Commit Graph

1028 Commits

Author SHA1 Message Date
Antoine Tremblay c2c2a31fdb Remove support for thread events without PTRACE_EVENT_CLONE in GDB
Before, on systems that did not support PTRACE_EVENT_CLONE, both GDB and
GDBServer coordinated with libthread_db.so to insert breakpoints at magic
locations in libpthread.so, in order to break at thread creation and
thread death.

Support for thread events was removed from GDBServer as patch:
https://sourceware.org/ml/gdb-patches/2015-11/msg00466.html

This patch removes support for thread events in GDB.

No regressions found on Ubuntu 14.04 x86_64.

gdb/ChangeLog:

	* breakpoint.c (remove_thread_event_breakpoints): Remove.
	* breakpoint.h (remove_thread_event_breakpoints): Remove
	declaration.
	* linux-nat.c (in_pid_list_p): Remove.
	(lin_lwp_attach_lwp): Remove.
	* linux-nat.h (lin_lwp_attach_lwp): Remove declaration.
	* linux-thread-db.c (thread_db_use_events): Remove.
	(struct thread_db_info) <td_create_bp_addr>: Remove.
	<td_death_bp_addr>: Likewise.
	<td_ta_event_addr_p>: Likewise.
	<td_ta_set_event_p>: Likewise.
	<td_ta_clear_event_p>: Likewise.
	<td_ta_event_getmsg_p>: Likewise.
	<td_thr_event_enable_p>: Likewise.
	(attach_thread): Likewise.
	(detach_thread): Likewise.
	(have_threads_callback): Likewise.
	(have_threads): Likewise.
	(enable_thread_event): Likewise.
	(enable_thread_event_reporting): Likewise.
	(try_thread_db_load_1): Remove td_ta_event_addr, td_ta_set_event,
	td_ta_clear_event, td_ta_event_getmsg, td_thr_event_enable
	initializations.
	(try_thread_db_load_1): Remove enable_thread_event_reporting call.
	(disable_thread_event_reporting): Remove.
	(record_thread): Adapt to thread_db_use_event removal.
	(detach_thread): Remove.
	(thread_db_detach): Adapt to thread_db_use_event removal.
	(check_event): Remove.
	(thread_db_wait): Adapt to thread events support removal.
	(thread_db_mourn_inferior): Likewise.
	(find_new_threads_callback): Likewise.
	(find_new_threads_once): Likewise.
	(thread_db_update_thread_list): Likewise.
2015-12-10 10:46:29 -05:00
Simon Marchi c93e8391bf Fix internal error when saving fast tracepoint definitions
When trying to save fast tracepoints to file, gdb returns internal failure:

  gdb/breakpoint.c:13446: internal-error: unhandled tracepoint type 27
  A problem internal to GDB has been detected, further debugging may prove unreliable.

And no file including the fast tracepoints definition is created.

The patch also extends save-trace.exp to test saving tracepoint with a
fast tracepoint in there.  Note that because this test doesn't actually
inserts the tracepoints in the program, we can run it with targets that
don't actually support fast tracepoints (or tracepoints at all).

gdb/ChangeLog:

	* breakpoint.c (tracepoint_print_recreate): Fix logic error
	if -> else if.

gdb/testsuite/ChangeLog:

	* gdb.trace/actions.c: Include trace-common.h.
	(main): Add a location for a fast tracepoint.
	* gdb.trace/save-trace.exp: Set a fast tracepoint in addition to
	the normal tracepoints.
	(gdb_verify_tracepoints): Adjust number of expected tracepoints.
2015-11-23 18:47:09 -05:00
Pedro Alves c6d8112436 [C++] breakpoint.c: "no memory" software watchpoints and enum casts
Fixes:

 src/gdb/breakpoint.c: In function ‘void update_watchpoint(watchpoint*, int)’:
 src/gdb/breakpoint.c:2147:31: error: invalid conversion from ‘int’ to ‘target_hw_bp_type’ [-fpermissive]
     base->loc->watchpoint_type = -1;
				^

Seems better to rely on "address == -1 && length == -1" than on a enum
value that's not really part of the set of supposedly valid enum
values.  Also, factor that out to separate functions for better
localization of the concept.

gdb/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (software_watchpoint_add_no_memory_location)
	(is_no_memory_software_watchpoint): New functions.
	(update_watchpoint): Use
	software_watchpoint_add_memoryless_location.
	(breakpoint_address_bits): Use is_no_memory_software_watchpoint.
2015-11-19 14:32:53 +00:00
Pedro Alves d35ae83384 Don't displaced step when there's a breakpoint in the scratch pad range
Assuming displaced stepping is enabled, and a breakpoint is set in the
memory region of the scratch pad, things break.  One of two cases can
happen:

#1 - The breakpoint wasn't inserted yet (all threads were stopped), so
     after setting up the displaced stepping scratch pad with the
     adjusted copy of the instruction we're trying to single-step, we
     insert the breakpoint, which corrupts the scratch pad, and the
     inferior executes the wrong instruction.  (Example below.)
     This is clearly unacceptable.

#2 - The breakpoint was already inserted, so setting up the displaced
     stepping scratch pad overwrites the breakpoint.  This is OK in
     the sense that we already assume that no thread is going to
     executes the code in the scratch pad range (after initial
     startup) anyway.

This commit addresses both cases by simply punting on displaced
stepping if we have a breakpoint in the scratch pad range.

The #1 case above explains a few regressions exposed by the AS/NS
series on x86:

 Running ./gdb.dwarf2/callframecfa.exp ...
 FAIL: gdb.dwarf2/callframecfa.exp: set display for call-frame-cfa
 FAIL: gdb.dwarf2/callframecfa.exp: step 1 for call-frame-cfa
 FAIL: gdb.dwarf2/callframecfa.exp: step 2 for call-frame-cfa
 FAIL: gdb.dwarf2/callframecfa.exp: step 3 for call-frame-cfa
 FAIL: gdb.dwarf2/callframecfa.exp: step 4 for call-frame-cfa
 Running ./gdb.dwarf2/typeddwarf.exp ...
 FAIL: gdb.dwarf2/typeddwarf.exp: continue to breakpoint: continue to typeddwarf.c:53
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of x at typeddwarf.c:53
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of y at typeddwarf.c:53
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of z at typeddwarf.c:53
 FAIL: gdb.dwarf2/typeddwarf.exp: continue to breakpoint: continue to typeddwarf.c:73
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of w at typeddwarf.c:73
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of x at typeddwarf.c:73
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of y at typeddwarf.c:73
 FAIL: gdb.dwarf2/typeddwarf.exp: check value of z at typeddwarf.c:73

Enabling "maint set target-non-stop on" implies displaced stepping
enabled as well, and it's the latter that's to blame here.  We can see
the same failures with "maint set target-non-stop off + set displaced
on".

Diffing (good/bad) gdb.log for callframecfa.exp shows:

 @@ -99,29 +99,29 @@ Breakpoint 2 at 0x80481b0: file q.c, lin
  continue
  Continuing.

 -Breakpoint 2, func (arg=77) at q.c:2
 +Breakpoint 2, func (arg=52301) at q.c:2
  2      in q.c
  (gdb) PASS: gdb.dwarf2/callframecfa.exp: continue to breakpoint: continue to breakpoint for call-frame-cfa
  display arg
 -1: arg = 77
 -(gdb) PASS: gdb.dwarf2/callframecfa.exp: set display for call-frame-cfa
 +1: arg = 52301
 +(gdb) FAIL: gdb.dwarf2/callframecfa.exp: set display for call-frame-cfa

The problem is here, when setting up the func call:

 Breakpoint 1, main (argc=-13345, argv=0x0) at q.c:7
 7       in q.c

 (gdb) disassemble
 Dump of assembler code for function main:
    0x080481bb <+0>:     push   %ebp
    0x080481bc <+1>:     mov    %esp,%ebp
    0x080481be <+3>:     sub    $0x4,%esp
 => 0x080481c1 <+6>:     movl   $0x4d,(%esp)
    0x080481c8 <+13>:    call   0x80481b0 <func>
    0x080481cd <+18>:    leave
    0x080481ce <+19>:    ret
 End of assembler dump.
 (gdb) disassemble /r
 Dump of assembler code for function main:
    0x080481bb <+0>:     55      push   %ebp
    0x080481bc <+1>:     89 e5   mov    %esp,%ebp
    0x080481be <+3>:     83 ec 04        sub    $0x4,%esp
 => 0x080481c1 <+6>:     c7 04 24 4d 00 00 00    movl   $0x4d,(%esp)
    0x080481c8 <+13>:    e8 e3 ff ff ff  call   0x80481b0 <func>
    0x080481cd <+18>:    c9      leave
    0x080481ce <+19>:    c3      ret
 End of assembler dump.

Note the breakpoint at main is set at 0x080481c1.  Right at the
instruction that sets up func's argument.  Executing that instruction
should write 0x4d to the address pointed at by $esp.  However, if we
stepi, the program manages to write 52301/0xcc4d there instead (0xcc
is int3, the x86 breakpoint instruction), because the breakpoint
address is 4 bytes inside the scratch pad location, which is
0x080481bd:

 (gdb) p 0x080481c1 - 0x080481bd
 $1 = 4

IOW, instead of executing:

  "c7 04 24 4d 00 00 00" [ movl $0x4d,(%esp) ]

the inferior executes:

  "c7 04 24 4d cc 00 00" [ movl $0xcc4d,(%esp) ]

gdb/ChangeLog:
2015-10-30  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (breakpoint_in_range_p)
	(breakpoint_location_address_range_overlap): New functions.
	* breakpoint.h (breakpoint_in_range_p): New declaration.
	* infrun.c (displaced_step_prepare_throw): If there's a breakpoint
	in the scratch pad range, don't displaced step.
2015-10-30 16:00:43 +00:00
Simon Marchi 9a3c826307 Add some more casts (1/2)
Note: I needed to split this patch in two, otherwise it's too big for
the mailing list.

This patch adds explicit casts to situations where a void pointer is
assigned to a pointer to the "real" type.  Building in C++ mode requires
those assignments to use an explicit cast.  This includes, for example:

 - callback arguments (cleanups, comparison functions, ...)
 - data attached to some object (objfile, program space, etc) in the form
   of a void pointer
 - "user data" passed to some function

This patch comes from the commit "(mostly) auto-generated patch to insert
casts needed for C++", taken from Pedro's C++ branch.

Only files built on x86 with --enable-targets=all are modified, so the
native files for other arches will need to be dealt with separately.

I built-tested this with --enable-targets=all and reg-tested.  To my
surprise, a test case (selftest.exp) had to be adjusted.

Here's the ChangeLog entry.  Again, this was relatively quick to make
despite the length, thanks to David Malcom's script, although I don't
believe it's very useful information in that particular case...

gdb/ChangeLog:

