git.libre-soc.org Git - binutils-gdb.git/log

Add a selftest that checks documentation invariants.

Several approaches were discussed (mail or irc) to verify the invariants of
the GDB help documentation : checking with apropos ., modifying add_cmd
to do the check and output a warning, implement maintenance check-doc.

A selftest was finally chosen as:
  * this can be run on demand, including by users if they want
    to check user defined commands.
  * it does not interact with the normal behaviour of apropos, define,
    python, ...
    (such as output warnings when a user defines a command help that
     does not respect the doc).
  * when the selftest runs, it checks the user defined and python
    defined commands currently defined.

gdb/ChangeLog
* unittests/help-doc-selftests.c: New file.
* Makefile.in: Add the new file.

Make first and last lines of 'command help documentation' consistent.

With this patch, the help docs now respect 2 invariants:
  * The first line of a command help is terminated by a '.' character.
  * The last character of a command help is not a newline character.

Note that the changes for the last invariant were done by Tom, as part of :
[PATCH] Remove trailing newlines from help text
https://sourceware.org/ml/gdb-patches/2019-06/msg00050.html
but some occurrences have been re-introduced since then.

Some help docs had to be rephrased/restructured to respect the above
invariants.

Before this patch, print_doc_line was printing the first line
of a command help documentation, but stopping at the first '.'
or ',' character.

This was giving inconsistent results :
  * The first line of command helps was sometimes '.' terminated,
    sometimes not.
  * The first line of command helps was not always designed to be
    readable/understandable/unambiguous when stopping at the first
    '.' or ',' character.

This e.g. created the following inconsistencies/problems:
< catch exception -- Catch Ada exceptions
< catch handlers -- Catch Ada exceptions
< catch syscall -- Catch system calls by their names
< down-silently -- Same as the `down' command
while the new help is:
> catch exception -- Catch Ada exceptions, when raised.
> catch handlers -- Catch Ada exceptions, when handled.
> catch syscall -- Catch system calls by their names, groups and/or numbers.
> down-silently -- Same as the `down' command, but does not print anything.

Also, the command help doc should not be terminated by a newline
character, but this was not respected by all commands.
The cli-option -OPT framework re-introduced some occurences.
So, the -OPT build help framework was changed to not output newlines at the
end of %OPTIONS% replacement.

This patch changes the help documentations to ensure the 2 invariants
given above.

It implied to slightly rephrase or restructure some help docs.

Based on the above invariants, print_doc_line (called by
'apropos' and 'help' commands to print the first line of a command
help) now outputs the full first line of a command help.

This all results in a lot of small changes in the produced help docs.
There are less code changes than changes in the help docs, as a lot
of docs are produced by some code (e.g. the remote packet usage settings).

gdb/ChangeLog
2019-08-07  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

* cli/cli-decode.h (print_doc_line): Add for_value_prefix argument.
* cli/cli-decode.c (print_doc_line): Likewise.  It now prints
the full first line, except when FOR_VALUE_PREFIX.  In this case,
the trailing '.' is not output, and the first character is uppercased.
(print_help_for_command): Update call to print_doc_line.
(print_doc_of_command): Likewise.
* cli/cli-setshow.c (deprecated_show_value_hack): Likewise.
* cli/cli-option.c (append_indented_doc): Do not append newline.
(build_help_option): Append newline after first appended_indented_doc
only if a second call is done.
(build_help): Append 2 new lines before each option, except the first
one.
* compile/compile.c (_initialize_compile): Add new lines after
%OPTIONS%, when not at the end of the help.
Change help doc or code
producing the help doc to respect the invariants.
* maint-test-options.c (_initialize_maint_test_options): Likewise.
Also removed the new line after 'Options:', as all other commands
do not put an empty line between 'Options:' and the first option.
* printcmd.c (_initialize_printcmd): Likewise.
* stack.c (_initialize_stack): Likewise.
* interps.c (interpreter_exec_cmd): Fix "Usage:" line that was
incorrectly telling COMMAND is optional.
* ada-lang.c (_initialize_ada_language): Change help doc or code
producing the help doc to respect the invariants.
* ada-tasks.c (_initialize_ada_tasks): Likewise.
* breakpoint.c (_initialize_breakpoint): Likewise.
* cli/cli-cmds.c (_initialize_cli_cmds): Likewise.
* cli/cli-logging.c (_initialize_cli_logging): Likewise.
* cli/cli-setshow.c (_initialize_cli_setshow): Likewise.
* cli/cli-style.c (cli_style_option::add_setshow_commands,
_initialize_cli_style): Likewise.
* corelow.c (core_target_info): Likewise.
* dwarf-index-cache.c (_initialize_index_cache): Likewise.
* dwarf2read.c (_initialize_dwarf2_read): Likewise.
* filesystem.c (_initialize_filesystem): Likewise.
* frame.c (_initialize_frame): Likewise.
* gnu-nat.c (add_task_commands): Likewise.
* infcall.c (_initialize_infcall): Likewise.
* infcmd.c (_initialize_infcmd): Likewise.
* interps.c (_initialize_interpreter): Likewise.
* language.c (_initialize_language): Likewise.
* linux-fork.c (_initialize_linux_fork): Likewise.
* maint-test-settings.c (_initialize_maint_test_settings): Likewise.
* maint.c (_initialize_maint_cmds): Likewise.
* memattr.c (_initialize_mem): Likewise.
* printcmd.c (_initialize_printcmd): Likewise.
* python/lib/gdb/function/strfns.py (_MemEq, _StrLen, _StrEq,
_RegEx): Likewise.
* ravenscar-thread.c (_initialize_ravenscar): Likewise.
* record-btrace.c (_initialize_record_btrace): Likewise.
* record-full.c (_initialize_record_full): Likewise.
* record.c (_initialize_record): Likewise.
* regcache-dump.c (_initialize_regcache_dump): Likewise.
* regcache.c (_initialize_regcache): Likewise.
* remote.c (add_packet_config_cmd, init_remote_threadtests,
_initialize_remote): Likewise.
* ser-tcp.c (_initialize_ser_tcp): Likewise.
* serial.c (_initialize_serial): Likewise.
* skip.c (_initialize_step_skip): Likewise.
* source.c (_initialize_source): Likewise.
* stack.c (_initialize_stack): Likewise.
* symfile.c (_initialize_symfile): Likewise.
* symtab.c (_initialize_symtab): Likewise.
* target-descriptions.c (_initialize_target_descriptions): Likewise.
* top.c (init_main): Likewise.
* tracefile-tfile.c (tfile_target_info): Likewise.
* tracepoint.c (_initialize_tracepoint): Likewise.
* tui/tui-win.c (_initialize_tui_win): Likewise.
* utils.c (add_internal_problem_command): Likewise.
* valprint.c (value_print_option_defs): Likewise.

gdb/testsuite/ChangeLog
2019-08-07  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

* gdb.base/style.exp: Update tests for help doc new invariants.
* gdb.base/help.exp: Likewise.

[PR build/24886] disable glibc mcheck support

This patch drops gdb's configury support for glibc's mcheck function.
It has been observed to cause false abort()s, because it is
thread-unsafe yet interposes every malloc/free operation.  So if any
library transitively used by gdb also uses threads, then these
functions can easily corrupt their own checking data.  These days, gcc
ASAN and valgrind provide high quality checking, and mcheck is
apparently itself being slowly deprecated.

So, let's stop linking to it.  Attached patch drops the
autoconf/Makefile machinery for both gdb and gdbserver.  No
testsuite-visible impact.  IMHO not worth mentioning in NEWS.

See also: https://sourceware.org/bugzilla/show_bug.cgi?id=9939

gdb/ChangeLog

        PR build/24886
        * configure.ac: Drop enable-libmcheck support.
        * configure, config.in: Rebuild.
        * libmcheck.m4: Remove.
        * acinclude.m4: Don't include it.
        * Makefile.in: Don't distribute it.
        * top.c (print_gdb_configuration): Don't mention it.

gdb/gdbserver/ChangeLog

        PR build/24886
        * configure.ac: Drop enable-libmcheck support.
        * configure, config.in: Rebuild.
        * acinclude.m4: Don't include it.

Add more styling to "disassemble"

This adds more styling to the disassemble command.  In particular,
addresses and function names in the disassembly are now styled.

This required fixing a small latent bug in set_output_style.  This
function always passed NULL to emit_style_escape; but when writing to
a file other than gdb_stdout, it should emit the style escape
directly.  (FWIW this is another argument for better integrating the
pager with ui_file and getting rid of this entire layer.)

gdb/ChangeLog
2019-08-06  Tom Tromey  <tom@tromey.com>

* utils.c (set_output_style): Sometimes pass stream to
emit_style_escape.
* ui-out.h (class ui_out) <can_emit_style_escape>: Declare.
* record-btrace.c (btrace_insn_history): Update.
* mi/mi-out.h (class mi_ui_out) <can_emit_style_escape>: New
method.
* disasm.h (gdb_pretty_print_disassembler): Add uiout parameter.
Update initializers.
<m_uiout>: New field.
<m_di>: Move lower.
* disasm.c (gdb_pretty_print_disassembler::pretty_print_insn):
Remove "uiout" parameter.
(dump_insns): Update.
* cli-out.h (class cli_ui_out) <can_emit_style_escape>: Declare.
* cli-out.c (cli_ui_out::can_emit_style_escape): New method.

gdb/testsuite/ChangeLog
2019-08-06  Tom Tromey  <tom@tromey.com>

* gdb.base/style.exp: Add disassemble test.
* gdb.base/style.c (some_called_function): New function.
(main): Use it.

Replace int with enum block_enum where appropriate.

For better readability and type safety.

gdb/ChangeLog:

2019-08-06 Christian Biesinger <cbiesinger@google.com>

* symtab.c (symbol_cache_lookup): Change int to enum block_enum.
(error_in_psymtab_expansion): Likewise.
(lookup_symbol_via_quick_fns): Likewise.
(basic_lookup_transparent_type_quick): Likewise.
(basic_lookup_transparent_type_1): Likewise.

Clean up source file error reporting

print_source_lines_base reopens the source file every time that a
source line is to be printed.  However, there's no need to do this so
frequently -- it's enough to do it when switching source files, and
otherwise rely on the cache.

The code seems to try to avoid these multiple opens; at a guess I'd
say something just got confused along the way.

This patch fixes the problem by reorganizing the code both to make it
more clear, and to ensure that reopens only occur when the "last
source visited" changes.

gdb/ChangeLog
2019-08-06  Tom Tromey  <tromey@adacore.com>

* source.c (last_source_error): Now bool.
(print_source_lines_base): Make "noprint" bool.  Only open
source file when last_source_visited changes.

Add file offsets to the source cache

Currently, gdb stores the number of lines and an array of file offsets
for the start of each line in struct symtab.  This patch moves this
information to the source cache.  This has two benefits.

