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
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
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
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
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
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
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
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
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
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
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
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
dwarf_always_disassemble is only used in dwarf2/loc.c, so move the
definition and the command infrastructure to that file.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (dwarf_always_disassemble)
(show_dwarf_always_disassemble): Move to loc.c.
(_initialize_dwarf2_read): Move "always-disassemble" registration
to loc.c.
* dwarf2/read.h (dwarf_always_disassemble): Don't declare.
* dwarf2/loc.c (dwarf_always_disassemble): Move from read.c. Now
static.
(show_dwarf_always_disassemble): Move from read.c.
(_initialize_dwarf2loc): Move always-disassemble from read.c.
Change-Id: I33fb88112e98e583c3f4919d20e4d100f2ea0124
This changes dwarf2_per_objfile::quick_file_names_table to be an
htab_up. This just removes a bit of manual management.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (~dwarf2_per_objfile): Update.
(create_quick_file_names_table): Return htab_up.
(dw2_get_file_names_reader, dw2_forget_cached_source_info):
Update.
* dwarf2/read.h (struct dwarf2_per_objfile)
<quick_file_names_table>: Now htab_up.
Change-Id: I4ff2fce8b8af27f4bfe01a11b97a889edfd23151
abbrev_table::read increments cur_abbrev->num_attrs in the inner loop,
but there's no need to do this, as the information is already stored
in the temporary vector.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/abbrev.c (abbrev_table::read): Simplify.
Change-Id: I765f12850ffa1c6066e884bb22c94468d1abdba4
This changes abbrev_table to use an htab_up rather than an ad hoc,
bucket-based hash table.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/abbrev.c (abbrev_table): Move constructor from header.
Rewrite.
(abbrev_table::add_abbrev, abbrev_table::lookup_abbrev): Rewrite.
* dwarf2/abbrev.h (struct abbrev_info) <next>: Remove.
(abbrev_table::abbrev_table): No longer inline.
(ABBREV_HASH_SIZE): Remove.
(abbrev_table::m_abbrevs): Now an htab_up.
Change-Id: Icbaa8e49501f9c43218d6a81a7e8c4d3a77d65dc
This cleans up the DWARF abbrev_table API a bit, primarily by making
various methods and members private.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (read_cutu_die_from_dwo): Update.
(cutu_reader): Update.
(build_type_psymtabs_1): Update.
* dwarf2/abbrev.c (abbrev_table::read): Rename.
(abbrev_table::alloc_abbrev): Update.
* dwarf2/abbrev.h (abbrev_table_up): Move earlier.
(abbrev_table::read): New static method, renamed from
abbrev_table_read_table.
(abbrev_table::alloc_abbrev)
(abbrev_table::add_abbrev): Now private.
(abbrev_table::abbrev_table): Now private.
(abbrev_table::m_abbrev_obstack): Now private. Rename.
Change-Id: I320dca83b799f672909ae66f73b7aca266adbaf9
This changes dwarf2_per_objfile::die_type_hash to be an htab_up,
moving its contents off the objfile obstack.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (set_die_type, get_die_type_at_offset): Update.
* dwarf2/read.h (struct dwarf2_per_objfile) <die_type_hash>: Now
htab_up.
Change-Id: Ic651f99ebf71bf7ad2dc2880192adacf7b60964a
This changes dwp_file to use htab_up for the loaded_cus and loaded_tus
members. This lets us avoid allocating the contents of these hash
tables on the objfile obstack.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (struct dwp_file) <loaded_cus, loaded_tus>: Now
htab_up.
(lookup_dwo_unit_in_dwp): Update.
(allocate_dwp_loaded_cutus_table): Return htab_up. Don't allocate
on obstack.
Change-Id: Id61209bf5c6c6faa0c067195af31fbcf26813a3a
This changes allocate_dwo_file_hash_table so that it does not use the
objfile obstack to store the contents of the hash table.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (allocate_dwo_file_hash_table): Don't allocate on
obstack.
Change-Id: Ic20a618acc7277e56aa18580c68f75c793bef97b
This changes dwarf2_per_objfile::line_header_hash to be an htab_up,
and changes it to use heap allocation.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (~dwarf2_per_objfile): Don't delete
line_header_hash.
(handle_DW_AT_stmt_list): Update. Don't allocate on obstack.
* dwarf2/read.h (struct dwarf2_per_objfile) <line_header_hash>:
Change type to htab_up.
Change-Id: Icb148a270838c0f96f38fc4a28b5b77d067927b6
This changes dwarf2_per_objfile::type_unit_groups to be an htab_up,
again allowing us to move the memory used by the hash table from the
objfile obstack to the heap.
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (allocate_type_unit_groups_table): Return
htab_up. Don't allocate on obstack.
(get_type_unit_group, dwarf2_build_psymtabs_hard): Update.
* dwarf2/read.h (struct dwarf2_per_objfile) <type_unit_groups>:
Change type to htab_up.
Change-Id: Ia045df0ff3ec30aac813da5a9a2314a607ef7ec8
This changes dwarf2_per_objfile::signatured_types to be an htab_up.
This in turn lets us change it not to use the objfile obstack for
allocation; obstack allocation for hash tables is a bad practice
because it leads to excess memory use if the table is ever resized.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.h (struct dwarf2_per_objfile) <signatured_types>:
Change type to htab_up.
* dwarf2/read.c (create_signatured_type_table_from_index)
(create_signatured_type_table_from_debug_names)
(create_all_type_units, add_type_unit)
(lookup_dwo_signatured_type, lookup_signatured_type)
(process_skeletonless_type_unit): Update.
(create_debug_type_hash_table, create_debug_types_hash_table):
Change type of types_htab.
(allocate_signatured_type_table, allocate_dwo_unit_table): Return
htab_up. Don't allocate on obstack.
(create_cus_hash_table): Change type of cus_htab parameter.
(struct dwo_file) <cus, tus>: Now htab_up.
(lookup_dwo_signatured_type, lookup_dwo_cutu)
(process_dwo_file_for_skeletonless_type_units, lookup_dwo_cutu)
(queue_and_load_all_dwo_tus): Update.
* dwarf2/index-write.c (write_gdbindex): Update.
(write_debug_names): Update.
Change-Id: I290a209b96945fb5f415c82723b62830e9c4b467
This removes some queue-related globals from the DWARF reader, in
favor of a new member on dwarf2_per_objfile. Globals must be avoided
in this code, because they prevent multi-threading the reader.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.h (struct dwarf2_queue_item): Move from
dwarf2/read.c. Remove "next" member. Add constructor ntad
destructor.
(struct dwarf2_per_objfile) <queue>: New member.
* dwarf2/read.c (struct dwarf2_queue_item): Move to
dwarf2/read.h.
(dwarf2_queue, dwarf2_queue_tail): Remove.
(class dwarf2_queue_guard): Add parameter to constructor. Use
DISABLE_COPY_AND_ASSIGN.
<m_per_objfile>: New member.
<~dwarf2_queue_guard>: Rewrite.
(dw2_do_instantiate_symtab, queue_comp_unit, process_queue):
Update.
(~dwarf2_queue_item): New.
Change-Id: Ied1f6ff3691352a66c4709b0b2cba0588f49f79a
Many functions take a "has_children" parameter (either as an in- or
out-parameter). However, it seems to me that it makes more sense to
have "has_children" be an attribute of a DIE. Making this change
allows this parameter to be eliminated in many places.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (struct die_info) <has_children>: New member.
(dw2_get_file_names_reader): Remove has_children.
(dw2_get_file_names): Update.
(read_cutu_die_from_dwo): Remove has_children.
(cutu_reader::init_tu_and_read_dwo_dies)
(cutu_reader::cutu_reader): Update.
(process_psymtab_comp_unit_reader, build_type_psymtabs_reader):
Remove has_children.
(build_type_psymtabs_1, process_skeletonless_type_unit)
(load_partial_comp_unit, load_full_comp_unit): Update.
(create_dwo_cu_reader): Remove has_children.
(create_cus_hash_table, read_die_and_children): Update.
(read_full_die_1,read_full_die): Remove has_children.
(read_signatured_type): Update.
(class cutu_reader) <has_children>: Remove.
Change-Id: I0d3d51ae9379554a66032648d51124bba07f87b4
die_reader_specs::comp_dir is assigned but never read; this patch
removes it.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.c (struct die_reader_specs) <comp_dir>: Remove.
(init_cu_die_reader, read_cutu_die_from_dwo): Update.
Change-Id: I9818a2593197a6972cddec23cd2f3dd0ce28f580
There's no need to forward-declare struct die_info in dwarf2read.h.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.h (struct die_info): Don't declare.
Change-Id: I0b8dbf99558b9547d418cfd8ef387a21f7dfa660
die_info_ptr is not used and so can be removed.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.h (die_info_ptr): Remove typedef.
Change-Id: Ibd0a5ad55876dc96a35b658adc36348f01e48884
This changes attr_form_is_block to be a method. This is done
separately because, unlike the other attribute functions,
attr_form_is_block had special handling for the case where the
argument was NULL. This required auditing each call site; in most
cases, NULL was already ruled out, but in a few spots, an additional
check was needed.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.c (read_call_site_scope)
(handle_data_member_location, dwarf2_add_member_fn)
(mark_common_block_symbol_computed, read_common_block)
(attr_to_dynamic_prop, partial_die_info::read)
(var_decode_location, dwarf2_fetch_die_loc_sect_off)
(dwarf2_symbol_mark_computed, set_die_type): Update.
* dwarf2/attribute.h (struct attribute) <form_is_block>: Declare
method.
(attr_form_is_block): Don't declare.
* dwarf2/attribute.c (attribute::form_is_block): Now a method.
Change-Id: Idfb290c61d738301ab991666f43e0b9cf577b2ae
This moves the attribute-related code out of dwarf2read.c and into the
new files dwarf2/attribute.[ch].
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.c (struct attribute, DW_STRING)
(DW_STRING_IS_CANONICAL, DW_UNSND, DW_BLOCK, DW_SND, DW_ADDR)
(DW_SIGNATURE, struct dwarf_block, attr_value_as_address)
(attr_form_is_block, attr_form_is_section_offset)
(attr_form_is_constant, attr_form_is_ref): Move.
* dwarf2/attribute.h: New file.
* dwarf2/attribute.c: New file, from dwarf2read.c.
* Makefile.in (COMMON_SFILES): Add dwarf2/attribute.c.
Change-Id: I1ea4c146256a1b9e38b66f1c605d782a14eeded7
This moves the abbrev table code out of dwarf2read.c and into new
files dwarf2/abbrev.[ch].
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.c (abbrev_table_up, struct abbrev_info)
(struct attr_abbrev, ABBREV_HASH_SIZE, struct abbrev_table):
Move.
(read_cutu_die_from_dwo, build_type_psymtabs_1): Update.
(abbrev_table::alloc_abbrev, abbrev_table::add_abbrev)
(abbrev_table::lookup_abbrev, abbrev_table_read_table): Move to
abbrev.c.
* dwarf2/abbrev.h: New file.
* dwarf2/abbrev.c: New file, from dwarf2read.c.
* Makefile.in (COMMON_SFILES): Add dwarf2/abbrev.c.
Change-Id: I87911bc5297de4407587ca849fef8e8d19136c30
This moves some section-handling code from dwarf2read.c into new
files, dwarf2/section.[ch].
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.h (struct dwarf2_section_info, dwarf2_read_section):
Move to dwarf2/section.h.
* dwarf2read.c (get_containing_section, get_section_bfd_owner)
(get_section_bfd_section, get_section_name)
(get_section_file_name, get_section_id, get_section_flags)
(dwarf2_section_empty_p, dwarf2_read_section): Moe to
dwarf2/section.c.
* dwarf2/section.h: New file.
* dwarf2/section.c: New file, from dwarf2read.c.
* Makefile.in (COMMON_SFILES): Add dwarf2/section.c.
Change-Id: I9f8498094cf99d9521e9481622ce8adbd453daf4
This moves some scalar-unpacking code into a couple of new files,
dwarf2/leb.h and dwarf2/leb.c.
gdb/ChangeLog
2020-02-08 Tom Tromey <tom@tromey.com>
* dwarf2read.h (read_unsigned_leb128): Don't declare.
* dwarf2read.c (read_1_byte, read_1_signed_byte, read_2_bytes)
(read_2_signed_bytes, read_3_bytes, read_4_bytes)
(read_4_signed_bytes, read_8_bytes): Move to dwarf2/leb.h.
