This commit changes the language_data::la_get_symbol_name_matcher
function pointer member variable into a member function of
language_defn.
There should be no user visible changes after this commit.
Before this commit access to the la_get_symbol_name_matcher function
pointer was through the get_symbol_name_matcher function, which looked
something like this (is pseudo-code):
<return-type>
get_symbol_name_matcher (language_defn *lang, <other args>)
{
if (current_language == ada)
current_language->la_get_symbol_name_matcher (<other args>);
else
lang->la_get_symbol_name_matcher (<other args>);
}
In this commit I moved the get_symbol_name_matcher as a non-virtual
function in the language_defn base class, I then add a new virtual
method that is only used from within get_symbol_name_matcher, this can
then be overridden by specific languages as needed. So we now have:
class language_defn
{
<return-type> get_symbol_name_matcher (<args>)
{
if (current_language == ada)
return current_language->get_symbol_name_matcher_inner (<args>);
else
return this->get_symbol_name_matcher_inner (<args>);
}
virtual <return-type> get_symbol_name_matcher_inner (<args>)
{
....
}
}
gdb/ChangeLog:
* ada-lang.c (ada_get_symbol_name_matcher): Update header comment.
(ada_language_data): Delete la_get_symbol_name_matcher
initializer.
(language_defn::get_symbol_name_matcher_inner): New member
function.
* c-lang.c (c_language_data): Delete la_get_symbol_name_matcher
initializer.
(cplus_language_data): Likewise.
(cplus_language::get_symbol_name_matcher_inner): New member
function.
(asm_language_data): Delete la_get_symbol_name_matcher initializer.
(minimal_language_data): Likewise.
* cp-support.h (cp_get_symbol_name_matcher): Update header comment.
* d-lang.c (d_language_data): Delete la_get_symbol_name_matcher
initializer.
* dictionary.c (iter_match_first_hashed): Update call to
get_symbol_name_matcher.
(iter_match_next_hashed): Likewise.
(iter_match_next_linear): Likewise.
* dwarf2/read.c (dw2_expand_symtabs_matching_symbol): Likewise.
* f-lang.c (f_language_data): Delete la_get_symbol_name_matcher
initializer.
(f_language::get_symbol_name_matcher_inner): New member function.
* go-lang.c (go_language_data): Delete la_get_symbol_name_matcher
initializer.
* language.c (default_symbol_name_matcher): Update header comment,
make static.
(language_defn::get_symbol_name_matcher): New definition.
(language_defn::get_symbol_name_matcher_inner): Likewise.
(get_symbol_name_matcher): Delete.
(unknown_language_data): Delete la_get_symbol_name_matcher
initializer.
(auto_language_data): Likewise.
* language.h (language_data): Delete la_get_symbol_name_matcher
field.
(language_defn::get_symbol_name_matcher): New member function.
(language_defn::get_symbol_name_matcher_inner): Likewise.
(default_symbol_name_matcher): Delete declaration.
* linespec.c (find_methods): Update call to
get_symbol_name_matcher.
* m2-lang.c (m2_language_data): Delete la_get_symbol_name_matcher
initializer.
* minsyms.c (lookup_minimal_symbol): Update call to
get_symbol_name_matcher.
(iterate_over_minimal_symbols): Likewise.
* objc-lang.c (objc_language_data): Delete
la_get_symbol_name_matcher initializer.
* opencl-lang.c (opencl_language_data): Likewise.
* p-lang.c (pascal_language_data): Likewise.
* psymtab.c (psymbol_name_matches): Update call to
get_symbol_name_matcher.
* rust-lang.c (rust_language_data): Delete
la_get_symbol_name_matcher initializer.
* symtab.c (symbol_matches_search_name): Update call to
get_symbol_name_matcher.
(compare_symbol_name): Likewise.
These functions are not used in the code base, remove them.
gdb/ChangeLog:
* dictionary.c (dict_empty, mdict_empty): Remove.
* dictionary.c (mdict_empty): Remove.
Change-Id: I4c1b08c730f6790b2f3d28b680607618e3c08e48
I touched symtab.h and was surprised to see how many files were
rebuilt. I looked into it a bit, and found that defs.h includes
gdbarch.h, which in turn includes many things.
gdbarch.h is only needed by a minority ofthe files in gdb, so this
patch removes the include from defs.h and updates the fallout.
I did "wc -l" on the files in build/gdb/.deps; this patch reduces the
line count from 139935 to 137030; so there are definitely future
build-time savings here.
Note that while I configured with --enable-targets=all, it's possible
that some *-nat.c file needs an update. I could not test all of
these. The buildbot caught a few problems along these lines.
gdb/ChangeLog
2019-07-10 Tom Tromey <tom@tromey.com>
* defs.h: Don't include gdbarch.h.
