f48f399540
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@23 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2771 lines
65 KiB
C
2771 lines
65 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: heapgc.c *
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* Last rev: *
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* mods: *
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* comments: Global Stack garbage collector *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif /* SCCS */
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#include "absmi.h"
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#include "yapio.h"
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#define EARLY_RESET 1
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#define EASY_SHUNTING 1
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#define HYBRID_SCHEME 1
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#ifdef MULTI_ASSIGNMENT_VARIABLES
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/*
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Based in opt.mavar.h. This is a set of routines to find out if a
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ma trail entry has appeared before in the same trail segment. All ma
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entries for the same cell are then linked. At the end of mark_trail() only
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one will remain.
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*/
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#define GC_MAVARS_HASH_SIZE 512
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typedef struct gc_ma_h_entry {
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CELL* addr;
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tr_fr_ptr trptr;
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struct gc_ma_h_entry* ma_list;
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struct gc_ma_h_entry *next;
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} gc_ma_h_inner_struct;
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extern struct gc_ma_h_entry *live_list;
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typedef struct {
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UInt timestmp;
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struct gc_ma_h_entry val;
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} gc_ma_hash_entry;
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static gc_ma_hash_entry gc_ma_hash_table[GC_MAVARS_HASH_SIZE];
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static UInt timestamp; /* an unsigned int */
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static inline unsigned int
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GC_MAVAR_HASH(CELL *addr) {
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#if SIZEOF_INT_P==8
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return((((unsigned int)((CELL)(addr)))>>3)%GC_MAVARS_HASH_SIZE);
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#else
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return((((unsigned int)((CELL)(addr)))>>2)%GC_MAVARS_HASH_SIZE);
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#endif
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}
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gc_ma_h_inner_struct *gc_ma_h_top;
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static inline struct gc_ma_h_entry *
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GC_ALLOC_NEW_MASPACE(void)
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{
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gc_ma_h_inner_struct *new = gc_ma_h_top;
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if ((char *)gc_ma_h_top > TrailTop-1024)
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growtrail(64 * 1024L);
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gc_ma_h_top++;
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return(new);
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}
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static inline tr_fr_ptr*
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gc_lookup_ma_var(CELL *addr, tr_fr_ptr trp) {
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unsigned int i = GC_MAVAR_HASH(addr);
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struct gc_ma_h_entry *nptr, *optr;
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if (gc_ma_hash_table[i].timestmp != timestamp) {
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gc_ma_hash_table[i].timestmp = timestamp;
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gc_ma_hash_table[i].val.addr = addr;
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gc_ma_hash_table[i].val.next = NULL;
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gc_ma_hash_table[i].val.trptr = trp;
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gc_ma_hash_table[i].val.ma_list = live_list;
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live_list = &(gc_ma_hash_table[i].val);
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return(NULL);
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}
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if (gc_ma_hash_table[i].val.addr == addr)
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return(&(gc_ma_hash_table[i].val.trptr));
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optr = &(gc_ma_hash_table[i].val);
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nptr = gc_ma_hash_table[i].val.next;
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while (nptr != NULL) {
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if (nptr->addr == addr) {
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return(&(nptr->trptr));
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}
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optr = nptr;
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nptr = nptr->next;
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}
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nptr = GC_ALLOC_NEW_MASPACE();
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nptr->addr = addr;
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nptr->next = optr;
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nptr->trptr = trp;
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nptr->ma_list = live_list;
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live_list = nptr;
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return(NULL);
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}
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static inline void
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GC_NEW_MAHASH(gc_ma_h_inner_struct *top) {
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UInt time = ++timestamp;
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if (time == 0) {
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unsigned int i;
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/* damn, we overflowed */
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for (i = 0; i < GC_MAVARS_HASH_SIZE; i++)
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gc_ma_hash_table[i].timestmp = 0;
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time = ++timestamp;
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}
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gc_ma_h_top = top;
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live_list = NULL;
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}
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#endif
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/* #define DB_SEARCH_METHOD 1 */
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/* global variables for garbage collection */
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#ifndef DEBUG
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static
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#endif
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unsigned int gc_calls = 0; /* number of times GC has been called */
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static CELL tot_gc_time = 0; /* total time spent in GC */
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/* in a single gc */
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UInt total_marked; /* number of heap objects marked */
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struct gc_ma_h_entry *live_list;
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STATIC_PROTO(Int p_inform_gc, (void));
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STATIC_PROTO(Int p_gc, (void));
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#ifndef FIXED_STACKS
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#ifdef EASY_SHUNTING
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static choiceptr current_B;
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static tr_fr_ptr sTR;
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#endif
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STATIC_PROTO(void push_registers, (Int, yamop *));
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STATIC_PROTO(void marking_phase, (tr_fr_ptr, CELL *, yamop *, CELL *));
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STATIC_PROTO(void compaction_phase, (tr_fr_ptr, CELL *, yamop *, CELL *));
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STATIC_PROTO(void pop_registers, (Int, yamop *));
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#if DB_SEARCH_METHOD
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#else
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STATIC_PROTO(void store_ref_in_dbtable, (DBRef));
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STATIC_PROTO(DBRef find_ref_in_dbtable, (DBRef));
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#endif
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STATIC_PROTO(void init_dbtable, (tr_fr_ptr));
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STATIC_PROTO(void mark_db_fixed, (CELL *));
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STATIC_PROTO(void mark_regs, (tr_fr_ptr));
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STATIC_PROTO(void mark_trail, (tr_fr_ptr, tr_fr_ptr, CELL *, choiceptr));
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STATIC_PROTO(void mark_environments, (CELL *, OPREG, CELL *));
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STATIC_PROTO(void mark_choicepoints, (choiceptr, tr_fr_ptr));
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STATIC_PROTO(void into_relocation_chain, (CELL *, CELL *));
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STATIC_PROTO(void sweep_trail, (choiceptr, tr_fr_ptr));
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STATIC_PROTO(void sweep_environments, (CELL *, OPREG, CELL *));
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STATIC_PROTO(void sweep_choicepoints, (choiceptr));
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STATIC_PROTO(choiceptr update_B_H, (choiceptr, CELL *, CELL *, CELL *));
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STATIC_PROTO(void compact_heap, (void));
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STATIC_PROTO(void update_relocation_chain, (CELL *, CELL *));
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static Int tot_gc_recovered = 0; /* number of heap objects in all garbage collections */
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#include "heapgc.h"
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static int discard_trail_entries = 0;
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/* support for hybrid garbage collection scheme */
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#ifdef HYBRID_SCHEME
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static CELL_PTR *iptop;
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inline static void
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PUSH_POINTER(CELL *v) {
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if (iptop >= (CELL_PTR *)ASP) return;
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*iptop++ = v;
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}
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inline static void
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POP_POINTER(void) {
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if (iptop >= (CELL_PTR *)ASP) return;
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--iptop;
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}
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inline static void
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POPSWAP_POINTER(CELL_PTR *vp) {
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if (iptop >= (CELL_PTR *)ASP) return;
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--iptop;
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if (vp != iptop)
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*vp = *iptop;
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}
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/*
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original code from In Hyuk Choi,
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found at http://userpages.umbc.edu/~ichoi1/project/cs441.htm
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*/
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static inline void
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exchange(CELL_PTR * b, UInt i, UInt j)
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{
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CELL *t = b[j];
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b[j] = b[i];
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b[i] = t;
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}
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static UInt
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partition(CELL *a[], UInt p, UInt r)
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{
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CELL *x;
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UInt i, j;
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x = a[p];
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i = p+1;
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j = r;
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while (a[j] > x) {
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j--;
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}
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while (a[i] < x && i < j) {
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i++;
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}
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while(i < j) {
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exchange(a, i, j);
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i++;
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j--;
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while (a[j] > x) {
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j--;
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}
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while (a[i] < x && i < j) {
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i++;
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}
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}
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if (a[i] > x)
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i--;
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exchange(a, p, i);
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return(i);
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}
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static void
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insort(CELL *a[], UInt p, UInt q)
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{
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UInt j;
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for (j = p+1; j <= q; j ++) {
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CELL *key;
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UInt i;
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key = a[j];
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i = j;
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while (i > p && a[i-1] > key) {
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a[i] = a[i-1];
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i --;
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}
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a[i] = key;
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}
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}