First, it allows gdb to read a source file less frequently.
Currently, a source file may be read multiple times: once when
computing the file offsets, once when highlighting, and then pieces
may be read again while printing source lines.  With this change, the
file is read once for its source text and file offsets; and then
perhaps read again if it is evicted from the cache.

Second, if multiple symtabs cover the same source file, then this will
share the file offsets between them.  I'm not sure whether this
happens in practice.

gdb/ChangeLog
2019-08-06  Tom Tromey  <tromey@adacore.com>

* annotate.c (annotate_source_line): Use g_source_cache.
* source-cache.c (source_cache::get_plain_source_lines): Change
parameters.  Populate m_offset_cache.
(source_cache::ensure): New method.
(source_cache::get_line_charpos): New method.
(extract_lines): Move lower.  Change parameters.
(source_cache::get_source_lines): Move lower.
* source-cache.h (class source_cache): Update comment.
<get_line_charpos>: New method.
<get_source_lines>: Update comment.
<clear>: Clear m_offset_cache.
<get_plain_source_lines>: Change parameters.
<ensure>: New method
<m_offset_cache>: New member.
* source.c (forget_cached_source_info_for_objfile): Update.
(info_source_command): Use g_source_cache.
(find_source_lines, open_source_file_with_line_charpos): Remove.
(print_source_lines_base, search_command_helper): Use g_source_cache.
* source.h (open_source_file_with_line_charpos): Don't declare.
* symtab.h (struct symtab) <nlines, line_charpos>: Remove.
* tui/tui-source.c (tui_source_window::do_scroll_vertical):
Use g_source_cache.

Save plain text in the source cache

Currently the source cache will only store highlighted text.  However,
there's no reason it could not also store plain text, when styling is
turned off.

This patch makes this change.  This also simplifies the source cache
code somewhat.

gdb/ChangeLog
2019-08-06  Tom Tromey  <tromey@adacore.com>

* source-cache.c (source_cache::get_plain_source_lines):
Remove "first_line" and "last_line" parameters.
(source_cache::get_source_lines): Cache plain text.
* source-cache.h (class source_cache)
<get_plain_source_lines>: Update.

Fix latent bug in source cache

The source cache was not returning the final \n of the requested range
of lines.  This caused regressions with later patches in this series,
so this patch pre-emptively fixes the bug.

This adds a self-test of "extract_lines" to the source cache code.  To
make it simpler to test, I changed extract_lines to be a static
function, and changed it's API a bit.

gdb/ChangeLog
2019-08-06  Tom Tromey  <tromey@adacore.com>

* source-cache.c (extract_lines): No longer a method.
Changed type of parameter.  Include final newline.
(selftests::extract_lines_test): New function.
(_initialize_source_cache): Likewise.
* source-cache.h (class source_cache)
<extract_lines>: Don't declare.

Change breakpoint::filter to be a unique_xmalloc_ptr

This changes breakpoint::filter to be a unique_xmalloc_ptr, removing
an explicit xfree, as well as a use of a "release" method.

gdb/ChangeLog
2019-08-06 Tom Tromey <tromey@adacore.com>

* breakpoint.c (init_breakpoint_sal): Update.
(breakpoint): Update.
* breakpoint.h (struct breakpoint) <filter>: Now a
unique_xmalloc_ptr.

LTO object insertion point

This is a mostly cosmetic fix for cases like PR24873 where LTO
recompiled objects were supposed to be inserted inside a group. The
specific case handled by this patch is when the first file inside a
group is an archive, the first file claimed by the plugin. Prior to
this patch we would have inserted the recompiled objects before the
group, which doesn't matter really since the entire group will be
reloaded, but it looks a little wrong in map files.

PR 24873
* ldlang.c (find_replacements_insert_point): Return "before" flag.
(find_next_input_statement): New function.
(lang_process): When placing recompiled LTO objects before a
claimed archive, place them immediately before in the statement
list.

PR24873, gcc -flto objects result in --start-group .. --end-group failure to include --as-needed libraries

Reloading of archives (and checking --as-needed DSOs again) is
disabled until we hit the plugin insert point. It's necessary to do
that because in a case like lib1.a lto.o lib2.a where lib1.a and
lib2.a contain duplicate symbols, we want the lto.o recompiled object
to pull in objects from lib2.a as necessary, but not from lib1.a.
Unfortunately this heuristic fails when the insert point is inside a
group, because ld actually loads the symbols from the recompiled
object before running over the contours of the script, thus missing
the fact that new undefs appeared in the group.

PR 24873
* ldlang.c (plugin_undefs): New static var.
(open_input_bfds <lang_group_statement_enum>): Loop on
plugin_undefs and hitting plugin_insert point.
(lang_process <lto_plugin_active>): Set plugin_undefs.

Automatic date update in version.in

Add block['var'] accessor

Currently we support iteration on blocks; this patch extends that to make
subscript access work as well.

gdb/ChangeLog:

2019-08-05  Christian Biesinger  <cbiesinger@google.com>

* NEWS: Mention dictionary access on blocks.
* python/py-block.c (blpy_getitem): New function.
(block_object_as_mapping): New struct.
(block_object_type): Use new struct for tp_as_mapping field.

gdb/doc/ChangeLog:

2019-08-05  Christian Biesinger  <cbiesinger@google.com>

* python.texi (Blocks In Python): Document dictionary access on blocks.

gdb/testsuite/ChangeLog:

2019-08-05  Christian Biesinger  <cbiesinger@google.com>

* gdb.python/py-block.exp: Test dictionary access on blocks.

Add a comment briefly explaining partial symbols

Based on an explanation by tromey on IRC.

gdb/ChangeLog:

2019-08-05 Christian Biesinger <cbiesinger@google.com>

* objfiles.h (objfile): Add a comment describing partial symbols.

Fix objcopy's note merging capabilities so that they no longer insist on the first note being a version note.

PR 24874
* objcopy.c (merge_gnu_build_notes): Do not insist on the first
note being a version note.

Increase timeout in gdb.mi/list-thread-groups-available.exp

Running

    make check-read1 TESTS="gdb.mi/list-thread-groups-available.exp"

on my machine results in timeout failures.  Running it while having
`tail -F testsuite/gdb.log` on the side shows that the test is never
really blocked, it is just slow at consuming the large output generated
by `-list-thread-groups --available` (which lists all the processes on
the system).

If I increase the timeout to a large value, the test passes in ~30
seconds (compared to under 1 second normally).

Increase the timeout for the particular mi_gdb_test that is long to
execute under read1.  The new timeout value is a bit arbitrary.  The
default timeout is 10 seconds, so I set the new timeout to be
"old-timeout * 10", so 100 seconds in the typical case.

gdb/testsuite/ChangeLog:

PR gdb/24863
* gdb.mi/list-thread-groups-available.exp: Increase timeout for
-list-thread-groups --available test when running under
check-read1.

[gdb/testsuite] Run read1 timeout tests with with_read1_timeout_factor

When running tests with check-read1, we run into some timeouts where the tests
are not easy to rewrite using gdb_test_sequence:
...
FAIL: gdb.base/help.exp: help data (timeout)
FAIL: gdb.base/help.exp: help files (timeout)
FAIL: gdb.base/help.exp: help internals (timeout)
FAIL: gdb.base/help.exp: help user-defined (timeout)
FAIL: gdb.base/help.exp: help breakpoint "b" abbreviation (timeout)
FAIL: gdb.base/help.exp: help breakpoint "br" abbreviation (timeout)
FAIL: gdb.base/help.exp: help breakpoint "bre" abbreviation (timeout)
FAIL: gdb.base/info-macros.exp: info macros 2 (timeout)
FAIL: gdb.base/info-macros.exp: next (timeout)
FAIL: gdb.base/info-macros.exp: info macros 3 (timeout)
FAIL: gdb.base/info-macros.exp: next (timeout)
FAIL: gdb.base/info-macros.exp: next (timeout)
FAIL: gdb.base/info-macros.exp: info macros (timeout)
FAIL: gdb.base/info-macros.exp: next (timeout)
FAIL: gdb.base/info-macros.exp: next (timeout)
FAIL: gdb.base/info-macros.exp: info macros 7 (timeout)
FAIL: gdb.cp/nested-types.exp: ptype S10 (limit = -1) // parse failed (timeout)
FAIL: gdb.cp/nested-types.exp: set print type nested-type-limit 1 (timeout)
...

Fix these by increasing the timeout by a factor 10.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-05 Tom de Vries <tdevries@suse.de>

PR testsuite/24863
* lib/gdb.exp (with_read1_timeout_factor): New proc.
* gdb.base/help.exp: Use with_read1_timeout_factor.
* gdb.base/info-macros.exp: Same.
* gdb.cp/nested-types.exp: Same.

Use _() in calls to build_help

Currently some code in gdb uses build_help with N_(), like:

  static const std::string compile_print_help
    = gdb::option::build_help (N_("\

I believe this is incorrect.  The N_ macro is used to mark text that
should end up in the message catalog, but which will be translated by
a later call to gettext.

However, in this case, there is no later call to gettext, so (if gdb
had translations), this text would remain untranslated.

Instead, I think using the ordinary _() macro is correct here.
Translators will have to know to preserve "%OPTIONS%" in the text --
but that seems both unavoidable and fine.

Tested by rebuilding as there's not much else to do.

gdb/ChangeLog
2019-08-05  Tom Tromey  <tromey@adacore.com>

* compile/compile.c (_initialize_compile): Use _(), not N_().
* thread.c (_initialize_thread): Use _(), not N_().
* stack.c (_initialize_stack): Use _(), not N_().
* printcmd.c (_initialize_printcmd): Use _(), not N_().

Removes support in the ARM assembler for the unsigned variants of the VQ(R)DMLAH and VQ(R)DMLASH MVE instructions.

Previously GAS would accept .u32, .u16 and .u8 suffixes to the VQ(R)DMLAH and VQ(R)DMLASH
instructions, however the Armv8.1-M Mainline specification states that these functions only
have signed variations (.s32, .s16 and .s8 suffixes).
This is documented here:
https://static.docs.arm.com/ddi0553/bh/DDI0553B_h_armv8m_arm.pdf?_ga=2.143079093.1892401233.1563295591-999473562.1560847439#page=1183

gas * config/tc-arm.c (do_mve_vqdmlah): Use N_S_32 macro.
(do_neon_qrdmlah): Use N_S_32 macro.
* testsuite/gas/arm/mve-vqdmlah-bad.d: New test.
* testsuite/gas/arm/mve-vqdmlah-bad.l: New test.
* testsuite/gas/arm/mve-vqdmlah-bad.s: New test.
* testsuite/gas/arm/mve-vqdmlah.d: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlah.s: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlash-bad.d: New test.
* testsuite/gas/arm/mve-vqdmlash-bad.l: New test.
* testsuite/gas/arm/mve-vqdmlash-bad.s: New test.
* testsuite/gas/arm/mve-vqdmlash.d: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlash.s: Remove unsigned instruction tests.

opcodes * arm-dis.c: Only accept signed variants of VQ(R)DMLAH and VQ(R)DMLASH
instructions.