* aarch64-ravenscar-thread.c, aarch64-tdep.c, alpha-bsd-tdep.h,
alpha-linux-tdep.c, alpha-mdebug-tdep.c, arch-utils.h, arm-tdep.h,
ax-general.c, btrace.c, buildsym-legacy.c, buildsym.h, c-lang.c,
cli/cli-decode.h, cli/cli-dump.c, cli/cli-script.h,
cli/cli-style.h, coff-pe-read.h, compile/compile-c-support.c,
compile/compile-cplus.h, compile/compile-loc2c.c, corefile.c,
cp-valprint.c, cris-linux-tdep.c, ctf.c, d-lang.c, d-namespace.c,
dcache.c, dicos-tdep.c, dictionary.c, disasm-selftests.c,
dummy-frame.c, dummy-frame.h, dwarf2-frame-tailcall.c,
dwarf2expr.c, expression.h, f-lang.c, frame-base.c,
frame-unwind.c, frv-linux-tdep.c, gdbarch-selftests.c, gdbtypes.h,
go-lang.c, hppa-nbsd-tdep.c, hppa-obsd-tdep.c, i386-dicos-tdep.c,
i386-tdep.h, ia64-vms-tdep.c, interps.h, language.c,
linux-record.c, location.h, m2-lang.c, m32r-linux-tdep.c,
mem-break.c, memattr.c, mn10300-linux-tdep.c, nios2-linux-tdep.c,
objfiles.h, opencl-lang.c, or1k-linux-tdep.c, p-lang.c,
parser-defs.h, ppc-tdep.h, probe.h, python/py-record-btrace.c,
record-btrace.c, record.h, regcache-dump.c, regcache.h,
riscv-fbsd-tdep.c, riscv-linux-tdep.c, rust-exp.y,
sh-linux-tdep.c, sh-nbsd-tdep.c, source-cache.c,
sparc-nbsd-tdep.c, sparc-obsd-tdep.c, sparc-ravenscar-thread.c,
sparc64-fbsd-tdep.c, std-regs.c, target-descriptions.h,
target-float.c, tic6x-linux-tdep.c, tilegx-linux-tdep.c, top.c,
tracefile.c, trad-frame.c, type-stack.h, ui-style.c, utils.c,
utils.h, valarith.c, valprint.c, varobj.c, x86-tdep.c,
xml-support.h, xtensa-linux-tdep.c, cli/cli-cmds.h: Update.
* s390-linux-nat.c, procfs.c, inf-ptrace.c: Likewise.
Some versions of gcc have a bug that causes
for (struct mumble : something)
... to give a compiler error. We routinely work around this bug in
gdb, but apparently had not done so in a while. This patch fixes the
remaining known cases of this problem.
gdb/ChangeLog
2019-05-03 Sandra Loosemore <sandra@codesourcery.com>
Tom Tromey <tom@tromey.com>
* dictionary.c (collate_pending_symbols_by_language): Remove
"struct" from foreach.
* symtab.c (lookup_global_symbol_from_objfile)
(lookup_symbol_in_objfile_from_linkage_name): Remove "struct" from
foreach.
* ser-tcp.c (net_open): Remove "struct" from foreach.
* objfiles.c (objfile_relocate, objfile_rebase)
(objfile_has_symbols): Remove "struct" from foreach.
* minsyms.c (lookup_minimal_symbol_by_pc_section): Remove "struct"
from foreach.
* dwarf2read.c (handle_struct_member_die): Remove "struct" from
foreach.
* darwin-nat.c (thread_info_from_private_thread_info): Remove
"struct" from foreach.
* ada-lang.c (create_excep_cond_exprs)
(ada_exception_catchpoint_cond_string): Remove "struct" from
foreach.
Now that multidictionary's are being used, there is no longer any need
to retain the four temporary functions introduced in the beginning of
this series.
This patch removes them.
As an additional cleanup, since the single-language dictionaries are
no longer used outside dictionary.c, make all of those functions
static.
gdb/ChangeLog:
PR gdb/23712
PR symtab/23010
* dictionary.c (pending_to_vector): Remove.
(dict_create_hashed_1, dict_create_linear_1, dict_add_pending_1):
Remove _1 suffix, replacing functions of the same name. Update
all callers.
(dict_create_hashed, dict_create_hashed_expandable)
(dict_create_linear, dict_create_linear_expandable, dict_free)
(dict_add_symbol, dict_add_pending, dict_size, dict_empty):
Make functions static.
gdb/23712 is a new manifestation of the now-infamous (at least to me)
symtab/23010 assertion failure (DICT_LANGUAGE == SYMBOL_LANGAUGE).
An example of the problem (using test case from symtab/23010):
Reading symbols from /home/rdiez/rdiez/arduino/JtagDue/BuildOutput/JtagDue-obj-release/firmware.elf...done.
(gdb) p SysTick_Handler
dwarf2read.c:9715: internal-error: void dw2_add_symbol_to_list(symbol*, pending**): Assertion `(*listhead) == NULL || (SYMBOL_LANGUAGE ((*listhead)->symbol[0]) == SYMBOL_LANGUAGE (symbol))' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)
This assertion was added specifically to catch this condition (of adding
symbols of different languages to a single pending list).
The problems we're now seeing on systems utilizing DWARF debugging seem to
be caused by the use of LTO, which adds a CU with an artificial DIE of
language C99 which references DIEs in other CUs of language C++.