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static void
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quicksort(CELL *a[], UInt p, UInt r)
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{
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UInt q;
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if (p < r) {
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if (r - p < 100) {
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insort(a, p, r);
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return;
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}
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exchange(a, p, (p+r)/2);
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q = partition (a, p, r);
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quicksort(a, p, q-1);
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quicksort(a, q + 1, r);
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}
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}
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#else
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#define PUSH_POINTER(P)
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#define POP_POINTER()
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#define POPSWAP_POINTER(P)
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#endif /* HYBRID_SCHEME */
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/* find all accessible objects on the heap and squeeze out all the rest */
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/* push the active registers onto the trail for inclusion during gc */
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static void
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push_registers(Int num_regs, yamop *nextop)
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{
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int i;
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#ifdef COROUTINING
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TrailTerm(TR) = WokenGoals;
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TrailTerm(TR+1) = MutableList;
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TrailTerm(TR+2) = AttsMutableList;
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TrailTerm(TR+3) = DelayedVars;
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TR += 4;
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#endif
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for (i = 1; i <= num_regs; i++)
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TrailTerm(TR++) = (CELL) XREGS[i];
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/* push any live registers we might have hanging around */
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if (nextop->opc == opcode(_move_back) ||
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nextop->opc == opcode(_skip)) {
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CELL *lab = (CELL *)(nextop->u.l.l);
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CELL max = lab[0];
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Int curr = lab[1];
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lab += 2;
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if (max) {
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CELL i;
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for (i=0L; i <= max; i++) {
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if (i == 8*CellSize) {
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curr = lab[0];
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lab++;
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}
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if (curr & 1) {
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TrailTerm(TR++) = XREGS[i];
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}
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curr >>= 1;
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}
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}
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}
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}
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/* pop the corrected register values from the trail and update the registers */
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static void
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pop_registers(Int num_regs, yamop *nextop)
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{
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int i;
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tr_fr_ptr ptr = TR;
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#ifdef COROUTINING
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#ifdef MULTI_ASSIGNMENT_VARIABLES
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WokenGoals = TrailTerm(ptr++);
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MutableList = TrailTerm(ptr++);
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AttsMutableList = TrailTerm(ptr++);
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DelayedVars = TrailTerm(ptr++);
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#endif
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#endif
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for (i = 1; i <= num_regs; i++)
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XREGS[i] = TrailTerm(ptr++);
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/* pop any live registers we might have hanging around */
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if (nextop->opc == opcode(_move_back) ||
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nextop->opc == opcode(_skip)) {
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CELL *lab = (CELL *)(nextop->u.l.l);
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CELL max = lab[0];
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Int curr = lab[1];
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lab += 2;
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if (max) {
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CELL i;
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for (i=0L; i <= max; i++) {
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if (i == 8*CellSize) {
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curr = lab[0];
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lab++;
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}
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if (curr & 1) {
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XREGS[i] = TrailTerm(ptr++);
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}
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curr >>= 1;
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}
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}
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}
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}
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#ifdef DEBUG
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static int
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count_cells_marked(void)
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{
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CELL *current;
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int found_marked = 0;
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for (current = H - 1; current >= H0; current--) {
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if (MARKED(*current)) {
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found_marked++;
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}
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}
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return(found_marked);
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}
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#endif
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#if DB_SEARCH_METHOD
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/* In this method we store first pointers to the DB, and when we find an entry
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in the trail we go and see if anyone is pointing at it. We try to be efficient
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space-wise, by removing entries to code that does not need them
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*/
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typedef struct DB_entry {
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CELL *addr;
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struct DB_entry *next;
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} *dbentry;
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#define MAX_DB_ENTRIES 1024
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static dbentry db_vec, free_entries;
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static dbentry dbtable[MAX_DB_ENTRIES];
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static int dbscale;
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static CODEADDR MyHpBase;
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static int
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dbslot(CELL *ptr)
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{
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return((Addr(ptr)-Addr(MyHpBase))/dbscale);
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}
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static dbentry
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new_dbvec_entry(void)
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{
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dbentry val;
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if (free_entries != NULL) {
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val = free_entries;
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free_entries = free_entries->next;
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return(val);
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}
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val = db_vec;
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db_vec++;
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return(val);
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}
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static void
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add_new_dbuse(CELL *ptr)
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{
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int off = dbslot(ptr);
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dbentry prev = NULL;
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dbentry curr = dbtable[off];
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while (curr != NULL && curr->addr < ptr) {
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prev = curr;
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curr = curr->next;
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}
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if (curr == NULL) {
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dbentry db_entry = new_dbvec_entry();
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db_entry->addr = ptr;
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db_entry->next = NULL;
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dbtable[off] = db_entry;
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return;
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} else if (curr->addr > ptr) {
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dbentry db_entry = new_dbvec_entry();
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db_entry->addr = ptr;
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db_entry->next = curr;
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if (prev == NULL) {
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dbtable[off] = db_entry;
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} else {
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prev->next = db_entry;
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}
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}
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}
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static void
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mark_db_fixed(CELL *trail_ptr) {
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add_new_dbuse(trail_ptr);
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}
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/* there are two cases: either off0 == offf or offf > off0 */
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static int
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found_dbentries(CELL *beg, CELL *end)
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{
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int off0 = dbslot(beg);
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int offf = dbslot(end);
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int off = off0;
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int found = FALSE;
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dbentry prev = NULL;
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dbentry curr = dbtable[off];
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while (curr != NULL && curr->addr < beg) {
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prev = curr;
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curr = curr->next;
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}
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do {
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while (curr != NULL) {
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if (curr->addr > end) {
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return(found);
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} else {
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dbentry nexte = curr->next;
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found = TRUE;
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if (prev == NULL)
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dbtable[off] = nexte;
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else
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prev->next = nexte;
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curr->next = free_entries;
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free_entries = curr;
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curr = nexte;
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}
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}
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if (off < offf) {
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off++;
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prev = NULL;
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curr = dbtable[off];
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} else
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return(found);
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} while (TRUE);
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}
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#else
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/* straightforward binary tree scheme that, given a key, finds a
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matching dbref */
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typedef struct db_entry {
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DBRef val;
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struct db_entry *left;
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CELL *lim;
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struct db_entry *right;
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} *dbentry;
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static dbentry db_vec, db_vec0;
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/* init the table */
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static void
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store_ref_in_dbtable(DBRef entry)
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{
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dbentry parent = db_vec0;
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dbentry new = db_vec;
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if ((ADDR)new > TrailTop-1024)
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growtrail(64 * 1024L);
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new->val = entry;
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new->lim = entry->Contents+entry->NOfCells;
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new->left = new->right = NULL;
