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Update skip_one_die for new abbrev properties

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This updates skip_one_die to speed it up in the cases where either
sibling_offset or size_if_constant are set.
This commit is contained in:
Tom Tromey
2021-03-13 14:55:13 -07:00
parent 696eef26e0
commit a2f0ab9310
1 changed files with 18 additions and 0 deletions
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18
gdb/dwarf2/read.c
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@@ -8393,6 +8393,24 @@ skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
const gdb_byte *buffer_end = reader->buffer_end;
unsigned int form, i;
if (do_skip_children && abbrev->sibling_offset != (unsigned short) -1)
{
/* We only handle DW_FORM_ref4 here. */
const gdb_byte *sibling_data = info_ptr + abbrev->sibling_offset;
unsigned int offset = read_4_bytes (abfd, sibling_data);
const gdb_byte *sibling_ptr = buffer + offset;
if (sibling_ptr >= info_ptr && sibling_ptr < reader->buffer_end)
return sibling_ptr;
/* Fall through to the slow way. */
}
else if (abbrev->size_if_constant != 0)
{
info_ptr += abbrev->size_if_constant;
if (do_skip_children && abbrev->has_children)
return skip_children (reader, info_ptr);
return info_ptr;
}
for (i = 0; i < abbrev->num_attrs; i++)
{
/* The only abbrev we care about is DW_AT_sibling. */