Commit Graph

44164 Commits

Author SHA1 Message Date
Richard Biener
258bf0ee37 [gdb] Speedup lnp_state_machine::handle_special_opcode
I see for some program at gdb startup:
...
Samples: 102K of event 'cycles:pu', Event count (approx.): 91710925103
Overhead  Command     Shared Object        Symbol
  15.21%  gdb         gdb                  [.]
lnp_state_machine::handle_special
...
where the divisions are the places we stall.  The following
micro-optimizes things but it smells like m_line_header->line_range
is constant, likewise probably m_line_header->maximum_ops_per_instruction
so eventually the divisions could be avoided completely with some
lookup table.

Well.  Micro-optimizing with this patch improves things
(don't expect [load] CSE over the gdbarch_adjust_dwarf2_line call).

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2020-02-14  Richard Biener  <rguenther@suse.de>

	* dwarf2/read.c (lnp_state_machine::handle_special_opcode): Apply CSE
	on expression with division operators.
2020-02-14 08:32:53 +01:00
Tom de Vries
8f432634a5 [gdb/testsuite] Remove stale exec in gdb_compile_ada
When running test-case gdb.ada/ptype_tagged_param.exp, I get:
...
PASS: gdb.ada/ptype_tagged_param.exp: compilation foo.adb
...

However, when I then de-install gnatmake and run again, I get the same result.
This is due to a stale exec. After removing the stale exec, I get:
...
UNSUPPORTED: gdb.ada/ptype_tagged_param.exp: compilation foo.adb
...

Fix this removing the stale exec in gdb_compile_ada before compilation.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-13  Tom de Vries  <tdevries@suse.de>

	* lib/ada.exp (gdb_compile_ada): Delete stale exec before compilation.
2020-02-13 15:42:07 +01:00
Tom de Vries
92b6eaf759 [gdb/testsuite] Add unsupported tests in catch_ex_std.exp
If I de-install gnatbind, I run into:
...
FAIL: gdb.ada/catch_ex_std.exp: gnatbind foo
...

Fix this by marking the test unsupported instead:
...
UNSUPPORTED: gdb.ada/catch_ex_std.exp: gnatbind foo
...

Likewise for gnatlink.

Tested on x86_64-linux, with and without gnatbind/gnatlink installed.

gdb/testsuite/ChangeLog:

2020-02-13  Tom de Vries  <tdevries@suse.de>

	* gdb.ada/catch_ex_std.exp: Indicate unsupported if gnatbind/gnatlink
	are missing.
2020-02-13 15:34:06 +01:00
Alok Kumar Sharma
f98a845896 Adding myself to gdb/MAINTAINERS
2020-02-13  Alok Kumar Sharma  <AlokKumar.Sharma@amd.com>

	* MAINTAINERS (Write After Approval): Adding myself.

Change-Id: I2e6095a63247902f5fe23d58c2df8f995e41cf58
2020-02-13 16:26:11 +05:30
Tom de Vries
f3b0f7fe42 [gdb/testsuite] Fix gnatmake_version_at_least
After de-installing gnatmake, I get:
...
Running src/gdb/testsuite/gdb.ada/rename_subscript_param.exp ...
ERROR: tcl error sourcing src/gdb/testsuite/gdb.ada/rename_subscript_param.exp.
ERROR: couldn't execute "gnatmake": no such file or directory
    while executing
"exec $gnatmake --version"
    (procedure "gnatmake_version_at_least" line 4)
...

Fix this by wrapping the exec call in a catch call.

Tested with and withouth gnatmake installed on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-13  Tom de Vries  <tdevries@suse.de>

	* lib/ada.exp (gnatmake_version_at_least): Wrap exec call in a catch
	call.
2020-02-13 08:37:34 +01:00
Tom Tromey
d1437c0ea6 Remove some dead code from event-loop.c
This removes some dead code from event-loop.c.

This patch is from my old series to merge the gdb and gdbserver event
loops; but since it is just removing dead code, it seemed simple to
commit it separately.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* event-loop.c (event_data, gdb_event, event_handler_func):
	Remove.
2020-02-12 17:16:50 -07:00
Tom Tromey
3d4560f707 Move the frame data to the BFD when possible
Now that comp_unit and the remaining frame data are all independent of
the objfile, it can all be stored on the BFD and shared across
inferiors.

As with other code doing this same thing, care must be taken to not
share the data when the objfile requires relocations.  So, two keys
are used: one for the BFD and one for the objfile, and
gdb_bfd_requires_relocations is used to differentiate between the two
cases.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (dwarf2_frame_bfd_data): New global.
	(dwarf2_frame_objfile_data): Add comment.
	(find_comp_unit, set_comp_unit): New functions.
	(dwarf2_frame_find_fde): Use find_comp_unit.
	(dwarf2_build_frame_info): Use set_comp_unit.
2020-02-12 15:51:58 -07:00
Tom Tromey
2198230456 Remove the objfile backlink from comp_unit
This removes the objfile backlink from comp_unit.  The only remaining
uses involved fetching the text offset from the objfile.  However,
this is already conveniently computed at all the sites that call
execute_cfa_program, and so it can simply be passed in.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (struct comp_unit) <objfile>: Remove.
	(comp_unit): Don't initialize objfile.
	(execute_cfa_program): Add text_offset parameter.
	(execute_cfa_program_test, dwarf2_fetch_cfa_info)
	(dwarf2_frame_cache): Update.
	(dwarf2_build_frame_info): Don't set "objfile" member.
2020-02-12 15:51:58 -07:00
Tom Tromey
4debb23796 Remove a use of the comp_unit backlink
The DWARF frame comp_unit object still has a backlink to the objfile.
In order to be truly objfile-independent, this must be removed.

