[gdb] Fix hang after ext sigkill

Consider the test-case from this patch, compiled with pthread support:
...
$ gcc gdb/testsuite/gdb.threads/killed-outside.c -lpthread -g
...

After running to all_started, we can print pid:
...
$ gdb a.out -ex "b all_started" -ex run -ex "delete 1" -ex "p pid"
...
Reading symbols from a.out...
Breakpoint 1 at 0x40072b: file killed-outside.c, line 29.
Starting program: /data/gdb_versions/devel/a.out
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff77fc700 (LWP 3155)]

Thread 1 "a.out" hit Breakpoint 1, all_started () at killed-outside.c:29
29      }
$1 = 3151
(gdb)
...

If we then kill the inferior using an external SIGKILL:
...
(gdb) shell kill -9 3151
...
and subsequently continue:
...
(gdb) c
Continuing.
Couldn't get registers: No such process.
Couldn't get registers: No such process.
(gdb) Couldn't get registers: No such process.
(gdb) Couldn't get registers: No such process.
(gdb) Couldn't get registers: No such process.
<repeat>
...
gdb hangs repeating the same warning.  Typing control-C no longer helps,
and we have to kill gdb.

This is a regression since commit 873657b9e8 "Preserve selected thread in
all-stop w/ background execution".  The commit adds a
scoped_restore_current_thread typed variable restore_thread to
fetch_inferior_event, and the hang is caused by the constructor throwing an
exception.

Fix this by catching the exception in the constructor.

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2020-04-21  Tom de Vries  <tdevries@suse.de>

PR gdb/25471
* thread.c
(scoped_restore_current_thread::scoped_restore_current_thread): Catch
exception in get_frame_id.

gdb/testsuite/ChangeLog:

2020-04-21  Tom de Vries  <tdevries@suse.de>

PR gdb/25471
* gdb.threads/killed-outside.c: New test.
* gdb.threads/killed-outside.exp: New file.

[gdb/testsuite] share jit-protocol.h by all jit tests

There was an existing jit-protocol.h defining common symbols needed for
JIT-supporting application, however, it was only used by few tests.
Others redeclared the same symbols.

This unifies all tests to use jit-protocol.h

gdb/testsuite/ChangeLog:

2020-02-18  Mihails Strasuns  <mihails.strasuns@intel.com>

* gdb.base/jit-attach-pie.c: Use jit-protocol.h.
* gdb.base/jit-elf-main.c: Use jit-protocol.h.
* gdb.base/jit-reader-host.c: Use jit-protocol.h.
* gdb.base/jit-reader-simple-jit.c: Use jit-protocol.h.
* gdb.base/jit-protocol.h: Update definitions to match all usage
  contexts.

[gdb/testsuite] structured rename of jit test files

Reorganizes how JIT related test files to be more clear what are related
to JIT reader system tests and what use JIT from ELF objfiles. Those two
approaches are quite different in GDB implementation and require very
different test setup. Keeping distinction clear at the file name level
makes it easier to maintain the testsuite.

gdb/testsuite/ChangeLog:

2020-02-18  Mihails Strasuns  <mihails.strasuns@intel.com>

* gdb.base: Rename all jit related test and source files.

[gdb/testsuite] allow more registers in gdb.base/jit-reader.exp

Fixes jit-reader test failures on systems that have more registers than
expected by the current condition.

On Intel i9-7920X the following extra registers are printed:

k0             0x0                 0
k1             0x0                 0
k2             0x0                 0
k3             0x0                 0
k4             0x0                 0
k5             0x0                 0
k6             0x0                 0
k7             0x0                 0

gdb/testsuite/ChangeLog:

2020-02-18  Mihails Strasuns  <mihails.strasuns@intel.com>

* gdb.base/jit-reader.exp: Relax register output check.

gas: Extend .symver directive

Extend .symver directive to update visibility of the original symbol and
assign one original symbol to different versioned symbols:

  .symver foo, foo@VERS_1, local    # Change foo to a local symbol.
  .symver foo, foo@VERS_2, hidden   # Change foo to a hidden symbol.
  .symver foo, foo@@VERS_3, remove  # Remove foo from symbol table.
  .symver foo, bar@V1               # Assign foo to bar@V1 and baz@V2.
  .symver foo, baz@V2

PR gas/23840
PR gas/25295
* NEWS: Mention .symver extension.
* config/obj-elf.c (obj_elf_find_and_add_versioned_name): New
function.
(obj_elf_symver): Call obj_elf_find_and_add_versioned_name to
add a version name.  Add local, hidden and remove visibility
support.
(elf_frob_symbol): Handle the list of version names.  Update the
original symbol to local, hidden or remove it from the symbol
table.
(elf_frob_file_before_adjust): Handle the list of version names.
* config/obj-elf.h (elf_visibility): New.
(elf_versioned_name_list): Likewise.
(elf_obj_sy): Change local to bitfield. Add rename, bad_version
and visibility.  Change versioned_name pointer to struct
elf_versioned_name_list.
* doc/as.texi: Update .symver directive.
* testsuite/gas/symver/symver.exp: Run all *.d tests.  Add more
error checking tests.
* testsuite/gas/symver/symver6.d: New file.
* testsuite/gas/symver/symver7.d: Likewise.
* testsuite/gas/symver/symver7.s: Likewise.
* testsuite/gas/symver/symver8.d: Likewise.
* testsuite/gas/symver/symver8.s: Likewise.
* testsuite/gas/symver/symver9.s: Likewise.
* testsuite/gas/symver/symver9a.d: Likewise.
* testsuite/gas/symver/symver9b.d: Likewise.
* testsuite/gas/symver/symver10.s: Likewise.
* testsuite/gas/symver/symver10a.d: Likewise.
* testsuite/gas/symver/symver10b.d: Likewise.
* testsuite/gas/symver/symver11.d: Likewise.
* testsuite/gas/symver/symver11.s: Likewise.
* testsuite/gas/symver/symver12.d: Likewise.
* testsuite/gas/symver/symver12.s: Likewise.
* testsuite/gas/symver/symver13.d: Likewise.
* testsuite/gas/symver/symver13.s: Likewise.
* testsuite/gas/symver/symver14.d: Likewise.
* testsuite/gas/symver/symver14.l: Likewise.
* testsuite/gas/symver/symver15.d: Likewise.
* testsuite/gas/symver/symver15.l: Likewise.
* testsuite/gas/symver/symver6.l: Removed.
* testsuite/gas/symver/symver6.s: Updated.

elf: Strip zero-sized dynamic sections

ELF size_dynamic_sections is called by the ELF backend linker after all
the linker input files have been seen but before the section sizes have
been set.  After the sections sizes have been set, target-specific,
global optimizations may make some dynamic sections zero-sized if they
are no longer needed.

Add ELF strip_zero_sized_dynamic_sections so that ELF backend linker can
strip zero-sized dynamic sections after the sections sizes have been set.

bfd/

PR ld/25849
* elf-bfd.h (elf_backend_data): Add
elf_backend_strip_zero_sized_dynamic_sections.
(_bfd_elf_strip_zero_sized_dynamic_sections): New prototype.
* elf64-alpha.c (elf_backend_strip_zero_sized_dynamic_sections):
New macro.
* elflink.c (_bfd_elf_strip_zero_sized_dynamic_sections): New
function.
* elfxx-target.h (elf_backend_strip_zero_sized_dynamic_sections):
New macro.
(elfNN_bed): Add elf_backend_strip_zero_sized_dynamic_sections.

ld/

PR ld/25849
* ldelfgen.c (ldelf_map_segments): Call
elf_backend_strip_zero_sized_dynamic_sections.
* testsuite/ld-alpha/tlsbinr.rd: Updated.

alpha: Warn DT_TEXTREL with -M

This fixes:

FAIL: DT_TEXTREL map file warning

* elf64-alpha.c (alpha_elf_reloc_entry): Replace reltext with
sec.
(elf64_alpha_check_relocs): Set sec instead of reltext.  Warn
DT_TEXTREL with -M.
(elf64_alpha_calc_dynrel_sizes): Warn DT_TEXTREL with -M.

Updated Serbian translation for the BFD directory.

Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure.

PR 25830
* configure.ac (noconfigdirs): Exclude gdb & gprof for pdp11.
* configure: Rebuild.

Remove SH-5 remnants

git commit 211dc24b87 removed most sh5 and sh64 SuperH support, after
they were obsoleted by git commit 2b213129c5.  This patch removes a
few remaining pieces that should have gone with 211dc24b87.

include/
* elf/sh.h (STO_SH5_ISA32, SHF_SH5_ISA32, SHF_SH5_ISA32_MIXED),
(SHT_SH5_CR_SORTED, STT_DATALABEL): Delete.
bfd/
* elf32-sh.c (sh_elf_relocate_section): Remove STO_SH5_ISA32
processing.

Automatic date update in version.in

Mark move constructors as "noexcept"

I recently learned that move constructors generally should be marked
"noexcept".  This ensures that standard containers will move objects
when possible, rather than copy them.

This patch fixes the cases I could find.  Note that implicitly-defined
or defaulted move constructors will automatically do what you'd
expect; that is, they are noexcept if all the members have noexcept
move constructors.

While doing this, I noticed a couple of odd cases where the move
constructor seemed to assume that the object being constructed could
have state requiring destruction.  I've fixed these as well.  See
completion_result and scoped_mmap.

gdb/ChangeLog
2020-04-20  Tom Tromey  <tromey@adacore.com>

* python/python.c (struct gdbpy_event): Mark move constructor as
noexcept.
* python/py-tui.c (class gdbpy_tui_window_maker): Mark move
constructor as noexcept.
* completer.h (struct completion_result): Mark move constructor as
noexcept.
* completer.c (completion_result::completion_result): Use
initialization style.  Don't call reset_match_list.

gdbsupport/ChangeLog
2020-04-20  Tom Tromey  <tromey@adacore.com>

* scoped_mmap.h (scoped_mmap): Mark move constructor as noexcept.
Use initialization style.  Don't call destroy.
* scoped_fd.h (class scoped_fd): Mark move constructor as
noexcept.
* gdb_ref_ptr.h (class ref_ptr): Mark move constructor as
noexcept.

Use support_nested_function_tests in gdb.base/nested-subp1.exp et al

This commit updates gdb.base/nested-subp[1-3].exp to determine
whether whether nested functions are supported using the function
support_nested_function_tests.

gdb/testsuite/ChangeLog:

* gdb.base/nested-subp1.exp: Use support_nested_function_tests.
* gdb.base/nested-subp2.exp: Likewise.
* gdb.base/nested-subp3.exp: Likewise.

