+++ /dev/null
-/*
- * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
- * Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
- * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
- * Copyright (c) 1999 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.
- */
-
-#include <stdio.h>
-#include "private/gc_priv.h"
-
-signed_word GC_mem_found = 0;
- /* Number of words of memory reclaimed */
-
-#if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
- word GC_fl_builder_count = 0;
- /* Number of threads currently building free lists without */
- /* holding GC lock. It is not safe to collect if this is */
- /* nonzero. */
-#endif /* PARALLEL_MARK */
-
-static void report_leak(p, sz)
-ptr_t p;
-word sz;
-{
- if (HDR(p) -> hb_obj_kind == PTRFREE) {
- GC_err_printf0("Leaked atomic object at ");
- } else {
- GC_err_printf0("Leaked composite object at ");
- }
- GC_print_heap_obj(p);
- GC_err_printf0("\n");
-}
-
-# define FOUND_FREE(hblk, word_no) \
- { \
- report_leak((ptr_t)hblk + WORDS_TO_BYTES(word_no), \
- HDR(hblk) -> hb_sz); \
- }
-
-/*
- * reclaim phase
- *
- */
-
-
-/*
- * Test whether a block is completely empty, i.e. contains no marked
- * objects. This does not require the block to be in physical
- * memory.
- */
-
-GC_bool GC_block_empty(hhdr)
-register hdr * hhdr;
-{
- /* We treat hb_marks as an array of words here, even if it is */
- /* actually an array of bytes. Since we only check for zero, there */
- /* are no endian-ness issues. */
- register word *p = (word *)(&(hhdr -> hb_marks[0]));
- register word * plim =
- (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
- while (p < plim) {
- if (*p++) return(FALSE);
- }
- return(TRUE);
-}
-
-/* The following functions sometimes return a DONT_KNOW value. */
-#define DONT_KNOW 2
-
-#ifdef SMALL_CONFIG
-# define GC_block_nearly_full1(hhdr, pat1) DONT_KNOW
-# define GC_block_nearly_full3(hhdr, pat1, pat2) DONT_KNOW
-# define GC_block_nearly_full(hhdr) DONT_KNOW
-#endif
-
-#if !defined(SMALL_CONFIG) && defined(USE_MARK_BYTES)
-
-# define GC_block_nearly_full1(hhdr, pat1) GC_block_nearly_full(hhdr)
-# define GC_block_nearly_full3(hhdr, pat1, pat2) GC_block_nearly_full(hhdr)
-
-
-GC_bool GC_block_nearly_full(hhdr)
-register hdr * hhdr;
-{
- /* We again treat hb_marks as an array of words, even though it */
- /* isn't. We first sum up all the words, resulting in a word */
- /* containing 4 or 8 separate partial sums. */
- /* We then sum the bytes in the word of partial sums. */
- /* This is still endian independant. This fails if the partial */
- /* sums can overflow. */
-# if (BYTES_TO_WORDS(MARK_BITS_SZ)) >= 256
- --> potential overflow; fix the code
-# endif
- register word *p = (word *)(&(hhdr -> hb_marks[0]));
- register word * plim =
- (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
- word sum_vector = 0;
- unsigned sum;
- while (p < plim) {
- sum_vector += *p;
- ++p;
- }
- sum = 0;
- while (sum_vector > 0) {
- sum += sum_vector & 0xff;
- sum_vector >>= 8;
- }
- return (sum > BYTES_TO_WORDS(7*HBLKSIZE/8)/(hhdr -> hb_sz));
-}
-#endif /* USE_MARK_BYTES */
-
-#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
-
-/*
- * Test whether nearly all of the mark words consist of the same
- * repeating pattern.
- */
-#define FULL_THRESHOLD (MARK_BITS_SZ/16)
-
-GC_bool GC_block_nearly_full1(hhdr, pat1)
-hdr *hhdr;
-word pat1;
-{
- unsigned i;
- unsigned misses = 0;
- GC_ASSERT((MARK_BITS_SZ & 1) == 0);
- for (i = 0; i < MARK_BITS_SZ; ++i) {
- if ((hhdr -> hb_marks[i] | ~pat1) != ONES) {
- if (++misses > FULL_THRESHOLD) return FALSE;
- }
- }
- return TRUE;
-}
-
-/*
- * Test whether the same repeating 3 word pattern occurs in nearly
- * all the mark bit slots.