This patch removes one such use, by passing the gdbarch to
decode_frame_entry directly.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (decode_frame_entry_1): Add gdbarch parameter.
	(decode_frame_entry): Likewise.
	(dwarf2_build_frame_info): Update.
2020-02-12 15:51:58 -07:00
Tom Tromey
0d404d447a Add per-unit obstack
This adds an auto_obstack to the DWARF frame comp_unit object, and
then changes the remaining code here to use the comp_unit obstack
rather than the objfile obstack.

At this point, all the storage for frame data is self-contained --
that is, it is independent of the objfile.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (struct comp_unit) <obstack>: New member.
	(decode_frame_entry_1): Use the comp_unit obstack.
2020-02-12 15:51:58 -07:00
Tom Tromey
a7a3ae5c02 Store the comp_unit instead of the FDE table
This changes the DWARF frame code to store the comp_unit on the
objfile, rather than storing the FDE table.  It also changes the
comp_unit to be heap-allocated using "new".

This change makes it simpler for a later patch to add a field to the
comp_unit, and to have deallaction work properly.  This in turn is
important for making the frame data be independent of the objfile.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (struct comp_unit): Add initializers and
	constructor.
	(dwarf2_frame_objfile_data): Store a comp_unit.
	(dwarf2_frame_find_fde): Update.
	(dwarf2_build_frame_info): Use "new".
2020-02-12 15:51:58 -07:00
Tom Tromey
a9d6541862 Change fde table to a vector
This removes struct dwarf2_fde_table, replacing it with a typedef of
std::vector.  This simplifies the code somewhat.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.c (struct dwarf2_fde_table): Remove.
	(dwarf2_fde_table): Typedef for std::vector.
	(dwarf2_frame_objfile_data): Remove the deleter.  Now static.
	(dwarf2_frame_find_fde, add_fde, decode_frame_entry_1)
	(decode_frame_entry): Update.
	(dwarf2_build_frame_info): Use "new".
2020-02-12 15:51:58 -07:00
Christian Biesinger
7559c21717 Change booleans to bool in ARM's gdbarch_tdep
gdb/ChangeLog:

2020-02-12  Christian Biesinger  <cbiesinger@google.com>

	* arm-tdep.c (arm_gdbarch_init): Update.
	* arm-tdep.h (struct gdbarch_tdep) <have_fpa_registers,
	have_wmmx_registers, have_vfp_pseudos, have_neon_pseudos,
	have_neon, is_m>: Change to bool.
2020-02-12 16:49:08 -06:00
Christian Biesinger
aeefc73cb2 Print more information in arm_dump_tdep
I am keeping the (int) casts because a future patch will change the type
to bool.

gdb/ChangeLog:

2020-02-12  Christian Biesinger  <cbiesinger@google.com>

	* arm-tdep.c (arm_dump_tdep): Print more fields of tdep.
2020-02-12 16:28:48 -06:00
Tom Tromey
d27b8e5f14 Remove dwarf_expr_baton
The type dwarf_expr_baton is unused and can be removed.

gdb/ChangeLog
2020-02-12  Tom Tromey  <tom@tromey.com>

	* dwarf2/loc.c (struct dwarf_expr_baton): Remove.

Change-Id: Id8342da31398b9b4b08f31be7c3d612e9590bbbf
2020-02-12 14:41:33 -07:00
Hannes Domani
cd5900f33b Cache the Thread Local Base pointer type in the gdbarch
gdb/ChangeLog:

2020-02-12  Hannes Domani  <ssbssa@yahoo.de>

	* windows-tdep.c (struct windows_gdbarch_data): Add tib_ptr_type.
	(windows_get_tlb_type): Use windows_gdbarch_data->tib_ptr_type.
2020-02-12 17:02:35 +01:00
Tom de Vries
38de8abe21 [gdb] Fix -Wstrict-null-sentinel warning (--with-iconv-bin)
When using configure flag --with-iconv-bin=$(which iconv), we run into:
...
gdb/charset.c: In function 'void find_charset_names()':
gdb/charset.c:821:75: error: missing sentinel in function call [-Werror=format=]
     iconv_program = concat (iconv_dir.c_str(), SLASH_STRING, "iconv", NULL);
                                                                           ^
cc1plus: all warnings being treated as errors
...

Fix the warning.

Build and reg-tested on x86_64-linux.

2020-02-12  Lukas Durfina  <ldurfina@tachyum.com>
	    Tom de Vries  <tdevries@suse.de>

	* charset.c (find_charset_names): Cast concat NULL sentinel to char *.
2020-02-12 11:15:33 +01:00
Tom Tromey
f056b22b92 Update a comment in psymtab.h
This updates a comment in psymtab.h to reflect the current reality.

gdb/ChangeLog
2020-02-11  Tom Tromey  <tom@tromey.com>

	* psymtab.h: Update comment.

Change-Id: I438bb5929c3ebd1a4c6e9a902490f2ef63014ab3
2020-02-11 18:11:32 -07:00
Tom Tromey
f92ff6b552 Don't allow copying of auto_obstack
Add DISABLE_COPY_AND_ASSIGN to struct auto_obstack, to prevent copying
it.  Copying an auto_obstack would be a bug.

2020-02-11  Tom Tromey  <tom@tromey.com>

	* gdb_obstack.h (struct auto_obstack): Use
	DISABLE_COPY_AND_ASSIGN.

