+++ /dev/null
-/*
- * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
- * Copyright (c) 2001 by Hewlett-Packard Company. All rights reserved.
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- *
- */
-
-/* Private declarations of GC marker data structures and macros */
-
-/*
- * Declarations of mark stack. Needed by marker and client supplied mark
- * routines. Transitively include gc_priv.h.
- * (Note that gc_priv.h should not be included before this, since this
- * includes dbg_mlc.h, which wants to include gc_priv.h AFTER defining
- * I_HIDE_POINTERS.)
- */
-#ifndef GC_PMARK_H
-# define GC_PMARK_H
-
-# if defined(KEEP_BACK_PTRS) || defined(PRINT_BLACK_LIST)
-# include "dbg_mlc.h"
-# endif
-# ifndef GC_MARK_H
-# include "../gc_mark.h"
-# endif
-# ifndef GC_PRIVATE_H
-# include "gc_priv.h"
-# endif
-
-/* The real declarations of the following is in gc_priv.h, so that */
-/* we can avoid scanning the following table. */
-/*
-extern mark_proc GC_mark_procs[MAX_MARK_PROCS];
-*/
-
-/*
- * Mark descriptor stuff that should remain private for now, mostly
- * because it's hard to export WORDSZ without including gcconfig.h.
- */
-# define BITMAP_BITS (WORDSZ - GC_DS_TAG_BITS)
-# define PROC(descr) \
- (GC_mark_procs[((descr) >> GC_DS_TAG_BITS) & (GC_MAX_MARK_PROCS-1)])
-# define ENV(descr) \
- ((descr) >> (GC_DS_TAG_BITS + GC_LOG_MAX_MARK_PROCS))
-# define MAX_ENV \
- (((word)1 << (WORDSZ - GC_DS_TAG_BITS - GC_LOG_MAX_MARK_PROCS)) - 1)
-
-
-extern word GC_n_mark_procs;
-
-/* Number of mark stack entries to discard on overflow. */
-#define GC_MARK_STACK_DISCARDS (INITIAL_MARK_STACK_SIZE/8)
-
-typedef struct GC_ms_entry {
- GC_word * mse_start; /* First word of object */
- GC_word mse_descr; /* Descriptor; low order two bits are tags, */
- /* identifying the upper 30 bits as one of the */
- /* following: */
-} mse;
-
-extern word GC_mark_stack_size;
-
-extern mse * GC_mark_stack_limit;
-
-#ifdef PARALLEL_MARK
- extern mse * VOLATILE GC_mark_stack_top;
-#else
- extern mse * GC_mark_stack_top;
-#endif
-
-extern mse * GC_mark_stack;
-
-#ifdef PARALLEL_MARK
- /*
- * Allow multiple threads to participate in the marking process.
- * This works roughly as follows:
- * The main mark stack never shrinks, but it can grow.
- *
- * The initiating threads holds the GC lock, and sets GC_help_wanted.
- *
- * Other threads:
- * 1) update helper_count (while holding mark_lock.)
- * 2) allocate a local mark stack
- * repeatedly:
- * 3) Steal a global mark stack entry by atomically replacing
- * its descriptor with 0.
- * 4) Copy it to the local stack.
- * 5) Mark on the local stack until it is empty, or
- * it may be profitable to copy it back.
- * 6) If necessary, copy local stack to global one,
- * holding mark lock.
- * 7) Stop when the global mark stack is empty.
- * 8) decrement helper_count (holding mark_lock).
- *
- * This is an experiment to see if we can do something along the lines
- * of the University of Tokyo SGC in a less intrusive, though probably
- * also less performant, way.