	* aarch64-tdep.c (aarch64_make_prologue_cache): Add cast(s).
	(aarch64_make_stub_cache): Likewise.
	(value_of_aarch64_user_reg): Likewise.
	* ada-lang.c (ada_inferior_data_cleanup): Likewise.
	(get_ada_inferior_data): Likewise.
	(get_ada_pspace_data): Likewise.
	(ada_pspace_data_cleanup): Likewise.
	(ada_complete_symbol_matcher): Likewise.
	(ada_exc_search_name_matches): Likewise.
	* ada-tasks.c (get_ada_tasks_pspace_data): Likewise.
	(get_ada_tasks_inferior_data): Likewise.
	* addrmap.c (addrmap_mutable_foreach_worker): Likewise.
	(splay_obstack_alloc): Likewise.
	(splay_obstack_free): Likewise.
	* alpha-linux-tdep.c (alpha_linux_supply_gregset): Likewise.
	(alpha_linux_collect_gregset): Likewise.
	(alpha_linux_supply_fpregset): Likewise.
	(alpha_linux_collect_fpregset): Likewise.
	* alpha-mdebug-tdep.c (alpha_mdebug_frame_unwind_cache): Likewise.
	* alpha-tdep.c (alpha_lds): Likewise.
	(alpha_sts): Likewise.
	(alpha_sigtramp_frame_unwind_cache): Likewise.
	(alpha_heuristic_frame_unwind_cache): Likewise.
	(alpha_supply_int_regs): Likewise.
	(alpha_fill_int_regs): Likewise.
	(alpha_supply_fp_regs): Likewise.
	(alpha_fill_fp_regs): Likewise.
	* alphanbsd-tdep.c (alphanbsd_supply_fpregset): Likewise.
	(alphanbsd_aout_supply_gregset): Likewise.
	(alphanbsd_supply_gregset): Likewise.
	* amd64-linux-tdep.c (amd64_linux_init_abi): Likewise.
	(amd64_x32_linux_init_abi): Likewise.
	* amd64-nat.c (amd64_supply_native_gregset): Likewise.
	(amd64_collect_native_gregset): Likewise.
	* amd64-tdep.c (amd64_frame_cache): Likewise.
	(amd64_sigtramp_frame_cache): Likewise.
	(amd64_epilogue_frame_cache): Likewise.
	(amd64_supply_fxsave): Likewise.
	(amd64_supply_xsave): Likewise.
	(amd64_collect_fxsave): Likewise.
	(amd64_collect_xsave): Likewise.
	* amd64-windows-tdep.c (amd64_windows_frame_cache): Likewise.
	* amd64obsd-tdep.c (amd64obsd_trapframe_cache): Likewise.
	* arm-linux-tdep.c (arm_linux_supply_gregset): Likewise.
	(arm_linux_collect_gregset): Likewise.
	(arm_linux_supply_nwfpe): Likewise.
	(arm_linux_collect_nwfpe): Likewise.
	(arm_linux_supply_vfp): Likewise.
	(arm_linux_collect_vfp): Likewise.
	* arm-tdep.c (arm_find_mapping_symbol): Likewise.
	(arm_prologue_unwind_stop_reason): Likewise.
	(arm_prologue_this_id): Likewise.
	(arm_prologue_prev_register): Likewise.
	(arm_exidx_data_free): Likewise.
	(arm_find_exidx_entry): Likewise.
	(arm_stub_this_id): Likewise.
	(arm_m_exception_this_id): Likewise.
	(arm_m_exception_prev_register): Likewise.
	(arm_normal_frame_base): Likewise.
	(gdb_print_insn_arm): Likewise.
	(arm_objfile_data_free): Likewise.
	(arm_record_special_symbol): Likewise.
	(value_of_arm_user_reg): Likewise.
	* armbsd-tdep.c (armbsd_supply_fpregset): Likewise.
	(armbsd_supply_gregset): Likewise.
	* auto-load.c (auto_load_pspace_data_cleanup): Likewise.
	(get_auto_load_pspace_data): Likewise.
	(hash_loaded_script_entry): Likewise.
	(eq_loaded_script_entry): Likewise.
	(clear_section_scripts): Likewise.
	(collect_matching_scripts): Likewise.
	* auxv.c (auxv_inferior_data_cleanup): Likewise.
	(get_auxv_inferior_data): Likewise.
	* avr-tdep.c (avr_frame_unwind_cache): Likewise.
	* ax-general.c (do_free_agent_expr_cleanup): Likewise.
	* bfd-target.c (target_bfd_xfer_partial): Likewise.
	(target_bfd_xclose): Likewise.
	(target_bfd_get_section_table): Likewise.
	* bfin-tdep.c (bfin_frame_cache): Likewise.
	* block.c (find_block_in_blockvector): Likewise.
	(call_site_for_pc): Likewise.
	(block_find_non_opaque_type_preferred): Likewise.
	* break-catch-sig.c (signal_catchpoint_insert_location): Likewise.
	(signal_catchpoint_remove_location): Likewise.
	(signal_catchpoint_breakpoint_hit): Likewise.
	(signal_catchpoint_print_one): Likewise.
	(signal_catchpoint_print_mention): Likewise.
	(signal_catchpoint_print_recreate): Likewise.
	* break-catch-syscall.c (get_catch_syscall_inferior_data): Likewise.
	* breakpoint.c (do_cleanup_counted_command_line): Likewise.
	(bp_location_compare_addrs): Likewise.
	(get_first_locp_gte_addr): Likewise.
	(check_tracepoint_command): Likewise.
	(do_map_commands_command): Likewise.
	(get_breakpoint_objfile_data): Likewise.
	(free_breakpoint_probes): Likewise.
	(do_captured_breakpoint_query): Likewise.
	(compare_breakpoints): Likewise.
	(bp_location_compare): Likewise.
	(bpstat_remove_breakpoint_callback): Likewise.
	(do_delete_breakpoint_cleanup): Likewise.
	* bsd-uthread.c (bsd_uthread_set_supply_uthread): Likewise.
	(bsd_uthread_set_collect_uthread): Likewise.
	(bsd_uthread_activate): Likewise.
	(bsd_uthread_fetch_registers): Likewise.
	(bsd_uthread_store_registers): Likewise.
	* btrace.c (check_xml_btrace_version): Likewise.
	(parse_xml_btrace_block): Likewise.
	(parse_xml_btrace_pt_config_cpu): Likewise.
	(parse_xml_btrace_pt_raw): Likewise.
	(parse_xml_btrace_pt): Likewise.
	(parse_xml_btrace_conf_bts): Likewise.
	(parse_xml_btrace_conf_pt): Likewise.
	(do_btrace_data_cleanup): Likewise.
	* c-typeprint.c (find_typedef_for_canonicalize): Likewise.
	* charset.c (cleanup_iconv): Likewise.
	(do_cleanup_iterator): Likewise.
	* cli-out.c (cli_uiout_dtor): Likewise.
	(cli_table_begin): Likewise.
	(cli_table_body): Likewise.
	(cli_table_end): Likewise.
	(cli_table_header): Likewise.
	(cli_begin): Likewise.
	(cli_end): Likewise.
	(cli_field_int): Likewise.
	(cli_field_skip): Likewise.
	(cli_field_string): Likewise.
	(cli_field_fmt): Likewise.
	(cli_spaces): Likewise.
	(cli_text): Likewise.
	(cli_message): Likewise.
	(cli_wrap_hint): Likewise.
	(cli_flush): Likewise.
	(cli_redirect): Likewise.
	(out_field_fmt): Likewise.
	(field_separator): Likewise.
	(cli_out_set_stream): Likewise.
	* cli/cli-cmds.c (compare_symtabs): Likewise.
	* cli/cli-dump.c (call_dump_func): Likewise.
	(restore_section_callback): Likewise.
	* cli/cli-script.c (clear_hook_in_cleanup): Likewise.
	(do_restore_user_call_depth): Likewise.
	(do_free_command_lines_cleanup): Likewise.
	* coff-pe-read.c (get_section_vmas): Likewise.
	(pe_as16): Likewise.
	(pe_as32): Likewise.
	* coffread.c (coff_symfile_read): Likewise.
	* common/agent.c (agent_look_up_symbols): Likewise.
	* common/filestuff.c (do_close_cleanup): Likewise.
	* common/format.c (free_format_pieces_cleanup): Likewise.
	* common/vec.c (vec_o_reserve): Likewise.
	* compile/compile-c-support.c (print_one_macro): Likewise.
	* compile/compile-c-symbols.c (hash_symbol_error): Likewise.
	(eq_symbol_error): Likewise.
	(del_symbol_error): Likewise.
	(error_symbol_once): Likewise.
	(gcc_convert_symbol): Likewise.
	(gcc_symbol_address): Likewise.
	(hash_symname): Likewise.
	(eq_symname): Likewise.
	* compile/compile-c-types.c (hash_type_map_instance): Likewise.
	(eq_type_map_instance): Likewise.
	(insert_type): Likewise.
	(convert_type): Likewise.
	* compile/compile-object-load.c (munmap_listp_free_cleanup): Likewise.
	(setup_sections): Likewise.
	(link_hash_table_free): Likewise.
	(copy_sections): Likewise.
	* compile/compile-object-run.c (do_module_cleanup): Likewise.
	* compile/compile.c (compile_print_value): Likewise.
	(do_rmdir): Likewise.
	(cleanup_compile_instance): Likewise.
	(cleanup_unlink_file): Likewise.
	* completer.c (free_completion_tracker): Likewise.
	* corelow.c (add_to_spuid_list): Likewise.
	* cp-namespace.c (reset_directive_searched): Likewise.
	* cp-support.c (reset_directive_searched): Likewise.
	* cris-tdep.c (cris_sigtramp_frame_unwind_cache): Likewise.
	(cris_frame_unwind_cache): Likewise.
	* d-lang.c (builtin_d_type): Likewise.
	* d-namespace.c (reset_directive_searched): Likewise.
	* dbxread.c (dbx_free_symfile_info): Likewise.
	(do_free_bincl_list_cleanup): Likewise.
	* disasm.c (hash_dis_line_entry): Likewise.
	(eq_dis_line_entry): Likewise.
	(dis_asm_print_address): Likewise.
	(fprintf_disasm): Likewise.
	(do_ui_file_delete): Likewise.
	* doublest.c (convert_floatformat_to_doublest): Likewise.
	* dummy-frame.c (pop_dummy_frame_bpt): Likewise.
	(dummy_frame_prev_register): Likewise.
	(dummy_frame_this_id): Likewise.
	* dwarf2-frame-tailcall.c (cache_hash): Likewise.
	(cache_eq): Likewise.
	(cache_find): Likewise.
	(tailcall_frame_this_id): Likewise.
	(dwarf2_tailcall_prev_register_first): Likewise.
	(tailcall_frame_prev_register): Likewise.
	(tailcall_frame_dealloc_cache): Likewise.
	(tailcall_frame_prev_arch): Likewise.
	* dwarf2-frame.c (dwarf2_frame_state_free): Likewise.
	(dwarf2_frame_set_init_reg): Likewise.
	(dwarf2_frame_init_reg): Likewise.
	(dwarf2_frame_set_signal_frame_p): Likewise.
	(dwarf2_frame_signal_frame_p): Likewise.
	(dwarf2_frame_set_adjust_regnum): Likewise.
	(dwarf2_frame_adjust_regnum): Likewise.
	(clear_pointer_cleanup): Likewise.
	(dwarf2_frame_cache): Likewise.
	(find_cie): Likewise.
	(dwarf2_frame_find_fde): Likewise.
	* dwarf2expr.c (dwarf_expr_address_type): Likewise.
	(free_dwarf_expr_context_cleanup): Likewise.
	* dwarf2loc.c (locexpr_find_frame_base_location): Likewise.
	(locexpr_get_frame_base): Likewise.
	(loclist_find_frame_base_location): Likewise.
	(loclist_get_frame_base): Likewise.
	(dwarf_expr_dwarf_call): Likewise.
	(dwarf_expr_get_base_type): Likewise.
	(dwarf_expr_push_dwarf_reg_entry_value): Likewise.
	(dwarf_expr_get_obj_addr): Likewise.
	(entry_data_value_coerce_ref): Likewise.
	(entry_data_value_copy_closure): Likewise.
	(entry_data_value_free_closure): Likewise.
	(get_frame_address_in_block_wrapper): Likewise.
	(dwarf2_evaluate_property): Likewise.
	(dwarf2_compile_property_to_c): Likewise.
	(needs_frame_read_addr_from_reg): Likewise.
	(needs_frame_get_reg_value): Likewise.
	(needs_frame_frame_base): Likewise.
	(needs_frame_frame_cfa): Likewise.
	(needs_frame_tls_address): Likewise.
	(needs_frame_dwarf_call): Likewise.
	(needs_dwarf_reg_entry_value): Likewise.
	(get_ax_pc): Likewise.
	(locexpr_read_variable): Likewise.
	(locexpr_read_variable_at_entry): Likewise.
	(locexpr_read_needs_frame): Likewise.
	(locexpr_describe_location): Likewise.
	(locexpr_tracepoint_var_ref): Likewise.
	(locexpr_generate_c_location): Likewise.
	(loclist_read_variable): Likewise.
	(loclist_read_variable_at_entry): Likewise.
	(loclist_describe_location): Likewise.
	(loclist_tracepoint_var_ref): Likewise.
	(loclist_generate_c_location): Likewise.
	* dwarf2read.c (line_header_hash_voidp): Likewise.
	(line_header_eq_voidp): Likewise.
	(dwarf2_has_info): Likewise.
	(dwarf2_get_section_info): Likewise.
	(locate_dwz_sections): Likewise.
	(hash_file_name_entry): Likewise.
	(eq_file_name_entry): Likewise.
	(delete_file_name_entry): Likewise.
	(dw2_setup): Likewise.
	(dw2_get_file_names_reader): Likewise.
	(dw2_find_pc_sect_compunit_symtab): Likewise.
	(hash_signatured_type): Likewise.
	(eq_signatured_type): Likewise.
	(add_signatured_type_cu_to_table): Likewise.
	(create_debug_types_hash_table): Likewise.
	(lookup_dwo_signatured_type): Likewise.
	(lookup_dwp_signatured_type): Likewise.
	(lookup_signatured_type): Likewise.
	(hash_type_unit_group): Likewise.
	(eq_type_unit_group): Likewise.
	(get_type_unit_group): Likewise.
	(process_psymtab_comp_unit_reader): Likewise.
	(sort_tu_by_abbrev_offset): Likewise.
	(process_skeletonless_type_unit): Likewise.
	(psymtabs_addrmap_cleanup): Likewise.
	(dwarf2_read_symtab): Likewise.
	(psymtab_to_symtab_1): Likewise.
	(die_hash): Likewise.
	(die_eq): Likewise.
	(load_full_comp_unit_reader): Likewise.
	(reset_die_in_process): Likewise.
	(free_cu_line_header): Likewise.
	(handle_DW_AT_stmt_list): Likewise.
	(hash_dwo_file): Likewise.
	(eq_dwo_file): Likewise.
	(hash_dwo_unit): Likewise.
	(eq_dwo_unit): Likewise.
	(create_dwo_cu_reader): Likewise.
	(create_dwo_unit_in_dwp_v1): Likewise.
	(create_dwo_unit_in_dwp_v2): Likewise.
	(lookup_dwo_unit_in_dwp): Likewise.
	(dwarf2_locate_dwo_sections): Likewise.
	(dwarf2_locate_common_dwp_sections): Likewise.
	(dwarf2_locate_v2_dwp_sections): Likewise.
	(hash_dwp_loaded_cutus): Likewise.
	(eq_dwp_loaded_cutus): Likewise.
	(lookup_dwo_cutu): Likewise.
	(abbrev_table_free_cleanup): Likewise.
	(dwarf2_free_abbrev_table): Likewise.
	(find_partial_die_in_comp_unit): Likewise.
	(free_line_header_voidp): Likewise.
	(follow_die_offset): Likewise.
	(follow_die_sig_1): Likewise.
	(free_heap_comp_unit): Likewise.
	(free_stack_comp_unit): Likewise.
	(dwarf2_free_objfile): Likewise.
	(per_cu_offset_and_type_hash): Likewise.
	(per_cu_offset_and_type_eq): Likewise.
	(get_die_type_at_offset): Likewise.
	(partial_die_hash): Likewise.
	(partial_die_eq): Likewise.
	(dwarf2_per_objfile_free): Likewise.
	(hash_strtab_entry): Likewise.
	(eq_strtab_entry): Likewise.
	(add_string): Likewise.
	(hash_symtab_entry): Likewise.
	(eq_symtab_entry): Likewise.
	(delete_symtab_entry): Likewise.
	(cleanup_mapped_symtab): Likewise.
	(add_indices_to_cpool): Likewise.
	(hash_psymtab_cu_index): Likewise.
	(eq_psymtab_cu_index): Likewise.
	(add_address_entry_worker): Likewise.
	(unlink_if_set): Likewise.
	(write_one_signatured_type): Likewise.
	(save_gdb_index_command): Likewise.
	* elfread.c (elf_symtab_read): Likewise.
	(elf_gnu_ifunc_cache_hash): Likewise.
	(elf_gnu_ifunc_cache_eq): Likewise.
	(elf_gnu_ifunc_record_cache): Likewise.
	(elf_gnu_ifunc_resolve_by_cache): Likewise.
	(elf_get_probes): Likewise.
	(probe_key_free): Likewise.
	* f-lang.c (builtin_f_type): Likewise.
	* frame-base.c (frame_base_append_sniffer): Likewise.
	(frame_base_set_default): Likewise.
	(frame_base_find_by_frame): Likewise.
	* frame-unwind.c (frame_unwind_prepend_unwinder): Likewise.
	(frame_unwind_append_unwinder): Likewise.
	(frame_unwind_find_by_frame): Likewise.
	* frame.c (frame_addr_hash): Likewise.
	(frame_addr_hash_eq): Likewise.
	(frame_stash_find): Likewise.
	(do_frame_register_read): Likewise.
	(unwind_to_current_frame): Likewise.
	(frame_cleanup_after_sniffer): Likewise.
	* frv-linux-tdep.c (frv_linux_sigtramp_frame_cache): Likewise.
	* frv-tdep.c (frv_frame_unwind_cache): Likewise.
	* ft32-tdep.c (ft32_frame_cache): Likewise.
	* gcore.c (do_bfd_delete_cleanup): Likewise.
	(gcore_create_callback): Likewise.
	* gdb_bfd.c (hash_bfd): Likewise.
	(eq_bfd): Likewise.
	(gdb_bfd_open): Likewise.
	(free_one_bfd_section): Likewise.
	(gdb_bfd_ref): Likewise.
	(gdb_bfd_unref): Likewise.
	(get_section_descriptor): Likewise.
	(gdb_bfd_map_section): Likewise.
	(gdb_bfd_crc): Likewise.
	(gdb_bfd_mark_parent): Likewise.
	(gdb_bfd_record_inclusion): Likewise.
	(gdb_bfd_requires_relocations): Likewise.
	(print_one_bfd): Likewise.
	* gdbtypes.c (type_pair_hash): Likewise.
	(type_pair_eq): Likewise.
	(builtin_type): Likewise.
	(objfile_type): Likewise.
	* gnu-v3-abi.c (vtable_ptrdiff_type): Likewise.
	(vtable_address_point_offset): Likewise.
	(gnuv3_get_vtable): Likewise.
	(hash_value_and_voffset): Likewise.
	(eq_value_and_voffset): Likewise.
	(compare_value_and_voffset): Likewise.
	(compute_vtable_size): Likewise.
	(gnuv3_get_typeid_type): Likewise.
	* go-lang.c (builtin_go_type): Likewise.
	* guile/scm-block.c (bkscm_hash_block_smob): Likewise.
	(bkscm_eq_block_smob): Likewise.
	(bkscm_objfile_block_map): Likewise.
	(bkscm_del_objfile_blocks): Likewise.
	* guile/scm-breakpoint.c (bpscm_build_bp_list): Likewise.
	* guile/scm-disasm.c (gdbscm_disasm_read_memory_worker): Likewise.
	(gdbscm_disasm_print_address): Likewise.
	* guile/scm-frame.c (frscm_hash_frame_smob): Likewise.
	(frscm_eq_frame_smob): Likewise.
	(frscm_inferior_frame_map): Likewise.
	(frscm_del_inferior_frames): Likewise.
	* guile/scm-gsmob.c (gdbscm_add_objfile_ref): Likewise.
	* guile/scm-objfile.c (ofscm_handle_objfile_deleted): Likewise.
	(ofscm_objfile_smob_from_objfile): Likewise.
	* guile/scm-ports.c (ioscm_write): Likewise.
	(ioscm_file_port_delete): Likewise.
	(ioscm_file_port_rewind): Likewise.
	(ioscm_file_port_put): Likewise.
	(ioscm_file_port_write): Likewise.
	* guile/scm-progspace.c (psscm_handle_pspace_deleted): Likewise.
	(psscm_pspace_smob_from_pspace): Likewise.
	* guile/scm-safe-call.c (scscm_recording_pre_unwind_handler): Likewise.
	(scscm_recording_unwind_handler): Likewise.
	(gdbscm_with_catch): Likewise.
	(scscm_call_0_body): Likewise.
	(scscm_call_1_body): Likewise.
	(scscm_call_2_body): Likewise.
	(scscm_call_3_body): Likewise.
	(scscm_call_4_body): Likewise.
	(scscm_apply_1_body): Likewise.
	(scscm_eval_scheme_string): Likewise.
	(gdbscm_safe_eval_string): Likewise.
	(scscm_source_scheme_script): Likewise.
	(gdbscm_safe_source_script): Likewise.
	* guile/scm-string.c (gdbscm_call_scm_to_stringn): Likewise.
	(gdbscm_call_scm_from_stringn): Likewise.
	* guile/scm-symbol.c (syscm_hash_symbol_smob): Likewise.
	(syscm_eq_symbol_smob): Likewise.
	(syscm_get_symbol_map): Likewise.
	(syscm_del_objfile_symbols): Likewise.
	* guile/scm-symtab.c (stscm_hash_symtab_smob): Likewise.
	(stscm_eq_symtab_smob): Likewise.
	(stscm_objfile_symtab_map): Likewise.
	(stscm_del_objfile_symtabs): Likewise.
	* guile/scm-type.c (tyscm_hash_type_smob): Likewise.
	(tyscm_eq_type_smob): Likewise.
	(tyscm_type_map): Likewise.
	(tyscm_copy_type_recursive): Likewise.
	(save_objfile_types): Likewise.
	* guile/scm-utils.c (extract_arg): Likewise.
	* h8300-tdep.c (h8300_frame_cache): Likewise.
	* hppa-linux-tdep.c (hppa_linux_sigtramp_frame_unwind_cache): Likewise.
	* hppa-tdep.c (compare_unwind_entries): Likewise.
	(find_unwind_entry): Likewise.
	(hppa_frame_cache): Likewise.
	(hppa_stub_frame_unwind_cache): Likewise.
	* hppanbsd-tdep.c (hppanbsd_supply_gregset): Likewise.
	* hppaobsd-tdep.c (hppaobsd_supply_gregset): Likewise.
	(hppaobsd_supply_fpregset): Likewise.
	* i386-cygwin-tdep.c (core_process_module_section): Likewise.
	* i386-linux-tdep.c (i386_linux_init_abi): Likewise.
	* i386-tdep.c (i386_frame_cache): Likewise.
	(i386_epilogue_frame_cache): Likewise.
	(i386_sigtramp_frame_cache): Likewise.
	(i386_supply_gregset): Likewise.
	(i386_collect_gregset): Likewise.
	(i386_gdbarch_init): Likewise.
	* i386obsd-tdep.c (i386obsd_aout_supply_regset): Likewise.
	(i386obsd_trapframe_cache): Likewise.
	* i387-tdep.c (i387_supply_fsave): Likewise.
	(i387_collect_fsave): Likewise.
	(i387_supply_fxsave): Likewise.
	(i387_collect_fxsave): Likewise.
	(i387_supply_xsave): Likewise.
	(i387_collect_xsave): Likewise.
	* ia64-tdep.c (ia64_frame_cache): Likewise.
	(ia64_sigtramp_frame_cache): Likewise.
	* infcmd.c (attach_command_continuation): Likewise.
	(attach_command_continuation_free_args): Likewise.
	* inferior.c (restore_inferior): Likewise.
	(delete_thread_of_inferior): Likewise.
	* inflow.c (inflow_inferior_data_cleanup): Likewise.
	(get_inflow_inferior_data): Likewise.
	(inflow_inferior_exit): Likewise.
	* infrun.c (displaced_step_clear_cleanup): Likewise.
	(restore_current_uiout_cleanup): Likewise.
	(release_stop_context_cleanup): Likewise.
	(do_restore_infcall_suspend_state_cleanup): Likewise.
	(do_restore_infcall_control_state_cleanup): Likewise.
	(restore_inferior_ptid): Likewise.
	* inline-frame.c (block_starting_point_at): Likewise.
	* iq2000-tdep.c (iq2000_frame_cache): Likewise.
	* jit.c (get_jit_objfile_data): Likewise.
	(get_jit_program_space_data): Likewise.
	(jit_object_close_impl): Likewise.
	(jit_find_objf_with_entry_addr): Likewise.
	(jit_breakpoint_deleted): Likewise.
	(jit_unwind_reg_set_impl): Likewise.
	(jit_unwind_reg_get_impl): Likewise.
	(jit_dealloc_cache): Likewise.
	(jit_frame_sniffer): Likewise.
	(jit_frame_prev_register): Likewise.
	(jit_prepend_unwinder): Likewise.
	(jit_inferior_exit_hook): Likewise.
	(free_objfile_data): Likewise.
	* jv-lang.c (jv_per_objfile_free): Likewise.
	(get_dynamics_objfile): Likewise.
	(get_java_class_symtab): Likewise.
	(builtin_java_type): Likewise.
	* language.c (language_string_char_type): Likewise.
	(language_bool_type): Likewise.
	(language_lookup_primitive_type): Likewise.
	(language_lookup_primitive_type_as_symbol): Likewise.
	* linespec.c (hash_address_entry): Likewise.
	(eq_address_entry): Likewise.
	(iterate_inline_only): Likewise.
	(iterate_name_matcher): Likewise.
	(decode_line_2_compare_items): Likewise.
	(collect_one_symbol): Likewise.
	(compare_symbols): Likewise.
	(compare_msymbols): Likewise.
	(add_symtabs_to_list): Likewise.
	(collect_symbols): Likewise.
	(compare_msyms): Likewise.
	(add_minsym): Likewise.
	(cleanup_linespec_result): Likewise.
	* linux-fork.c (inferior_call_waitpid_cleanup): Likewise.
	* linux-nat.c (delete_lwp_cleanup): Likewise.
	(count_events_callback): Likewise.
	(select_event_lwp_callback): Likewise.
	(resume_stopped_resumed_lwps): Likewise.
	* linux-tdep.c (get_linux_gdbarch_data): Likewise.
	(invalidate_linux_cache_inf): Likewise.
	(get_linux_inferior_data): Likewise.
	(linux_find_memory_regions_thunk): Likewise.
	(linux_make_mappings_callback): Likewise.
	(linux_corefile_thread_callback): Likewise.
	(find_mapping_size): Likewise.
	* linux-thread-db.c (find_new_threads_callback): Likewise.
	* lm32-tdep.c (lm32_frame_cache): Likewise.
	* m2-lang.c (builtin_m2_type): Likewise.
	* m32c-tdep.c (m32c_analyze_frame_prologue): Likewise.
	* m32r-linux-tdep.c (m32r_linux_sigtramp_frame_cache): Likewise.
	(m32r_linux_supply_gregset): Likewise.
	(m32r_linux_collect_gregset): Likewise.
	* m32r-tdep.c (m32r_frame_unwind_cache): Likewise.
	* m68hc11-tdep.c (m68hc11_frame_unwind_cache): Likewise.
	* m68k-tdep.c (m68k_frame_cache): Likewise.
	* m68kbsd-tdep.c (m68kbsd_supply_fpregset): Likewise.
	(m68kbsd_supply_gregset): Likewise.
	* m68klinux-tdep.c (m68k_linux_sigtramp_frame_cache): Likewise.
	* m88k-tdep.c (m88k_frame_cache): Likewise.
	(m88k_supply_gregset): Likewise.

gdb/gdbserver/ChangeLog:

	* dll.c (match_dll): Add cast(s).
	(unloaded_dll): Likewise.
	* linux-low.c (second_thread_of_pid_p): Likewise.
	(delete_lwp_callback): Likewise.
	(count_events_callback): Likewise.
	(select_event_lwp_callback): Likewise.
	(linux_set_resume_request): Likewise.
	* server.c (accumulate_file_name_length): Likewise.
	(emit_dll_description): Likewise.
	(handle_qxfer_threads_worker): Likewise.
	(visit_actioned_threads): Likewise.
	* thread-db.c (any_thread_of): Likewise.
	* tracepoint.c (same_process_p): Likewise.
	(match_blocktype): Likewise.
	(build_traceframe_info_xml): Likewise.

gdb/testsuite/ChangeLog:

	* gdb.gdb/selftest.exp (do_steps_and_nexts): Adjust expected
	source line.
2015-09-25 14:08:07 -04:00
Simon Marchi 224c3ddb89 Add casts to memory allocation related calls
Most allocation functions (if not all) return a void* pointing to the
allocated memory.  In C++, we need to add an explicit cast when
assigning the result to a pointer to another type (which is the case
more often than not).

