93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/************************************************************************
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** **
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** The YapTab/YapOr/OPTYap systems **
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** **
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** YapTab extends the Yap Prolog engine to support sequential tabling **
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** YapOr extends the Yap Prolog engine to support or-parallelism **
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** OPTYap extends the Yap Prolog engine to support or-parallel tabling **
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** **
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** **
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** Yap Prolog was developed at University of Porto, Portugal **
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** **
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************************************************************************/
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#ifdef MULTI_ASSIGNMENT_VARIABLES
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/*
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Set of routines to allow restoring updatable variables when we go *up*
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in the tree. Required by copying, SBA, and tabling. Not required by ACOW.
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*/
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#ifndef OPT_MAVAR_STATIC
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#define OPT_MAVAR_STATIC inline static
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#endif /* !OPT_MAVAR_STATIC */
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OPT_MAVAR_STATIC unsigned int Yap_MAVAR_HASH(CELL *addr USES_REGS);
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OPT_MAVAR_STATIC struct ma_h_entry * Yap_ALLOC_NEW_MASPACE(USES_REGS1);
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OPT_MAVAR_STATIC int Yap_lookup_ma_var(CELL *addr USES_REGS);
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OPT_MAVAR_STATIC UInt Yap_NEW_MAHASH(ma_h_inner_struct *top USES_REGS);
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OPT_MAVAR_STATIC unsigned int
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Yap_MAVAR_HASH(CELL *addr USES_REGS) {
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#if SIZEOF_INT_P==8
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return((((unsigned int)((CELL)(addr)))>>3)%MAVARS_HASH_SIZE);
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#else
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return((((unsigned int)((CELL)(addr)))>>2)%MAVARS_HASH_SIZE);
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#endif
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}
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OPT_MAVAR_STATIC struct ma_h_entry *
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Yap_ALLOC_NEW_MASPACE(USES_REGS1)
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{
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ma_h_inner_struct *newS = LOCAL_ma_h_top;
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LOCAL_ma_h_top++;
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return newS;
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}
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OPT_MAVAR_STATIC int
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Yap_lookup_ma_var(CELL *addr USES_REGS) {
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unsigned int i = Yap_MAVAR_HASH(addr PASS_REGS);
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struct ma_h_entry *nptr, *optr;
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if (LOCAL_ma_hash_table[i].timestmp != LOCAL_ma_timestamp) {
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LOCAL_ma_hash_table[i].timestmp = LOCAL_ma_timestamp;
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LOCAL_ma_hash_table[i].val.addr = addr;
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LOCAL_ma_hash_table[i].val.next = NULL;
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return FALSE;
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}
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if (LOCAL_ma_hash_table[i].val.addr == addr)
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return TRUE;
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optr = &(LOCAL_ma_hash_table[i].val);
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nptr = LOCAL_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 TRUE;
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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 = Yap_ALLOC_NEW_MASPACE(PASS_REGS1);
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nptr->addr = addr;
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nptr->next = optr;
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return FALSE;
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}
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OPT_MAVAR_STATIC UInt
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Yap_NEW_MAHASH(ma_h_inner_struct *top USES_REGS) {
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UInt time = ++LOCAL_ma_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 < MAVARS_HASH_SIZE; i++)
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LOCAL_ma_hash_table[i].timestmp = 0;
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time = ++LOCAL_ma_timestamp;
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}
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LOCAL_ma_h_top = top;
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return time;
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}
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#else
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#define Yap_MAVAR_HASH(addr)
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#define Yap_ALLOC_NEW_MASPACE()
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#define Yap_lookup_ma_var(addr)
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#define Yap_NEW_MAHASH(top)
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#endif /* MULTI_ASSIGNMENT_VARIABLES */
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