[gdb/testsuite] Fail in gdb_compile if pie results in non-PIE executable

When running gdb.base/break-idempotent.exp with
--target_board=unix/-fno-PIE/-no-pie, we get:
...
nr of expected passes            140
...

The test-case is compiled once with nopie and once with pie, but in both cases
we end up with a non-PIE executable.  The "-fno-PIE -no-pie" options specified
using the target_board are interpreted by dejagnu as multilib_flags, and end up
overriding the pie flags.

Fix this by checking in gdb_compile if the resulting exec is non-PIE despite of
a pie setting, and if so return an error:
...
Running gdb/testsuite/gdb.base/break-idempotent.exp ...
gdb compile failed, pie failed to generate PIE executable

                === gdb Summary ===

nr of expected passes            70
nr of untested testcases         1
...

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-05  Tom de Vries  <tdevries@suse.de>

* lib/gdb.exp (version_at_least): Factor out of ...
(tcl_version_at_least): ... here.
(gdb_compile): Fail if pie results in non-PIE executable.
(readelf_version, readelf_prints_pie): New proc.
(exec_is_pie): Return -1 if unknown.

[gdb/testsuite] Fix typo in tcl_version_at_least

In tcl_version_at_least we compare a minor against a major version number:
...
    } elseif { $tcl_version_major == $major \
                  && $tcl_version_major >= $minor } {
...

Fix this by using $tcl_version_minor in the comparison instead.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-05  Tom de Vries  <tdevries@suse.de>

* lib/gdb.exp (tcl_version_at_least): Fix typo.

Catch potential integer overflow in readelf when processing corrupt binaries.

PR 24829
* readelf.c (apply_relocations): Catch potential integer overflow
whilst checking reloc location against section size.

Remove some variables in favor of using gdb::optional

While reading that code, I noticed that some variables essentially meant
whether to consider some other variable or not. I think using
gdb::optional (which was not available when this code was written) is
clearer, as it embeds the used/not used predicate directly in the type
of the variable, making it harder to miss.

gdb/ChangeLog:

* dwarf2read.c (struct dw2_symtab_iterator):
<want_specific_block>: Remove.
<block_index>: Change type to gdb::optional.
(dw2_symtab_iter_init): Remove WANT_SPECIFIC_BLOCK parameter,
change type of BLOCK_INDEX parameter to gdb::optional.
(dw2_symtab_iter_next): Re-write in function of gdb::optional.
(dw2_lookup_symbol): Don't pass argument for
WANT_SPECIFIC_BLOCK.
(dw2_expand_symtabs_for_function): Don't pass argument for
WANT_SPECIFIC_BLOCK, pass empty optional for BLOCK_INDEX.
(class dw2_debug_names_iterator)
<dw2_debug_names_iterator>: Remove WANT_SPECIFIC_BLOCK
parameter, change BLOCK_INDEX type to gdb::optional.
<m_want_specific_block>: Remove.
<m_block_index>: Change type to gdb::optional.
(dw2_debug_names_iterator::next): Change type of IS_STATIC to
gdb::optional. Re-write in function of gdb::optional.
(dw2_debug_names_lookup_symbol): Don't pass argument for
WANT_SPECIFIC_BLOCK.
(dw2_debug_names_expand_symtabs_for_function): Don't pass
argument for WANT_SPECIFIC_BLOCK, pass empty optional for
BLOCK_INDEX.

Automatic date update in version.in

Skip GDB test reconnect-ctrl-c.exp if nointerrupts is set.

2019-08-04 Sandra Loosemore <sandra@codesourcery.com>

gdb/testsuite/
* gdb.server/reconnect-ctrl-c.exp: Skip if nointerrupts.

Add check for readline support to more GDB tab-completion tests.

2019-08-04 Sandra Loosemore <sandra@codesourcery.com>

gdb/testsuite/
* lib/completion-support.exp (test_gdb_complete_none): Skip
tab completion tests if no readline support.
(test_gdb_complete_unique_re): Likewise.
(test_gdb_complete_multiple): Likewise.

Automatic date update in version.in

NEWS and documentation for info sources [-dirname | -basename] [--] [REGEXP].

gdb/ChangeLog
2019-08-03  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

        * NEWS: Mention changes to "info sources" command.

gdb/doc/ChangeLog
2019-08-03  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

        * gdb.texinfo (Symbols): Document new args -dirname and -basename
        of "info sources" command.

New test for 'info sources [-dirname | -basename] [--] [REGEXP]'.

This patch introduces a test for the 'info sources' command
and its new arguments [-dirname | -basename] [--] [REGEXP].

gdb/testsuite/ChangeLog

2019-08-03 Philippe Waroquiers <philippe.waroquiers@skynet.be>

* gdb.base/info_sources.exp: New file.
* gdb.base/info_sources.c: New file.
* gdb.base/info_sources_base.c: New file.

New "info sources" args [-dirname | -basename] [--] [REGEXP]

gdb/ChangeLog

2019-08-03 Philippe Waroquiers <philippe.waroquiers@skynet.be>

* symtab.c (filename_partial_match_opts): New struct type.
(struct output_source_filename_data): New members
regexp, c_regexp, partial_match.
(output_source_filename): Use new members to decide to print file.
(info_sources_option_defs): New variable.
(make_info_sources_options_def_group, print_info_sources_header,
info_sources_command_completer):
New functions.
(info_sources_command): Read new optional arguments.
(_initialize_symtab): Update info sources help.

Automatic date update in version.in

support Ada EH ABI v1

A new pair of hooks used by Ada exception handlers, for correct
release of reraised exception occurrences, involves the introduction
of new v1 symbols that GDB should use when available.  The older, v0
ABI remains available in newer runtimes for bootstrapping purposes
only.

for  gdb/ChangeLog

* ada-lang.c (exception_support_info_v0): Renamed from...
(default_exception_support_info): ... this.  Create new
definition for v1.
(ada_has_this_exception_support): Look up catch_handlers_sym.
(ada_exception_support_info_sniffer): Try v0 after default.

[GOLD] PowerPC64 pc-relative TLS support

Gold version of git commit c213164ad2.

elfcpp/
* powerpc.h (R_PPC64_TPREL34, R_PPC64_DTPREL34),
(R_PPC64_GOT_TLSGD34, R_PPC64_GOT_TLSLD34),
(R_PPC64_GOT_TPREL34, R_PPC64_GOT_DTPREL34): Define.
gold/
* powerpc.cc (Target_powerpc::Scan::get_reference_flags): Set
flags for new relocations, and some missing older relocs.
(Target_powerpc::Scan::local): Handle new pcrel tls relocs.
Call set_has_static_tls for tprel relocs.
(Target_powerpc::Scan::global): Likewise.
(Target_powerpc::Relocate::relocate): Handle new pcrel tls relocs.

[GOLD] PowerPC relocation signed overflow check

Relocations with right shifts were calculating wrong overflow status.
Since the addr34 split-field reloc is implemented as an 18-bit high
part with value shifted right by 16 and a 16-bit low part, most of the
pc-relative relocs were affected.

* powerpc.cc (Powerpc_relocate_functions::rela, rela_ua): Perform
signed right shift for signed overflow check.

PR24871, readelf segv in dump_ia64_unwind

PR 24871
* readelf.c (ABSADDR): Delete.
(dump_ia64_unwind): Expand ABSADDR. Check validity of info.section.

PowerPC tlsie test fix

* testsuite/ld-powerpc/tlsie.s: Correct medium model ELF sequence.

Automatic date update in version.in

RISC-V: Fix lui relax failure with relro.

bfd/ChangeLog
Ilia Diachkov <ilia.diachkov@optimitech.com>
* elfnn-riscv.c (_bfd_riscv_relax_lui): Set lui relax safety area to
two pages in relro presence.

Remove directory names from gdb.base/batch-exit-status.exp

Adjust gdb.base/batch-exit-status.exp so that test prefixes don't show
directory names for the source scripts passed with -x, to make test
results from different build directories comparable.

gdb/testsuite/ChangeLog:
2019-08-01 Pedro Franco de Carvalho <pedromfc@linux.ibm.com>

* gdb.base/batch-exit-status.exp: Call test_exit_status with
prefix argument.
(test_exit_status): Add prefix argument.

xtensa: bfd: add special case to loop alignment check

check_loop_aligned is used during link time relaxation to only allow
transformations that don't violate loop body alignment requirements.
Assembler can relax loops that have too long body by adding instructions
between the loop instruction and the loop body. check_loop_aligned must
check alignment of the first instruction of the actual loop body.
Detect loop / rsr.lend / wsr.lbeg sequence used in assembly time
relaxation and adjust alignment check when it's detected.

bfd/
2019-08-01 Max Filippov <jcmvbkbc@gmail.com>

* elf32-xtensa.c (insn_num_slots, get_rsr_lend_opcode)
(get_wsr_lbeg_opcode): New functions.
(check_loop_aligned): Detect relaxed loops and adjust loop_len
and insn_len for the first actual instruction of the loop.

Fix the ia64 libunwind build

This fixes the ia64 libunwind build.

gdb/ChangeLog
2019-08-01 Tom Tromey <tromey@adacore.com>

* ia64-libunwind-tdep.h (struct libunwind_descr): Include
gdbarch.h.

Include s12z-opc.h using ../opcodes.

This file exists in binutils-gdb/opcodes, and nothing in Makefile.in adds this
to the include path. Default builds work because in-tree readline adds
binutils-gdb/ to the include path (!). However, this is broken when compiling
with system readline.

Other files already use this way to include files in opcodes:
./gdb/lm32-tdep.c:#include "../opcodes/lm32-desc.h"
./gdb/or1k-tdep.h:#include "../opcodes/or1k-desc.h"
./gdb/mep-tdep.c:#include "../opcodes/mep-desc.h"

etc.

gdb/ChangeLog:

2019-08-01 Christian Biesinger <cbiesinger@google.com>

* s12z-tdep.c: Fix include path for s12z-opc.h.

Require GNU make 3.82

Gdbserver has failed to build with GNU make 3.81 since commit 08f10e02be.

Update the NEWS file to state that versions earlier than 3.82 are not
supported.

3.82 was released in 2010, 3.81 was released 2006. A quick investigation
of the default GNU make version provided across various distros found the
earliest provided version to be 3.82:
*RHEL 7, Centos 6 - make 3.82
*Fedora 27 - make 4.2.1
*OpenSuse 42.2, SLES11 - make 4.2.1
*Ubuntu 16.04/18.04 - make 4.1
*Debian Jessie - make 4.0

Note that Glibc requires at least 4.0, whereas GCC still allows 3.81.

gdb/ChangeLog:

* NEWS: Require GNU make 3.82.

[gdb/testsuite] Fix gdb.threads/fork-plus-threads.exp timeout with check-run1

With gdb.threads/fork-plus-threads.exp and check-run1 we get:
...
FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: \
inferior 1 exited (timeout)
...