Thus, we create a dictionary containing symbols of C99 but end up
stuffing C++ symbols into it, and the dw2_add_symbol_to_list triggers.
The approach taken here to fix this is to introduce multi-language
dictionaries to "replace" the standard, single-language dictionaries
used today.
Note to reviewers: This patch introduces some temporary functions to
aide with review. This and other artifacts (such as "See dictionary.h"
which appear incorrect) will all be valid at the end of the series.
This first patch introduces the new multidictionary and its API (which
is, by design, identical to the old dictionary interface). It also
mutates dict_create_hashed and dict_create_linear so that they take
a std::vector instead of the usual struct pending linked list. This will
be needed later on.
This patch does /not/ actually enable multidictionary's. That is left
for a subsequent patch in the series.
I've done exhaustive performance testing with this approach, and I've
attempted to minimize the overhead for the (overwhelmingly) most common
one-language scenario.
On average, a -g3 -O0 GDB (the one we developers use) will see
approximately a 4% slowdown when initially reading symbols. [I've
tested only GDB and firefox with -readnow.] When using -O2, this
difference shrinks to ~0.5%. Since a number of runs with these
patches actually run /faster/ than unpatched GDB, I conclude that
these tests have at least a 0.5% error margin.
On our own gdb.perf test suite, again, results appear to be pretty
negligible. Differences to unpatched GDB range from -7.8% (yes,
patched version is again faster than unpatched) to 27%. All tests
lying outside "negligible," such as the 27% slowdown, involve a total
run time of 0.0007 (or less) with smaller numbers of CUs/DSOs (usually 10
or 100). In all cases, the follow-up tests with more CUs/DSOs is never
more than 3% difference to the baseline, unpatched GDB.
In my opinion, these results are satisfactory.
gdb/ChangeLog:
PR gdb/23712
PR symtab/23010
* dictionary.c: Include unordered_map.
(pending_to_vector): New function.
(dict_create_hashed_1, dict_create_linear_1, dict_add_pending_1):
Rewrite the non-"_1" functions to take vector instead
of linked list.
(dict_create_hashed, dict_create_linear, dict_add_pending): Use the
"new" _1 versions of the same name.
(multidictionary): Define.
(std::hash<enum language): New definition.
(collate_pending_symbols_by_language, mdict_create_hashed)
(mdict_create_hashed_expandable, mdict_create_linear)
(mdict_create_linear_expandable, mdict_free)
(find_language_dictionary, create_new_language_dictionary)
(mdict_add_symbol, mdict_add_pending, mdict_iterator_first)
(mdict_iterator_next, mdict_iter_match_first, mdict_iter_match_next)
(mdict_size, mdict_empty): New functions.
* dictionary.h (mdict_iterator): Define.
This commit applies all changes made after running the gdb/copyright.py
script.
Note that one file was flagged by the script, due to an invalid
copyright header
(gdb/unittests/basic_string_view/element_access/char/empty.cc).
As the file was copied from GCC's libstdc++-v3 testsuite, this commit
leaves this file untouched for the time being; a patch to fix the header
was sent to gcc-patches first.
gdb/ChangeLog:
Update copyright year range in all GDB files.
Rename language_get_symbol_name_matcher -> get_symbol_name_matcher,
since the function is no longer a straight "language method".
gdb/ChangeLog:
2018-01-10 Pedro Alves <palves@redhat.com>
* language.h (language_get_symbol_name_matcher): Rename ...
(get_symbol_name_matcher): ... this.
* language.c (language_get_symbol_name_matcher): Ditto.
* dictionary.c, linespec.c, minsyms.c, psymtab.c, symtab.c: All
callers adjusted.
The support for setting breakpoint in functions with ABI tags patch
will add a use of SYMBOL_HASH_NEXT in cp-support.c, which fails to
compile with:
src/gdb/cp-support.c:38:0:
src/gdb/cp-support.c: In function ‘unsigned int cp_search_name_hash(const char*)’:
src/gdb/../include/safe-ctype.h:148:20: error: ‘do_not_use_tolower_with_safe_ctype’ was not declared in this scope
#define tolower(c) do_not_use_tolower_with_safe_ctype
^
src/gdb/minsyms.h:174:18: note: in expansion of macro ‘tolower’
((hash) * 67 + tolower ((unsigned char) (c)) - 113)
^
src/gdb/cp-support.c:1677:14: note: in expansion of macro ‘SYMBOL_HASH_NEXT’
hash = SYMBOL_HASH_NEXT (hash, *string);
^
This fixes the problem before it happens.
I was somewhat worried about whether this might have an impact with
languages that are case insensitive, but I convinced myself that it
doesn't. As bonus, this improves GDB's minsym interning performance a
bit (3%-10%). See
<https://sourceware.org/ml/gdb/2017-11/msg00021.html>.
gdb/ChangeLog:
2017-11-25 Pedro Alves <palves@redhat.com>
* dictionary.c: Include "safe-ctype.h".
* minsyms.c: Include "safe-ctype.h".
* minsyms.c (SYMBOL_HASH_NEXT): Use TOLOWER instead of tolower.