Disable nested function tests for clang

Clang does not support nested functions, and there are no plans to
change this.  This commit disables the three nested function tests
when using clang.

gdb/testsuite/ChangeLog:

* gdb.base/nested-subp1.exp: Disable test when using clang.
* gdb.base/nested-subp2.exp: Likewise.
* gdb.base/nested-subp3.exp: Likewise.

Add myself to gdb/MAINTAINERS

2020-04-20  Mihails Strasuns  <mihails.strasuns@intel.com>

* MAINTAINERS (Write After Approval): Add myself.

Change-Id: I3f412e328b42dea875a6d7cb74fc55415865f134

Fix ChangeLog entry for commit fa93cc8f35dbed69c3c47aa803686d87f2143779

gdb: fix tabs vs spaces in ChangeLog

Fix compilation error with clang in gdb/testsuite/gdb.cp/exception.cc

Clang fails to compile the above file, with the following error:
  warning: using directive refers to implicitly-defined namespace 'std'

This prevents the following testcase from executing:
  gdb.cp/exception.exp

Fix compilation error with clang in gdb/testsuite/gdb.trace/tspeed.c

Clang fails to compile the above file, with the following error:
  warning: using the result of an assignment as a condition without
  parentheses [-Wparentheses]

This prevents the following testcase from executing:
  gdb.trace/tspeed.exp

Fix compilation error with clang in gdb/testsuite/gdb.base/jit-main.c

Clang fails to compile the above file, with the following error:
  warning: while loop has empty body [-Wempty-body]

This prevents the following testcases from executing:
  gdb.base/jit.exp
  gdb.base/jit-so.exp

When bfd/pdp11.c was copied from bfd/aoutx.h, the #defines for external symbol types N_TEXT etc. were #undef'd and then #define'd with new values.  But N_STAB was not changed even though the new value for N_EXT overlapped with it.  This caused aout_link_write_symbols() to treat global symbols referenced in the source but defined in a linker script as undefined.

Separately, in translate_symbol_table() the 16-bit symbol values were sign extended to unsigned long (e.g., 64 bits) when they really should be treated as unsigned so the value remains 16 bits.

PR 25828
* pdp11.c (N_STAB): Modify value to avoid conflict with N_EXT
causing globals from linker script to be treated as debug symbols.
(translate_symbol_table): Don't sign-extend symbol values from 16
to 64 bits in nm output.

[AArch64, Binutils] Add missing TSB instruction

This patch implements the TSB instructions:
https://developer.arm.com/docs/ddi0596/f/base-instructions-alphabetic-order/
tsb-csync-trace-synchronization-barrier
Since TSB and PSB both use the same (and only) argument "CSYNC", this patch
reuses it for TSB. However, the same argument would imply different value
for CRm:Op2 which are anyway fixed values, so I have diverted the
inserter/extracter function to dummy versions instead of the "hint" version.
The operand checker part still uses the existing infratructure for
AARCH64_OPND_BARRIER_PSB to make sure the operand is parsed correctly.

gas/ChangeLog:

2020-04-20  Sudakshina Das  <sudi.das@arm.com>

* config/tc-aarch64.c (parse_barrier_psb): Update error messages
to include TSB.
* testsuite/gas/aarch64/system-2.d: Update -march and new tsb tests.
* testsuite/gas/aarch64/system-2.s: Add new tsb tests.
* testsuite/gas/aarch64/system.d: Update.

opcodes/ChangeLog:

2020-04-20  Sudakshina Das  <sudi.das@arm.com>

* aarch64-asm.c (aarch64_ins_none): New.
* aarch64-asm.h (ins_none): New declaration.
* aarch64-dis.c (aarch64_ext_none): New.
* aarch64-dis.h (ext_none): New declaration.
* aarch64-opc.c (aarch64_print_operand): Update case for
AARCH64_OPND_BARRIER_PSB.
* aarch64-tbl.h (aarch64_opcode_table): Add tsb.
(AARCH64_OPERANDS): Update inserter/extracter for
AARCH64_OPND_BARRIER_PSB to use new dummy functions.
* aarch64-asm-2.c: Regenerated.
* aarch64-dis-2.c: Regenerated.
* aarch64-opc-2.c: Regenerated.

[AArch64, Binutils] Make hint space instructions valid for Armv8-a

There are a few instruction in AArch64 that are in the HINT space. Any of
these instructions should be accepted by the assembler/disassembler at any
architecture version. This patch fixes the existing instructions that are
not behaving accordingly.
I have used all of the instructions mentioned in the following to make the
changes:
https://developer.arm.com/docs/ddi0596/f/base-instructions-alphabetic-order/
hint-hint-instruction

gas/ChangeLog:

2020-04-20  Sudakshina Das  <sudi.das@arm.com>

* testsuite/gas/aarch64/bti.d: Update -march option.
* testsuite/gas/aarch64/illegal-bti.d: Remove.
* testsuite/gas/aarch64/illegal-bti.l: Remove.
* testsuite/gas/aarch64/illegal-ras-1.l: Remove esb.
* testsuite/gas/aarch64/illegal-ras-1.s: Remove esb.

opcodes/ChangeLog:

2020-04-20  Sudakshina Das  <sudi.das@arm.com>

* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): Remove.
(aarch64_feature_ras, RAS): Likewise.
(aarch64_feature_stat_profile, STAT_PROFILE): Likewise.
(aarch64_opcode_table): Update bti, xpaclri, pacia1716, pacib1716,
autia1716, autib1716, esb, psb, dgh, paciaz, paciasp, pacibz, pacibsp,
autiaz, autiasp, autibz, autibsp to be CORE_INSN.
* aarch64-asm-2.c: Regenerated.
* aarch64-dis-2.c: Regenerated.
* aarch64-opc-2.c: Regenerated.

fix typo last commit

readelf: segfault at readelf.c:12227

This is another one where not cleaning up sufficiently after
processing one file can lead to errors when processing the next file.
We have ngnuchains non-zero but gnuchains NULL in the following:
  off < ngnuchains && (gnuchains[off] & 1) == 0

* readelf.c (process_symbol_table): Clear ngnuchains, ngnubuckets
and nbuckets.

readelf: segfaults fuzzing multiple object files

This patch is aimed at fixing a number of oss-fuzz segfaults that
don't reproduce reliably with their current infrastructure, the
problem being that one invocation of readelf is effectively being run
on multiple object files.  I believe that these segfaults could be
reliably reproduced with just two fuzzed objects being presented to
readelf, but those inputs are currently not identified by oss-fuzz.
So there is some guesswork involved in this patch.  The idea here is
to clear stashed data such as symtab_shndx_list that is processed
using section header info, at the same time that header info is
cleared.

* readelf.c (process_section_headers): Free dynamic symbols etc.
earlier.

Automatic date update in version.in

readelf memory leaks

This fixes two leaks found in the new code supporting display of
dynamic symbols retrieved via dynamic tags.

* readelf.c (get_num_dynamic_syms): Formatting.  Don't return
on error without freeing.
(process_dynamic_section): Don't recreate dynamic symbols from
dynamic tag info when the dynamic symbols have already been
read via section headers.

PowerPC64: remove empty .rela.dyn (.rela.branch_lt)

Stripping .rela.branch_lt is easy enough but messes with the
testsuite due to stub symbols (that use section id) changing.  Tests
that run on more than one target variant can be tricky to fix, this
renaming happened to work.

bfd/
* elf64-ppc.c (ppc64_elf_size_stubs): Strip relbrlt too.
ld/
* testsuite/ld-powerpc/tlsopt5.s: Rename foo to aaaaa.
* testsuite/ld-powerpc/tlsopt5.d: Adjust to suit.
* testsuite/ld-powerpc/tlsopt6.d: Likewise.

Restore some windows-tdep.c code

When I removed init_w32_command_list, I weirdly neglected to see if it
was called anywhere else.  This patch restores the function, which is
called from windows-nat.c.  Sorry about the breakage.

Is it possible to have a windows-native gdb that isn't also using
windows-tdep?

Anyway, I'm checking this in.

gdb/ChangeLog
2020-04-18  Tom Tromey  <tom@tromey.com>

* windows-tdep.c (init_w32_command_list)
(w32_prefix_command_valid): Restore.
(_initialize_windows_tdep): Call init_w32_command_list.

Automatic date update in version.in

ld: Don't xfail ld-elf/warn[12] on 64-bit Solaris/SPARC

Two ld tests currently XPASS on 64-bit Solaris/SPARC:

XPASS: ld-elf/warn1
XPASS: ld-elf/warn2

They were xfail'ed on Solaris/SPARCv9 back in 2005

https://sourceware.org/pipermail/binutils/2005-February/039268.html

but obviously this no longer appplies.

Fixed by removing the xfail's.

Tested on sparcv9-sun-solaris2.11 and sparc-sun-solaris2.11.

* testsuite/ld-elf/warn1.d: Don't xfail on 64-bit Solaris/SPARC.
* testsuite/ld-elf/warn2.d: Likewise.

elf: Don't use .set for alpha target

Since the .set directive of ELF/alpha target is different, define NO_SET
to 1 to use "=" for ELF/alpha target.

* testsuite/ld-elf/elf.exp (ASFLAGS): Add "--defsym NO_SET=1" for
alpha target.
* testsuite/ld-elf/pr19789.s: Use "=" if NO_SET is defined.

Change get_objfile_arch to a method on objfile

This changes get_objfile_arch to be a new inline method,
objfile::arch.