The content of this patch is taken from Pedro's branch, from commit
"(mostly) auto-generated patch to insert casts needed for C++".  I
validated that the changes make sense and manually reflowed the code to
make it respect the coding style.  I also found multiple places where I
could use XNEW/XNEWVEC/XRESIZEVEC/etc.

Thanks a lot to whoever did that automated script to insert casts, doing
it completely by hand would have taken a ridiculous amount of time.

Only files built on x86 with --enable-targets=all are modified.  This
means that all other -nat.c files are untouched and will have to be
dealt with later by using appropiate compilers.  Or maybe we can try to
build them with a regular g++ just to know where to add casts, I don't
know.

I built-tested this with --enable-targets=all and reg-tested.

Here's the changelog entry, which was not too bad to make despite the
size, thanks to David Malcom's script.  I fixed some bits by hand, but
there might be some wrong parts left (hopefully not).

gdb/ChangeLog:

	* aarch64-linux-tdep.c (aarch64_stap_parse_special_token): Add cast
	to allocation result assignment.
	* ada-exp.y (write_object_renaming): Likewise.
	(write_ambiguous_var): Likewise.
	(ada_nget_field_index): Likewise.
	(write_var_or_type): Likewise.
	* ada-lang.c (ada_decode_symbol): Likewise.
	(ada_value_assign): Likewise.
	(value_pointer): Likewise.
	(cache_symbol): Likewise.
	(add_nonlocal_symbols): Likewise.
	(ada_name_for_lookup): Likewise.
	(symbol_completion_add): Likewise.
	(ada_to_fixed_type_1): Likewise.
	(ada_get_next_arg): Likewise.
	(defns_collected): Likewise.
	* ada-lex.l (processId): Likewise.
	(processString): Likewise.
	* ada-tasks.c (read_known_tasks_array): Likewise.
	(read_known_tasks_list): Likewise.
	* ada-typeprint.c (decoded_type_name): Likewise.
	* addrmap.c (addrmap_mutable_create_fixed): Likewise.
	* amd64-tdep.c (amd64_push_arguments): Likewise.
	(amd64_displaced_step_copy_insn): Likewise.
	(amd64_classify_insn_at): Likewise.
	(amd64_relocate_instruction): Likewise.
	* amd64obsd-tdep.c (amd64obsd_sigtramp_p): Likewise.
	* arch-utils.c (simple_displaced_step_copy_insn): Likewise.
	(initialize_current_architecture): Likewise.
	* arm-linux-tdep.c (arm_stap_parse_special_token): Likewise.
	* arm-symbian-tdep.c (arm_symbian_osabi_sniffer): Likewise.
	* arm-tdep.c (arm_exidx_new_objfile): Likewise.
	(arm_push_dummy_call): Likewise.
	(extend_buffer_earlier): Likewise.
	(arm_adjust_breakpoint_address): Likewise.
	(arm_skip_stub): Likewise.
	* auto-load.c (filename_is_in_pattern): Likewise.
	(maybe_add_script_file): Likewise.
	(maybe_add_script_text): Likewise.
	(auto_load_objfile_script_1): Likewise.
	* auxv.c (ld_so_xfer_auxv): Likewise.
	* ax-general.c (new_agent_expr): Likewise.
	(grow_expr): Likewise.
	(ax_reg_mask): Likewise.
	* bcache.c (bcache_full): Likewise.
	* breakpoint.c (program_breakpoint_here_p): Likewise.
	* btrace.c (parse_xml_raw): Likewise.
	* build-id.c (build_id_to_debug_bfd): Likewise.
	* buildsym.c (end_symtab_with_blockvector): Likewise.
	* c-exp.y (string_exp): Likewise.
	(qualified_name): Likewise.
	(write_destructor_name): Likewise.
	(operator_stoken): Likewise.
	(parse_number): Likewise.
	(scan_macro_expansion): Likewise.
	(yylex): Likewise.
	(c_print_token): Likewise.
	* c-lang.c (c_get_string): Likewise.
	(emit_numeric_character): Likewise.
	* charset.c (wchar_iterate): Likewise.
	* cli/cli-cmds.c (complete_command): Likewise.
	(make_command): Likewise.
	* cli/cli-dump.c (restore_section_callback): Likewise.
	(restore_binary_file): Likewise.
	* cli/cli-interp.c (cli_interpreter_exec): Likewise.
	* cli/cli-script.c (execute_control_command): Likewise.
	* cli/cli-setshow.c (do_set_command): Likewise.
	* coff-pe-read.c (add_pe_forwarded_sym): Likewise.
	(read_pe_exported_syms): Likewise.
	* coffread.c (coff_read_struct_type): Likewise.
	(coff_read_enum_type): Likewise.
	* common/btrace-common.c (btrace_data_append): Likewise.
	* common/buffer.c (buffer_grow): Likewise.
	* common/filestuff.c (gdb_fopen_cloexec): Likewise.
	* common/format.c (parse_format_string): Likewise.
	* common/gdb_vecs.c (delim_string_to_char_ptr_vec_append): Likewise.
	* common/xml-utils.c (xml_escape_text): Likewise.
	* compile/compile-object-load.c (copy_sections): Likewise.
	(compile_object_load): Likewise.
	* compile/compile-object-run.c (compile_object_run): Likewise.
	* completer.c (filename_completer): Likewise.
	* corefile.c (read_memory_typed_address): Likewise.
	(write_memory_unsigned_integer): Likewise.
	(write_memory_signed_integer): Likewise.
	(complete_set_gnutarget): Likewise.
	* corelow.c (get_core_register_section): Likewise.
	* cp-name-parser.y (d_grab): Likewise.
	(allocate_info): Likewise.
	(cp_new_demangle_parse_info): Likewise.
	* cp-namespace.c (cp_scan_for_anonymous_namespaces): Likewise.
	(cp_lookup_symbol_in_namespace): Likewise.
	(lookup_namespace_scope): Likewise.
	(find_symbol_in_baseclass): Likewise.
	(cp_lookup_nested_symbol): Likewise.
	(cp_lookup_transparent_type_loop): Likewise.
	* cp-support.c (copy_string_to_obstack): Likewise.
	(make_symbol_overload_list): Likewise.
	(make_symbol_overload_list_namespace): Likewise.
	(make_symbol_overload_list_adl_namespace): Likewise.
	(first_component_command): Likewise.
	* cp-valprint.c (cp_print_value): Likewise.
	* ctf.c (ctf_xfer_partial): Likewise.
	* d-exp.y (StringExp): Likewise.
	* d-namespace.c (d_lookup_symbol_in_module): Likewise.
	(lookup_module_scope): Likewise.
	(find_symbol_in_baseclass): Likewise.
	(d_lookup_nested_symbol): Likewise.
	* dbxread.c (find_stab_function_addr): Likewise.
	(read_dbx_symtab): Likewise.
	(dbx_end_psymtab): Likewise.
	(cp_set_block_scope): Likewise.
	* dcache.c (dcache_alloc): Likewise.
	* demangle.c (_initialize_demangler): Likewise.
	* dicos-tdep.c (dicos_load_module_p): Likewise.
	* dictionary.c (dict_create_hashed_expandable): Likewise.
	(dict_create_linear_expandable): Likewise.
	(expand_hashtable): Likewise.
	(add_symbol_linear_expandable): Likewise.
	* dwarf2-frame.c (add_cie): Likewise.
	(add_fde): Likewise.
	(dwarf2_build_frame_info): Likewise.
	* dwarf2expr.c (dwarf_expr_grow_stack): Likewise.
	(dwarf_expr_fetch_address): Likewise.
	(add_piece): Likewise.
	(execute_stack_op): Likewise.
	* dwarf2loc.c (chain_candidate): Likewise.
	(dwarf_entry_parameter_to_value): Likewise.
	(read_pieced_value): Likewise.
	(write_pieced_value): Likewise.
	* dwarf2read.c (dwarf2_read_section): Likewise.
	(add_type_unit): Likewise.
	(read_comp_units_from_section): Likewise.
	(fixup_go_packaging): Likewise.
	(dwarf2_compute_name): Likewise.
	(dwarf2_physname): Likewise.
	(create_dwo_unit_in_dwp_v1): Likewise.
	(create_dwo_unit_in_dwp_v2): Likewise.
	(read_func_scope): Likewise.
	(read_call_site_scope): Likewise.
	(dwarf2_attach_fields_to_type): Likewise.
	(process_structure_scope): Likewise.
	(mark_common_block_symbol_computed): Likewise.
	(read_common_block): Likewise.
	(abbrev_table_read_table): Likewise.
	(guess_partial_die_structure_name): Likewise.
	(fixup_partial_die): Likewise.
	(add_file_name): Likewise.
	(dwarf2_const_value_data): Likewise.
	(dwarf2_const_value_attr): Likewise.
	(build_error_marker_type): Likewise.
	(guess_full_die_structure_name): Likewise.
	(anonymous_struct_prefix): Likewise.
	(typename_concat): Likewise.
	(dwarf2_canonicalize_name): Likewise.
	(dwarf2_name): Likewise.
	(write_constant_as_bytes): Likewise.
	(dwarf2_fetch_constant_bytes): Likewise.
	(copy_string): Likewise.
	(parse_macro_definition): Likewise.
	* elfread.c (elf_symfile_segments): Likewise.
	(elf_rel_plt_read): Likewise.
	(elf_gnu_ifunc_resolve_by_cache): Likewise.
	(elf_gnu_ifunc_resolve_by_got): Likewise.
	(elf_read_minimal_symbols): Likewise.
	(elf_gnu_ifunc_record_cache): Likewise.
	* event-top.c (top_level_prompt): Likewise.
	(command_line_handler): Likewise.
	* exec.c (resize_section_table): Likewise.
	* expprint.c (print_subexp_standard): Likewise.
	* fbsd-tdep.c (fbsd_collect_regset_section_cb): Likewise.
	* findcmd.c (parse_find_args): Likewise.
	* findvar.c (address_from_register): Likewise.
	* frame.c (get_prev_frame_always): Likewise.
	* gdb_bfd.c (gdb_bfd_ref): Likewise.
	(get_section_descriptor): Likewise.
	* gdb_obstack.c (obconcat): Likewise.
	(obstack_strdup): Likewise.
	* gdbtypes.c (lookup_function_type_with_arguments): Likewise.
	(create_set_type): Likewise.
	(lookup_unsigned_typename): Likewise.
	(lookup_signed_typename): Likewise.
	(resolve_dynamic_union): Likewise.
	(resolve_dynamic_struct): Likewise.
	(add_dyn_prop): Likewise.
	(copy_dynamic_prop_list): Likewise.
	(arch_flags_type): Likewise.
	(append_composite_type_field_raw): Likewise.
	* gdbtypes.h (INIT_FUNC_SPECIFIC): Likewise.
	* gnu-v3-abi.c (gnuv3_rtti_type): Likewise.
	* go-exp.y (string_exp): Likewise.
	* go-lang.c (go_demangle): Likewise.
	* guile/guile.c (compute_scheme_string): Likewise.
	* guile/scm-cmd.c (gdbscm_parse_command_name): Likewise.
	(gdbscm_canonicalize_command_name): Likewise.
	* guile/scm-ports.c (ioscm_init_stdio_buffers): Likewise.
	(ioscm_init_memory_port): Likewise.
	(ioscm_reinit_memory_port): Likewise.
	* guile/scm-utils.c (gdbscm_gc_xstrdup): Likewise.
	(gdbscm_gc_dup_argv): Likewise.
	* h8300-tdep.c (h8300_push_dummy_call): Likewise.
	* hppa-tdep.c (internalize_unwinds): Likewise.
	(read_unwind_info): Likewise.
	* i386-cygwin-tdep.c (core_process_module_section): Likewise.
	(windows_core_xfer_shared_libraries): Likewise.
	* i386-tdep.c (i386_displaced_step_copy_insn): Likewise.
	(i386_stap_parse_special_token_triplet): Likewise.
	(i386_stap_parse_special_token_three_arg_disp): Likewise.
	* i386obsd-tdep.c (i386obsd_sigtramp_p): Likewise.
	* inf-child.c (inf_child_fileio_readlink): Likewise.
	* inf-ptrace.c (inf_ptrace_fetch_register): Likewise.
	(inf_ptrace_store_register): Likewise.
	* infrun.c (follow_exec): Likewise.
	(displaced_step_prepare_throw): Likewise.
	(save_stop_context): Likewise.
	(save_infcall_suspend_state): Likewise.
	* jit.c (jit_read_descriptor): Likewise.
	(jit_read_code_entry): Likewise.
	(jit_symtab_line_mapping_add_impl): Likewise.
	(finalize_symtab): Likewise.
	(jit_unwind_reg_get_impl): Likewise.
	* jv-exp.y (QualifiedName): Likewise.
	* jv-lang.c (get_java_utf8_name): Likewise.
	(type_from_class): Likewise.
	(java_demangle_type_signature): Likewise.
	(java_class_name_from_physname): Likewise.
	* jv-typeprint.c (java_type_print_base): Likewise.
	* jv-valprint.c (java_value_print): Likewise.
	* language.c (add_language): Likewise.
	* linespec.c (add_sal_to_sals_basic): Likewise.
	(add_sal_to_sals): Likewise.
	(decode_objc): Likewise.
	(find_linespec_symbols): Likewise.
	* linux-fork.c (fork_save_infrun_state): Likewise.
	* linux-nat.c (linux_nat_detach): Likewise.
	(linux_nat_fileio_readlink): Likewise.
	* linux-record.c (record_linux_sockaddr): Likewise.
	(record_linux_msghdr): Likewise.
	(Do): Likewise.
	* linux-tdep.c (linux_core_info_proc_mappings): Likewise.
	(linux_collect_regset_section_cb): Likewise.
	(linux_get_siginfo_data): Likewise.
	* linux-thread-db.c (try_thread_db_load_from_pdir_1): Likewise.
	(try_thread_db_load_from_dir): Likewise.
	(thread_db_load_search): Likewise.
	(info_auto_load_libthread_db): Likewise.
	* m32c-tdep.c (m32c_m16c_address_to_pointer): Likewise.
	(m32c_m16c_pointer_to_address): Likewise.
	* m68hc11-tdep.c (m68hc11_pseudo_register_write): Likewise.
	* m68k-tdep.c (m68k_get_longjmp_target): Likewise.
	* machoread.c (macho_check_dsym): Likewise.
	* macroexp.c (resize_buffer): Likewise.
	(gather_arguments): Likewise.
	(maybe_expand): Likewise.
	* macrotab.c (new_macro_key): Likewise.
	(new_source_file): Likewise.
	(new_macro_definition): Likewise.
	* mdebugread.c (parse_symbol): Likewise.
	(parse_type): Likewise.
	(parse_partial_symbols): Likewise.
	(psymtab_to_symtab_1): Likewise.
	* mem-break.c (default_memory_insert_breakpoint): Likewise.
	* mi/mi-cmd-break.c (mi_argv_to_format): Likewise.
	* mi/mi-main.c (mi_cmd_data_read_memory): Likewise.
	(mi_cmd_data_read_memory_bytes): Likewise.
	(mi_cmd_data_write_memory_bytes): Likewise.
	(mi_cmd_trace_frame_collected): Likewise.
	* mi/mi-parse.c (mi_parse_argv): Likewise.
	(mi_parse): Likewise.
	* minidebug.c (lzma_open): Likewise.
	(lzma_pread): Likewise.
	* mips-tdep.c (mips_read_fp_register_single): Likewise.
	(mips_print_fp_register): Likewise.
	* mipsnbsd-tdep.c (mipsnbsd_get_longjmp_target): Likewise.
	* mipsread.c (read_alphacoff_dynamic_symtab): Likewise.
	* mt-tdep.c (mt_register_name): Likewise.
	(mt_registers_info): Likewise.
	(mt_push_dummy_call): Likewise.
	* namespace.c (add_using_directive): Likewise.
	* nat/linux-btrace.c (perf_event_read): Likewise.
	(linux_enable_bts): Likewise.
	* nat/linux-osdata.c (linux_common_core_of_thread): Likewise.
	* nat/linux-ptrace.c (linux_ptrace_test_ret_to_nx): Likewise.
	* nto-tdep.c (nto_find_and_open_solib): Likewise.
	(nto_parse_redirection): Likewise.
	* objc-lang.c (objc_demangle): Likewise.
	(find_methods): Likewise.
	* objfiles.c (get_objfile_bfd_data): Likewise.
	(set_objfile_main_name): Likewise.
	(allocate_objfile): Likewise.
	(objfile_relocate): Likewise.
	(update_section_map): Likewise.
	* osabi.c (generic_elf_osabi_sniff_abi_tag_sections): Likewise.
	* p-exp.y (exp): Likewise.
	(yylex): Likewise.
	* p-valprint.c (pascal_object_print_value): Likewise.
	* parse.c (initialize_expout): Likewise.
	(mark_completion_tag): Likewise.
	(copy_name): Likewise.
	(parse_float): Likewise.
	(type_stack_reserve): Likewise.
	* ppc-linux-tdep.c (ppc_stap_parse_special_token): Likewise.
	(ppu2spu_prev_register): Likewise.
	* ppc-ravenscar-thread.c (supply_register_at_address): Likewise.
	* printcmd.c (printf_wide_c_string): Likewise.
	(printf_pointer): Likewise.
	* probe.c (parse_probes): Likewise.
	* python/py-cmd.c (gdbpy_parse_command_name): Likewise.
	(cmdpy_init): Likewise.
	* python/py-gdb-readline.c (gdbpy_readline_wrapper): Likewise.
	* python/py-symtab.c (set_sal): Likewise.
	* python/py-unwind.c (pyuw_sniffer): Likewise.
	* python/python.c (python_interactive_command): Likewise.
	(compute_python_string): Likewise.
	* ravenscar-thread.c (get_running_thread_id): Likewise.
	* record-full.c (record_full_exec_insn): Likewise.
	(record_full_core_open_1): Likewise.
	* regcache.c (regcache_raw_read_signed): Likewise.
	(regcache_raw_read_unsigned): Likewise.
	(regcache_cooked_read_signed): Likewise.
	(regcache_cooked_read_unsigned): Likewise.
	* remote-fileio.c (remote_fileio_func_open): Likewise.
	(remote_fileio_func_rename): Likewise.
	(remote_fileio_func_unlink): Likewise.
	(remote_fileio_func_stat): Likewise.
	(remote_fileio_func_system): Likewise.
	* remote-mips.c (mips_xfer_memory): Likewise.
	(mips_load_srec): Likewise.
	(pmon_end_download): Likewise.
	* remote.c (new_remote_state): Likewise.
	(map_regcache_remote_table): Likewise.
	(remote_register_number_and_offset): Likewise.
	(init_remote_state): Likewise.
	(get_memory_packet_size): Likewise.
	(remote_pass_signals): Likewise.
	(remote_program_signals): Likewise.
	(remote_start_remote): Likewise.
	(remote_check_symbols): Likewise.
	(remote_query_supported): Likewise.
	(extended_remote_attach): Likewise.
	(process_g_packet): Likewise.
	(store_registers_using_G): Likewise.
	(putpkt_binary): Likewise.
	(read_frame): Likewise.
	(compare_sections_command): Likewise.
	(remote_hostio_pread): Likewise.
	(remote_hostio_readlink): Likewise.
	(remote_file_put): Likewise.
	(remote_file_get): Likewise.
	(remote_pid_to_exec_file): Likewise.
	(_initialize_remote): Likewise.
	* rs6000-aix-tdep.c (rs6000_aix_ld_info_to_xml): Likewise.
	(rs6000_aix_core_xfer_shared_libraries_aix): Likewise.
	* rs6000-tdep.c (ppc_displaced_step_copy_insn): Likewise.
	(bfd_uses_spe_extensions): Likewise.
	* s390-linux-tdep.c (s390_displaced_step_copy_insn): Likewise.
	* score-tdep.c (score7_malloc_and_get_memblock): Likewise.
	* solib-dsbt.c (decode_loadmap): Likewise.
	(fetch_loadmap): Likewise.
	(scan_dyntag): Likewise.
	(enable_break): Likewise.
	(dsbt_relocate_main_executable): Likewise.
	* solib-frv.c (fetch_loadmap): Likewise.
	(enable_break2): Likewise.
	(frv_relocate_main_executable): Likewise.
	* solib-spu.c (spu_relocate_main_executable): Likewise.
	(spu_bfd_open): Likewise.
	* solib-svr4.c (lm_info_read): Likewise.
	(read_program_header): Likewise.
	(find_program_interpreter): Likewise.
	(scan_dyntag): Likewise.
	(elf_locate_base): Likewise.
	(open_symbol_file_object): Likewise.
	(read_program_headers_from_bfd): Likewise.
	(svr4_relocate_main_executable): Likewise.
	* solib-target.c (solib_target_relocate_section_addresses): Likewise.
	* solib.c (solib_find_1): Likewise.
	(exec_file_find): Likewise.
	(solib_find): Likewise.
	* source.c (openp): Likewise.
	(print_source_lines_base): Likewise.
	(forward_search_command): Likewise.
	* sparc-ravenscar-thread.c (supply_register_at_address): Likewise.
	* spu-tdep.c (spu2ppu_prev_register): Likewise.
	(spu_get_overlay_table): Likewise.
	* stabsread.c (patch_block_stabs): Likewise.
	(define_symbol): Likewise.
	(again:): Likewise.
	(read_member_functions): Likewise.
	(read_one_struct_field): Likewise.
	(read_enum_type): Likewise.
	(common_block_start): Likewise.
	* stack.c (read_frame_arg): Likewise.
	(backtrace_command): Likewise.
	* stap-probe.c (stap_parse_register_operand): Likewise.
	* symfile.c (syms_from_objfile_1): Likewise.
	(find_separate_debug_file): Likewise.
	(load_command): Likewise.
	(load_progress): Likewise.
	(load_section_callback): Likewise.
	(reread_symbols): Likewise.
	(add_filename_language): Likewise.
	(allocate_compunit_symtab): Likewise.
	(read_target_long_array): Likewise.
	(simple_read_overlay_table): Likewise.
	* symtab.c (symbol_set_names): Likewise.
	(resize_symbol_cache): Likewise.
	(rbreak_command): Likewise.
	(completion_list_add_name): Likewise.
	(completion_list_objc_symbol): Likewise.
	(add_filename_to_list): Likewise.
	* target-descriptions.c (maint_print_c_tdesc_cmd): Likewise.
	* target-memory.c (target_write_memory_blocks): Likewise.
	* target.c (target_read_string): Likewise.
	(read_whatever_is_readable): Likewise.
	(target_read_alloc_1): Likewise.
	(simple_search_memory): Likewise.
	(target_fileio_read_alloc_1): Likewise.
	* tilegx-tdep.c (tilegx_push_dummy_call): Likewise.
	* top.c (command_line_input): Likewise.
	* tracefile-tfile.c (tfile_fetch_registers): Likewise.
	* tracefile.c (tracefile_fetch_registers): Likewise.
	* tracepoint.c (add_memrange): Likewise.
	(init_collection_list): Likewise.
	(add_aexpr): Likewise.
	(trace_dump_actions): Likewise.
	(parse_trace_status): Likewise.
	(parse_tracepoint_definition): Likewise.
	(parse_tsv_definition): Likewise.
	(parse_static_tracepoint_marker_definition): Likewise.
	* tui/tui-file.c (tui_sfileopen): Likewise.
	(tui_file_adjust_strbuf): Likewise.
	* tui/tui-io.c (tui_expand_tabs): Likewise.
	* tui/tui-source.c (tui_set_source_content): Likewise.
	* typeprint.c (find_global_typedef): Likewise.
	* ui-file.c (do_ui_file_xstrdup): Likewise.
	(ui_file_obsavestring): Likewise.
	(mem_file_write): Likewise.
	* utils.c (make_hex_string): Likewise.
	(get_regcomp_error): Likewise.
	(puts_filtered_tabular): Likewise.
	(gdb_realpath_keepfile): Likewise.
	(ldirname): Likewise.
	(gdb_bfd_errmsg): Likewise.
	(substitute_path_component): Likewise.
	* valops.c (search_struct_method): Likewise.
	(find_oload_champ_namespace_loop): Likewise.
	* valprint.c (print_decimal_chars): Likewise.
	(read_string): Likewise.
	(generic_emit_char): Likewise.
	* varobj.c (varobj_delete): Likewise.
	(varobj_value_get_print_value): Likewise.
	* vaxobsd-tdep.c (vaxobsd_sigtramp_sniffer): Likewise.
	* windows-tdep.c (display_one_tib): Likewise.
	* xcoffread.c (read_xcoff_symtab): Likewise.
	(process_xcoff_symbol): Likewise.
	(swap_sym): Likewise.
	(scan_xcoff_symtab): Likewise.
	(xcoff_initial_scan): Likewise.
	* xml-support.c (gdb_xml_end_element): Likewise.
	(xml_process_xincludes): Likewise.
	(xml_fetch_content_from_file): Likewise.
	* xml-syscall.c (xml_list_of_syscalls): Likewise.
	* xstormy16-tdep.c (xstormy16_push_dummy_call): Likewise.