This speeds up dict_hash a bit, by moving the "TKB" check into the
switch in the loop.
For "gdb -nx -readnow -batch gdb", this improves the time from ~9.8s
before to ~8.5s afterward.
gdb/ChangeLog
2017-11-09 Tom Tromey <tom@tromey.com>
* dictionary.c (dict_hash): Move "TKB" check into the "switch".
Summary:
- This is preparation for supporting wild name matching on C++ too.
- This is also preparation for TAB-completion fixes.
- Makes symbol name matching (think strcmp_iw) be based on a per-language method.
- Merges completion and non-completion name comparison (think
language_ops::la_get_symbol_name_cmp generalized).
- Avoid re-hashing lookup name multiple times
- Centralizes preparing a name for lookup (Ada name encoding / C++ Demangling),
both completion and non-completion.
- Fixes Ada latent bug with verbatim name matches in expressions
- Makes ada-lang.c use common|symtab.c completion code a bit more.
Ada's wild matching basically means that
"(gdb) break foo"
will find all methods named "foo" in all packages. Translating to
C++, it's roughly the same as saying that "break klass::method" sets
breakpoints on all "klass::method" methods of all classes, no matter
the namespace. A following patch will teach GDB about fullname vs
wild matching for C++ too. This patch is preparatory work to get
there.
Another idea here is to do symbol name matching based on the symbol
language's algorithm. I.e., avoid dependency on current language set.
This allows for example doing
(gdb) b foo::bar< int > (<tab>
and having gdb name match the C++ symbols correctly even if the
current language is C or Assembly (or Rust, or Ada, or ...), which can
easily happen if you step into an Assembly/C runtime library frame.
By encapsulating all the information related to a lookup name in a
class, we can also cache hash computation for a given language in the
lookup name object, to avoid recomputing it over and over.
Similarly, because we don't really know upfront which languages the
lookup name will be matched against, for each language we store the
lookup name transformed into a search name. E.g., for C++, that means
demangling the name. But for Ada, it means encoding the name. This
actually forces us to centralize all the different lookup name
encoding in a central place, resulting in clearer code, IMO. See
e.g., the new ada_lookup_name_info class.
The lookup name -> symbol search name computation is also done only
once per language.
The old language->la_get_symbol_name_cmp / symbol_name_cmp_ftype are
generalized to work with both completion, and normal symbol look up.
At some point early on, I had separate completion vs non-completion
language vector entry points, but a single method ends up being better
IMO for simplifying things -- the more we merge the completion /
non-completion name lookup code paths, the less changes for bugs
causing completion vs normal lookup finding different symbols.
The ada-lex.l change is necessary because when doing
(gdb) p <UpperCase>
then the name that is passed to write_ write_var_or_type ->
ada_lookup_symbol_list misses the "<>", i.e., it's just "UpperCase",
and we end up doing a wild match against "UpperCase" lowercased by
ada_lookup_name_info's constructor. I.e., "uppercase" wouldn't ever
match "UpperCase", and the symbol lookup fails.
This wouldn't cause any regression in the testsuite, but I added a new
test that would pass before the patch and fail after, if it weren't
for that fix.
This is latent bug that happens to go unnoticed because that
particular path was inconsistent with the rest of Ada symbol lookup by
not lowercasing the lookup name.
Ada's symbol_completion_add is deleted, replaced by using common
code's completion_list_add_name. To make the latter work for Ada, we
needed to add a new output parameter, because Ada wants to return back
a custom completion candidates that are not the symbol name.
With this patch, minimal symbol demangled name hashing is made
consistent with regular symbol hashing. I.e., it now goes via the
language vector's search_name_hash method too, as I had suggested in a
previous patch.
dw2_expand_symtabs_matching / .gdb_index symbol names were a
challenge. The problem is that we have no way to telling what is the
language of each symbol name found in the index, until we expand the
corresponding full symbol, which is off course what we're trying to
avoid. Language information is simply not considered in the index
format... Since the symbol name hashing and comparison routines are
per-language, we now have a problem. The patch sorts this out by
matching each name against all languages. This is inneficient, and
indeed slows down completion several times. E.g., with:
$ cat script.cmd
set pagination off
set $count = 0
while $count < 400
complete b string_prin
printf "count = %d\n", $count
set $count = $count + 1
end
$ time gdb --batch -q ./gdb-with-index -ex "source script-string_printf.cmd"
I get, before patch (-O2, x86-64):
real 0m1.773s
user 0m1.737s
sys 0m0.040s
While after patch (-O2, x86-64):
real 0m9.843s
user 0m9.482s
sys 0m0.034s
However, the following patch will optimize this, and will actually
make this use case faster compared to the "before patch" above:
real 0m1.321s
user 0m1.285s
sys 0m0.039s
gdb/ChangeLog:
2017-11-08 Pedro Alves <palves@redhat.com>
* ada-lang.c (ada_encode): Rename to ..
(ada_encode_1): ... this. Add throw_errors parameter and handle
it.
(ada_encode): Reimplement.
(match_name): Delete, folded into full_name.
(resolve_subexp): No longer pass the encoded name to
ada_lookup_symbol_list.