To my surprise, this function came up while profiling DWARF psymbol
reading.  Making this change improved performance from 1.986 seconds
to 1.869 seconds.  Both measurements were done by taking the mean of
10 runs on a fixed copy of the gdb executable.

gdb/ChangeLog
2020-04-18  Tom Tromey  <tom@tromey.com>

* xcoffread.c (enter_line_range, scan_xcoff_symtab): Update.
* value.c (value_fn_field): Update.
* valops.c (find_function_in_inferior)
(value_allocate_space_in_inferior): Update.
* tui/tui-winsource.c (tui_update_source_windows_with_line):
Update.
* tui/tui-source.c (tui_source_window::set_contents): Update.
* symtab.c (lookup_global_or_static_symbol)
(find_function_start_sal_1, skip_prologue_sal)
(print_msymbol_info, find_gnu_ifunc, symbol_arch): Update.
* symmisc.c (dump_msymbols, dump_symtab_1)
(maintenance_print_one_line_table): Update.
* symfile.c (init_entry_point_info, section_is_mapped)
(list_overlays_command, simple_read_overlay_table)
(simple_overlay_update_1): Update.
* stap-probe.c (handle_stap_probe): Update.
* stabsread.c (dbx_init_float_type, define_symbol)
(read_one_struct_field, read_enum_type, read_range_type): Update.
* source.c (info_line_command): Update.
* python/python.c (gdbpy_source_objfile_script)
(gdbpy_execute_objfile_script): Update.
* python/py-type.c (save_objfile_types): Update.
* python/py-objfile.c (py_free_objfile): Update.
* python/py-inferior.c (python_new_objfile): Update.
* psymtab.c (psym_find_pc_sect_compunit_symtab, dump_psymtab)
(dump_psymtab_addrmap_1, maintenance_info_psymtabs)
(maintenance_check_psymtabs): Update.
* printcmd.c (info_address_command): Update.
* objfiles.h (struct objfile) <arch>: New method, from
get_objfile_arch.
(get_objfile_arch): Don't declare.
* objfiles.c (get_objfile_arch): Remove.
(filter_overlapping_sections): Update.
* minsyms.c (msymbol_is_function): Update.
* mi/mi-symbol-cmds.c (mi_cmd_symbol_list_lines)
(output_nondebug_symbol): Update.
* mdebugread.c (parse_symbol, basic_type, parse_partial_symbols)
(mdebug_expand_psymtab): Update.
* machoread.c (macho_add_oso_symfile): Update.
* linux-tdep.c (linux_infcall_mmap, linux_infcall_munmap):
Update.
* linux-fork.c (checkpoint_command): Update.
* linespec.c (convert_linespec_to_sals): Update.
* jit.c (finalize_symtab): Update.
* infrun.c (insert_exception_resume_from_probe): Update.
* ia64-tdep.c (ia64_find_unwind_table): Update.
* hppa-tdep.c (internalize_unwinds): Update.
* gdbtypes.c (get_type_arch, init_float_type, objfile_type):
Update.
* gcore.c (call_target_sbrk): Update.
* elfread.c (record_minimal_symbol, elf_symtab_read)
(elf_rel_plt_read, elf_gnu_ifunc_record_cache)
(elf_gnu_ifunc_resolve_by_got): Update.
* dwarf2/read.c (create_addrmap_from_index)
(create_addrmap_from_aranges, dw2_find_pc_sect_compunit_symtab)
(read_debug_names_from_section)
(process_psymtab_comp_unit_reader, add_partial_symbol)
(add_partial_subprogram, process_full_comp_unit)
(read_file_scope, read_func_scope, read_lexical_block_scope)
(read_call_site_scope, dwarf2_ranges_read)
(dwarf2_record_block_ranges, dwarf2_add_field)
(mark_common_block_symbol_computed, read_tag_pointer_type)
(read_tag_string_type, dwarf2_init_float_type)
(dwarf2_init_complex_target_type, read_base_type)
(partial_die_info::read, partial_die_info::read)
(read_attribute_value, dwarf_decode_lines_1, new_symbol)
(dwarf2_fetch_die_loc_sect_off): Update.
* dwarf2/loc.c (dwarf2_find_location_expression)
(class dwarf_evaluate_loc_desc, rw_pieced_value)
(dwarf2_evaluate_loc_desc_full, dwarf2_locexpr_baton_eval)
(dwarf2_loc_desc_get_symbol_read_needs)
(locexpr_describe_location_piece, locexpr_describe_location_1)
(loclist_describe_location): Update.
* dwarf2/index-write.c (write_debug_names): Update.
* dwarf2/frame.c (dwarf2_build_frame_info): Update.
* dtrace-probe.c (dtrace_process_dof): Update.
* dbxread.c (read_dbx_symtab, dbx_end_psymtab)
(process_one_symbol): Update.
* ctfread.c (ctf_init_float_type, read_base_type): Update.
* coffread.c (coff_symtab_read, enter_linenos, decode_base_type)
(coff_read_enum_type): Update.
* cli/cli-cmds.c (edit_command, list_command): Update.
* buildsym.c (buildsym_compunit::finish_block_internal): Update.
* breakpoint.c (create_overlay_event_breakpoint)
(create_longjmp_master_breakpoint)
(create_std_terminate_master_breakpoint)
(create_exception_master_breakpoint, get_sal_arch): Update.
* block.c (block_gdbarch): Update.
* annotate.c (annotate_source_line): Update.

bfd_is_const_section thinko

* section.c (bfd_is_const_section): Correct test for special
sections.
* bfd-in2.h: Regenerate.

Automatic date update in version.in

Fix gdb.base/attach-twice.c build on NetBSD

Add a fallback definition of PTRACE_ATTACH that is an alias of
PT_ATTACH. Change the 4th argument of ptrace(2) to 0 as it is
compatible with void * (Linux) and int (NetBSD) arguments.

Include <sys/types.h> for <sys/ptrace.h>.

gdb/testsuite/ChangeLog:

* gdb.base/attach-twice.c: Include "sys/types.h".
(PTRACE_ATTACH): Add fallback definition.
(main): Pass `0' to the 4th argument of `ptrace'.

Fix the build of fork-running-state.c on NetBSD

Include <signal.h> for kill(2).

gdb/testsuite/ChangeLog:

        * gdb.base/fork-running-state.c: Include "signal.h".

Replace most calls to help_list and cmd_show_list

Currently there are many prefix commands that do nothing but call
either help_list or cmd_show_list.  I happened to notice that one such
call, for "set print type", used the wrong command list parameter,
causing incorrect output.

Rather than fix this bug in isolation, I decided to eliminate this
possibility by adding two new ways to add prefix commands, which
simply route the call to help_list or cmd_show_list, as appropriate.
This makes it impossible for a mismatch to occur.

In some cases, a bit of output was removed; however, I don't think
this output in general was very useful.  It seemed redundant with
what's already printed by help_list.  A representative example is this
hunk, removed from ada-lang.c:

-  printf_unfiltered (_(\
-"\"set ada\" must be followed by the name of a setting.\n"));

This simplified the CLI style set/show commands quite a bit, and
allowed the deletion of a macro.

This also cleans up some unusual code in windows-tdep.c.

Tested on x86-64 Fedora 30.  Note that I have no way to build the
go32-nat.c change.

gdb/ChangeLog
2020-04-17  Tom Tromey  <tromey@adacore.com>

* auto-load.c (show_auto_load_cmd): Remove.
(auto_load_show_cmdlist_get): Use add_show_prefix_cmd.
* arc-tdep.c (_initialize_arc_tdep): Use add_show_prefix_cmd.
(maintenance_print_arc_command): Remove.
* tui/tui-win.c (tui_command): Remove.
(tui_get_cmd_list): Use add_basic_prefix_cmd.
* tui/tui-layout.c (tui_layout_command): Remove.
(_initialize_tui_layout): Use add_basic_prefix_cmd.
* python/python.c (user_set_python, user_show_python): Remove.
(_initialize_python): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* guile/guile.c (set_guile_command, show_guile_command): Remove.
(install_gdb_commands): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(info_guile_command): Remove.
* dwarf2/read.c (set_dwarf_cmd, show_dwarf_cmd): Remove.
(_initialize_dwarf2_read): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* cli/cli-style.h (class cli_style_option) <add_setshow_commands>:
Remove do_set and do_show parameters.
* cli/cli-style.c (set_style, show_style): Remove.
(_initialize_cli_style): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(cli_style_option::add_setshow_commands): Remove do_set and
do_show parameters.
(cli_style_option::add_setshow_commands): Use
add_basic_prefix_cmd, add_show_prefix_cmd.
(STYLE_ADD_SETSHOW_COMMANDS): Remove macro.
(set_style_name): Remove.
* cli/cli-dump.c (dump_command, append_command): Remove.
(srec_dump_command, ihex_dump_command, verilog_dump_command)
(tekhex_dump_command, binary_dump_command)
(binary_append_command): Remove.
(_initialize_cli_dump): Use add_basic_prefix_cmd.
* windows-tdep.c (w32_prefix_command_valid): Remove global.
(init_w32_command_list): Remove; move into ...
(_initialize_windows_tdep): ... here.  Use add_basic_prefix_cmd.
* valprint.c (set_print, show_print, set_print_raw)
(show_print_raw): Remove.
(_initialize_valprint): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* typeprint.c (set_print_type, show_print_type): Remove.
(_initialize_typeprint): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* record.c (set_record_command, show_record_command): Remove.
(_initialize_record): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* cli/cli-cmds.c (_initialize_cli_cmds): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(info_command, show_command, set_debug, show_debug): Remove.
* top.h (set_history, show_history): Don't declare.
* top.c (set_history, show_history): Remove.
* target-descriptions.c (set_tdesc_cmd, show_tdesc_cmd)
(unset_tdesc_cmd): Remove.
(_initialize_target_descriptions): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* symtab.c (info_module_command): Remove.
(_initialize_symtab): Use add_basic_prefix_cmd.
* symfile.c (overlay_command): Remove.
(_initialize_symfile): Use add_basic_prefix_cmd.
* sparc64-tdep.c (info_adi_command): Remove.
(_initialize_sparc64_adi_tdep): Use add_basic_prefix_cmd.
* sh-tdep.c (show_sh_command, set_sh_command): Remove.
(_initialize_sh_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* serial.c (serial_set_cmd, serial_show_cmd): Remove.
(_initialize_serial): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* ser-tcp.c (set_tcp_cmd, show_tcp_cmd): Remove.
(_initialize_ser_tcp): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* rs6000-tdep.c (set_powerpc_command, show_powerpc_command)
(_initialize_rs6000_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* riscv-tdep.c (show_riscv_command, set_riscv_command)
(show_debug_riscv_command, set_debug_riscv_command): Remove.
(_initialize_riscv_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* remote.c (remote_command, set_remote_cmd): Remove.
(_initialize_remote): Use add_basic_prefix_cmd.
* record-full.c (set_record_full_command)
(show_record_full_command): Remove.
(_initialize_record_full): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* record-btrace.c (cmd_set_record_btrace)
(cmd_show_record_btrace, cmd_set_record_btrace_bts)
(cmd_show_record_btrace_bts, cmd_set_record_btrace_pt)
(cmd_show_record_btrace_pt): Remove.
(_initialize_record_btrace): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* ravenscar-thread.c (set_ravenscar_command)
(show_ravenscar_command): Remove.
(_initialize_ravenscar): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* mips-tdep.c (show_mips_command, set_mips_command)
(_initialize_mips_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* maint.c (maintenance_command, maintenance_info_command)
(maintenance_check_command, maintenance_print_command)
(maintenance_set_cmd, maintenance_show_cmd): Remove.
(_initialize_maint_cmds): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
(show_per_command_cmd): Remove.
* maint-test-settings.c (maintenance_set_test_settings_cmd):
Remove.
(maintenance_show_test_settings_cmd): Remove.
(_initialize_maint_test_settings): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* maint-test-options.c (maintenance_test_options_command):
Remove.
(_initialize_maint_test_options): Use add_basic_prefix_cmd.
* macrocmd.c (macro_command): Remove
(_initialize_macrocmd): Use add_basic_prefix_cmd.
* language.c (set_check, show_check): Remove.
(_initialize_language): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* infcmd.c (unset_command): Remove.
(_initialize_infcmd): Use add_basic_prefix_cmd.
* i386-tdep.c (set_mpx_cmd, show_mpx_cmd): Remove.
(_initialize_i386_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* go32-nat.c (go32_info_dos_command): Remove.
(_initialize_go32_nat): Use add_basic_prefix_cmd.
* cli/cli-decode.c (do_prefix_cmd, add_basic_prefix_cmd)
(do_show_prefix_cmd, add_show_prefix_cmd): New functions.
* frame.c (set_backtrace_cmd, show_backtrace_cmd): Remove.
(_initialize_frame): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* dcache.c (set_dcache_command, show_dcache_command): Remove.
(_initialize_dcache): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* cp-support.c (maint_cplus_command): Remove.
(_initialize_cp_support): Use add_basic_prefix_cmd.
* btrace.c (maint_btrace_cmd, maint_btrace_set_cmd)
(maint_btrace_show_cmd, maint_btrace_pt_set_cmd)
(maint_btrace_pt_show_cmd, _initialize_btrace): Use
add_basic_prefix_cmd, add_show_prefix_cmd.
* breakpoint.c (save_command): Remove.
(_initialize_breakpoint): Use add_basic_prefix_cmd.
* arm-tdep.c (set_arm_command, show_arm_command): Remove.
(_initialize_arm_tdep): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* ada-lang.c (maint_set_ada_cmd, maint_show_ada_cmd)
(set_ada_command, show_ada_command): Remove.
(_initialize_ada_language): Use add_basic_prefix_cmd,
add_show_prefix_cmd.
* command.h (add_basic_prefix_cmd, add_show_prefix_cmd): Declare.