(read_unsigned_leb128, read_signed_leb128): Move to dwarf2/leb.c.
* dwarf2/leb.h: New file, from dwarf2read.c.
* dwarf2/leb.c: New file, from dwarf2read.c.
* dwarf2-frame.c (read_1_byte, read_4_bytes, read_8_bytes):
Remove.
* Makefile.in (CONFIG_SRC_SUBDIR): Add dwarf2.
(COMMON_SFILES): Add dwarf2/leb.c.
Change-Id: Idd19647686c8f959d226a95fdfca4db47c6e96d0
This patch redefines fputs_unfiltered in utils.c, with new behavior to
forward parameters to fputs_maybe_filtered. This makes
fputs_unfiltered identical to fputs_filtered, except filtering is
disabled.
Some callers of fputs_unfiltered have been updated to use ui_file_puts
where they were using other ui_file_* functions anyway for IO.
This fixes the problem I saw with \032\032post-prompt annotation being
flushed to stdout in the wrong order.
2020-02-05 Iain Buclaw <ibuclaw@gdcproject.org>
PR gdb/25190:
* gdb/remote-sim.c (gdb_os_write_stderr): Update.
* gdb/remote.c (remote_console_output): Update.
* gdb/ui-file.c (fputs_unfiltered): Rename to...
(ui_file_puts): ...this.
* gdb/ui-file.h (ui_file_puts): Add declaration.
* gdb/utils.c (emit_style_escape): Update.
(flush_wrap_buffer): Update.
(fputs_maybe_filtered): Update.
(fputs_unfiltered): Add function.
Change-Id: I17ed5078f71208344f2f8ab634a6518b1af6e213
Commit a0c1ffedc regressed certain cases coming from Eclipse.
See PR breakpoints/24915.
gdb/ChangeLog
2020-02-07 Tom Tromey <tromey@adacore.com>
PR breakpoints/24915:
* source.c (find_and_open_source): Do not check basenames_may_differ.
gdb/testsuite/ChangeLog
2020-02-07 Tom Tromey <tromey@adacore.com>
PR breakpoints/24915:
* gdb.base/annotate-symlink.exp: Use setup_xfail.
Change-Id: Iadbf42f35eb40c95ad32b2108ae25d8f199998bd
This patch moves gdbserver to the top level.
This patch is as close to a pure move as possible -- gdbserver still
builds its own variant of gnulib and gdbsupport. Changing this will
be done in a separate patch.
[v2] Note that, per Simon's review comment, this patch changes the
tree so that gdbserver is not built for or1k or score. This makes
sense, because there is apparently not actually a gdbserver port here.
[v3] This version of the patch also splits out some configury into a
new file, gdbserver/configure.host, so that the top-level configure
script can simply rely on it in order to decide whether gdbserver
should be built.
[v4] This version adds documentation and removes some unnecessary
top-level dependencies.
[v5] Update docs to mention "make all-gdbserver" and change how
top-level configure decides whether to build gdbserver, switching to a
single, shared script.
Tested by the buildbot.
ChangeLog
2020-02-07 Tom Tromey <tom@tromey.com>
Pedro Alves <palves@redhat.com>
* src-release.sh (GDB_SUPPORT_DIRS): Add gdbserver.
* gdbserver: New directory, moved from gdb/gdbserver.
* configure.ac (host_tools): Add gdbserver.
Only build gdbserver on certain systems.
* Makefile.in, configure: Rebuild.
* Makefile.def (host_modules, dependencies): Add gdbserver.
* MAINTAINERS: Add gdbserver.
gdb/ChangeLog
2020-02-07 Tom Tromey <tom@tromey.com>
* README: Update gdbserver documentation.
* gdbserver: Move to top level.
* configure.tgt (build_gdbserver): Remove.
* configure.ac: Remove --enable-gdbserver.
* configure: Rebuild.
* Makefile.in (distclean): Don't mention gdbserver.
Change-Id: I826b7565b54604711dc7a11edea0499cd51ff39e
The source_cache::ensure method may throw an exception through
the invocation of source_cache::get_plain_source_lines. This
happens when the source file is not found. The expected behaviour
of "ensure" is only returning "true" or "false" according to the
documentation in the header file.
So far, if gdb is in source layout and a file is missing, you see
some outputs like below:
,---------------------------------------------.
| test.c file is loaded in the source window. |
| |
| int main() |
| ... |
|---------------------------------------------|
| Remote debugging using :1234 |
| __start () at /path/to/crt0.S:141 |
| /path/to/crt0.S: No such file or directory. |
| (gdb) p/x $pc |
| $1 = 0x124 |
| (gdb) n |
| /path/to/crt0.S: No such file or directory. |
| (gdb) p/x $pc |
| $2 = 0x128 |
| (gdb) [pressing arrow-down key] |
| (gdb) terminate called after throwing an |
| instance of 'gdb_exception_error' |
`---------------------------------------------'
Other issues have been encountered as well [1].
The patch from Pedro [2] which is about preventing exceptions
from crossing the "readline" mitigates the situation by not
causing gdb crash, but still there are lots of errors printed:
,---------------------------------------------.
| test.c file is loaded in the source window. |
| |
| int main() |
| ... |
|---------------------------------------------|
| Remote debugging using :1234 |
| __start () at /path/to/crt0.S:141 |
| /path/to/crt0.S: No such file or directory. |
| (gdb) [pressing arrow-down key] |
| /path/to/crt0.S: No such file or directory. |
| (gdb) [pressing arrow-down key] |
| /path/to/crt0.S: No such file or directory. |
| (gdb) [pressing arrow-up key] |
| /path/to/crt0.S: No such file or directory. |
`---------------------------------------------'
With the changes of this patch, the behavior is like:
,---------------------------------------------.
| initially, source window is empty because |
| crt0.S is not found and according to the |
| program counter that is the piece of code |
| being executed. |
| |
| later, when we break at main (see commands |
| below), this window will be filled with the |
| the contents of test.c file. |
|---------------------------------------------|
| Remote debugging using :1234 |
| __start () at /path/to/crt0.S:141 |
| (gdb) p/x $pc |
| $1 = 0x124 |
| (gdb) n |
| (gdb) p/x $pc |
| $2 = 0x128 |
| (gdb) b main |
| Breakpoint 1 at 0x334: file test.c, line 8. |
| (gdb) cont |
| Continuing. |
| Breakpoint 1, main () at hello.c:8 |
| (gdb) n |
| (gdb) |
`---------------------------------------------'
There is no crash and the error message is completely
gone. Maybe it is good practice that the error is
shown inside the source window.
I tested this change against gdb.base/list-missing-source.exp
and there was no regression.
[1]
It has also been observed in the past that the register
values are not transferred from qemu's gdb stub, see:
https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/issues/226
[2]
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=2f267673f0fdee9287e6d404ecd4f2d29da0d2f2
gdb/ChangeLog:
* source-cache.c (source_cache::ensure): Surround
get_plain_source_lines with a try/catch.
(source_cache::get_line_charpos): Get rid of try/catch
and only check for the return value of "ensure".
* tui/tui-source.c (tui_source_window::set_contents):
Simplify "nlines" calculation.
gdb/testsuite/ChangeLog:
* gdb.tui/tui-missing-src.exp: Add the "missing source
file" test for the TUI.
This was a typo introduced in f6ac5f3d63.
Found by looking through NetBSD's GDB patches:
https://github.com/NetBSD/pkgsrc-wip/blob/master/gdb-netbsd/patches/patch-gdb_sparc-nat.h
This patch can't be tested on Linux because Linux does not use the
sparc_target template.
gdb/ChangeLog:
2020-02-05 Christian Biesinger <cbiesinger@google.com>
* sparc-nat.h (struct sparc_target) <xfer_partial>: Fix base class
function call.
Change-Id: I4fa88cbdc365efe89b84cc0619b60db38718d9ce
Makes the comment match the macro name in the #define/#ifdef.
gdb/ChangeLog:
2020-02-05 Christian Biesinger <cbiesinger@google.com>
* ppc-nbsd-tdep.h: Fix macro name in #endif comment.
Change-Id: If7b2e49e65495b8eb9ed7b6c9a11277579a93a05
In preparation for RISC-V/Linux `gdbserver' support factor out parts of
native target description determination code that can be shared between
the programs.
gdb/
* nat/riscv-linux-tdesc.h: New file.
* nat/riscv-linux-tdesc.c: New file, taking code from...
* riscv-linux-nat.c (riscv_linux_nat_target::read_description):
... here.
* configure.nat <linux> <riscv*>: Add nat/riscv-linux-tdesc.o to
NATDEPFILES.
We assign the simulator inferior a fake ptid. If this ptid is ever
set to null_ptid then we are going to run into problems - the
simulator ptid is what we return from gdbsim_target::wait, and this in
turn is used to look up the inferior data with a call to
find_inferior_pid, which asserts the pid is not 0 (which it is in
null_pid).
This commit adds an assert that the simulator's fake pid is not
null_ptid. There should be no user visible changes after this commit.
gdb/ChangeLog:
* remote-sim.c (sim_inferior_data::sim_inferior_data): Assert that
we don't set the fake simulator ptid to the null_ptid.
Change-Id: I6e08effe70e70855aea13c9caf4fd6913d5af56d
In the function f77_print_array_1, the variable 'i' which holds the
index is of datatype 'int', while bounds are of datatype LONGEST. Due to
size of int being smaller than LONGEST, the variable 'i' stores
incorrect values for high indexes (higher than max limit of int). Due
to this issue in sources, two abnormal behaviors are seen while printing
arrays with high indexes (please check array-bounds-high.f90) For high
indexes with negative sign, gdb prints empty array even if the array has
elements.
(gdb) p arr
$1 = ()
For high indexes with positive sign, gdb crashes. We have now changed
the datatype of 'i' to LONGEST which is same as datatype of bounds.
gdb/ChangeLog:
* f-valprint.c (f77_print_array_1): Changed datatype of index
variable to LONGEST from int to enable it to contain bound
values correctly.
gdb/testsuite/ChangeLog:
* gdb.fortran/array-bounds-high.exp: New file.
* gdb.fortran/array-bounds-high.f90: New file.
Change-Id: Ie2dce9380a249e634e2684b9c90f225e104369b7
Fix RISC-V native Linux support to handle a 64-bit FPU (FLEN == 64) with
both RV32 and RV64 systems, which is a part of the current Linux ABI for
hard-float systems, rather than assuming that (FLEN == XLEN) in target
description determination and that (FLEN == 64) in register access.
We can do better however and not rely on any particular value of FLEN
and probe for it dynamically, by observing that the PTRACE_GETREGSET
ptrace(2) call will only accept an exact regset size, and that will
reflect FLEN. Therefore iterate over the call in target description
determination with a geometrically increasing regset size until a match
is marked by a successful ptrace(2) call completion or we run beyond the
maximum size we can support.
Update register accessors accordingly, using FLEN determined to size the
buffer used for NT_PRSTATUS requests and then to exchange data with the
regcache.
Also handle a glibc bug where ELF_NFPREG is defined in terms of NFPREG,
however NFPREG is nowhere defined.
gdb/
* riscv-linux-nat.c [!NFPREG] (NFPREG): New macro.
(supply_fpregset_regnum, fill_fpregset): Handle regset buffer
offsets according to FLEN determined.
(riscv_linux_nat_target::read_description): Determine FLEN
dynamically.
(riscv_linux_nat_target::fetch_registers): Size regset buffer
according to FLEN determined.
(riscv_linux_nat_target::store_registers): Likewise.
When the command "info registers" (same as "info registers general"),
is issued, _all_ the registers from a tdesc XML are printed. This
includes the registers with empty register groups (set as "") which
are supposed to be only printed by "info registers all" (or "info
all-registers").
This bug got introduced after all the overhauls that the
tdesc_register_in_reggroup_p() went through. You can see that the
logic of tdesc_register_in_reggroup_p() did NOT remain the same after
all those changes:
git difftool c9c895b9666..HEAD -- gdb/target-descriptions.c
With the current implementation, when the reg->group is an empty
string, this function returns -1, while in the working revision
(c9c895b966), it returned 0. This patch makes sure that the 0 is
returned again.
The old implementation of tdesc_register_in_reggroup_p() returned
-1 when "reggroup" was set to "all_reggroups" at line 4 below:
1 tdesc_register_reggroup_p (...)
2 {
3 ...