(should_use_wild_match): Delete.
(name_match_type_from_name): New.
(ada_lookup_simple_minsym): Use lookup_name_info and the
language's symbol_name_matcher_ftype.
(add_symbols_from_enclosing_procs, ada_add_local_symbols)
(ada_add_block_renamings): Adjust to use lookup_name_info.
(ada_lookup_name): New.
(add_nonlocal_symbols, ada_add_all_symbols)
(ada_lookup_symbol_list_worker, ada_lookup_symbol_list)
(ada_iterate_over_symbols): Adjust to use lookup_name_info.
(ada_name_for_lookup): Delete.
(ada_lookup_encoded_symbol): Construct a verbatim name.
(wild_match): Reverse sense of return type. Use bool.
(full_match): Reverse sense of return type. Inline bits of old
match_name here.
(ada_add_block_symbols): Adjust to use lookup_name_info.
(symbol_completion_match): Delete, folded into...
(ada_lookup_name_info::matches): ... .this new method.
(symbol_completion_add): Delete.
(ada_collect_symbol_completion_matches): Add name_match_type
parameter. Adjust to use lookup_name_info and
completion_list_add_name.
(get_var_value, ada_add_global_exceptions): Adjust to use
lookup_name_info.
(ada_get_symbol_name_cmp): Delete.
(do_wild_match, do_full_match): New functions.
(ada_lookup_name_info::ada_lookup_name_info): New method.
(ada_symbol_name_matches, ada_get_symbol_name_matcher): New
functions.
(ada_language_defn): Install ada_get_symbol_name_matcher.
* ada-lex.l (processId): If name starts with '<', copy it
verbatim.
* block.c (block_iter_match_step, block_iter_match_first)
(block_iter_match_next, block_lookup_symbol)
(block_lookup_symbol_primary, block_find_symbol): Adjust to use
lookup_name_info.
* block.h (block_iter_match_first, block_iter_match_next)
(ALL_BLOCK_SYMBOLS_WITH_NAME): Adjust to use lookup_name_info.
* c-lang.c (c_language_defn, cplus_language_defn)
(asm_language_defn, minimal_language_defn): Adjust comments to
refer to la_get_symbol_name_matcher.
* completer.c (complete_files_symbols)
(collect_explicit_location_matches, symbol_completer): Pass a
symbol_name_match_type down.
* completer.h (class completion_match, completion_match_result):
New classes.
(completion_tracker::reset_completion_match_result): New method.
(completion_tracker::m_completion_match_result): New field.
* cp-support.c (make_symbol_overload_list_block): Adjust to use
lookup_name_info.
(cp_fq_symbol_name_matches, cp_get_symbol_name_matcher): New
functions.
* cp-support.h (cp_get_symbol_name_matcher): New declaration.
* d-lang.c: Adjust comments to refer to
la_get_symbol_name_matcher.
* dictionary.c (dict_vector) <iter_match_first, iter_match_next>:
Adjust to use lookup_name_info.
(dict_iter_match_first, dict_iter_match_next)
(iter_match_first_hashed, iter_match_next_hashed)
(iter_match_first_linear, iter_match_next_linear): Adjust to work
with a lookup_name_info.
* dictionary.h (dict_iter_match_first, dict_iter_match_next):
Likewise.
* dwarf2read.c (dw2_lookup_symbol): Adjust to use lookup_name_info.
(dw2_map_matching_symbols): Adjust to use symbol_name_match_type.
(gdb_index_symbol_name_matcher): New class.
(dw2_expand_symtabs_matching) Adjust to use lookup_name_info and
gdb_index_symbol_name_matcher. Accept a NULL symbol_matcher.
* f-lang.c (f_collect_symbol_completion_matches): Adjust to work
with a symbol_name_match_type.
(f_language_defn): Adjust comments to refer to
la_get_symbol_name_matcher.
* go-lang.c (go_language_defn): Adjust comments to refer to
la_get_symbol_name_matcher.
* language.c (default_symbol_name_matcher)
(language_get_symbol_name_matcher): New functions.
(unknown_language_defn, auto_language_defn): Adjust comments to
refer to la_get_symbol_name_matcher.
* language.h (symbol_name_cmp_ftype): Delete.
(language_defn) <la_collect_symbol_completion_matches>: Add match
type parameter.
<la_get_symbol_name_cmp>: Delete field.
<la_get_symbol_name_matcher>: New field.
<la_iterate_over_symbols>: Adjust to use lookup_name_info.
(default_symbol_name_matcher, language_get_symbol_name_matcher):
Declare.
* linespec.c (iterate_over_all_matching_symtabs)
(iterate_over_file_blocks): Adjust to use lookup_name_info.
(find_methods): Add language parameter, and use lookup_name_info
and the language's symbol_name_matcher_ftype.
(linespec_complete_function): Adjust.
(lookup_prefix_sym): Use lookup_name_info.
(add_all_symbol_names_from_pspace): Adjust.
(find_superclass_methods): Add language parameter and pass it
down.
(find_method): Pass symbol language down.
(find_linespec_symbols): Don't demangle or Ada encode here.
