      (GO FINDLINK))
	    ((NEQ (\HILOC PTR)
		  (fetch
 (GC HIBITS) of
 ENTRY))              (* Doesn't match ptr in table, so no entry)

	      (RETURN 1))
	    ((ILESSP (SETQ CNT (fetch
 (GC CNT) of
 ENTRY))
		     \MAXHTCNT)
	      (RETURN CNT))
	    (T                                               (* Look in overflow table)

	       (RETURN (\GC.LOOKUP.BIGREFCNT
 PTR]
      FINDLINK
          (SETQ LINK (\ADDBASE \HTCOLL (fetch
 (GC LINKPTR) of
 ENTRY)))
      LINKLOOP
          [COND
	    ((EQ (fetch
 (GC HIBITS) of
 LINK)
		 (\HILOC PTR))                               (* found the link entry)

	      (RETURN (COND
			((ILESSP (SETQ CNT (fetch
 (GC CNT) of
 LINK))
				 \MAXHTCNT)
			  CNT)
			(T (\GC.LOOKUP.BIGREFCNT
 PTR]
          (COND
	    ((EQ (SETQ LINK (fetch
 NXTPTR of
 LINK))
		 0)                                          (* Didn't find an entry on this chain)

	      (RETURN 1))
	    (T (SETQ LINK (\ADDBASE \HTCOLL LINK))
	       (GO LINKLOOP])
)
(DEFINEQ

(RECLAIM

  [LAMBDA NIL                      (* lmm " 1-JUN-81 20:06")

    (\DORECLAIM
)
    0])

(\DORECLAIM

  [LAMBDA NIL
    (DECLARE
 (GLOBALVARS GCMESS \RECLAIM.COUNTDOWN))         (* lmm "15-OCT-82 12:12")

    (COND
      ((NOT (\GCDISABLED))
	(UNINTERRUPTABLY
            (SETQ \RECLAIM.COUNTDOWN NIL)
	    (PROG ((GCTIME1 (CLOCK 2 \GCTIME1)))
	          (AND GCMESS (FLIPCURSOR))
	          (\CONTEXTSWITCH \GCFXP)
	          (AND GCMESS (FLIPCURSOR))
	          (\BOXIPLUS (LOCF (fetch
 GCTIME of
 \MISCSTATS))
			     (\BOXIDIFFERENCE (CLOCK 2 \GCTIME2)
					      GCTIME1)))
	    (SETQ \RECLAIM.COUNTDOWN \RECLAIMMIN))])

(RECLAIMMIN

  [LAMBDA (N)                      (* lmm " 8-FEB-82 22:16")

    (PROG1 (OR \RECLAIMMIN T)
	   (COND
	     (N (SETQ \RECLAIM.COUNTDOWN (SETQ \RECLAIMMIN (COND
		      ((NEQ N T)
			(IMIN (IMAX N 144Q)
			      MAX.SMALL.INTEGER])

(GCMESS

  [LAMBDA (NUM STR)                (* lmm " 1-JUN-81 20:08")

    NIL])

(GCGAG

  [LAMBDA (MESSAGE)                                         (* rrb "11-JUN-81 10:13")

    (DECLARE
 (GLOBALVARS GCMESS))
    (PROG1 GCMESS (SETQ GCMESS MESSAGE])

(GCTRP

  [LAMBDA NIL                      (* lmm " 8-FEB-82 22:17")

                                   (* returns the number of storage allocations before the next gc)

    (OR (FIXP \RECLAIM.COUNTDOWN)
	MAX.INTEGER])
)
(DECLARE: EVAL@COMPILE DONTCOPY 

(RPAQQ GCCOMPILERDEFS
 ((EXPORT (MACROS ADDREF \ADDREF DELETEREF \DELREF SCANREF \STKREF UNSCANREF 
				       CREATEREF \CREATEREF .INCREMENT.ALLOCATION.COUNT. \GCDISABLED)
			       (RECORDS HTOVERFLOW GC HTCOLL))
		       (RECORDS GCOVFL)
		       (CONSTANTS \HTBIGENTRYSIZE (\HT2CNT (IPLUS \HT1CNT \HT1CNT))
				  (\HTCNTSHIFT 12Q)
				  (\HTNOSTKBIT (LOGXOR 177777Q \HTSTKBIT))
				  (\HTSTK1 (LOGOR \HTSTKBIT \HT1CNT))
				  (\HTSTKCNT (LOGOR \HTCNTMASK \HTSTKBIT))
				  \HTHIMASK \MAXHTCNT)
		       (MACROS .GETLINK. .DELLINK. .FREELINK. .MODENTRY. .NEWENTRY. .GCRECLAIMLP.)
		       (GLOBALVARS \RECLAIMMIN \RECLAIM.COUNTDOWN \GCTIME1 \GCTIME2)
		       (CONSTANTS \ADDREFCASE \DELREFCASE \SCANREFCASE \UNSCANREFCASE)))
(* FOLLOWING DEFINITIONS EXPORTED)