- * This is used as a heuristic, so we're a bit sloppy and ignore
- * the last one or two words.
- */
-GC_bool GC_block_nearly_full3(hhdr, pat1, pat2, pat3)
-hdr *hhdr;
-word pat1, pat2, pat3;
-{
- unsigned i;
- unsigned misses = 0;
-
- if (MARK_BITS_SZ < 4) {
- return DONT_KNOW;
- }
- for (i = 0; i < MARK_BITS_SZ - 2; i += 3) {
- if ((hhdr -> hb_marks[i] | ~pat1) != ONES) {
- if (++misses > FULL_THRESHOLD) return FALSE;
- }
- if ((hhdr -> hb_marks[i+1] | ~pat2) != ONES) {
- if (++misses > FULL_THRESHOLD) return FALSE;
- }
- if ((hhdr -> hb_marks[i+2] | ~pat3) != ONES) {
- if (++misses > FULL_THRESHOLD) return FALSE;
- }
- }
- return TRUE;
-}
-
-/* Check whether a small object block is nearly full by looking at only */
-/* the mark bits. */
-/* We manually precomputed the mark bit patterns that need to be */
-/* checked for, and we give up on the ones that are unlikely to occur, */
-/* or have period > 3. */
-/* This would be a lot easier with a mark bit per object instead of per */
-/* word, but that would rewuire computing object numbers in the mark */
-/* loop, which would require different data structures ... */
-GC_bool GC_block_nearly_full(hhdr)
-hdr *hhdr;
-{
- int sz = hhdr -> hb_sz;
-
-# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
- return DONT_KNOW; /* Shouldn't be used in any standard config. */
-# endif
-# if CPP_WORDSZ == 32
- switch(sz) {
- case 1:
- return GC_block_nearly_full1(hhdr, 0xffffffffl);
- case 2:
- return GC_block_nearly_full1(hhdr, 0x55555555l);
- case 4:
- return GC_block_nearly_full1(hhdr, 0x11111111l);
- case 6:
- return GC_block_nearly_full3(hhdr, 0x41041041l,
- 0x10410410l,
- 0x04104104l);
- case 8:
- return GC_block_nearly_full1(hhdr, 0x01010101l);
- case 12:
- return GC_block_nearly_full3(hhdr, 0x01001001l,
- 0x10010010l,
- 0x00100100l);
- case 16:
- return GC_block_nearly_full1(hhdr, 0x00010001l);
- case 32:
- return GC_block_nearly_full1(hhdr, 0x00000001l);
- default:
- return DONT_KNOW;
- }
-# endif
-# if CPP_WORDSZ == 64
- switch(sz) {
- case 1:
- return GC_block_nearly_full1(hhdr, 0xffffffffffffffffl);
- case 2:
- return GC_block_nearly_full1(hhdr, 0x5555555555555555l);
- case 4:
- return GC_block_nearly_full1(hhdr, 0x1111111111111111l);
- case 6:
- return GC_block_nearly_full3(hhdr, 0x1041041041041041l,
- 0x4104104104104104l,
- 0x0410410410410410l);
- case 8:
- return GC_block_nearly_full1(hhdr, 0x0101010101010101l);
- case 12:
- return GC_block_nearly_full3(hhdr, 0x1001001001001001l,
- 0x0100100100100100l,
- 0x0010010010010010l);
- case 16:
- return GC_block_nearly_full1(hhdr, 0x0001000100010001l);
- case 32:
- return GC_block_nearly_full1(hhdr, 0x0000000100000001l);
- default:
- return DONT_KNOW;
- }
-# endif
-}
-#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
-
-/* We keep track of reclaimed memory if we are either asked to, or */
-/* we are using the parallel marker. In the latter case, we assume */
-/* that most allocation goes through GC_malloc_many for scalability. */
-/* GC_malloc_many needs the count anyway. */
-# if defined(GATHERSTATS) || defined(PARALLEL_MARK)
-# define INCR_WORDS(sz) n_words_found += (sz)
-# define COUNT_PARAM , count
-# define COUNT_ARG , count
-# define COUNT_DECL signed_word * count;
-# define NWORDS_DECL signed_word n_words_found = 0;
-# define COUNT_UPDATE *count += n_words_found;
-# define MEM_FOUND_ADDR , &GC_mem_found
-# else
-# define INCR_WORDS(sz)
-# define COUNT_PARAM
-# define COUNT_ARG
-# define COUNT_DECL
-# define NWORDS_DECL
-# define COUNT_UPDATE
-# define MEM_FOUND_ADDR
-# endif
-/*
- * Restore unmarked small objects in h of size sz to the object
- * free list. Returns the new list.