4 ret = tdesc_register_in_reggroup_p (gdbarch, regno, reggroup);
5 if (ret != -1)
6 return ret;
7
8 return default_register_reggroup_p (gdbarch, regno, reggroup);
9 }
As a result, the execution continued at line 8 and the
default_register_reggroup_p(..., reggroup=all_reggroups) would
return 1. However, with the current implementation of
tdesc_register_in_reggroup_p() that allows checking against any
arbitrary group name, it returns 0 when comparing the "reg->group"
against the string "all" which is the group name for "all_reggroups".
I have added a special check to cover this case and
"info all-registers" works as expected.
gdb/ChangeLog:
* target-descriptions.c (tdesc_register_in_reggroup_p): Return 0
when reg->group is empty and reggroup is not.
Change-Id: I9eaf9d7fb36410ed5684ae652fe4756b1b2e61a3
ravenscar-thread.c needed a change to adapt to multi-target:
ravenscar_thread_target::mourn_inferior called the mourn_inferior
method on the target beneat -- but when the target beneath was the
remote target, this resulted in the ravenscar target being deleted.
Switching the order of the calls to unpush_target and the beneath's
mourn_inferior fixes this problem.
gdb/ChangeLog
2020-01-31 Tom Tromey <tromey@adacore.com>
* ravenscar-thread.c (ravenscar_thread_target::mourn_inferior):
Call beneath target's mourn_inferior after unpushing.
Change-Id: Ia80380515c403adc40505a6b3420c9cb35754370
In TUI mode, if the disassembly output for the program is less than
one screen long, then currently if the user scrolls down until on the
last assembly instruction is displayed and then tries to scroll up
using Page-Up, the display doesn't update - they are stuck viewing the
last line.
If the user tries to scroll up using the Up-Arrow, then the display
scrolls normally.
What is happening is on the Page-Up we ask GDB to scroll backward the
same number of lines as the height of the TUI ASM window. The back
scanner, which looks for a good place to start disassembling, fails to
find a starting address which will provide the requested number of new
lines before we get back to the original starting address (which is
not surprising, our whole program contains less than a screen height
of instructions), as a result the back scanner gives up and returns
the original starting address.
When we scroll with Up-Arrow we only ask the back scanner to find 1
new instruction, which it manages to do, so this scroll works.
The solution here is, when we fail to find enough instructions, to
return the lowest address we did manage to find. This will ensure we
jump to the lowest possible address in the disassembly output.
gdb/ChangeLog:
PR tui/9765
* tui/tui-disasm.c (tui_find_disassembly_address): If we don't
have enough lines to fill the screen, still return the lowest
address we found.
gdb/testsuite/ChangeLog:
PR tui/9765
* gdb.tui/tui-layout-asm-short-prog.S: New file.
* gdb.tui/tui-layout-asm-short-prog.exp: New file.
Change-Id: I6a6a7972c68a0559e9717fd8d82870b669a40af3
GDB has some commands ('+', '-', '<', and '>') for scrolling the SRC
and ASM TUI windows from the CMD window, however the help text for
these commands lists the arguments in the wrong order.
This commit updates the help text to match how GDB actually works, and
also extends the text to describe what the arguments mean, and what
the defaults are.
There should be no change in GDBs functionality after this commit.
gdb/ChangeLog:
* tui/tui-win.c (_initialize_tui_win): Update help text for '+',
'-', '<', and '>' commands.
Change-Id: Ib2624891de1f4ba983838822206304e4c3ed982e
While testing a GCC 10 build of our git HEAD, Sergio noticed an error
triggered by -Werror-stringop on
infcmd.c:construct_inferior_arguments. One of the things the function
does is calculate the length of the string that will hold the
inferior's arguments. GCC warns us that 'length' can be 0, which can
lead to undesired behaviour:
../../gdb/infcmd.c: In function 'char* construct_inferior_arguments(int, char**)':
../../gdb/infcmd.c:369:17: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
369 | result[0] = '\0';
| ~~~~~~~~~~^~~~~~
../../gdb/infcmd.c:368:33: note: at offset 0 to an object with size 0 allocated by 'xmalloc' here
368 | result = (char *) xmalloc (length);
| ~~~~~~~~^~~~~~~~
The solution here is to assert that 'argc' is greater than 0 on entry,
which makes GCC understand that the loops always run at least once,
and thus 'length' is always > 0.
Tested by rebuilding.
gdb/ChangeLog:
2020-01-29 Pedro Alves <palves@redhat.com>
Sergio Durigan Junior <sergiodj@redhat.com>
* infcmd.c (construct_inferior_arguments): Assert that
'argc' is greater than 0.
Change-Id: Ide8407cbedcb4921de1843a6a15bbcb7676c7d26
New in v3:
- Code cleanups based on reviews.
New in v2:
- Fixed misc problems based on reviews.
- Switched to using gdbarch_program_breakpoint_here_p as opposed to
gdbarch_insn_is_breakpoint.
- Fixed matching of brk instructions. Previously the mask was incorrect, which
was showing up as a few failures in the testsuite. Now it is clean.
- New testcase (separate patch).
- Moved program_breakpoint_here () to arch-utils.c and made it the default
implementation of gdbarch_program_breakpoint_here_p.
--
It was reported to me that program breakpoints (permanent ones inserted into
the code itself) other than the one GDB uses for AArch64 (0xd4200000) do not
generate visible stops when continuing, and GDB will continue spinning
infinitely.
This happens because GDB, upon hitting one of those program breakpoints, thinks
the SIGTRAP came from a delayed breakpoint hit...
(gdb) x/i $pc
=> 0x4005c0 <problem_function>: brk #0x90f
(gdb) c
Continuing.
infrun: clear_proceed_status_thread (process 14198)
infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: proceed: resuming process 14198
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
infrun: infrun_async(1)
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14198.14198.0 [process 14198],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: delayed software breakpoint trap, ignoring
infrun: no stepping, continue
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14198.14198.0 [process 14198],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: delayed software breakpoint trap, ignoring
infrun: no stepping, continue
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14198.14198.0 [process 14198],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: delayed software breakpoint trap, ignoring
infrun: no stepping, continue
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14198.14198.0 [process 14198],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: delayed software breakpoint trap, ignoring
infrun: no stepping, continue
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14198.14198.0 [process 14198],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
...
... which is not the case.
If the program breakpoint is one GDB recognizes, then it will stop when it
hits it.
(gdb) x/i $pc
=> 0x4005c0 <problem_function>: brk #0x0
(gdb) c
Continuing.
infrun: clear_proceed_status_thread (process 14193)
infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: proceed: resuming process 14193
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14193] at 0x4005c0
infrun: infrun_async(1)
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 14193.14193.0 [process 14193],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: random signal (GDB_SIGNAL_TRAP)
infrun: stop_waiting
infrun: stop_all_threads
infrun: stop_all_threads, pass=0, iterations=0
infrun: process 14193 not executing
infrun: stop_all_threads, pass=1, iterations=1
infrun: process 14193 not executing
infrun: stop_all_threads done
Program received signal SIGTRAP, Trace/breakpoint trap.
problem_function () at brk_0.c:7
7 asm("brk %0\n\t" ::"n"(0x0));
infrun: infrun_async(0)
Otherwise GDB will keep trying to resume the inferior and will keep
seeing the SIGTRAP's, without stopping.
To the user it appears GDB has gone into an infinite loop, interruptible only
by Ctrl-C.
Also, windbg seems to use a different variation of AArch64 breakpoint compared
to GDB. This causes problems when debugging Windows on ARM binaries, when
program breakpoints are being used.
The proposed patch creates a new gdbarch method (gdbarch_program_breakpoint_here_p)
that tells GDB whether the underlying instruction is a breakpoint instruction
or not.
This is more general than only checking for the instruction GDB uses as
breakpoint.
The existing logic is still preserved for targets that do not implement this
new gdbarch method.
The end result is like so:
(gdb) x/i $pc
=> 0x4005c0 <problem_function>: brk #0x90f
(gdb) c
Continuing.
infrun: clear_proceed_status_thread (process 16417)
infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: proceed: resuming process 16417
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 16417] at 0x4005c0
infrun: infrun_async(1)
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: 16417.16417.0 [process 16417],
infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
infrun: stop_pc = 0x4005c0
infrun: random signal (GDB_SIGNAL_TRAP)
infrun: stop_waiting
infrun: stop_all_threads
infrun: stop_all_threads, pass=0, iterations=0
infrun: process 16417 not executing
infrun: stop_all_threads, pass=1, iterations=1
infrun: process 16417 not executing
infrun: stop_all_threads done
Program received signal SIGTRAP, Trace/breakpoint trap.
problem_function () at brk.c:7
7 asm("brk %0\n\t" ::"n"(0x900 + 0xf));
infrun: infrun_async(0)
gdb/ChangeLog:
2020-01-29 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (BRK_INSN_MASK): Define to 0xffe0001f.
(BRK_INSN_MASK): Define to 0xd4200000.
(aarch64_program_breakpoint_here_p): New function.
(aarch64_gdbarch_init): Set gdbarch_program_breakpoint_here_p hook.
* arch-utils.c (default_program_breakpoint_here_p): Moved from
breakpoint.c.
* arch-utils.h (default_program_breakpoint_here_p): Moved from
breakpoint.h
* breakpoint.c (bp_loc_is_permanent): Changed return type to bool and
call gdbarch_program_breakpoint_here_p.
(program_breakpoint_here): Moved to arch-utils.c, renamed to
default_program_breakpoint_here_p, changed return type to bool and
simplified.
* breakpoint.h (program_breakpoint_here): Moved prototype to
arch-utils.h, renamed to default_program_breakpoint_here_p and changed
return type to bool.
* gdbarch.c: Regenerate.
* gdbarch.h: Regenerate.
* gdbarch.sh (program_breakpoint_here_p): New method.
* infrun.c (handle_signal_stop): Call
gdbarch_program_breakpoint_here_p.
I noticed a couple of minor issues in ctfread.c, both fixed by this
patch:
* ctf_fp_info was not indented properly; and
* _initialize_ctfread is no longer needed
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* ctfread.c (struct ctf_fp_info): Reindent.
(_initialize_ctfread): Remove.
Change-Id: I72707b74bc59e6e426b3a7bc8843d96c0d786f1e
This patch removes the "readin" and "compunit_symtab" members from
partial_symtab, replacing them with methods. Then it introduces a new
"standard_psymtab" class, which restores these members; and changes
the symbol readers to use this intermediate class as the base class of
their partial symtab subclasses.
The reason for this is to make it possible for a symbol reader to
implement an alternate mapping between partial and full symbol tables.
This is important in order to be able to share psymtabs across
objfiles -- whether a psymtab has been "readin" is objfile-dependent,
as are the pointers to the full symbol tables.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* psymtab.c (partial_map_expand_apply)
(psym_find_pc_sect_compunit_symtab, psym_lookup_symbol)
(psymtab_to_symtab, psym_find_last_source_symtab, dump_psymtab)
(psym_print_stats, psym_expand_symtabs_for_function)
(psym_map_symbol_filenames, psym_map_matching_symbols)
(psym_expand_symtabs_matching)
(partial_symtab::read_dependencies, maintenance_info_psymtabs)
(maintenance_check_psymtabs): Use new methods.
* psympriv.h (struct partial_symtab) <readin_p,
get_compunit_symtab>: New methods.
<readin, compunit_symtab>: Remove members.
(struct standard_psymtab): New.
(struct legacy_psymtab): Derive from standard_psymtab.
* dwarf2read.h (struct dwarf2_psymtab): Derive from
standard_psymtab.
* ctfread.c (struct ctf_psymtab): Derive from standard_psymtab.
Change-Id: Idb923f196d7e03bf7cb9cfc8134ed06dd3f211ce
Most of the symbol readers have code to iterate over a partial symtabs
dependencies, expanding each one and optionally printing a message.
Now that the "second-stage" psymtab expansion is available as a
method, these implementations can all be merged.
This patch also changes a couple more warnings into assertions.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_psymtab_to_symtab_1): Call
read_dependencies. Add assert.
* psymtab.c (partial_symtab::read_dependencies): New method.
* psympriv.h (struct partial_symtab) <read_dependencies>: New
method.
* mdebugread.c (psymtab_to_symtab_1): Call read_dependencies.
* dwarf2read.c (dwarf2_psymtab::expand_psymtab): Call
read_dependencies.