(search_minsyms_for_name): Add lookup_name_info parameter.
(add_matching_symbols_to_info): Add name_match_type parameter.
Use lookup_name_info.
* m2-lang.c (m2_language_defn): Adjust comments to refer to
la_get_symbol_name_matcher.
* minsyms.c: Include <algorithm>.
(add_minsym_to_demangled_hash_table): Remove table parameter and
add objfile parameter. Use search_name_hash, and add language to
demangled languages vector.
(struct found_minimal_symbols): New struct.
(lookup_minimal_symbol_mangled, lookup_minimal_symbol_demangled):
New functions.
(lookup_minimal_symbol): Adjust to use them. Don't canonicalize
input names here. Use lookup_name_info instead. Lookup up
demangled names once for each language in the demangled names
vector.
(iterate_over_minimal_symbols): Use lookup_name_info. Lookup up
demangled names once for each language in the demangled names
vector.
(build_minimal_symbol_hash_tables): Adjust.
* minsyms.h (iterate_over_minimal_symbols): Adjust to pass down a
lookup_name_info.
* objc-lang.c (objc_language_defn): Adjust comment to refer to
la_get_symbol_name_matcher.
* objfiles.h: Include <vector>.
(objfile_per_bfd_storage) <demangled_hash_languages>: New field.
* opencl-lang.c (opencl_language_defn): Adjust comment to refer to
la_get_symbol_name_matcher.
* p-lang.c (pascal_language_defn): Adjust comment to refer to
la_get_symbol_name_matcher.
* psymtab.c (psym_lookup_symbol): Use lookup_name_info.
(match_partial_symbol): Use symbol_name_match_type,
lookup_name_info and psymbol_name_matches.
(lookup_partial_symbol): Use lookup_name_info.
(map_block): Use symbol_name_match_type and lookup_name_info.
(psym_map_matching_symbols): Use symbol_name_match_type.
(psymbol_name_matches): New.
(recursively_search_psymtabs): Use lookup_name_info and
psymbol_name_matches. Rename 'kind' parameter to 'domain'.
(psym_expand_symtabs_matching): Use lookup_name_info. Rename
'kind' parameter to 'domain'.
* rust-lang.c (rust_language_defn): Adjust comment to refer to
la_get_symbol_name_matcher.
* symfile-debug.c (debug_qf_map_matching_symbols)
(debug_qf_map_matching_symbols): Use symbol_name_match_type.
(debug_qf_expand_symtabs_matching): Use lookup_name_info.
* symfile.c (expand_symtabs_matching): Use lookup_name_info.
* symfile.h (quick_symbol_functions) <map_matching_symbols>:
Adjust to use symbol_name_match_type.
<expand_symtabs_matching>: Adjust to use lookup_name_info.
(expand_symtabs_matching): Adjust to use lookup_name_info.
* symmisc.c (maintenance_expand_symtabs): Use
lookup_name_info::match_any ().
* symtab.c (symbol_matches_search_name): New.
(eq_symbol_entry): Adjust to use lookup_name_info and the
language's matcher.
(demangle_for_lookup_info::demangle_for_lookup_info): New.
(lookup_name_info::match_any): New.
(iterate_over_symbols, search_symbols): Use lookup_name_info.
(compare_symbol_name): Add language, lookup_name_info and
completion_match_result parameters, and use them.
(completion_list_add_name): Make extern. Add language and
lookup_name_info parameters. Use them.
(completion_list_add_symbol, completion_list_add_msymbol)
(completion_list_objc_symbol): Add lookup_name_info parameters and
adjust. Pass down language.
(completion_list_add_fields): Add lookup_name_info parameters and
adjust. Pass down language.
(add_symtab_completions): Add lookup_name_info parameters and
adjust.
(default_collect_symbol_completion_matches_break_on): Add
name_match_type parameter, and use it. Use lookup_name_info.
(default_collect_symbol_completion_matches)
(collect_symbol_completion_matches): Add name_match_type
parameter, and pass it down.
(collect_symbol_completion_matches_type): Adjust.
(collect_file_symbol_completion_matches): Add name_match_type
parameter, and use lookup_name_info.
* symtab.h: Include <string> and "common/gdb_optional.h".
(enum class symbol_name_match_type): New.
(class ada_lookup_name_info): New.
(struct demangle_for_lookup_info): New.
(class lookup_name_info): New.
(symbol_name_matcher_ftype): New.
(SYMBOL_MATCHES_SEARCH_NAME): Use symbol_matches_search_name.
(symbol_matches_search_name): Declare.
(MSYMBOL_MATCHES_SEARCH_NAME): Delete.
(default_collect_symbol_completion_matches)
(collect_symbol_completion_matches)
(collect_file_symbol_completion_matches): Add name_match_type
parameter.
(iterate_over_symbols): Use lookup_name_info.
(completion_list_add_name): Declare.
* utils.c (enum class strncmp_iw_mode): Moved to utils.h.
(strncmp_iw_with_mode): Now extern.
* utils.h (enum class strncmp_iw_mode): Moved from utils.c.