- * Clears unmarked objects.
- */
-/*ARGSUSED*/
-ptr_t GC_reclaim_clear(hbp, hhdr, sz, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-register hdr * hhdr;
-register ptr_t list;
-register word sz;
-COUNT_DECL
-{
- register int word_no;
- register word *p, *q, *plim;
- NWORDS_DECL
-
- GC_ASSERT(hhdr == GC_find_header((ptr_t)hbp));
- p = (word *)(hbp->hb_body);
- word_no = 0;
- plim = (word *)((((word)hbp) + HBLKSIZE)
- - WORDS_TO_BYTES(sz));
-
- /* go through all words in block */
- while( p <= plim ) {
- if( mark_bit_from_hdr(hhdr, word_no) ) {
- p += sz;
- } else {
- INCR_WORDS(sz);
- /* object is available - put on list */
- obj_link(p) = list;
- list = ((ptr_t)p);
- /* Clear object, advance p to next object in the process */
- q = p + sz;
-# ifdef USE_MARK_BYTES
- GC_ASSERT(!(sz & 1)
- && !((word)p & (2 * sizeof(word) - 1)));
- p[1] = 0;
- p += 2;
- while (p < q) {
- CLEAR_DOUBLE(p);
- p += 2;
- }
-# else
- p++; /* Skip link field */
- while (p < q) {
- *p++ = 0;
- }
-# endif
- }
- word_no += sz;
- }
- COUNT_UPDATE
- return(list);
-}
-
-#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
-
-/*
- * A special case for 2 word composite objects (e.g. cons cells):
- */
-/*ARGSUSED*/
-ptr_t GC_reclaim_clear2(hbp, hhdr, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-register ptr_t list;
-COUNT_DECL
-{
- register word * mark_word_addr = &(hhdr->hb_marks[0]);
- register word *p, *plim;
- register word mark_word;
- register int i;
- NWORDS_DECL
-# define DO_OBJ(start_displ) \
- if (!(mark_word & ((word)1 << start_displ))) { \
- p[start_displ] = (word)list; \
- list = (ptr_t)(p+start_displ); \
- p[start_displ+1] = 0; \
- INCR_WORDS(2); \
- }
-
- p = (word *)(hbp->hb_body);
- plim = (word *)(((word)hbp) + HBLKSIZE);
-
- /* go through all words in block */
- while( p < plim ) {
- mark_word = *mark_word_addr++;
- for (i = 0; i < WORDSZ; i += 8) {
- DO_OBJ(0);
- DO_OBJ(2);
- DO_OBJ(4);
- DO_OBJ(6);
- p += 8;
- mark_word >>= 8;
- }
- }
- COUNT_UPDATE
- return(list);
-# undef DO_OBJ
-}
-
-/*
- * Another special case for 4 word composite objects:
- */
-/*ARGSUSED*/
-ptr_t GC_reclaim_clear4(hbp, hhdr, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-register ptr_t list;
-COUNT_DECL
-{
- register word * mark_word_addr = &(hhdr->hb_marks[0]);
- register word *p, *plim;
- register word mark_word;
- NWORDS_DECL
-# define DO_OBJ(start_displ) \
- if (!(mark_word & ((word)1 << start_displ))) { \
- p[start_displ] = (word)list; \
- list = (ptr_t)(p+start_displ); \
- p[start_displ+1] = 0; \
- CLEAR_DOUBLE(p + start_displ + 2); \
- INCR_WORDS(4); \
- }
-
- p = (word *)(hbp->hb_body);
- plim = (word *)(((word)hbp) + HBLKSIZE);
-
- /* go through all words in block */
- while( p < plim ) {
- mark_word = *mark_word_addr++;
- DO_OBJ(0);
- DO_OBJ(4);
- DO_OBJ(8);
- DO_OBJ(12);
- DO_OBJ(16);
- DO_OBJ(20);
- DO_OBJ(24);
- DO_OBJ(28);
-# if CPP_WORDSZ == 64
- DO_OBJ(32);
- DO_OBJ(36);
- DO_OBJ(40);
- DO_OBJ(44);
- DO_OBJ(48);
- DO_OBJ(52);
- DO_OBJ(56);
