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Improve performance for C++ symbols expansion (Tom Tromey, BZ 787487). 

- Install also gdb-gdb.py pretty printers.
This commit is contained in:
Jan Kratochvil 2012-02-09 22:25:44 +01:00
parent a50d5b63a7
commit 3000de323b
2 changed files with 60 additions and 2 deletions
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46
gdb-expand-cxx-accel.patch Normal file
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@ -0,0 +1,46 @@
https://bugzilla.redhat.com/show_bug.cgi?id=787487
http://sourceware.org/ml/gdb-patches/2012-02/msg00112.html
Subject: RFC: extend symtabs_from_filename skipping for C++
I'd appreciate comments on this. Barring comments I will check it in
after a couple days.
A while ago Doug committed a patch to change linespec to skip
symtabs_from_filename when possible. This was an important performance
improvement.
We got a bug report in Red Hat bugzilla asking that this be extended to
C++ qualified names:
https://bugzilla.redhat.com/show_bug.cgi?id=787487
This patch implements this idea.
Built and regtested on x86-64 Fedora 15.
Tom
2012-02-08 Tom Tromey <tromey@redhat.com>
* linespec.c (decode_line_internal): Skip symtabs_from_filename
when we have a C++ qualified name.
diff --git a/gdb/linespec.c b/gdb/linespec.c
index da88d17..3f53b8e 100644
--- a/gdb/linespec.c
+++ b/gdb/linespec.c
@@ -912,9 +912,11 @@ decode_line_internal (struct linespec_state *self, char **argptr)
/* First things first: if ARGPTR starts with a filename, get its
symtab and strip the filename from ARGPTR.
Avoid calling symtab_from_filename if we know can,
- it can be expensive. */
+ it can be expensive. We know we can avoid the call if we see a
+ single word (e.g., "break NAME") or if we see a qualified C++
+ name ("break QUAL::NAME"). */
- if (*p != '\0')
+ if (*p != '\0' && p[1] != ':')
{
TRY_CATCH (file_exception, RETURN_MASK_ERROR)
{

16
gdb.spec
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@ -28,7 +28,7 @@ Version: 7.4.50.%{snap}
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 11%{?_with_upstream:.upstream}%{?dist}
Release: 12%{?_with_upstream:.upstream}%{?dist}
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain
Group: Development/Debuggers
@ -532,6 +532,10 @@ Patch642: gdb-readline62-ask-more-rh.patch
#=push
Patch643: gdb-python-rdynamic.patch
# Improve performance for C++ symbols expansion (Tom Tromey, BZ 787487).
#=push
Patch644: gdb-expand-cxx-accel.patch
%if 0%{!?rhel:1} || 0%{?rhel} > 6
# RL_STATE_FEDORA_GDB would not be found for:
# Patch642: gdb-readline62-ask-more-rh.patch
@ -797,6 +801,7 @@ rm -f gdb/jv-exp.c gdb/m2-exp.c gdb/objc-exp.c gdb/p-exp.c
%patch627 -p1
%patch634 -p1
%patch643 -p1
%patch644 -p1
%patch393 -p1
%patch335 -p1
@ -1103,6 +1108,9 @@ do
touch -r $RPM_BUILD_DIR/%{gdb_src}/gdb/ChangeLog $i
done
mkdir -p $RPM_BUILD_ROOT/usr/lib/debug%{_bindir}
cp -p $RPM_BUILD_DIR/%{gdb_src}/gdb/gdb-gdb.py $RPM_BUILD_ROOT/usr/lib/debug%{_bindir}/
%if 0%{?rhel:1} && 0%{?rhel} <= 6
%if 0%{!?_without_python:1}
# Temporarily now:
@ -1232,8 +1240,12 @@ fi
%{_infodir}/gdb.info*
%changelog
* Thu Feb 9 2012 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.4.50.20120120-12.fc17
- Improve performance for C++ symbols expansion (Tom Tromey, BZ 787487).
- Install also gdb-gdb.py pretty printers.
* Thu Feb 9 2012 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.4.50.20120120-11.fc17
- Fix possible NULL crash in find_charset_names (Trom Tromey, BZ 786091).
- Fix possible NULL crash in find_charset_names (Tom Tromey, BZ 786091).
- [ppc*] Fix build failure due to GCC aliasing warning (BZ 786504).
* Sat Jan 21 2012 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.4.50.20120120-10.fc17