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* [binutils-gdb] Update skip_one_die for new abbrev properties
@ 2022-04-12 15:40 Tom Tromey
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From: Tom Tromey @ 2022-04-12 15:40 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a2f0ab9310cb2ff235b436e0492fbaa804ce1bc9
commit a2f0ab9310cb2ff235b436e0492fbaa804ce1bc9
Author: Tom Tromey <tom@tromey.com>
Date: Sat Mar 13 14:55:13 2021 -0700
Update skip_one_die for new abbrev properties
This updates skip_one_die to speed it up in the cases where either
sibling_offset or size_if_constant are set.
Diff:
---
gdb/dwarf2/read.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 29e1f098d27..0c7a4de7c7d 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -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. */
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2022-04-12 15:40 [binutils-gdb] Update skip_one_die for new abbrev properties Tom Tromey
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