- DO_OBJ(60);
-# endif
- p += WORDSZ;
- }
- COUNT_UPDATE
- return(list);
-# undef DO_OBJ
-}
-
-#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
-
-/* The same thing, but don't clear objects: */
-/*ARGSUSED*/
-ptr_t GC_reclaim_uninit(hbp, hhdr, sz, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-register hdr * hhdr;
-register ptr_t list;
-register word sz;
-COUNT_DECL
-{
- register int word_no = 0;
- register word *p, *plim;
- NWORDS_DECL
-
- p = (word *)(hbp->hb_body);
- plim = (word *)((((word)hbp) + HBLKSIZE)
- - WORDS_TO_BYTES(sz));
-
- /* go through all words in block */
- while( p <= plim ) {
- if( !mark_bit_from_hdr(hhdr, word_no) ) {
- INCR_WORDS(sz);
- /* object is available - put on list */
- obj_link(p) = list;
- list = ((ptr_t)p);
- }
- p += sz;
- word_no += sz;
- }
- COUNT_UPDATE
- return(list);
-}
-
-/* Don't really reclaim objects, just check for unmarked ones: */
-/*ARGSUSED*/
-void GC_reclaim_check(hbp, hhdr, sz)
-register struct hblk *hbp; /* ptr to current heap block */
-register hdr * hhdr;
-register word sz;
-{
- register int word_no = 0;
- register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
-
- p = (word *)(hbp->hb_body);
- plim = (word *)((((word)hbp) + HBLKSIZE)
- - WORDS_TO_BYTES(sz));
-
- /* go through all words in block */
- while( p <= plim ) {
- if( !mark_bit_from_hdr(hhdr, word_no) ) {
- FOUND_FREE(hbp, word_no);
- }
- p += sz;
- word_no += sz;
- }
-}
-
-#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
-/*
- * Another special case for 2 word atomic objects:
- */
-/*ARGSUSED*/
-ptr_t GC_reclaim_uninit2(hbp, hhdr, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-register ptr_t list;
-COUNT_DECL
-{
- register word * mark_word_addr = &(hhdr->hb_marks[0]);
- register word *p, *plim;
- register word mark_word;
- register int i;
- NWORDS_DECL
-# define DO_OBJ(start_displ) \
- if (!(mark_word & ((word)1 << start_displ))) { \
- p[start_displ] = (word)list; \
- list = (ptr_t)(p+start_displ); \
- INCR_WORDS(2); \
- }
-
- p = (word *)(hbp->hb_body);
- plim = (word *)(((word)hbp) + HBLKSIZE);
-
- /* go through all words in block */
- while( p < plim ) {
- mark_word = *mark_word_addr++;
- for (i = 0; i < WORDSZ; i += 8) {
- DO_OBJ(0);
- DO_OBJ(2);
- DO_OBJ(4);
- DO_OBJ(6);
- p += 8;
- mark_word >>= 8;
- }
- }
- COUNT_UPDATE
- return(list);
-# undef DO_OBJ
-}
-
-/*
- * Another special case for 4 word atomic objects:
- */
-/*ARGSUSED*/
-ptr_t GC_reclaim_uninit4(hbp, hhdr, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-register ptr_t list;
-COUNT_DECL
-{
- register word * mark_word_addr = &(hhdr->hb_marks[0]);
- register word *p, *plim;
- register word mark_word;
- NWORDS_DECL
-# define DO_OBJ(start_displ) \
- if (!(mark_word & ((word)1 << start_displ))) { \
- p[start_displ] = (word)list; \
- list = (ptr_t)(p+start_displ); \
- INCR_WORDS(4); \
- }
-
- p = (word *)(hbp->hb_body);
- plim = (word *)(((word)hbp) + HBLKSIZE);
-
- /* go through all words in block */
- while( p < plim ) {