gdb/gdbserver/ChangeLog:

	* ax.c (gdb_parse_agent_expr): Add cast to allocation result
	assignment.
	(gdb_unparse_agent_expr): Likewise.
	* hostio.c (require_data): Likewise.
	(handle_pread): Likewise.
	* linux-low.c (disable_regset): Likewise.
	(fetch_register): Likewise.
	(store_register): Likewise.
	(get_dynamic): Likewise.
	(linux_qxfer_libraries_svr4): Likewise.
	* mem-break.c (delete_fast_tracepoint_jump): Likewise.
	(set_fast_tracepoint_jump): Likewise.
	(uninsert_fast_tracepoint_jumps_at): Likewise.
	(reinsert_fast_tracepoint_jumps_at): Likewise.
	(validate_inserted_breakpoint): Likewise.
	(clone_agent_expr): Likewise.
	* regcache.c (init_register_cache): Likewise.
	* remote-utils.c (putpkt_binary_1): Likewise.
	(decode_M_packet): Likewise.
	(decode_X_packet): Likewise.
	(look_up_one_symbol): Likewise.
	(relocate_instruction): Likewise.
	(monitor_output): Likewise.
	* server.c (handle_search_memory): Likewise.
	(handle_qxfer_exec_file): Likewise.
	(handle_qxfer_libraries): Likewise.
	(handle_qxfer): Likewise.
	(handle_query): Likewise.
	(handle_v_cont): Likewise.
	(handle_v_run): Likewise.
	(captured_main): Likewise.
	* target.c (write_inferior_memory): Likewise.
	* thread-db.c (try_thread_db_load_from_dir): Likewise.
	* tracepoint.c (init_trace_buffer): Likewise.
	(add_tracepoint_action): Likewise.
	(add_traceframe): Likewise.
	(add_traceframe_block): Likewise.
	(cmd_qtdpsrc): Likewise.
	(cmd_qtdv): Likewise.
	(cmd_qtstatus): Likewise.
	(response_source): Likewise.
	(response_tsv): Likewise.
	(cmd_qtnotes): Likewise.
	(gdb_collect): Likewise.
	(initialize_tracepoint): Likewise.
2015-09-25 14:08:06 -04:00
Yao Qi dd2e65cc2c Call target_can_download_tracepoint if there are tracepoints to download
Nowadays, GDB calls target_can_download_tracepoint at the entry of
download_tracepoint_locations, which is called by.
update_global_location_list.  Sometimes, it is not needed to call
target_can_download_tracepoint at all because there is no tracepoint
created.  In remote target, target_can_download_tracepoint send
qTStatus to the remote in order to know whether tracepoint can be
downloaded or not.  This means some redundant qTStatus packets are
sent.

This patch is to teach GDB to call target_can_download_tracepoint
lazily, only on the moment there are tracepoint to download.
gdb.perf/single-step.exp (with a local patch to measure RSP packets)
shows the number of RSP packets is reduced because there is no
tracepoint at all, so GDB doesn't send qTStatus any more.

                       # of RSP packets
                       original  patched
single-step rsp 1000   7000      6000
single-step rsp 2000   14000     12000
single-step rsp 3000   21000     18000
single-step rsp 4000   28000     24000

gdb:

2015-09-10  Yao Qi  <yao.qi@linaro.org>

	* breakpoint.c (download_tracepoint_locations): New local
	can_download_tracepoint.  Check the result of
	target_can_download_tracepoint and save it in
	can_download_tracepoint if there are tracepoints to download.
	* linux-nat.h (enum tribool): Move it to ...
	* common/common-types.h: ... here.
2015-09-10 12:31:36 +01:00
Pedro Alves cfc3163382 Convert the until/advance commands to thread_fsm mechanism
gdb/ChangeLog:
2015-09-09  Pedro Alves  <palves@redhat.com>

	* breakpoint.c: Include "thread-fsm.h".
	(struct until_break_command_continuation_args): Delete.
	(struct until_break_fsm): New.
	(until_break_fsm_ops): New global.
	(new_until_break_fsm, until_break_fsm_should_stop): New functions.
	(until_break_command_continuation): Delete.
	(until_break_fsm_clean_up): New function.
	(until_break_fsm_async_reply_reason): New function.
	(until_break_command): Adjust to create an until_break_fsm instead
	of a continuation.
	(momentary_bkpt_print_it): No longer print MI's async-stop-reason
	here.
	* infcmd.c (struct until_next_fsm): New.
	(until_next_fsm_ops): New global.
	(new_until_next_fsm, until_next_fsm_should_stop): New function.
	(until_next_continuation): Delete.
	(until_next_fsm_clean_up, until_next_fsm_async_reply_reason): New
	functions.
	(until_next_command): Adjust to create a new until_next_fsm
	instead of a continuation.
2015-09-09 18:24:56 +01:00
Pedro Alves 243a925328 Replace "struct continuation" mechanism by something more extensible
This adds an object oriented replacement for the "struct continuation"
mechanism, and converts the stepping commands (step, next, stepi,
nexti) and the "finish" commands to use it.

It adds a new thread "class" (struct thread_fsm) that contains the
necessary info and callbacks to manage the state machine of a thread's
execution command.

This allows getting rid of some hacks.  E.g., in fetch_inferior_event
and normal_stop we no longer need to know whether a thread is doing a
multi-step (e.g., step N).  This effectively makes the
intermediate_continuations unused -- they'll be garbage collected in a
separate patch.  (They were never a proper abstraction, IMO.  See how
fetch_inferior_event needs to check step_multi before knowing whether
to call INF_EXEC_CONTINUE or INF_EXEC_COMPLETE.)

The target async vs !async uiout hacks in mi_on_normal_stop go away
too.

print_stop_event is no longer called from normal_stop.  Instead it is
now called from within each interpreter's normal_stop observer.  This
clears the path to make each interpreter print a stop event the way it
sees fit.  Currently we have some hacks in common code to
differenciate CLI vs TUI vs MI around this area.

The "finish" command's FSM class stores the return value plus that
value's position in the value history, so that those can be printed to
both MI and CLI's streams.  This fixes the CLI "finish" command when
run from MI -- it now also includes the function's return value in the
CLI stream:

  (gdb)
  ~"callee3 (strarg=0x400730 \"A string argument.\") at src/gdb/testsuite/gdb.mi/basics.c:35\n"
  ~"35\t}\n"
 +~"Value returned is $1 = 0\n"
  *stopped,reason="function-finished",frame=...,gdb-result-var="$1",return-value="0",thread-id="1",stopped-threads="all",core="0"
 -FAIL: gdb.mi/mi-cli.exp: CLI finish: check CLI output
 +PASS: gdb.mi/mi-cli.exp: CLI finish: check CLI output

gdb/ChangeLog:
2015-09-09  Pedro Alves  <palves@redhat.com>

	* Makefile.in (COMMON_OBS): Add thread-fsm.o.
	* breakpoint.c (handle_jit_event): Print debug output.
	(bpstat_what): Split event callback handling to ...
	(bpstat_run_callbacks): ... this new function.
	(momentary_bkpt_print_it): No longer handle bp_finish here.
	* breakpoint.h (bpstat_run_callbacks): Declare.
	* gdbthread.h (struct thread_info) <step_multi>: Delete field.
	<thread_fsm>: New field.
	(thread_cancel_execution_command): Declare.
	* infcmd.c: Include thread-fsm.h.
	(struct step_command_fsm): New.
	(step_command_fsm_ops): New global.
	(new_step_command_fsm, step_command_fsm_prepare): New functions.
	(step_1): Adjust to use step_command_fsm_prepare and
	prepare_one_step.
	(struct step_1_continuation_args): Delete.
	(step_1_continuation): Delete.
	(step_command_fsm_should_stop): New function.
	(step_once): Delete.
	(step_command_fsm_clean_up, step_command_fsm_async_reply_reason)
	(prepare_one_step): New function, based on step_once.
	(until_next_command): Remove step_multi reference.
	(struct return_value_info): New.
	(print_return_value): Rename to ...
	(print_return_value_1): ... this.  New struct return_value_info
	parameter.  Adjust.
	(print_return_value): Reimplement as wrapper around
	print_return_value_1.
	(struct finish_command_fsm): New.
	(finish_command_continuation): Delete.
	(finish_command_fsm_ops): New global.
	(new_finish_command_fsm, finish_command_fsm_should_stop): New
	functions.
	(finish_command_fsm_clean_up, finish_command_fsm_return_value):
	New.
	(finish_command_continuation_free_arg): Delete.
	(finish_command_fsm_async_reply_reason): New.
	(finish_backward, finish_forward): Change symbol parameter to a
	finish_command_fsm.  Adjust.
	(finish_command): Create a finish_command_fsm.  Adjust.
	* infrun.c: Include "thread-fsm.h".
	(clear_proceed_status_thread): Delete the thread's FSM.
	(infrun_thread_stop_requested_callback): Cancel the thread's
	execution command.
	(clean_up_just_stopped_threads_fsms): New function.
	(fetch_inferior_event): Handle the event_thread's should_stop
	method saying the command isn't done yet.
	(process_event_stop_test): Run breakpoint callbacks here.
	(print_stop_event): Rename to ...
	(print_stop_location): ... this.
	(restore_current_uiout_cleanup): New function.
	(print_stop_event): Reimplement.
	(normal_stop): No longer notify the end_stepping_range observers
	here handle "step N" nor "finish" here.  No longer call
	print_stop_event here.
	* infrun.h (struct return_value_info): Forward declare.
	(print_return_value): Declare.
	(print_stop_event): Change prototype.
	* thread-fsm.c: New file.
	* thread-fsm.h: New file.
	* thread.c: Include "thread-fsm.h".
	(thread_cancel_execution_command): New function.
	(clear_thread_inferior_resources): Call it.
	* cli/cli-interp.c (cli_on_normal_stop): New function.
	(cli_interpreter_init): Install cli_on_normal_stop as normal_stop
	observer.
	* mi/mi-interp.c: Include "thread-fsm.h".
	(restore_current_uiout_cleanup): Delete.
	(mi_on_normal_stop): If the thread has an FSM associated, and it
	finished, ask it for the async-reply-reason to print.  Always call
	print_stop_event here, regardless of the top-level interpreter.
	Check bpstat_what to tell whether an asynchronous breakpoint hit
	triggered.
	* tui/tui-interp.c (tui_on_normal_stop): New function.
	(tui_init): Install tui_on_normal_stop as normal_stop observer.

gdb/testsuite/ChangeLog:
2015-09-09  Pedro Alves  <palves@redhat.com>

	* gdb.mi/mi-cli.exp: Add CLI finish tests.
2015-09-09 18:24:00 +01:00
Pedro Alves 0b333c5e7d Merge async and sync code paths some more
This patch makes the execution control code use largely the same
mechanisms in both sync- and async-capable targets.  This means using
continuations and use the event loop to react to target events on sync
targets as well.  The trick is to immediately mark infrun's event loop
source after resume instead of calling wait_for_inferior.  Then
fetch_inferior_event is adjusted to do a blocking wait on sync
targets.

Tested on x86_64 Fedora 20, native and gdbserver, with and without
"maint set target-async off".

gdb/ChangeLog:
2015-09-09  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (bpstat_do_actions_1, until_break_command): Don't
	check whether the target can async.
	* inf-loop.c (inferior_event_handler): Only call target_async if
	the target can async.
	* infcall.c: Include top.h and interps.h.
	(run_inferior_call): For the interpreter to sync mode while
	running the infcall.  Call wait_sync_command_done instead of
	wait_for_inferior plus normal_stop.
	* infcmd.c (prepare_execution_command): Don't check whether the
	target can async when running in the foreground.
	(step_1): Delete synchronous case handling.
	(step_once): Always install a continuation, even in sync mode.
	(until_next_command, finish_forward): Don't check whether the
	target can async.
	(attach_command_post_wait, notice_new_inferior): Always install a
	continuation, even in sync mode.
	* infrun.c (mark_infrun_async_event_handler): New function.
	(proceed): In sync mode, mark infrun's event source instead of
	waiting for events here.
	(fetch_inferior_event): If the target can't async, do a blocking
	wait.
	(prepare_to_wait): In sync mode, mark infrun's event source.
	(infrun_async_inferior_event_handler): No longer bail out if the
	target can't async.
	* infrun.h (mark_infrun_async_event_handler): New declaration.
	* linux-nat.c (linux_nat_wait_1): Remove calls to
	set_sigint_trap/clear_sigint_trap.
	(linux_nat_terminal_inferior): No longer check whether the target
	can async.
	* mi/mi-interp.c (mi_on_sync_execution_done): Update and simplify
	comment.
	(mi_execute_command_input_handler): No longer check whether the
	target is async.  Update and simplify comment.
	* target.c (default_target_wait): New function.
	* target.h (struct target_ops) <to_wait>: Now defaults to
	default_target_wait.
	(default_target_wait): Declare.
	* top.c (wait_sync_command_done): New function, factored out from
	...
	(maybe_wait_sync_command_done): ... this.
	* top.h (wait_sync_command_done): Declare.
	* target-delegates.c: Regenerate.
2015-09-09 18:23:23 +01:00
Simon Marchi 8d7493201c Replace some xmalloc-family functions with XNEW-family ones
This patch is part of the make-gdb-buildable-in-C++ effort.  The idea is
to change some calls to the xmalloc family of functions to calls to the
equivalents in the XNEW family.  This avoids adding an explicit cast, so
it keeps the code a bit more readable.  Some of them also map relatively
well to a C++ equivalent (XNEW (struct foo) -> new foo), so it will be
possible to do scripted replacements if needed.

I only changed calls that were obviously allocating memory for one or
multiple "objects".  Allocation of variable sizes (such as strings or
buffer handling) will be for later (and won't use XNEW).

  - xmalloc (sizeof (struct foo)) -> XNEW (struct foo)
  - xmalloc (num * sizeof (struct foo)) -> XNEWVEC (struct foo, num)
  - xcalloc (1, sizeof (struct foo)) -> XCNEW (struct foo)
  - xcalloc (num, sizeof (struct foo)) -> XCNEWVEC (struct foo, num)
  - xrealloc (p, num * sizeof (struct foo) -> XRESIZEVEC (struct foo, p, num)
  - obstack_alloc (ob, sizeof (struct foo)) -> XOBNEW (ob, struct foo)
  - obstack_alloc (ob, num * sizeof (struct foo)) -> XOBNEWVEC (ob, struct foo, num)
  - alloca (sizeof (struct foo)) -> XALLOCA (struct foo)
  - alloca (num * sizeof (struct foo)) -> XALLOCAVEC (struct foo, num)

Some instances of xmalloc followed by memset to zero the buffer were
replaced by XCNEW or XCNEWVEC.