* dbxread.c (dbx_psymtab_to_symtab_1): Call read_dependencies.
Add assert.
Change-Id: I8151e05677794e90223edc1a4cb70f7f69137d46
The symbol readers generally used two functions to expand a partial
symtab: an outer function (now the "read_symtab" method), and an inner
function, typically named something like "psymtab_to_symtab".
This patch changes this second step to be a method on partial_symtab,
and updates all the callers. For legacy_psymtab, a new function
pointer member is introduced.
This patch enables a subsequent cleanup.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_psymtab_to_symtab_1): Change argument order.
Call expand_psymtab.
(xcoff_read_symtab): Call expand_psymtab.
(xcoff_start_psymtab, xcoff_end_psymtab): Set
legacy_expand_psymtab.
* psympriv.h (struct partial_symtab) <expand_psymtab>: New
method.
(struct legacy_psymtab) <expand_psymtab>: Implement.
<legacy_expand_psymtab>: New member.
* mdebugread.c (mdebug_read_symtab): Call expand_psymtab.
(parse_partial_symbols): Set legacy_expand_psymtab.
(psymtab_to_symtab_1): Change argument order. Call
expand_psymtab.
(new_psymtab): Set legacy_expand_psymtab.
* dwarf2read.h (struct dwarf2_psymtab) <expand_psymtab>: Declare.
* dwarf2read.c (dwarf2_psymtab::read_symtab): Call
expand_psymtab.
(dwarf2_psymtab::expand_psymtab): Rename from
psymtab_to_symtab_1. Call expand_psymtab.
* dbxread.c (start_psymtab): Set legacy_expand_psymtab.
(dbx_end_psymtab): Likewise.
(dbx_psymtab_to_symtab_1): Change argument order. Call
expand_psymtab.
(dbx_read_symtab): Call expand_psymtab.
* ctfread.c (struct ctf_psymtab) <expand_psymtab>: Declare.
(ctf_psymtab::expand_psymtab): Rename from psymtab_to_symtab.
(ctf_psymtab::read_symtab): Call expand_psymtab.
Change-Id: Ic39a2d7aa7b424088d910b59dbd21271fa1c3430
Each symbol reader implemented its own "Reading..." messages, and most
of them double-checked that a previously-expanded psymtab could not be
re-read.
This patch consolidates the message-printing, and changes these checks
into asserts.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_read_symtab): Remove prints. Add assert.
* psymtab.c (psymtab_to_symtab): Print verbose "Reading"
messages.
* mdebugread.c (mdebug_read_symtab): Remove prints.
* dwarf2read.c (dwarf2_psymtab::read_symtab): Remove prints. Add
assert.
* dbxread.c (dbx_read_symtab): Remove prints. Add assert.
Change-Id: I795be9710d42708299bb7b44972cffd27aec9413
This introduces a new partial_symtab::read_symtab method, and updates
the symbol readers to subclass partial_symtab and implement this
method. The old read_symtab and read_symtab_private members are
removed.
In practice, only DWARF and CTF are truly updated to take advantage of
the new setup. The other symbol readers are less actively maintained,
and so this patch also introduces a "legacy_psymtab", which
essentially works the same way as the old partial_symtab.
(Note that, without more knowledge of the interaction between these
symbol readers, fixing this to remove the new (small) overhead is not
trivial, because these readers copy the read_symtab pointer between
partial symtabs.)
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (this_symtab_psymtab, read_xcoff_symtab)
(xcoff_psymtab_to_symtab_1, xcoff_read_symtab)
(xcoff_start_psymtab, xcoff_end_psymtab, scan_xcoff_symtab): Use
legacy_symtab.
* stabsread.h (dbx_end_psymtab): Use legacy_symtab.
* psymtab.c (psymtab_to_symtab): Call method.
(dump_psymtab): Update.
* psympriv.h (struct partial_symtab): Add virtual destructor.
<read_symtab>: New method.
(struct legacy_symtab): New.
* mdebugread.c (mdebug_read_symtab): Use legacy_psymtab.
(struct pst_map) <pst>: Now a legacy_psymtab.
(parse_procedure, parse_partial_symbols, psymtab_to_symtab_1)
(new_psymtab): Use legacy_psymtab.
* dwarf2read.h (struct dwarf2_psymtab): New.
(struct dwarf2_per_cu_data) <psymtab>: Use it.
* dwarf2read.c (dwarf2_create_include_psymtab)
(dwarf2_build_include_psymtabs, create_type_unit_group)
(create_partial_symtab, process_psymtab_comp_unit_reader)
(build_type_psymtabs_reader, build_type_psymtab_dependencies)
(set_partial_user): Use dwarf2_psymtab.
(dwarf2_psymtab::read_symtab): Rename from dwarf2_read_symtab.
(psymtab_to_symtab_1, process_full_comp_unit)
(process_full_type_unit, dwarf2_ranges_read)
(dwarf2_get_pc_bounds, psymtab_include_file_name)
(dwarf_decode_lines): Use dwarf2_psymtab.
* dwarf-index-write.c (psym_index_map): Use dwarf2_psymtab.
(add_address_entry_worker, write_one_signatured_type)
(recursively_count_psymbols, recursively_write_psymbols)
(write_one_signatured_type, psyms_seen_size, write_gdbindex)
(write_debug_names): Likewise.
* dbxread.c (struct header_file_location): Take a legacy_psymtab.
<pst>: Now a legacy_psymtab.
(find_corresponding_bincl_psymtab): Return a legacy_psymtab.
(read_dbx_symtab, start_psymtab, dbx_end_psymtab)
(dbx_psymtab_to_symtab_1, read_ofile_symtab): Use legacy_psymtab.
* ctfread.c (struct ctf_psymtab): New.
(ctf_start_symtab, ctf_end_symtab, psymtab_to_symtab): Take a
ctf_psymtab.
(ctf_psymtab::read_symtab): Rename from ctf_read_symtab.
(create_partial_symtab): Return a ctf_psymtab.
(scan_partial_symbols): Update.
Change-Id: Ia57a828786867d6ad03200af8f996f48ed15285e
This turns start_psymtab_common into a constructor, and then changes
the callers to use "new" directly. This completes the psymtab
allocation transition -- now it is possible for symbol readers to
subclass struct partial_symtab.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_start_psymtab): Use new.
* psymtab.c (partial_symtab::partial_symtab): New constructor,
renamed from start_psymtab_common.
* psympriv.h (struct partial_symtab): Add new constructor.
(start_psymtab_common): Don't declare.
* mdebugread.c (parse_partial_symbols): Use new.
* dwarf2read.c (create_partial_symtab): Use new.
* dbxread.c (start_psymtab): Use new.
* ctfread.c (create_partial_symtab): Use new.
Change-Id: I5a0217bcb52bcfa442559771954bb66bd9ccbf02
This is the next step in getting the symbol readers to allocate
psymtabs themselves: change allocate_psymtab to be an ordinary
constructor, and then use "new" at the previous call sites. Note that
this doesn't get us all the way -- start_psymtab_common is still
allocating a partial symtab.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_end_psymtab): Use new.
* psymtab.c (start_psymtab_common): Use new.
(partial_symtab::partial_symtab): Rename from allocate_psymtab.
Update.
* psympriv.h (struct partial_symtab): Add parameters to
constructor. Don't inline.
(allocate_psymtab): Don't declare.
* mdebugread.c (new_psymtab): Use new.
* dwarf2read.c (dwarf2_create_include_psymtab): Use new.
* dbxread.c (dbx_end_psymtab): Use new.
Change-Id: Iffeae64c925050b90b9916cbc36e15b26ff42226
Currently, partial symbol tables are allocated by a method in
psymtab_storage. However, eventually we want to subclass partial
symtabs in the symbol readers, so the calls to "new" will have to
happen there. This patch is a first step, moving the allocation from
psymtab_storage and into allocate_psymtab.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* psymtab.h (class psymtab_storage) <install_psymtab>: Rename from
allocate_psymtab. Update documentation.
* psymtab.c (psymtab_storage::install_psymtab): Rename from
allocate_psymtab. Do not use new.
(allocate_psymtab): Use new. Update.
Change-Id: Iba6a9bf3ee1e78062fdb9f007c3010f826f64bc8
This changes psymtabs to be allocated with new and destroyed with
delete. As a consequence, the psymtab free-list is also removed.
The motivation for this is to let symbol readers subclass
partial_symtab.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* mdebugread.c (parse_partial_symbols): Use discard_psymtab.
* psymtab.h (class psymtab_storage) <free_psymtabs>: Remove.
* psymtab.c (psymtab_storage): Delete psymtabs.
(psymtab_storage::allocate_psymtab): Use new.
(psymtab_storage::discard_psymtab): Use delete.
* psympriv.h (struct partial_symtab): Add constructor and
initializers.
Change-Id: I4e78ac538fc0ea52b57489c1afb8f935a30941ef
machoread.c does not need to include psympriv.h.
gdb/ChangeLog
2020-01-26 Tom Tromey <tom@tromey.com>
* machoread.c: Do not include psympriv.h.
Change-Id: I6362bd2e95e7416cb9bae3d48b69dd6dbe4f2cc8
Mention in NEWS the new option and the set/show commands.
Document in gdb.texinfo the new option and the set/show commands.
gdb/ChangeLog
2020-01-25 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* NEWS: Mention the new option and the set/show commands.
gdb/doc/ChangeLog
2020-01-25 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* gdb.texinfo (Attach): Document the new option and the
set/show commands.
(Connecting): Reference the exec-file-mismatch option.
This option allows to tell GDB to detect and possibly handle mismatched exec-files.
A recurrent problem with GDB is that GDB uses the wrong exec-file
when using the attach/detach commands successively.
Also, in case the user specifies a file on the command line but attaches
to the wrong PID, this error is not made visible and gives a not user
understandable behaviour.
For example:
$ gdb
...
(gdb) atta 2682 ############################################ PID running 'sleepers' executable
Attaching to process 2682
[New LWP 2683]
[New LWP 2684]
[New LWP 2685]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f5ff829f603 in select () at ../sysdeps/unix/syscall-template.S:84
84 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) det
Detaching from program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 2682
[Inferior 1 (process 2682) detached]
(gdb) atta 31069 ############################################ PID running 'gdb' executable
Attaching to program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 31069
Reading symbols from /lib64/ld-linux-x86-64.so.2...
Reading symbols from /usr/lib/debug/.build-id/60/6df9c355103e82140d513bc7a25a635591c153.debug...
0x00007f43c23478a0 in ?? ()
(gdb) bt
#0 0x00007f43c23478a0 in ?? ()
#1 0x0000558909e3ad91 in ?? ()
#2 0x0000202962646700 in ?? ()
#3 0x00007ffc69c74e70 in ?? ()
#4 0x000055890c1d2350 in ?? ()
#5 0x0000000000000000 in ?? ()
(gdb)
The second attach has kept the executable of the first attach.
(in this case, 31069 is the PID of a GDB, that has nothing to do
with the first determined 'sleepers' executable).
Similarly, if specifying an executable, but attaching to a wrong pid,
we get:
gdb /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers
...
Reading symbols from /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers...
(gdb) atta 31069 ############################################ PID running 'gdb' executable
Attaching to program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 31069
Reading symbols from /lib64/ld-linux-x86-64.so.2...
Reading symbols from /usr/lib/debug/.build-id/60/6df9c355103e82140d513bc7a25a635591c153.debug...
0x00007f43c23478a0 in ?? ()
(gdb) bt
#0 0x00007f43c23478a0 in ?? ()
#1 0x0000558909e3ad91 in ?? ()
#2 0x0000202962646700 in ?? ()
#3 0x00007ffc69c74e70 in ?? ()
#4 0x000055890c1d2350 in ?? ()
#5 0x0000000000000000 in ?? ()
(gdb)
And it is unclear to the user what has happened/what is going wrong.
This patch series implements a new option:
(gdb) apropos exec-file-mismatch
set exec-file-mismatch -- Set exec-file-mismatch handling (ask|warn|off).
show exec-file-mismatch -- Show exec-file-mismatch handling (ask|warn|off).
(gdb) help set exec-file-mismatch
Set exec-file-mismatch handling (ask|warn|off).
Specifies how to handle a mismatch between the current exec-file name
loaded by GDB and the exec-file name automatically determined when attaching
to a process:
ask - warn the user and ask whether to load the determined exec-file.
warn - warn the user, but do not change the exec-file.
off - do not check for mismatch.