Change-Id: Ic9e5ab20acfcfa61c241fed4d99bbb1caefba3cd
2020-02-11 17:57:46 -07:00
Tom Tromey
3fd6912bb1 Don't forward-declare struct objfile in dwarf2/frame.h
dwarf2/frame.h forward-declares struct objfile, but there's no need
for this.

gdb/ChangeLog
2020-02-11  Tom Tromey  <tom@tromey.com>

	* dwarf2/frame.h (struct objfile): Don't forward declare.

Change-Id: I4d54d46ac9422eeb64dc5f0b934792e77a875aa5
2020-02-11 17:57:46 -07:00
Christian Biesinger
69ed9b74b6 Remove use of deprecated_add_core_fns in cris_tdep.c
The non-deprecated equivalent is implementing the gdbarch function
iterate_over_regset_sections, this patch does that.

Tested by generating a core file on cris under qemu and comparing
the output of "info registers".

This also fixes this warning when loading cris core files:
  warning: Unexpected size of section `.reg/164' in core file.

gdb/ChangeLog:

2020-02-11  Christian Biesinger  <cbiesinger@google.com>

	* cris-tdep.c (cris_supply_gregset): Change signature to match
	what struct regset expects.
	(cris_regset): New struct.
	(fetch_core_registers): Remove.
	(cris_iterate_over_regset_sections): New function.
	(_initialize_cris_tdep): Don't call deprecated_add_core_fns.
	(cris_gdbarch_init): Call set_gdbarch_iterate_over_regset_sections.

Change-Id: Ieef895b5a2fdc797d1a913cd1c0c07563edfe8e7
2020-02-11 10:40:05 -06:00
Sergio Durigan Junior
f6be87130b New testcase for PR tui/25126 (staled source cache)
I'm dealing with a Fedora GDB bug that is related to PR tui/25126, and
I thought I'd write a specific testcase for it because I couldn't find
one.

The idea is to get the simple reproducer from the bug and tweak the
testcase around it.  This one was a bit hard because, since we need to
modify the source file and recompile it, it involved a bit of TCL-foo
to do things.  Also for this reason, I'm only enabling the test for
native boards.

I tested this with an upstream GDB and made sure everything is
passing.  I also tested with a faulty GDB and made sure the test
failed.

gdb/testsuite/ChangeLog:
2020-02-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR tui/25126
	https://bugzilla.redhat.com/show_bug.cgi?id=1784210
	* gdb.base/cached-source-file.c: New file.
	* gdb.base/cached-source-file.exp: New file.

Change-Id: Ib1b074342ebe8613c6d1dfde631691ebdf6d81c6
2020-02-11 11:36:17 -05:00
Christian Biesinger
bda874f6d1 Add a comment for the ARM_F{0..7}_REGNUM registers
These are for the obsolete FPA architecture.

gdb/ChangeLog:

2020-02-11  Christian Biesinger  <cbiesinger@google.com>

	* arch/arm.h (enum gdb_regnum): Add comment for the FP0..7
	registers.

Change-Id: I6920616318ee637493d4ca12b91fa2ebcd103d76
2020-02-11 10:24:04 -06:00
Christian Biesinger
754e156431 Add missing \n in fprintf
gdb/ChangeLog:

2020-02-11  Christian Biesinger  <cbiesinger@google.com>

	* arm-tdep.c (arm_dump_tdep): Add \n in fprintf.

Change-Id: I0175572436cc7dec29e852c96371f85ea763ba2a
2020-02-11 10:22:33 -06:00
Simon Marchi
898e7f6078 Re-generate gdb/gdbserver/gdbsupport configure scripts
In my previous commit, I did a last minute modification of warning.m4,
but forgot to re-generate the configure scripts, this commit fixes that.

gdb/ChangeLog:

	* configure: Re-generate.

gdbserver/ChangeLog:

	* configure: Re-generate.

gdbsupport/ChangeLog:

	* configure: Re-generate.
2020-02-11 10:56:09 -05:00
Simon Marchi
8ddd8e0ed8 Add -Wstrict-null-sentinel to gdbsupport/warning.m4
Commit 85f0dd3ce ("[gdb] Fix -Wstrict-null-sentinel warnings") fixed
some violations of -Wstrict-null-sentinel.  If we want to enforce this
warning, I think we should enable it in our warning.m4 file.

gdbsupport/ChangeLog:

	* warning.m4: Add -Wstrict-null-sentinel.
	* configure: Re-generate.

gdbserver/ChangeLog:

	* configure: Re-generate.

gdb/ChangeLog:

	* configure: Re-generate.
2020-02-11 10:51:49 -05:00
Simon Marchi
58df732b21 Move gdb/warning.m4 to gdbsupport
This file is used by gdbsupport, gdbserver and gdb, so I think it
belongs in gdbsupport.  Move it there and update the references the
various acinclude.m4 files.

gdbsupport/ChangeLog:

	* warning.m4: Move here, from gdb/warning.m4.
	* acinclude.m4: Update warning.m4 path.
	* Makefile.in: Re-generate.

gdbserver/ChangeLog:

	* acinclude.m4: Update warning.m4 path.

gdb/ChangeLog:

	* acinclude: Update warning.m4 path.
	* warning.m4: Move to gdbsupport.
2020-02-11 10:51:43 -05:00
Tom Tromey
da5bd37ebc Remove some ui_file_* functions
This removes ui_file_isatty, ui_file_read, ui_file_write,
ui_file_write_async_safe, ui_file_flush, and ui_file_puts, replacing
them with calls to the appropriate method instead.