Fix this by calling exp_continue for new thread and thread exited messages.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-01 Tom de Vries <tdevries@suse.de>

PR testsuite/24863
* gdb.threads/fork-plus-threads.exp: Fix check-run1 timeout by
calling exp_continue for new thread and thread exited messages.

[gdb/testsuite] Fix gdb.base/structs.exp timeout with check-read1

With gdb.base/structs.exp and check-read1 we get:
...
FAIL: gdb.base/structs.exp: p chartest (timeout)
...

Fix this by using gdb_test_sequence.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-01 Tom de Vries <tdevries@suse.de>

PR testsuite/24863
* gdb.base/structs.exp: Fix check-read1 timeout using
gdb_test_sequence.
* lib/gdb.exp (tcl_version_at_least, lrepeat): New proc.

[gdb/testsuite] Fix gdb.base/break-interp.exp timeout with check-read1

With gdb.base/break-interp.exp and check-read1, we run get:
...
FAIL: gdb.base/break-interp.exp: LDprelinkNOdebugNO: \
  BINprelinkNOdebugNOpieNO: symbol-less: info files (timeout)
FAIL: gdb.base/break-interp.exp: LDprelinkNOdebugNO: \
  BINprelinkNOdebugNOpieYES: symbol-less: info files (timeout)
FAIL: gdb.base/break-interp.exp: LDprelinkNOdebugIN: \
  BINprelinkNOdebugNOpieNO: symbol-less: info files (timeout)
FAIL: gdb.base/break-interp.exp: LDprelinkNOdebugIN: \
  BINprelinkNOdebugNOpieYES: symbol-less: info files (timeout)
...

Fix this by calling exp_continue after each "info files" line.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-01  Tom de Vries  <tdevries@suse.de>

PR testsuite/24863
* gdb.base/break-interp.exp: Use exp_continue after each "info files"
line.

[gdb/testsuite] Fix gdb.base/signals.exp timeout with check-read1

With gdb.base/signals.exp and check-read1 we get:
...
FAIL: gdb.base/signals.exp: info signals (timeout)
...

Fix this by using gdb_test_sequence.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-08-01 Tom de Vries <tdevries@suse.de>

PR testsuite/24863
* gdb.base/signals.exp: Fix check-read1 timeout using gdb_test_sequence.

PR24806, Linking with -T inside --start-group/--end-group

This patch processes INSERT AFTER and INSERT BEFORE in a user -T
script when such a script is invoked on the command line inside
--start-group/--end-group. Also, ld now warns when the user simply
forgot --end-group.

PR 24806
* ldlang.c (process_insert_statements): Add start of list
parameter. Use rather than lang_os_list.head. Process insert
statements inside group statements with a recursive call.
(lang_process): Adjust process_insert_statements call.
* lexsup.c (parse_args): Warn when adding missing --end-group.

Rename lang_output_section_statement to lang_os_list

The idea is to make it a little easier to find uses of this list,
so searches don't hit occurrences of lang_output_section_statement_type
and lang_output_section_statement_enum.

* ldlang.h (lang_os_list): Rename from lang_output_section_statement.
* ldlang.c: Likewise throughout file.
* emultempl/alphaelf.em: Likewise.
* emultempl/elf32.em: Likewise.
* emultempl/mmo.em: Likewise.
* emultempl/pe.em: Likewise.
* emultempl/pep.em: Likewise.
* emultempl/ppc32elf.em: Likewise.
* emultempl/spuelf.em: Likewise.

Automatic date update in version.in

Don't declare tui_copy_win or tui_box_win

tui_copy_win and tui_box_win are not implemented, so don't declare
them.

gdb/ChangeLog
2019-07-16 Tom Tromey <tom@tromey.com>

* tui/tui-wingeneral.h (tui_copy_win, tui_box_win): Don't
declare.

RISC-V: Fix minor issues with FP csr instructions.

Mel Chen <mel.chen@sifive.com>
gas/
* testsuite/gas/riscv/alias-csr.s: Add testcase for CSR-access
alias instructions.
* testsuite/gas/riscv/no-aliases-csr.d: Run testcase alias-csr.s with
-Mno-aliases.
* testsuite/gas/riscv/alias-csr.d: Run testcase alias-csr.s.
* testsuite/gas/riscv/priv-reg.d: Update.
opcodes/
* riscv-opc.c (riscv_opcodes): Set frsr, fssr, frcsr, fscsr, frrm,
fsrm, fsrmi, frflags, fsflags, fsflagsi to alias instructions.
* riscv-opc.c (riscv_opcodes): Adjust order of frsr, frcsr, fssr,
fscsr.

Allow nested function displays

In Ada, it's possible to have nested functions.  However,
block.c:contained_in does not recognize this.  Normally, this is no
problem, but if gdb is stopped inside a nested function, then you can
end up in the unexpected situation that "print" of an expression will
work, whereas "display" of the same expression will not -- because
contained_in returns 0.

This patch simply removes the BLOCK_FUNCTION check from contained_in.
The rationale here is that in languages without nested functions, this
will not cause any issues.

gdb/ChangeLog
2019-07-30  Tom Tromey  <tromey@adacore.com>

* block.c (contained_in): Remove BLOCK_FUNCTION check.

gdb/testsuite/ChangeLog
2019-07-30  Tom Tromey  <tromey@adacore.com>

* gdb.ada/display_nested.exp: New file.
* gdb.ada/display_nested/foo.adb: New file.
* gdb.ada/display_nested/pack.adb: New file.
* gdb.ada/display_nested/pack.ads: New file.

Allow display of negative offsets in print_address_symbolic()

When examining addresses associated with blocks with non-contiguous
address ranges, it's not uncommon to see large positive offsets which,
for some address width, actually represent a smaller negative offset.
Here's an example taken from the test case (using the
dw2-ranges-func-lo-cold executable):

    (gdb) x/5i foo_cold
       0x40110d <foo+4294967277>: push   %rbp
       0x40110e <foo+4294967278>: mov    %rsp,%rbp
       0x401111 <foo+4294967281>: callq  0x401106 <baz>
       0x401116 <foo+4294967286>: nop
       0x401117 <foo+4294967287>: pop    %rbp

This commit, in conjuction with an earlier patch from this series, causes
cases like the above to be displayed like this (below) instead:

(gdb) x/5i foo_cold
   0x40110d <foo_cold>: push   %rbp
   0x40110e <foo-18>: mov    %rsp,%rbp
   0x401111 <foo-15>: callq  0x401106 <baz>
   0x401116 <foo-10>: nop
   0x401117 <foo-9>: pop    %rbp

Note that the address of foo_cold is now (due to another patch) being
displayed as <foo_cold> instead of <foo+BigOffset>.  The subsequent
lines are shown as negative offsets from foo.

Disassembly using the "disassemble" command is somewhat affected by
these changes:

Before:

(gdb) disassemble foo_cold
Dump of assembler code for function foo:
Address range 0x401120 to 0x40113b:
   0x0000000000401120 <+0>: push   %rbp
   0x0000000000401121 <+1>: mov    %rsp,%rbp
   0x0000000000401124 <+4>: callq  0x401119 <bar>
   0x0000000000401129 <+9>: mov    0x2ef1(%rip),%eax        # 0x404020 <e>
   0x000000000040112f <+15>: test   %eax,%eax
   0x0000000000401131 <+17>: je     0x401138 <foo+24>
   0x0000000000401133 <+19>: callq  0x40110d <foo+4294967277>
   0x0000000000401138 <+24>: nop
   0x0000000000401139 <+25>: pop    %rbp
   0x000000000040113a <+26>: retq
Address range 0x40110d to 0x401119:
   0x000000000040110d <+-19>: push   %rbp
   0x000000000040110e <+-18>: mov    %rsp,%rbp
   0x0000000000401111 <+-15>: callq  0x401106 <baz>
   0x0000000000401116 <+-10>: nop
   0x0000000000401117 <+-9>: pop    %rbp
   0x0000000000401118 <+-8>: retq
End of assembler dump.

After:

(gdb) disassemble foo_cold
Dump of assembler code for function foo:
Address range 0x401120 to 0x40113b:
   0x0000000000401120 <+0>: push   %rbp
   0x0000000000401121 <+1>: mov    %rsp,%rbp
   0x0000000000401124 <+4>: callq  0x401119 <bar>
   0x0000000000401129 <+9>: mov    0x2ef1(%rip),%eax        # 0x404020 <e>
   0x000000000040112f <+15>: test   %eax,%eax
   0x0000000000401131 <+17>: je     0x401138 <foo+24>
   0x0000000000401133 <+19>: callq  0x40110d <foo_cold>
   0x0000000000401138 <+24>: nop
   0x0000000000401139 <+25>: pop    %rbp
   0x000000000040113a <+26>: retq
Address range 0x40110d to 0x401119:
   0x000000000040110d <-19>: push   %rbp
   0x000000000040110e <-18>: mov    %rsp,%rbp
   0x0000000000401111 <-15>: callq  0x401106 <baz>
   0x0000000000401116 <-10>: nop
   0x0000000000401117 <-9>: pop    %rbp
   0x0000000000401118 <-8>: retq
End of assembler dump.

Note that negative offsets are now displayed without the leading "+".
Also, the callq to foo_cold is now displayed as such instead of a callq
to foo with a large positive offset.

gdb/ChangeLog:

* printcmd.c (print_address_symbolic): Print negative offsets.
(build_address_symbolic): Force signed arithmetic when computing
offset.

[PR/24474] Add gdb.lookup_static_symbol to the python API

Similar to lookup_global_symbol, except that it checks the
STATIC_SCOPE.

gdb/ChangeLog:

2019-07-30  Christian Biesinger  <cbiesinger@google.com>

PR/24474: Add a function to lookup static variables.
* NEWS: Mention this new function.
* python/py-symbol.c (gdbpy_lookup_static_symbol): New function.
* python/python-internal.h (gdbpy_lookup_static_symbol): New function.
* python/python.c (python_GdbMethods): Add new function.

gdb/doc/ChangeLog:

2019-07-30  Christian Biesinger  <cbiesinger@google.com>

* python.texi (Symbols In Python): Document new function
gdb.lookup_static_symbol.

gdb/testsuite/ChangeLog:

2019-07-30  Christian Biesinger  <cbiesinger@google.com>

* gdb.python/py-symbol.c: Add a static variable and one in an anonymous
namespace.
* gdb.python/py-symbol.exp: Test gdb.lookup_static_symbol.