I regtested on x86-64, Ubuntu 14.04, but the patch touches many
architecture-specific files.  For those I'll have to rely on the
buildbot or people complaining that I broke their gdb.

gdb/ChangeLog:

	* aarch64-linux-nat.c (aarch64_add_process): Likewise.
	* aarch64-tdep.c (aarch64_gdbarch_init): Likewise.
	* ada-exp.y (write_ambiguous_var): Likewise.
	* ada-lang.c (resolve_subexp): Likewise.
	(user_select_syms): Likewise.
	(assign_aggregate): Likewise.
	(ada_evaluate_subexp): Likewise.
	(cache_symbol): Likewise.
	* addrmap.c (allocate_key): Likewise.
	(addrmap_create_mutable): Likewise.
	* aix-thread.c (sync_threadlists): Likewise.
	* alpha-tdep.c (alpha_push_dummy_call): Likewise.
	(alpha_gdbarch_init): Likewise.
	* amd64-windows-tdep.c (amd64_windows_push_arguments): Likewise.
	* arm-linux-nat.c (arm_linux_add_process): Likewise.
	* arm-linux-tdep.c (arm_linux_displaced_step_copy_insn): Likewise.
	* arm-tdep.c (push_stack_item): Likewise.
	(arm_displaced_step_copy_insn): Likewise.
	(arm_gdbarch_init): Likewise.
	(_initialize_arm_tdep): Likewise.
	* avr-tdep.c (push_stack_item): Likewise.
	* ax-general.c (new_agent_expr): Likewise.
	* block.c (block_initialize_namespace): Likewise.
	* breakpoint.c (alloc_counted_command_line): Likewise.
	(update_dprintf_command_list): Likewise.
	(parse_breakpoint_sals): Likewise.
	(decode_static_tracepoint_spec): Likewise.
	(until_break_command): Likewise.
	(clear_command): Likewise.
	(update_global_location_list): Likewise.
	(get_breakpoint_objfile_data) Likewise.
	* btrace.c (ftrace_new_function): Likewise.
	(btrace_set_insn_history): Likewise.
	(btrace_set_call_history): Likewise.
	* buildsym.c (add_symbol_to_list): Likewise.
	(record_pending_block): Likewise.
	(start_subfile): Likewise.
	(start_buildsym_compunit): Likewise.
	(push_subfile): Likewise.
	(end_symtab_get_static_block): Likewise.
	(buildsym_init): Likewise.
	* cli/cli-cmds.c (source_command): Likewise.
	* cli/cli-decode.c (add_cmd): Likewise.
	* cli/cli-script.c (build_command_line): Likewise.
	(setup_user_args): Likewise.
	(realloc_body_list): Likewise.
	(process_next_line): Likewise.
	(copy_command_lines): Likewise.
	* cli/cli-setshow.c (do_set_command): Likewise.
	* coff-pe-read.c (read_pe_exported_syms): Likewise.
	* coffread.c (coff_locate_sections): Likewise.
	(coff_symtab_read): Likewise.
	(coff_read_struct_type): Likewise.
	* common/cleanups.c (make_my_cleanup2): Likewise.
	* common/common-exceptions.c (throw_it): Likewise.
	* common/filestuff.c (make_cleanup_close): Likewise.
	* common/format.c (parse_format_string): Likewise.
	* common/queue.h (DEFINE_QUEUE_P): Likewise.
	* compile/compile-object-load.c (munmap_list_add): Likewise.
	(compile_object_load): Likewise.
	* compile/compile-object-run.c (compile_object_run): Likewise.
	* compile/compile.c (append_args): Likewise.
	* corefile.c (specify_exec_file_hook): Likewise.
	* cp-support.c (make_symbol_overload_list): Likewise.
	* cris-tdep.c (push_stack_item): Likewise.
	(cris_gdbarch_init): Likewise.
	* ctf.c (ctf_trace_file_writer_new): Likewise.
	* dbxread.c (init_header_files): Likewise.
	(add_new_header_file): Likewise.
	(init_bincl_list): Likewise.
	(dbx_end_psymtab): Likewise.
	(start_psymtab): Likewise.
	(dbx_end_psymtab): Likewise.
	* dcache.c (dcache_init): Likewise.
	* dictionary.c (dict_create_hashed): Likewise.
	(dict_create_hashed_expandable): Likewise.
	(dict_create_linear): Likewise.
	(dict_create_linear_expandable): Likewise.
	* dtrace-probe.c (dtrace_process_dof_probe): Likewise.
	* dummy-frame.c (register_dummy_frame_dtor): Likewise.
	* dwarf2-frame-tailcall.c (cache_new_ref1): Likewise.
	* dwarf2-frame.c (dwarf2_build_frame_info): Likewise.
	(decode_frame_entry_1): Likewise.
	* dwarf2expr.c (new_dwarf_expr_context): Likewise.
	* dwarf2loc.c (dwarf2_compile_expr_to_ax): Likewise.
	* dwarf2read.c (dwarf2_has_info): Likewise.
	(create_signatured_type_table_from_index): Likewise.
	(dwarf2_read_index): Likewise.
	(dw2_get_file_names_reader): Likewise.
	(create_all_type_units): Likewise.
	(read_cutu_die_from_dwo): Likewise.
	(init_tu_and_read_dwo_dies): Likewise.
	(init_cutu_and_read_dies): Likewise.
	(create_all_comp_units): Likewise.
	(queue_comp_unit): Likewise.
	(inherit_abstract_dies): Likewise.
	(read_call_site_scope): Likewise.
	(dwarf2_add_field): Likewise.
	(dwarf2_add_typedef): Likewise.
	(dwarf2_add_member_fn): Likewise.
	(attr_to_dynamic_prop): Likewise.
	(abbrev_table_alloc_abbrev): Likewise.
	(abbrev_table_read_table): Likewise.
	(add_include_dir): Likewise.
	(add_file_name): Likewise.
	(dwarf_decode_line_header): Likewise.
	(dwarf2_const_value_attr): Likewise.
	(dwarf_alloc_block): Likewise.
	(parse_macro_definition): Likewise.
	(set_die_type): Likewise.
	(write_psymtabs_to_index): Likewise.
	(create_cus_from_index): Likewise.
	(dwarf2_create_include_psymtab): Likewise.
	(process_psymtab_comp_unit_reader): Likewise.
	(build_type_psymtab_dependencies): Likewise.
	(read_comp_units_from_section): Likewise.
	(compute_compunit_symtab_includes): Likewise.
	(create_dwo_unit_in_dwp_v1): Likewise.
	(create_dwo_unit_in_dwp_v2): Likewise.
	(read_func_scope): Likewise.
	(process_structure_scope): Likewise.
	(mark_common_block_symbol_computed): Likewise.
	(load_partial_dies): Likewise.
	(dwarf2_symbol_mark_computed): Likewise.
	* elfread.c (elf_symfile_segments): Likewise.
	(elf_read_minimal_symbols): Likewise.
	* environ.c (make_environ): Likewise.
	* eval.c (evaluate_subexp_standard): Likewise.
	* event-loop.c (create_file_handler): Likewise.
	(create_async_signal_handler): Likewise.
	(create_async_event_handler): Likewise.
	(create_timer): Likewise.
	* exec.c (build_section_table): Likewise.
	* fbsd-nat.c (fbsd_remember_child): Likewise.
	* fork-child.c (fork_inferior): Likewise.
	* frv-tdep.c (new_variant): Likewise.
	* gdbarch.sh (gdbarch_alloc): Likewise.
	(append_name): Likewise.
	* gdbtypes.c (rank_function): Likewise.
	(copy_type_recursive): Likewise.
	(add_dyn_prop): Likewise.
	* gnu-nat.c (make_proc): Likewise.
	(make_inf): Likewise.
	(gnu_write_inferior): Likewise.
	* gnu-v3-abi.c (build_gdb_vtable_type): Likewise.
	(build_std_type_info_type): Likewise.
	* guile/scm-param.c (compute_enum_list): Likewise.
	* guile/scm-utils.c (gdbscm_parse_function_args): Likewise.
	* guile/scm-value.c (gdbscm_value_call): Likewise.
	* h8300-tdep.c (h8300_gdbarch_init): Likewise.
	* hppa-tdep.c (hppa_init_objfile_priv_data): Likewise.
	(read_unwind_info): Likewise.
	* ia64-tdep.c (ia64_gdbarch_init): Likewise.
	* infcall.c (dummy_frame_context_saver_setup): Likewise.
	(call_function_by_hand_dummy): Likewise.
	* infcmd.c (step_once): Likewise.
	(finish_forward): Likewise.
	(attach_command): Likewise.
	(notice_new_inferior): Likewise.
	* inferior.c (add_inferior_silent): Likewise.
	* infrun.c (add_displaced_stepping_state): Likewise.
	(save_infcall_control_state): Likewise.
	(save_inferior_ptid): Likewise.
	(_initialize_infrun): Likewise.
	* jit.c (bfd_open_from_target_memory): Likewise.
	(jit_gdbarch_data_init): Likewise.
	* language.c (add_language): Likewise.
	* linespec.c (decode_line_2): Likewise.
	* linux-nat.c (add_to_pid_list): Likewise.
	(add_initial_lwp): Likewise.
	* linux-thread-db.c (add_thread_db_info): Likewise.
	(record_thread): Likewise.
	(info_auto_load_libthread_db): Likewise.
	* m32c-tdep.c (m32c_gdbarch_init): Likewise.
	* m68hc11-tdep.c (m68hc11_gdbarch_init): Likewise.
	* m68k-tdep.c (m68k_gdbarch_init): Likewise.
	* m88k-tdep.c (m88k_analyze_prologue): Likewise.
	* macrocmd.c (macro_define_command): Likewise.
	* macroexp.c (gather_arguments): Likewise.
	* macroscope.c (sal_macro_scope): Likewise.
	* macrotab.c (new_macro_table): Likewise.
	* mdebugread.c (push_parse_stack): Likewise.
	(parse_partial_symbols): Likewise.
	(parse_symbol): Likewise.
	(psymtab_to_symtab_1): Likewise.
	(new_block): Likewise.
	(new_psymtab): Likewise.
	(mdebug_build_psymtabs): Likewise.
	(add_pending): Likewise.
	(elfmdebug_build_psymtabs): Likewise.
	* mep-tdep.c (mep_gdbarch_init): Likewise.
	* mi/mi-main.c (mi_execute_command): Likewise.
	* mi/mi-parse.c (mi_parse_argv): Likewise.
	* minidebug.c (lzma_open): Likewise.
	* minsyms.c (terminate_minimal_symbol_table): Likewise.
	* mips-linux-nat.c (mips_linux_insert_watchpoint): Likewise.
	* mips-tdep.c (mips_gdbarch_init): Likewise.
	* mn10300-tdep.c (mn10300_gdbarch_init): Likewise.
	* msp430-tdep.c (msp430_gdbarch_init): Likewise.
	* mt-tdep.c (mt_registers_info): Likewise.
	* nat/aarch64-linux.c (aarch64_linux_new_thread): Likewise.
	* nat/linux-btrace.c (linux_enable_bts): Likewise.
	(linux_enable_pt): Likewise.
	* nat/linux-osdata.c (linux_xfer_osdata_processes): Likewise.
	(linux_xfer_osdata_processgroups): Likewise.
	* nios2-tdep.c (nios2_gdbarch_init): Likewise.
	* nto-procfs.c (procfs_meminfo): Likewise.
	* objc-lang.c (start_msglist): Likewise.
	(selectors_info): Likewise.
	(classes_info): Likewise.
	(find_methods): Likewise.
	* objfiles.c (allocate_objfile): Likewise.
	(update_section_map): Likewise.
	* osabi.c (gdbarch_register_osabi): Likewise.
	(gdbarch_register_osabi_sniffer): Likewise.
	* parse.c (start_arglist): Likewise.
	* ppc-linux-nat.c (hwdebug_find_thread_points_by_tid): Likewise.
	(hwdebug_insert_point): Likewise.
	* printcmd.c (display_command): Likewise.
	(ui_printf): Likewise.
	* procfs.c (create_procinfo): Likewise.
	(load_syscalls): Likewise.
	(proc_get_LDT_entry): Likewise.
	(proc_update_threads): Likewise.
	* prologue-value.c (make_pv_area): Likewise.
	(pv_area_store): Likewise.
	* psymtab.c (extend_psymbol_list): Likewise.
	(init_psymbol_list): Likewise.
	(allocate_psymtab): Likewise.
	* python/py-inferior.c (add_thread_object): Likewise.
	* python/py-param.c (compute_enum_values): Likewise.
	* python/py-value.c (valpy_call): Likewise.
	* python/py-varobj.c (py_varobj_iter_next): Likewise.
	* python/python.c (ensure_python_env): Likewise.
	* record-btrace.c (record_btrace_start_replaying): Likewise.
	* record-full.c (record_full_reg_alloc): Likewise.
	(record_full_mem_alloc): Likewise.
	(record_full_end_alloc): Likewise.
	(record_full_core_xfer_partial): Likewise.
	* regcache.c (get_thread_arch_aspace_regcache): Likewise.
	* remote-fileio.c (remote_fileio_init_fd_map): Likewise.
	* remote-notif.c (remote_notif_state_allocate): Likewise.
	* remote.c (demand_private_info): Likewise.
	(remote_notif_stop_alloc_reply): Likewise.
	(remote_enable_btrace): Likewise.
	* reverse.c (save_bookmark_command): Likewise.
	* rl78-tdep.c (rl78_gdbarch_init): Likewise.
	* rx-tdep.c (rx_gdbarch_init): Likewise.
	* s390-linux-nat.c (s390_insert_watchpoint): Likewise.
	* ser-go32.c (dos_get_tty_state): Likewise.
	(dos_copy_tty_state): Likewise.
	* ser-mingw.c (ser_windows_open): Likewise.
	(ser_console_wait_handle): Likewise.
	(ser_console_get_tty_state): Likewise.
	(make_pipe_state): Likewise.
	(net_windows_open): Likewise.
	* ser-unix.c (hardwire_get_tty_state): Likewise.
	(hardwire_copy_tty_state): Likewise.
	* solib-aix.c (solib_aix_new_lm_info): Likewise.
	* solib-dsbt.c (dsbt_current_sos): Likewise.
	(dsbt_relocate_main_executable): Likewise.
	* solib-frv.c (frv_current_sos): Likewise.
	(frv_relocate_main_executable): Likewise.
	* solib-spu.c (spu_bfd_fopen): Likewise.
	* solib-svr4.c (lm_info_read): Likewise.
	(svr4_copy_library_list): Likewise.
	(svr4_default_sos): Likewise.
	* source.c (find_source_lines): Likewise.
	(line_info): Likewise.
	(add_substitute_path_rule): Likewise.
	* spu-linux-nat.c (spu_bfd_open): Likewise.
	* spu-tdep.c (info_spu_dma_cmdlist): Likewise.
	* stabsread.c (dbx_lookup_type): Likewise.
	(read_type): Likewise.
	(read_member_functions): Likewise.
	(read_struct_fields): Likewise.
	(read_baseclasses): Likewise.
	(read_args): Likewise.
	(_initialize_stabsread): Likewise.
	* stack.c (func_command): Likewise.
	* stap-probe.c (handle_stap_probe): Likewise.
	* symfile.c (addrs_section_sort): Likewise.
	(addr_info_make_relative): Likewise.
	(load_section_callback): Likewise.
	(add_symbol_file_command): Likewise.
	(init_filename_language_table): Likewise.
	* symtab.c (create_filename_seen_cache): Likewise.
	(sort_search_symbols_remove_dups): Likewise.
	(search_symbols): Likewise.
	* target.c (make_cleanup_restore_target_terminal): Likewise.
	* thread.c (new_thread): Likewise.
	(enable_thread_stack_temporaries): Likewise.
	(make_cleanup_restore_current_thread): Likewise.
	(thread_apply_all_command): Likewise.
	* tic6x-tdep.c (tic6x_gdbarch_init): Likewise.
	* top.c (gdb_readline_wrapper): Likewise.
	* tracefile-tfile.c (tfile_trace_file_writer_new): Likewise.
	* tracepoint.c (trace_find_line_command): Likewise.
	(all_tracepoint_actions_and_cleanup): Likewise.
	(make_cleanup_restore_current_traceframe): Likewise.
	(get_uploaded_tp): Likewise.
	(get_uploaded_tsv): Likewise.
	* tui/tui-data.c (tui_alloc_generic_win_info): Likewise.
	(tui_alloc_win_info): Likewise.
	(tui_alloc_content): Likewise.
	(tui_add_content_elements): Likewise.
	* tui/tui-disasm.c (tui_find_disassembly_address): Likewise.
	(tui_set_disassem_content): Likewise.
	* ui-file.c (ui_file_new): Likewise.
	(stdio_file_new): Likewise.
	(tee_file_new): Likewise.
	* utils.c (make_cleanup_restore_integer): Likewise.
	(add_internal_problem_command): Likewise.
	* v850-tdep.c (v850_gdbarch_init): Likewise.
	* valops.c (find_oload_champ): Likewise.
	* value.c (allocate_value_lazy): Likewise.
	(record_latest_value): Likewise.
	(create_internalvar): Likewise.
	* varobj.c (install_variable): Likewise.
	(new_variable): Likewise.
	(new_root_variable): Likewise.
	(cppush): Likewise.
	(_initialize_varobj): Likewise.
	* windows-nat.c (windows_make_so): Likewise.
	* x86-nat.c (x86_add_process): Likewise.
	* xcoffread.c (arrange_linetable): Likewise.
	(allocate_include_entry): Likewise.
	(process_linenos): Likewise.
	(SYMBOL_DUP): Likewise.
	(xcoff_start_psymtab): Likewise.
	(xcoff_end_psymtab): Likewise.
	* xml-support.c (gdb_xml_parse_attr_ulongest): Likewise.
	* xtensa-tdep.c (xtensa_register_type): Likewise.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.

gdb/gdbserver/ChangeLog:

	* ax.c (gdb_parse_agent_expr): Likewise.
	(compile_bytecodes): Likewise.
	* dll.c (loaded_dll): Likewise.
	* event-loop.c (append_callback_event): Likewise.
	(create_file_handler): Likewise.
	(create_file_event): Likewise.
	* hostio.c (handle_open): Likewise.
	* inferiors.c (add_thread): Likewise.
	(add_process): Likewise.
	* linux-aarch64-low.c (aarch64_linux_new_process): Likewise.
	* linux-arm-low.c (arm_new_process): Likewise.
	(arm_new_thread): Likewise.
	* linux-low.c (add_to_pid_list): Likewise.
	(linux_add_process): Likewise.
	(handle_extended_wait): Likewise.
	(add_lwp): Likewise.
	(enqueue_one_deferred_signal): Likewise.
	(enqueue_pending_signal): Likewise.
	(linux_resume_one_lwp_throw): Likewise.
	(linux_resume_one_thread): Likewise.
	(linux_read_memory): Likewise.
	(linux_write_memory): Likewise.
	* linux-mips-low.c (mips_linux_new_process): Likewise.
	(mips_linux_new_thread): Likewise.
	(mips_add_watchpoint): Likewise.
	* linux-x86-low.c (initialize_low_arch): Likewise.
	* lynx-low.c (lynx_add_process): Likewise.
	* mem-break.c (set_raw_breakpoint_at): Likewise.
	(set_breakpoint): Likewise.
	(add_condition_to_breakpoint): Likewise.
	(add_commands_to_breakpoint): Likewise.
	(clone_agent_expr): Likewise.
	(clone_one_breakpoint): Likewise.
	* regcache.c (new_register_cache): Likewise.
	* remote-utils.c (look_up_one_symbol): Likewise.
	* server.c (queue_stop_reply): Likewise.
	(start_inferior): Likewise.
	(queue_stop_reply_callback): Likewise.
	(handle_target_event): Likewise.
	* spu-low.c (fetch_ppc_memory): Likewise.
	(store_ppc_memory): Likewise.
	* target.c (set_target_ops): Likewise.
	* thread-db.c (thread_db_load_search): Likewise.
	(try_thread_db_load_1): Likewise.
	* tracepoint.c (add_tracepoint): Likewise.
	(add_tracepoint_action): Likewise.
	(create_trace_state_variable): Likewise.
	(cmd_qtdpsrc): Likewise.
	(cmd_qtro): Likewise.
	(add_while_stepping_state): Likewise.
	* win32-low.c (child_add_thread): Likewise.
	(get_image_name): Likewise.
2015-08-26 17:18:12 -04:00
Keith Seitz 6799407467 Mass rename `explicit' -> `explicit_loc'.
BuildBot reminded me that "explicit" is a reserved keyword in C++.
This patch simply renames all the (illegal) uses of "explicit". This should
fix the build errors with --enable-build-with-cxx bots.

gdb/ChangeLog

	* break-catch-throw.c (re_set_exception_catchpoint) Rename
	reserved C++ keyword "explicit" to "explicit_loc".
	* breakpoint.c (create_overlay_event_breakpoint)
	(create_longjmp_master_breakpoint)
	(create_std_terminate_master_breakpoint)
	(create_exception_master_breakpoint, update_static_tracepoint):
	Rename reserved C++ keyword "explicit" to "explicit_loc".
	* completer.c (collect_explicit_location_matches)
	(explicit_location_completer): Rename reserved C++ keyword
	"explicit" to "explicit_loc".
	* linespec.c (struct linespec) <explicit>: Rename to "explicit_loc".
	(canonicalize_linespec, create_sals_line_offset)
	(convert_linespec_to_sals, convert_explicit_location_to_sals)
	(event_location_to_sals, decode_objc): Rename reserved C++ keyword
	"explicit" to "explicit_loc".
	* location.c (struct event_location) <explicit>: Rename to
	"explicit_loc".
	(initialize_explicit_location, new_explicit_location)
	(explicit_location_to_string_internal, explicit_location_to_linespec):
	Rename reserved C++ keyword "explicit" to "explicit_loc".
	* location.h (explicit_location_to_string)
	(explicit_location_to_linespec, initialize_explicit_location)
	(new_explicit_location): Rename reserved C++ keyword "explicit"
	to "explicit_loc".
	* mi/mi-cmd-break.c (mi_cmd_break_insert_1): Rename reserved C++
	keyword "explicit" to "explicit_loc".
2015-08-13 09:48:12 -07:00
Luis Machado 244558af86 [regression] Do not read from catchpoint/watchpoint locations' addresses when checking for a permanent breakpoint
While running bare-metal tests with GDB i noticed some failures in
gdb.base/break.exp, related to the use of the catch commands.