gdb/ChangeLog
2020-02-11  Tom Tromey  <tromey@adacore.com>

	* remote.c (remote_console_output): Update.
	* printcmd.c (printf_command): Update.
	* event-loop.c (gdb_wait_for_event): Update.
	* linux-nat.c (sigchld_handler): Update.
	* remote-sim.c (gdb_os_write_stdout): Update.
	(gdb_os_flush_stdout): Update.
	(gdb_os_flush_stderr): Update.
	(gdb_os_write_stderr): Update.
	* exceptions.c (print_exception): Update.
	* remote-fileio.c (remote_fileio_func_read): Update.
	(remote_fileio_func_write): Update.
	* tui/tui.c (tui_enable): Update.
	* tui/tui-interp.c (tui_interp::init): Update.
	* utils.c (init_page_info): Update.
	(putchar_unfiltered, fputc_unfiltered): Update.
	(gdb_flush): Update.
	(emit_style_escape): Update.
	(flush_wrap_buffer, fputs_maybe_filtered): Update.
	* ui-file.c (ui_file_isatty, ui_file_read, ui_file_write)
	(ui_file_write_async_safe, ui_file_flush, ui_file_puts): Remove.
	(stderr_file::write): Update.
	(stderr_file::puts): Update.
	* ui-file.h (ui_file_isatty, ui_file_write)
	(ui_file_write_async_safe, ui_file_read, ui_file_flush)
	(ui_file_puts): Don't declare.

Change-Id: I3ca9b36e9107f6adbc41e014f5078b41d6bcec4d
2020-02-11 07:05:28 -07:00
Tom de Vries
b2770d5e77 [gdb/testsuite] Fix UNRESOLVED in gdb.server/server-kill-python.exp
The test-case gdb.server/server-kill-python.exp runs fine by itself:
...
Running src/gdb/testsuite/gdb.server/server-kill-python.exp ...

                === gdb Summary ===

nr of expected passes            3
...

But if we run f.i. gdb.server/file-transfer.exp before it, we get instead:
...
Running src/gdb/testsuite/gdb.server/server-kill-python.exp ...
ERROR: GDB process no longer exists

                === gdb Summary ===

nr of expected passes            13
nr of unresolved testcases       1
...

We can see the origin of the problem here:
...
spawn gdbserver --once localhost:2347 \
  build/gdb/testsuite/outputs/gdb.server/file-transfer/file-transfer \
  build/gdb/testsuite/outputs/gdb.server/server-kill-python/server-kill-python^M
Process build/gdb/testsuite/outputs/gdb.server/file-transfer/file-transfer
  \ created; pid = 9464^M
Listening on port 2347^M
...

The spawn of the gdbserver for the server-kill-python test-case gets as
executable argument the file-transfer binary.

This is caused by proc gdbserver_spawn attempting to load the exec file in
$file_last_loaded.  This is something that is meant to load the same exec in
the gdbserver that was earlier loaded into gdb.

In this test-case however, nothing has been loaded into gdb by the test-case,
and consequently we load the file that was loaded into gdb in the previous
test-case.

Fix this by unsetting $file_last_loaded in gdb_init.

Build and reg-tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-11  Tom de Vries  <tdevries@suse.de>

	PR testsuite/25488
	* lib/gdb.exp (gdb_init): Unset $file_last_loaded.

Change-Id: Ic385e08cbd34cbf85518720cf5695b4ff6619f4b
2020-02-11 07:08:33 +01:00
Tom de Vries
85f0dd3ce8 [gdb] Fix -Wstrict-null-sentinel warnings
When passed in CXXFLAGS, -Wstrict-null-sentinel triggers twice in a
gdb/gdbserver build.

Fix the two occurrences.

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2020-02-10  Tom de Vries  <tdevries@suse.de>

	* dwarf2/read.c (process_psymtab_comp_unit_reader): Cast concat NULL
	sentinel to char *.

gdbsupport/ChangeLog:

2020-02-10  Tom de Vries  <tdevries@suse.de>

	* environ.c (gdb_environ::set): Cast concat NULL sentinel to char *.
2020-02-10 15:13:42 +01:00
Tom de Vries
44f6938ead [gdb/testsuite] Skip multi-target.exp without gdbserver
Pre-commit 919adfe840 "Move gdbserver to top level", if we build gdb with
--disable-gdbserver, and run test-case gdb.multi/multi-target.exp, we run
into:
...
(gdb) PASS: gdb.multi/multi-target.exp: continue: non-stop=off: set remote-exec file in inferior 2
spawn of  --once --multi localhost:2346 failed
ERROR: tcl error sourcing /data/gdb_versions/devel/src/gdb/testsuite/gdb.multi/multi-target.exp.
ERROR: Timeout waiting for gdbserver response.
...

