While working on C++ support for wild matching, I noticed that
attaching to my system's Firefox (which uses .gdb_index), setting a
break at main and bailing, like:
$ gdb --batch -q -p `pidof firefox` -ex "b main"
would get substancially slower. It'd take around 20s when currently
it takes 3s.
The problem is that gdb would expand more symtabs than currently,
because Firefox has symbols named like "nsHtml5Atoms::main",
"nsGkAtoms::main", etc., which given wild matching, match.
However, these are not function symbols, [they're "(nsIAtom *)"], so
it seems silly that they'd cause expansion in the first place.
The .gdb_index code (dwarf2read.c:dw2_expand_marked_cus) filters out
symbols matches based on search_domain:
case VARIABLES_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
continue;
break;
case FUNCTIONS_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
continue;
break;
case TYPES_DOMAIN:
if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
continue;
break;
default:
break;
however, we're currently passing down search_domain::ALL_DOMAIN when
we know we're looking for functions, for no good reason. This patch
fixes that.
It seems like search_domain is underutilized throughout, but I'll
leave using it more for another pass.
gdb/ChangeLog:
2017-11-08 Pedro Alves <palves@redhat.com>
* linespec.c (iterate_over_all_matching_symtabs): Add
search_domain parameter. Pass it down to expand_symtabs_matching.
(decode_objc): Request FUNCTIONS_DOMAIN symbols only.
(lookup_prefix_sym): Adjust by passing ALL_DOMAIN as
search_domain.
(add_all_symbol_names_from_pspace): Add search_domain parameter.
Pass it down.
(find_method, find_function_symbols): Request FUNCTIONS_DOMAIN
symbols.
(add_matching_symbols_to_info): Add search_domain parameter. Pass
it down.
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| include | ||
| intl | ||
| ld | ||
| libdecnumber | ||
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| zlib | ||
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| compile | ||
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| configure | ||
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| ylwrap | ||
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.