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if (db_vec == db_vec0) {
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db_vec++;
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return;
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}
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db_vec++;
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parent = db_vec0;
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beg:
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if (entry < parent->val) {
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if (parent->right == NULL) {
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parent->right = new;
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|
} else {
|
|
parent = parent->right;
|
|
goto beg;
|
|
}
|
|
} else {
|
|
if (parent->left == NULL) {
|
|
parent->left = new;
|
|
} else {
|
|
parent = parent->left;
|
|
goto beg;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* find an element in the dbentries table */
|
|
static DBRef
|
|
find_ref_in_dbtable(DBRef entry)
|
|
{
|
|
dbentry current = db_vec0;
|
|
|
|
while (current != NULL) {
|
|
if (current->val < entry && current->lim > (CELL *)entry)
|
|
return(current->val);
|
|
if (entry < current->val)
|
|
current = current->right;
|
|
else
|
|
current = current->left;
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
static void
|
|
mark_db_fixed(CELL *ptr) {
|
|
DBRef el;
|
|
|
|
el = find_ref_in_dbtable((DBRef)ptr);
|
|
if (el != NULL)
|
|
el->Flags |= GcFoundMask;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void
|
|
init_dbtable(tr_fr_ptr trail_ptr) {
|
|
#if DB_SEARCH_METHOD
|
|
MyHpBase = HeapBase;
|
|
db_vec = (dbentry)TR;
|
|
free_entries = NULL;
|
|
dbscale = ((Addr(HeapTop)-Addr(MyHpBase))+MAX_DB_ENTRIES-1)/MAX_DB_ENTRIES;
|
|
#else
|
|
db_vec0 = db_vec = (dbentry)TR;
|
|
while (trail_ptr > (tr_fr_ptr)TrailBase) {
|
|
register CELL trail_cell;
|
|
|
|
trail_ptr--;
|
|
|
|
trail_cell = TrailTerm(trail_ptr);
|
|
|
|
if (!IsVarTerm(trail_cell) && IsPairTerm(trail_cell)) {
|
|
CELL *pt0 = RepPair(trail_cell);
|
|
/* DB pointer */
|
|
CELL flags;
|
|
|
|
#ifdef FROZEN_REGS /* TRAIL */
|
|
/* avoid frozen segments */
|
|
if (
|
|
#ifdef SBA
|
|
(ADDR) pt0 >= HeapTop
|
|
#else
|
|
(ADDR) pt0 >= TrailBase
|
|
#endif
|
|
) {
|
|
continue;
|
|
}
|
|
#endif /* FROZEN_REGS */
|
|
|
|
flags = Flags((CELL)pt0);
|
|
/* for the moment, if all references to the term in the stacks
|
|
are only pointers, reset the flag */
|
|
if (FlagOn(DBClMask, flags) && !FlagOn(LogUpdMask, flags)) {
|
|
if (FlagOn(DBNoVars, flags)) {
|
|
CODEADDR entry = ((CODEADDR)pt0 - (CELL) &(((DBRef) NIL)->Flags));
|
|
store_ref_in_dbtable((DBRef)entry);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (db_vec == db_vec0) {
|
|
/* could not find any entries: probably using LOG UPD semantics */
|
|
db_vec0 = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
/*#define INSTRUMENT_GC 1*/
|
|
/*#define CHECK_CHOICEPOINTS 1*/
|
|
|
|
#ifdef INSTRUMENT_GC
|
|
typedef enum {
|
|
gc_var,
|
|
gc_ref,
|
|
gc_atom,
|
|
gc_int,
|
|
gc_num,
|
|
gc_list,
|
|
gc_appl,
|
|
gc_func,
|
|
gc_susp
|
|
} gc_types;
|
|
unsigned long chain[16];
|
|
unsigned long env_vars;
|
|
unsigned long vars[gc_susp+1];
|
|
|
|
unsigned long num_bs;
|
|
unsigned long old_vars, new_vars;
|
|
|
|
static CELL *TrueHB;
|
|
|
|
static void
|
|
inc_vars_of_type(CELL *curr,gc_types val) {
|
|
if (curr >= H0 && curr < TrueHB) {
|
|
old_vars++;
|
|
} else if (curr >= TrueHB && curr < H) {
|
|
new_vars++;
|
|
} else {
|
|
return;
|
|
}
|
|
vars[val]++;
|
|
}
|
|
|
|
static void
|
|
put_type_info(unsigned long total)
|
|
{
|
|
YP_fprintf(YP_stderr,"[GC] type info for %lu cells\n", total);
|
|
YP_fprintf(YP_stderr,"[GC] %lu vars\n", vars[gc_var]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu refs\n", vars[gc_ref]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu references from env\n", env_vars);
|
|
YP_fprintf(YP_stderr,"[GC] %lu atoms\n", vars[gc_atom]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu small ints\n", vars[gc_int]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu other numbers\n", vars[gc_num]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu lists\n", vars[gc_list]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu compound terms\n", vars[gc_appl]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu functors\n", vars[gc_func]);
|
|
YP_fprintf(YP_stderr,"[GC] %lu suspensions\n", vars[gc_susp]);
|
|
}
|
|
|
|
static void
|
|
inc_var(CELL *current, CELL *next)
|
|
{
|
|
int len = 1;
|
|
CELL *mynext=next;
|
|
|
|
if (ONHEAP(current)) {
|
|
if (next == current) {
|
|
inc_vars_of_type(current,gc_var);
|
|
chain[0]++;
|
|
} else {
|
|
inc_vars_of_type(current,gc_ref);
|
|
while(ONHEAP(mynext) && IsVarTerm(*mynext)) {
|
|
CELL *prox = GET_NEXT(*mynext);
|
|
if (prox == mynext) {
|
|
chain[0]++;
|
|
break;
|
|
}
|
|
len++;
|
|
mynext = prox;
|
|
}
|
|
if (len>=15)
|
|
(chain[15])++;
|
|
else
|
|
(chain[len])++;
|
|
}
|
|
}
|
|
}
|
|
#endif /* INSTRUMENT_GC */
|
|
|
|
int STD_PROTO(vsc_stop,(void));
|
|
|
|
int
|
|
vsc_stop(void) {
|
|
return(1);
|
|
}
|
|
|
|
static void
|
|
check_global(void) {
|
|
CELL *current;
|
|
|
|
#ifdef INSTRUMENT_GC
|
|
vars[gc_var] = 0;
|
|
vars[gc_ref] = 0;
|
|
vars[gc_atom] = 0;
|
|
vars[gc_int] = 0;
|
|
vars[gc_num] = 0;
|
|
vars[gc_list] = 0;
|
|
vars[gc_appl] = 0;
|
|
vars[gc_func] = 0;
|
|
vars[gc_susp] = 0;
|
|
#endif
|
|
for (current = H - 1; current >= H0; current--) {
|
|
CELL ccurr = *current;
|
|
|
|
if (MARKED(ccurr)) {
|
|
CELL ccell = UNMARK_CELL(ccurr);
|
|
if (ccell < (CELL)AtomBase && ccell > EndSpecials && IsVarTerm(ccell)) {
|
|
/* oops, we found a blob */
|
|
int nofcells = (UNMARK_CELL(*current)-EndSpecials) / sizeof(CELL);
|
|
CELL *ptr = current - nofcells ;
|
|
current = ptr;
|
|
ccurr = *current;
|
|
/* process the functor next */
|
|
}
|
|
if (MARKED(ccurr)) {
|
|
printf("Oops, found marked cell at %p\n", current);
|
|
break;
|
|
}
|
|
}
|
|
#if INSTRUMENT_GC
|
|
if (IsVarTerm(ccurr)) {
|
|
if (IsBlobFunctor((Functor)ccurr)) vars[gc_num]++;
|
|
else if (ccurr != 0 && ccurr < (CELL)HeapTop) vars[gc_func]++;
|
|
else if (IsUnboundVar((CELL)current)) vars[gc_var]++;
|
|
else vars[gc_ref]++;
|
|
} else if (IsApplTerm(ccurr)) {
|
|
vars[gc_appl]++;
|
|
} else if (IsPairTerm(ccurr)) {
|
|
vars[gc_list]++;
|
|
} else if (IsAtomTerm(ccurr)) {
|
|
vars[gc_atom]++;
|
|
} else if (IsIntTerm(ccurr)) {
|
|
vars[gc_int]++;
|
|
}
|
|
#endif
|
|
}
|
|
#if INSTRUMENT_GC
|
|
put_type_info(H-H0);
|
|
vars[gc_var] = 0;
|
|
vars[gc_ref] = 0;
|
|
vars[gc_atom] = 0;
|
|
vars[gc_int] = 0;
|
|
vars[gc_num] = 0;
|
|
vars[gc_list] = 0;
|
|
vars[gc_appl] = 0;
|
|
vars[gc_func] = 0;
|
|
vars[gc_susp] = 0;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
|
|
/* mark a heap object and all heap objects accessible from it */
|
|
|
|
void
|
|
mark_variable(CELL_PTR current)
|
|
{
|
|
CELL_PTR next;
|
|
register CELL ccur;
|
|
unsigned int arity;
|
|
unsigned int i;
|
|
|
|
begin:
|
|
ccur = *current;
|
|
if (MARKED(ccur))
|
|
return;
|
|
MARK(current);
|
|
total_marked++;
|
|
PUSH_POINTER(current);
|
|
next = GET_NEXT(ccur);
|
|
|
|
if (IsVarTerm(ccur)) {
|
|
if (ONHEAP(next)) {
|
|
#ifdef EASY_SHUNTING
|
|
CELL cnext;
|
|
/* do variable shunting between variables in the global */
|
|
if (!MARKED((cnext = *next))) {
|
|
if (IsVarTerm(cnext) && (CELL)next == cnext) {
|
|
/* new global variable to new global variable */
|
|
if (current < H && current >= HB && next >= HB) {
|
|
#ifdef INSTRUMENT_GC
|
|
inc_var(current, current);
|
|
#endif
|
|
*next = (CELL)current;
|
|
*current = MARK_CELL((CELL)current);
|
|
return;
|
|
} else {
|
|
/* can't help here */
|
|
#ifdef INSTRUMENT_GC
|
|
inc_var(current, next);
|
|
#endif
|
|
current = next;
|
|
}
|
|
} else {
|
|
/* binding to a determinate reference */
|
|
if (next >= HB) {
|
|
*current = cnext;
|
|
total_marked--;
|
|
POP_POINTER();
|
|
} else {
|
|
#ifdef INSTRUMENT_GC
|
|
inc_var(current, next);
|
|
#endif
|
|
current = next;
|
|
}
|
|
}
|
|
} else if (IsVarTerm(cnext) && UNMARK_CELL(cnext) != (CELL)next) {
|
|
/* This step is possible because we clean up the trail */
|
|
*current = UNMARK_CELL(cnext);
|
|
total_marked--;
|
|
POP_POINTER();
|
|
} else
|
|
#endif
|
|
/* what I'd do without variable shunting */
|
|
{
|
|
#ifdef INSTRUMENT_GC
|
|
inc_var(current, next);
|
|
#endif
|
|
current = next;
|
|
}
|
|
goto begin;
|
|
}
|
|
#ifdef DEBUG
|
|
else if (next < (CELL *)AtomBase)
|
|
YP_fprintf(YP_stderr, "ooops while marking %lx, %p at %p\n", (unsigned long int)ccur, current, next);
|
|
#endif
|
|
#ifdef INSTRUMENT_GC
|
|
else
|
|
inc_var(current, next);
|
|
#endif
|
|
return;
|
|
} else if (IsPairTerm(ccur)) {
|
|
#ifdef INSTRUMENT_GC
|
|
inc_vars_of_type(current,gc_list);
|
|
#endif
|
|
if (ONHEAP(next)) {
|
|
mark_variable(next);
|
|
current = next + 1;
|
|
goto begin;
|
|
} else if (ONCODE(next)) {
|
|
mark_db_fixed(RepPair(ccur));
|
|
}
|
|
return;
|
|
} else if (IsApplTerm(ccur)) {
|
|
register CELL cnext = *next;
|
|
|
|
#ifdef INSTRUMENT_GC
|
|
if (!IsExtensionFunctor((Functor)cnext))
|
|
inc_vars_of_type(current,gc_appl);
|
|
else
|
|
inc_vars_of_type(current,gc_num);
|
|
#endif
|
|
if (ONCODE(next)) {
|
|
if ((Functor)cnext == FunctorDBRef) {
|
|
DBRef tref = DBRefOfTerm(ccur);
|
|
/* make sure the reference is marked as in use */
|
|
tref->Flags |= GcFoundMask;
|
|
} else {
|
|
mark_db_fixed(next);
|
|
}
|
|
return;
|
|
}
|
|
if ( MARKED(cnext) || !ONHEAP(next) )
|
|
return;
|
|
|
|
if (next < H0) return;
|
|
if (IsExtensionFunctor((Functor)cnext)) {
|
|
switch (cnext) {
|
|
case (CELL)FunctorLongInt:
|
|
MARK(next);
|
|
total_marked += 3;
|
|
PUSH_POINTER(next);
|
|
PUSH_POINTER(next+1);
|
|
PUSH_POINTER(next+2);
|
|
return;
|
|
case (CELL)FunctorDouble:
|
|
MARK(next);
|
|
total_marked += 2+SIZEOF_DOUBLE/SIZEOF_LONG_INT;
|
|
PUSH_POINTER(next);
|
|
PUSH_POINTER(next+1);
|
|
PUSH_POINTER(next+2);
|
|
#if SIZEOF_DOUBLE==2*SIZEOF_LONG_INT
|
|
PUSH_POINTER(next+3);
|
|
#endif
|
|
return;
|
|
#ifdef USE_GMP
|
|
case (CELL)FunctorBigInt:
|
|
MARK(next);
|
|
/* size is given by functor + friends */
|
|
total_marked += 2+
|
|
(sizeof(MP_INT)+
|
|
(((MP_INT *)(next+1))->_mp_alloc*sizeof(mp_limb_t)))/CellSize;
|
|
{
|
|
int i = 1;
|
|
PUSH_POINTER(next);
|
|
for (i = 0; i <= (sizeof(MP_INT)+
|
|
(((MP_INT *)(next+1))->_mp_alloc*sizeof(mp_limb_t)))/CellSize;
|
|
i++)
|
|
PUSH_POINTER(next+i);
|
|
PUSH_POINTER(next+i);
|
|
}
|
|
return;
|
|
#endif
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
#ifdef INSTRUMENT_GC
|
|
inc_vars_of_type(next,gc_func);
|
|
#endif
|
|
arity = ArityOfFunctor((Functor)(cnext));
|
|
MARK(next);
|
|
++total_marked;
|
|
PUSH_POINTER(next);
|
|
for (i = 1; i < arity; ++i)
|
|
mark_variable(next + i);
|
|
current = next + arity;
|
|
goto begin;
|
|
}
|
|
#ifdef INSTRUMENT_GC
|
|
else if (IsAtomTerm(ccur))
|
|
inc_vars_of_type(current,gc_atom);
|
|
else
|
|
inc_vars_of_type(current, gc_int);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
mark_external_reference(CELL *ptr) {
|
|
CELL reg = *ptr;
|
|
|
|
/* first, mark variables in environments */
|
|
if (IsVarTerm(reg)) {
|
|
if (ONHEAP(reg)) {
|
|
#ifdef HYBRID_SCHEME
|
|
CELL_PTR *old = iptop;
|
|
#endif
|
|
mark_variable(ptr);
|
|
total_marked--;
|
|
POPSWAP_POINTER(old);
|
|
} else {
|
|
MARK(ptr);
|
|
}
|
|
} else if (IsApplTerm(reg)) {
|
|
CELL *next = RepAppl(reg);
|
|
|
|
if (ONHEAP(next)) {
|
|
#ifdef HYBRID_SCHEME
|
|
CELL_PTR *old = iptop;
|
|
#endif
|
|
mark_variable(ptr);
|
|
total_marked--;
|
|
POPSWAP_POINTER(old);
|
|
} else {
|
|
MARK(ptr);
|
|
if (ONCODE(next)) {
|
|
if ((Functor)(*next) == FunctorDBRef) {
|
|
DBRef tref = DBRefOfTerm(reg);
|
|
/* make sure the reference is marked as in use */
|
|
tref->Flags |= GcFoundMask;
|
|
} else {
|
|
mark_db_fixed(next);
|
|
}
|
|
}
|
|
}
|
|
} else if (IsPairTerm(reg)) {
|
|
CELL *next = RepPair(reg);
|
|
|
|
if (ONHEAP(next)) {
|
|
#ifdef HYBRID_SCHEME
|
|
CELL_PTR *old = iptop;
|
|
#endif
|
|
mark_variable(ptr);
|
|
total_marked--;
|
|
POPSWAP_POINTER(old);
|
|
} else {
|
|
MARK(ptr);
|
|
if (ONCODE(next)) {
|
|
mark_db_fixed(next);
|
|
}
|
|
}
|
|
} else {
|
|
/* atom or integer */
|
|
MARK(ptr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* mark all heap objects accessible from the trail (which includes the active
|
|
* general purpose registers)
|
|
*/
|
|
|
|
static void
|
|
mark_regs(tr_fr_ptr old_TR)
|
|
{
|
|
tr_fr_ptr trail_ptr;
|
|
|
|
|
|
/* first, whatever we dumped on the trail. Easier just to do
|
|
the registers separately? */
|
|
for (trail_ptr = old_TR; trail_ptr < TR; trail_ptr++)
|
|
mark_external_reference(&TrailTerm(trail_ptr));
|
|
}
|
|
|
|
#ifdef COROUTINING
|
|
static void
|
|
mark_delays(CELL *max)
|
|
{
|
|
CELL *ptr = (CELL *)GlobalBase;
|
|
for (; ptr < max; ptr++) {
|
|
mark_external_reference(ptr);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* mark all heap objects accessible from a chain of environments */
|
|
|
|
static void
|
|
mark_environments(CELL_PTR gc_ENV, OPREG size, CELL *pvbmap)
|
|
{
|
|
CELL_PTR saved_var;
|
|
|
|
while (gc_ENV != NULL) { /* no more environments */
|
|
Int bmap = 0;
|
|
int currv = 0;
|
|
|
|
#ifdef DEBUG
|
|
if (size < 0 || size > 512)
|
|
YP_fprintf(YP_stderr,"Oops, env size %ld\n", (unsigned long int)size);
|
|
#endif
|
|
/* for each saved variable */
|
|
if (size > EnvSizeInCells) {
|
|
int tsize = size - EnvSizeInCells;
|
|
|
|
currv = sizeof(CELL)*8-tsize%(sizeof(CELL)*8);
|
|
pvbmap += tsize/(sizeof(CELL)*8);
|
|
bmap = *pvbmap;
|
|
bmap = (Int)(((CELL)bmap) << currv);
|
|
}
|
|
|
|
for (saved_var = gc_ENV - size; saved_var < gc_ENV - EnvSizeInCells; saved_var++) {
|
|
if (currv == sizeof(CELL)*8) {
|
|
pvbmap--;
|
|
bmap = *pvbmap;
|
|
currv = 0;
|
|
}
|
|
/* we may have already been here */
|
|
if (bmap < 0 && !MARKED(*saved_var)) {
|
|
#ifdef INSTRUMENT_GC
|
|
Term ccur = *saved_var;
|
|
|
|
if (IsVarTerm(ccur)) {
|
|
int len = 1;
|
|
CELL *mynext= GET_NEXT(ccur);
|
|
|
|
if (ONHEAP(mynext)) {
|
|
env_vars++;
|
|
while(ONHEAP(mynext) && IsVarTerm(*mynext)) {
|
|
CELL *prox = GET_NEXT(*mynext);
|
|
if (prox == mynext) {
|
|
chain[0]++;
|
|
break;
|
|
}
|
|
len++;
|
|
mynext = prox;
|
|
}
|
|
if (len>=15)
|
|
(chain[15])++;
|
|
else
|
|
(chain[len])++;
|
|
}
|
|
}
|
|
#endif
|
|
mark_external_reference(saved_var);
|
|
}
|
|
bmap <<= 1;
|
|
currv++;
|
|
}
|
|
/* have we met this environment before?? */
|
|
/* we use the B field in the environment to tell whether we have
|
|
been here before or not.
|
|
|
|
We do it at the end because we don't want to lose any variables
|
|
that would have been trimmed at the first environment visit.
|
|
*/
|
|
if (MARKED(gc_ENV[E_CB]))
|
|
return;
|
|
MARK(gc_ENV+E_CB);
|
|
|
|
size = EnvSize((CELL_PTR) (gc_ENV[E_CP])); /* size = EnvSize(CP) */
|
|
pvbmap = EnvBMap((CELL_PTR) (gc_ENV[E_CP]));
|
|
gc_ENV = (CELL_PTR) gc_ENV[E_E]; /* link to prev
|
|
* environment */
|
|
}
|
|
}
|
|
|
|
/*
|
|
Cleaning the trail should be quick and simple, right? Well, not
|
|
really :-(. The problem is that the trail includes a dumping ground
|
|
of the WAM registers and of extra choice-point fields, which need
|
|
to be cleaned from somewhere.
|
|
|
|
And cleaning the trail itself is not easy. The problem is that we
|
|
may not have cleaned the trail after cuts. If we naively followed
|
|
these pointers, we could have direct references to the global
|
|
stack! A solution is to verify whether we are poiting at a
|
|
legitimate trail entry. Unfortunately this requires some extra work
|
|
following choice-points.
|
|
|
|
*/
|
|
|
|
static void
|
|
mark_trail(tr_fr_ptr trail_ptr, tr_fr_ptr trail_base, CELL *gc_H, choiceptr gc_B)
|
|
{
|
|
GC_NEW_MAHASH((gc_ma_h_inner_struct *)db_vec);
|
|
while (trail_ptr > trail_base) {
|
|
register CELL trail_cell;
|
|
|
|
trail_ptr--;
|
|
|
|
trail_cell = TrailTerm(trail_ptr);
|
|
|
|
if (IsVarTerm(trail_cell)) {
|
|
CELL *hp = (CELL *)trail_cell;
|
|
/* if a variable older than the current CP has not been marked yet,
|
|
than its new binding is not accessible and we can reset it. Note
|
|
we must use gc_H to avoid trouble with dangling variables
|
|
in the heap */
|
|
if (((hp < gc_H && hp >= H0) || (hp > (CELL *)gc_B && hp < LCL0) ) && !MARKED(*hp)) {
|
|
#ifdef EARLY_RESET
|
|
/* reset to be a variable */
|
|
RESET_VARIABLE(hp);
|
|
discard_trail_entries++;
|
|
RESET_VARIABLE(&TrailTerm(trail_ptr));
|
|
#ifdef FROZEN_REGS
|
|
RESET_VARIABLE(&TrailVal(trail_ptr));
|
|
#endif
|
|
#else
|
|
/* if I have no early reset I have to follow the trail chain */
|
|
mark_external_reference(&TrailTerm(trail_ptr));
|
|
UNMARK(&TrailTerm(trail_ptr));
|
|
#endif /* EARLY_RESET */
|
|
} else {
|
|
if (hp < (CELL *)HeapTop) {
|
|
/* I decided to allow pointers from the Heap back into the trail.