(DECLARE: EVAL@COMPILE 

(PUTPROPS ADDREF MACRO
 (OPENLAMBDA (PTR)
				   (PROG1 PTR (\ADDREF PTR))))

(PUTPROPS \ADDREF DMACRO
 ((X)
			  ((OPCODES GCREF 0)
			   X)))

(PUTPROPS DELETEREF MACRO
 (OPENLAMBDA (PTR)
				      (PROG1 PTR (\DELREF PTR))))

(PUTPROPS \DELREF DMACRO
 ((X)
			  ((OPCODES GCREF 1)
			   X)))

(PUTPROPS SCANREF MACRO
 (= . \STKREF))

(PUTPROPS \STKREF DMACRO
 ((X)
			  ((OPCODES GCREF 2)
			   X)))

(PUTPROPS UNSCANREF MACRO
 ((PTR)
			   (\HTFIND PTR 3)))

(PUTPROPS CREATEREF MACRO
 (= . \CREATEREF))

(PUTPROPS \CREATEREF MACRO
 (OPENLAMBDA (PTR)
				       (PROG1 (\DELREF PTR)
					      (.INCREMENT.ALLOCATION.COUNT. 1))))

(PUTPROPS .INCREMENT.ALLOCATION.COUNT. MACRO
 [OPENLAMBDA (N)
							 (DECLARE
 (GLOBALVARS \RECLAIM.COUNTDOWN))
							 (AND \RECLAIM.COUNTDOWN
							      (COND
								((IGREATERP \RECLAIM.COUNTDOWN N)
								  (SETQ \RECLAIM.COUNTDOWN
								    (IDIFFERENCE \RECLAIM.COUNTDOWN N)
								    ))
								(T (SETQ \RECLAIM.COUNTDOWN)
								   (\DORECLAIM])

(PUTPROPS \GCDISABLED MACRO
 (NIL                             (* lmm "30-NOV-81 14:08")

				 (IGEQ (fetch
 (HTCOLL NEXTFREE) of
 \HTCOLL)
				       \HTCOLLSIZE)))
)
[DECLARE: EVAL@COMPILE 

(BLOCKRECORD HTOVERFLOW
 ((CASE BYTE)
			 (PTR XPOINTER))
			[ACCESSFNS HTOVERFLOW ((CLEAR NIL (\PUTBASEPTR DATUM 0 NIL])

(BLOCKRECORD GC
 ((CNT BITS 6)
		 (STKBIT FLAG)
		 (HIBITS BITS 10Q)
		 (LINKP FLAG)
		 (NXTPTR WORD))
		(BLOCKRECORD GC ((STKCNT BITS 7)))
		[ACCESSFNS GC ((EMPTY (ZEROP (\GETBASE DATUM 0))
				      (\PUTBASE DATUM 0 0))
			    (CONTENTS (\GETBASE DATUM 0)
				      (\PUTBASE DATUM 0 NEWVALUE))
			    (LINKPTR (LOGAND (\GETBASE DATUM 0)
					     177776Q)
				     (\PUTBASE DATUM 0 (LOGOR NEWVALUE 1])

(BLOCKRECORD HTCOLL
 ((FREEPTR WORD)
		     (NEXTFREE WORD)))
]


(* END EXPORTED DEFINITIONS)

[DECLARE: EVAL@COMPILE 

(BLOCKRECORD GCOVFL
 ((OVFLPTR FULLXPOINTER)
		     (OVFLCNTHI WORD)
		     (OVFLCNTLO WORD)))
]
(DECLARE: EVAL@COMPILE 

(RPAQQ \HTBIGENTRYSIZE
 4)