gdb/testsuite/ChangeLog
2020-04-17  Tom Tromey  <tromey@adacore.com>

* gdb.cp/maint.exp (test_help): Simplify multiple_help_body.
Update tests.
* gdb.btrace/cpu.exp: Update tests.
* gdb.base/maint.exp: Update tests.
* gdb.base/default.exp: Update tests.
* gdb.base/completion.exp: Update tests.

[PATCH v2] binutils: arm: Fix disassembly of conditional VDUPs.

VDUP (neon) instructions can be conditional, but this is not taken into
account in the current master. This commit fixes that by i) fixing the
VDUP instruction masks and ii) adding logic for disassembling
conditional neon instructions.

opcodes * arm-dis.c (neon_opcodes): Fix VDUP instruction masks.
(print_insn_neon): Support disassembly of conditional
instructions.

binutils* testsuite/binutils-all/arm/vdup-cond.d: New test for testing that
conditional VDUP instructions are disassembled correctly.
* testsuite/binutils-all/arm/vdup-cond.s: New file used by
vdup-cond.d.
* testsuite/binutils-all/arm/vdup-thumb.d: New test for testing
that VDUP instructions (which are conditional in A32) can be
disassembled in thumb mode.
* testsuite/binutils-all/arm/vdup-cond.s: New file used by
vdup-thumb.d.

Fix the test for PR 18963 so that it will work on 16-bit targets.

PR 18963
* testsuite/ld-scripts/pr18963.t: Reduce section sizes to fit in
16-bit address space.
* testsuite/ld-scripts/pr18963.d: Likewise.

Revert "Fix the test for PR 18963 so that it will work on 16-bit targets."

This reverts commit 7a1a12f4d1c6152017142d74c736dc1cc6b0e81c.

[PATCH 1/2] coff-go32: update ldscript

* scripttempl/i386go32.sc: Provide symbol _environ.  Link in
.ctors and .dtors.  Discard LTO sections.

 Commit: Running the linker testsuite with clang

* testsuite/config/default.exp: If not already set then create the
CCC_OVERRIDE_OPTIONS environment variable to help when running the
testsuite with clang.
* testsuite/ld-elf/pr22269-1.c: Add a missing return statement.
* testsuite/ld-elfvers/vers.exp: Add checks to detect if files
were built before attempting to copy them.

Remove obsolete and unused inf_ptrace_target::auxv_parse

The only two potential users (NetBSD, OpenBSD) use svr4_auxv_parse.

gdb/ChangeLog:

        * nbsd-nat.c (inf_ptrace_target::auxv_parse): Remove.
        * nbsd-nat.h (inf_ptrace_target::auxv_parse): Likewise.

bfin: allow ".=.+delta"

BFIN has lots of instructions that contain "=", so "sym = expression"
is disabled for that target.  This makes an exception for assignment
to dot, fixing the recent regression of ld-scripts/pr18963.

* config/tc-bfin.h (TC_EQUAL_IN_INSN): Allow assignment to dot.

PR25842, Null pointer dereference in nm-new

PR 25842
* elf.c (_bfd_elf_get_symbol_version_string): Don't segfault on
NULL nodename.

PR25840, Null pointer dereference in objdump

PR 25840
* debug.c (debug_class_type_samep): Don't segfault on NULL type.

Automatic date update in version.in

gdb: is_linked_with_cygwin_dll: mention filename in warning messages

When a warning is displayed, it isn't clear to the user which file is
the cause of the warning.  Add the filename in there.  Remove the
"Failed to parse .idata section" part, since the .idata section is
always mentioned one way or another anyway, so it just contributes to
make the message longer than it needs to be.

gdb/ChangeLog:

* windows-tdep.c (is_linked_with_cygwin_dll): Add filename to
warning messages.

gdb: is_linked_with_cygwin_dll: handle import table not at beginning of .idata section

When loading the file C:\Windows\SysWOW64\msvcrt.dll, taken from a
Windows 10 system, into GDB, we get the following warning:

    warning: Failed to parse .idata section: name's virtual address (0x0) is outside .idata section's range [0xb82b8, 0xb97f0[.

This uncovers an issue with how we parse the import table, part of the
.idata section.  Right now, we assume that the import table is located
at the beginning of the section.  That was the case in everything I had
tried so far, but this file is an example where that's not true.

We need to compute the offset of the import table within the .idata
section, and start there, instead of at the beginning of the .idata
section.  Using the file mentioned above, this is the values we have to
work with:

  A) bfd_section_vma (idata_section)    101b8000
  B) Import table's virtual address        b82b8
  C) Image base                         10100000

The virtual address that BFD returns us for the section has the image
base applied, so we need to subtract it first.  The offset of the table
in the section is therefore:

    B - (A - C)

This patch implements that.

gdb/ChangeLog:

* windows-tdep.c (is_linked_with_cygwin_dll): Consider case where
import table is not at beginning of .idata section.

Stop the MIPS assembler from accepting ifunc symbols.

PR 25803
gas * config/obj-elf.c (obj_elf_type): Reject ifunc symbols on MIPS
targets.
* testsuite/gas/elf/elf.exp: Add MIPS targets to the list to skip
for the type-2 test.
* testsuite/gas/elf/type-noifunc.e: Update to allow for MIPS
targets running this test.

bfd * elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol): Replace an
abort with a more helpful error message.

Fix the test for PR 18963 so that it will work on 16-bit targets.

PR ld/18963
* testsuite/ld-scripts/pr18963.s: New, replaces empty data.s to
allocate space in text, data, bss here rather than pr18963.t.
* testsuite/ld-scripts/pr18963.t: Remove assignments to dot.
* testsuite/ld-scripts/pr18963.d: Change addresses to fit 16 bits.

Refactor delete_program_space as a destructor

Currently, while the program_space's ctor adds the new pspace to the
pspaces list, the destructor doesn't remove the pspace from the pspace
list.  Instead, you're supposed to use delete_program_space, to both
remove the pspace from the list, and deleting the pspace.

This patch eliminates delete_program_space, and makes the pspace dtor
remove the deleted pspace from the pspace list itself, i.e., makes the
dtor do the mirror opposite of the ctor.

I found this helps with a following patch that will allocate a mock
program_space on the stack.  It's easier to just let the regular dtor
remove the mock pspace from the pspace list than arrange to call
delete_program_space instead of the pspace dtor in that situation.

While at it, move the ctor/dtor intro comments to the header file, and
make the ctor explicit.

gdb/ChangeLog:
2020-04-16  Pedro Alves  <palves@redhat.com>

* inferior.c (delete_inferior): Use delete operator directly
instead of delete_program_space.
* progspace.c (add_program_space): New, factored out from
program_space::program_space.
(remove_program_space): New, factored out from
delete_program_space.
(program_space::program_space): Remove intro comment.  Rewrite.
(program_space::~program_space): Remove intro comment.  Call
remove_program_space.
(delete_program_space): Delete.
* progspace.h (program_space::program_space): Make explicit.  Move
intro comment here, adjusted.
(program_space::~program_space): Move intro comment here,
adjusted.
(delete_program_space): Remove.

Fix Cygwin gdb build

Simon pointed out that the windows-nat sharing series broke the Cygwin
build.  This patch fixes the problem, by moving the Cygwin-specific
code to a new handler function.  This approach is taken because this
code calls find_pc_partial_function, which isn't available in
gdbserver.

gdb/ChangeLog
2020-04-16  Tom Tromey  <tromey@adacore.com>

* windows-nat.c (windows_nat::handle_access_violation): New
function.
* nat/windows-nat.h (handle_access_violation): Declare.
* nat/windows-nat.c (handle_exception): Move Cygwin code to
windows-nat.c.  Call handle_access_violation.

gdbserver/ChangeLog
2020-04-16  Tom Tromey  <tromey@adacore.com>

* win32-low.cc (windows_nat::handle_access_violation): New
function.

[gdb/symtab] Handle PU without import in "save gdb-index"

Consider the test-case added in this patch, with resulting dwarf:
...
  Compilation Unit @ offset 0xc7:
   Length:        0x2c (32-bit)
   Version:       4
   Abbrev Offset: 0x64
   Pointer Size:  8
 <0><d2>: Abbrev Number: 2 (DW_TAG_partial_unit)
    <d3>   DW_AT_language    : 2        (non-ANSI C)
    <d4>   DW_AT_name        : imported_unit.c
 <1><e4>: Abbrev Number: 3 (DW_TAG_base_type)
    <e5>   DW_AT_byte_size   : 4
    <e6>   DW_AT_encoding    : 5        (signed)
    <e7>   DW_AT_name        : int
 <1><eb>: Abbrev Number: 4 (DW_TAG_subprogram)
    <ec>   DW_AT_name        : main
    <f1>   DW_AT_type        : <0xe4>
    <f5>   DW_AT_external    : 1
 <1><f6>: Abbrev Number: 0
  Compilation Unit @ offset 0xf7:
   Length:        0x2c (32-bit)
   Version:       4
   Abbrev Offset: 0x85
   Pointer Size:  8
 <0><102>: Abbrev Number: 2 (DW_TAG_compile_unit)
    <103>   DW_AT_language    : 2       (non-ANSI C)
    <104>   DW_AT_name        : <artificial>
 <1><111>: Abbrev Number: 3 (DW_TAG_subprogram)
    <112>   DW_AT_abstract_origin: <0xeb>
    <116>   DW_AT_low_pc      : 0x4004a7
    <11e>   DW_AT_high_pc     : 0x4004b2
 <1><126>: Abbrev Number: 0
...