|
|
The point of doing so is to have dynamic arrays */
|
|
mark_external_reference(hp);
|
|
}
|
|
#ifdef EASY_SHUNTING
|
|
if (hp < gc_H && hp >= H0) {
|
|
CELL *cptr = (CELL *)trail_cell;
|
|
|
|
TrailTerm(sTR) = *hp;
|
|
TrailTerm(sTR+1) = trail_cell;
|
|
sTR += 2;
|
|
RESET_VARIABLE(cptr);
|
|
MARK(cptr);
|
|
}
|
|
#endif
|
|
#ifdef FROZEN_REGS
|
|
mark_external_reference(&TrailVal(trail_ptr));
|
|
#endif
|
|
}
|
|
} else if (IsPairTerm(trail_cell)) {
|
|
#if DB_SEARCH_METHOD
|
|
CELL *pt0 = RepPair(trail_cell);
|
|
|
|
#ifdef FROZEN_REGS /* TRAIL */
|
|
/* avoid frozen segments */
|
|
if (
|
|
#ifdef SBA
|
|
(ADDR) pt0 >= HeapTop
|
|
#else
|
|
(ADDR) pt0 >= TrailBase
|
|
#endif
|
|
) {
|
|
trail_ptr = (tr_fr_ptr) pt0;
|
|
continue;
|
|
}
|
|
#endif /* FROZEN_REGS */
|
|
/* DB pointer */
|
|
CELL flags = Flags((CELL)pt0);
|
|
/* for the moment, if all references to the term in the stacks
|
|
are only pointers, reset the flag */
|
|
if (FlagOn(DBClMask, flags) && !FlagOn(LogUpdMask, flags)) {
|
|
if (FlagOn(DBNoVars, flags)) {
|
|
DBRef entry = (DBRef) ((CODEADDR)pt0 - (CELL) &(((DBRef) NIL)->Flags));
|
|
if (found_dbentries(entry->Contents,
|
|
entry->Contents+entry->NOfCells))
|
|
entry->Flags |= GcFoundMask;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
#if MULTI_ASSIGNMENT_VARIABLES
|
|
else {
|
|
tr_fr_ptr *lkp;
|
|
/* This is a bit complex. The idea is that we may have several
|
|
trailings for the same mavar in the same trail segment. Essentially,
|
|
the problem arises because of !. What we want is to ignore all but
|
|
the last entry, or in this case, all but the first entry with the last
|
|
value.
|
|
|
|
Problem: we can only mark when we know it is the *last*.
|
|
|
|
Solution: we keep a list of all found entries and search in the end
|
|
*/
|
|
if (!(lkp = gc_lookup_ma_var(RepAppl(trail_cell), trail_ptr))) {
|
|
if (HEAP_PTR(trail_cell)) {
|
|
/* fool the gc into thinking this is a variable */
|
|
TrailTerm(trail_ptr) = (CELL)RepAppl(trail_cell);
|
|
mark_external_reference(&(TrailTerm(trail_ptr)));
|
|
/* reset the gc to believe the original tag */
|
|
TrailTerm(trail_ptr) = AbsAppl((CELL *)TrailTerm(trail_ptr));
|
|
#ifdef FROZEN_REGS
|
|
mark_external_reference(&TrailVal(trail_ptr));
|
|
#endif
|
|
}
|
|
trail_ptr --;
|
|
} else {
|
|
tr_fr_ptr trp = (*lkp)-1;
|
|
TrailTerm(trp) = TrailTerm(trail_ptr-1);
|
|
/* we can safely ignore this little monster */
|
|
discard_trail_entries += 2;
|
|
RESET_VARIABLE(&TrailTerm(trail_ptr));
|
|
#ifdef FROZEN_REGS
|
|
RESET_VARIABLE(&TrailVal(trail_ptr));
|
|
#endif
|
|
trail_ptr--;
|
|
RESET_VARIABLE(&TrailTerm(trail_ptr));
|
|
#ifdef FROZEN_REGS
|
|
RESET_VARIABLE(&TrailVal(trail_ptr));
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
#if MULTI_ASSIGNMENT_VARIABLES
|
|
while (live_list != NULL) {
|
|
CELL trail_cell = TrailTerm(live_list->trptr-1);
|
|
if (HEAP_PTR(trail_cell)) {
|
|
mark_external_reference(&TrailTerm(live_list->trptr-1));
|
|
}
|
|
live_list = live_list->ma_list;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* mark all heap objects accessible from each choicepoint & its chain of
|
|
* environments
|
|
*/
|
|
|
|
#ifdef TABLING
|
|
#ifdef TABLING_BATCHED_SCHEDULING
|
|
#define init_substitution_pointer(GCB, SUBS_PTR, DEP_FR) \
|
|
SUBS_PTR = (CELL *) (CONS_CP(GCB) + 1)
|
|
#else /* TABLING_LOCAL_SCHEDULING */
|
|
#define init_substitution_pointer(GCB, SUBS_PTR, DEP_FR) \
|
|
SUBS_PTR = (CELL *) (CONS_CP(GCB) + 1); \
|
|
if (DepFr_leader_cp(DEP_FR) == GCB) \
|
|
SUBS_PTR += SgFr_arity(GEN_CP_SG_FR(GCB))
|
|
#endif /* TABLING_SCHEDULING */
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
#endif
|
|
|
|
#ifdef CHECK_CHOICEPOINTS
|
|
#ifndef ANALYST
|
|
|
|
static char *op_names[_std_top + 1] =
|
|
{
|
|
#define OPCODE(OP,TYPE) #OP
|
|
#include "YapOpcodes.h"
|
|
#undef OPCODE
|
|
};
|
|
|
|
#endif
|
|
#endif
|
|
|
|
|
|
static void
|
|
mark_choicepoints(register choiceptr gc_B, tr_fr_ptr saved_TR)
|
|
{
|
|
|
|
while (gc_B != NULL) {
|
|
op_numbers opnum;
|
|
register OPCODE op;
|
|
yamop *rtp = gc_B->cp_ap;
|
|
|
|
#ifdef EASY_SHUNTING
|
|
current_B = gc_B;
|
|
#endif
|
|
HB = gc_B->cp_h;
|
|
#ifdef INSTRUMENT_GC
|
|
num_bs++;
|
|
#endif
|
|
#ifdef TABLING
|
|
/* ignore empty choicepoints */
|
|
if (rtp == NULL) {
|
|
gc_B = gc_B->cp_b;
|
|
continue;
|
|
}
|
|
#endif
|
|
op = rtp->opc;
|
|
opnum = op_from_opcode(op);
|
|
#ifdef CHECK_CHOICEPOINTS
|
|
switch (opnum) {
|
|
case _or_else:
|
|
case _or_last:
|
|
case _Nstop:
|
|
case _switch_last:
|
|
case _switch_l_list:
|
|
case _retry_c:
|
|
case _retry_userc:
|
|
case _trust_logical_pred:
|
|
case _retry_profiled:
|
|
printf("B %p (%s) with %d\n", gc_B, op_names[opnum], total_marked);
|
|
break;
|
|
#ifdef TABLING
|
|
case _table_completion:
|
|
case _table_answer_resolution:
|
|
{
|
|
PredEntry *pe = ENV_ToP(gc_B->cp_cp);
|
|
op_numbers caller_op = op_from_opcode(ENV_ToOp(gc_B->cp_cp));
|
|
/* first condition checks if this was a meta-call */
|
|
if ((caller_op != _call && caller_op != _fcall) || pe == NULL) {
|
|
printf("B %p (%s) with %d\n", gc_B, op_names[opnum], total_marked);
|
|
} else if (pe->ArityOfPE)
|
|
printf("B %p (%s for %s/%d) with %d\n", gc_B, op_names[opnum], RepAtom(NameOfFunctor(pe->FunctorOfPred))->StrOfAE, pe->ArityOfPE, total_marked);
|
|
else
|
|
printf("B %p (%s for %s/0) with %d\n", gc_B, op_names[opnum], RepAtom((Atom)(pe->FunctorOfPred))->StrOfAE, total_marked);
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
{
|
|
PredEntry *pe = (PredEntry *)gc_B->cp_ap->u.ld.p;
|
|
if (pe == NULL) {
|
|
printf("B %p (%s) with %d\n", gc_B, op_names[opnum], total_marked);
|
|
} else if (pe->ArityOfPE)
|
|
printf("B %p (%s for %s/%d) with %d\n", gc_B, op_names[opnum], RepAtom(NameOfFunctor(pe->FunctorOfPred))->StrOfAE, pe->ArityOfPE, total_marked);
|
|
else
|
|
printf("B %p (%s for %s/0) with %d\n", gc_B, op_names[opnum], RepAtom((Atom)(pe->FunctorOfPred))->StrOfAE, total_marked);
|
|
}
|
|
}
|
|
#endif /* CHECK_CHOICEPOINTS */
|
|
mark_trail(saved_TR, gc_B->cp_tr, gc_B->cp_h, gc_B);
|
|
saved_TR = gc_B->cp_tr;
|
|
restart_cp:
|
|
if (opnum == _or_else || opnum == _or_last) {
|
|
/* ; choice point */
|
|
mark_environments((CELL_PTR) (gc_B->cp_a1),
|
|
#ifdef YAPOR
|
|
-gc_B->cp_cp->u.ldl.s / ((OPREG)sizeof(CELL)),
|
|
EnvBMapOffset((CELL *)(gc_B->cp_cp->u.ldl.bl))
|
|
#else
|
|
-gc_B->cp_cp->u.sla.s / ((OPREG)sizeof(CELL)),
|
|
EnvBMapOffset((CELL *)(gc_B->cp_cp->u.sla.l2))
|
|
#endif
|
|
);
|
|
} else {
|
|
/* choicepoint with arguments */
|
|
register CELL_PTR saved_reg;
|
|
OPREG nargs;
|
|
|
|
if (opnum == _Nstop)
|
|
mark_environments((CELL_PTR) gc_B->cp_env,
|
|
EnvSizeInCells,
|
|
NULL);
|
|
else
|
|
#ifdef TABLING
|
|
if (opnum != _table_completion)
|
|
#endif
|
|
mark_environments((CELL_PTR) gc_B->cp_env,
|
|
EnvSize((CELL_PTR) (gc_B->cp_cp)),
|
|
EnvBMap((CELL_PTR) (gc_B->cp_cp)));
|
|
/* extended choice point */
|
|
switch (opnum) {
|
|
case _Nstop:
|
|
if (gc_B->cp_b != NULL) {
|
|
|
|
nargs = IntOfTerm(gc_B->cp_a1);
|
|
break;
|
|
} else {
|
|
/* this is the last choice point, the work is done ;-) */
|
|
return;
|
|
}
|
|
case _switch_last:
|
|
case _switch_l_list:
|
|
nargs = rtp->u.slll.s;
|
|
break;
|
|
case _retry_c:
|
|
case _retry_userc:
|
|
if (gc_B->cp_ap == RETRY_C_RECORDED_CODE
|
|
|| gc_B->cp_ap == RETRY_C_RECORDED_K_CODE
|
|
|| gc_B->cp_ap == RETRY_C_DRECORDED_CODE
|
|
|| gc_B->cp_ap == RETRY_C_RECORDEDP_CODE) {
|
|
/* we have a reference from the choice-point stack to a term */
|
|
choiceptr old_b = B;
|
|
DBRef ref;
|
|
B = gc_B;
|
|
ref = (DBRef)EXTRA_CBACK_ARG(3,1);
|
|
if (IsVarTerm((CELL)ref))
|
|
ref->Flags |= GcFoundMask;
|
|
else {
|
|
if (ONCODE((CELL)ref)) {
|
|
mark_db_fixed(RepAppl((CELL)ref));
|
|
}
|
|
}
|
|
B = old_b;
|
|
}
|
|
nargs = rtp->u.lds.s+rtp->u.lds.extra;
|
|
break;
|
|
case _trust_logical_pred:
|
|
case _retry_profiled:
|
|
rtp = NEXTOP(rtp,l);
|
|
op = rtp->opc;