"ask" means: in case of mismatch between the current exec-file name
and the automatically determined exec-file name of the PID we are attaching to,
give a warning to the user and ask whether to load the automatically determined
exec-file.
"warn" means: in case of mismatch, just give a warning to the user.
"off" means: do not check for mismatch.
This fixes PR gdb/17626.
There was a previous trial to fix this PR.
See https://sourceware.org/ml/gdb-patches/2015-07/msg00118.html
This trial was however only fixing the problem for the automatically
determined executable files when doing attach.
It was differentiating the 'user specified executable files' ("sticky")
from the executable files automatically found by GDB.
But such user specified sticky executables are in most cases due
to a wrong manipulation by the user, giving unexpected results
such as backtrace showing no function like in the above example.
This patch ensures that whenever a process executable can be
determined, that the user is warned if there is a mismatch.
The same tests as above then give:
(gdb) atta 2682
Attaching to process 2682
[New LWP 2683]
[New LWP 2684]
[New LWP 2685]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f5ff829f603 in select () at ../sysdeps/unix/syscall-template.S:84
84 ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) det
Detaching from program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 2682
[Inferior 1 (process 2682) detached]
(gdb) atta 31069
Attaching to program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 31069
warning: Mismatch between current exec-file /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers
and automatically determined exec-file /bd/home/philippe/gdb/git/build_fixes/gdb/gdb
exec-file-mismatch handling is currently "ask"
Load new symbol table from "/bd/home/philippe/gdb/git/build_fixes/gdb/gdb"? (y or n) y
Reading symbols from /bd/home/philippe/gdb/git/build_fixes/gdb/gdb...
Setting up the environment for debugging gdb.
...
Reading symbols from /usr/lib/debug/.build-id/60/6df9c355103e82140d513bc7a25a635591c153.debug...
0x00007f43c23478a0 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
84 ../sysdeps/unix/syscall-template.S: No such file or directory.
(top-gdb) bt
During symbol reading: incomplete CFI data; unspecified registers (e.g., rax) at 0x7f43c23478ad
During symbol reading: unsupported tag: 'DW_TAG_unspecified_type'
During symbol reading: cannot get low and high bounds for subprogram DIE at 0x12282a7
During symbol reading: Child DIE 0x12288ba and its abstract origin 0x1228b26 have different parents
During symbol reading: DW_AT_call_target target DIE has invalid low pc, for referencing DIE 0x1229540 [in module /bd/home/philippe/gdb/git/build_fixes/gdb/gdb]
#0 0x00007f43c23478a0 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
#1 0x0000558909e3ad91 in poll (__timeout=-1, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2 gdb_wait_for_event (block=block@entry=1) at ../../fixes/gdb/event-loop.c:772
#3 0x0000558909e3aef4 in gdb_do_one_event () at ../../fixes/gdb/event-loop.c:347
#4 0x0000558909e3b085 in gdb_do_one_event () at ../../fixes/gdb/common/common-exceptions.h:219
#5 start_event_loop () at ../../fixes/gdb/event-loop.c:371
During symbol reading: Member function "~_Sp_counted_base" (offset 0x1c69bf7) is virtual but the vtable offset is not specified
During symbol reading: Multiple children of DIE 0x1c8f5a0 refer to DIE 0x1c8f0ee as their abstract origin
#6 0x0000558909ed3b78 in captured_command_loop () at ../../fixes/gdb/main.c:331
#7 0x0000558909ed4b6d in captured_main (data=<optimized out>) at ../../fixes/gdb/main.c:1174
#8 gdb_main (args=<optimized out>) at ../../fixes/gdb/main.c:1190
#9 0x0000558909c1e9a8 in main (argc=<optimized out>, argv=<optimized out>) at ../../fixes/gdb/gdb.c:32
(top-gdb)
gdb /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers
...
Reading symbols from /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers...
(gdb) atta 31069
Attaching to program: /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers, process 31069
warning: Mismatch between current exec-file /home/philippe/valgrind/git/trunk_untouched/gdbserver_tests/sleepers
and automatically determined exec-file /bd/home/philippe/gdb/git/build_fixes/gdb/gdb
exec-file-mismatch handling is currently "ask"
Load new symbol table from "/bd/home/philippe/gdb/git/build_fixes/gdb/gdb"? (y or n) y
Reading symbols from /bd/home/philippe/gdb/git/build_fixes/gdb/gdb...
Setting up the environment for debugging gdb.
....
In other words, it now works as intuitively expected by the user.
If ever the user gave the correct executable on the command line,
then attached to the wrong pid, then confirmed loading the wrong executable,
the user can simply fix this by detaching, and attaching to the correct pid,
GDB will then tell again to the user that the exec-file might better
be loaded.
The default value of "ask" is chosen instead of e.g. "warn" as in most
cases, switching of executable will be the correct action,
and in any case, the user can decide to not load the executable,
as GDB asks a confirmation to the user to load the new executable.
For settings "ask" and "warn", the new function validate_exec_file ()
tries to get the inferior pid exec file and compares it with the current
exec file. In case of mismatch, it warns the user and optionally load
the executable.
This function is called in the attach_command implementation to cover
most cases of attaching to a running process.
It must also be called in remote.c, as the attach command is not supported
for all types of remote gdbserver.
gdb/ChangeLog
2020-01-25 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* exec.c (exec_file_mismatch_names, exec_file_mismatch_mode)
(show_exec_file_mismatch_command, set_exec_file_mismatch_command)
(validate_exec_file): New variables, enums, functions.
(exec_file_locate_attach, print_section_info): Style the filenames.
(_initialize_exec): Install show_exec_file_mismatch_command and
set_exec_file_mismatch_command.
* gdbcore.h (validate_exec_file): Declare.
* infcmd.c (attach_command): Call validate_exec_file.
* remote.c ( remote_target::remote_add_inferior): Likewise.
This commit improves GDB's handling of inline functions when there are
more than one inline function in a stack, so for example if we have a
stack like:
main -> aaa -> bbb -> ccc -> ddd
And aaa, bbb, and ccc are all inline within main GDB should (when
given sufficient debug information) be able to step from main through
aaa, bbb, and ccc. Unfortunately, this currently doesn't work, here's
an example session:
(gdb) start
Temporary breakpoint 1 at 0x4003b0: file test.c, line 38.
Starting program: /project/gdb/tests/inline/test
Temporary breakpoint 1, main () at test.c:38
38 global_var = 0;
(gdb) step
39 return aaa () + 1;
(gdb) step
aaa () at test.c:39
39 return aaa () + 1;
(gdb) step
bbb () at test.c:39
39 return aaa () + 1;
(gdb) step
ccc () at test.c:39
39 return aaa () + 1;
(gdb) step
ddd () at test.c:32
32 return global_var;
(gdb) bt
#0 ddd () at test.c:32
#1 0x00000000004003c1 in ccc () at test.c:39
#2 bbb () at test.c:26
#3 aaa () at test.c:14
#4 main () at test.c:39
Notice that once we get to line 39 in main, GDB keeps reporting line
39 in main as the location despite understanding that the inferior is
stepping through the nested inline functions with each use of step.
The problem is that as soon as the inferior stops we call
skip_inline_frames (from inline-frame.c) which calculates the
inferiors current state in relation to inline functions - it figures
out if we're in an inline function, and if we are counts how many
inline frames there are at the current location.
So, in our example above, when we step from line 38 in main to line 39
we stop at a location that is simultaneously in all of main, aaa, bbb,
and ccc. The block structure reflects the order in which the
functions would be called, with ccc being the most inner block and
main being the most outer block. When we stop GDB naturally finds the
block for ccc, however within skip_inline_frames we spot that bbb,
aaa, and main are super-blocks of the current location and that each
layer represents an inline function. The skip_inline_frames then
records the depth of inline functions (3 in this case for aaa, bbb,
and ccc) and also the symbol of the outermost inline function (in this
case 'aaa' as main isn't an inline function, it just has things inline
within it).
Now GDB understands the stack to be main -> aaa -> bbb -> ccc,
however, the state initialised in skip_inline_frames starts off
indicating that we should hide 3 frames from the user, so we report
that we're in main at line 39. The location of main, line 39 is
derived by asking the inline function state for the last symbol in the
stack (aaa in this case), and then asking for it's location - the
location of an inlined function symbol is its call site, so main, line
39 in this case.
If the user then asks GDB to step we don't actually move the inferior
at all, instead we spot that we are in an inline function stack,
lookup the inline state data, and reduce the skip depth by 1. We then
report to the user that GDB has stopped. GDB now understands that we
are in 'aaa'. In order to get the precise location we again ask GDB
for the last symbol from the inline data structure, and we are again
told 'aaa', we then get the location from 'aaa', and report that we
are in main, line 39.
Hopefully it's clear what the mistake here is, once we've reduced the
inline skip depth we should not be using 'aaa' to compute the precise
location, instead we should be using 'bbb'. That is what this patch
does.
Now, when we call skip_inline_frames instead of just recording the
last skipped symbol we now record all symbols in the inline frame
stack. When we ask GDB for the last skipped symbol we return a symbol
based on how many frames we are skipping, not just the last know
symbol.
With this fix in place, the same session as above now looks much
better:
(gdb) start
Temporary breakpoint 1 at 0x4003b0: file test.c, line 38.
Starting program: /project/gdb/tests/inline/test
Temporary breakpoint 1, main () at test.c:38
38 global_var = 0;
(gdb) s
39 return aaa () + 1;
(gdb) s
aaa () at test.c:14
14 return bbb () + 1;
(gdb) s
bbb () at test.c:26
26 return ccc () + 1;
(gdb) s
ccc () at test.c:20
20 return ddd () + 1;
(gdb) s
ddd () at test.c:32
32 return global_var;
(gdb) bt
#0 ddd () at test.c:32
#1 0x00000000004003c1 in ccc () at test.c:20
#2 bbb () at test.c:26
#3 aaa () at test.c:14
#4 main () at test.c:39
gdb/ChangeLog:
* frame.c (find_frame_sal): Move call to get_next_frame into more
inner scope.
* inline-frame.c (inilne_state) <inline_state>: Update argument
types.
(inilne_state) <skipped_symbol>: Rename to...
(inilne_state) <skipped_symbols>: ...this, and change to a vector.
(skip_inline_frames): Build vector of skipped symbols and use this
to reate the inline_state.
(inline_skipped_symbol): Add a comment and some assertions, fetch
skipped symbol from the list.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/dw2-inline-many-frames.c: New file.
* gdb.dwarf2/dw2-inline-many-frames.exp: New file.
Change-Id: I99def5ffb44eb9e58cda4b449bf3d91ab0386c62
Don't reorder line table entries for the same address when sorting the
line table, maintain the compiler given line order. Usually this will
reflect the order in which lines are conceptually encountered at a
given address.
Consider this example:
/* 1 */ volatile int global_var;
/* 2 */ int __attribute__ ((noinline))
/* 3 */ bar ()
/* 4 */ {
/* 5 */ return global_var;
/* 6 */ }
/* 7 */ static inline int __attribute__ ((always_inline))
/* 8 */ foo ()
/* 9 */ {
/* 10 */ return bar ();
/* 11 */ }
/* 12 */ int
/* 13 */ main ()
/* 14 */ {
/* 15 */ global_var = 0;
/* 16 */ return foo ();
/* 17 */ }
GCC 10 currently generates a line table like this (as shown by
objdump):
CU: ./test.c:
File name Line number Starting address
test.c 4 0x4004b0
test.c 5 0x4004b0
test.c 6 0x4004b6
test.c 6 0x4004b7
test.c 14 0x4003b0
test.c 15 0x4003b0
test.c 16 0x4003ba
test.c 10 0x4003ba
test.c 10 0x4003c1
The interesting entries are those for lines 16 and 10 at address
0x4003ba, these represent the call to foo and the inlined body of
foo.
With the current line table sorting GDB builds the line table like
this (as shown by 'maintenance info line-table'):
INDEX LINE ADDRESS
0 14 0x00000000004003b0
1 15 0x00000000004003b0
2 10 0x00000000004003ba
3 16 0x00000000004003ba
4 END 0x00000000004003c1
5 4 0x00000000004004b0
6 5 0x00000000004004b0
7 END 0x00000000004004b7
Notice that entries 2 and 3 for lines 10 and 16 are now in a different
order to the line table as given by the compiler. With this patch
applied the order is now:
INDEX LINE ADDRESS
0 14 0x00000000004003b0
1 15 0x00000000004003b0
2 16 0x00000000004003ba
3 10 0x00000000004003ba
4 END 0x00000000004003c1
5 4 0x00000000004004b0
6 5 0x00000000004004b0
7 END 0x00000000004004b7
Notice that entries 2 and 3 are now in their original order again.