It turns out GDB tries to access memory address 0x0 whenever one tries
to insert a catchpoint, which should obviously not happen.

This was introduced with the changes for permanent breakpoints. In special,
bp_loc_is_permanent tries to check if there is a breakpoint inserted at
the same address as the current breakpoint's location's address. In the
case of catchpoints, this is 0x0.

(top-gdb) catch fork
Sending packet: $m0,1#fa...Packet received: E01
Catchpoint 4 (fork)

(top-gdb) catch vfork
Sending packet: $m0,1#fa...Packet received: E01
Catchpoint 5 (vfork)

It is not obvious to detect because this fails silently for Linux. For our
bare-metal testing, though, this fails with a clear error message from the
target about not being able to read such address.

The attached patch addresses this by bailing out of bp_loc_is_permanent (...)
if the location address is not meaningful. I also took the opportunity to
update the comment for breakpoint_address_is_meaningful, which mentioned
breakpoint addresses as opposed to their locations' addresses.

gdb/ChangeLog:

2015-08-11  Luis Machado  <lgustavo@codesourcery.com>

	* breakpoint.c (bp_loc_is_permanent): Return 0 when breakpoint
	location address is not meaningful.
	(breakpoint_address_is_meaningful): Update comment.
2015-08-12 05:36:09 -03:00
Keith Seitz 629500fae6 Explicit locations: documentation updates
This patch adds documentation for explicit locations to both the
User Manual and gdb's online help system.

gdb/ChangeLog:

	* NEWS: Mention explicit locations.
	* breakpoint.c [LOCATION_HELP_STRING]: New macro.
	[BREAK_ARGS_HELP]: Use LOCATION_HELP_STRING.
	(_initialize_breakpoint): Update documentation for
	"clear", "break", "trace", "strace", "ftrace", and "dprintf".

gdb/doc/ChangeLog:

	* gdb.texinfo (Thread-Specific Breakpoints, Printing Source Lines):
	Use "location(s)"instead of "linespec(s)".
	(Specifying a Location): Rewrite.
	Add subsections describing linespec, address, and explicit locations.
	Add node/menu for each subsection.
	(Source and Machine Code, C Preprocessor Macros)
	(Create and Delete Trace points)
	(Extensions for Ada Tasks): Use "location(s)" instead of "linespec(s)".
	(Continuing at a Different Address): Remove "linespec" examples.
	Add reference to "Specify a Location"
	(The -break-insert Command): Rewrite.  Add anchor.
	Add reference to appropriate manual section discussing locations.
	(The -dprintf-insert Command): Refer to -break-insert for
	specification of 'location'.

gdb/testsuite/ChangeLog:

	* gdb.base/help.exp: Update help_breakpoint_text.
2015-08-11 17:09:36 -07:00
Keith Seitz 00e52e5376 Explicit locations: introduce explicit locations
This patch add support for explicit locations and switches many linespec
locations to this new location type.  This patch also converts all
linespec locations entered by the user to an explicit representation
internally (thus bypassing the linespec parser when resetting the
breakpoint).

This patch does not introduce any user-visible changes.


gdb/ChangeLog:

	* break-catch-throw.c (re_set_exception_catchpoint): Convert
	linespec into explicit location.
	* breakpoint.c (create_overlay_breakpoint)
	(create_longjmp_master_breakpoint)
	(create_std_terminate_master_breakpoint)
	(create_exception_master_breakpoint): Convert linespec into explicit
	location.
	(update_static_tracepoint): Convert linespec into explicit location.
	* linespec.c (enum offset_relative_sign, struct line_offset): Move
	location.h.
	(struct linespec) <expression, expr_pc, source_filename>
	<function_name, label_name, line_offset>: Replace with ...
	<explicit>: ... this.
	<is_linespec>: New member.
	(PARSER_EXPLICIT): New accessor macro.
	(undefined_label_error): New function.
	(source_file_not_found_error): New function.
	(linespec_parse_basic): The parser result is now an explicit location.
	Use PARSER_EXPLICIT to access it.
	Use undefined_label_error.
	(canonicalize_linespec): Convert canonical linespec into explicit
	location.
	Move string representation of location to explicit_location_to_linespec
	and use it and explicit_location_to_string to save string
	representations of the canonical location.
	(create_sals_line_offset, convert_linespec_to_sals): `ls' contains an
	explicit location.  Update all references.
	(convert_explicit_location_to_sals): New function.
	(parse_linespec): Use PARSER_EXPLICIT to access the parser
	result's explicit location.
	(linespec_state_constructor): Initialize is_linespec.
	Use PARSER_EXPLICIT.
	(linespec_parser_delete): Use PARSER_EXPLICIT to access the parser's
	result.
	(event_location_to_sals): For linespec locations, set is_linespec.
	Handle explicit locations.
	(decode_objc): 'ls' contains an explicit location now. Update all
	references.
	(symtabs_from_filename): Use source_file_not_found_error.
	* location.c (struct event_location.u) <explicit>: New member.
	(initialize_explicit_location): New function.
	(initialize_event_location): Initialize explicit locations.
	(new_explicit_location, get_explicit_location)
	(get_explicit_location_const): New functions.
	(explicit_to_string_internal): New function; most of contents moved
	from canonicalize_linespec.
	(explicit_location_to_string): New function.
	(explicit_location_to_linespec): New function.
	(copy_event_location, delete_event_location)
	(event_location_to_string_const, event_location_empty_p): Handle
	explicit locations.
	* location.h (enum offset_relative_sign, struct line_offset): Move
	here from linespec.h.
	(enum event_location_type): Add EXPLICIT_LOCATION.
	(struct explicit_location): New structure.
	(explicit_location_to_string): Declare.
	(explicit_location_to_linespec): Declare.
	(new_explicit_location, get_explicit_locationp
	(get_explicit_location_const, initialize_explicit_location): Declare.
2015-08-11 17:09:35 -07:00
Keith Seitz 5b56227bdc Explicit locations: introduce probe locations
This patch adds support for probe locations and converts existing
probe linespec locations to the new location type.

gdb/ChangeLog:

	* break-catch-throw.c (re_set_exception_catchpoint): Convert
	linespec for stap probe to probe location.
	* breakpoint.c (create_longjmp_master_breakpoint)
	(create_exception_master_breakpoint): Likewise.
	(break_command_1): Remove local variable `arg_cp'.
	Check location type to set appropriate breakpoint ops methods.
	(trace_command): Likewise.
	* linespec.c (event_location_to_sals): Assert on probe locations.
	* location.c (EL_PROBE): Add macro definition.
	(new_probe_location, get_probe_location): New functions.
	(copy_event_location, delete_event_location, event_location_to_string)
	(string_to_event_location, event_location_empty_p): Handle probe
	locations.
	* location.h (enum event_location_type): Add PROBE_LOCATION.
	(new_probe_location, get_probe_location): Declare.
	* probe.c (parse_probes): Assert that LOCATION is a probe location.
	Convert linespec into probe location.
2015-08-11 17:09:35 -07:00
Keith Seitz a06efdd6ef Explicit locations: introduce address locations
This patch adds support for address locations, of the form "*ADDR".
[Support for address linespecs has been removed/replaced by this "new"
location type.] This patch also converts any existing address locations
from its previous linespec type.

gdb/ChangeLog:

	* breakpoint.c (create_thread_event_breakpoint, init_breakpoint_sal):
	Convert linespec to address location.
	* linespec.c (canonicalize_linespec): Do not handle address
	locations here.
	(convert_address_location_to_sals): New function; contents moved
	from ...
	(convert_linespc_to_sals): ... here.
	(parse_linespec): Remove address locations from linespec grammar.
	Remove handling of address locations.
	(linespec_lex_to_end): Remove handling of address linespecs.
	(event_location_to_sals): Handle ADDRESS_LOCATION.
	(linespec_expression_to_pc): Export.
	* linespec.h (linespec_expression_to_pc): Add declaration.
	* location.c (struct event_location.u) <address>: New member.
	(new_address_location, get_address_location): New functions.
	(copy_event_location, delete_event_location, event_location_to_string)
	(string_to_event_location, event_location_empty_p): Handle address
	locations.
	* location.h (enum event_location_type): Add ADDRESS_LOCATION.
	(new_address_location, get_address_location): Declare.
	* python/py-finishbreakpoint.c (bpfinishpy_init): Convert linespec
	to address location.
	* spu-tdep.c (spu_catch_start): Likewise.
2015-08-11 17:09:35 -07:00
Keith Seitz f00aae0f7b Explicit locations: use new location API
This patch converts the code base to use the new struct event_location
API being introduced. This patch preserves the current functionality and
adds no new features.

The "big picture" API usage introduced by this patch may be illustrated
with a simple exmaple. Where previously developers would write:

void
my_command (char *arg, int from_tty)
{
   create_breakpoint (..., arg, ...);
   ...
}

one now uses:

void
my_command (char *arg, int from_tty)
{
   struct event_locaiton *location;
   struct cleanup *back_to;

   location = string_to_event_locaiton (&arg, ...);
   back_to = make_cleanup_delete_event_location (location);
   create_breakpoint (..., location, ...);
   do_cleanups (back_to);
}

Linespec-decoding functions (now called location-decoding) such as
decode_line_full no longer skip argument pointers over processed input.
That functionality has been moved into string_to_event_location as
demonstrated above.

gdb/ChangeLog

	* ax-gdb.c: Include location.h.
	(agent_command_1) Use linespec location instead of address
	string.
	* break-catch-throw.c: Include location.h.
	(re_set_exception_catchpoint): Use linespec locations instead
	of address strings.
	* breakpoint.c: Include location.h.
	(create_overlay_event_breakpoint, create_longjmp_master_breakpoint)
	(create_std_terminate_master_breakpoint)
	(create_exception_master_breakpoint, update_breakpoints_after_exec):
	Use linespec location instead of address string.
	(print_breakpoint_location):  Use locations and
	event_location_to_string.
	Print extra_string for pending locations for non-MI streams.
	(print_one_breakpoint_location): Use locations and
	event_location_to_string.
	(init_raw_breakpoint_without_location): Initialize b->location.
	(create_thread_event_breakpoint): Use linespec location instead of
	address string.
	(init_breakpoint_sal): Likewise.
	Only save extra_string if it is non-NULL and not the empty string.
	Use event_location_to_string instead of `addr_string'.
	Constify `p' and `endp'.
	Use skip_spaces_const/skip_space_const instead of non-const versions.
	Copy the location into the breakpoint.
	If LOCATION is NULL, save the breakpoint address as a linespec location
	instead of an address string.
	(create_breakpoint_sal): Change `addr_string' parameter to a struct
	event_location. All uses updated.
	(create_breakpoints_sal): Likewise for local variable `addr_string'.
	(parse_breakpoint_sals): Use locations instead of address strings.
	Remove check for empty linespec with conditional.
	Refactor.
	(decode_static_tracepoint_spec): Make argument const and update
	function.
	(create_breakpoint): Change `arg' to a struct event_location and
	rename.
	Remove `copy_arg' and `addr_start'.
	If EXTRA_STRING is empty, set it to NULL.
	Don't populate `canonical' for pending breakpoints.
	Pass `extra_string' to find_condition_and_thread.
	Clear `extra_string' if `rest' was NULL.
	Do not error with "garbage after location" if setting a dprintf
	breakpoint.
	Copy the location into the breakpoint instead of an address string.
	(break_command_1): Use string_to_event_location and pass this to
	create_breakpoint instead of an address string.
	Check against `arg_cp' for a probe linespec.
	(dprintf_command): Use string_to_event_location and pass this to
	create_breakpoint instead of an address string.
	Throw an exception if no format string was specified.
	(print_recreate_ranged_breakpoint): Use event_location_to_string
	instead of address strings.
	(break_range_command, until_break_command)
	(init_ada_exception_breakpoint): Use locations instead
	of address strings.
	(say_where): Print out extra_string for pending locations.
	(base_breakpoint_dtor): Delete `location' and `location_range_end' of
	the breakpoint.
	(base_breakpoint_create_sals_from_location): Use struct event_location
	instead of address string.
	Remove `addr_start' and `copy_arg' parameters.
	(base_breakpoint_decode_location): Use struct event_location instead of
	address string.
	(bkpt_re_set): Use locations instead of address strings.
	Use event_location_empty_p to check for unset location.
	(bkpt_print_recreate): Use event_location_to_string instead of
	an address string.
	Print out extra_string for pending locations.
	(bkpt_create_sals_from_location, bkpt_decode_location)
 	(bkpt_probe_create_sals_from_location): Use struct event_location
	instead of address string.
	(bkpt_probe_decode_location): Use struct event_location instead of
	address string.
	(tracepoint_print_recreate): Use event_location_to_string to
	recreate the tracepoint.
	(tracepoint_create_sals_from_location, tracepoint_decode_location)
	(tracepoint_probe_create_sals_from_location)
	(tracepoint_probe_decode_location): Use struct event_location
	instead of address string.
	(dprintf_print_recreate): Use event_location_to_string to recreate
	the dprintf.
	(dprintf_re_set): Remove check for valid/missing format string.
	(strace_marker_create_sals_from_location)
	(strace_marker_create_breakpoints_sal, strace_marker_decode_location)
	(update_static_tracepoint): Use struct event_location instead of
	address string.
	(location_to_sals): Likewise.
	Pass `extra_string' to find_condition_and_thread.
	For newly resolved pending breakpoint locations, clear the location's
	string representation.
	Assert that the breakpoint's condition string is NULL when
	condition_not_parsed.
	(breakpoint_re_set_default, create_sals_from_location_default)
	(decode_location_default, trace_command, ftrace_command)
	(strace_command, create_tracepoint_from_upload): Use locations
	instead of address strings.
	* breakpoint.h (struct breakpoint_ops) <create_sals_from_location>:
	Use struct event_location instead of address string.
	Update all uses.
	<decode_location>: Likewise.
	(struct breakpoint) <addr_string>: Change to struct event_location
	and rename `location'.
	<addr_string_range_end>: Change to struct event_location and rename
	`location_range_end'.
	(create_breakpoint): Use struct event_location instead of address
	string.
	* cli/cli-cmds.c: Include location.h.
	(edit_command, list_command): Use locations instead of address strings.
	* elfread.c: Include location.h.
	(elf_gnu_ifunc_resolver_return_stop): Use event_location_to_string.
	* guile/scm-breakpoint.c: Include location.h.
	(bpscm_print_breakpoint_smob): Use event_location_to_string.
	(gdbscm_register_breakpoint): Use locations instead of address
	strings.
	* linespec.c: Include location.h.
	(struct ls_parser) <stream>: Change to const char *.
	(PARSER_STREAM): Update.
	(lionespec_lexer_lex_keyword): According to find_condition_and_thread,
	keywords must be followed by whitespace.
	(canonicalize_linespec): Save a linespec location into `canonical'.
	Save a canonical linespec into `canonical'.
	(parse_linespec): Change `argptr' to const char * and rename `arg'.
	All uses updated.
	Update function description.
	(linespec_parser_new): Initialize `parser'.
	Update initialization of  parsing stream.
	(event_location_to_sals): New function.
	(decode_line_full): Change `argptr' to a struct event_location and
	rename it `location'.
	Use locations instead of address strings.
	Call event_location_to_sals instead of parse_linespec.
	(decode_line_1): Likewise.
	(decode_line_with_current_source, decode_line_with_last_displayed)
	Use locations instead of address strings.
	(decode_objc): Likewise.
	Change `argptr' to const char * and rename `arg'.
	(destroy_linespec_result): Delete the linespec result's location
	instead of freeing the address string.
	* linespec.h (struct linespec_result) <addr_string>: Change to
	struct event_location and rename to ...
	<location>: ... this.
	(decode_line_1, decode_line_full): Change `argptr' to struct
	event_location.  All callers updated.
	* mi/mi-cmd-break.c: Include language.h, location.h, and linespec.h.
	(mi_cmd_break_insert_1): Use locations instead of address strings.
	Throw an error if there was "garbage" at the end of the specified
	linespec.
	* probe.c: Include location.h.
	(parse_probes): Change `argptr' to struct event_location.
	Use event locations instead of address strings.
	* probe.h (parse_probes): Change `argptr' to struct event_location.
	* python/py-breakpoint.c: Include location.h.
	(bppy_get_location): Constify local variable `str'.
	Use event_location_to_string.
	(bppy_init): Use locations instead of address strings.
	* python/py-finishbreakpoint.c: Include location.h.
	(bpfinishpy_init): Remove local variable `addr_str'.
	Use locations instead of address strings.
	* python/python.c: Include location.h.
	(gdbpy_decode_line): Use locations instead of address strings.
	* remote.c: Include location.h.
	(remote_download_tracepoint): Use locations instead of address
	strings.
	* spu-tdep.c: Include location.h.
	(spu_catch_start): Remove local variable `buf'.
	Use locations instead of address strings.
	* tracepoint.c: Include location.h.
	(scope_info): Use locations instead of address strings.
	(encode_source_string): Constify parameter `src'.
	* tracepoint.h (encode_source_string): Likewise.

gdb/testsuite/ChangeLog

	* gdb.base/dprintf-pending.exp: Update dprintf "without format"
	test.
	Add tests for missing ",FMT" and ",".
2015-08-11 17:09:35 -07:00
Keith Seitz 5f700d83f7 Explicit locations: rename "address string"/"addr_string" to "location"
This patch renames all occurrances of "addr_string" and "address
string" in the breakpoint/linespec APIs.  This will emphasize the
change from address strings used in setting breakpoints (et al) to the
new locations-based API introduced in subsequent patches.

gdb/ChangeLog:

	* breakpoint.h (struct breakpoint_ops) <create_sals_from_address>:
	Renamed to create_sals_from_location.
	<decode_linespec>: Renamed to decode_location.
	Update all callers.
	* breakpoint.c (create_sals_from_address_default): Renamed to ...
	(create_sals_from_location_default): ... this.
	(addr_string_to_sals): Renamed to ...
	(location_to_sals): ... this.
	(decode_linespec_default): Renamed to ...
	(decode_location_default): ... this.
	(base_breakpoint_create_sals_from_address): Renamed to ...
	(base_breakpoint_create_sals_from_location): ... this.
	(bkpt_create_sals_from_address): Renamed to ...
	(bkpt_create_sals_from_location): ... this.
	(bkpt_decode_linespec): Renamed to ...
	(bkpt_decode_location): ... this.
	(bkpt_probe_create_sals_from_address): Renamed to ...
	(bkpt_probe_create_sals_from_location): ... this.
	(tracepoint_create_sals_from_address): Renamed to ...
	(tracepoint_create_sals_from_location): ... this.
	(tracepoint_decode_linespec): Renamed to ...
	(tracepoint_decode_location): ... this.
	(tracepoint_probe_create_sals_from_address): Renamed to ...
	(tracepoint_probe_create_sals_from_location): ... this.
	(tracepoint_probe_decode_linespec): Renamed to ...
	(tracepoint_probe_decode_location): ... this.
	(strace_marker_create_sals_from_address): Renamed to ...
	(strace_marker_create_sals_from_location): ... this.
	(decode_linespec_default): Renamed to ...
	(decode_location_default): ... this.
2015-08-11 17:09:35 -07:00
Pedro Alves fbea99ea8a Implement all-stop on top of a target running non-stop mode
This finally implements user-visible all-stop mode running with the
target_ops backend always in non-stop mode.  This is a stepping stone
towards finer-grained control of threads, being able to do interesting
things like thread groups, associating groups with breakpoints, etc.
From the user's perspective, all-stop mode is really just a special
case of being able to stop and resume specific sets of threads, so it
makes sense to do this step first.