- mark_word = *mark_word_addr++;
- DO_OBJ(0);
- DO_OBJ(4);
- DO_OBJ(8);
- DO_OBJ(12);
- DO_OBJ(16);
- DO_OBJ(20);
- DO_OBJ(24);
- DO_OBJ(28);
-# if CPP_WORDSZ == 64
- DO_OBJ(32);
- DO_OBJ(36);
- DO_OBJ(40);
- DO_OBJ(44);
- DO_OBJ(48);
- DO_OBJ(52);
- DO_OBJ(56);
- DO_OBJ(60);
-# endif
- p += WORDSZ;
- }
- COUNT_UPDATE
- return(list);
-# undef DO_OBJ
-}
-
-/* Finally the one word case, which never requires any clearing: */
-/*ARGSUSED*/
-ptr_t GC_reclaim1(hbp, hhdr, list COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-register ptr_t list;
-COUNT_DECL
-{
- register word * mark_word_addr = &(hhdr->hb_marks[0]);
- register word *p, *plim;
- register word mark_word;
- register int i;
- NWORDS_DECL
-# define DO_OBJ(start_displ) \
- if (!(mark_word & ((word)1 << start_displ))) { \
- p[start_displ] = (word)list; \
- list = (ptr_t)(p+start_displ); \
- INCR_WORDS(1); \
- }
-
- p = (word *)(hbp->hb_body);
- plim = (word *)(((word)hbp) + HBLKSIZE);
-
- /* go through all words in block */
- while( p < plim ) {
- mark_word = *mark_word_addr++;
- for (i = 0; i < WORDSZ; i += 4) {
- DO_OBJ(0);
- DO_OBJ(1);
- DO_OBJ(2);
- DO_OBJ(3);
- p += 4;
- mark_word >>= 4;
- }
- }
- COUNT_UPDATE
- return(list);
-# undef DO_OBJ
-}
-
-#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
-
-/*
- * Generic procedure to rebuild a free list in hbp.
- * Also called directly from GC_malloc_many.
- */
-ptr_t GC_reclaim_generic(hbp, hhdr, sz, init, list COUNT_PARAM)
-struct hblk *hbp; /* ptr to current heap block */
-hdr * hhdr;
-GC_bool init;
-ptr_t list;
-word sz;
-COUNT_DECL
-{
- ptr_t result = list;
-
- GC_ASSERT(GC_find_header((ptr_t)hbp) == hhdr);
- GC_remove_protection(hbp, 1, (hhdr)->hb_descr == 0 /* Pointer-free? */);
- if (init) {
- switch(sz) {
-# if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
- case 1:
- /* We now issue the hint even if GC_nearly_full returned */
- /* DONT_KNOW. */
- result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
- break;
- case 2:
- result = GC_reclaim_clear2(hbp, hhdr, list COUNT_ARG);
- break;
- case 4:
- result = GC_reclaim_clear4(hbp, hhdr, list COUNT_ARG);
- break;
-# endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
- default:
- result = GC_reclaim_clear(hbp, hhdr, sz, list COUNT_ARG);
- break;
- }
- } else {
- GC_ASSERT((hhdr)->hb_descr == 0 /* Pointer-free block */);
- switch(sz) {
-# if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
- case 1:
- result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
- break;
- case 2:
- result = GC_reclaim_uninit2(hbp, hhdr, list COUNT_ARG);
- break;
- case 4:
- result = GC_reclaim_uninit4(hbp, hhdr, list COUNT_ARG);
- break;
-# endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
- default:
- result = GC_reclaim_uninit(hbp, hhdr, sz, list COUNT_ARG);
- break;
- }
- }
- if (IS_UNCOLLECTABLE(hhdr -> hb_obj_kind)) GC_set_hdr_marks(hhdr);
- return result;
-}
-
-/*
- * Restore unmarked small objects in the block pointed to by hbp
- * to the appropriate object free list.