Add missing changelog entry

I forgot to commit the change before pushing commit
25ec8924842a215e7f684d3a5076607409ac822f

[gdb/testsuite] Work around tcl bug in libsegfault.exp with check-read1

When running libsegfault.exp with check-read1, I get:
...
Running gdb/testsuite/gdb.base/libsegfault.exp ...
ERROR: tcl error sourcing gdb/testsuite/gdb.base/libsegfault.exp.
ERROR: no such variable
    (read trace on "env(LD_PRELOAD)")
    invoked from within
"set env(LD_PRELOAD)"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 [list set $var]"
    invoked from within
"if [uplevel 1 [list array exists $var]] {
                set saved_arrays($var) [uplevel 1 [list array get $var]]
            } else {
                set saved_scalars($var) [uplevel ..."
    invoked from within
"if [uplevel 1 [list info exists $var]] {
            if [uplevel 1 [list array exists $var]] {
                set saved_arrays($var) [uplevel 1 [list array get $var]]
          ..."
    (procedure "save_vars" line 11)
    invoked from within
"save_vars { env(LD_PRELOAD) } {
        if { ![info exists env(LD_PRELOAD) ]
             || $env(LD_PRELOAD) == "" } {
            set env(LD_PRELOAD) "$lib"
        } else {
         ..."
    (procedure "gdb_spawn_with_ld_preload" line 4)
    invoked from within
"gdb_spawn_with_ld_preload $libsegfault """
...

There are several things here interacting with environment variable
LD_PRELOAD:
- the expect "binary" build/gdb/testsuite/expect-read1 with does
  export LD_PRELOAD=build/gdb/testsuite/read1.so before calling native expect
- read1.so which does unsetenv ("LD_PRELOAD") upon first call to read
- the test-case, which wants to set or append libSegFault.so to LD_PRELOAD

The error occurs when accessing $env(LD_PRELOAD), in a branch where
"info exists env(LD_PRELOAD)" returns true. AFAIU, this is
https://core.tcl-lang.org/tcl/tktview?name=67fd4f973a "incorrect results of
'info exists' when unset env var in one interp and check for existence from
another interp".

Work around the tcl bug by not unsetting the variable, but setting it to ""
instead:
...
-      unsetenv ("LD_PRELOAD");
+      setenv ("LD_PRELOAD", "", 1);
...

Verified that reverting commit de28a3b72e "[gdb/testsuite, 2/2] Fix
gdb.linespec/explicit.exp with check-read1" reintroduced the check-read1
failure in gdb.linespec/explicit.exp.

This fixes a similar error in attach-slow-waitpid.exp, which also sets
LD_PRELOAD.

Tested on x86_64-linux with check-read1.

gdb/testsuite/ChangeLog:

2019-07-30  Tom de Vries  <tdevries@suse.de>

* lib/read1.c (read): Don't use unsetenv (v), use setenv (v, "", 1)
instead.

[gdb/testsuite] Fail in gdb_compile if nopie results in PIE executable

When running gdb.base/dump.exp with --target_board=unix/-fPIE/-pie, we get:
...
Running gdb/testsuite/gdb.base/dump.exp ...
FAIL: gdb.base/dump.exp: dump array as value, intel hex
...

The FAIL happens because although the test specifies nopie, the exec is
in fact compiled as PIE.  The "-fPIE -pie" options specified using the
target_board are interpreted by dejagnu as multilib_flags, and end up
overriding the nopie flags.

Fix this by checking in gdb_compile if the resulting exec is PIE despite of
a nopie setting, and if so return an error:
...
Running gdb/testsuite/gdb.base/dump.exp ...
gdb compile failed, nopie failed to prevent PIE executable

                === gdb Summary ===

nr of untested testcases         1
...

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-30  Tom de Vries  <tdevries@suse.de>

PR testsuite/24834
* lib/gdb.exp (gdb_compile): Fail if nopie results in PIE executable.
(exec_is_pie): New proc.

Re: Support .gnu.lto_.lto section in ELF files

PR 24768
* bfd.c (struct bfd): Add lto_slim_object flag.
* bfd-in2.h: Regenerate.

Fix misspelling (nonexistant -> nonexistent)

gdb/testsuite/ChangeLog:

2019-07-29 Christian Biesinger <cbiesinger@google.com>

* gdb.python/py-objfile.exp: Fix misspelling (nonexistant -> nonexistent)

Add Objfile.lookup_{global,static}_symbol functions

This is essentially the inverse of Symbol.objfile. This allows
handling different symbols with the same name (but from different
objfiles) and can also be faster if the objfile is known.

gdb/ChangeLog:

2019-07-29  Christian Biesinger  <cbiesinger@google.com>

* NEWS: Mention new functions Objfile.lookup_{global,static}_symbol.
* python/py-objfile.c (objfpy_lookup_global_symbol): New function.
(objfpy_lookup_static_symbol): New function.
(objfile_object_methods): Add new functions.

gdb/doc/ChangeLog:

2019-07-29  Christian Biesinger  <cbiesinger@google.com>

* python.texi (Objfiles In Python): Document new functions
  Objfile.lookup_{global,static}_symbol.

gdb/testsuite/ChangeLog:

2019-07-29  Christian Biesinger  <cbiesinger@google.com>

* gdb.python/py-objfile.c: Add global and static vars.
* gdb.python/py-objfile.exp: Test new functions Objfile.
  lookup_global_symbol and lookup_static_symbol.

Automatic date update in version.in

Two fixes for test suite's terminal

Exactly which escape sequences are emitted by gdb in TUI mode are
determined largely by the curses implementation.  Testing my latest
(as yet unsubmitted) series to refactor the TUI showed a couple of
failures that I tracked to the test suite's terminal implementation.

In particular, the CSI "@" sequence was not implemented; and the CSI
"X" sequence was implemented incorrectly.

This patch fixes both of these problems.  Tested on x86-64 Fedora 28.

gdb/testsuite/ChangeLog
2019-07-29  Tom Tromey  <tom@tromey.com>

* lib/tuiterm.exp (Term::_csi_@): New proc.
(Term::_csi_X): Don't move cursor.

Document 'set print frame-info|frame-arguments presence'.

gdb/ChangeLog
2019-06-19  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

* NEWS: Mention 'set|show print frame-info'.  Mention new
'presence' value for 'frame-arguments'.  Mention new '-frame-info'
backtrace argument.  Mention that python frame filtering code
is now consistent with what 'backtrace' command prints.

gdb/doc/ChangeLog
2019-07-29  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

* gdb.texinfo (Backtrace): Document the new '-frame-info'
backtrace option.  Reference 'set print frame-info'.
(Print Settings): Document 'set|show print frame-info'.
Document new 'presence' value for 'set print frame-arguments.

Test 'set print frame-info|frame-arguments presence'.

Updated tests to test the new options and new values.
Test the default for print_what in python frame filtering.
Updated the tests impacted by the default in python frame filtering
which is now consistent with the backtrace command.

gdb/testsuite/ChangeLog
2019-07-29 Philippe Waroquiers <philippe.waroquiers@skynet.be>

* gdb.base/options.exp: Update backtrace - completion to
new option -frame-info.
* gdb.base/frame-args.exp: Test new 'frame-arguments presence'.
Test new 'set print frame-info'. Test backtrace -frame-info
overriding 'set print frame-info'.
* gdb.python/py-framefilter.exp: Test new 'frame-arguments presence'.
Test new 'set print frame-info'.
Verify consistency of backtrace with and without filters, with and
without -no-filters.
* gdb.python/py-framefilter-invalidarg.exp: Update to new print_what
default.

Implement 'set print frame-info|frame-arguments presence'.

New settings allow to better control what frame information is printed.

'set print frame-info' allows to override the default frame information
printed when a GDB command prints a frame.
The backtrace command has a new option -frame-info to override
this global setting.

It is now possible to have very short frame information by using the
new 'set print frame-arguments presence' and
'set print frame-info short-location'.

Combined with 'set print address off', a backtrace will only show
the essential information to see the function call chain, e.g.:
  (gdb) set print address off
  (gdb) set print frame-arguments presence
  (gdb) set print frame-info short-location
  (gdb) bt
  #0  break_me ()
  #1  call_me (...)
  #2  main ()
  (gdb)

This is handy in particular for big backtraces with functions having
many arguments.

Python frame filter printing logic has been updated to respect the new
setting in non MI mode.

Also, the default frame information printed was inconsistent when
backtrace was printing the frame information itself, or when the python
frame filtering code was printing the frame information.
This patch changes the default of python frame filtering to have a
consistent behaviour regarding printed frame-information, whatever
the presence/activity/matches of python filters.

2019-07-29  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

* frame.h (enum print_what): New value 'SHORT_LOCATION', update
comments.
(print_frame_info_auto, print_frame_info_source_line,
print_frame_info_location, print_frame_info_source_and_location,
print_frame_info_location_and_address, print_frame_info_short_location):
New declarations.
(struct frame_print_options): New member print_frame_info.
* extension.h (enum ext_lang_frame_args): New value CLI_PRESENCE.
* stack.h (get_user_print_what_frame_info): New declaration.
(frame_show_address): New declaration.
* stack.c (print_frame_arguments_choices): New value 'presence'.
(print_frame_info_auto, print_frame_info_source_line,
print_frame_info_location, print_frame_info_source_and_location,
print_frame_info_location_and_address, print_frame_info_short_location,
print_frame_info_choices, print_frame_info_print_what): New definitions.
(print_frame_args): Only print dots for args if print frame-arguments
is 'presence'.
(frame_print_option_defs): New element for "frame-info".
(get_user_print_what_frame_info): New function.
(frame_show_address): Make non static.  Move comment to stack.h.
(print_frame_info_to_print_what): New function.
(print_frame_info): Update comment.  Use fp_opts.print_frame_info
to decide what to print.
(backtrace_command_1): Handle the new print_frame_arguments_presence
value.
(_initialize_stack): Call add_setshow_enum_cmd for frame-info.
* python/py-framefilter.c (py_print_args): Handle CLI_PRESENCE.
(py_print_frame): In non-mi mode, use LOCATION as default for
print_what, similarly to frame information printed directly by
backtrace command. Handle frame-info user option in non MI mode.

[gdb/testsuite, 2/2] Fix gdb.linespec/explicit.exp with check-read1

When running gdb.linespec/explicit.exp with check-read1, we get:
...
(gdb) PASS: gdb.linespec/explicit.exp: set max-completions unlimited
break \a
-function
  ...
top
(gdb) PASS: gdb.linespec/explicit.exp: complete with no arguments
break
-function
...
top
(gdb) FAIL: gdb.linespec/explicit.exp: complete with no arguments (clearing input line)
...

The problem is that the send_gdb "\t\t" triggers completion twice:
...
        set tst "complete with no arguments"
        send_gdb "break \t"
        gdb_test_multiple "" $tst {
            "break \\\x07" {
                send_gdb "\t\t"
                gdb_test_multiple "" $tst {
...
}
clear_input_line $tst
...
but the following gdb_test_multiple only parses it once, so the second
completion is left for clear_input_line, which fails.

Fix this by triggering completion only once.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

* gdb.linespec/explicit.exp: Fix completion trigger for "complete with
no arguments".

[gdb/testsuite, 1/2] Fix gdb.linespec/explicit.exp with check-read1

When running gdb.linespec/explicit.exp with check-read1, we get:
...
(gdb) PASS: gdb.linespec/explicit.exp: complete unique file name: break -source "3explicit.c"
break -source exp^Glicit^G^M
explicit.c   explicit2.c  ^M
(gdb) FAIL: gdb.linespec/explicit.exp: complete non-unique file name
...