(strncmp_iw_with_mode): Declare.
gdb/testsuite/ChangeLog:
2017-11-08 Pedro Alves <palves@redhat.com>
* gdb.ada/complete.exp (p <Exported_Capitalized>): New test.
(p Exported_Capitalized): New test.
(p exported_capitalized): New test.
Currently, we have a mess of symbol name hashing/comparison routines.
There's msymbol_hash for mangled names, and dict_hash and
msymbol_hash_iw for demangled names. Then there's strcmp_iw,
strcmp_iw_ordered and Ada's full_match/wild_match, which all have to
agree with the hashing routines. That's why dict_hash is really about
Ada names. From the inconsistency department, minimal symbol hashing
doesn't go via dict_hash, so Ada's wild matching can't ever work with
minimal symbols.
This patch starts fixing this, by doing two things:
#1 - adds a language vector method to let each language decide how to
compute a symbol name hash.
#2 - makes dictionaries know the language of the symbols they hold,
and then use the dictionaries language to decide which hashing
method to use.
For now, this is just scaffolding, since all languages install the
default method. The series will make C++ install its own hashing
method later on, and will add per-language symbol name comparison
routines too.
This patch was originally based on a patch that Keith wrote for the
libcc1/C++ WIP support.
gdb/ChangeLog:
2017-11-08 Keith Seitz <keiths@redhat.com>
Pedro Alves <palves@redhat.com>
* ada-lang.c (ada_language_defn): Install
default_search_name_hash.
* buildsym.c (struct buildsym_compunit): <language>: New field.
(finish_block_internal): Pass language when creating dictionaries.
(start_buildsym_compunit, start_symtab): New language parameters.
Use them.
(restart_symtab): Pass down compilation unit's language.
* buildsym.h (enum language): Forward declare.
(start_symtab): New 'language' parameter.
* c-lang.c (c_language_defn, cplus_language_defn)
(asm_language_defn, minimal_language_defn): Install
default_search_name_hash.
* coffread.c (coff_start_symtab): Adjust.
* d-lang.c (d_language_defn): Install default_search_name_hash.
* dbxread.c (struct symloc): Add 'pst_language' field.
(PST_LANGUAGE): Define.
(start_psymtab, read_ofile_symtab): Use it.
(process_one_symbol): New 'language' parameter. Pass it down.
* dictionary.c (struct dictionary) <language>: New field.
(DICT_LANGUAGE): Define.
(dict_create_hashed, dict_create_hashed_expandable)
(dict_create_linear, dict_create_linear_expandable): New parameter
'language'. Set the dictionary's language.
(iter_match_first_hashed): Adjust to rename.
(insert_symbol_hashed): Assert we don't see mismatching
languages. Adjust to rename.
(dict_hash): Rename to ...
(default_search_name_hash): ... this and make extern.
* dictionary.h (struct language_defn): Forward declare.
(dict_create_hashed): New parameter 'language'.
* dwarf2read.c (dwarf2_start_symtab): Pass down language.
* f-lang.c (f_language_defn): Install default_search_name_hash.
* go-lang.c (go_language_defn): Install default_search_name_hash.
* jit.c (finalize_symtab): Pass compunit's language to dictionary
creation.
* language.c (unknown_language_defn, auto_language_defn):
* language.h (language_defn::la_search_name_hash): New field.
(default_search_name_hash): Declare.
* m2-lang.c (m2_language_defn): Install default_search_name_hash.
* mdebugread.c (new_block): New parameter 'language'.
* mdebugread.c (parse_symbol): Pass symbol language to block
allocation.
(psymtab_to_symtab_1): Pass down language.
(new_symtab): Pass compunit's language to block allocation.
* objc-lang.c (objc_language_defn): Install
default_search_name_hash.
* opencl-lang.c (opencl_language_defn):
* p-lang.c (pascal_language_defn): Install
default_search_name_hash.
* rust-lang.c (rust_language_defn): Install
default_search_name_hash.
* stabsread.h (enum language): Forward declare.
(process_one_symbol): Add 'language' parameter.
* symtab.c (search_name_hash): New function.
* symtab.h (search_name_hash): Declare.
* xcoffread.c (read_xcoff_symtab): Pass language to start_symtab.
This patch gets rid of block_iter_name_* as being unnecessary. It's
the same as calling block_iter_match_*, and passing strcmp_iw as
comparison routine.
(A later patch will get rid of those new explicit strcmp_iw calls.)
gdb/ChangeLog:
2017-07-20 Pedro Alves <palves@redhat.com>
* block.c (block_iter_name_step, block_iter_name_first)
(block_iter_name_next): Delete.
(block_lookup_symbol_primary): Adjust to use
dict_iter_match_first/dict_iter_match_next.
* block.h (block_iter_name_first, block_iter_name_next): Delete
declarations.
(ALL_BLOCK_SYMBOLS_WITH_NAME): Adjust to use
dict_iter_match_first/dict_iter_match_next.
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.
gdb/ChangeLog:
Update copyright year range in all GDB files.
This commit introduces a new inline common function "startswith"
which takes two string arguments and returns nonzero if the first
string starts with the second. It also updates the 295 places
where this logic was written out longhand to use the new function.
gdb/ChangeLog:
* common/common-utils.h (startswith): New inline function.