- */
- void GC_do_parallel_mark();
- /* inititate parallel marking. */
-
- extern GC_bool GC_help_wanted; /* Protected by mark lock */
- extern unsigned GC_helper_count; /* Number of running helpers. */
- /* Protected by mark lock */
- extern unsigned GC_active_count; /* Number of active helpers. */
- /* Protected by mark lock */
- /* May increase and decrease */
- /* within each mark cycle. But */
- /* once it returns to 0, it */
- /* stays zero for the cycle. */
- /* GC_mark_stack_top is also protected by mark lock. */
- extern mse * VOLATILE GC_first_nonempty;
- /* Lowest entry on mark stack */
- /* that may be nonempty. */
- /* Updated only by initiating */
- /* thread. */
- /*
- * GC_notify_all_marker() is used when GC_help_wanted is first set,
- * when the last helper becomes inactive,
- * when something is added to the global mark stack, and just after
- * GC_mark_no is incremented.
- * This could be split into multiple CVs (and probably should be to
- * scale to really large numbers of processors.)
- */
-#endif /* PARALLEL_MARK */
-
-/* Return a pointer to within 1st page of object. */
-/* Set *new_hdr_p to corr. hdr. */
-#ifdef __STDC__
-# ifdef PRINT_BLACK_LIST
- ptr_t GC_find_start(ptr_t current, hdr *hhdr, hdr **new_hdr_p,
- ptr_t source);
-# else
- ptr_t GC_find_start(ptr_t current, hdr *hhdr, hdr **new_hdr_p);
-# endif
-#else
- ptr_t GC_find_start();
-#endif
-
-mse *GC_signal_mark_stack_overflow(mse *msp);
-
-# ifdef GATHERSTATS
-# define ADD_TO_ATOMIC(sz) GC_atomic_in_use += (sz)
-# define ADD_TO_COMPOSITE(sz) GC_composite_in_use += (sz)
-# else
-# define ADD_TO_ATOMIC(sz)
-# define ADD_TO_COMPOSITE(sz)
-# endif
-
-/* Push the object obj with corresponding heap block header hhdr onto */
-/* the mark stack. */
-# define PUSH_OBJ(obj, hhdr, mark_stack_top, mark_stack_limit) \
-{ \
- register word _descr = (hhdr) -> hb_descr; \
- \
- if (_descr == 0) { \
- ADD_TO_ATOMIC((hhdr) -> hb_sz); \
- } else { \
- ADD_TO_COMPOSITE((hhdr) -> hb_sz); \
- mark_stack_top++; \
- if (mark_stack_top >= mark_stack_limit) { \
- mark_stack_top = GC_signal_mark_stack_overflow(mark_stack_top); \
- } \
- mark_stack_top -> mse_start = (obj); \
- mark_stack_top -> mse_descr = _descr; \
- } \
-}
-
-#ifdef PRINT_BLACK_LIST
-# define GC_FIND_START(current, hhdr, new_hdr_p, source) \
- GC_find_start(current, hhdr, new_hdr_p, source)
-#else
-# define GC_FIND_START(current, hhdr, new_hdr_p, source) \
- GC_find_start(current, hhdr, new_hdr_p)
-#endif
-
-/* Push the contents of current onto the mark stack if it is a valid */
-/* ptr to a currently unmarked object. Mark it. */
-/* If we assumed a standard-conforming compiler, we could probably */
-/* generate the exit_label transparently. */
-# define PUSH_CONTENTS(current, mark_stack_top, mark_stack_limit, \
- source, exit_label) \
-{ \
- hdr * my_hhdr; \
- ptr_t my_current = current; \
- \
- GET_HDR(my_current, my_hhdr); \
- if (IS_FORWARDING_ADDR_OR_NIL(my_hhdr)) { \
- hdr * new_hdr = GC_invalid_header; \
- my_current = GC_FIND_START(my_current, my_hhdr, \
- &new_hdr, (word)source); \
- my_hhdr = new_hdr; \
- } \