The problem is that we have a gdb_test_multiple where we match two regexps:
...
        set tst "complete non-unique file name"
        send_gdb "break -source exp\t"
        gdb_test_multiple "" $tst {
            -re "break -source exp\\\x07licit" {
                ...
            }

            -re "break -source exp\\\x07l" {
                # This pattern may occur when glibc debuginfo is installed.
...
            }
        }
...
but since second is a substring of the first, we'll usually match the first,
but with check-read1 we'll match the second.

Fix this by using a single regexp and merging the related code.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

* gdb.linespec/explicit.exp: Fix gdb_test_multiple regexps where second
is a substring of the first for "complete non-unique file name".

[gdb/testsuite] Fix python.exp with check-read1

when running python/python.exp with check-read1, we get:
...
(gdb) PASS: gdb.python/python.exp: prompt substitution readline - end
python gdb.prompt_hook = error_prompt^M
Python Exception <type 'exceptions.RuntimeError'> Python exception calledPASS: gdb.python/python.exp: set hook
: ^M
(gdb) PASS: gdb.python/python.exp: set the hook to default
python gdb.prompt_hook = None^M
(gdb) PASS: gdb.python/python.exp: set print-stack full for prompt error test
set python print-stack full^M
(gdb) FAIL: gdb.python/python.exp: set the hook
python gdb.prompt_hook = error_prompt^M
Traceback (most recent call last):^M
  File "<string>", line 3, in error_prompt^M
RuntimeError: Python exception called^M
(gdb) FAIL: gdb.python/python.exp: set the hook to default
...

The problem is that gdb_test_multiple here:
...
gdb_test_multiple "python gdb.prompt_hook = error_prompt" "set the hook" {
    -re "Python Exception (exceptions.RuntimeError|<(type 'exceptions.|class ')RuntimeError'>) Python excepti
on called.*" {
       pass "set hook"
    }
}
...
specifies a regexp that ends with ".*" but doesn't specify the expected
$gdb_prompt.

Consequently, due to check-read1, the ".*" is matched to "" and the remaining
$gdb_prompt  is read by the the following gdb_py_test_silent_cmd, which has
its own $gdb_prompt read by the following gdb_py_test_silent_cmd, which has
its own $gdb_prompt causing a mismatch for the following gdb_test_multiple:
...
gdb_test_multiple "python gdb.prompt_hook = error_prompt" "set the hook" {
    -re "Traceback.*File.*line.*RuntimeError.*Python exception called.*" {
        pass "set hook"
    }
}
...
which causes both FAILs.

The second gdb_test_multiple has the same problem as the first, but it happens
not to cause a FAIL because it's followed by a gdb_py_test_silent_cmd and a
clean_restart.

Fix the regexps in both gdb_test_multiple calls.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

* gdb.python/python.exp: Don't terminate gdb_test_multiple regexp
with ".*".

[gdb/testsuite] Fix mi-catch-cpp-exceptions.exp and mi-nonstop.exp with check-read1

With check-read1 we get:
...
FAIL: gdb.mi/mi-catch-cpp-exceptions.exp: check for stap probe in libstdc++
FAIL: gdb.mi/mi-nonstop.exp: probe for target remote
...

In both cases this is due to using gdb_test_multiple (which expects $gdb_prompt
by default) in combination with gdb using $gdb_mi_prompt, similar to the
problem fixed by commit d17725d72f "Don't expect gdb_prompt in
mi_skip_python_test".

Fix this by adding the $prompt_regexp argument to the gdb_test_multiple calls.

gdb/testsuite/ChangeLog:

2019-07-29 Tom de Vries <tdevries@suse.de>

* lib/gdb.exp (skip_libstdcxx_probe_tests_prompt, gdb_is_target_1):
Pass prompt_regexp parameter to gdb_test_multiple calls.

[gdb/testsuite] Fix gdb.base/maint.exp with check-read1

With gdb.base/maint.exp and check-read1, we get:
...
FAIL: gdb.base/maint.exp: maint print registers
...

Using this patch:
...
diff --git a/gdb/testsuite/gdb.base/maint.exp b/gdb/testsuite/gdb.base/maint.exp
index a7675ea215..b81d7ec660 100644
--- a/gdb/testsuite/gdb.base/maint.exp
+++ b/gdb/testsuite/gdb.base/maint.exp
@@ -81,7 +81,9 @@ gdb_test_multiple $test $test {
         exp_continue
     }
     -re "$gdb_prompt $" {
-        gdb_assert { $saw_registers && $saw_headers } $test
+       gdb_assert { $saw_headers } "$test: saw headers"
+       gdb_assert { $saw_registers } "$test: saw registers"
+       pass "$test: got prompt"
     }
}
...

We get more information:
...
PASS: gdb.base/maint.exp: maint print registers: saw headers
FAIL: gdb.base/maint.exp: maint print registers: saw registers
PASS: gdb.base/maint.exp: maint print registers: got prompt
...

The problem is that when matching:
...
(gdb) maint print registers^M
Name         Nr  Rel Offset    Size  Type            ^M
rax           0    0      0       8 int64_t         ^M
...
the regexp for $saw_headers ends in "\[\r\n\]+", which
allows it to match only the "\r".  The remaining "\n" then start the next line
to be matched, which doesn't match for the $saw_registers regexp since it
starts with "^\[^\r\n\]+".

Fix this by ending the regexps with "\r\n".

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

* gdb.base/maint.exp: Use "\r\n" instead of "\[\r\n\]+" in "maint
          print registers" regexps.

[gdb/testsuite] Fix gdb.base/define.exp with check-read1

When running gdb.base/define.exp with check-read1, we get:
...
show prompt^M
Gdb's prompt is "(gdb) ".^M
(gdb) PASS: gdb.base/define.exp: save gdb_prompt
set prompt $blah$ ^M
(blah) PASS: gdb.base/define.exp: set gdb_prompt
set prompt (gdb) PASS: gdb.base/define.exp: reset gdb_prompt
^M
(gdb) FAIL: gdb.base/define.exp: define do-define
...

The problem is that the "$gdb_prompt $" regexp here:
...
gdb_test_multiple "set prompt $prior_prompt " "reset gdb_prompt" {
    -re "$gdb_prompt $" {
        pass "reset gdb_prompt"
    }
}
...
triggers for the echoing of the command "set prompt $prior_prompt " rather
than for the prompt after the command has executed.

Fix this by changing the regexp to "\r\n$gdb_prompt $".

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

* gdb.base/define.exp: Add "\r\n" to "reset gdb_prompt" regexp.

[gdb/testsuite] Don't expect gdb_prompt in mi_skip_python_test

When running gdb.python/py-mi-events.exp with make check-read1, we get:
...
(gdb) ^M
python print ('test')^M
&"python print ('test')\n"^M
~"test\n"^M
^done^M
(gdb) FAIL: gdb.python/py-mi-events.exp: verify python support
^M
python print (sys.version_info[0])^M
&"python print (sys.version_info[0])\n"^M
~"2\n"^M
^done^M
(gdb) FAIL: gdb.python/py-mi-events.exp: check if python 3
^M
...

The FAILs happen as follows.

On one hand, skip_python_tests_prompt uses the prompt_regexp parameter for the
user_code argument of gdb_test_multiple:
...
proc skip_python_tests_prompt { prompt_regexp } {
    global gdb_py_is_py3k

    gdb_test_multiple "python print ('test')" "verify python support" {
-re "not supported.*$prompt_regexp" {
    unsupported "Python support is disabled."
    return 1
}
-re "$prompt_regexp" {}
    }

    gdb_test_multiple "python print (sys.version_info\[0\])" "check if python 3" {
-re "3.*$prompt_regexp" {
            set gdb_py_is_py3k 1
        }
-re ".*$prompt_regexp" {
            set gdb_py_is_py3k 0
        }
    }
...

On the other hand, gdb_test_multiple itself uses $gdb_prompt:
...
         -re "\r\n$gdb_prompt $" {
            if ![string match "" $message] then {
                fail "$message"
            }
            set result 1
        }
...

So when mi_skip_python_test calls skip_python_tests_prompt with prompt_regexp
set to $mi_gdb_prompt:
...
proc mi_skip_python_tests {} {
    global mi_gdb_prompt
    return [skip_python_tests_prompt "$mi_gdb_prompt$"]
}
...
and expect reads "(gdb) " and tries to match it (due to the READ1=1 setting),
the user_code regexps using $prompt_regexp (set to $mi_gdb_prompt) don't match,
but the $gdb_prompt regexp in gdb_test_multiple does match.

Fix this by adding a prompt_regexp parameter to gdb_test_multiple, and using the
parameter in skip_python_tests_prompt.

Tested gdb.python/py-mi-events.exp with make check READ1=1 x86_64-linux.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-29  Tom de Vries  <tdevries@suse.de>

PR gdb/24855
* lib/gdb.exp (gdb_test_multiple): Add prompt_regexp parameter.
(skip_python_tests_prompt): Add prompt_regexp argument to
gdb_test_multiple calls.

Support .gnu.lto_.lto section in ELF files (PR 24768).

bfd/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

PR 24768
* archive.c (_bfd_compute_and_write_armap): Come up with
report_plugin_err variable.
* bfd-in2.h (struct bfd): Add lto_slim_object flag.
* elf.c (struct lto_section): New.
(_bfd_elf_make_section_from_shdr): Parse content of
.gnu_lto_.lto section.
* elflink.c: Report error for a missing LTO plugin.
* linker.c (_bfd_generic_link_add_one_symbol): Likewise.

binutils/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

PR 24768
* nm.c (filter_symbols): Set report_plugin_err if
error is reported.
(display_rel_file): Report error for a missing LTO plugin.

gold/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

PR 24768
* layout.h (class Layout): Add is_lto_slim_object and
set_lto_slim_object.
* object.cc (struct lto_section): Add lto_slim_object_.
(big_endian>::do_layout): Parse content of
.gnu_lto_.lto section.
(big_endian>::do_add_symbols): Report error for a missing
LTO plugin.

Automatic date update in version.in

PR24857, ld: error adding symbols: bad value

This fixes two cases where elf_link_add_object_symbols returns an
error, setting the catch-all bfd_error_bad_value without explaining
the error.  The second one is an internal error that can only be
caused by a target elf_add_symbol_hook, so make that one abort.  The
first one is my PR24339 fix.  PR24339 is another of those fuzzing bugs
and the fix I made catches the problem when loading symbols, rather
than when symbols are used in relocs.  While ld is correct to reject
the object file as not complying with the ELF standard, let's be a
little more forgiving for dynamic objects.

PR 24857
PR 24339
* elflink.c (elf_link_add_object_symbols): Report an informative
error on finding local symbols with index equal or greater than
symbol table sh_info.  Correct comment.  Allow such symbols in
dynamic objects.  Abort on NULL section for symbol.