Fix this by using skip_gdbserver_tests in multi-target.exp.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-10  Tom de Vries  <tdevries@suse.de>

	* gdb.multi/multi-target.exp: Skip if skip_gdbserver_tests.
2020-02-10 13:22:09 +01:00
Maciej W. Rozycki
5f0e2eb79e GDB/testsuite: Fix a catastrophic step-over-no-symbols.exp failure
Fix a catastrophic failure in gdb.base/step-over-no-symbols.exp where
remote target communication issues cause the value of the PC retrieved
to be empty:

(gdb) FAIL: gdb.base/step-over-no-symbols.exp: displaced=off: stepi
p /x $pc
Remote 'g' packet reply is too long (expected 264 bytes, got 532 bytes): 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
(gdb) FAIL: gdb.base/step-over-no-symbols.exp: displaced=off: get after PC
ERROR: tcl error sourcing .../gdb/testsuite/gdb.base/step-over-no-symbols.exp.
ERROR: missing operand at _@_
in expression " _@_!= "
    (parsing expression " != ")
    invoked from within
"expr $before_addr != $after_addr"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 expr $condition"
    (procedure "gdb_assert" line 6)
    invoked from within
"gdb_assert {$before_addr != $after_addr} "advanced""
    (procedure "test_step_over" line 36)
    invoked from within
"test_step_over $displaced"
    ("uplevel" body line 2)
    invoked from within
"uplevel 1 $body"
    invoked from within
"with_test_prefix "displaced=$displaced" {
	test_step_over $displaced
    }"
    ("foreach" body line 6)
    invoked from within
"foreach displaced { "off" "on" "auto" } {
    if { $displaced != "off" && ![support_displaced_stepping] } {
	continue
    }

    with_test_prefix "dis..."
    (file ".../gdb/testsuite/gdb.base/step-over-no-symbols.exp" line 84)
    invoked from within
"source .../gdb/testsuite/gdb.base/step-over-no-symbols.exp"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 source .../gdb/testsuite/gdb.base/step-over-no-symbols.exp"
    invoked from within
"catch "uplevel #0 source $test_file_name""
Remote debugging from host xxx.xxx.xxx.xxx, port 47130
monitor exit
Killing process(es): 1092
Remote communication error.  Target disconnected.: Connection reset by peer.
(gdb)

To do so verify first, before making an arithmetic comparison, that the
values to compare are actually integers (using a string comparison would
result in a false PASS if both operands were empty, as in this case),
making the test script proceed normally:

(gdb) FAIL: gdb.base/step-over-no-symbols.exp: displaced=off: stepi
p /x $pc
Remote 'g' packet reply is too long (expected 264 bytes, got 532 bytes): 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
(gdb) FAIL: gdb.base/step-over-no-symbols.exp: displaced=off: get after PC
FAIL: gdb.base/step-over-no-symbols.exp: displaced=off: advanced
Remote debugging from host xxx.xxx.xxx.xxx, port 48404
monitor exit
Killing process(es): 1795
Remote communication error.  Target disconnected.: Connection reset by peer.
(gdb)

Note the double curly braces, to take advantage of `&&' operator's lazy
evaluation.

	gdb/testsuite/
	* gdb.base/step-over-no-symbols.exp: Verify that $before_addr
	and $after_addr are both integers before making a comparison.
2020-02-10 08:59:04 +00:00
Tom de Vries
2e9276136b [gdb] Mention CU offset for <artifical> if verbose
Say we're debugging a test-case with CUs with name "<artificial>", meaning
not originating from a single file compilation, and use the verbose setting:
...
$ gdb -iex "set verbose on" -batch cc1
Reading symbols from cc1...
Reading in symbols for <artificial>... \
  and /tmp/trunk/gcc/attribs.c... \
  ...
  and /tmp/trunk/gcc/tree-ssa-reassoc.c... \
  done.
...

From the "/tmp/trunk/gcc/attribs.c" message, it's clear which CU is loaded.  But
that's not the case for the "<artificial>" message.

The message uses the filename field of struct partial_symtab, which is
documented like this:
...
  /* Name of the source file which this partial_symtab defines,
     or if the psymtab is anonymous then a descriptive name for
     debugging purposes, or "".  It must not be NULL.  */
...

So, fix this by setting the filename field to a more descriptive name than
"<artificial>", by appending the CU offset.

This way, we print instead:
...
$ gdb -iex "set verbose on" -batch cc1
Reading symbols from cc1...
Reading in symbols for <artificial>@0x41146d9 \
  and /tmp/trunk/gcc/attribs.c... \
  ... \
  and /tmp/trunk/gcc/tree-ssa-reassoc.c... \
  done.
...

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2020-02-09  Tom de Vries  <tdevries@suse.de>

	* dwarf2read.c (process_psymtab_comp_unit_reader): Append CU offset to
	filename if it matches "<artificial>".
2020-02-09 13:32:26 +01:00
Tom de Vries
46ce2b6f4c [gdb/testsuite] Capture many-headers.exp progress and output in gdb.log
When running test-case gdb.base/many-headers.exp, we have test output on
stdout/stderr:
...
Running src/gdb/testsuite/gdb.base/many-headers.exp ...
[New LWP 759]
Core was generated by `outputs/gdb.base/many-headers/many'.
Program terminated with signal SIGSEGV, Segmentation fault.
\#0  0x0000000000400688 in ?? ()

                === gdb Summary ===

nr of expected passes            1
...

Furthermore, the only trace in gdb.log that we have of the gdb command issued
is:
...
PASS: gdb.base/many-headers.exp: read core file
...

Fix this by echoing the gdb command in gdb.log, and capturing the
command output and pasting it into gdb.log:
...
( ulimit -s 4096; \
  gdb -nw -nx -data-directory data-directory -batch -core=many-headers.core )
[New LWP 1542]
Core was generated by `many'.
Program terminated with signal SIGSEGV, Segmentation fault.
\#0  0x0000000000400688 in ?? ()
PASS: gdb.base/many-headers.exp: read core file
...