The consequence of the incorrect ordering is that when stepping
through inlined functions GDB will display the wrong line for the
inner most frame. Here's a GDB session before this patch is applied:
Starting program: /home/andrew/tmp/inline/test
Temporary breakpoint 1, main () at test.c:15
15 /* 15 */ global_var = 0;
(gdb) step
16 /* 16 */ return foo ();
(gdb) step
foo () at test.c:16
16 /* 16 */ return foo ();
(gdb) step
bar () at test.c:5
5 /* 5 */ return global_var;
The step from line 15 to 16 was fine, but the next step should have
taken us to line 10, instead we are left at line 16. The final step
to line 5 is as expected.
With this patch applied the session goes better:
Starting program: /home/andrew/tmp/inline/test
Temporary breakpoint 1, main () at test.c:15
15 /* 15 */ global_var = 0;
(gdb) step
16 /* 16 */ return foo ();
(gdb) step
foo () at test.c:10
10 /* 10 */ return bar ();
(gdb) step
bar () at test.c:5
5 /* 5 */ return global_var;
We now visit the lines as 15, 16, 10, 5 as we would like.
The reason for this issue is that the inline frame unwinder is
detecting that foo is inlined in main. When we stop at the shared
address 0x4003ba the inline frame unwinder first shows us the outer
frame, this information is extracted from the DWARF's
DW_TAG_inlined_subroutine entries and passed via GDB's block data.
When we step again the inlined frame unwinder moves us up the call
stack to the inner most frame at which point the frame is displayed as
normal, with the location for the address being looked up in the line
table.
As GDB uses the last line table entry for an address as "the" line to
report for that address it is critical that GDB maintain the order of
the line table entries. In the first case, by reordering the line
table we report the wrong location.
I had to make a small adjustment in find_pc_sect_line in order to
correctly find the previous line in the line table. In some line
tables I was seeing an actual line entry and an end of sequence marker
at the same address, before this commit these would reorder to move
the end of sequence marker before the line entry (end of sequence has
line number 0). Now the end of sequence marker remains in its correct
location, and in order to find a previous line we should step backward
over any end of sequence markers.
As an example, the binary:
gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges-func/dw2-ranges-func-lo-cold
Has this line table before the patch:
INDEX LINE ADDRESS
0 48 0x0000000000400487
1 END 0x000000000040048e
2 52 0x000000000040048e
3 54 0x0000000000400492
4 56 0x0000000000400497
5 END 0x000000000040049a
6 62 0x000000000040049a
7 END 0x00000000004004a1
8 66 0x00000000004004a1
9 68 0x00000000004004a5
10 70 0x00000000004004aa
11 72 0x00000000004004b9
12 END 0x00000000004004bc
13 76 0x00000000004004bc
14 78 0x00000000004004c0
15 80 0x00000000004004c5
16 END 0x00000000004004cc
And after this patch:
INDEX LINE ADDRESS
0 48 0x0000000000400487
1 52 0x000000000040048e
2 END 0x000000000040048e
3 54 0x0000000000400492
4 56 0x0000000000400497
5 END 0x000000000040049a
6 62 0x000000000040049a
7 66 0x00000000004004a1
8 END 0x00000000004004a1
9 68 0x00000000004004a5
10 70 0x00000000004004aa
11 72 0x00000000004004b9
12 END 0x00000000004004bc
13 76 0x00000000004004bc
14 78 0x00000000004004c0
15 80 0x00000000004004c5
16 END 0x00000000004004cc
When calling find_pc_sect_line with the address 0x000000000040048e, in
both cases we find entry #3, we then try to find the previous entry,
which originally found this entry '2 52 0x000000000040048e',
after the patch it finds '2 END 0x000000000040048e', which
cases the lookup to fail.
By skipping the END marker after this patch we get back to the correct
entry, which is now #1: '1 52 0x000000000040048e', and
everything works again.
gdb/ChangeLog:
* buildsym.c (lte_is_less_than): Delete.
(buildsym_compunit::end_symtab_with_blockvector): Create local
lambda function to sort line table entries, and use
std::stable_sort instead of std::sort.
* symtab.c (find_pc_sect_line): Skip backward over end of sequence
markers when looking for a previous line.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/dw2-inline-stepping.c: New file.
* gdb.dwarf2/dw2-inline-stepping.exp: New file.
Change-Id: Ia0309494be4cfd9dcc554f30209477f5f040b21b
In this commit:
commit d9b3de22f3
Date: Wed May 27 14:44:29 2015 -0700
Add struct to record dwarf line number state machine.
I believe an unintended change was made to how we store the DWARF line
table, the end of sequence markers between sequences of lines were
lost from the line table.
This commit fixes this small oversight and restores the end of
sequence markers.
Given that we've survived this long without noticing is clearly an
indication that this isn't that serious, however, a later patch that I
am developing would benefit from having the markers in place, so I'd
like to restore them.
Having the markers also means that the output of 'maintenance info
line-table' now more closely reflects the DWARF line table.
I've taken this opportunity to improve how 'maintenance info
line-table' displays the end of sequence markers - it now uses the END
keyword, rather than just printing an entry with line number 0. So we
see this:
INDEX LINE ADDRESS
0 12 0x00000000004003b0
1 17 0x00000000004003b0
2 18 0x00000000004003b0
3 END 0x00000000004003b7
4 5 0x00000000004004a0
5 6 0x00000000004004a0
6 END 0x00000000004004a7
Instead of what we would have seen, which was this:
INDEX LINE ADDRESS
0 12 0x00000000004003b0
1 17 0x00000000004003b0
2 18 0x00000000004003b0
3 0 0x00000000004003b7
4 5 0x00000000004004a0
5 6 0x00000000004004a0
6 0 0x00000000004004a7
I've added a small test that uses 'maintenance info line-table' to
ensure that we don't regress this again.
gdb/ChangeLog:
* dwarf2read.c (lnp_state_machine::record_line): Include
end_sequence parameter in debug print out. Record the line if we
are at an end_sequence marker even if it's not the start of a
statement.
* symmisc.c (maintenance_print_one_line_table): Print end of
sequence markers with 'END' not '0'.
gdb/testsuite/ChangeLog:
* gdb.base/maint.exp: Update line table parsing test.
* gdb.dwarf2/dw2-ranges-base.exp: Add new line table parsing test.
Change-Id: I002f872248db82a1d4fefdc6b51ff5dbf932d8a8
This fixes a latent bug exposed by the multi-target patch (5b6d1e4fa
"Multi-target support), and then fixes two other latent bugs exposed
by fixing that first latent bug.
The symptom described in the bug report is that starting a first
inferior, then trying to run a second (multi-threaded) inferior twice,
causes libthread_db to fail to load, along with other erratic
behavior:
(gdb) run
Starting program: /tmp/foo
warning: td_ta_new failed: generic error
Going a bit deeply, I found that if the two inferiors have different
symbols, we can see that just after inferior 2 exits, we are left with
inferior 2 selected, which is correct, but the symbols in scope belong
to inferior 1, which is obviously incorrect...
This problem is that there's a path in
scoped_restore_current_thread::restore() that switches to no thread
selected, and switches the current inferior, but leaves the current
program space as is, resulting in leaving the program space pointing
to the wrong program space (the one of the other inferior). This was
happening after handling TARGET_WAITKIND_NO_RESUMED, which is an event
that triggers after TARGET_WAITKIND_EXITED for the previous inferior
exit. Subsequent symbol lookups find the symbols of the wrong
inferior.
The fix is to use switch_to_inferior_no_thread in that problem spot.
This function was recently added along with the multi-target work
exactly for these situations.
As for testing, this patch adds a new testcase that tests symbol
printing just after inferior exit, which exercises the root cause of
the problem more directly. And then, to cover the use case described
in the bug too, it also exercises the lithread_db.so mis-loading, by
using TLS printing as a proxy for being sure that threaded debugging
was activated sucessfully. The testcase fails without the fix like
this, for the "print symbol just after exit" bits:
...
[Inferior 1 (process 8719) exited normally]
(gdb) PASS: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: continue until exit
print re_run_var_1
No symbol "re_run_var_1" in current context.
(gdb) FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=1: print re_run_var_1
...
And like this for the "libthread_db.so loading" bits:
(gdb) run
Starting program: /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.multi/multi-re-run/multi-re-run
warning: td_ta_new failed: generic error
[New LWP 27001]
Thread 1.1 "multi-re-run" hit Breakpoint 3, all_started () at /home/pedro/gdb/binutils-gdb/build/../src/gdb/testsuite/gdb.multi/multi-re-run.c:44
44 }
(gdb) PASS: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=2: running to all_started in runto
print tls_var
Cannot find thread-local storage for LWP 27000, executable file /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.multi/multi-re-run/multi-re-run:
Cannot find thread-local variables on this target
(gdb) FAIL: gdb.multi/multi-re-run.exp: re_run_inf=1: iter=2: print tls_var
As mentioned, that fix above goes on to expose a couple other latent
bugs. This commit fixes those as well.
The first latent bug exposed is in
infrun.c:handle_vfork_child_exec_or_exit. The current code is leaving
inf->pspace == NULL while calling clone_program_space. The idea was
to make it so that the breakpoints module doesn't use this inferior's
pspace to set breakpoints. With that, any
scoped_restore_current_thread use from within clone_program_space
tries to restore a NULL program space, which hits an assertion:
Attaching after Thread 0x7ffff74b8700 (LWP 27276) vfork to child process 27277]
[New inferior 2 (process 27277)]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
/home/pedro/gdb/binutils-gdb/build/../src/gdb/progspace.c:243: internal-error: void set_current_program_space(program_space*): Assertion `pspace != NULL' faile
d.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.threads/vfork-follow-child-exit.exp: detach-on-fork=off: continue (GDB internal error)
That NULL pspace idea was legitimate, but it's no longer necessary,
since commit b2e586e850 ("Defer breakpoint reset when cloning
progspace for fork child"). So the fix is to just set the inferior's
program space earlier.
The other latent bug exposed is in exec.c. When exec_close is called
from the program_space destructor, it is purposedly called with a
current program space that is not the current inferior's program
space. The problem is that the multi-target work added some code to
remove_target_sections that loops over all inferiors, and uses
scoped_restore_current_thread to save/restore the previous
thread/inferior/frame state. This makes it so that exec_close returns
with the current program space set to the current inferior's program
space, which is exactly what we did not want. Then the program_space
destructor continues into free_all_objfiles, but it is now running
that method on the wrong program space, resulting in:
Reading symbols from /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.threads/fork-plus-threads/fork-plus-threads...
Reading symbols from /usr/lib/debug/usr/lib64/libpthread-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/libm-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/libc-2.26.so.debug...
Reading symbols from /usr/lib/debug/usr/lib64/ld-2.26.so.debug...
[Inferior 3 (process 9583) exited normally]
/home/pedro/gdb/binutils-gdb/build/../src/gdb/progspace.c:170: internal-error: void program_space::free_all_objfiles(): Assertion `so->objfile == NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: inferior 1 exited (GDB internal error)
The fix is to use scoped_restore_current_pspace_and_thread instead of
scoped_restore_current_thread.
gdb/ChangeLog:
2020-01-24 Pedro Alves <palves@redhat.com>
PR gdb/25410
* thread.c (scoped_restore_current_thread::restore): Use
switch_to_inferior_no_thread.
* exec.c: Include "progspace-and-thread.h".
(add_target_sections, remove_target_sections):
scoped_restore_current_pspace_and_thread instead of
scoped_restore_current_thread.
* infrun.c (handle_vfork_child_exec_or_exit): Assign the pspace
and aspace to the inferior before calling clone_program_space.
Remove stale comment.
gdb/testsuite/ChangeLog:
2020-01-24 Pedro Alves <palves@redhat.com>
PR gdb/25410
* gdb.multi/multi-re-run-1.c: New.
* gdb.multi/multi-re-run-2.c: New.
* gdb.multi/multi-re-run.exp: New.
Fixes a compile error because the class is actually called
arm_netbsd_nat_target.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* arm-nbsd-nat.c (arm_nbsd_nat_target::fetch_registers): Rename to...