All places where this logic was used updated to use the above.
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
Consider the following declaration:
package Pck is
task Dummy_Task is
entry Start;
end Dummy_Task;
end Pck;
Inserting a breakpoint on the body of that task does not currently
work:
(gdb) b pck.dummy_task
"pck.dummy_task" is not a function
Make breakpoint pending on future shared library load? (y or [n]) n
What happens here is that the compiler generates two symbols:
(a) Symbol `pck__dummy_task' which is a *variable* referencing
the task;
(b) Symbol `pck__dummy_taskTKB' which is the subprogram implementing
the body of the task.
The symbol lookup only finds the variable before of the TKB suffix in
the subprogram name. This patch fixes the problem by adjusting the
ada-lang.c:is_name_suffix routine to recognize "TKB" suffixes. But
that's not enough, because the search in the symtab is performed via
the block dictionary, using a hashing algorithm. So, for the search
to find `pck__dummy_taskTKB', I had to modify the hashing function
to ignore TKB suffixes as well.
gdb/ChangeLog:
* ada-lang.c (is_name_suffix): Add handling of "TKB" suffixes.
Update function documentation.
* dictionary.c (dict_hash): Ignore "TKB" suffixes in hash
computation.
gdb/testsuite/ChangeLog:
* gdb.ada/task_bp: New testcase.
Code cleanup.
* dictionary.c (dict_hash): Use SYMBOL_HASH_NEXT.
* dwarf2read.c (mapped_index_string_hash): Refer to SYMBOL_HASH_NEXT
in the function comment, a new note on values compatibility.
* minsyms.c (msymbol_hash_iw, msymbol_hash): Use SYMBOL_HASH_NEXT.
* symtab.h (SYMBOL_HASH_NEXT): New.
This change gets rid of an ARI warning which was recently introduced
by one of our changes.
gdb/ChangeLog:
* dictionary.c (dict_hash): Move assignment out of if condition.
Several changes to dict_hash from Adacore's local version were inadvertantly
left out of the last change to that function. These changes conservatively
cause dict_hash to revert to msymbol_hash_iw in more cases where the symbol
being hashed is known not to be Ada-encoded. This avoids a few cases where
the function hashes large groups of names with similar prefixes to the same
value.
Changelog:
gdb/
* dictionary.c (dict_hash): Revert to msymbol_hash_iw in
more cases.
This patch allows Ada to speed up symbol lookup by using the facilities
in dictionary.[ch] for hashed lookups. First, we generalize dictionary
search to allow clients to specify any matching function compatible with
the hashing function. Next, we modify the hashing algorithm so that symbols
that wild-match a name hash to the same value. Finally, we modify Ada
symbol lookup to use these facilities.
Because this patch touches on a hashing algorithm used by other
languages, I took the precaution of doing a speed test on a list of
about 12000 identifiers (repeatedly inserting all of them into a table
and then doing a lookup on a million names at random, thus testing the
speed of the hashing algorithm and how well it distributed names).
There was actually a slight speedup, probably as a result of open-
coding some of the tests in msymbol_hash_iw. By design, the revised
hashing algorithm produces the same results as the original on most
"normal" C identifiers.
We considered augmenting the dictionary interface still further by allowing
different hashing algorithms for different dictionaries, based on the
(supposed) language of the symbols in that dictionary. While this produced
better isolation of the changes to Ada programs, the additional flexibility
also complicated the dictionary interface. I'd prefer to keep things
simple for now.
Tested w/o regressions on Linux i686.
ChangeLog:
gdb/
* ada-lang.c (ada_match_name): Use new API for wild_match.
(wild_match): Change API to be consistent with that of strcmp_iw;
return 0 for a match, and switch operand order.
(full_match): New function.
(ada_add_block_symbols): Use dict_iter_match_{first,next} for
matching to allow use of hashing.
* dictionary.c (struct dict_vector): Generalize iter_name_first,
iter_name_next ot iter_match_first, iter_match_next.
(iter_name_first_hashed): Replace with iter_match_first_hashed.
(iter_name_next_hashed): Replace with iter_match_next_hashed.
(iter_name_first_linear): Replace with iter_match_first_linear.
(iter_name_next_linear): Replace with iter_match_next_linear.
(dict_iter_name_first): Re-implement to use dict_iter_match_first.
(dict_iter_name_next): Re-implement to use dict_iter_match_next.
(dict_iter_match_first): New function.
(dict_iter_match_next): New function.
(dict_hash): New function.
* dictionary.h (dict_iter_match_first, dict_iter_match_next): Declare.
* psymtab.c (ada_lookup_partial_symbol): Use new wild_match API.
Andrew Burgess
Joel Brobecker
Christian Biesinger
Simon Marchi
Tom Tromey
Keith Seitz
Pedro Alves
Simon Marchi
Gary Benson
Joel Brobecker
Doug Evans
Jan Kratochvil
Michael Snyder
Paul N. Hilfinger
Daniel Jacobowitz
Eli Zaretskii