When run with target board cc-with-gdb-index, we run into:
...
(gdb) break main
warning: (Internal error: pc 0x4004a7 in read in CU, but not in symtab.)
<repeat>
warning: (Internal error: pc 0x4004ab in read in CU, but not in symtab.)
<repeat>
Breakpoint 1 at 0x4004ab
(gdb) PASS: gdb.dwarf2/imported-unit-runto-main.exp: setting breakpoint at main
run
Starting program: /data/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.dwarf2/imported-unit-runto-main/imported-unit-runto-main
warning: (Internal error: pc 0x4004a7 in read in CU, but not in symtab.)
<repeat>
warning: (Internal error: pc 0x4004ab in read in CU, but not in symtab.)
<repeat>

Breakpoint 1, warning: (Internal error: pc 0x4004ab in read in CU, but not in symtab.)
warning: (Internal error: pc 0x4004ab in read in CU, but not in symtab.)
<repeat>
0x00000000004004ab in main ()
warning: (Internal error: pc 0x4004ab in read in CU, but not in symtab.)
<repeat>
(gdb) FAIL: gdb.dwarf2/imported-unit-runto-main.exp: running to main in runto
...

Looking at the .gdb_index section contents using objdump --dwarf=gdb_index, we
have:
...
CU table:
[  0] 0x0 - 0x2d
[  1] 0x2e - 0xa4
[  2] 0xa5 - 0xc6
[  3] 0xf7 - 0x126
[  4] 0x127 - 0x2de
[  5] 0x2df - 0x300

Address table:
00000000004004a7 00000000004004b2 4

Symbol table:
[489] main: 4 [global, function]
...
We see that both the main symbol, and main address range map to CU 4, which has
offset range 0x127 - 0x2de, while main actually is contained in CU 3 at offset
range 0xf7 - 0x126.

This is caused by this continue in write_gdbindex, which triggers for the PU:
...
      /* CU of a shared file from 'dwz -m' may be unused by this main file.
        It may be referenced from a local scope but in such case it does not
        need to be present in .gdb_index.  */
      if (psymtab == NULL)
       continue;
...
The continue causes the PU to be skipped in the CU table (we can see that the
PU offset range 0xc7-0xf6 is missing) but the references are not taking that
into account.

I've tried fixing this in the optimal way, by updating the references, but ran
into trouble when follow_die_offset tries to find the CU for the inter-CU
ref.  Because the PU is missing from the CU table,
dwarf2_find_containing_comp_unit bisects to the wrong CU.

Fix this by not skipping the PU in the CU table.

Build and reg-tested on x86_64-linux, with native and target boards
cc-with-gdb-index, cc-with-dwz and cc-with-dwz-m.

gdb/ChangeLog:

2020-04-16  Tom de Vries  <tdevries@suse.de>

PR symtab/25791
* dwarf2/index-write.c (write_gdbindex): Generate CU table entries for
CUs without psymtab.

gdb/testsuite/ChangeLog:

2020-04-16  Tom de Vries  <tdevries@suse.de>

PR symtab/25791
* gdb.dwarf2/gdb-add-index.exp (add_gdb_index): Move ...
(ensure_gdb_index): and factor out and move ...
* lib/gdb.exp (add_gdb_index, ensure_gdb_index): ... here.
* gdb.dwarf2/imported-unit-runto-main.exp: New file.

Fix compilation of python/python.c for Python 3.9

This commit fixes a compilation warning/error when building GDB
with Python 3.9:

g++ -x c++  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  -DDNF_DEBUGINFO_INSTALL   -I. -I../../gdb -I../../gdb/config -DLOCALEDIR="\"/usr/share/locale\"" -DHAVE_CONFIG_H -I../../gdb/../include/opcode   -I../bfd -I../../gdb/../bfd -I../../gdb/../include -I../libdecnumber -I../../gdb/../libdecnumber  -I../../gdb/../gnulib/import -I../gnulib/import  -DTUI=1    -I/usr/include/guile/2.0 -pthread  -I/usr/include/python3.9 -I/usr/include/python3.9  -I../../gdb/.. -pthread -Wall -Wpointer-arith -Wno-unused -Wunused-value -Wunused-variable -Wunused-function -Wno-switch -Wno-char-subscripts -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable -Wno-sign-compare -Wno-error=maybe-uninitialized -Wno-mismatched-tags -Wsuggest-override -Wimplicit-fallthrough=3 -Wduplicated-cond -Wshadow=local -Wdeprecated-copy -Wdeprecated-copy-dtor -Wredundant-move -Wformat -Wformat-nonliteral -Wno-unused -Werror -c -o ser-tcp.o -MT ser-tcp.o -MMD -MP -MF ./.deps/ser-tcp.Tpo ../../gdb/ser-tcp.c
../../gdb/python/python.c: In function 'bool do_start_initialization()':
../../gdb/python/python.c:1621:23: error: 'void PyEval_InitThreads()' is deprecated [-Werror=deprecated-declarations]
 1621 |   PyEval_InitThreads ();
      |                       ^
In file included from /usr/include/python3.9/Python.h:141,
                 from ../../gdb/python/python-internal.h:86,
                 from ../../gdb/python/python.c:92:
/usr/include/python3.9/ceval.h:132:37: note: declared here
  132 | Py_DEPRECATED(3.9) PyAPI_FUNC(void) PyEval_InitThreads(void);
      |                                     ^~~~~~~~~~~~~~~~~~

Information about the deprecated function can be found here:

https://docs.python.org/3.9/whatsnew/3.9.html#deprecated

Specifically, with regard to PyEval_InitThreads(), it says:

    The PyEval_InitThreads() and PyEval_ThreadsInitialized() functions
    are now deprecated and will be removed in Python 3.11.  Calling
    PyEval_InitThreads() now does nothing.  The GIL is initialized by
    Py_Initialize() since Python 3.7.  (Contributed by Victor Stinner
    in bpo-39877.)

I chose to disable the call with a #if test using PY_VERSION_HEX.
There is precedent for use of PY_VERSION_HEX; it's used in two places
in python-internal.h.  I noticed that under certain circumstances
python-internal.h defines PyEval_InitThreads to be nothing, which
accomplishes the same thing.  I considered doing something similar for
this case, but decided against it because, at some point in the future,
the presence of PyEval_InitThreads() without some explanation will be
confusing to a reader who won't be able to find PyEval_InitThreads in
the current (future for us) Python API.  IMO, use of the #if along
with an accompanying comment seemed more straightforward.

gdb/ChangeLog:

* python/python.c (do_start_initialization): Don't call
PyEval_InitThreads for Python 3.9 and beyond.

Change-Id: I0679fc10b6b76761a99538568f13188c6d8014e0

PR25827, Null pointer dereferencing in scan_unit_for_symbols

PR 25827
* dwarf2.c (scan_unit_for_symbols): Wrap overlong lines.  Don't
strdup(0).

cpu,gas,opcodes: support for eBPF JMP32 instruction class

Add support for the JMP32 class of eBPF instructions.

cpu/ChangeLog

* bpf.cpu (define-cond-jump-insn): Renamed from djci.
(dcji) New version with support for JMP32

gas/ChangeLog

* testsuite/gas/bpf/bpf.exp: Run jump32 tests.
* testsuite/gas/bpf/jump32.s: New file.
* testsuite/gas/bpf/jump32.d: Likewise.

opcodes/ChangeLog

* bpf-desc.c: Regenerate.
* bpf-desc.h: Likewise.
* bpf-opc.c: Regenerate.
* bpf-opc.h: Likewise.

[gdb/testsuite] Fix maint-expand-symbols-header-file.exp for cc-with-gdb-index

With test-case gdb.base/maint-expand-symbols-header-file.exp and target board
cc-with-gdb-index, we have:
...
FAIL: gdb.base/maint-expand-symbols-header-file.exp: \
  verify no symtabs are expanded
...

By default, with partial symbols, we find the main function in the partial
symbols, and derive the initial language setting from that, without expanding
any psymtab.

But that doesn't work with the indices, because the indices don't store the
language with the symbols.  So instead, the main psymtab is expanded to get
the language of main, which causes the FAIL.

Fix this by manually setting the language.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-04-16  Tom de Vries  <tdevries@suse.de>

* gdb.base/maint-expand-symbols-header-file.exp: Set language before
loading exec.

PowerPC64 GOT reloc reserving PLT entry for ifunc

I can't see any reason why ELFv2 should create a PLT entry for ifuncs
referenced by GOT relocs as long as the GOT entry remains.  The GOT
entry ought to be resolved by ld.so to the value returned by the ifunc
resolver, or if there is global entry stub created for some other
reason, by the linker to the stub address.

* elf64-ppc.c (ppc64_elf_check_relocs): Don't create plt entries
for GOT relocs against ifuncs.

PowerPC64 GOT reloc optimisation

When the symbol referenced by a GOT reloc is an ifunc, we can't
optimise away the GOT indirection.  Well, we can, but only if a global
entry stub is created with the ifunc symbol redefined to the stub.
But that results in slower code and an indirection via the PLT so
there isn't much to like about that solution.

* elf64-ppc.c (ppc64_elf_edit_toc): Exclude ifunc from GOT
optimisation.
(ppc64_elf_relocate_section): Likewise.

Extend objdump --no-addresses info

* doc/binutils.texi: Mention --no-show-raw-insn in objdump
--no-addresses description.

gdbserver: fix format string warning in win32-low.cc

When compiling on Cygwin, we get:

      CXX    win32-low.o
    /home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc: In function ‘int get_child_debug_event(DWORD*, target_waitstatus*)’:
    /home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:1459:17: error: format ‘%x’ expects argument of type ‘unsigned int’, but argument 2 has type ‘long int’ [-Werror=format=]
     1459 |       OUTMSG2 (("get_windows_debug_event - "
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
     1460 |   "unexpected stop in 0x%x (expecting 0x%x)\n",
          |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     1461 |   ptid.lwp (), desired_stop_thread_id));
          |   ~~~~~~~~~~~
          |            |
          |            long int
    /home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:52:11: note: in definition of macro ‘OUTMSG2’
       52 |    printf X;    \
          |           ^
    /home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:1460:26: note: format string is defined here
     1460 |   "unexpected stop in 0x%x (expecting 0x%x)\n",
          |                         ~^
          |                          |
          |                          unsigned int
          |                         %lx

`ptid.lwp ()` is a `long` value, so it indeed needs the `l` size modifier.

gdbserver/ChangeLog:

* win32-low.cc (get_child_debug_event): Fix format string warning.