- * If entirely empty blocks are to be completely deallocated, then
- * caller should perform that check.
- */
-void GC_reclaim_small_nonempty_block(hbp, report_if_found COUNT_PARAM)
-register struct hblk *hbp; /* ptr to current heap block */
-int report_if_found; /* Abort if a reclaimable object is found */
-COUNT_DECL
-{
- hdr *hhdr = HDR(hbp);
- word sz = hhdr -> hb_sz;
- int kind = hhdr -> hb_obj_kind;
- struct obj_kind * ok = &GC_obj_kinds[kind];
- ptr_t * flh = &(ok -> ok_freelist[sz]);
-
- hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
-
- if (report_if_found) {
- GC_reclaim_check(hbp, hhdr, sz);
- } else {
- *flh = GC_reclaim_generic(hbp, hhdr, sz,
- (ok -> ok_init || GC_debugging_started),
- *flh MEM_FOUND_ADDR);
- }
-}
-
-/*
- * Restore an unmarked large object or an entirely empty blocks of small objects
- * to the heap block free list.
- * Otherwise enqueue the block for later processing
- * by GC_reclaim_small_nonempty_block.
- * If report_if_found is TRUE, then process any block immediately, and
- * simply report free objects; do not actually reclaim them.
- */
-# if defined(__STDC__) || defined(__cplusplus)
- void GC_reclaim_block(register struct hblk *hbp, word report_if_found)
-# else
- void GC_reclaim_block(hbp, report_if_found)
- register struct hblk *hbp; /* ptr to current heap block */
- word report_if_found; /* Abort if a reclaimable object is found */
-# endif
-{
- register hdr * hhdr;
- register word sz; /* size of objects in current block */
- register struct obj_kind * ok;
- struct hblk ** rlh;
-
- hhdr = HDR(hbp);
- sz = hhdr -> hb_sz;
- ok = &GC_obj_kinds[hhdr -> hb_obj_kind];
-
- if( sz > MAXOBJSZ ) { /* 1 big object */
- if( !mark_bit_from_hdr(hhdr, 0) ) {
- if (report_if_found) {
- FOUND_FREE(hbp, 0);
- } else {
- word blocks = OBJ_SZ_TO_BLOCKS(sz);
- if (blocks > 1) {
- GC_large_allocd_bytes -= blocks * HBLKSIZE;
- }
-# ifdef GATHERSTATS
- GC_mem_found += sz;
-# endif
- GC_freehblk(hbp);
- }
- }
- } else {
- GC_bool empty = GC_block_empty(hhdr);
- if (report_if_found) {
- GC_reclaim_small_nonempty_block(hbp, (int)report_if_found
- MEM_FOUND_ADDR);
- } else if (empty) {
-# ifdef GATHERSTATS
- GC_mem_found += BYTES_TO_WORDS(HBLKSIZE);
-# endif
- GC_freehblk(hbp);
- } else if (TRUE != GC_block_nearly_full(hhdr)){
- /* group of smaller objects, enqueue the real work */
- rlh = &(ok -> ok_reclaim_list[sz]);
- hhdr -> hb_next = *rlh;
- *rlh = hbp;
- } /* else not worth salvaging. */
- /* We used to do the nearly_full check later, but we */
- /* already have the right cache context here. Also */
- /* doing it here avoids some silly lock contention in */
- /* GC_malloc_many. */
- }