Add test that "file" shows "main"

This adds a new test that checks that the "file" command will show the
program's "main".

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* gdb.tui/main.exp: New file.

Add test case for empty TUI windows

My original intent here was to add a test case to test that empty TUI
windows re-render their contents after a resize. However, this seems
pretty broken at the moment, so a lot of the test is actually
disabled.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* lib/tuiterm.exp (Term::clean_restart): Make "executable"
optional.
* gdb.tui/empty.exp: New file.

Add TUI resizing test

This adds a test case that resizes the terminal and then checks that
the TUI updates properly.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* lib/tuiterm.exp (spawn): New proc.
(Term::resize): New proc.
* gdb.tui/resize.exp: New file.

Add TUI test for "list"

This adds a test to check that the "list" command will update the TUI
source window.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* gdb.tui/list.exp: New file.

Add TUI register window test

This adds a very simple test of the TUI register window.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* gdb.tui/regs.exp: New file.

Add "layout split" test

This adds a test of "layout split" to the TUI test suite.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* gdb.tui/basic.exp: Add "layout split" test.

Add test for "layout asm"

This adds a very simple test for "layout asm".

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* gdb.tui/basic.exp: Add "layout asm" test.

A virtual terminal for the test suite

This patch implements a simple ANSI terminal emulator for the test
suite. It is still quite basic, but it is good enough to allow some
simple TUI testing to be done.

gdb/testsuite/ChangeLog
2019-07-27 Tom Tromey <tom@tromey.com>

* lib/tuiterm.exp: New file.
* gdb.tui/basic.exp: New file.

Automatic date update in version.in

Fix gdb.python/py-thrhandle.exp failures for -m32 multilib

This patch fixes the following failures when testing with
"target_board unix/-m32" using a x86_64-pc-linux-gnu native GDB.

FAIL: gdb.python/py-thrhandle.exp: print thread for bogus handle thrs[3]
FAIL: gdb.python/py-thrhandle.exp: print thread for bogus handle thrs[4]
FAIL: gdb.python/py-thrhandle.exp: print thread id for thrs[0]
FAIL: gdb.python/py-thrhandle.exp: print thread id for thrs[1]
FAIL: gdb.python/py-thrhandle.exp: print thread id for thrs[2]
FAIL: gdb.python/py-thrhandle.exp: thread 0: fetch thread handle from thread
FAIL: gdb.python/py-thrhandle.exp: thread 0: verify that handles are the same
FAIL: gdb.python/py-thrhandle.exp: thread 1: fetch thread handle from thread
FAIL: gdb.python/py-thrhandle.exp: thread 1: verify that handles are the same
FAIL: gdb.python/py-thrhandle.exp: thread 2: fetch thread handle from thread
FAIL: gdb.python/py-thrhandle.exp: thread 2: verify that handles are the same

I've written it so that it might work for other 64-bit host / 32-bit target
combos too.

gdb/ChangeLog:

* linux-thread-db.c (thread_db_target::thread_handle_to_thread_info):
Add case for debugging 32-bit target on 64-bit host. Revise
comment.

Fix stepping bug associated with non-contiguous blocks

I recently noticed the following behavior while debugging
dw2-ranges-func-low-cold.  This is one of the test programs associated
with the test gdb.dwarf2/dw2-ranges-func.exp.

(gdb) b 70
Breakpoint 1 at 0x401129: file dw2-ranges-func-lo-cold.c, line 70.
(gdb) run
Starting program: dw2-ranges-func-lo-cold

Breakpoint 1, foo ()
    at dw2-ranges-func-lo-cold.c:70
70   if (e) foo_cold (); /* foo foo_cold call */
(gdb) set var e=1
(gdb) step
[Inferior 1 (process 12545) exited normally]

This is incorrect.  When stepping, we expect a step to occur.  We do not
expect the program to exit.  Instead, we should see the following behavior:

...
(gdb) set var e=1
(gdb) step
foo ()
    at dw2-ranges-func-lo-cold.c:54
54   baz (); /* foo_cold baz call */

(Note that I've shortened the paths in the above sessions to improve
readability.)

The bug is in fill_in_stop_func() in infrun.c.  While working on
non-contiguous address range improvements in 2018, I replaced the
call to find_pc_partial_function() with a call to
find_function_entry_range_from_pc().  Although this seemed like the
right thing to do at the time, I now think that calling
find_pc_partial_function (along with some other tweaks) is the right
thing to do.

For blocks with a single contiguous range, these functions do pretty
much the same thing: when the function succeeds, the function name,
start address, and end address are all filled in.  Additionally,
find_pc_partial_function contains an additional output parameter
which is set to the block containing that PC.

For blocks with non-contiguous ranges, find_pc_partial_function
sets the start and end addresses to the start and end addresses
of the range containing the pc.  find_function_entry_range_from_pc
does what it says; it sets the start and end addresses to those
of the range containing the entry pc.

The reason that I had thought that using the entry pc range was
correct is due to the fact that fill_in_stop_func() contains some
code for advancing past the function start and entry point.  To do
this, we'd need the range that contains the entry pc.

However, when stepping, we actually want the range that contains the
stop pc.  If that range also contains the entry pc, we should then
attempt to advance stop_func_start past the start offset and entry
point.  (I haven't thought very hard about the reason for advancing
the stop_func_start in this manner.  Since it's been there for quite
a while, I'm assuming that it's still a good idea.)

Back when I wrote the test case, I had included a test for doing the
step shown in the example above.  I had problems with it, however.  At
the time, I thought it was due to differing compiler versions, so I
disabled that portion of the test.  I have now reenabled those tests,
but have left in place the logic which may be used to disable it.

The changes to dw2-ranges-func.exp depend on my other recent changes
to the file which have not been pushed yet.

Finally, I'll note that the only caller of
find_function_entry_range_from_pc() is/was fill_in_stop_func().  Once
this commit goes in, it'll be dead code.  I considered removing it,
but I think that it ought to be used (instead of
find_pc_partial_function) for determining the correct range to scan
for prologue analysis, so I'm going to leave it in place for now.

gdb/ChangeLog:

* infrun.c (fill_in_stop_func): Use find_pc_partial_function
instead of find_function_entry_range_from_pc.

testsuite/ChangeLog:

* gdb.dwarf2/dw2-ranges-func.exp (enable_foo_cold_stepping):
Enable tests associated with this flag.  Adjust regex
referencing "foo_low" to now refer to "foo_cold" instead.

Improve test gdb.dwarf2/dw2-ranges-func.exp

The original dw2-ranges-func.exp test caused a function named foo to be
created with two non-contiguous address ranges.  In the C source file,
a function named foo_low was incorporated into the function foo which
was also defined in that file.  The DWARF assembler is used to do this
manipulation.  The source file had been laid out so that foo_low would
likely be placed (by the compiler and linker) at a lower address than
foo().

The case where a range at a higher set of addresses (than foo) was not
being tested.  In a recent discussion on gdb-patches, it became clear
that performing such tests are desirable because bugs were discovered
which only became evident when the other range was located at high(er)
addresses than the range containing the entry point for the function.

This other (non entry pc) address range is typically used for "cold"
code which executes less frequently.  Thus, I renamed foo_low to
foo_cold and renamed the C source file from dw-ranges-func.c to
dw-ranges-func-lo.c.  I then made a copy of this file, naming it
dw-ranges-func-hi.c.  (That was my intent anyway.  According to git,
I renamed dw-ranges-func.c to dw-ranges-func-hi.c and then modified it.
dw-ranges-func-lo.c shows up as an entirely new file.)

Within dw-ranges-func-hi.c, I changed the placement of foo_cold()
along with some of the other functions so that foo_cold() would be at
a higher address than foo() while also remaining non-contiguous.  The
two files, dw-ranges-func-lo.c and dw-ranges-func-hi.c, are
essentially the same except for the placement of some of the functions
therein.

The tests in dw2-ranges-func.exp where then wrapped in a new proc named
do_test which was then called in a loop from the outermost level.  The
loop causes each of the source files to have the same tests run upon
them.

I also added a few new tests which test functionality fixed by the other
commits to this patch series.  Due to the reorganization of the file,
it's hard to identify these changes in the patch.  So, here are the
tests which were added:

    with_test_prefix "no-cold-names" {

# Due to the calling sequence, this backtrace would normally
# show function foo_cold for frame #1.  However, we don't want
# this to be the case due to placing it in the same block
# (albeit at a different range) as foo.  Thus it is correct to
# see foo for frames #1 and #2.  It is incorrect to see
# foo_cold at frame #1.
gdb_test_sequence "bt" "backtrace from baz" {
    "\[\r\n\]#0 .*? baz \$\$ "
    "\[\r\n\]#1 .*? foo \$\$ "
    "\[\r\n\]#2 .*? foo \$\$ "
    "\[\r\n\]#3 .*? main \$\$ "
}

# Doing x/2i foo_cold should show foo_cold as the first symbolic
# address and an offset from foo for the second.  We also check to
# make sure that the offset is not too large - we don't GDB to
# display really large offsets that would (try to) wrap around the
# address space.
set foo_cold_offset 0
set test "x/2i foo_cold"
gdb_test_multiple $test $test {
    -re "   (?:$hex) <foo_cold>.*?\n   (?:$hex) <foo\[+-\](\[0-9\]+)>.*${gdb_prompt}" {
        set foo_cold_offset $expect_out(1,string)
pass $test
    }
}
gdb_assert {$foo_cold_offset <= 10000} "offset to foo_cold is not too large"

# Likewise, verify that second address shown by "info line" is at
# and offset from foo instead of foo_cold.
gdb_test "info line *foo_cold" "starts at address $hex <foo_cold> and ends at $hex <foo\[+-\].*?>.*"

    }

When run against a GDB without the requisite bug fixes (from this patch
series), these 6 failures should be seen:

FAIL: gdb.dwarf2/dw2-ranges-func.exp: lo-cold: no-cold-names: backtrace from baz (pattern 4)
FAIL: gdb.dwarf2/dw2-ranges-func.exp: lo-cold: no-cold-names: x/2i foo_cold
FAIL: gdb.dwarf2/dw2-ranges-func.exp: lo-cold: no-cold-names: info line *foo_cold
FAIL: gdb.dwarf2/dw2-ranges-func.exp: hi-cold: no-cold-names: backtrace from baz (pattern 3)
FAIL: gdb.dwarf2/dw2-ranges-func.exp: hi-cold: no-cold-names: x/2i foo_cold
FAIL: gdb.dwarf2/dw2-ranges-func.exp: hi-cold: no-cold-names: info line *foo_cold

gdb/testsuite/ChangeLog:

* gdb.dwarf2/dw2-ranges-func.c: Rename to...
* gdb.dwarf2/dw2-ranges-func-lo-cold.c: ...this.
* gdb.dwarf2/dw2-ranges-func-lo-cold.c (foo_low): Change name to
foo_cold.  Revise comments to match.
* gdb.dwarf2/dw2-ranges-func-hi-cold.c: New file.
* gdb.dwarf2/dw2-ranges-func.exp (do_test): New proc. Existing tests
were wrapped into this proc; Call do_test in loop from outermost
level.
(foo_low): Rename all occurrences to "foo_cold".
(backtrace from baz): New test.
(x2/i foo_cold): New test.
(info line *foo_cold): New test.

dwarf2-frame.c: Fix FDE processing bug involving non-contiguous ranges

In the course of revising the test case for
gdb.dwarf2/dw2-ranges-func.exp, I added a new .c file which would
cause the "cold" range to be at a higher address than the rest of the
function.  In these tests, the range in question isn't really cold in
the sense that a compiler has determined that it'll be executed less
frequently.  Instead, it's simply the range that does not include the
entry pc.  These tests are intended to mimic the output of such a
compiler, so I'll continue to refer to this range as "cold" in the
following discussion.