(arm_netbsd_nat_target::fetch_registers): ...this.
(arm_nbsd_nat_target::store_registers): Rename to...
(arm_netbsd_nat_target::store_registers): ...this.
Change-Id: Ibebfab9edeff48f54c32d0745afda1d74d31de92
Fixes the below compile error on ARM NetBSD 9.0_RC1 (the only version I
tested). types.h does not define register_t by default.
We already use this define elsewhere, notably in bsd-kvm.c.
In file included from ../../gdb/arm-nbsd-nat.c:28:
/usr/include/machine/frame.h:54:2: error: unknown type name 'register_t'; did you mean '__register_t'?
register_t tf_spsr;
^
/usr/include/machine/types.h:77:14: note: '__register_t' declared here
typedef int __register_t;
^
There are other compile errors that this does not fix.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* arm-nbsd-nat.c: Define _KERNTYPES to get the declaration of
register_t.
Change-Id: I82c21d38189ee59ea0af2538ba84b771d268722e
regset_from_core_section doesn't exist anymore; it has been replaced
by the iterate_over_regset_sections gdbarch method. Update comments
accordingly to not confuse readers.
gdb/ChangeLog:
2020-01-24 Christian Biesinger <cbiesinger@google.com>
* aarch64-fbsd-tdep.c (aarch64_fbsd_iterate_over_regset_sections):
Update comment.
* aarch64-linux-tdep.c (aarch64_linux_iterate_over_regset_sections):
Likewise.
* arm-fbsd-tdep.c (arm_fbsd_iterate_over_regset_sections): Likewise.
* gdbcore.h (deprecated_add_core_fns): Update comment to point to
the correct replacement (iterate_over_regset_sections).
* riscv-fbsd-tdep.c (riscv_fbsd_iterate_over_regset_sections):
Update comment.
Change-Id: I5eea4d18e15edae5d6dfd5d0d6241e5b2ae40daa
This is an update of this patch:
https://sourceware.org/ml/gdb-patches/2018-09/msg00884.html
This patch attempts to address PR gdb/23718 by re-enabling stdin
whenever an exception is caught during gdb.execute().
When Python gdb.execute() is called, an exception could occur (e.g. the
target disappearing), which is then converted into a Python exception. If
stdin was disabled before the exception is caught, it is not re-enabled,
because the exception doesn't propagate to the top level of the event loop,
whose catch block would otherwise enable it.
The result is that when execution of a Python script completes, GDB does
not prompt or accept input, and is effectively hung.
This change rectifies the issue by re-enabling stdin in the catch block of
execute_gdb_command, prior to converting the exception to a Python
exception.
Since this patch was originally posted I've added a test, and also I
converted the code to re-enable stdin from this:
SWITCH_THRU_ALL_UIS ()
{
async_enable_stdin ();
}
to simply this:
async_enable_stdin ();
My reasoning is that we only need the SWITCH_THRU_ALL_UIS if, at the time
the exception is caught, the current_ui might be different than at the time
we called async_disable_stdin. Within python's execute_gdb_command I think
it should be impossible to switch current_ui, so the SWITCH_THRU_ALL_UIS
isn't needed.
gdb/ChangeLog:
PR gdb/23718
* gdb/python/python.c (execute_gdb_command): Call
async_enable_stdin in catch block.
gdb/testsuite/ChangeLog:
PR gdb/23718
* gdb.server/server-kill-python.exp: New file.
Change-Id: I1cfc36ee9f8484cc1ed82be9be338353db6bc080
If we catch an exception in start_event_loop's call to
gdb_do_one_event, then it is possible that the current_ui has changed
since we called async_disable_stdin. If that's the case then calling
async_enable_stdin will be called on the wrong UI.
To solve this problem we wrap the call to async_enable_stdin with
SWITCH_THRU_ALL_UIS, this causes us to try and re-enable stdin for all
UIs, which will catch any for which we called async_disable_stdin.
gdb/ChangeLog:
* event-loop.c (start_event_loop): Wrap async_enable_stdin with
SWITCH_THRU_ALL_UIS.
gdb/testsuite/ChangeLog:
* gdb.server/multi-ui-errors.c: New file.
* gdb.server/multi-ui-errors.exp: New file.
Change-Id: I1e18deff2e6f4e17f7a13adce3553eb001cad93b
This started as a patch to enable the asm window to handle attempts to
disassemble invalid memory, but it ended up expanding into a
significant rewrite of how the asm window handles scrolling. These
two things ended up being tied together as it was impossible to
correctly test scrolling into invalid memory when the asm window would
randomly behave weirdly while scrolling.
Things that should work nicely now; scrolling to the bottom or top of
the listing with PageUp, PageDown, Up Arrow, Down Arrow and we should
be able to scroll past small areas of memory that don't have symbols
associated with them. It should also be possible to scroll to the
start of a section even if there's no symbol at the start of the
section.
Adding tests for this scrolling was a little bit of a problem. First
I would have liked to add tests for PageUp / PageDown, but the tuiterm
library we use doesn't support these commands right now due to only
emulating a basic ascii terminal. Changing this to emulate a more
complex terminal would require adding support for more escape sequence
control codes, so I've not tried to tackle that in this patch.
Next, I would have liked to test scrolling to the start or end of the
assembler listing and then trying to scroll even more, however, this
is a problem because in a well behaving GDB a scroll at the start/end
has no effect. What we need to do is:
- Move to start of assembler listing,
- Send scroll up command,
- Wait for all curses output,
- Ensure the assembler listing is unchanged, we're still at the
start of the listing.
The problem is that there is no curses output, so how long do we wait
at step 3? The same problem exists for scrolling to the bottom of the
assembler listing. However, when scrolling down you can at least see
the end coming, so I added a test for this case, however, this feels
like an area of code that is massively under tested.
gdb/ChangeLog:
PR tui/9765
* minsyms.c (lookup_minimal_symbol_by_pc_section): Update header
comment, add extra parameter, and update to store previous symbol
when appropriate.
* minsyms.h (lookup_minimal_symbol_by_pc_section): Update comment,
add extra parameter.
* tui/tui-disasm.c (tui_disassemble): Update header comment,
remove unneeded parameter, add try/catch around gdb_print_insn,
rewrite to add items to asm_lines vector.
(tui_find_backward_disassembly_start_address): New function.
(tui_find_disassembly_address): Updated throughout.
(tui_disasm_window::set_contents): Update for changes to
tui_disassemble.
(tui_disasm_window::do_scroll_vertical): No need to adjust the
number of lines to scroll.
gdb/testsuite/ChangeLog:
PR tui/9765
* gdb.tui/tui-layout-asm.exp: Add scrolling test for asm window.
Change-Id: I323987c8fd316962c937e73c17d952ccd3cfa66c
The pattern
objfile->section_offsets[SECT_OFF_TEXT (objfile)]
... appears very often, to get the offset of the text section of an
objfile. I thought it would be more readable to write it as:
objfile->text_section_offset ()
... so I added this method and used it where possible. I also added
data_section_offset, although it is not used as much.
gdb/ChangeLog:
* objfiles.h (ALL_OBJFILE_OSECTIONS): Move up.
(SECT_OFF_DATA): Likewise.
(SECT_OFF_RODATA): Likewise.
(SECT_OFF_TEXT): Likewise.
(SECT_OFF_BSS): Likewise.
(struct objfile) <text_section_offset, data_section_offset>: New
methods.
* amd64-windows-tdep.c (amd64_windows_find_unwind_info): Use
objfile::text_section_offset.
* coff-pe-read.c (add_pe_forwarded_sym): Likewise.
* coffread.c (coff_symtab_read): Likewise.
(enter_linenos): Likewise.
(process_coff_symbol): Likewise.
* ctfread.c (get_objfile_text_range): Likewise.
* dtrace-probe.c (dtrace_probe::get_relocated_address):
Use objfile::data_section_offset.
* dwarf2-frame.c (execute_cfa_program): Use
objfile::text_section_offset.
(dwarf2_frame_find_fde): Likewise.
* dwarf2read.c (create_addrmap_from_index): Likewise.
(create_addrmap_from_aranges): Likewise.
(dw2_find_pc_sect_compunit_symtab): Likewise.
(process_psymtab_comp_unit_reader): Likewise.
(add_partial_symbol): Likewise.
(add_partial_subprogram): Likewise.
(process_full_comp_unit): Likewise.
(read_file_scope): Likewise.
(read_func_scope): Likewise.
(read_lexical_block_scope): Likewise.
(read_call_site_scope): Likewise.
(dwarf2_rnglists_process): Likewise.
(dwarf2_ranges_process): Likewise.
(dwarf2_ranges_read): Likewise.
(dwarf_decode_lines_1): Likewise.
(new_symbol): Likewise.
(dwarf2_fetch_die_loc_sect_off): Likewise.
(dwarf2_per_cu_text_offset): Likewise.
* hppa-bsd-tdep.c (hppabsd_find_global_pointer): Likewise.
* hppa-tdep.c (read_unwind_info): Likewise.
* ia64-tdep.c (ia64_find_unwind_table): Likewise.
* psympriv.h (struct partial_symtab): Likewise.
* psymtab.c (find_pc_sect_psymtab): Likewise.
* solib-svr4.c (enable_break): Likewise.
* stap-probe.c (relocate_address): Use
objfile::data_section_offset.
* xcoffread.c (enter_line_range): Use
objfile::text_section_offset.
(read_xcoff_symtab): Likewise.
We encounter this error when building on macOS with GCC.
CXX darwin-nat.o
/src-local/binutils-gdb/gdb/darwin-nat.c: In member function 'ptid_t darwin_nat_target::wait_1(ptid_t, target_waitstatus*)':
/src-local/binutils-gdb/gdb/darwin-nat.c:1264:18: error: declaration of 'inf' shadows a previous local [-Werror=shadow=compatible-local]
for (inferior *inf : all_inferiors (this))
^~~
/src-local/binutils-gdb/gdb/darwin-nat.c:1205:20: note: shadowed declaration is here
struct inferior *inf;
^~~
Fix it by moving the declaration of `inf` in the specific scopes that
need it. I think it's clearer this way anyway, as it shows that it's
not the same `inf` that is used in these different scopes.
Thanks to Iain Sandoe for reporting this. I did not see this error at
first, because I compile with the default system compiler on macOS,
which is clang. The compiler flag we try to enable for this is
`-Wshadow=local`, which is not one recognized by clang. I checked to
see if there would a version of the -Wshadow* warnings [1] we could
enable for clang, that would catch this, but the only one that would is
`-Wshadow` itself, and this is too invasive for us (which is why we
enabled just -Wshadow=local in the first place).
[1] https://clang.llvm.org/docs/DiagnosticsReference.html#wshadow
gdb/ChangeLog:
* darwin-nat.c (darwin_nat_target::wait_1): Move `inf`
declaration to narrower scopes.
The darwin-nat.c file doesn't build since the multi-target changes
(5b6d1e4f, "Multi-target support"). This patch makes it build. I have
access to a macOS vm, so I am able to build it, but I wasn't able to
successfully codesign it and try to actually debug something, so I don't
know if it works. I don't have much more time to put on this to figure
it out, so I thought I'd sent the patch anyway, as it's at least a step
in the right direction.
The bulk of the patch is to change a bunch of functions to be methods of
the darwin_nat_target object, so that this can pass `this` to
find_inferior_ptid and other functions that now require a
process_stratum_target pointer.
The darwin_ptrace_him function (renamed to darwin_nat_target::ptrace_him
in this patch) is passed to fork_inferior as the `init_trace_fun`
parameter. Since the method can't be passed as a plain function pointer
(we need the `this` pointer), I changed the `init_trace_fun` parameter
of fork_inferior to be a gdb::function_view, so we can pass a lambda and
capture `this`.
The changes in darwin-nat.h are only to move definition higher in the
file, so that forward declarations are not needed.
gdb/ChangeLog:
* darwin-nat.h (struct darwin_exception_msg, enum
darwin_msg_state, struct darwin_thread_info, darwin_thread_t):
Move up.
(class darwin_nat_target) <wait_1, check_new_threads,
decode_exception_message, decode_message, stop_inferior,
init_thread_list, ptrace_him, cancel_breakpoint>: Declare.
* darwin-nat.c (darwin_check_new_threads): Rename to...
(darwin_nat_target::check_new_threads): ... this.
(darwin_suspend_inferior_it): Remove.
(darwin_decode_exception_message): Rename to...
