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* [Bug symtab/25953] New: [debug-names] Support multiple per-CU indices
@ 2020-05-08 16:04 vries at gcc dot gnu.org
2020-05-08 16:07 ` [Bug symtab/25953] " vries at gcc dot gnu.org
2023-12-10 15:35 ` tromey at sourceware dot org
0 siblings, 2 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-08 16:04 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25953
Bug ID: 25953
Summary: [debug-names] Support multiple per-CU indices
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: symtab
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Consider the following two-file test-case:
...
$ cat main.c
extern void foo (void);
int
main (void)
{
foo ();
return 0;
}
$ cat foo.c
void
foo (void)
{
}
...
Compiled like this:
...
$ clang-10 main.c foo.c -gdwarf-5 -gpubnames
...
When running the exec with gdb, we have:
...
$ gdb -batch a.out
warning: Section .debug_names in /data/gdb_versions/devel/a.out length 112 does
not match section length 192, ignoring .debug_names.
...
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* [Bug symtab/25953] [debug-names] Support multiple per-CU indices
2020-05-08 16:04 [Bug symtab/25953] New: [debug-names] Support multiple per-CU indices vries at gcc dot gnu.org
@ 2020-05-08 16:07 ` vries at gcc dot gnu.org
2023-12-10 15:35 ` tromey at sourceware dot org
1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-08 16:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25953
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
The section contains two per-CU indices:
...
$ llvm-dwarfdump --all a.out
...
.debug_names contents:
Name Index @ 0x0 {
Header {
Length: 0x6C
Version: 5
Padding: 0x0
CU count: 1
Local TU count: 0
Foreign TU count: 0
Bucket count: 2
Name count: 2
Abbreviations table size: 0xD
Augmentation: 'LLVM0700'
}
Compilation Unit offsets [
CU[0]: 0x000000c7
]
Abbreviations [
Abbreviation 0x2e {
Tag: DW_TAG_subprogram
DW_IDX_die_offset: DW_FORM_ref4
}
Abbreviation 0x24 {
Tag: DW_TAG_base_type
DW_IDX_die_offset: DW_FORM_ref4
}
]
Bucket 0 [
Name 1 {
Hash: 0xB888030
String: 0x00000061 "int"
Entry @ 0x5d {
Abbrev: 0x24
Tag: DW_TAG_base_type
DW_IDX_die_offset: 0x00000032
}
}
Name 2 {
Hash: 0x7C9A7F6A
String: 0x0000020c "main"
Entry @ 0x66 {
Abbrev: 0x2E
Tag: DW_TAG_subprogram
DW_IDX_die_offset: 0x00000023
}
}
]
Bucket 1 [
EMPTY
]
}
Name Index @ 0x70 {
Header {
Length: 0x4C
Version: 5
Padding: 0x0
CU count: 1
Local TU count: 0
Foreign TU count: 0
Bucket count: 1
Name count: 1
Abbreviations table size: 0x7
Augmentation: 'LLVM0700'
}
Compilation Unit offsets [
CU[0]: 0x000000fe
]
Abbreviations [
Abbreviation 0x2e {
Tag: DW_TAG_subprogram
DW_IDX_die_offset: DW_FORM_ref4
}
]
Bucket 0 [
Name 1 {
Hash: 0xB887389
String: 0x00000217 "foo"
Entry @ 0xb7 {
Abbrev: 0x2E
Tag: DW_TAG_subprogram
DW_IDX_die_offset: 0x00000023
}
}
]
}
...
But gdb expects a single per-module index.
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* [Bug symtab/25953] [debug-names] Support multiple per-CU indices
2020-05-08 16:04 [Bug symtab/25953] New: [debug-names] Support multiple per-CU indices vries at gcc dot gnu.org
2020-05-08 16:07 ` [Bug symtab/25953] " vries at gcc dot gnu.org
@ 2023-12-10 15:35 ` tromey at sourceware dot org
1 sibling, 0 replies; 3+ messages in thread
From: tromey at sourceware dot org @ 2023-12-10 15:35 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=25953
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
FWIW the new .debug_names reader is going to producer-sniff
and ignore non-gdb indices. The reason for this is that both
old-style gdb and clang produce incorrect ones.
So while this is a bug, we won't need to fix it until there
is some producer that creates indices like this that we think
are correct enough to be read.
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2020-05-08 16:04 [Bug symtab/25953] New: [debug-names] Support multiple per-CU indices vries at gcc dot gnu.org
2020-05-08 16:07 ` [Bug symtab/25953] " vries at gcc dot gnu.org
2023-12-10 15:35 ` tromey at sourceware dot org
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