- PUSH_CONTENTS_HDR(my_current, mark_stack_top, mark_stack_limit, \
- source, exit_label, my_hhdr); \
-exit_label: ; \
-}
-
-/* As above, but use header cache for header lookup. */
-# define HC_PUSH_CONTENTS(current, mark_stack_top, mark_stack_limit, \
- source, exit_label) \
-{ \
- hdr * my_hhdr; \
- ptr_t my_current = current; \
- \
- HC_GET_HDR(my_current, my_hhdr, source); \
- PUSH_CONTENTS_HDR(my_current, mark_stack_top, mark_stack_limit, \
- source, exit_label, my_hhdr); \
-exit_label: ; \
-}
-
-/* Set mark bit, exit if it was already set. */
-
-# ifdef USE_MARK_BYTES
- /* Unlike the mark bit case, there is a race here, and we may set */
- /* the bit twice in the concurrent case. This can result in the */
- /* object being pushed twice. But that's only a performance issue. */
-# define SET_MARK_BIT_EXIT_IF_SET(hhdr,displ,exit_label) \
- { \
- register VOLATILE char * mark_byte_addr = \
- hhdr -> hb_marks + ((displ) >> 1); \
- register char mark_byte = *mark_byte_addr; \
- \
- if (mark_byte) goto exit_label; \
- *mark_byte_addr = 1; \
- }
-# else
-# define SET_MARK_BIT_EXIT_IF_SET(hhdr,displ,exit_label) \
- { \
- register word * mark_word_addr = hhdr -> hb_marks + divWORDSZ(displ); \
- \
- OR_WORD_EXIT_IF_SET(mark_word_addr, (word)1 << modWORDSZ(displ), \
- exit_label); \
- }
-# endif /* USE_MARK_BYTES */
-
-/* If the mark bit corresponding to current is not set, set it, and */
-/* push the contents of the object on the mark stack. For a small */
-/* object we assume that current is the (possibly interior) pointer */
-/* to the object. For large objects we assume that current points */
-/* to somewhere inside the first page of the object. If */
-/* GC_all_interior_pointers is set, it may have been previously */
-/* adjusted to make that true. */
-# define PUSH_CONTENTS_HDR(current, mark_stack_top, mark_stack_limit, \
- source, exit_label, hhdr) \
-{ \
- int displ; /* Displacement in block; first bytes, then words */ \
- int map_entry; \
- \
- displ = HBLKDISPL(current); \
- map_entry = MAP_ENTRY((hhdr -> hb_map), displ); \
- displ = BYTES_TO_WORDS(displ); \
- if (map_entry > CPP_MAX_OFFSET) { \
- if (map_entry == OFFSET_TOO_BIG) { \
- map_entry = displ % (hhdr -> hb_sz); \
- displ -= map_entry; \
- if (displ + (hhdr -> hb_sz) > BYTES_TO_WORDS(HBLKSIZE)) { \
- GC_ADD_TO_BLACK_LIST_NORMAL((word)current, source); \
- goto exit_label; \
- } \
- } else { \
- GC_ADD_TO_BLACK_LIST_NORMAL((word)current, source); goto exit_label; \
- } \
- } else { \
- displ -= map_entry; \
- } \
- GC_ASSERT(displ >= 0 && displ < MARK_BITS_PER_HBLK); \
- SET_MARK_BIT_EXIT_IF_SET(hhdr, displ, exit_label); \
- GC_STORE_BACK_PTR((ptr_t)source, (ptr_t)HBLKPTR(current) \
- + WORDS_TO_BYTES(displ)); \
- PUSH_OBJ(((word *)(HBLKPTR(current)) + displ), hhdr, \
- mark_stack_top, mark_stack_limit) \
-}
-
-#if defined(PRINT_BLACK_LIST) || defined(KEEP_BACK_PTRS)
-# define PUSH_ONE_CHECKED_STACK(p, source) \
- GC_mark_and_push_stack(p, (ptr_t)(source))
-#else
-# define PUSH_ONE_CHECKED_STACK(p, source) \
- GC_mark_and_push_stack(p)
-#endif
-
-/*
- * Push a single value onto mark stack. Mark from the object pointed to by p.