(darwin_nat_target::decode_exception_message): ... this.
(darwin_nat_target::resume): Pass target to find_inferior_ptid.
(darwin_decode_message): Rename to...
(darwin_nat_target::decode_message): ... this.
(cancel_breakpoint): Rename to...
(darwin_nat_target::cancel_breakpoint): ... this.
(darwin_wait): Rename to...
(darwin_nat_target::wait_1): ... this. Use range-based for loop
instead of iterate_over_inferiors.
(darwin_nat_target::wait): Call wait_1 instead of darwin_wait.
(darwin_stop_inferior): Rename to...
(darwin_nat_target::stop_inferior): ... this.
(darwin_nat_target::kill): Call wait_1 instead of darwin_wait.
(darwin_init_thread_list): Rename to...
(darwin_nat_target::init_thread_list): ... this.
(darwin_ptrace_him): Rename to...
(darwin_nat_target::ptrace_him): ... this.
(darwin_nat_target::create_inferior): Pass lambda function to
fork_inferior.
(darwin_nat_target::detach): Call stop_inferior instead of
darwin_stop_inferior.
* fork-inferior.h (fork_inferior): Change init_trace_fun
parameter to gdb::function_view.
* fork-inferior.c (fork_inferior): Likewise.
Each time a dll is loaded, update_solib_list is called.
This in turn calls deep down xfer_partial -> windows_xfer_shared_libraries,
which calls windows_xfer_shared_library for each loaded dll,
and pe_text_section_offset reads the dll for the text section offset.
Also if the data provided by xfer_partial is bigger than 4K,
then all of this is done for each 4K chunk (see target_read_alloc_1).
Caching of the text section offset improves the startup time of
an application with >300 dynamically loaded plugins from 2m10s to 10s.
And the shutdown time improves from 2m to 2s.
gdb/ChangeLog:
2020-01-23 Hannes Domani <ssbssa@yahoo.de>
* i386-cygwin-tdep.c (core_process_module_section): Update.
* windows-nat.c (struct lm_info_windows): Add text_offset.
(windows_xfer_shared_libraries): Update.
* windows-tdep.c (windows_xfer_shared_library):
Add text_offset_cached argument.
* windows-tdep.h (windows_xfer_shared_library): Update.
In commit
gdb: add back declarations for _initialize functions
6c2659886f
I wrongfully edited gdbarch.c, instead of editing gdbarch.sh and
re-generating gdbarch.c. This patch fixes gdbarch.sh to add a
declaration for _initialize_gdbarch. gdbarch.c is not changed, as the
output of gdbarch.sh now matches the current state of gdbarch.c.
gdb/ChangeLog:
* gdbarch.sh: Add declaration for _initialize_gdbarch.
This removes the two uses of iterate_over_inferiors, in favor of
range-based loops.
gdb/ChangeLog:
* remote-sim.c (check_for_duplicate_sim_descriptor): Remove.
(get_sim_inferior_data): Remove use of iterate_over_inferiors,
replace with range-based for.
(gdbsim_interrupt_inferior): Remove.
(gdbsim_target::interrupt): Replace iterate_over_inferiors use
with a range-based for. Inline code from
gdbsim_interrupt_inferior.
While GNU Source Highlight is good, it's also difficult to build and
distribute. For one thing, it needs Boost. For another, it has an
unusual configuration and installation setup.
Pygments, a Python library, doesn't suffer from these issues, and so I
thought it would be a reasonable fallback.
This patch implements this idea. GNU Source Highlight is preferred,
but if it is unavailable (or fails), the extension languages are
tried. This patch also implements support for Pygments.
Something similar could be done for Guile, using:
https://dthompson.us/projects/guile-syntax-highlight.html
However, I don't know enough about Guile internals to make this
happen, so I have not done it here.
gdb/ChangeLog
2020-01-21 Tom Tromey <tromey@adacore.com>
* source-cache.c (source_cache::ensure): Call ext_lang_colorize.
* python/python.c (python_extension_ops): Update.
(gdbpy_colorize): New function.
* python/lib/gdb/__init__.py (colorize): New function.
* extension.h (ext_lang_colorize): Declare.
* extension.c (ext_lang_colorize): New function.
* extension-priv.h (struct extension_language_ops) <colorize>: New
member.
* cli/cli-style.c (_initialize_cli_style): Update help text.
Change-Id: I5e21623ee05f1f66baaa6deaeca78b578c031bf4
As suggested, the cond variable is really supposed to be a bool. So,
make it so.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (struct aarch64_displaced_step_closure)
<cond>: Change type to bool.
(aarch64_displaced_step_b_cond): Update cond to use bool type.
(aarch64_displaced_step_cb): Likewise.
(aarch64_displaced_step_tb): Likewise.
While debugging the step-over-syscall problem, i wanted to see a bit more
debugging output to try to determine the root cause.
This patch does this.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (aarch64_displaced_step_fixup): Add more debugging
output.
In particular, this one:
FAIL: gdb.base/step-over-syscall.exp: fork: displaced=on: check_pc_after_cross_syscall: single step over fork final pc
When ptrace fork event reporting is enabled, GDB gets a PTRACE_EVENT_FORK
event whenever the inferior executes the fork syscall.
Then the logic is that GDB needs to step the inferior yet again in order to
receive a predetermined SIGTRAP, but no execution takes place because the
signal was already queued for delivery. That means the PC should stay the same.
I noticed the aarch64 code is currently adjusting the PC in this situation,
making the inferior skip an instruction without executing it.
The following change checks if we did not execute the instruction
(pc - to == 0), making proper adjustments for such case.
Regression tested on aarch64-linux-gnu on the tryserver.
gdb/ChangeLog:
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (struct aarch64_displaced_step_closure )
<pc_adjust>: Adjust the documentation.
(aarch64_displaced_step_fixup): Check if PC really moved before
adjusting it.
Commit 20135676fc ("PR24960, Memory leak
from disassembler") added "disassemble_free_target" to opcodes. This
is used to free target-specific data when finished with a
disassembler.
This patch changes gdb to call this function where needed.
gdb/ChangeLog
2020-01-19 Tom Tromey <tom@tromey.com>
* disasm.c (~gdb_disassembler): New destructor.
(gdb_buffered_insn_length): Call disassemble_free_target.
* disasm.h (class gdb_disassembler): Declare destructor. Use
DISABLE_COPY_AND_ASSIGN.
Change-Id: I245ba5b7dec5e5d9f29cd21832c6e2b4fecef047
init_cutu_and_read_dies takes a callback function, which I've always
found somewhat difficult to follow. This patch replaces this function
with a class, and changes the callers to use it. In some cases this
allows for the removal of a helper struct and helper function as well.
gdb/ChangeLog
2020-01-19 Tom Tromey <tom@tromey.com>
* dwarf2read.c (abbrev_table_up): Move typedef earlier.
(die_reader_func_ftype): Remove.
(cutu_reader): New class.
(dw2_get_file_names_reader): Remove "data" parameter.
(dw2_get_file_names): Use cutu_reader.
(create_debug_type_hash_table): Update.
(read_cutu_die_from_dwo): Update comment.
(lookup_dwo_unit): Add dwo_name parameter.
(cutu_reader::init_tu_and_read_dwo_dies): Now a method. Remove
die_reader_func_ftype and data parameters.
(cutu_reader::cutu_reader): Rename from init_cutu_and_read_dies.
Remove die_reader_func_ftype and data parameters.
(~cutu_reader): New; from init_cutu_and_read_dies.
(cutu_reader::cutu_reader): Rename from
init_cutu_and_read_dies_no_follow. Remove die_reader_func_ftype
and data parameters.
(init_cutu_and_read_dies_simple): Remove.
(struct process_psymtab_comp_unit_data): Remove.
(process_psymtab_comp_unit_reader): Remove data parameter; add
want_partial_unit and pretend_language parameters.
(process_psymtab_comp_unit): Use cutu_reader.
(build_type_psymtabs_reader): Remove data parameter.
(build_type_psymtabs_1): Use cutu_reader.
(process_skeletonless_type_unit): Likewise.
(load_partial_comp_unit_reader): Remove.
(load_partial_comp_unit): Use cutu_reader.
(load_full_comp_unit_reader): Remove.
(load_full_comp_unit): Use cutu_reader.
(struct create_dwo_cu_data): Remove.
(create_dwo_cu_reader): Remove datap parameter; add dwo_file and
dwo_unit parameters.
(create_cus_hash_table): Use cutu_reader.
(struct dwarf2_read_addr_index_data): Remove.
(dwarf2_read_addr_index_reader): Remove.
(dwarf2_read_addr_index): Use cutu_reader.
(read_signatured_type_reader): Remove.
(read_signatured_type): Use cutu_reader.
Change-Id: I4ef2f29e73108ce94bfe97799f8f638ed272212d
In some cases, the TUI flickers when redrawing. This can be seen
mostly easily when switching layouts.
This patch fixes the problem by exploiting the double buffering that
curses already does. In some spots, the TUI will now disable flushing
the curses buffers to the screen; and then flush them all at once when
the rendering is complete.
gdb/ChangeLog
2020-01-19 Tom Tromey <tom@tromey.com>
* tui/tui.c (tui_show_assembly): Use tui_suppress_output.
* tui/tui-wingeneral.h (class tui_suppress_output): New.
(tui_wrefresh): Declare.
* tui/tui-wingeneral.c (suppress_output): New global.
(tui_suppress_output, ~tui_suppress_output): New constructor and
destructor.
(tui_wrefresh): New function.
(tui_gen_win_info::refresh_window): Use tui_wrefresh.
(tui_gen_win_info::make_window): Call wnoutrefresh when needed.
* tui/tui-regs.h (struct tui_data_window) <no_refresh>: Declare
method.
* tui/tui-regs.c (tui_data_window::erase_data_content): Call
tui_wrefresh.
(tui_data_window::no_refresh): New method.
(tui_data_item_window::refresh_window): Call tui_wrefresh.
(tui_reg_command): Use tui_suppress_output
* tui/tui-layout.c (tui_set_layout): Use tui_suppress_output.
* tui/tui-data.h (struct tui_gen_win_info) <no_refresh>: New
method.
* tui/tui-command.c (tui_refresh_cmd_win): Call tui_wrefresh.
Change-Id: Icb832ae100b861de3af3307488e636fa928d5c9f
I noticed that a plain "file" will leave the current source file in
the TUI source window. Instead, I think, it should clear the source
window. This patch implements this.
gdb/ChangeLog
2020-01-19 Tom Tromey <tom@tromey.com>
* tui/tui-winsource.c (tui_update_source_windows_with_line):
Handle case where symtab is null.
gdb/testsuite/ChangeLog
2020-01-19 Tom Tromey <tom@tromey.com>
* gdb.tui/main.exp: Add check for plain "file".
Change-Id: I8424acf837f1a47f75bc6a833d1e917d4c10b51e
Unless I'm missing something, this function is a complicated way of
saying "fork_list.size () == 1".
gdb/ChangeLog:
* linux-fork.c (one_fork_p): Simplify.
Replace with range-based for loops.
gdb/ChangeLog:
* top.c (struct qt_args): Remove.
(kill_or_detach): Change return type to void, replace `void *`
parameter with a proper one.
(print_inferior_quit_action): Likewise.
(quit_confirm): Use range-based for loop to iterate over inferiors.
(quit_force): Likewise.
Replace with range-based loops.
gdb/ChangeLog:
* mi/mi-main.c (run_one_inferior): Change return type to void, replace
`void *` parameter with proper parameters.
(mi_cmd_exec_run): Use range-based loop to iterate over inferiors.
(print_one_inferior): Change return type to void, replace `void *`
parameter with proper parameters.
(mi_cmd_list_thread_groups): Use range-based loop to iterate over
inferiors.
(get_other_inferior): Remove.
(mi_cmd_remove_inferior): Use range-based loop to iterate over
inferiors.
Replace it with a range-based for. I've updated the comment in
mi_interp::init, which was a bit stale.
gdb/ChangeLog:
* mi/mi-interp.c (report_initial_inferior): Remove.
(mi_interp::init): Use range-based for to iterate over inferiors.
Tom Tromey
Joel Brobecker
Iain Buclaw
Tom Tromey
Shahab Vahedi
Christian Biesinger
Maciej W. Rozycki
Andrew Burgess
Simon Marchi
Alok Kumar Sharma
Pedro Alves
Luis Machado
Philippe Waroquiers
Simon Marchi
Hannes Domani