The original test case had only tested a cold range placed
at lower addresses than the rest of the function.  During testing of the
new code where the cold range was placed at higher addresses, I found
that I could produce the following backtrace:

    (gdb) bt
    #0  0x0000000000401138 in baz ()
at dw2-ranges-func-hi-cold.c:72
    #1  0x0000000000401131 in foo_cold ()
at dw2-ranges-func-hi-cold.c:64
    #2  0x000000000040111e in foo ()
at dw2-ranges-func-hi-cold.c:50
    #3  0x0000000000401144 in main ()
at dw2-ranges-func-hi-cold.c:78

This is correct, except that we'd like to see foo() listed instead
of foo_cold().  (I handle that problem in another patch.)

Now look at what happens for a similar backtrace where the cold range
is at a lower address than the foo's entry pc:

    (gdb) bt
    #0  0x000000000040110a in baz ()
at dw2-ranges-func-lo-cold.c:48
    #1  0x0000000000401116 in foo ()
at dw2-ranges-func-lo-cold.c:54
    #2  0x00007fffffffd4c0 in ?? ()
    #3  0x0000000000401138 in foo ()
at dw2-ranges-func-lo-cold.c:70

Note that the backtrace doesn't go all the way back to main().  Moreover,
frame #2 is messed up.

I had seen this behavior when I had worked on the non-contiguous
address problem last year.  At the time I convinced myself that the
mangled backtrace was "okay" since we're doing strange things with
the DWARF assembler.  We're taking a function called foo_cold (though
it was originally called foo_low - my recent changes to the test case
changed the name) and via the magic of the DWARF assembler, we're
combining it into a separate (non-contiguous) range for foo.  Thus,
it was a surprise to me when I got a good and complete backtrace when
the cold symbol is placed at an address that's greater than entry pc.

The function dwarf2_frame_cache (in dwarf2-frame.c) is making this
call:

    if (get_frame_func_if_available (this_frame, &entry_pc)) ...

If that call succeeds (returns a true value), the FDE is then
processed up to the entry pc.  It doesn't make sense to do this,
however, when the FDE in question does not contain the entry pc.  This
can happen when the function in question is comprised of more than one
(non-contiguous) address range.

My fix is to add some comparisons to the test above to ensure that
ENTRY_PC is within the address range covered by the FDE.

gdb/ChangeLog:

* dwarf2-frame.c (dwarf2_frame_cache): Don't decode FDE instructions
for entry pc when entry pc is out of range for that FDE.

Restrict use of minsym names when printing addresses in disassembled code

build_address_symbolic contains some code which causes it to
prefer the minsym over the the function symbol in certain cases.
The cases where this occurs are the same as the "certain pathological
cases" that used to exist in find_frame_funname().

This commit largely disables that code; it will only prefer the
minsym when the address of minsym is identical to that of the address
under consideration AND the function address for the symbtab sym is
not the same as the address under consideration.

So, without this change, when using the dw2-ranges-func-lo-cold
executable from the gdb.dwarf2/dw2-ranges-func.exp test, GDB exhibits
the following behavior:

(gdb) x/5i foo_cold
   0x40110d <foo+4294967277>: push   %rbp
   0x40110e <foo+4294967278>: mov    %rsp,%rbp
   0x401111 <foo+4294967281>: callq  0x401106 <baz>
   0x401116 <foo+4294967286>: nop
   0x401117 <foo+4294967287>: pop    %rbp

On the other hand, still without this change, using the
dw2-ranges-func-hi-cold executable from the same test, GDB
does this instead:

(gdb) x/5i foo_cold
   0x401128 <foo_cold>: push   %rbp
   0x401129 <foo_cold+1>: mov    %rsp,%rbp
   0x40112c <foo_cold+4>: callq  0x401134 <baz>
   0x401131 <foo_cold+9>: nop
   0x401132 <foo_cold+10>: pop    %rbp

This is inconsistent behavior.  When foo_cold is at a lower
address than the function's entry point, the symtab symbol (foo)
is displayed along with a large positive offset which would wrap
around the address space if the address space were only 32 bits wide.
(A later patch fixes this problem by displaying negative offsets.)

This commit makes the behavior uniform for both the "lo-cold" and
"hi-cold" cases:

lo-cold:

(gdb) x/5i foo_cold
   0x40110d <foo_cold>: push   %rbp
   0x40110e <foo-18>: mov    %rsp,%rbp
   0x401111 <foo-15>: callq  0x401106 <baz>
   0x401116 <foo-10>: nop
   0x401117 <foo-9>: pop    %rbp

hi-cold:

(gdb) x/5i foo_cold
   0x401128 <foo_cold>: push   %rbp
   0x401129 <foo+35>: mov    %rsp,%rbp
   0x40112c <foo+38>: callq  0x401134 <baz>
   0x401131 <foo+43>: nop
   0x401132 <foo+44>: pop    %rbp

In both cases, the symbol shown for the address at which foo_cold
resides is shown as <foo_cold>.  Subsequent offsets are shown as
either negative or positive offsets from the entry pc for foo.

When disassembling a function, care must be taken to NOT display
<+0> as the offset for the second range.  For this reason, I found
it necessary to add the "prefer_sym_over_minsym" parameter to
build_address_symbolic.  The type of this flag is a bool; do_demangle
ought to be a bool also, so I made this change at the same time.

gdb/ChangeLog:

* valprint.h (build_address_symbolic): Add "prefer_sym_over_minsym"
parameter.  Change type of "do_demangle" to bool.
* disasm.c (gdb_pretty_print_disassembler::pretty_print_insn):
Pass suitable "prefer_sym_over_minsym" flag to
build_address_symbolic().  Don't output "+" for negative offsets.
* printcmd.c (print_address_symbolic): Update invocation of
build_address_symbolic to include a "prefer_sym_over_minsym"
flag.
(build_address_symbolic): Add "prefer_sym_over_minsym" parameter.
Restrict cases in which use of minimal symbol is preferred to that
of a found symbol.  Update comments.

Prefer symtab symbol over minsym for function names in non-contiguous blocks

The discussion on gdb-patches which led to this patch may be found
here:

https://www.sourceware.org/ml/gdb-patches/2019-05/msg00018.html

Here's a brief synopsis/analysis:

Eli Zaretskii, while debugging a Windows emacs executable, found
that functions comprised of more than one (non-contiguous)
address range were not being displayed correctly in a backtrace.  This
is the example that Eli provided:

  (gdb) bt
  #0  0x76a63227 in KERNELBASE!DebugBreak ()
     from C:\Windows\syswow64\KernelBase.dll
  #1  0x012e7b89 in emacs_abort () at w32fns.c:10768
  #2  0x012e1f3b in print_vectorlike.cold () at print.c:1824
  #3  0x011d2dec in print_object (obj=<optimized out>, printcharfun=XIL(0),
      escapeflag=true) at print.c:2150

The function print_vectorlike consists of two address ranges, one of
which contains "cold" code which is expected to not execute very often.
There is a minimal symbol, print_vectorlike.cold.65, which is the address
of the "cold" range.

GDB is prefering this minsym over the the name provided by the
DWARF info due to some really old code in GDB which handles
"certain pathological cases".  This comment reads as follows:

      /* In certain pathological cases, the symtabs give the wrong
function (when we are in the first function in a file which
is compiled without debugging symbols, the previous function
is compiled with debugging symbols, and the "foo.o" symbol
that is supposed to tell us where the file with debugging
symbols ends has been truncated by ar because it is longer
than 15 characters).  This also occurs if the user uses asm()
to create a function but not stabs for it (in a file compiled
with -g).

So look in the minimal symbol tables as well, and if it comes
up with a larger address for the function use that instead.
I don't think this can ever cause any problems; there
shouldn't be any minimal symbols in the middle of a function;
if this is ever changed many parts of GDB will need to be
changed (and we'll create a find_pc_minimal_function or some
such).  */

In an earlier version of this patch, I had left the code for the
pathological case intact, but those who reviwed that patch recommended
removing it.  So that's what I've done - I've removed it.

gdb/ChangeLog:

* stack.c (find_frame_funname): Remove code which preferred
minsym over symtab sym in "certain pathological cases".

Automatic date update in version.in

Fix return type typo in obsd-nat.c that breaks build on OpenBSD

To recap the bug report:
Commit a068643 introduced a small typo that breaks the gdb build on OpenBSD.
Line 38 of obsd-nat.c needs to be changed from std::sring to std::string.

gdb/ChangeLog
2019-07-26 Brian Callahan <bcallah@openbsd.org>

PR gdb/24839:
* gdb/obsd-nat.c (obsd_nat_target::pid_to_str): Fix typo in return
type.

[gdb/testsuite] Fix unterminated string in i386-pkru.exp

I ran into this error:
...
ERROR: tcl error sourcing gdb/testsuite/gdb.arch/i386-pkru.exp.
ERROR: missing "
    while executing
"untested ""
    invoked from within
"if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
     [list debug additional_flags=${comp_flags}]] } {
    untested "failed to c..."
    (file "gdb/testsuite/gdb.arch/i386-pkru.exp" line 25)
    invoked from within
...
caused by:
...
    untested "failed to compile x86 PKEYS test.
...

Fix the unterminated string.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-26  Tom de Vries  <tdevries@suse.de>

* gdb.arch/i386-pkru.exp: Fix unterminated string.

PR24798, buffer overflow in process_cu_tu_index

PR 24798
* dwarf.c (process_cu_tu_index): Avoid integer overflow on 64-bit
systems by casting ncols and nslots expressions to size_t. Display
number of columns and slots before giving up due to buffer overflow.
Use %u to display unsigned ints. Perform more pointer wrap tests.

Begone elf_linker

This field effectively became usused a long time ago, perhaps as early
as 1994.

* elf-bfd.h (struct output_elf_obj_tdata): Delete "linker" field.
(elf_linker): Don't define.
* elflink.c (bfd_elf_final_link): Don't set elf_linker.

Ajdust lto-3r and lto-5r tests for powerpc64

* testsuite/ld-plugin/lto-3r.d: Accept D for powerpc64 descriptors.
* testsuite/ld-plugin/lto-5r.d: Likewise.

Automatic date update in version.in