(RPAQ \HT2CNT
 (IPLUS \HT1CNT \HT1CNT))

(RPAQQ \HTCNTSHIFT
 12Q)

(RPAQ \HTNOSTKBIT
 (LOGXOR 177777Q \HTSTKBIT))

(RPAQ \HTSTK1
 (LOGOR \HTSTKBIT \HT1CNT))

(RPAQ \HTSTKCNT
 (LOGOR \HTCNTMASK \HTSTKBIT))

(RPAQQ \HTHIMASK
 776Q)

(RPAQQ \MAXHTCNT
 77Q)

(CONSTANTS \HTBIGENTRYSIZE (\HT2CNT (IPLUS \HT1CNT \HT1CNT))
	   (\HTCNTSHIFT 12Q)
	   (\HTNOSTKBIT (LOGXOR 177777Q \HTSTKBIT))
	   (\HTSTK1 (LOGOR \HTSTKBIT \HT1CNT))
	   (\HTSTKCNT (LOGOR \HTCNTMASK \HTSTKBIT))
	   \HTHIMASK \MAXHTCNT)
)
(DECLARE: EVAL@COMPILE 

(PUTPROPS .GETLINK. MACRO
 [(VAR)                             (* get a new cell from free list into VAR)

			   (SETQ VAR (fetch
 (HTCOLL FREEPTR) of
 \HTCOLL))
			   [COND
			     ((ZEROP VAR)
			       (SETQ VAR (fetch
 (HTCOLL NEXTFREE) of
 \HTCOLL))
			       (replace
 (HTCOLL NEXTFREE) of
 \HTCOLL with
 (IPLUS VAR 2]
			   (replace
 (HTCOLL FREEPTR) of
 \HTCOLL with
 (fetch
 (GC NXTPTR)
									of
 (SETQ VAR
									     (\ADDBASE \HTCOLL VAR])

(PUTPROPS .DELLINK. MACRO
 [(LINK PREV ENTRY)
			   (PROGN [COND
				    (PREV (replace
 (GC NXTPTR) of
 PREV with
 (fetch
 (GC NXTPTR)
									       of
 LINK)))
				    (T (replace
 (GC LINKPTR) of
 ENTRY with
 (fetch
 (GC NXTPTR)
									      of
 LINK]
                                                             (* skip over this guy)

				  (.FREELINK. LINK)          (* put him on the free list)

				  (COND
				    ([ZEROP (fetch
 (GC NXTPTR) of
 (SETQ LINK
								    (\ADDBASE \HTCOLL
									      (fetch
 (GC LINKPTR)
										 of
 ENTRY]
                                                             (* if there is now only one entry on this chain, put him

							     back on the free list too)

				      (replace
 (GC CONTENTS) of
 ENTRY with
 (fetch
 (GC CONTENTS)
									      of
 LINK))
				      (.FREELINK. LINK])

(PUTPROPS .FREELINK. DMACRO
 (OPENLAMBDA (LINKCELL)
					(* put LINKCELL back on HTCOLL freelist)
					(replace (GC CONTENTS)
						 of LINKCELL with 0)
					(replace (GC NXTPTR)
						 of LINKCELL with (fetch (HTCOLL FREEPTR)
									 of \HTCOLL))
					(replace (HTCOLL FREEPTR)
						 of \HTCOLL with (\LOLOC LINKCELL))))

(PUTPROPS .MODENTRY. DMACRO
 [(ENTRY CASE PTR)
			     (PROG ((GCCNT (fetch (GC CNT)
						  of ENTRY)))
				   (DECLARE (LOCALVARS GCCNT))
				   (COND [(NEQ GCCNT \MAXHTCNT)
					  (SELECTC CASE [\ADDREFCASE (COND
								       ((EQ GCCNT (SUB1 \MAXHTCNT))
									(\GC.ENTER.BIGREFCNT PTR 
											    ENTRY))
								       (T (replace (GC CNT)
										   of ENTRY with
										   (ADD1 GCCNT]
						   (\DELREFCASE (replace (GC CNT)
									 of ENTRY with (SUB1 GCCNT)))
						   (\SCANREFCASE (replace (GC STKBIT)
									  of ENTRY with T))
						   (\UNSCANREFCASE (replace (GC STKBIT)
									    of ENTRY with NIL))
						   (\GCERROR))
					  (RETURN (EQ (fetch (GC STKCNT)
							     of ENTRY)
						      (LLSH 1 1]
					 (T (\GC.MODIFY.BIGREFCNT ENTRY CASE PTR])