|
|
opnum = op_from_opcode(op);
|
|
goto restart_cp;
|
|
#ifdef TABLING
|
|
case _table_answer_resolution:
|
|
{
|
|
CELL *answ_fr;
|
|
CELL vars;
|
|
|
|
/* fetch the solution */
|
|
init_substitution_pointer(gc_B, answ_fr, CONS_CP(gc_B)->ccp_dep_fr);
|
|
vars = *answ_fr++;
|
|
while (vars--) {
|
|
mark_external_reference(answ_fr);
|
|
answ_fr++;
|
|
}
|
|
nargs = 0;
|
|
}
|
|
break;
|
|
case _table_completion:
|
|
{
|
|
register gen_cp_ptr gcp = GEN_CP(gc_B);
|
|
|
|
#ifdef TABLING_BATCHED_SCHEDULING
|
|
nargs = gcp->gcp_sg_fr->subgoal_arity;
|
|
#else
|
|
nargs = gcp->gcp_dep_fr->subgoal_frame->subgoal_arity;
|
|
#endif
|
|
saved_reg = (CELL *)(gcp+1)+nargs;
|
|
nargs = *saved_reg++;
|
|
while (nargs--) {
|
|
mark_external_reference(saved_reg);
|
|
saved_reg++;
|
|
}
|
|
}
|
|
break;
|
|
case _table_retry_me:
|
|
case _table_trust_me:
|
|
{
|
|
register gen_cp_ptr gcp = GEN_CP(gc_B);
|
|
|
|
nargs = rtp->u.ld.s;
|
|
/* for each saved register */
|
|
for (saved_reg = (CELL *)(gcp+1);
|
|
/* assumes we can count registers in CP this
|
|
way */
|
|
saved_reg < (CELL *)(gcp+1) + nargs;
|
|
saved_reg++) {
|
|
mark_external_reference(saved_reg);
|
|
}
|
|
nargs = *saved_reg++;
|
|
while (nargs--) {
|
|
mark_external_reference(saved_reg);
|
|
saved_reg++;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef DEBUG
|
|
case _retry_me:
|
|
case _trust_me:
|
|
case _profiled_retry_me:
|
|
case _profiled_trust_me:
|
|
case _retry_me0:
|
|
case _trust_me0:
|
|
case _retry_me1:
|
|
case _trust_me1:
|
|
case _retry_me2:
|
|
case _trust_me2:
|
|
case _retry_me3:
|
|
case _trust_me3:
|
|
case _retry_me4:
|
|
case _trust_me4:
|
|
case _retry_and_mark:
|
|
case _profiled_retry_and_mark:
|
|
case _retry:
|
|
case _trust_in:
|
|
case _trust:
|
|
case _retry_first:
|
|
case _trust_first_in:
|
|
case _trust_first:
|
|
case _retry_tail:
|
|
case _trust_tail_in:
|
|
case _trust_tail:
|
|
case _retry_head:
|
|
case _trust_head_in:
|
|
case _trust_head:
|
|
nargs = rtp->u.ld.s;
|
|
break;
|
|
default:
|
|
YP_fprintf(YP_stderr, "OOps in GC: Unexpected opcode: %d\n", opnum);
|
|
nargs = 0;
|
|
#else
|
|
default:
|
|
nargs = rtp->u.ld.s;
|
|
#endif
|
|
}
|
|
|
|
/* for each saved register */
|
|
for (saved_reg = &gc_B->cp_a1;
|
|
/* assumes we can count registers in CP this
|
|
way */
|
|
saved_reg < &gc_B->cp_a1 + nargs;
|
|
saved_reg++) {
|
|
mark_external_reference(saved_reg);
|
|
}
|
|
}
|
|
gc_B = gc_B->cp_b;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* insert a cell which points to a heap object into relocation chain of that
|
|
* object
|
|
*/
|
|
|
|
static void
|
|
into_relocation_chain(CELL_PTR current, CELL_PTR next)
|
|
{
|
|
#ifdef TAGS_FAST_OPS
|
|
register CELL ccur = *current, cnext = *next;
|
|
|
|
if (IsVarTerm(ccur)) {
|
|
*current = ( MARKED(ccur) ? MARK_CELL(UNMARKED(cnext)) :
|
|
UNMARKED(cnext) );
|
|
*next = (MARKED(cnext) ? MBIT : 0) | RBIT | (Int) current;
|
|
} else if (IsPairTerm(ccur)) {
|
|
*current = ( MARKED(ccur) ? MARK_CELL(UNMARKED(cnext)) :
|
|
UNMARKED(cnext) );
|
|
*next = AbsPair((CELL *)
|
|
((MARKED(cnext) ? MBIT : 0) | RBIT | (Int) current));
|
|
} else if (IsApplTerm(ccur)) {
|
|
*current = ( MARKED(ccur) ? MARK_CELL(UNMARKED(cnext)) :
|
|
UNMARKED(cnext) );
|
|
*next = AbsAppl((CELL *)
|
|
((MARKED(cnext) ? MBIT : 0) | RBIT | (Int) current));
|
|
} else {
|
|
YP_fprintf(YP_stderr," OH MY GOD !!!!!!!!!!!!\n");
|
|
}
|
|
#else
|
|
CELL current_tag;
|
|
|
|
current_tag = TAG(*current);
|
|
*current = (*current & MBIT) | (*next & ~MBIT);
|
|
#if INVERT_RBIT
|
|
*next = ((*next & MBIT) | (CELL) current | current_tag) & ~RBIT;
|
|
#else
|
|
*next = (*next & MBIT) | RBIT | (CELL) current | current_tag;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
|
|
/* insert trail cells which point to heap objects into relocation chains */
|
|
|
|
static void
|
|
sweep_trail(choiceptr gc_B, tr_fr_ptr old_TR)
|
|
{
|
|
tr_fr_ptr trail_ptr;
|
|
CELL *cp_H = gc_B->cp_h;
|
|
Int OldHeapUsed = HeapUsed;
|
|
#ifdef DEBUG
|
|
Int hp_entrs = 0, hp_erased = 0, hp_not_in_use = 0,
|
|
hp_in_use_erased = 0, code_entries = 0;
|
|
#endif
|
|
|
|
|
|
#if DB_SEARCH_METHOD
|
|
#if DEBUG
|
|
{
|
|
int i;
|
|
for (i=0; i<MAX_DB_ENTRIES; i++)
|
|
if (dbtable[i] != NULL)
|
|
fprintf(YP_stderr, "oops at entry %d: %p\n", i, dbtable[i]->addr);
|
|
}
|
|
#endif
|
|
#endif
|
|
/* first, whatever we dumped on the trail. Easier just to do
|
|
the registers separately? */
|
|
for (trail_ptr = old_TR; trail_ptr < TR; trail_ptr++) {
|
|
if (MARKED(TrailTerm(trail_ptr))) {
|
|
UNMARK(&TrailTerm(trail_ptr));
|
|
if (HEAP_PTR(TrailTerm(trail_ptr))) {
|
|
into_relocation_chain(&TrailTerm(trail_ptr), GET_NEXT(TrailTerm(trail_ptr)));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* next, follows the real trail entries */
|
|
trail_ptr = old_TR;
|
|
while (trail_ptr > (tr_fr_ptr)TrailBase) {
|
|
register CELL trail_cell;
|
|
|
|
trail_ptr--;
|
|
|
|
trail_cell = TrailTerm(trail_ptr);
|
|
|
|
if (gc_B && trail_ptr < gc_B->cp_tr) {
|
|
do {
|
|
gc_B = gc_B->cp_b;
|
|
} while (gc_B && trail_ptr < gc_B->cp_tr);
|
|
cp_H = gc_B->cp_h;
|
|
}
|
|
|
|
if (IsVarTerm(trail_cell)) {
|
|
/* we need to check whether this is a honest to god trail entry */
|
|
if ((CELL *)trail_cell < cp_H && MARKED(*(CELL *)trail_cell) && (CELL *)trail_cell >= H0) {
|
|
if (HEAP_PTR(trail_cell)) {
|
|
into_relocation_chain(&TrailTerm(trail_ptr), GET_NEXT(trail_cell));
|
|
}
|
|
} else if ((CELL *)trail_cell < (CELL *)HeapTop) {
|
|
/* we may have pointers from the heap back into the cell */
|
|
UNMARK(CellPtr(trail_cell));
|
|
if (HEAP_PTR(trail_cell)) {
|
|
into_relocation_chain(CellPtr(trail_cell), GET_NEXT(*(CELL *)trail_cell));
|
|
}
|
|
} else {
|
|
/* clean the trail, avoid dangling pointers! */
|
|
if ((CELL *)trail_cell < (CELL *)gc_B && (CELL *)trail_cell >= H0) {
|
|
RESET_VARIABLE(&TrailTerm(trail_ptr));
|
|
#ifdef FROZEN_REGS
|
|
RESET_VARIABLE(&TrailVal(trail_ptr));
|
|
#endif
|
|
discard_trail_entries++;
|
|
}
|
|
}
|
|
#ifdef FROZEN_REGS
|
|
if (MARKED(TrailVal(trail_ptr))) {
|
|
UNMARK(&TrailVal(trail_ptr));
|
|
if (HEAP_PTR(TrailVal(trail_ptr))) {
|
|
into_relocation_chain(&TrailVal(trail_ptr), GET_NEXT(TrailVal(trail_ptr)));
|
|
}
|
|
}
|
|
#endif
|
|
} else if (IsPairTerm(trail_cell)) {
|
|
CELL *pt0 = RepPair(trail_cell);
|
|
CELL flags;
|
|
|
|
|
|
#ifdef FROZEN_REGS /* TRAIL */
|
|
/* process all segments */
|
|
if (
|
|
#ifdef SBA
|
|
(ADDR) pt0 >= HeapTop
|
|
#else
|
|
(ADDR) pt0 >= TrailBase
|
|
#endif
|
|
) {
|
|
continue;
|
|
}
|
|
#endif /* FROZEN_REGS */
|
|
flags = Flags((CELL)pt0);
|
|
#ifdef DEBUG
|
|
if (FlagOn(DBClMask, flags) && !FlagOn(LogUpdMask, flags)) {
|
|
hp_entrs++;
|
|
if (!FlagOn(GcFoundMask, flags)) {
|
|
hp_not_in_use++;
|
|
if (FlagOn(ErasedMask, flags)) {
|
|
hp_erased++;
|
|
}
|
|
} else {
|
|
if (FlagOn(ErasedMask, flags)) {
|
|
hp_in_use_erased++;
|
|
}
|
|
}
|
|
} else {
|
|
code_entries++;
|
|
}
|
|
#endif
|
|
|
|
if (!FlagOn(GcFoundMask, flags)) {
|
|
if (FlagOn(DBClMask, flags) && !FlagOn(LogUpdMask, flags)) {
|
|
Flags((CELL)pt0) = ResetFlag(InUseMask, flags);
|
|
if (FlagOn(ErasedMask, flags)) {
|
|
ErDBE((DBRef) ((CELL)pt0 - (CELL) &(((DBRef) NIL)->Flags)));
|
|
}
|
|
RESET_VARIABLE(trail_ptr);
|
|
discard_trail_entries++;
|
|
}
|
|
} else {
|
|
Flags((CELL)pt0) = ResetFlag(GcFoundMask, flags);
|
|
}
|
|
#if MULTI_ASSIGNMENT_VARIABLES
|
|
} else {
|
|
CELL *old_value_ptr = (CELL *)trail_ptr;
|
|
|
|
if (MARKED(trail_cell)) {
|
|
UNMARK(&TrailTerm(trail_ptr));
|
|
if (HEAP_PTR(TrailTerm(trail_ptr))) {
|
|
into_relocation_chain(&TrailTerm(trail_ptr), GET_NEXT(trail_cell));
|
|
}
|
|
}
|
|
trail_cell = old_value_ptr[-1];
|
|
#ifdef FROZEN_REGS
|
|
if (MARKED(TrailVal(trail_ptr))) {
|
|
UNMARK(&TrailVal(trail_ptr));
|
|
if (HEAP_PTR(TrailVal(trail_ptr))) {
|
|
into_relocation_chain(&TrailVal(trail_ptr), GET_NEXT(TrailTerm(trail_ptr)));
|
|
}
|
|
}
|
|
#endif
|
|