With this, even in all-stop, the target is no longer in charge of
stopping all threads before reporting an event to the core -- the core
takes care of it when it sees fit.  For example, when "next"- or
"step"-ing, we can avoid stopping and resuming all threads at each
internal single-step, and instead only stop all threads when we're
about to present the stop to the user.

The implementation is almost straight forward, as the heavy lifting
has been done already in previous patches.  Basically, we replace
checks for "set non-stop on/off" (the non_stop global), with calls to
a new target_is_non_stop_p function.  In a few places, if "set
non-stop off", we stop all threads explicitly, and in a few other
places we resume all threads explicitly, making use of existing
methods that were added for teaching non-stop to step over breakpoints
without displaced stepping.

This adds a new "maint set target-non-stop on/off/auto" knob that
allows both disabling the feature if we find problems, and
force-enable it for development (useful when teaching a target about
this.  The default is "auto", which means the feature is enabled if a
new target method says it should be enabled.  The patch implements the
method in linux-nat.c, just for illustration, because it still returns
false.  We'll need a few follow up fixes before turning it on by
default.  This is a separate target method from indicating regular
non-stop support, because e.g., while e.g., native linux-nat.c is
close to regression free with all-stop-non-stop (with following
patches will fixing the remaining regressions), remote.c+gdbserver
will still need more fixing, even though it supports "set non-stop
on".

Tested on x86_64 Fedora 20, native, with and without "set displaced
off", and with and without "maint set target-non-stop on"; and also
against gdbserver.

gdb/ChangeLog:
2015-08-07  Pedro Alves  <palves@redhat.com>

	* NEWS: Mention "maint set/show target-non-stop".
	* breakpoint.c (update_global_location_list): Check
	target_is_non_stop_p instead of non_stop.
	* infcmd.c (attach_command_post_wait, attach_command): Likewise.
	* infrun.c (show_can_use_displaced_stepping)
	(can_use_displaced_stepping_p, start_step_over_inferior):
	Likewise.
	(internal_resume_ptid): New function.
	(resume): Use it.
	(proceed): Check target_is_non_stop_p instead of non_stop.  If in
	all-stop mode but the target is always in non-stop mode, start all
	the other threads that are implicitly resumed too.
	(for_each_just_stopped_thread, fetch_inferior_event)
	(adjust_pc_after_break, stop_all_threads): Check
	target_is_non_stop_p instead of non_stop.
	(handle_inferior_event): Likewise.  Handle detach-fork in all-stop
	with the target always in non-stop mode.
	(handle_signal_stop) <random signal>: Check target_is_non_stop_p
	instead of non_stop.
	(switch_back_to_stepped_thread): Check target_is_non_stop_p
	instead of non_stop.
	(keep_going_stepped_thread): Use internal_resume_ptid.
	(stop_waiting): If in all-stop mode, and the target is in non-stop
	mode, stop all threads.
	(keep_going_pass): Likewise, when starting a new in-line step-over
	sequence.
	* linux-nat.c (get_pending_status, select_event_lwp)
	(linux_nat_filter_event, linux_nat_wait_1, linux_nat_wait): Check
	target_is_non_stop_p instead of non_stop.
	(linux_nat_always_non_stop_p): New function.
	(linux_nat_stop): Check target_is_non_stop_p instead of non_stop.
	(linux_nat_add_target): Install linux_nat_always_non_stop_p.
	* target-delegates.c: Regenerate.
	* target.c (target_is_non_stop_p): New function.
	(target_non_stop_enabled, target_non_stop_enabled_1): New globals.
	(maint_set_target_non_stop_command)
	(maint_show_target_non_stop_command): New functions.
	(_initilize_target): Install "maint set/show target-non-stop"
	commands.
	* target.h (struct target_ops) <to_always_non_stop_p>: New field.
	(target_non_stop_enabled): New declaration.
	(target_is_non_stop_p): New declaration.

gdb/doc/ChangeLog:
2015-08-07  Pedro Alves  <palves@redhat.com>

	* gdb.texinfo (Maintenance Commands): Document "maint set/show
	target-non-stop".
2015-08-07 17:24:01 +01:00
Pedro Alves 372316f128 Teach non-stop to do in-line step-overs (stop all, step, restart)
That is, step past breakpoints by:

 - pausing all threads
 - removing breakpoint at PC
 - single-step
 - reinsert breakpoint
 - restart threads

similarly to all-stop (with displaced stepping disabled).  This allows
non-stop to work on targets/architectures without displaced stepping
support.  That is, it makes displaced stepping an optimization instead
of a requirement.  For example, in principle, all GNU/Linux ports
support non-stop mode at the target_ops level, but not all
corresponding gdbarch's implement displaced stepping.  This should
make non-stop work for all (albeit, not as efficiently).  And then
there are scenarios where even if the architecture supports displaced
stepping, we can't use it, because we e.g., don't find a usable
address to use as displaced step scratch pad.  It should also fix
stepping past watchpoints on targets that have non-continuable
watchpoints in non-stop mode (e.g., PPC, untested).  Running the
instruction out of line in the displaced stepping scratch pad doesn't
help that case, as the copied instruction reads/writes the same
watched memory...  We can fix that too by teaching GDB to only remove
the watchpoint from the thread that we want to move past the
watchpoint (currently, removing a watchpoint always removes it from
all threads), but again, that can be considered an optimization; not
all targets would support it.

For those familiar with the gdb and gdbserver Linux target_ops
backends, the implementation should look similar, except it is done on
the core side.  When we pause threads, we may find they stop with an
interesting event that should be handled later when the thread is
re-resumed, thus we store such events in the thread object, and mark
the event as pending.  We should only consume pending events if the
thread is indeed resumed, thus we add a new "resumed" flag to the
thread object.  At a later stage, we might add new target methods to
accelerate some of this, like "pause all threads", with corresponding
RSP packets, but we'd still need a fallback method for remote targets
that don't support such packets, so, again, that can be deferred as
optimization.

My _real_ motivation here is making it possible to reimplement
all-stop mode on top of the target always working on non-stop mode, so
that e.g., we can send RSP packets to a remote target even while the
target is running -- can't do that in the all-stop RSP variant, by
design).

Tested on x86_64 Fedora 20, with and without "set displaced off"
forced.  The latter forces the new code paths whenever GDB needs to
step past a breakpoint.

gdb/ChangeLog:
2015-08-07  Pedro Alves  <pedro@codesourcery.com>

	* breakpoint.c (breakpoints_should_be_inserted_now): If any thread
	has a pending status, return true.
	* gdbthread.h: Include target/waitstatus.h.
	(struct thread_suspend_state) <stop_reason, waitstatus_pending_p,
	stop_pc>: New fields.
	(struct thread_info) <resumed>: New field.
	(set_resumed): Declare.
	* infrun.c: Include "event-loop.h".
	(infrun_async_inferior_event_token, infrun_is_async): New globals.
	(infrun_async): New function.
	(clear_step_over_info): Add debug output.
	(displaced_step_in_progress_any_inferior): New function.
	(displaced_step_fixup): New returns int.
	(start_step_over): Handle in-line step-overs too.  Assert the
	thread is marked resumed.
	(resume_cleanups): Clear the thread's resumed flag.
	(resume): Set the thread's resumed flag.  Return early if the
	thread has a pending status.  Allow stepping a breakpoint with no
	signal.
	(proceed): Adjust to check 'resumed' instead of 'executing'.
	(clear_proceed_status_thread): If the thread has a pending status,
	and that status is a finished step, discard the pending status.
	(clear_proceed_status): Don't clear step_over_info here.
	(random_pending_event_thread, do_target_wait): New functions.
	(prepare_for_detach, wait_for_inferior, fetch_inferior_event): Use
	do_target_wait.
	(wait_one): New function.
	(THREAD_STOPPED_BY): New macro.
	(thread_stopped_by_watchpoint, thread_stopped_by_sw_breakpoint)
	(thread_stopped_by_hw_breakpoint): New functions.
	(switch_to_thread_cleanup, save_waitstatus, stop_all_threads): New
	functions.
	(handle_inferior_event): Also call set_resumed(false) on all
	threads implicitly stopped by the event.
	(restart_threads, resumed_thread_with_pending_status): New
	functions.
	(finish_step_over): If we were doing an in-line step-over before,
	and no longer are after trying to start a new step-over, restart
	all threads.  If we have multiple threads with pending events,
	save the current event and go through the event loop again.
	(handle_signal_stop): Return early if finish_step_over returns
	false.
	<random signal>: If we get a signal while stepping over a
	breakpoint in-line in non-stop mode, restart all threads.  Clear
	step_over_info before delivering the signal.
	(keep_going_stepped_thread): Use internal_error instead of
	gdb_assert.  Mark the thread as resumed.
	(keep_going_pass_signal): Assert the thread isn't already resumed.
	If some other thread is doing an in-line step-over, defer the
	resume.  If we just started a new in-line step-over, stop all
	threads.  Don't clear step_over_info.
	(infrun_async_inferior_event_handler): New function.
	(_initialize_infrun): Create async event handler with
	infrun_async_inferior_event_handler as callback.
	(infrun_async): New declaration.
	* target.c (target_async): New function.
	* target.h (target_async): Declare macro and readd as function
	declaration.
	* target/waitstatus.h (enum target_stop_reason)
	<TARGET_STOPPED_BY_SINGLE_STEP>: New value.
	* thread.c (new_thread): Clear the new waitstatus field.
	(set_resumed): New function.
2015-08-07 17:24:00 +01:00
Pedro Alves 0a39bb3218 stepping is disturbed by setjmp/longjmp | try/catch in other threads
At https://sourceware.org/ml/gdb-patches/2015-08/msg00097.html, Joel
observed that trying to next/step a program on GNU/Linux sometimes
results in the following failed assertion:

	% gdb -q .obj/gprof/main
    (gdb) start
    (gdb) n
    (gdb) step
    [...]/infrun.c:2391: internal-error:
    resume: Assertion `sig != GDB_SIGNAL_0' failed.

What happened is that, during the "next" operation, GDB hit a
longjmp/exception/step-resume breakpoint but failed to see that this
breakpoint was set for a different thread than the one being stepped.

Joel's detailed analysis follows:

More precisely, at the end of the "start" command, we are stopped at
the start of function Main in main.adb; there are 4 threads in total,
and we are in the main thread (which is thread 1):

    (gdb) info thread
      Id   Target Id         Frame
      4    Thread 0xb7a56ba0 (LWP 28379) 0xffffe410 in __kernel_vsyscall ()
      3    Thread 0xb7c5aba0 (LWP 28378) 0xffffe410 in __kernel_vsyscall ()
      2    Thread 0xb7e5eba0 (LWP 28377) 0xffffe410 in __kernel_vsyscall ()
    * 1    Thread 0xb7ea18c0 (LWP 28370) main () at /[...]/main.adb:57

All the logs below reference Thread ID/LWP, but it'll be easier to
talk about the threads by GDB thread number.  For instance, thread 1
is LWP 28370 while thread 3 is LWP 28378.  So, the explanations below
translate the LWPs into thread numbers.

Back to what happens while we are trying to "next' our program:
    (gdb) n
    infrun: clear_proceed_status_thread (Thread 0xb7a56ba0 (LWP 28379))
    infrun: clear_proceed_status_thread (Thread 0xb7c5aba0 (LWP 28378))
    infrun: clear_proceed_status_thread (Thread 0xb7e5eba0 (LWP 28377))
    infrun: clear_proceed_status_thread (Thread 0xb7ea18c0 (LWP 28370))
    infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
    infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=0, current thread [Thread 0xb7ea18c0 (LWP 28370)] at 0x805451e
    infrun: target_wait (-1.0.0, status) =
    infrun:   28370.28370.0 [Thread 0xb7ea18c0 (LWP 28370)],
    infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
    infrun: TARGET_WAITKIND_STOPPED
    infrun: stop_pc = 0x8054523

We've resumed thread 1 (LWP 28370), and received in return a signal
that the same thread stopped slightly further.  It's still in the
range of instructions for the line of source we started the "next"
from, as evidenced by the following trace...

    infrun: stepping inside range [0x805451e-0x8054531]

... and thus, we decide to continue stepping the same thread:

    infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=0, current thread [Thread 0xb7ea18c0 (LWP 28370)] at 0x8054523
    infrun: prepare_to_wait

That's when we get an event from a different thread (thread 3)...

    infrun: target_wait (-1.0.0, status) =
    infrun:   28370.28378.0 [Thread 0xb7c5aba0 (LWP 28378)],
    infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
    infrun: TARGET_WAITKIND_STOPPED
    infrun: stop_pc = 0x80782d0
    infrun: context switch
    infrun: Switching context from Thread 0xb7ea18c0 (LWP 28370) to Thread 0xb7c5aba0 (LWP 28378)

... which we find to be at the address where we set a breakpoint on
"the unwinder debug hook" (namely "_Unwind_DebugHook").  But GDB fails
to notice that the breakpoint was inserted for thread 1 only, and so
decides to handle it as...

    infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME

... and inserts a breakpoint at the corresponding resume address, as
evidenced by this the next log:

    infrun: exception resume at 80542a2

That breakpoint seems innocent right now, but will play a role fairly
quickly.  But for now, GDB has inserted the exception-resume
breakpoint, and needs to single-step thread 3 past the breakpoint it
just hit.  Thus, it temporarily disables the exception breakpoint, and
requests a step of that thread:

    infrun: skipping breakpoint: stepping past insn at: 0x80782d0
    infrun: skipping breakpoint: stepping past insn at: 0x80782d0
    infrun: skipping breakpoint: stepping past insn at: 0x80782d0
    infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=1, current thread [Thread 0xb7c5aba0 (LWP 28378)] at 0x80782d0
    infrun: prepare_to_wait

We then get a notification, still from thread 3, that it's now past
that breakpoint...

    infrun: prepare_to_wait
    infrun: target_wait (-1.0.0, status) =
    infrun:   28370.28378.0 [Thread 0xb7c5aba0 (LWP 28378)],
    infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
    infrun: TARGET_WAITKIND_STOPPED
    infrun: stop_pc = 0x8078424

... so we can resume what we were doing before, which is single-stepping
thread 1 until we get to a new line of code:

    infrun: switching back to stepped thread
    infrun: Switching context from Thread 0xb7c5aba0 (LWP 28378) to Thread 0xb7ea18c0 (LWP 28370)
    infrun: expected thread still hasn't advanced
    infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=0, current thread [Thread 0xb7ea18c0 (LWP 28370)] at 0x8054523

The "resume" log above shows that we're resuming thread 1 from where
we left off (0x8054523).  We get one more stop at 0x8054529, which is
still inside our stepping range so we go again.  That's when we get
the following event, from thread 3:

    infrun: prepare_to_wait
    infrun: target_wait (-1.0.0, status) =
    infrun:   28370.28378.0 [Thread 0xb7c5aba0 (LWP 28378)],
    infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
    infrun: TARGET_WAITKIND_STOPPED
    infrun: stop_pc = 0x80542a2

Now the stop_pc address is interesting, because it's the address of
"exception resume" breakpoint...

    infrun: context switch
    infrun: Switching context from Thread 0xb7ea18c0 (LWP 28370) to Thread 0xb7c5aba0 (LWP 28378)
    infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME

... and since that location is at a different line of code, this is
where it decides the "next" operation should stop:

    infrun: stop_waiting
    [Switching to Thread 0xb7c5aba0 (LWP 28378)]
    0x080542a2 in inte_tache_rt.ttache_rt (
        <_task>=0x80968ec <inte_tache_rt_inst.tache2>)
        at /[...]/inte_tache_rt.adb:54
    54            end loop;

However, what GDB should have noticed earlier that the exception
breakpoint we hit was for a different thread, thus should have
single-stepped that thread out of the breakpoint _without_ inserting
the exception-return breakpoint, and then resumed the single-stepping
of the initial thread (thread 1) until that thread stepped out of its
stepping range.

This is what this patch does, and after applying it, GDB now correctly
stops on the next line of code.

The patch adds a C++ test that exercises this, both for setjmp/longjmp
and exception breakpoints.  With an unpatched GDB it shows:

 (gdb) next
 [Switching to Thread 22445.22455]
 thread_try_catch (arg=0x0) at /home/pedro/gdb/mygit/build/../src/gdb/testsuite/gdb.threads/next-other-thr-longjmp.c:59
 59            catch (...)
 (gdb) FAIL: gdb.threads/next-other-thr-longjmp.exp: next to line 1
 next
 /home/pedro/gdb/mygit/build/../src/gdb/infrun.c:4865: internal-error: process_event_stop_test: Assertion `ecs->event_thread->control.exception_resume_breakpoint != NULL' fa
 iled.
 A problem internal to GDB has been detected,
 further debugging may prove unreliable.
 Quit this debugging session? (y or n) FAIL: gdb.threads/next-other-thr-longjmp.exp: next to line 2 (GDB internal error)
 Resyncing due to internal error.
 n

Tested on x86_64-linux, no regressions.

gdb/ChangeLog:
2015-08-05  Pedro Alves  <palves@redhat.com>
	    Joel Brobecker  <brobecker@adacore.com>

        * breakpoint.c (bpstat_what) <bp_longjmp, bp_longjmp_call_dummy>
	<bp_exception, bp_longjmp_resume, bp_exception_resume>: Handle the
	case where BS->STOP is not set.

gdb/testsuite/ChangeLog:
2015-08-05  Pedro Alves  <palves@redhat.com>

	* gdb.threads/next-while-other-thread-longjmps.c: New file.
	* gdb.threads/next-while-other-thread-longjmps.exp: New file.
2015-08-05 20:01:42 +01:00
Simon Marchi f486487f55 Mostly trivial enum fixes
This is a patch I extracted from Pedro's C++ branch.  It contains the
most trivial enum fixes, where an integer type/value was used instead
of the appropriate enum type/value.  It fixes many C++ errors, since
in C++ you can't mix integers and enums implicitely.

Regardless of the C++ conversion, I think this is a good cleanup to make
use of the appropriate enum types.