-}
-
-#if !defined(NO_DEBUGGING)
-/* Routines to gather and print heap block info */
-/* intended for debugging. Otherwise should be called */
-/* with lock. */
-
-struct Print_stats
-{
- size_t number_of_blocks;
- size_t total_bytes;
-};
-
-#ifdef USE_MARK_BYTES
-
-/* Return the number of set mark bits in the given header */
-int GC_n_set_marks(hhdr)
-hdr * hhdr;
-{
- register int result = 0;
- register int i;
-
- for (i = 0; i < MARK_BITS_SZ; i++) {
- result += hhdr -> hb_marks[i];
- }
- return(result);
-}
-
-#else
-
-/* Number of set bits in a word. Not performance critical. */
-static int set_bits(n)
-word n;
-{
- register word m = n;
- register int result = 0;
-
- while (m > 0) {
- if (m & 1) result++;
- m >>= 1;
- }
- return(result);
-}
-
-/* Return the number of set mark bits in the given header */
-int GC_n_set_marks(hhdr)
-hdr * hhdr;
-{
- register int result = 0;
- register int i;
-
- for (i = 0; i < MARK_BITS_SZ; i++) {
- result += set_bits(hhdr -> hb_marks[i]);
- }
- return(result);
-}
-
-#endif /* !USE_MARK_BYTES */
-
-/*ARGSUSED*/
-# if defined(__STDC__) || defined(__cplusplus)
- void GC_print_block_descr(struct hblk *h, word dummy)
-# else
- void GC_print_block_descr(h, dummy)
- struct hblk *h;
- word dummy;
-# endif
-{
- register hdr * hhdr = HDR(h);
- register size_t bytes = WORDS_TO_BYTES(hhdr -> hb_sz);
- struct Print_stats *ps;
-
- GC_printf3("(%lu:%lu,%lu)", (unsigned long)(hhdr -> hb_obj_kind),
- (unsigned long)bytes,
- (unsigned long)(GC_n_set_marks(hhdr)));
- bytes += HBLKSIZE-1;
- bytes &= ~(HBLKSIZE-1);
-
- ps = (struct Print_stats *)dummy;
- ps->total_bytes += bytes;
- ps->number_of_blocks++;
-}
-
-void GC_print_block_list()
-{
- struct Print_stats pstats;
-
- GC_printf0("(kind(0=ptrfree,1=normal,2=unc.,3=stubborn):size_in_bytes, #_marks_set)\n");
- pstats.number_of_blocks = 0;
- pstats.total_bytes = 0;
- GC_apply_to_all_blocks(GC_print_block_descr, (word)&pstats);
- GC_printf2("\nblocks = %lu, bytes = %lu\n",
- (unsigned long)pstats.number_of_blocks,
- (unsigned long)pstats.total_bytes);
-}
-
-#endif /* NO_DEBUGGING */
-
-/*
- * Clear all obj_link pointers in the list of free objects *flp.
- * Clear *flp.
- * This must be done before dropping a list of free gcj-style objects,
- * since may otherwise end up with dangling "descriptor" pointers.
- * It may help for other pointer-containg objects.
- */
-void GC_clear_fl_links(flp)
-ptr_t *flp;
-{
- ptr_t next = *flp;
-
- while (0 != next) {
- *flp = 0;
- flp = &(obj_link(next));
- next = *flp;
- }
-}
-
-/*
- * Perform GC_reclaim_block on the entire heap, after first clearing
- * small object free lists (if we are not just looking for leaks).