old_value_ptr--;
|
|
if (MARKED(trail_cell)) {
|
|
UNMARK(old_value_ptr);
|
|
if (HEAP_PTR(trail_cell)) {
|
|
into_relocation_chain(old_value_ptr, GET_NEXT(trail_cell));
|
|
}
|
|
}
|
|
trail_ptr = (tr_fr_ptr)old_value_ptr;
|
|
#endif
|
|
}
|
|
}
|
|
if (is_gc_verbose()) {
|
|
YP_fprintf(YP_stderr,
|
|
"[GC] Trail: discarded %d (%ld%%) cells out of %ld\n",
|
|
discard_trail_entries,
|
|
(unsigned long int)(discard_trail_entries*100/(old_TR-(tr_fr_ptr)TrailBase)),
|
|
(unsigned long int)(old_TR-(tr_fr_ptr)TrailBase));
|
|
#ifdef DEBUG
|
|
if (hp_entrs > 0)
|
|
YP_fprintf(YP_stderr,
|
|
"[GC] Trail: unmarked %ld dbentries (%ld%%) out of %ld\n",
|
|
(long int)hp_not_in_use,
|
|
(long int)(hp_not_in_use*100/hp_entrs),
|
|
(long int)hp_entrs);
|
|
if (hp_in_use_erased > 0 && hp_erased > 0)
|
|
YP_fprintf(YP_stderr,
|
|
"[GC] Trail: deleted %ld dbentries (%ld%%) out of %ld\n",
|
|
(long int)hp_erased,
|
|
(long int)(hp_erased*100/(hp_erased+hp_in_use_erased)),
|
|
(long int)(hp_erased+hp_in_use_erased));
|
|
#endif
|
|
YP_fprintf(YP_stderr,
|
|
"[GC] Heap: recovered %ld bytes (%ld%%) out of %ld\n",
|
|
(unsigned long int)(OldHeapUsed-HeapUsed),
|
|
(unsigned long int)((OldHeapUsed-HeapUsed)/(OldHeapUsed/100)),
|
|
(unsigned long int)OldHeapUsed);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* insert cells of a chain of environments which point to heap objects into
|
|
* relocation chains
|
|
*/
|
|
|
|
static void
|
|
sweep_environments(CELL_PTR gc_ENV, OPREG size, CELL *pvbmap)
|
|
{
|
|
CELL_PTR saved_var;
|
|
|
|
while (gc_ENV != NULL) { /* no more environments */
|
|
Int bmap = 0;
|
|
int currv = 0;
|
|
|
|
|
|
/* for each saved variable */
|
|
|
|
if (size > EnvSizeInCells) {
|
|
int tsize = size - EnvSizeInCells;
|
|
|
|
currv = sizeof(CELL)*8-tsize%(sizeof(CELL)*8);
|
|
pvbmap += tsize/(sizeof(CELL)*8);
|
|
bmap = *pvbmap;
|
|
bmap = (Int)(((CELL)bmap) << currv);
|
|
}
|
|
for (saved_var = gc_ENV - size; saved_var < gc_ENV - EnvSizeInCells; saved_var++) {
|
|
|
|
if (currv == sizeof(CELL)*8) {
|
|
pvbmap--;
|
|
bmap = *pvbmap;
|
|
currv = 0;
|
|
}
|
|
if (bmap < 0) {
|
|
CELL env_cell = *saved_var;
|
|
if (MARKED(env_cell)) {
|
|
UNMARK(saved_var);
|
|
if (HEAP_PTR(env_cell)) {
|
|
into_relocation_chain(saved_var, GET_NEXT(env_cell));
|
|
}
|
|
}
|
|
}
|
|
bmap <<= 1;
|
|
currv++;
|
|
}
|
|
/* have we met this environment before?? */
|
|
/* we use the B field in the environment to tell whether we have
|
|
been here before or not
|
|
*/
|
|
if (!MARKED(gc_ENV[E_CB]))
|
|
return;
|
|
UNMARK(gc_ENV+E_CB);
|
|
|
|
size = EnvSize((CELL_PTR) (gc_ENV[E_CP])); /* size = EnvSize(CP) */
|
|
pvbmap = EnvBMap((CELL_PTR) (gc_ENV[E_CP]));
|
|
gc_ENV = (CELL_PTR) gc_ENV[E_E]; /* link to prev
|
|
* environment */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* insert cells of each choicepoint & its chain of environments which point
|
|
* to heap objects into relocation chains
|
|
*/
|
|
static void
|
|
sweep_choicepoints(choiceptr gc_B)
|
|
{
|
|
|
|
while(gc_B != NULL) {
|
|
yamop *rtp = gc_B->cp_ap;
|
|
register OPCODE op;
|
|
op_numbers opnum;
|
|
|
|
#ifdef TABLING
|
|
/* ignore empty choicepoints */
|
|
if (rtp == NULL) {
|
|
gc_B = gc_B->cp_b;
|
|
continue;
|
|
}
|
|
#endif
|
|
op = rtp->opc;
|
|
opnum = op_from_opcode(op);
|
|
|
|
restart_cp:
|
|
/*
|
|
* YP_fprintf(YP_stderr,"sweeping cps: %x, %x, %x\n",
|
|
* *gc_B,CP_Extra(gc_B),CP_Nargs(gc_B));
|
|
*/
|
|
/* any choice point */
|
|
switch (opnum) {
|
|
case _Nstop:
|
|
/* end of the road, say bye bye! */
|
|
sweep_environments(gc_B->cp_env,
|
|
EnvSizeInCells,
|
|
NULL);
|
|
if (gc_B->cp_b != NULL) {
|
|
register CELL_PTR saved_reg;
|
|
|
|
/* for each saved register */
|
|
for (saved_reg = &gc_B->cp_a1;
|
|
saved_reg < &gc_B->cp_a1 + IntOfTerm(gc_B->cp_a1);
|
|
saved_reg++) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
} else
|
|
return;
|
|
case _or_else:
|
|
case _or_last:
|
|
|
|
sweep_environments((CELL_PTR)(gc_B->cp_a1),
|
|
#ifdef YAPOR
|
|
-gc_B->cp_cp->u.ldl.s / ((OPREG)sizeof(CELL)),
|
|
EnvBMapOffset((CELL *)(gc_B->cp_cp->u.ldl.bl))
|
|
#else
|
|
-gc_B->cp_cp->u.sla.s / ((OPREG)sizeof(CELL)),
|
|
EnvBMapOffset((CELL *)(gc_B->cp_cp->u.sla.l2))
|
|
#endif
|
|
);
|
|
break;
|
|
case _trust_logical_pred:
|
|
case _retry_profiled:
|
|
rtp = NEXTOP(rtp,l);
|
|
op = rtp->opc;
|
|
opnum = op_from_opcode(op);
|
|
goto restart_cp;
|
|
#ifdef TABLING
|
|
case _table_answer_resolution:
|
|
{
|
|
CELL *answ_fr;
|
|
CELL vars;
|
|
|
|
sweep_environments(gc_B->cp_env,
|
|
EnvSize((CELL_PTR) (gc_B->cp_cp)),
|
|
EnvBMap((CELL_PTR) (gc_B->cp_cp)));
|
|
|
|
/* fetch the solution */
|
|
init_substitution_pointer(gc_B, answ_fr, CONS_CP(gc_B)->ccp_dep_fr);
|
|
vars = *answ_fr++;
|
|
while (vars--) {
|
|
CELL cp_cell = *answ_fr;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(answ_fr);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(answ_fr, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case _table_completion:
|
|
{
|
|
register gen_cp_ptr gcp = GEN_CP(gc_B);
|
|
|
|
#ifdef TABLING_BATCHED_SCHEDULING
|
|
int nargs = gcp->gcp_sg_fr->subgoal_arity;
|
|
#else
|
|
int nargs = gcp->gcp_dep_fr->subgoal_frame->subgoal_arity;
|
|
#endif
|
|
CELL *saved_reg;
|
|
|
|
saved_reg = (CELL *)(gcp+1)+nargs;
|
|
nargs = *saved_reg++;
|
|
while (nargs--) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
saved_reg++;
|
|
}
|
|
}
|
|
break;
|
|
case _table_retry_me:
|
|
case _table_trust_me:
|
|
{
|
|
register gen_cp_ptr gcp = GEN_CP(gc_B);
|
|
int nargs;
|
|
CELL *saved_reg;
|
|
|
|
sweep_environments(gc_B->cp_env,
|
|
EnvSize((CELL_PTR) (gc_B->cp_cp)),
|
|
EnvBMap((CELL_PTR) (gc_B->cp_cp)));
|
|
|
|
nargs = rtp->u.ld.s;
|
|
/* for each saved register */
|
|
for (saved_reg = (CELL *)(gcp+1);
|
|
/* assumes we can count registers in CP this
|
|
way */
|
|
saved_reg < (CELL *)(gcp+1) + nargs;
|
|
saved_reg++) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
}
|
|
saved_reg = (CELL *)(gcp+1) + nargs;
|
|
nargs = *saved_reg++;
|
|
while (nargs--) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
saved_reg++;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
case _retry_c:
|
|
case _retry_userc:
|
|
{
|
|
register CELL_PTR saved_reg;
|
|
|
|
/* for each extra saved register */
|
|
for (saved_reg = &(gc_B->cp_a1)+rtp->u.lds.s;
|
|
saved_reg < &(gc_B->cp_a1)+rtp->u.lds.s+rtp->u.lds.extra;
|
|
saved_reg++) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* continue to clean environments and arguments */
|
|
default:
|
|
{
|
|
register CELL_PTR saved_reg;
|
|
|
|
sweep_environments(gc_B->cp_env,
|
|
EnvSize((CELL_PTR) (gc_B->cp_cp)),
|
|
EnvBMap((CELL_PTR) (gc_B->cp_cp)));
|
|
|
|
/* for each saved register */
|
|
for (saved_reg = &gc_B->cp_a1;
|
|
saved_reg < &gc_B->cp_a1 + rtp->u.ld.s;
|
|
saved_reg++) {
|
|
CELL cp_cell = *saved_reg;
|
|
if (MARKED(cp_cell)) {
|
|
UNMARK(saved_reg);
|
|
if (HEAP_PTR(cp_cell)) {
|
|
into_relocation_chain(saved_reg, GET_NEXT(cp_cell));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* link to prev choicepoint */
|
|
gc_B = gc_B->cp_b;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
/* update a relocation chain to point all its cells to new location of object */
|
|
static void
|
|
update_relocation_chain(CELL_PTR current, CELL_PTR dest)
|
|
{
|
|
CELL_PTR next;
|
|
CELL ccur = *current;
|
|
|
|
#ifdef TAGS_FAST_OPS
|
|
while (RMARKED(ccur)) {
|
|
register CELL cnext;
|
|
|
|
next = GET_NEXT(ccur);
|
|
cnext = *next;
|
|
|
|
if (IsVarTerm(ccur)) {
|
|
ccur = *current = (MARKED_VAR(ccur) ?
|
|
ENSURE_MARKED(cnext) :
|
|
UNMARKED(cnext) );
|
|
*next = (MARKED(cnext) ? MBIT : 0) | (Int) dest;
|
|
} else if (IsPairTerm(ccur)) {
|
|
ccur = *current = (MARKED_COMP(ccur) ?
|
|
ENSURE_MARKED(cnext) :
|
|
UNMARKED(cnext) );
|
|
*next = AbsPair((CELL *)
|
|
((MARKED(cnext) ? MBIT : 0) |
|
|
(Int) dest));
|
|
} else if (IsApplTerm(ccur)) {
|
|
ccur = *current = (MARKED_COMP(ccur) ?