Automatic date update in version.in

Fix OpenBSD build error.

This was likely introduced by 5b6d1e4fa4fc6827c7b3f0e99ff120dfa14d65d2

gdb/ChangeLog:

2020-04-15  Kamil Rytarowski  <n54@gmx.com>

* obsd-nat.c (obsd_nat_target::update_thread_list): Pass "this" to
thread functions.
(obsd_nat_target::wait): Likewise.

Change-Id: Ib8d11238c55e0ebdbcf127d1f28c9693c785527a

Use debug_printf in windows-nat.c

While debugging a bug on Windows, I noticed that windows-nat.c is not
sending its debugging output to gdb_stdlog.  This is unfortunate
because it means that "set logging debugredirect" doesn't work
properly.

This patch fixes the problem by changing windows-nat.c to use
debug_printf.

Note that get_windows_debug_event also writes one debugging message
unconditionally.  It isn't clear to me if this really ought to use
DEBUG_EVENTS or not, since it seems like perhaps it is intended to
note an unexpected event occurring.  So, I didn't change this.

I'm checking this in.

gdb/ChangeLog
2020-04-15  Tom Tromey  <tromey@adacore.com>

* windows-nat.c (DEBUG_EXEC, DEBUG_EVENTS, DEBUG_MEM)
(DEBUG_EXCEPT): Use debug_printf.

gdb: Don't corrupt completions hash when expanding the hash table

Commit:

  commit 724fd9ba432a20ef2e3f2c0d6060bff131226816
  Date:   Mon Jan 27 17:37:20 2020 +0000

      gdb: Restructure the completion_tracker class

caused the completion hash table to become corrupted if the table ever
needed to grow beyond its original size of 200 elements.

The hash table stores completion_tracker::completion_hash_entry
objects, but hashes them based on their name, which is only one field
of the object.

When possibly inserting a new element we compute the hash with
htab_hash_string of the new elements name, and then lookup matching
elements using htab_find_slot_with_hash.  If there's not matching
element we create a completion_hash_entry object within the hash
table.

However, when we allocate the hash we pass htab_hash_string to
htab_create_alloc as the hash function, and this is not OK.  This
means that when the hash table needs to grow, existing elements within
the hash are re-hashed by passing the completion_hash_entry pointer to
htab_hash_string, which obviously does not do what we expect.

The solution is to create a new hash function that takes a pointer to
a completion_hash_entry, and then calls htab_hash_string on the name
of the entry only.

This regression was spotted when running the gdb.base/completion.exp
test on the aarch64 target.

gdb/ChangeLog:

* completer.c (class completion_tracker::completion_hash_entry)
<hash_name>: New member function.
(completion_tracker::discard_completions): New callback to hash a
completion_hash_entry, pass this to htab_create_alloc.

gdb/testsuite/ChangeLog:

* gdb.base/many-completions.exp: New file.

Better handling of realpath() failure in windows_make_so() on Cygwin

It seems Cygwin's realpath() can fail on certain DLLs (apparently some
AV software prevent it working on it's DLLs; See [1], [2]).  Warn rather
than stopping with an error if that occurs.

Based on an original patch from Tim Chick.

[1] https://cygwin.com/ml/cygwin/2014-08/msg00401.html
[2] https://cygwin.com/ml/cygwin/2015-11/msg00353.html

gdb/ChangeLog:

2016-01-20  Jon Turney  <jon.turney@dronecode.org.uk>

* windows-nat.c (windows_make_so): Warn rather than stopping with
an error if realpath() fails.

Unify the behaviour of ld.bfd and ld.gold with respect to warning about unresolved symbol references.  (PR 24613)

PR binutils/24613
include * bfdlink.h (enum report_method): Delete RM_GENERATE_WARNING and
RM_GENERATE_ERROR. Add RM_DIAGNOSE.
(struct bfd_link_info): Add warn_unresolved_syms.

ld * lexsup.c (parse_args): Change RM_GENERATE_WARNING and
RM_GENERATE_ERROR to RM_DIAGNOSE.
* emultempl/aix.em (ld_${EMULATION_NAME}_emulation): Change
RM_GENERATE_ERROR to RM_DIAGNOSE.
* emultempl/elf.em (ld_${EMULATION_NAME}_emulation): Likewise.

bfd * coff-rs6000.c (xcoff_ppc_relocate_section): Change RM_GENERATE_ERROR
to RM_DIAGNOSE plus a check of warn_unresolved_syms.
* coff64-rs6000.c (xcoff_ppc_relocate_section): Likewise.
* elf-bfd.h (_bfd_elf_large_com_section): Likewise.
* elf32-m32r.c (m32r_elf_relocate_section): Likewise.
* elf32-score.c (s3_bfd_score_elf_relocate_section): Likewise.
* elf32-score7.c (s7_bfd_score_elf_relocate_section): Likewise.
* elf32-sh.c (sh_elf_relocate_section): Likewise.
* elf32-spu.c (spu_elf_relocate_section): Likewise.
* elf64-hppa.c (elf64_hppa_relocate_section): Likewise.
* elflink.c (elf_link_output_extsym): Likewise.
* elfxx-mips.c (mips_elf_calculate_relocation): Likewise.

objdump --no-addresses

I find this useful when needing to compare compiler output, where the
address of the instruction and the value of symbols results in
unwanted differences.

* objdump.c (no_addresses): New static var.
(usage): Print help for --no-addresses.
(long_options): Add --no-addresses entry.
(objdump_print_addr_with_sym, objdump_print_addr): Omit symbol address.
(disassemble_bytes): Don't print current line address, or reloc
address.
* doc/binutils.texi: Document objdump --no-addresses.

PR25823, Use after free in bfd_hash_lookup

PR 25823
* peXXigen.c (_bfd_XXi_swap_sym_in <C_SECTION>): Don't use a
pointer into strings that may be freed for section name, always
allocate a new string.

Fix makeinfo warnings in gdb.texinfo and python.texi docs

Building gdb-9.1 on a system that has an older version of makeinfo
(4.8) shows the following warnings:

-----------------
make[4]: Entering directory '/home/tester/gdb-9.1/build/gdb/doc'
makeinfo --split-size=5000000 --split-size=5000000   -I
../../../gdb/doc/../../readline/readline/doc -I ../../../gdb/doc/../mi
-I ../../../gdb/doc \
    -o gdb.info ../../../gdb/doc/gdb.texinfo
../../../gdb/doc/gdb.texinfo:21867: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21867: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21868: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21868: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21869: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21869: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21872: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21872: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21874: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21874: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21876: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21876: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21879: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21879: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21931: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21931: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21933: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21933: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21936: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21936: warning: unlikely character ] in @var.
../../../gdb/doc/gdb.texinfo:21939: warning: unlikely character [ in @var.
../../../gdb/doc/gdb.texinfo:21939: warning: unlikely character ] in @var.
../../../gdb/doc//python.texi:3297: warning: `.' or `,' must follow
@xref, not `A'.
make[4]: Leaving directory '/home/tester/gdb-9.1/build/gdb/doc'
-----------------

These are thrown by expressions like `@var{[host]}`, intended to
produce `[HOST]`.

In that context this should instead be changed to `[@var{host}]`, which
has the same effect but without the warnings.

As for the warning in `python.texi`, there's period missing at the end
of one `@xref{}` clause.  Added.

gdb/doc/ChangeLog:

2020-04-15  Artur Shepilko  <nomadbyte@gmail.com>

* gdb.texinfo: Transform @var{[host]} to [@var{host}]; this
clears makeinfo warnings.
* python.texi: Add a missing period trailing an @xref{} clause;
this clears a makeinfo warning.

PR25822, Invalid read in process_symbol_table

PR 25822
* readelf.c (get_num_dynamic_syms): Don't set num_of_syms when
reading buckets or chains fails.

readelf: zero static vars after freeing

When readelf is processing more than one file, static bss vars won't
start out as zero for the second file unless they are cleared.

* readelf.c (process_symbol_table): Zero gnubuckets, gnuchains
etc. after freeing.

readelf: increase size of static buffers

Translated strings might be larger than the original.

* readelf.c (get_group_flags): Translate text.
(get_file_type, get_symbol_binding, get_symbol_type),
(get_ppc64_symbol_other, get_symbol_other): Increase size of buffer.

Re: readelf: Consolidate --syms --use-dynamic with --dyn-syms

PR 25821
* readelf.c (get_num_dynamic_syms): Typo fix.

Automatic date update in version.in

[PATCH v2 2/2] coff-go32: support extended relocations

This patch extends the relocation and line number counters for
coff-go32 and coff-go32-exe to 32 bits.  As I understand it works the
same as for PE-COFF:

If the number of relocations in an object file exceeds 65534, the
NRELOC field is set to 65535 and the actual number of relocations is
stored in the VADDR field of the first relocation entry.

Executable files have no relocations, and thus the NRELOC field is
repurposed to extend NLNNO to 32-bits.

bfd * coff-go32.c (COFF_GO32, IMAGE_SCN_LNK_NRELOC_OVFL)
(coff_SWAP_scnhdr_in, coff_SWAP_scnhdr_out): Define.
(_bfd_go32_swap_scnhdr_in, _bfd_go32_swap_scnhdr_out)
(_bfd_go32_mkobject): New functions.
* coff-stgo32.c (IMAGE_SCN_LNK_NRELOC_OVFL)
(coff_SWAP_scnhdr_in, coff_SWAP_scnhdr_out): Define.
(go32exe_mkobject): Call _bfd_go32_mkobject.
* coffcode.h (COFF_WITH_EXTENDED_RELOC_COUNTER): Define.
(coff_set_alignment_hook): Define function for COFF_GO32_EXE
and COFF_GO32.
(coff_write_relocs): Enable extended reloc counter code if
COFF_WITH_EXTENDED_RELOC_COUNTER is defined.  Test for obj_go32.
(coff_write_object_contents): Likewise.  Pad section headers
for COFF_GO32 and COFF_GO32EXE.  Use bfd_coff_swap_scnhdr_out
instead of coff_swap_scnhdr_out.
* cofflink.c (_bfd_coff_final_link): Test also for obj_go32 to
enable extended reloc counter.
* coffswap.h: (coff_swap_scnhdr_in, coff_swap_scnhdr_out):
Declare with ATTRIBUTE_UNUSED.
* libcoff-in.h: (struct coff_tdata): New field go32.
(obj_go32): Define.
* libcoff.h: Regenerate.