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-09  Tom de Vries  <tdevries@suse.de>

	* gdb.base/many-headers.exp: Echo gdb command to gdb.log.  Capture gdb
	command output and paste it into gdb.log.  If any, paste catch message
	to gdb.log.
2020-02-09 13:30:03 +01:00
Hannes Domani
6bafc8451e Use enums for human-readable exception information.
Changes to $_siginfo type to this:

(gdb) pt $_siginfo
type = struct EXCEPTION_RECORD {
    enum ExceptionCode ExceptionCode;
    DWORD ExceptionFlags;
    struct EXCEPTION_RECORD *ExceptionRecord;
    PVOID ExceptionAddress;
    DWORD NumberParameters;
    union {
        ULONG_PTR ExceptionInformation[15];
        struct {...} AccessViolationInformation;
    };
}
(gdb) pt $_siginfo.ExceptionCode
type = enum ExceptionCode {FATAL_APP_EXIT = 1073741845,
    DBG_CONTROL_C = 1073807365, DBG_CONTROL_BREAK = 1073807368,
    DATATYPE_MISALIGNMENT = 2147483650, BREAKPOINT, SINGLE_STEP,
    ACCESS_VIOLATION = 3221225477, IN_PAGE_ERROR,
    ILLEGAL_INSTRUCTION = 3221225501, NONCONTINUABLE_EXCEPTION = 3221225509,
    INVALID_DISPOSITION, ARRAY_BOUNDS_EXCEEDED = 3221225612,
    FLOAT_DENORMAL_OPERAND, FLOAT_DIVIDE_BY_ZERO, FLOAT_INEXACT_RESULT,
    FLOAT_INVALID_OPERATION, FLOAT_OVERFLOW, FLOAT_STACK_CHECK,
    FLOAT_UNDERFLOW, INTEGER_DIVIDE_BY_ZERO, INTEGER_OVERFLOW,
    PRIV_INSTRUCTION, STACK_OVERFLOW = 3221225725, FAST_FAIL = 3221226505}
(gdb) pt $_siginfo.AccessViolationInformation
type = struct {
    enum ViolationType Type;
    PVOID Address;
}
(gdb) pt $_siginfo.AccessViolationInformation.Type
type = enum ViolationType {READ_ACCESS_VIOLATION, WRITE_ACCESS_VIOLATION,
    DATA_EXECUTION_PREVENTION_VIOLATION = 8}

Which makes it easier to understand the reason of the exception:

(gdb) p $_siginfo
$1 = {
  ExceptionCode = ACCESS_VIOLATION,
  ExceptionFlags = 0,
  ExceptionRecord = 0x0,
  ExceptionAddress = 0x401632 <main+18>,
  NumberParameters = 2,
  {
    ExceptionInformation = {1, 291, 0 <repeats 13 times>},
    AccessViolationInformation = {
      Type = WRITE_ACCESS_VIOLATION,
      Address = 0x123
    }
  }
}

gdb/ChangeLog:

2020-02-09  Hannes Domani  <ssbssa@yahoo.de>

	* windows-tdep.c (struct enum_value_name): New struct.
	(create_enum): New function.
	(windows_get_siginfo_type): Create and use enum types.
2020-02-09 12:15:50 +01:00
Hannes Domani
7928d571c5 Display ExceptionRecord for $_siginfo
Uses the $_siginfo convenience variable to show the last exception.

The type looks like this:

(gdb) pt $_siginfo
type = struct EXCEPTION_RECORD {
    DWORD ExceptionCode;
    DWORD ExceptionFlags;
    struct EXCEPTION_RECORD *ExceptionRecord;
    PVOID ExceptionAddress;
    DWORD NumberParameters;
    ULONG_PTR ExceptionInformation[15];
}

EXCEPTION_RECORD is documented at [1].

Example:

Program received signal SIGSEGV, Segmentation fault.
main () at crasher.c:4
4         *(int*)0x123 = 0;
(gdb) p $_siginfo
$1 = {
  ExceptionCode = 3221225477,
  ExceptionFlags = 0,
  ExceptionRecord = 0x0,
  ExceptionAddress = 0x401632 <main+18>,
  NumberParameters = 2,
  ExceptionInformation = {1, 291, 0 <repeats 13 times>}
}
(gdb) p/x $_siginfo.ExceptionCode
$2 = 0xc0000005
(gdb) p/x $_siginfo.ExceptionInformation[1]
$3 = 0x123

And 0xc0000005 is the value of EXCEPTION_ACCESS_VIOLATION.

[1] https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_record

gdb/ChangeLog:

2020-02-09  Hannes Domani  <ssbssa@yahoo.de>

	* NEWS: Mention $_siginfo support for Windows.
	* windows-nat.c (handle_exception): Set siginfo_er.
	(windows_nat_target::mourn_inferior): Reset siginfo_er.
	(windows_xfer_siginfo): New function.
	(windows_nat_target::xfer_partial): Call windows_xfer_siginfo.
	* windows-tdep.c (struct windows_gdbarch_data): New struct.
	(init_windows_gdbarch_data): New function.
	(get_windows_gdbarch_data): New function.
	(windows_get_siginfo_type): New function.
	(windows_init_abi): Register windows_get_siginfo_type.
	(_initialize_windows_tdep): Register init_windows_gdbarch_data.

gdbserver/ChangeLog:

2020-02-09  Hannes Domani  <ssbssa@yahoo.de>

	* win32-low.c (win32_clear_inferiors): Reset siginfo_er.
	(handle_exception): Set siginfo_er.
	(win32_xfer_siginfo): New function.
2020-02-09 12:14:51 +01:00
Tom Tromey
6751ebaea0 Remove "keep" parameter from cutu_reader constructor
cutu_reader has a "keep" parameter, which is used to decide what to do
with a new CU when the reader is destroyed.  Most code does not try to
preserve the CU, so this patch removes this parameter and instead adds
a new method that users can call to preserve the CU on the chain.

gdb/ChangeLog
2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (class cutu_reader) <cutu_reader,
	init_tu_and_read_dwo_dies>: Remove "keep" parameter.
	<keep>: Declare method.
	<m_keep>: Remove member.
	<~cutu_reader>: Remove.
	(cutu_reader::init_tu_and_read_dwo_dies): Update.
	(cutu_reader::cutu_reader): Update.
	(cutu_reader::keep): Rename from ~cutu_reader.
	(process_psymtab_comp_unit, build_type_psymtabs_1)
	(process_skeletonless_type_unit, load_partial_comp_unit)
	(load_full_comp_unit, dwarf2_read_addr_index)
	(read_signatured_type): Update.

Change-Id: I859b1c64313569d76d46317c14e9b077ebc3a27b
2020-02-08 13:43:55 -07:00
Tom Tromey
135f543748 Simplify "want_partial_unit" handling
This changes the "want_partial_unit" parameters to have type bool, and
also removes the parameter from process_psymtab_comp_unit_reader.
This latter change seemed like an improvement, because it avoids a
pointless function call in the case where we are not planning to read
a partial unit.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (process_psymtab_comp_unit_reader): Remove
	"want_partial_unit" parameter.
	(process_psymtab_comp_unit): Change want_partial_unit to bool.
	Inline check for DW_TAG_partial_unit.
	(dwarf2_build_psymtabs_hard, scan_partial_symbols): Update.

Change-Id: I99e647f0c4faa3346e90a6e7bacc82af57eccff1
2020-02-08 13:43:24 -07:00
Tom Tromey
9f66ff1c8c Move two more functions to dwarf2/leb.h
This moves read_n_bytes and read_direct_string to be with the the
low-level value-reading code.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (read_n_bytes, read_direct_string): Move to
	read.c.
	* dwarf2/leb.h (read_n_bytes, read_direct_string): Move from
	read.c.

Change-Id: Id07bfa13d93c0ac1f47a385749a8f01f4755b818
2020-02-08 13:43:24 -07:00
Tom Tromey
c8a7a66fb7 Convert read_address to a method on comp_unit_head
This changes read_address to be a method on comp_unit_head.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (read_address): Move to comp-unit.c.
	(dwarf2_rnglists_process, dwarf2_ranges_process)
	(read_attribute_value, dwarf_decode_lines_1)
	(var_decode_location, decode_locdesc): Update.
	* dwarf2/comp-unit.c (comp_unit_head::read_address): Move from
	read.c.  Remove "cu" parameter.
	* dwarf2/comp-unit.h (struct comp_unit_head) <read_address>: New
	method.

Change-Id: Ibd6c7235f2e4d5fd88c272cfd2c3d3328618cc56
2020-02-08 13:43:24 -07:00
Tom Tromey
8266302dc3 Convert read_offset to method on comp_unit_head
This changes one of the read_offset overloads to be a method on
comp_unit_head.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (read_attribute_value, read_indirect_string)
	(read_indirect_line_string): Update.
	* dwarf2/comp-unit.c (read_offset): Remove.
	(read_comp_unit_head): Update.
	* dwarf2/comp-unit.h (struct comp_unit_head) <read_offset>: New
	method.
	(read_offset): Don't declare.

Change-Id: Ia595702a5748337b7c031352bc437956baab9990
2020-02-08 13:43:24 -07:00
Tom Tromey
4057dfde49 Create dwarf2/comp-unit.[ch]
This creates the new files dwarf2/comp-unit.[ch], moving
comp_unit_head and helpers to those files.  A couple of functions are
turned into methods, because it was convenient to do so now.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* Makefile.in (COMMON_SFILES): Add dwarf2/comp-unit.c.
	* dwarf2/read.c (struct comp_unit_head): Move to
	dwarf2/comp-unit.h.
	(enum class rcuh_kind): Move to comp-unit.h.
	(get_cu_length, offset_in_cu_p): Now methods on comp_unit_head.
	(read_comp_unit_head, error_check_comp_unit_head)
	(read_and_check_comp_unit_head): Move to comp-unit.c.
	(read_offset, dwarf_unit_type_name): Likewise.
	(create_debug_type_hash_table, read_cutu_die_from_dwo)
	(cutu_reader::cutu_reader, read_call_site_scope)
	(find_partial_die, follow_die_offset): Update.
	* dwarf2/comp-unit.h: New file, from dwarf2read.c.

Change-Id: Id961b9674c0081ed061083c8152c38b27b27388a
2020-02-08 13:43:24 -07:00
Tom Tromey
24aa364d60 Move read_offset_1 to leb.c
This moves read_offset_1 to leb.c, as it is a low-level data-reading
function.  It is also renamed to remove the "_1", because gdb can use
overloading now, and this is clearer.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (read_offset_1): Move to leb.c.
	(read_abbrev_offset, read_offset, dwarf_decode_line_header)
	(dwarf_decode_macro_bytes): Update.
	* dwarf2/leb.c (read_offset): Rename; move from read.c.
	* dwarf2/leb.h (read_offset): Declare.

