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* [binutils-gdb] Document GDB extensions to DWARF .debug_names
@ 2024-01-18 20:37 Tom Tromey
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From: Tom Tromey @ 2024-01-18 20:37 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=374807b60751a5f890005d16dd8b466b22185a3f
commit 374807b60751a5f890005d16dd8b466b22185a3f
Author: Tom Tromey <tom@tromey.com>
Date: Sun Dec 3 13:42:29 2023 -0700
Document GDB extensions to DWARF .debug_names
GDB's new .debug_names implementation uses some extensions. This
patch adds some documentation on this to the manual.
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Diff:
---
gdb/doc/gdb.texinfo | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 55ebf752435..e98c15242bc 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -21479,6 +21479,7 @@ program. To debug a core dump of a previous run, you must also tell
* Separate Debug Files:: Debugging information in separate files
* MiniDebugInfo:: Debugging information in a special section
* Index Files:: Index files speed up GDB
+* Debug Names:: Extensions to .debug_names
* Symbol Errors:: Errors reading symbol files
* Data Files:: GDB data files
@end menu
@@ -22682,6 +22683,44 @@ Print the number of cache hits and misses since the launch of @value{GDBN}.
@end table
+@node Debug Names
+@section Extensions to @samp{.debug_names}
+@cindex index files
+@cindex @samp{.debug_names} section
+
+The DWARF specification documents an optional index section called
+@samp{.debug_names}. @value{GDBN} can both read and create this
+section. However, in order to work with @value{GDBN}, some extensions
+were necessary.
+
+@value{GDBN} uses the augmentation string @samp{GDB2}. Earlier
+versions used the string @samp{GDB}, but these versions of the index
+are no longer supported.
+
+@value{GDBN} does not use the specified hash table. Therefore,
+because this hash table is optional, @value{GDBN} also does not write
+it.
+
+@value{GDBN} also generates and uses some extra index attributes:
+@table @code
+@item DW_IDX_GNU_internal
+This has the value @samp{0x2000}. It is a flag that, when set,
+indicates that the associated entry has @code{static} linkage.
+
+@item DW_IDX_GNU_main
+This has the value @samp{0x2002}. It is a flag that, when set,
+indicates that the associated entry is the program's @code{main}.
+
+@item DW_IDX_GNU_language
+This has the value @samp{0x2003}. It is @samp{DW_LANG_} constant,
+indicating the language of the associated entry.
+
+@item DW_IDX_GNU_linkage_name
+This has the value @samp{0x2004}. It is a flag that, when set,
+indicates that the associated entry is a linkage name, and not a
+source name.
+@end table
+
@node Symbol Errors
@section Errors Reading Symbol Files
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