Implement IP_STAT+IP_STATUS (aliases of the same format) on NetBSD

Output based on FreeBSD with the following changes:
 - "utime+stime, children" merged from "utime, children" and
   "stime, children".
 - "Minor faults, children", "Major faults, children",
   "Virtual memory size" removed as not available in a direct
   equivalent.

No new values missing or skipped in FreeBSD are printed, although
there is a long list of potential candiates.

gdb/ChangeLog:

        * nbsd-nat.c (nbsd_pid_to_kinfo_proc2): New.
        (nbsd_nat_target::info_proc): Add do_status.

The assembler only supports 32-bit stabs. So set sh_entsize unconditionally to 12.

PR gas/25768
* elf.c (assign_section_numbers): Always set .stab sh_entsize to
12.

readelf memory leaks processing mips

* readelf.c (process_mips_specific): Free eopt and iopt.  Avoid
possibility of overflow when checking number of conflicts.

Fixes for the magic number used in PDP11 AOUT binaries.

PR ld/25677
include * aout/aout64.h (N_DATADDR): Add IMAGIC case.

bfd * pdp11.c: Add implementation of --imagic option.
(adjust_o_magic): Fix objcopy --extract-symbol test.
* libaout.h (enum aout_magic): Add i_magic.

ld * emulparams/pdp11.sh (SCRIPT_NAME): Change to pdp11.
(EXTRA_EM_FILE): New, add emulation file pdp11.
* scripttempl/pdp11.sc: New, derived from aout.sc without
irrelevant input sections.
* emultempl/pdp11.em (_add_options, _handle_option)
(_list_options): New. Add options -z, --imagic for pdp11-aout.
(_before_parse): Make --omagic be default instead of --nmagic.
(_get_script): Modify special-case linker script for --imagic.
* lexsup.c (parse_args): Explictly set config.text_read_only for -n.
* ld.texi (Options): Add documentation of PDP11-specific options.
(Options): Fix unrelated typo to --no-compact-branches.
* gen-doc.texi: @set PDP11.
* testsuite/ld-pdp11/pdp11.exp: New, start pdp11 testing.
* testsuite/ld-pdp11/sections.s: New, source for options tests.
* testsuite/ld-pdp11/imagic.d: New, test --imagic format.
* testsuite/ld-pdp11/imagicz.d: New, test -z (imagic) format.
* testsuite/ld-pdp11/nmagic.d: New, test --nmagic format.
* testsuite/ld-pdp11/omagic.d: New, test --omagic format.

[gdb] Fix missing symtab includes

[ The test-case requires commit c1a66c0629 "[gdb] Expand symbolless symtabs
using maint expand-symtabs". ]

Consider the debug info for the test-case included in this patch.  It consists
of a PU:
...
 <0><d2>: Abbrev Number: 2 (DW_TAG_partial_unit)
 <1><d3>: Abbrev Number: 0
...
imported by a CU:
...
 <0><df>: Abbrev Number: 2 (DW_TAG_compile_unit)
    <e0>   DW_AT_language    : 2        (non-ANSI C)
    <e1>   DW_AT_stmt_list   : 0xe9
 <1><e5>: Abbrev Number: 3 (DW_TAG_imported_unit)
    <e6>   DW_AT_import      : <0xd2>   [Abbrev Number: 2]
 <1><ea>: Abbrev Number: 0
...
and the CU has a dw2-symtab-includes.h file in the .debug_line file name
table:
...
 The Directory Table (offset 0x101):
  1     /data/gdb_versions/devel/src/gdb/testsuite/gdb.dwarf2

 The File Name Table (offset 0x138):
  Entry Dir     Time    Size    Name
  1     1       0       0       dw2-symtab-includes.h
...

After expanding all symtabs, we can see the CU listed in the user field of the
PU, and vice-versa the PU listed in the includes of the CU:
...
$ gdb.sh -batch \
  -iex "set language c" \
  outputs/gdb.dwarf2/dw2-symtab-includes/dw2-symtab-includes \
  -ex "maint expand-symtabs" \
  -ex "maint info symtabs"
  ...
  { ((struct compunit_symtab *) 0x394dd60)
    debugformat DWARF 2
    producer (null)
    dirname (null)
    blockvector ((struct blockvector *) 0x394dea0)
    user ((struct compunit_symtab *) 0x394dba0)
  }
  { ((struct compunit_symtab *) 0x394dba0)
    debugformat DWARF 2
    producer (null)
    dirname (null)
    blockvector ((struct blockvector *) 0x394dd10)
    user ((struct compunit_symtab *) (null))
    ( includes
      ((struct compunit_symtab *) 0x394dd60)
    )
  }
...

But if we instead only expand the symtab for the dw2-symtab-includes.h file,
the includes and user links are gone:
...
$ gdb -batch \
  -iex "set language c" \
  outputs/gdb.dwarf2/dw2-symtab-includes/dw2-symtab-includes \
  -ex "maint expand-symtabs dw2-symtab-includes.h" \
  -ex "maint info symtabs"
  ...
  { ((struct compunit_symtab *) 0x2728210)
    debugformat DWARF 2
    producer (null)
    dirname (null)
    blockvector ((struct blockvector *) 0x2728350)
    user ((struct compunit_symtab *) (null))
  }
  { ((struct compunit_symtab *) 0x2728050)
    debugformat DWARF 2
    producer (null)
    dirname (null)
    blockvector ((struct blockvector *) 0x27281c0)
    user ((struct compunit_symtab *) (null))
  }
...

The includes are calculated by process_cu_includes in gdb/dwarf2/read.c.

In the case of expanding all symtabs:
- the CU partial symtab is expanded using psymtab_to_symtab
- psymtab_to_symtab calls dwarf2_psymtab::read_symtab
- dwarf2_psymtab::read_symtab calls dwarf2_psymtab::expand_psymtab
- dwarf2_psymtab::read_symtab calls process_cu_includes, and we have the
  includes

In the case of expanding the symtab for dw2-symtab-includes.h:
- the dw2-symtab-includes.h partial symtab is expanded using psymtab_to_symtab
- psymtab_to_symtab calls dwarf2_include_psymtab::read_symtab
- dwarf2_include_psymtab::read_symtab calls
  dwarf2_include_psymtab::expand_psymtab
- dwarf2_include_psymtab::expand_psymtab calls
  partial_symtab::expand_dependencies
- partial_symtab::expand_dependencies calls dwarf2_psymtab::expand_psymtab
  for the CU partial symtab
- the CU partial symtab is expanded using dwarf2_psymtab::expand_psymtab
- process_cu_includes is never called

Fix this by making sure in dwarf2_include_psymtab::read_symtab that
read_symtab is called for the CU partial symtab.

Tested on x86_64-linux, with native, and target board cc-with-dwz and
cc-with-dwz-m.

In addition, tested test-case with target boards cc-with-gdb-index.exp,
cc-with-debug-names.exp and readnow.exp.

gdb/ChangeLog:

2020-04-14  Simon Marchi  <simon.marchi@polymtl.ca>
    Tom de Vries  <tdevries@suse.de>

PR symtab/25718
* psympriv.h (struct partial_symtab::read_symtab)
(struct partial_symtab::expand_psymtab)
(struct partial_symtab::read_dependencies): Update comments.
* dwarf2/read.c (struct dwarf2_include_psymtab::read_symtab): Call
read_symtab for includer.
(struct dwarf2_include_psymtab::expand_psymtab): Assert false.
(struct dwarf2_include_psymtab::readin_p): Call readin_p () for includer.
(struct dwarf2_include_psymtab::m_readin): Remove.
(struct dwarf2_include_psymtab::includer): New member function.
(dwarf2_psymtab::expand_psymtab): Assert !readin.

gdb/testsuite/ChangeLog:

2020-04-14  Tom de Vries  <tdevries@suse.de>

PR symtab/25718
* gdb.dwarf2/dw2-symtab-includes.exp: New file.

[gdb] Expand symbolless symtabs using maint expand-symtabs

Consider this test-case, consisting of header file hello.h:
...
inline static const char*
foo (void)
{
  return "foo";
}
...
and source file hello.c:
...
int
main (void)
{
  printf ("hello: %s\n", foo ());
  return 0;
}
...
compiled with -g:
...
$ gcc hello.c -g
...

When trying to expand the partial symtab for hello.h:
...
$ gdb -batch \
  -iex "set language c" \
  a.out \
  -ex "maint expand-symtabs hello.h" \
  -ex "maint info psymtabs"
...
we in fact find that the partial symtab for hello.h (and corresponding
includer partial symtab hello.c) have not been expanded:
...
  { psymtab hello.h ((struct partial_symtab *) 0x27cf070)
    readin no
  ...
  { psymtab hello.c ((struct partial_symtab *) 0x2cf09e0)
    readin no
...

This is due to the recursively_search_psymtabs call in
psym_expand_symtabs_matching:
...
      if (recursively_search_psymtabs (ps, objfile, domain,
                                      lookup_name, symbol_matcher))
...
which always returns false for symbolless partial symtabs.

The same problem occurs with CUs where the dwarf is generated by gas
--gdwarf-2 for a foo.S: if we read such a test-case with -readnow, we'll have
a symbolless symtab for foo.S.  But if we read the test-case with partial
symtabs, and expand those using "maint expand-symtabs", the foo.S psymtab
remains unexpanded.

Fix this by passing a NULL symbol_matcher and lookup_name to
expand_symtabs_matching in maintenance_expand_symtabs, and skipping the call
to recursively_search_psymtabs if symbol_matcher == NULL and
lookup_name == NULL.

Build and tested on x86_64-linux, with native.

