diff options
Diffstat (limited to 'src/pdumper.c')
| -rw-r--r-- | src/pdumper.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/src/pdumper.c b/src/pdumper.c index bc41afc7c5a..217ffa67839 100644 --- a/src/pdumper.c +++ b/src/pdumper.c @@ -4802,14 +4802,19 @@ struct dump_bitset }; static bool -dump_bitset_init (struct dump_bitset *bitset, size_t number_bits) +dump_bitsets_init (struct dump_bitset bitset[2], size_t number_bits) { - int xword_size = sizeof (bitset->bits[0]); + int xword_size = sizeof (bitset[0].bits[0]); int bits_per_word = xword_size * CHAR_BIT; ptrdiff_t words_needed = divide_round_up (number_bits, bits_per_word); - bitset->number_words = words_needed; - bitset->bits = calloc (words_needed, xword_size); - return bitset->bits != NULL; + dump_bitset_word *bits = calloc (words_needed, 2 * xword_size); + if (!bits) + return false; + bitset[0].bits = bits; + bitset[0].number_words = bitset[1].number_words = words_needed; + bitset[1].bits = memset (bits + words_needed, UCHAR_MAX, + words_needed * xword_size); + return true; } static dump_bitset_word * @@ -4870,7 +4875,7 @@ struct pdumper_loaded_dump_private /* Copy of the header we read from the dump. */ struct dump_header header; /* Mark bits for objects in the dump; used during GC. */ - struct dump_bitset mark_bits; + struct dump_bitset mark_bits, last_mark_bits; /* Time taken to load the dump. */ double load_time; /* Dump file name. */ @@ -4993,6 +4998,10 @@ pdumper_find_object_type_impl (const void *obj) dump_off offset = ptrdiff_t_to_dump_off ((uintptr_t) obj - dump_public.start); if (offset % DUMP_ALIGNMENT != 0) return PDUMPER_NO_OBJECT; + ptrdiff_t bitno = offset / DUMP_ALIGNMENT; + if (offset < dump_private.header.discardable_start + && !dump_bitset_bit_set_p (&dump_private.last_mark_bits, bitno)) + return PDUMPER_NO_OBJECT; const struct dump_reloc *reloc = dump_find_relocation (&dump_private.header.object_starts, offset); return (reloc != NULL && dump_reloc_get_offset (*reloc) == offset) @@ -5021,12 +5030,16 @@ pdumper_set_marked_impl (const void *obj) eassert (offset < dump_private.header.cold_start); eassert (offset < dump_private.header.discardable_start); ptrdiff_t bitno = offset / DUMP_ALIGNMENT; + eassert (dump_bitset_bit_set_p (&dump_private.last_mark_bits, bitno)); dump_bitset_set_bit (&dump_private.mark_bits, bitno); } void pdumper_clear_marks_impl (void) { + dump_bitset_word *swap = dump_private.last_mark_bits.bits; + dump_private.last_mark_bits.bits = dump_private.mark_bits.bits; + dump_private.mark_bits.bits = swap; dump_bitset_clear (&dump_private.mark_bits); } @@ -5243,7 +5256,7 @@ pdumper_load (const char *dump_filename) int dump_page_size; dump_off adj_discardable_start; - struct dump_bitset mark_bits; + struct dump_bitset mark_bits[2]; size_t mark_bits_needed; struct dump_header header_buf = { 0 }; @@ -5357,7 +5370,7 @@ pdumper_load (const char *dump_filename) err = PDUMPER_LOAD_ERROR; mark_bits_needed = divide_round_up (header->discardable_start, DUMP_ALIGNMENT); - if (!dump_bitset_init (&mark_bits, mark_bits_needed)) + if (!dump_bitsets_init (mark_bits, mark_bits_needed)) goto out; /* Point of no return. */ @@ -5365,7 +5378,8 @@ pdumper_load (const char *dump_filename) dump_base = (uintptr_t) sections[DS_HOT].mapping; gflags.dumped_with_pdumper_ = true; dump_private.header = *header; - dump_private.mark_bits = mark_bits; + dump_private.mark_bits = mark_bits[0]; + dump_private.last_mark_bits = mark_bits[1]; dump_public.start = dump_base; dump_public.end = dump_public.start + dump_size; |