|
|
ENSURE_MARKED(cnext) :
|
|
UNMARKED(cnext) );
|
|
*next = AbsAppl((CELL *)
|
|
((MARKED(cnext) ? MBIT : 0) |
|
|
(Int) dest));
|
|
}
|
|
#ifdef DEBUG
|
|
else {
|
|
Abort("[GC] ATOMIC in relocation chain");
|
|
}
|
|
#endif
|
|
}
|
|
#else /* TAGS_FAST_OPS */
|
|
while (RMARKED(ccur)) {
|
|
CELL current_tag;
|
|
next = GET_NEXT(ccur);
|
|
current_tag = TAG(ccur);
|
|
ccur = *current = (ccur & MBIT) | (*next & ~MBIT);
|
|
#if INVERT_RBIT
|
|
*next = (*next & MBIT) | (CELL) dest | current_tag | RBIT;
|
|
#else
|
|
*next = (*next & MBIT) | (CELL) dest | current_tag;
|
|
#endif
|
|
}
|
|
#endif /* TAGS_FAST_OPS */
|
|
}
|
|
|
|
static inline choiceptr
|
|
update_B_H( choiceptr gc_B, CELL *current, CELL *dest, CELL *odest) {
|
|
/* also make the value of H in a choicepoint
|
|
coherent with the new global
|
|
*/
|
|
while (gc_B && current <= gc_B->cp_h) {
|
|
if (gc_B->cp_h == current) {
|
|
gc_B->cp_h = dest;
|
|
} else {
|
|
gc_B->cp_h = odest;
|
|
}
|
|
gc_B = gc_B->cp_b;
|
|
}
|
|
return(gc_B);
|
|
}
|
|
|
|
/*
|
|
* move marked objects on the heap upwards over unmarked objects, and reset
|
|
* all pointers to point to new locations
|
|
*/
|
|
static void
|
|
compact_heap(void)
|
|
{
|
|
CELL_PTR dest, current, next;
|
|
#ifdef DEBUG
|
|
Int found_marked = 0;
|
|
#endif /* DEBUG */
|
|
choiceptr gc_B = B;
|
|
int in_garbage = 0;
|
|
|
|
|
|
/*
|
|
* upward phase - scan heap from high to low, setting marked upward
|
|
* ptrs to point to what will be the new locations of the
|
|
* objects pointed to
|
|
*/
|
|
|
|
dest = (CELL_PTR) H0 + total_marked - 1;
|
|
for (current = H - 1; current >= H0; current--) {
|
|
if (MARKED(*current)) {
|
|
CELL ccell = UNMARK_CELL(*current);
|
|
if (ccell < (CELL)AtomBase && ccell > EndSpecials && IsVarTerm(ccell)
|
|
) {
|
|
/* oops, we found a blob */
|
|
int nofcells = (UNMARK_CELL(*current)-EndSpecials) / sizeof(CELL);
|
|
CELL *ptr = current - nofcells ;
|
|
CELL func = ptr[0];
|
|
|
|
if (MARKED(func)) {
|
|
#ifdef DEBUG
|
|
found_marked+=nofcells;
|
|
#endif /* DEBUG */
|
|
gc_B = update_B_H(gc_B, current, dest, dest+1);
|
|
/* this one's being used */
|
|
/* first swap the tag so that it will be seen by the next step */
|
|
{
|
|
CELL tmp = current[0];
|
|
current[0] = ptr[1];
|
|
ptr[1] = tmp;
|
|
}
|
|
if (in_garbage > 0) {
|
|
current[1] = in_garbage;
|
|
in_garbage = 0;
|
|
}
|
|
dest -= nofcells;
|
|
current = ptr;
|
|
/* process the functor next */
|
|
} else {
|
|
/* skip the term */
|
|
in_garbage += nofcells+1;
|
|
current = ptr;
|
|
continue;
|
|
}
|
|
} else{
|
|
gc_B = update_B_H(gc_B, current, dest, dest+1);
|
|
}
|
|
if (in_garbage > 0) {
|
|
current[1] = in_garbage;
|
|
in_garbage = 0;
|
|
}
|
|
#ifdef DEBUG
|
|
found_marked++;
|
|
#endif /* DEBUG */
|
|
update_relocation_chain(current, dest);
|
|
if (HEAP_PTR(*current)) {
|
|
next = GET_NEXT(*current);
|
|
if (next < current) /* push into reloc.
|
|
* chain */
|
|
into_relocation_chain(current, next);
|
|
else if (current == next) /* cell pointing to
|
|
* itself */
|
|
*current = (*current & MBIT) | (CELL) dest; /* no tag */
|
|
}
|
|
dest--;
|
|
} else {
|
|
in_garbage++;
|
|
}
|
|
}
|
|
if (in_garbage)
|
|
H0[0] = in_garbage;
|
|
|
|
#ifdef DEBUG
|
|
if (total_marked != found_marked)
|
|
YP_fprintf(YP_stderr,"[GC] Upward (%d): %ld total against %ld found\n",
|
|
gc_calls,
|
|
(unsigned long int)total_marked,
|
|
(unsigned long int)found_marked);
|
|
found_marked = 0;
|
|
#endif
|
|
|
|
|
|
/*
|
|
* downward phase - scan heap from low to high, moving marked objects
|
|
* to their new locations & setting downward pointers to pt to new
|
|
* locations
|
|
*/
|
|
|
|
dest = (CELL_PTR) H0;
|
|
for (current = H0; current < H; current++) {
|
|
CELL ccur = *current;
|
|
if (MARKED(ccur)) {
|
|
CELL uccur = UNMARK_CELL(ccur);
|
|
if (uccur < (CELL)AtomBase && uccur > EndSpecials && IsVarTerm(uccur)) {
|
|
/* oops, we found a blob */
|
|
int nofcells = (uccur-EndSpecials) / sizeof(CELL) , i;
|
|
|
|
*dest++ = current[nofcells-1];
|
|
current ++;
|
|
for (i = 0; i < nofcells-2; i++) {
|
|
*dest++ = *current++;
|
|
}
|
|
*dest++ = ccur;
|
|
#ifdef DEBUG
|
|
found_marked += nofcells;
|
|
#endif
|
|
continue;
|
|
}
|
|
#ifdef DEBUG
|
|
found_marked++;
|
|
#endif
|
|
update_relocation_chain(current, dest);
|
|
ccur = *current;
|
|
next = GET_NEXT(ccur);
|
|
if (HEAP_PTR(ccur) && /* move current cell &
|
|
* push */
|
|
next > current) { /* into relocation chain */
|
|
*dest = ccur;
|
|
into_relocation_chain(dest, next);
|
|
UNMARK(dest);
|
|
} else {
|
|
/* just move current cell */
|
|
*dest = ccur = UNMARK_CELL(ccur);
|
|
}
|
|
/* next cell, please */
|
|
dest++;
|
|
} else {
|
|
current += (ccur-1);
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
if (total_marked != found_marked)
|
|
YP_fprintf(YP_stderr,"[GC] Downward (%d): %ld total against %ld found\n",
|
|
gc_calls,
|
|
(unsigned long int)total_marked,
|
|
(unsigned long int)found_marked);
|
|
#endif
|
|
|
|
H = dest; /* reset H */
|
|
HB = B->cp_h;
|
|
#ifdef TABLING
|
|
if (B_FZ == (choiceptr)LCL0)
|
|
H_FZ = H0;
|
|
else
|
|
H_FZ = B_FZ->cp_h;
|
|
#endif
|
|
|
|
}
|
|
|
|
#ifdef HYBRID_SCHEME
|
|
/*
|
|
* move marked objects on the heap upwards over unmarked objects, and reset
|
|
* all pointers to point to new locations
|
|
*/
|
|
static void
|
|
icompact_heap(void)
|
|
{
|
|
CELL_PTR *iptr, *ibase = (CELL_PTR *)H;
|
|
#ifdef DEBUG
|
|
Int found_marked = 0;
|
|
#endif /* DEBUG */
|
|
choiceptr gc_B = B;
|
|
|
|
|
|
/*
|
|
* upward phase - scan heap from high to low, setting marked upward
|
|
* ptrs to point to what will be the new locations of the
|
|
* objects pointed to
|
|
*/
|
|
|
|
for (iptr = iptop - 1; iptr >= ibase; iptr--) {
|
|
CELL ccell;
|
|
CELL_PTR current;
|
|
|
|
current = *iptr;
|
|
ccell = UNMARK_CELL(*current);
|
|
if (ccell < (CELL)AtomBase && ccell > EndSpecials && IsVarTerm(ccell)
|
|
) {
|
|
/* oops, we found a blob */
|
|
int nofcells = (UNMARK_CELL(*current)-EndSpecials) / sizeof(CELL);
|
|
CELL *ptr = current - nofcells ;
|
|
|
|
gc_B = update_B_H(gc_B, current, H0+(iptr-ibase), H0+(iptr-ibase)+1);
|
|
iptr -= nofcells;
|
|
#ifdef DEBUG
|
|
found_marked+=nofcells;
|
|
#endif /* DEBUG */
|
|
/* this one's being used */
|
|
/* first swap the tag so that it will be seen by the next step */
|
|
{
|
|
CELL tmp = current[0];
|
|
current[0] = ptr[1];
|
|
ptr[1] = tmp;
|
|
}
|
|
current = ptr;
|
|
} else {
|
|
/* process the functor next */
|
|
gc_B = update_B_H(gc_B, current, H0+(iptr-ibase), H0+((iptr-ibase)+1));
|
|
}
|
|
#ifdef DEBUG
|
|
found_marked++;
|
|
#endif /* DEBUG */
|
|
update_relocation_chain(current, H0+(iptr-ibase));
|
|
if (HEAP_PTR(*current)) {
|
|
CELL_PTR next;
|
|
next = GET_NEXT(*current);
|
|
if (next < current) /* push into reloc.