Change-Id: I048140598acfa76eade2cc529ab7933d4b9ca0b3
2020-02-08 13:43:24 -07:00
Tom Tromey
2c7d5afccf Convert dwarf2_section_size to a method
This changes dwarf2_section_size to be a method on
dwarf2_section_info.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (dwarf2_section_size): Remove.
	(error_check_comp_unit_head, dwarf2_symbol_mark_computed):
	Update.
	* dwarf2/section.h (struct dwarf2_section_info) <get_size>: New method.

Change-Id: I12928fee5c84350ce98883e329357b86888d639b
2020-02-08 13:43:24 -07:00
Tom Tromey
4075cb2668 Unify read_initial_length implementations
There are two implementations of read_initial_length in gdb.  This
merges them and moves the resulting function to leb.c.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (read_initial_length): Move to leb.c.
	* dwarf2/leb.h (read_initial_length): Declare.
	* dwarf2/leb.c (read_initial_length): Move from read.c.  Add
	handle_nonstd parameter.
	* dwarf2/frame.c (read_initial_length): Remove.
	(decode_frame_entry_1): Update.

Change-Id: I34d37bad0f8a584bfa781432cba25e05e1bd5750
2020-02-08 13:43:24 -07:00
Tom Tromey
09ba997f32 Add some methods to dwarf2_per_cu_data
This changes a few helper functions to be methods on
dwarf2_per_cu_data.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/loc.c (dwarf2_find_location_expression)
	(dwarf_evaluate_loc_desc::get_tls_address)
	(dwarf_evaluate_loc_desc::push_dwarf_reg_entry_value)
	(rw_pieced_value, dwarf2_evaluate_loc_desc_full)
	(dwarf2_locexpr_baton_eval, dwarf2_evaluate_property)
	(dwarf2_compile_property_to_c)
	(dwarf2_loc_desc_get_symbol_read_needs)
	(dwarf2_compile_expr_to_ax, locexpr_describe_location)
	(locexpr_tracepoint_var_ref, locexpr_generate_c_location)
	(loclist_describe_location, loclist_tracepoint_var_ref)
	(loclist_generate_c_location): Update.
	* compile/compile-loc2c.c (do_compile_dwarf_expr_to_c): Update.
	* dwarf2/loc.h (dwarf2_per_cu_objfile, dwarf2_per_cu_addr_size)
	(dwarf2_per_cu_ref_addr_size, dwarf2_per_cu_offset_size)
	(dwarf2_per_cu_text_offset, dwarf2_version): Don't declare.
	* dwarf2/read.c (dwarf2_per_cu_data::objfile)
	(dwarf2_per_cu_data::addr_size)
	(dwarf2_per_cu_data::ref_addr_size)
	(dwarf2_per_cu_data::text_offset)
	(dwarf2_per_cu_data::addr_type): Now methods.
	(per_cu_header_read_in): Make per_cu "const".
	(dwarf2_version): Remove.
	(dwarf2_per_cu_data::int_type): Now a method.
	(dwarf2_per_cu_data::_addr_sized_int_type): Likewise.
	(set_die_type, read_array_type, read_subrange_index_type)
	(read_tag_string_type, read_subrange_type): Update.
	* dwarf2/read.h (struct dwarf2_per_cu_data) <addr_size,
	offset_size, ref_addr_size, text_offset, addr_type, version,
	objfile, int_type, addr_sized_int_type>: Declare methods.

Change-Id: I07a42fa26e00795352389fa7a0cc1c12997d26f7
2020-02-08 13:43:24 -07:00
Tom Tromey
96c738c02f Move dwarf2_per_cu_data::imported_symtabs earlier
This moves dwarf2_per_cu_data::imported_symtabs earlier, near where
the other data members are located.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.h (struct dwarf2_per_cu_data) <imported_symtabs>:
	Move earlier.

Change-Id: I314ddaa6f67c53a848e513b3f6d42913bd957833
2020-02-08 13:43:24 -07:00
Tom Tromey
8fdd972c30 Move DWARF line_header to new file
This moves the line_header class to a pair of new files, making
dwarf2/read.c somewhat smaller.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.h (dwarf_line_debug): Declare.
	* Makefile.in (COMMON_SFILES): Add dwarf2/line-header.c.
	* dwarf2/read.c: Move line_header code to new files.
	(dwarf_line_debug): No longer static.
	* dwarf2/line-header.c: New file.
	* dwarf2/line-header.h: New file.

Change-Id: I8d9d8a2398b4e888e20cc5dd68d041c28b5a06e3
2020-02-08 13:43:24 -07:00
Tom Tromey
0307581275 Change line_table methods to return unique_xmalloc_ptr
This changes the two new line_table methods to return
unique_xmalloc_ptr.  This removes a bit of manual memory management.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (struct line_header) <file_full_name,
	file_file_name>: Return unique_xmalloc_ptr.
	(line_header::file_file_name): Update.
	(line_header::file_full_name): Update.
	(dw2_get_file_names_reader): Update.
	(macro_start_file): Update.

Change-Id: I9442dba43882fb26097d0770a291eea2b03913a4
2020-02-08 13:43:24 -07:00
Tom Tromey
bb82240439 Change file_full_name and file_file_name methods
This changes file_full_name and file_file_name methods to be methods
on line_header.  This seems more clear to me.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (struct line_header) <file_full_name,
	file_file_name>: Declare methods.
	(dw2_get_file_names_reader): Update.
	(file_file_name): Now a method.
	(file_full_name): Likewise.
	(macro_start_file): Update.

Change-Id: I50d3e91665a9637c732e1e8d8e4263764c766d9c
2020-02-08 13:43:24 -07:00