In addition, tested test-case with target boards cc-with-gdb-index.exp,
cc-with-debug-names.exp and readnow.exp.

gdb/ChangeLog:

2020-04-14  Tom de Vries  <tdevries@suse.de>

PR symtab/25720
* symmisc.c (maintenance_expand_symtabs): Call expand_symtabs_matching
with NULL symbol_matcher and lookup_name.
* psymtab.c (psym_expand_symtabs_matching): Handle NULL symbol_matcher
and lookup_name.
* dwarf2/read.c (dw2_expand_symtabs_matching)
(dw2_debug_names_expand_symtabs_matching): Same.
* symfile.h (struct quick_symbol_functions::expand_symtabs_matching):
Make lookup_name a pointer.  Update comment.
* symtab.c (global_symbol_searcher::expand_symtabs): Handle
lookup_name being a pointer.
* symfile.c (expand_symtabs_matching): Same.
* symfile-debug.c (debug_qf_expand_symtabs_matching): Same.
* linespec.c (iterate_over_all_matching_symtabs): Same.

gdb/testsuite/ChangeLog:

2020-04-14  Tom de Vries  <tdevries@suse.de>

PR symtab/25720
* gdb.base/maint-expand-symbols-header-file.c: New test.
* gdb.base/maint-expand-symbols-header-file.exp: New file.
* gdb.base/maint-expand-symbols-header-file.h: New test.

readelf: Consolidate --syms --use-dynamic with --dyn-syms

When reconstructing dynamic symbol table from the PT_DYNAMIC segment,
compute dynamic symbol table size from hash table.  For DT_HASH, the
number of dynamic symbol table entries equals the number of chains.
For DT_GNU_HASH/DT_MIPS_XHASH, only defined symbols with non-STB_LOCAL
indings are in hash table.  Since DT_GNU_HASH/DT_MIPS_XHASH place all
symbols with STB_LOCAL binding before symbols with other bindings and
all undefined symbols defined ones in dynamic symbol table, the highest
symbol index in DT_GNU_HASH/DT_MIPS_XHASH is the highest dynamic symbol
table index.

Rewrite print_dynamic_symbol to dump dynamic symbol table for --dyn-syms
and --syms --use-dynamic.

binutils/

PR binutils/25707
* readelf.c (nbuckets): New.
(nchains): Likewise.
(buckets): Likewise.
(chains): Likewise.
(ngnubuckets): Likewise.
(gnubuckets): Likewise.
(gnuchains): Likewise.
(mipsxlat): Likewise.
(ngnuchains): Likewise.
(gnusymidx): Likewise.
(VALID_SYMBOL_NAME): Likewise.
(VALID_DYNAMIC_NAME): Use it.
(get_dynamic_data): Moved before process_dynamic_section.
(get_num_dynamic_syms): New function.
(process_dynamic_section): Use DT_SYMTAB, DT_SYMENT, DT_HASH,
DT_GNU_HASH and DT_MIPS_XHASH to reconstruct dynamic symbol
table.  Use DT_STRTAB and DT_STRSZ to reconstruct dynamic string
table.
(get_symbol_index_type): Don't print "bad section index" when
there is no section header.
(print_dynamic_symbol): Rewrite.
(process_symbol_table): Call print_dynamic_symbol to dump dynamic
symbol table.

ld/

PR binutils/25707
* testsuite/ld-arm/armthumb-lib.sym: Updated.
* testsuite/ld-arm/farcall-mixed-app.sym: Likewise.
* testsuite/ld-arm/farcall-mixed-app2.sym: Likewise.
* testsuite/ld-arm/fdpic-main-m.sym: Likewise.
* testsuite/ld-arm/fdpic-main.sym: Likewise.
* testsuite/ld-arm/fdpic-shared-m.sym: Likewise.
* testsuite/ld-arm/fdpic-shared.sym: Likewise.
* testsuite/ld-arm/mixed-app.sym: Likewise.
* testsuite/ld-arm/mixed-lib.sym: Likewise.
* testsuite/ld-arm/preempt-app.sym: Likewise.
* testsuite/ld-elf/hash.d: Likewise.
* testsuite/ld-elf/pr13195.d: Likewise.
* testsuite/ld-elfvsb/hidden2.d: Likewise.
* testsuite/ld-mips-elf/hash2.d: Likewise.

gdb/testsuite: Move helper function into lib/dwarf.exp

Every time I write a test making use of the DWARF assembler I end up
copying in the function get_func_info.  Duplicating code is bad, so
lets put this function into lib/dwarf.exp and remove all of the
duplicates.

There should be no changes in the testsuite behaviour after this
commit.

gdb/testsuite/ChangeLog:

* gdb.dwarf2/dw2-inline-many-frames.exp (get_func_info): Delete.
* gdb.dwarf2/dw2-inline-small-func.exp: Pass options to
get_func_info.
(get_func_info): Delete.
* gdb.dwarf2/dw2-is-stmt-2.exp (get_func_info): Delete.
* gdb.dwarf2/dw2-is-stmt.exp (get_func_info): Delete.
* lib/dwarf.exp (get_func_info): New function.

Automatic date update in version.in

Remove gdb_fildes_t

gdb_fildes_t and pfildes are no longer used, so remove them.

gdbserver/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* server.h (gdb_fildes_t): Remove typedef.
* remote-utils.c (remote_desc, list_desc): Now int.
(INVALID_DESCRIPTOR): Remove.
(gdb_connected, remote_close)
(check_remote_input_interrupt_request): Update.
* utils.h (pfildes): Don't declare.
* utils.c (pfildes): Remove.

Move gdb_notifier comment

This moves the gdb_notifier comment a bit lower in event-loop.c, to
where it belongs; and removes an obsolete comment that Pedro pointed
out.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* event-loop.c: Move comment.  Remove obsolete  comment.

Switch gdbserver to gdbsupport event loop

This changes gdbserver to use the gdbserver event loop, removing the
ancient fork.

gdbserver/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* server.h (handle_serial_event, handle_target_event): Update.
* server.c: Don't call initialize_event_loop.
(keep_processing_events): New global.
(handle_serial_event): Return void.  Set keep_processing_events.
(handle_target_event): Return void.
(start_event_loop): Move from event-loop.c.  Rewrite.
* remote-utils.c (handle_accept_event): Return void.
(reset_readchar): Use delete_timer.
(process_remaining): Return void.
(reschedule): Use create_timer.
* event-loop.h: Remove.
* event-loop.cc: Remove.
* Makefile.in (OBS): Use gdbsupport/event-loop.o, not event-loop.o.

Implement event-loop glue for gdbserver

event-loop.c requires the client to provide some functions.  This
patch implements these functions for gdbserver.

gdbserver/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* server.c (invoke_async_signal_handlers)
(check_async_event_handlers, flush_streams, gdb_select): New
functions.

Move event-loop.[ch] to gdbsupport/

This moves event-loop.[ch] to gdbsupport/ and updates the uses in gdb.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* run-on-main-thread.c: Update include.
* unittests/main-thread-selftests.c: Update include.
* tui/tui-win.c: Update include.
* tui/tui-io.c: Update include.
* tui/tui-interp.c: Update include.
* tui/tui-hooks.c: Update include.
* top.h: Update include.
* top.c: Update include.
* ser-base.c: Update include.
* remote.c: Update include.
* remote-notif.c: Update include.
* remote-fileio.c: Update include.
* record-full.c: Update include.
* record-btrace.c: Update include.
* python/python.c: Update include.
* posix-hdep.c: Update include.
* mingw-hdep.c: Update include.
* mi/mi-main.c: Update include.
* mi/mi-interp.c: Update include.
* main.c: Update include.
* linux-nat.c: Update include.
* interps.c: Update include.
* infrun.c: Update include.
* inf-loop.c: Update include.
* event-top.c: Update include.
* event-loop.c: Move to ../gdbsupport/.
* event-loop.h: Move to ../gdbsupport/.
* async-event.h: Update include.
* Makefile.in (COMMON_SFILES, HFILES_NO_SRCDIR): Update.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* event-loop.h: Move from ../gdb/.
* event-loop.cc: Move from ../gdb/.

Introduce async-event.[ch]

This patch splits out some gdb-specific code from event-loop, into new
files async-event.[ch].  Strictly speaking this code could perhaps be
put into gdbsupport/, but because gdbserver does not currently use it,
it seemed better, for size reasons, to split it out.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* tui/tui-win.c: Include async-event.h.
* remote.c: Include async-event.h.
* remote-notif.c: Include async-event.h.
* record-full.c: Include async-event.h.
* record-btrace.c: Include async-event.h.
* infrun.c: Include async-event.h.
* event-top.c: Include async-event.h.
* event-loop.h: Move some declarations to async-event.h.
* event-loop.c: Don't include ser-event.h or top.h.  Move some
code to async-event.c.
* async-event.h: New file.
* async-event.c: New file.
* Makefile.in (COMMON_SFILES): Add async-event.c.
(HFILES_NO_SRCDIR): Add async-event.h.

Introduce and use flush_streams

Code in gdbsupport can't call gdb_flush, so this introduces a new
"flush_streams" function that must be supplied by the client.

Note that the similar gdb_flush_out_err exists, but it isn't defined
in quite the same way, so it wasn't clear to me whether the two could
be merged.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* utils.c (flush_streams): New function.
* event-loop.c (gdb_wait_for_event): Call flush_streams.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* errors.h (flush_streams): Declare.

Use warning in event-loop

Change event-loop.c to avoid printf_unfiltered in favor of warning.
warning is aleady available to code in gdbsupport/.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* event-loop.c (handle_file_event): Use warning, not
printf_unfiltered.

Include <chrono> in event-loop.c

Include <chrono> in event-loop.c, because it is used there.  Currently
it is included indirectly, but after the subsequent patches this will
no longer be the case.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* event-loop.c: Include <chrono>.

Move gdb_select.h to gdbsupport/

This moves gdb_select.h to gdbsupport/, so it can be used by other
code there.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* gdb_select.h: Move to ../gdbsupport/.
* event-loop.c: Update include path.
* top.c: Update include path.
* ser-base.c: Update include path.
* ui-file.c: Update include path.
* ser-tcp.c: Update include path.
* guile/scm-ports.c: Update include path.
* posix-hdep.c: Update include path.
* ser-unix.c: Update include path.
* gdb_usleep.c: Update include path.
* mingw-hdep.c: Update include path.
* inflow.c: Update include path.
* infrun.c: Update include path.
* event-top.c: Update include path.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* gdb_select.h: Move from ../gdb/.

Move event-loop configury to common.m4

gdb_select.h and the event loop require some configure checks, so this
moves the needed checks to common.m4 and updates the configure
scripts.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* configure: Rebuild.
* configure.ac: Remove checks that are now in GDB_AC_COMMON.

gdbserver/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* configure: Rebuild.
* config.in: Rebuild.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* config.in, configure: Rebuild.
* common.m4 (GDB_AC_COMMON): Check for poll.h, sys/poll.h,
sys/select.h, and poll.

Move start_event_loop out of event-loop.c

A subsequent patch is going to move event-loop.c to gdbsupport.  In a
review of an earlier version of this series, Pedro pointed out that
the resulting code would be cleaner if start_event_loop were not
shared -- because gdb and gdbserver have some different needs here --
and so this moves start_event_loop to main.c.  Because the only caller
is there, it is also now static.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

* event-loop.h (start_event_loop): Don't declare.
* event-loop.c (start_event_loop): Move...
* main.c (start_event_loop): ...here.  Now static.