|
|
* chain */
|
|
into_relocation_chain(current, next);
|
|
else if (current == next) /* cell pointing to
|
|
* itself */
|
|
*current = (*current & MBIT) | (CELL) (H0+(iptr-ibase)); /* no tag */
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (total_marked != found_marked)
|
|
YP_fprintf(YP_stderr,"[GC] Upward (%d): %ld total against %ld found\n",
|
|
gc_calls,
|
|
(unsigned long int)total_marked,
|
|
(unsigned long int)found_marked);
|
|
found_marked = 0;
|
|
#endif
|
|
|
|
|
|
/*
|
|
* downward phase - scan heap from low to high, moving marked objects
|
|
* to their new locations & setting downward pointers to pt to new
|
|
* locations
|
|
*/
|
|
|
|
for (iptr = ibase; iptr < iptop; iptr++) {
|
|
CELL_PTR next;
|
|
CELL *current = *iptr;
|
|
CELL ccur = *current;
|
|
CELL_PTR dest = H0+(iptr-ibase);
|
|
CELL uccur = UNMARK_CELL(ccur);
|
|
if (uccur < (CELL)AtomBase && uccur > EndSpecials && IsVarTerm(uccur)) {
|
|
/* oops, we found a blob */
|
|
int nofcells = (uccur-EndSpecials) / sizeof(CELL) , i;
|
|
|
|
*dest++ = current[nofcells-1];
|
|
current ++;
|
|
for (i = 0; i < nofcells-2; i++) {
|
|
*dest++ = *current++;
|
|
}
|
|
*dest = ccur;
|
|
iptr += nofcells-1;
|
|
#ifdef DEBUG
|
|
found_marked += nofcells;
|
|
#endif
|
|
continue;
|
|
}
|
|
#ifdef DEBUG
|
|
found_marked++;
|
|
#endif
|
|
update_relocation_chain(current, dest);
|
|
ccur = *current;
|
|
next = GET_NEXT(ccur);
|
|
if (HEAP_PTR(ccur) && /* move current cell &
|
|
* push */
|
|
next > current) { /* into relocation chain */
|
|
*dest = ccur;
|
|
into_relocation_chain(dest, next);
|
|
UNMARK(dest);
|
|
} else {
|
|
/* just move current cell */
|
|
*dest = ccur = UNMARK_CELL(ccur);
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
if (total_marked != found_marked)
|
|
YP_fprintf(YP_stderr,"[GC] Downward (%d): %ld total against %ld found\n",
|
|
gc_calls,
|
|
(unsigned long int)total_marked,
|
|
(unsigned long int)found_marked);
|
|
#endif
|
|
|
|
H = H0+(iptop-ibase); /* reset H */
|
|
HB = B->cp_h;
|
|
#ifdef TABLING
|
|
if (B_FZ == (choiceptr)LCL0)
|
|
H_FZ = H0;
|
|
else
|
|
H_FZ = B_FZ->cp_h;
|
|
#endif
|
|
|
|
}
|
|
#endif /* HYBRID_SCHEME */
|
|
|
|
|
|
#ifdef EASY_SHUNTING
|
|
static void
|
|
set_conditionals(CELL *TRo) {
|
|
while (sTR != TRo) {
|
|
CELL *cptr = (CELL *)TrailTerm(sTR-1);
|
|
*cptr = TrailTerm(sTR-2);
|
|
sTR -= 2;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* mark all objects on the heap that are accessible from active registers,
|
|
* the trail, environments, and choicepoints
|
|
*/
|
|
|
|
static void
|
|
marking_phase(tr_fr_ptr old_TR, CELL *current_env, yamop *curp, CELL *max)
|
|
{
|
|
|
|
#ifdef EASY_SHUNTING
|
|
tr_fr_ptr TRo;
|
|
sTR = (tr_fr_ptr)PreAllocCodeSpace();
|
|
TRo = sTR;
|
|
current_B = B;
|
|
#endif
|
|
init_dbtable(old_TR);
|
|
/* These two must be marked first so that our trail optimisation won't lose
|
|
values */
|
|
mark_regs(old_TR); /* active registers & trail */
|
|
#ifdef COROUTINING
|
|
mark_delays(max);
|
|
#endif
|
|
/* active environments */
|
|
mark_environments(current_env, EnvSize(curp), EnvBMap((CELL *)curp));
|
|
mark_choicepoints(B, old_TR); /* choicepoints, and environs */
|
|
#ifdef EASY_SHUNTING
|
|
set_conditionals(TRo);
|
|
ReleasePreAllocCodeSpace((ADDR)sTR);
|
|
#endif
|
|
}
|
|
|
|
#ifdef COROUTINING
|
|
static void
|
|
sweep_delays(CELL *max)
|
|
{
|
|
CELL *ptr = (CELL *)GlobalBase;
|
|
while (ptr < max) {
|
|
if (MARKED(*ptr)) {
|
|
UNMARK(ptr);
|
|
if (HEAP_PTR(*ptr)) {
|
|
into_relocation_chain(ptr, GET_NEXT(*ptr));
|
|
}
|
|
}
|
|
ptr++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* move marked heap objects upwards over unmarked objects, and reset all
|
|
* pointers to point to new locations
|
|
*/
|
|
|
|
static void
|
|
compaction_phase(tr_fr_ptr old_TR, CELL *current_env, yamop *curp, CELL *max)
|
|
{
|
|
#ifdef COROUTINING
|
|
sweep_delays(max);
|
|
#endif
|
|
sweep_environments(current_env, EnvSize(curp), EnvBMap((CELL *)curp));
|
|
sweep_choicepoints(B);
|
|
sweep_trail(B, old_TR);
|
|
#ifdef HYBRID_SCHEME
|
|
#ifdef DEBUG
|
|
if (total_marked != iptop-(CELL_PTR *)H && iptop < (CELL_PTR *)ASP -1024)
|
|
YP_fprintf(YP_stderr,"[GC] Oops on iptop-H (%d) vs %d\n", iptop-(CELL_PTR *)H, total_marked);
|
|
#endif
|
|
if (iptop < (CELL_PTR *)ASP-1024 && 10*total_marked < H-H0) {
|
|
#ifdef DEBUG_IN
|
|
int effectiveness = (((H-H0)-total_marked)*100)/(H-H0);
|
|
fprintf(stderr,"using pointers (%d)\n", effectiveness);
|
|
#endif
|
|
quicksort((CELL_PTR *)H, 0, (iptop-(CELL_PTR *)H)-1);
|
|
icompact_heap();
|
|
} else
|
|
#endif /* HYBRID_SCHEME */
|
|
{
|
|
#ifdef DEBUG_IN
|
|
int effectiveness = (((H-H0)-total_marked)*100)/(H-H0);
|
|
fprintf(stderr,"not using pointers (%d)\n", effectiveness);
|
|
#endif
|
|
compact_heap();
|
|
}
|
|
}
|
|
|
|
static Int
|
|
do_gc(Int predarity, CELL *current_env, yamop *nextop)
|
|
{
|
|
Int heap_cells = H-H0;
|
|
int gc_verbose = is_gc_verbose();
|
|
tr_fr_ptr old_TR;
|
|
Int m_time, c_time, time_start, gc_time;
|
|
#ifdef COROUTINING
|
|
CELL *max = (CELL *)ReadTimedVar(DelayedVars);
|
|
#else
|
|
CELL *max = NULL;
|
|
#endif
|
|
Int effectiveness = 0;
|
|
int gc_trace = FALSE;
|
|
|
|
#ifdef HYBRID_SCHEME
|
|
iptop = (CELL_PTR *)H;
|
|
#endif
|
|
#ifdef INSTRUMENT_GC
|
|
{
|
|
int i;
|
|
for (i=0; i<16; i++)
|
|
chain[i]=0;
|
|
vars[gc_var] = 0;
|
|
vars[gc_ref] = 0;
|
|
vars[gc_atom] = 0;
|
|
vars[gc_int] = 0;
|
|
vars[gc_num] = 0;
|
|
vars[gc_list] = 0;
|
|
vars[gc_appl] = 0;
|
|
vars[gc_func] = 0;
|
|
vars[gc_susp] = 0;
|
|
env_vars = 0;
|
|
old_vars = new_vars = 0;
|
|
TrueHB = HB;
|
|
num_bs = 0;
|
|
}
|
|
#endif
|
|
#ifdef DEBUG
|
|
check_global();
|
|
#endif
|
|
if (GetValue(AtomGcTrace) != TermNil)
|
|
gc_trace = 1;
|
|
gc_calls++;
|
|
if (gc_trace) {
|
|
YP_fprintf(YP_stderr, "[gc]\n");
|
|
} else if (gc_verbose) {
|
|
YP_fprintf(YP_stderr, "[GC] Start of garbage collection %d:\n", gc_calls);
|
|
#ifndef EARLY_RESET
|
|
YP_fprintf(YP_stderr, "[GC] no early reset in trail\n");
|
|
#endif
|
|
YP_fprintf(YP_stderr, "[GC] Global: %8ld cells (%p-%p)\n", (long int)heap_cells,H0,H);
|
|
YP_fprintf(YP_stderr, "[GC] Local:%8ld cells (%p-%p)\n", (unsigned long int)(LCL0-ASP),LCL0,ASP);
|
|
YP_fprintf(YP_stderr, "[GC] Trail:%8ld cells (%p-%p)\n",
|
|
(unsigned long int)(TR-(tr_fr_ptr)TrailBase),TrailBase,TR);
|
|
}
|
|
time_start = cputime();
|
|
total_marked = 0;
|
|
discard_trail_entries = 0;
|
|
/* get the number of active registers */
|
|
YAPEnterCriticalSection();
|
|
old_TR = TR;
|
|
push_registers(predarity, nextop);
|
|
marking_phase(old_TR, current_env, nextop, max);
|
|
m_time = cputime();
|
|
gc_time = m_time-time_start;
|
|
if (heap_cells)
|
|
effectiveness = ((heap_cells-total_marked)*100)/heap_cells;
|
|
else
|
|
effectiveness = 0;
|
|
if (gc_verbose) {
|
|
YP_fprintf(YP_stderr, "[GC] Mark: Recovered %ld cells of %ld (%ld%%) in %g sec\n",
|
|
(long int)(heap_cells-total_marked), (long int)heap_cells, (long int)effectiveness, (double)(m_time-time_start)/1000);
|
|
#ifdef INSTRUMENT_GC
|
|
{
|
|
int i;
|
|
for (i=0; i<16; i++) {
|
|
if (chain[i]) {
|
|
YP_fprintf(YP_stderr, "[GC] chain[%d]=%lu\n", i, chain[i]);
|
|
}
|
|
}
|
|
put_type_info((unsigned long int)total_marked);
|
|
YP_fprintf(YP_stderr,"[GC] %lu/%ld before and %lu/%ld after\n", old_vars, (unsigned long int)(B->cp_h-H0), new_vars, (unsigned long int)(H-B->cp_h));
|
|
YP_fprintf(YP_stderr,"[GC] %ld choicepoints\n", num_bs);
|
|
}
|
|
#endif
|
|
}
|
|
time_start = m_time;
|
|
compaction_phase(old_TR, current_env, nextop, max);
|
|
TR = old_TR;
|
|
pop_registers(predarity, nextop);
|
|
c_time = cputime();
|
|
YAPLeaveCriticalSection();
|
|
if (gc_verbose) {
|
|
YP_fprintf(YP_stderr, "[GC] Compress: took %g sec\n", (double)(c_time-time_start)/1000);
|
|
}
|
|
gc_time += (c_time-time_start);
|
|
tot_gc_time += gc_time;
|
|
tot_gc_recovered += (H-H0)-total_marked;
|
|
if (gc_verbose) {
|
|
YP_fprintf(YP_stderr, "[GC] GC %d took %g sec, total of %g sec doing GC so far.\n", gc_calls, (double)gc_time/1000, (double)tot_gc_time/1000);
|
|
YP_fprintf(YP_stderr, "[GC] Left %ld cells free in stacks.\n",
|
|
(unsigned long int)(ASP-H));
|
|
}
|
|
#ifdef DEBUG
|
|
check_global();
|
|
#endif
|
|
return(effectiveness);
|
|
}
|
|
|
|
#endif /* FIXED_STACKS */
|
|
|
|
int
|
|
is_gc_verbose(void)
|
|
{
|
|
return(GetValue(AtomGcVerbose) != TermNil);
|
|
}
|
|
|
|
Int total_gc_time(void)
|
|
{
|
|
return(tot_gc_time);
|
|
}
|
|
|
|
static Int
|
|
p_inform_gc(void)
|
|
{
|
|
Term tn = MkIntegerTerm(tot_gc_time);
|
|
Term tt = MkIntTerm(gc_calls);
|
|
Term ts = MkIntTerm((total_marked*sizeof(CELL)));
|
|
|
|
return(unify(tn, ARG2) && unify(tt, ARG1) && unify(ts, ARG3));
|
|
|
|
}
|
|
|
|
|
|
int
|
|
gc(Int predarity, CELL *current_env, yamop *nextop)
|
|
{
|
|
#ifdef FIXED_STACKS
|
|
abort_optyap("garbage collection");
|
|
#else /* FIXED_STACKS */
|
|
Int gc_margin = 128;
|
|
Term Tgc_margin;
|
|
Int effectiveness = 0;
|
|
int gc_on = FALSE;
|
|
|
|
if (GetValue(AtomGc) != TermNil)
|
|
gc_on = TRUE;
|
|
if (IsIntTerm(Tgc_margin = GetValue(AtomGcMargin)))
|
|
gc_margin = IntOfTerm(Tgc_margin);
|
|
else {
|
|
if (gc_calls < 8)
|
|
gc_margin <<= gc_calls;
|
|
else
|
|
gc_margin <<= 8;
|
|
}
|
|
if (gc_margin < 0 || gc_margin > 4000)
|
|
gc_margin = (LCL0 - H0) >> 9;
|
|
gc_margin = gc_margin << 8;
|
|
if (gc_on)
|
|
effectiveness = do_gc(predarity, current_env, nextop);
|
|
if (effectiveness > 90) {
|
|
while (gc_margin < H-H0)
|
|
gc_margin <<= 1;
|
|
}
|
|
/* expand the stak if effectiveness is less than 20 % */
|
|
if (ASP - H < gc_margin || !gc_on || effectiveness < 20) {
|
|
if (ASP-H > gc_margin)
|
|
gc_margin = (ASP-H)+MinStackGap*(stack_overflows+1);
|
|
else
|
|
gc_margin = 8 * (gc_margin - (ASP - H));
|
|
gc_margin = ((gc_margin >> 16) + 1) << 16;
|
|
if (gc_margin < MinStackGap)
|
|
gc_margin = MinStackGap;
|
|
while (gc_margin >= MinStackGap && !growstack(gc_margin))
|
|
gc_margin = gc_margin/2;
|
|
#ifdef DEBUG
|
|
check_global();
|
|
#endif
|
|
return(gc_margin >= MinStackGap);
|
|
}
|
|
/*
|
|
* debug for(save_total=1; save_total<=N; ++save_total)
|
|
* plwrite(XREGS[save_total],DebugPutc,0);
|
|
*/
|
|
#endif /* FIXED_STACKS */
|
|
return ( TRUE );
|
|
}
|
|
|
|
|
|
static Int
|
|
p_gc(void)
|
|
{
|
|
#ifndef FIXED_STACKS
|
|
do_gc(0, ENV, CP);
|
|
#endif /* FIXED_STACKS */
|
|
return(TRUE);
|
|
}
|
|
|
|
void
|
|
init_gc(void)
|
|
{
|
|
InitCPred("$gc", 0, p_gc, 0);
|
|
InitCPred("$inform_gc", 3, p_inform_gc, 0);
|
|
}
|