- * P is considered valid even if it is an interior pointer.
- * Previously marked objects are not pushed. Hence we make progress even
- * if the mark stack overflows.
- */
-# define GC_PUSH_ONE_STACK(p, source) \
- if ((ptr_t)(p) >= (ptr_t)GC_least_plausible_heap_addr \
- && (ptr_t)(p) < (ptr_t)GC_greatest_plausible_heap_addr) { \
- PUSH_ONE_CHECKED_STACK(p, source); \
- }
-
-/*
- * As above, but interior pointer recognition as for
- * normal for heap pointers.
- */
-# define GC_PUSH_ONE_HEAP(p,source) \
- if ((ptr_t)(p) >= (ptr_t)GC_least_plausible_heap_addr \
- && (ptr_t)(p) < (ptr_t)GC_greatest_plausible_heap_addr) { \
- GC_mark_stack_top = GC_mark_and_push( \
- (GC_PTR)(p), GC_mark_stack_top, \
- GC_mark_stack_limit, (GC_PTR *)(source)); \
- }
-
-/* Mark starting at mark stack entry top (incl.) down to */
-/* mark stack entry bottom (incl.). Stop after performing */
-/* about one page worth of work. Return the new mark stack */
-/* top entry. */
-mse * GC_mark_from GC_PROTO((mse * top, mse * bottom, mse *limit));
-
-#define MARK_FROM_MARK_STACK() \
- GC_mark_stack_top = GC_mark_from(GC_mark_stack_top, \
- GC_mark_stack, \
- GC_mark_stack + GC_mark_stack_size);
-
-/*
- * Mark from one finalizable object using the specified
- * mark proc. May not mark the object pointed to by
- * real_ptr. That is the job of the caller, if appropriate
- */
-# define GC_MARK_FO(real_ptr, mark_proc) \
-{ \
- (*(mark_proc))(real_ptr); \
- while (!GC_mark_stack_empty()) MARK_FROM_MARK_STACK(); \
- if (GC_mark_state != MS_NONE) { \
- GC_set_mark_bit(real_ptr); \
- while (!GC_mark_some((ptr_t)0)) {} \
- } \
-}
-
-extern GC_bool GC_mark_stack_too_small;
- /* We need a larger mark stack. May be */
- /* set by client supplied mark routines.*/
-
-typedef int mark_state_t; /* Current state of marking, as follows:*/
- /* Used to remember where we are during */
- /* concurrent marking. */
-
- /* We say something is dirty if it was */
- /* written since the last time we */
- /* retrieved dirty bits. We say it's */
- /* grungy if it was marked dirty in the */
- /* last set of bits we retrieved. */
-
- /* Invariant I: all roots and marked */
- /* objects p are either dirty, or point */
- /* to objects q that are either marked */
- /* or a pointer to q appears in a range */
- /* on the mark stack. */
-
-# define MS_NONE 0 /* No marking in progress. I holds. */
- /* Mark stack is empty. */
-
-# define MS_PUSH_RESCUERS 1 /* Rescuing objects are currently */
- /* being pushed. I holds, except */
- /* that grungy roots may point to */
- /* unmarked objects, as may marked */
- /* grungy objects above scan_ptr. */
-
-# define MS_PUSH_UNCOLLECTABLE 2
- /* I holds, except that marked */
- /* uncollectable objects above scan_ptr */
- /* may point to unmarked objects. */
- /* Roots may point to unmarked objects */
-
-# define MS_ROOTS_PUSHED 3 /* I holds, mark stack may be nonempty */
-
-# define MS_PARTIALLY_INVALID 4 /* I may not hold, e.g. because of M.S. */
- /* overflow. However marked heap */
- /* objects below scan_ptr point to */
- /* marked or stacked objects. */
-
-# define MS_INVALID 5 /* I may not hold. */
-
-extern mark_state_t GC_mark_state;
-
-#endif /* GC_PMARK_H */
-
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