- */
-void GC_start_reclaim(report_if_found)
-int report_if_found; /* Abort if a GC_reclaimable object is found */
-{
- int kind;
-
-# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
- GC_ASSERT(0 == GC_fl_builder_count);
-# endif
- /* Clear reclaim- and free-lists */
- for (kind = 0; kind < GC_n_kinds; kind++) {
- ptr_t *fop;
- ptr_t *lim;
- struct hblk ** rlp;
- struct hblk ** rlim;
- struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
- GC_bool should_clobber = (GC_obj_kinds[kind].ok_descriptor != 0);
-
- if (rlist == 0) continue; /* This kind not used. */
- if (!report_if_found) {
- lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJSZ+1]);
- for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
- if (*fop != 0) {
- if (should_clobber) {
- GC_clear_fl_links(fop);
- } else {
- *fop = 0;
- }
- }
- }
- } /* otherwise free list objects are marked, */
- /* and its safe to leave them */
- rlim = rlist + MAXOBJSZ+1;
- for( rlp = rlist; rlp < rlim; rlp++ ) {
- *rlp = 0;
- }
- }
-
-# ifdef PRINTBLOCKS
- GC_printf0("GC_reclaim: current block sizes:\n");
- GC_print_block_list();
-# endif
-
- /* Go through all heap blocks (in hblklist) and reclaim unmarked objects */
- /* or enqueue the block for later processing. */
- GC_apply_to_all_blocks(GC_reclaim_block, (word)report_if_found);
-
-# ifdef EAGER_SWEEP
- /* This is a very stupid thing to do. We make it possible anyway, */
- /* so that you can convince yourself that it really is very stupid. */
- GC_reclaim_all((GC_stop_func)0, FALSE);
-# endif
-# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
- GC_ASSERT(0 == GC_fl_builder_count);
-# endif
-
-}
-
-/*
- * Sweep blocks of the indicated object size and kind until either the
- * appropriate free list is nonempty, or there are no more blocks to
- * sweep.
- */
-void GC_continue_reclaim(sz, kind)
-word sz; /* words */
-int kind;
-{
- register hdr * hhdr;
- register struct hblk * hbp;
- register struct obj_kind * ok = &(GC_obj_kinds[kind]);
- struct hblk ** rlh = ok -> ok_reclaim_list;
- ptr_t *flh = &(ok -> ok_freelist[sz]);
-
- if (rlh == 0) return; /* No blocks of this kind. */
- rlh += sz;
- while ((hbp = *rlh) != 0) {
- hhdr = HDR(hbp);
- *rlh = hhdr -> hb_next;
- GC_reclaim_small_nonempty_block(hbp, FALSE MEM_FOUND_ADDR);
- if (*flh != 0) break;
- }
-}
-
-/*
- * Reclaim all small blocks waiting to be reclaimed.
- * Abort and return FALSE when/if (*stop_func)() returns TRUE.
- * If this returns TRUE, then it's safe to restart the world
- * with incorrectly cleared mark bits.
- * If ignore_old is TRUE, then reclaim only blocks that have been
- * recently reclaimed, and discard the rest.
- * Stop_func may be 0.
- */
-GC_bool GC_reclaim_all(stop_func, ignore_old)
-GC_stop_func stop_func;
-GC_bool ignore_old;
-{
- register word sz;
- register int kind;
- register hdr * hhdr;
- register struct hblk * hbp;
- register struct obj_kind * ok;
- struct hblk ** rlp;
- struct hblk ** rlh;
-# ifdef PRINTTIMES
- CLOCK_TYPE start_time;
- CLOCK_TYPE done_time;
-
- GET_TIME(start_time);
-# endif
-
- for (kind = 0; kind < GC_n_kinds; kind++) {
- ok = &(GC_obj_kinds[kind]);
- rlp = ok -> ok_reclaim_list;
- if (rlp == 0) continue;
- for (sz = 1; sz <= MAXOBJSZ; sz++) {
- rlh = rlp + sz;
- while ((hbp = *rlh) != 0) {
- if (stop_func != (GC_stop_func)0 && (*stop_func)()) {
- return(FALSE);
- }
- hhdr = HDR(hbp);
- *rlh = hhdr -> hb_next;
- if (!ignore_old || hhdr -> hb_last_reclaimed == GC_gc_no - 1) {
- /* It's likely we'll need it this time, too */
- /* It's been touched recently, so this */
- /* shouldn't trigger paging. */
- GC_reclaim_small_nonempty_block(hbp, FALSE MEM_FOUND_ADDR);
- }
- }
- }
- }
-# ifdef PRINTTIMES
- GET_TIME(done_time);
- GC_printf1("Disposing of reclaim lists took %lu msecs\n",
- MS_TIME_DIFF(done_time,start_time));
-# endif
- return(TRUE);
-}
projects / msp430-gcc.git / blobdiff