147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
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/*************************************************************************
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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: Header for Global Stack garbage collector *
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* *
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*************************************************************************/
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/* macros used by garbage collection */
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#if TAG_64BITS
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#define MaskAdr (~(MBIT|RBIT|0x7L))
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#endif
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/* return pointer from object pointed to by ptr (remove tag & mark) */
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#ifdef TAGS_FAST_OPS
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#define GET_NEXT(val) ((CELL *)(IsVarTerm((val)) ? \
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(val) & MaskAdr : \
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( IsPairTerm((val)) ? \
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Unsigned(RepPair((val))) & MaskAdr : \
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( IsApplTerm((val)) ? \
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Unsigned(RepAppl((val))) & MaskAdr : \
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(val) & MaskAdr \
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) \
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) \
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) \
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)
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#else
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#ifdef TAG_LOW_BITS_32
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#if INVERT_RBIT
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#define GET_NEXT(val) ((CELL *) (((val) & ~(LowTagBits|MBIT))|RBIT))
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#else
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#define GET_NEXT(val) ((CELL *) ((val) & ~(LowTagBits|MBIT|RBIT)))
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#endif
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#else
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#define GET_NEXT(val) ((CELL *) ((val) & MaskAdr))
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#endif
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#endif
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/* is ptr a pointer to the heap? */
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#define ONHEAP(ptr) (CellPtr(ptr) >= H0 && CellPtr(ptr) < H)
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/* is ptr a pointer to code space? */
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#define ONCODE(ptr) (Addr(ptr) < HeapTop && Addr(ptr) >= HeapBase)
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/* is val pointing to something bound to the heap? */
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#define GCIsPrimitiveTerm(X) (!IsVarTerm(X) && IsAtomOrIntTerm(X))
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/* Does X point to an object in the heap */
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#define HEAP_PTR(val) (!GCIsPrimitiveTerm(val) && ONHEAP(GET_NEXT(val)))
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/*
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Heap_trail_entry must be very careful. We are looking at a valid
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trail entry if: it was between H0 and HB or between B and LCLO
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(that is, if it was covered by choicepoints at the time), and if it
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was a heap pointer.
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We can join the two conditions: (H0 =< val < HB || ((B < val < LCL0)
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&& H0 <= *DETAG(val) < H))
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*/
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#define HEAP_TRAIL_ENTRY(val) ((IsVarTerm(val)) && \
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((H0 <= CellPtr(val) && CellPtr(val)\
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< cp_H) || \
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(CellPtr(B) < CellPtr(val) && CellPtr(val) <= \
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LCL0 && HEAP_PTR(val))))
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/* is the object pointed to by ptr marked? */
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#ifdef TAGS_FAST_OPS
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#define MARKED_VAR(val) ((val) & MBIT)
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#define MARKED_COMP(val) (!((val) & MBIT))
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#define MARKED(val) ((Int)(val) < 0 && (((val) & LowTagBits) != 2)\
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? \
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!((val) & MBIT) : ((val) & MBIT))
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#else
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#define MARKED(val) ((val) & MBIT)
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#endif
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#define MARK(ptr) (*(ptr) ^= MBIT) /* mark the object pointed to by ptr */
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#define MARK_CELL(val) ((val) ^ MBIT) /* mark the object pointed to by ptr */
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#define UNMARK(ptr) (*(ptr) ^= MBIT) /* unmark the object pointed to by ptr */
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#define UNMARK_CELL(val) ((val) ^ MBIT) /* unmark the object pointed to by ptr */
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#ifdef TAGS_FAST_OPS
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#define RMARKED(val) (!GCIsPrimitiveTerm(val) && (IsVarTerm(val) ?\
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((val) & RBIT) : !((val) & RBIT)))
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#define UNMARKED(val) ((Int)(val) < 0 && (((val) & LowTagBits) != 2)\
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? \
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((val) | MBIT) : ((val) & ~MBIT))
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#define ENSURE_MARKED(val) ((Int)(val) < 0 && (((val) & LowTagBits) != 2)\
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? \
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((val) & ~MBIT) : ((val) | MBIT))
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#else
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#if INVERT_RBIT
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#define RMARKED(val) (!GCIsPrimitiveTerm(val) && !((val) & RBIT))
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#else
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#define RMARKED(val) (!GCIsPrimitiveTerm(val) && ((val) & RBIT))
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#endif
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#endif
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/* is the object pointed to by ptr marked as in a relocation chain? */
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#if LONG_ADDRESSES
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#ifdef TAG_LOW_BITS_32
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#define TAG(X) ((X) & LowTagBits)
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#else
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#ifdef TAG_64BITS
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#define TAG(X) ((X) & MKTAG(0x0,0x7))
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#else
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#define TAG(X) ((X) & 0x80000003L)
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#endif
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#endif
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#else
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#define TAG(X) ((X) & 0x98000000L)
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#endif
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typedef CELL *CELL_PTR;
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#define ENVSIZE(E) EnvSize(((CELL *)E)[E_CP])
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extern UInt total_marked;
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void STD_PROTO(mark_variable, (CELL *));
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void STD_PROTO(mark_external_reference, (CELL *));
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