(PUTPROPS .NEWENTRY. MACRO
 [(ENTRY PTR CASE)
			    (PROGN (CHECK (fetch
 (GC EMPTY) of
 ENTRY))
				   (replace
 (GC HIBITS) of
 ENTRY with
 (\HILOC PTR))
				   (SELECTC CASE
					    (\ADDREFCASE (replace
 (GC CNT) of
 ENTRY with
 2)
							 NIL)
					    (\DELREFCASE PTR)
					    (\SCANREFCASE (replace
 (GC CNT) of
 ENTRY with
 1)
							  (replace
 (GC STKBIT) of
 ENTRY with
 T)
							  NIL)
					    (\GCERROR])

(PUTPROPS .GCRECLAIMLP. DMACRO
 [(X)
				(PROG NIL LP (COND ((SETQ X (\GCRECLAIMCELL X))
						    (\ADDREF X)
						    (GO LP])
)
(DECLARE: DOEVAL@COMPILE DONTCOPY

(ADDTOVAR GLOBALVARS \RECLAIMMIN \RECLAIM.COUNTDOWN \GCTIME1 \GCTIME2)
)
(DECLARE: EVAL@COMPILE 

(RPAQQ \ADDREFCASE
 0)

(RPAQQ \DELREFCASE
 1)

(RPAQQ \SCANREFCASE
 2)

(RPAQQ \UNSCANREFCASE
 3)

(CONSTANTS \ADDREFCASE \DELREFCASE \SCANREFCASE \UNSCANREFCASE)
)
)
(DECLARE: DONTEVAL@LOAD DOCOPY 

(RPAQQ \RECLAIMMIN
 5670Q)

(RPAQQ \RECLAIM.COUNTDOWN
 5670Q)

(RPAQQ GCMESS
 NIL)

(RPAQ \GCTIME1
 (CREATECELL \FIXP))

(RPAQ \GCTIME2
 (CREATECELL \FIXP))
)
(DEFINEQ

(\GCERROR

  [LAMBDA (REASON FLG)             (* lmm " 8-DEC-81 14:21")

    (PROG NIL
          (COND
	    ((AND FLG REASON (\GCDISABLED))
	      (RETURN)))
          (until
 (RAID (OR REASON "Bad CASE arg to \HTFIND")))
          (DISABLEGC
])
)
(DECLARE: DOEVAL@COMPILE DONTCOPY

(LOCALVARS . T)
)
(PUTPROPS LLGC COPYRIGHT ("Xerox Corporation" 3675Q 3676Q 3677Q 3700Q))
(DECLARE: DONTCOPY
  (FILEMAP (NIL (3032Q 4027Q (INITGC 3044Q . 4025Q)) (4547Q 12533Q (\HTFIND 4561Q . 12531Q)) (12534Q 
23204Q (\GC.ENTER.BIGREFCNT 12546Q . 15462Q) (\GC.MODIFY.BIGREFCNT 15464Q . 21300Q) (
\GC.LOOKUP.BIGREFCNT 21302Q . 22734Q) (\GC.BIGREFCNT.MISSING 22736Q . 23202Q)) (23314Q 50201Q (
\GCMAPTABLE 23326Q . 25563Q) (\GC.HANDLEOVERFLOW 25565Q . 27403Q) (\GCMAPSCAN 27405Q . 33036Q) (
\GCMAPUNSCAN 33040Q . 35436Q) (\GCRECLAIMCELL 35440Q . 41371Q) (\FREELISTCELL 41373Q . 42673Q) (
DISABLEGC 42675Q . 43436Q) (\GCSCAN1 43440Q . 44277Q) (\GCSCAN2 44301Q . 44750Q) (\REFCNT 44752Q . 
50177Q)) (50202Q 53016Q (RECLAIM 50214Q . 50366Q) (\DORECLAIM 50370Q . 51436Q) (RECLAIMMIN 51440Q . 
52031Q) (GCMESS 52033Q . 52161Q) (GCGAG 52163Q . 52446Q) (GCTRP 52450Q . 53014Q)) (70700Q 71315Q (
\GCERROR 70712Q . 71313Q)))))
STOP