Regression-tested on native x86_64.

gdb/ChangeLog:

	* aarch64-linux-nat.c (aarch64_linux_can_use_hw_breakpoint): Use enum
	type or value instead of integer.
	(aarch64_linux_insert_watchpoint): Likewise.
	(aarch64_linux_remove_watchpoint): Likewise.
	* ada-lang.c (ada_op_print_tab): Likewise.
	* amd64-linux-tdep.c (amd64_canonicalize_syscall): Likewise.
	(amd64_linux_syscall_record_common): Likewise.
	* arch-utils.c (target_byte_order_user): Likewise.
	(default_byte_order): Likewise.
	* arm-linux-nat.c (arm_linux_can_use_hw_breakpoint): Likewise.
	(arm_linux_get_hwbp_type): Likewise.
	(arm_linux_hw_watchpoint_initialize): Likewise.
	(arm_linux_insert_watchpoint): Likewise.
	* arm-linux-tdep.c (arm_canonicalize_syscall): Likewise.
	(arm_linux_syscall_record): Likewise.
	* breakpoint.c (update_watchpoint): Likewise.
	(breakpoint_here_p): Likewise.
	(bpstat_print): Likewise.
	(enable_breakpoint_disp): Likewise.
	* c-lang.c (c_op_print_tab): Likewise.
	* cli/cli-decode.c (add_info_alias): Likewise.
	* d-lang.c (d_op_print_tab): Likewise.
	* eval.c (evaluate_subexp_standard): Likewise.
	* f-exp.y (dot_ops): Likewise.
	(f77_keywords): Likewise.
	* f-lang.c (f_op_print_tab): Likewise.
	* go-lang.c (go_op_print_tab): Likewise.
	* guile/scm-breakpoint.c (gdbscm_make_breakpoint): Likewise.
	* guile/scm-cmd.c (gdbscm_make_command): Likewise.
	* guile/scm-param.c (gdbscm_make_parameter): Likewise.
	* guile/scm-pretty-print.c (gdbscm_apply_val_pretty_printer): Likewise.
	* guile/scm-string.c (struct scm_to_stringn_data): Likewise.
	(struct scm_from_stringn_data): Likewise.
	* i386-linux-tdep.c (i386_canonicalize_syscall): Likewise.
	* ia64-linux-nat.c (ia64_linux_insert_watchpoint): Likewise.
	(ia64_linux_remove_watchpoint): Likewise.
	(ia64_linux_can_use_hw_breakpoint): Likewise.
	* infrun.c (print_stop_event): Likewise.
	* jv-lang.c (java_op_print_tab): Likewise.
	* linux-nat.c (linux_proc_xfer_partial): Likewise.
	* linux-nat.h (struct lwp_info): Likewise.
	* linux-thread-db.c (enable_thread_event): Likewise.
	* m2-lang.c (m2_op_print_tab): Likewise.
	* mi/mi-cmd-stack.c (mi_cmd_stack_list_locals): Likewise.
	(mi_cmd_stack_list_variables): Likewise.
	* mi/mi-main.c (mi_cmd_trace_frame_collected): Likewise.
	* mi/mi-out.c (mi_table_begin): Likewise.
	(mi_table_header): Likewise.
	* mips-linux-nat.c (mips_linux_can_use_hw_breakpoint): Likewise.
	(mips_linux_insert_watchpoint): Likewise.
	(mips_linux_remove_watchpoint): Likewise.
	* nat/mips-linux-watch.c (mips_linux_watch_type_to_irw): Likewise.
	* nat/mips-linux-watch.h (struct mips_watchpoint): Likewise.
	(mips_linux_watch_type_to_irw): Likewise.
	* nto-procfs.c (procfs_can_use_hw_breakpoint): Likewise.
	(procfs_insert_hw_watchpoint): Likewise.
	(procfs_remove_hw_watchpoint): Likewise.
	(procfs_hw_watchpoint): Likewise.
	(procfs_can_use_hw_breakpoint): Likewise.
	(procfs_remove_hw_watchpoint): Likewise.
	(procfs_insert_hw_watchpoint): Likewise.
	* p-lang.c (pascal_op_print_tab): Likewise.
	* ppc-linux-nat.c (ppc_linux_can_use_hw_breakpoint): Likewise.
	* ppc-linux-tdep.c (ppu2spu_unwind_register): Likewise.
	* ppc-sysv-tdep.c (get_decimal_float_return_value): Likewise.
	* procfs.c (procfs_can_use_hw_breakpoint): Likewise.
	(procfs_insert_watchpoint): Likewise.
	(procfs_remove_watchpoint): Likewise.
	* psymtab.c (recursively_search_psymtabs): Likewise.
	* remote-m32r-sdi.c (m32r_can_use_hw_watchpoint): Likewise.
	(m32r_insert_watchpoint): Likewise.
	* remote-mips.c (mips_can_use_watchpoint): Likewise.
	(mips_insert_watchpoint): Likewise.
	(mips_remove_watchpoint): Likewise.
	* remote.c (watchpoint_to_Z_packet): Likewise.
	(remote_insert_watchpoint): Likewise.
	(remote_remove_watchpoint): Likewise.
	(remote_check_watch_resources): Likewise.
	* s390-linux-nat.c (s390_insert_watchpoint): Likewise.
	(s390_remove_watchpoint): Likewise.
	(s390_can_use_hw_breakpoint): Likewise.
	* s390-linux-tdep.c (s390_gdbarch_init): Likewise.
	* spu-linux-nat.c (spu_can_use_hw_breakpoint): Likewise.
	* target.h (struct target_ops): Likewise.
	* tilegx-tdep.c (tilegx_analyze_prologue): Likewise.
	* ui-out.c (struct ui_out_hdr): Likewise.
	(append_header_to_list): Likewise.
	(get_next_header): Likewise.
	(verify_field): Likewise.
	(ui_out_begin): Likewise.
	(ui_out_field_int): Likewise.
	(ui_out_field_fmt_int): Likewise.
	(ui_out_field_skip): Likewise.
	(ui_out_field_string): Likewise.
	(ui_out_field_fmt): Likewise.
	* varobj.c (new_variable): Likewise.
	* x86-nat.c (x86_insert_watchpoint): Likewise.
	(x86_remove_watchpoint): Likewise.
	(x86_can_use_hw_breakpoint): Likewise.
	* xtensa-tdep.h (struct gdbarch_tdep): Likewise.
	* inflow.c (enum gdb_has_a_terminal_flag_enum): Add name to
	previously anonymous enumeration type..
	* linux-record.h (enum gdb_syscall): Add gdb_sys_no_syscall
	value.
	* target-debug.h (target_debug_print_enum_target_hw_bp_type): New.
	(target_debug_print_enum_bptype): New.
	* target-delegates.c: Regenerate.
2015-07-31 13:19:53 -04:00
Pierre Langlois 6b940e6a06 Remove isize output argument from fast_tracepoint_valid_at
This patch removes the isize output argument from the
fast_tracepoint_valid_at gdbarch hook.  It was used to return the size
of the instruction that needs to be replaced when installing a fast
tracepoint.  Instead of getting this value from the
fast_tracepoint_valid_at hook, we can call the gdb_insn_length function.

If we do not do this, then architectures which do not have a restriction
on where to install the fast tracepoint will send uninitialized memory
off to GDBserver.  See remote_download_tracepoint:

~~~
int isize;

if (gdbarch_fast_tracepoint_valid_at (target_gdbarch (),
				      tpaddr, &isize, NULL))
  xsnprintf (buf + strlen (buf), BUF_SIZE - strlen (buf), ":F%x",
	     isize);
~~~

The default implementation of fast_tracepoint_valid_at will not set
isize resulting in uninitialized memory being sent.  Later on, GDBserver
could use this information to compute a jump offset.

gdb/ChangeLog:

	* arch-utils.c (default_fast_tracepoint_valid_at): Remove unused
	isize argument.
	* arch-utils.h (default_fast_tracepoint_valid_at): Likewise.
	* breakpoint.c (check_fast_tracepoint_sals): Adjust call to
	gdbarch_fast_tracepoint_valid_at.
	* gdbarch.sh (fast_tracepoint_valid_at): Remove isize argument.
	* gdbarch.h: Regenerate.
	* gdbarch.c: Regenerate.
	* i386-tdep.c (i386_fast_tracepoint_valid_at): Remove isize
	argument.  Do not set it.
	* remote.c (remote_download_tracepoint): Adjust call to
	gdbarch_fast_tracepoint_valid_at.  Call gdb_insn_length to get
	the instruction length.
2015-07-30 18:05:00 +01:00
Luis Machado 66c4b3e8a6 Fix problems with finishing a dummy function call on simulators.
This fixes regressions introduced with the original change to not
consider permanent breakpoints always inserted:

  6ae8866180 is the first bad commit
  commit 6ae8866180
  Author: Luis Machado <lgustavo@codesourcery.com>
  Date:   Wed Jun 17 16:50:57 2015 -0300

      Fix problems with finishing a dummy function call on simulators.

Some checks were mistakenly left out of the original patch, which
caused the following failures:

-PASS: gdb.base/shlib-call.exp: print mainshr1(1)
-PASS: gdb.base/shlib-call.exp: step into mainshr1
+FAIL: gdb.base/shlib-call.exp: print mainshr1(1)
+FAIL: gdb.base/shlib-call.exp: step into mainshr1

-PASS: gdb.cp/chained-calls.exp: q(p())
+FAIL: gdb.cp/chained-calls.exp: q(p())

-PASS: gdb.cp/chained-calls.exp: q(p() + r())
+FAIL: gdb.cp/chained-calls.exp: q(p() + r())

-PASS: gdb.cp/chained-calls.exp: g(f(g(f() + f())) + f())
+FAIL: gdb.cp/chained-calls.exp: g(f(g(f() + f())) + f())

-PASS: gdb.cp/chained-calls.exp: *c
-PASS: gdb.cp/chained-calls.exp: *c + *c
-PASS: gdb.cp/chained-calls.exp: q(*c + *c)
+FAIL: gdb.cp/chained-calls.exp: *c
+FAIL: gdb.cp/chained-calls.exp: *c + *c
+FAIL: gdb.cp/chained-calls.exp: q(*c + *c)

-PASS: gdb.cp/classes.exp: calling method for small class
+FAIL: gdb.cp/classes.exp: calling method for small class

The above is likely caused by GDB not removing the permanent
breakpoints from the target, leading to the inferior executing
the breakpoint instruction and tripping on a SIGSEGV.

gdb/ChangeLog:
2015-07-06  Luis Machado  <lgustavo@codesourcery.com>

	* breakpoint.c (remove_breakpoint_1): Don't handle permanent
	breakpoints in a special way.
	(remove_breakpoint): Likewise.
	(mark_breakpoints_out): Likewise.
2015-07-06 16:09:21 -03:00
Luis Machado 6ae8866180 Fix problems with finishing a dummy function call on simulators.
Some simulators don't handle permanent breakpoints properly and will
sometimes terminate when hitting such a breakpoint instruction or have
unwanted effects.

When a permanent breakpoint is inserted, GDB will not attempt to insert
other breakpoint locations on top of it, leading to the problem described
above.

By not marking permanent breakpoint locations as inserted, we allow the
insertion of breakpoint locations on top of the permanent ones, preventing
the simulators from running into that situation.

gdb/ChangeLog:

2015-06-17  Luis Machado  <lgustavo@codesourcery.com>

	* breakpoint.c (add_location_to_breakpoint): Don't mark permanent
	locations as inserted.
	Update and expand comment about permanent locations.
	(bp_loc_is_permanent): Don't return 0 for bp_call_dummy.
	Move comment to add_location_to_breakpoint.
	(update_global_location_list): Don't error out if a permanent
	breakpoint is not marked inserted.
	Don't error out if a non-permanent breakpoint location is inserted on
	top of a permanent breakpoint.
2015-06-17 16:50:57 -03:00
Luis Machado da4616f69f Remove unused function make_breakpoint_permanent.
make_breakpoint_permanent is no longer used anywhere and can be
safely removed.

gdb/ChangeLog:

2015-06-17  Luis Machado  <lgustavo@codesourcery.com>

	* breakpoint.c (make_breakpoint_permanent): Remove unused
	function.
	* breakpoint.h (make_breakpoint_permanent): Remove declaration.
2015-06-17 16:09:24 -03:00
Antoine Tremblay 98aa42ee02 Fix MI dprintf-insert not printing on a resolved pending location.
This patch fixes the "Format string required" error when trying to print
a dprintf on a now resolved, pending location when set via the MI interface
even if the format string is entered correctly.

This patch also adds a test case to check that issue called
mi-dprintf-pending.exp.

gdb/ChangeLog:

	PR breakpoints/16465
	* breakpoint.c (create_breakpoint): Save extra_string for
	pending breakpoints.

gdb/testsuite/ChangeLog:

	PR breakpoints/16465
	* gdb.mi/mi-dprintf-pending.c: New file.
	* gdb.mi/mi-dprintf-pending.exp: New test.
	* gdb.mi/mi-dprintf-pendshr.c: New file.
2015-06-12 08:43:17 -04:00
Martin Galvan c9cf6e20c6 Rename in_function_epilogue_p to stack_frame_destroyed_p
We concluded that gdbarch_in_function_epilogue_p is misnamed, since it
returns true if the given PC is one instruction after the one that
destroyed the stack (which isn't necessarily inside an epilogue),
therefore it should be renamed to stack_frame_destroyed_p.

I also took the liberty of renaming the arch-specific implementations to
*_stack_frame_destroyed_p as well for consistency.

gdb:

2015-05-26  Martin Galvan  <martin.galvan@tallertechnologies.com>

	* amd64-tdep.c: Replace in_function_epilogue_p with
	stack_frame_destroyed_p throughout.
	* arch-utils.c: Ditto.
	* arch-utils.h: Ditto.
	* arm-tdep.c: Ditto.
	* breakpoint.c: Ditto.
	* gdbarch.sh: Ditto.
	* hppa-tdep.c: Ditto.
	* i386-tdep.c: Ditto.
	* mips-tdep.c: Ditto.
	* nios2-tdep.c: Ditto.
	* rs6000-tdep.c: Ditto.
	* s390-linux-tdep.c: Ditto.
	* score-tdep.c: Ditto.
	* sh-tdep.c: Ditto.
	* sparc-tdep.c: Ditto.
	* sparc-tdep.h: Ditto.
	* sparc64-tdep.c: Ditto.
	* spu-tdep.c: Ditto.
	* tic6x-tdep.c: Ditto.
	* tilegx-tdep.c: Ditto.
	* xstormy16-tdep.c: Ditto.
	* gdbarch.c, gdbarch.h: Re-generated.
2015-05-26 12:07:59 +01:00
Gabriel Krisman Bertazi e31d7699a0 Remove duplicated xmalloc in update_dprintf_command_list
Code in update_dprintf_command_list performed a duplicated memory
allocation which caused an obvious memory leak.  This removes the
duplication.

gdb/
2015-04-19  Gabriel Krisman Bertazi  <gabriel@krisman.be>

	* breakpoint.c (update_dprintf_command_list): Remove duplicated
	xmalloc.
2015-04-19 20:07:33 -03:00
Jan Kratochvil 4f45d44599 Remove --xdb
Pedro Alves:

The commands that enables aren't even documented in the manual.
Judging from that, I assume that only wdb users would ever really
be using the --xdb switch.

I think it's time to drop "support" for the --xdb switch too.  I
looked through the commands that that exposes, the only that looked
potentially interesting was "go", but then it's just an alias
for "tbreak+jump", which can easily be done with "define go...end".
I'd rather free up the "go" name for something potentially
more interesting (either run control, or maybe even unrelated,
e.g., for golang).

gdb/ChangeLog
2015-04-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* NEWS (Changes since GDB 7.9): Add removed -xdb.
	* breakpoint.c (command_line_is_silent): Remove xdb_commands
	conditional.
	(_initialize_breakpoint): Remove xdb_commands for bc, ab, sb, db, ba
	and lb.
	* cli/cli-cmds.c (_initialize_cli_cmds): Remove xdb_commands for v and
	va.
	* cli/cli-decode.c (find_command_name_length): Remove xdb_commands
	conditional.
	* defs.h (xdb_commands): Remove declaration.
	* f-valprint.c (_initialize_f_valprint): Remove xdb_commands for lc.
	* guile/scm-cmd.c (command_classes): Remove xdb from comment.
	* infcmd.c (run_no_args_command, go_command): Remove.
	(_initialize_infcmd): Remove xdb_commands for S, go, g, R and lr.
	* infrun.c (xdb_handle_command): Remove.
	(_initialize_infrun): Remove xdb_commands for lz and z.
	* main.c (xdb_commands): Remove variable.
	(captured_main): Remove "xdb" from long_options.
	(print_gdb_help): Remove --xdb from help.
	* python/py-cmd.c (gdbpy_initialize_commands): Remove xdb from comment.
	* source.c (_initialize_source): Remove xdb_commands for D, ld, / and ?.
	* stack.c (backtrace_full_command, args_plus_locals_info)
	(current_frame_command): Remove.
	(_initialize_stack): Remove xdb_commands for t, T and l.
	* symtab.c (_initialize_symtab): Remove xdb_commands for lf and lg.
	* thread.c (_initialize_thread): Remove xdb_commands condition.
	* tui/tui-layout.c (tui_toggle_layout_command)
	(tui_toggle_split_layout_command, tui_handle_xdb_layout): Remove.
	(_initialize_tui_layout): Remove xdb_commands for td and ts.
	* tui/tui-regs.c (tui_scroll_regs_forward_command)
	(tui_scroll_regs_backward_command): Remove.
	(_initialize_tui_regs): Remove xdb_commands for fr, gr, sr, +r and -r.
	* tui/tui-win.c (tui_xdb_set_win_height_command): Remove.
	(_initialize_tui_win): Remove xdb_commands for U and w.
	* utils.c (pagination_on_command, pagination_off_command): Remove.
	(initialize_utils): Remove xdb_commands for am and sm.

gdb/doc/ChangeLog
2015-04-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.texinfo (Mode Options): Remove -xdb.
2015-04-11 19:49:03 +02:00
Pedro Alves 64ce06e4cd Remove 'step' parameters from 'proceed' and 'resume'
The "step" parameters of 'proceed' and 'resume' aren't really useful
as indication of whether run control wants to single-step the target,
as that information must already be retrievable from
currently_stepping.  In fact, if currently_stepping disagrees with
whether we single-stepped the target, then things break.  Thus instead
of having the same information in two places, this patch removes those
parameters.

Setting 'step_start_function' is the only user of proceed's 'step'
argument, other than passing the 'step' argument down to 'resume' and
debug log output.  Move that instead to set_step_frame, where we
already set other related fields.

clear_proceed_status keeps its "step" parameter for now because it
needs to know which set of threads should have their state cleared,
and is called before the "stepping_command" flag is set.

Tested on x86_64 Fedora 20, native and gdbserver.

gdb/ChangeLog:
2015-03-24  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (until_break_command): Adjust call to proceed.
	* gdbthread.h (struct thread_control_state) <stepping_command>:
	New field.
	* infcall.c (run_inferior_call): Adjust call to proceed.
	* infcmd.c (run_command_1, proceed_thread_callback, continue_1):
	Adjust calls to proceed.
	(set_step_frame): Set the current thread's step_start_function
	here.
	(step_once): Adjust calls to proceed.
	(jump_command, signal_command, until_next_command)
	(finish_backward, finish_forward, proceed_after_attach_callback)
	(attach_command_post_wait): Adjust calls to proceed.
	* infrun.c (proceed_after_vfork_done): Adjust call to proceed.
	(do_target_resume): New function, factored out from ...
	(resume): ... here.  Remove 'step' parameter.  Instead, check
	currently_stepping to determine whether the thread should be
	single-stepped.
	(proceed): Remove 'step' parameter and don't set the thread's
	step_start_function here.  Adjust call to 'resume'.
	(handle_inferior_event): Adjust calls to 'resume'.
	(switch_back_to_stepped_thread): Use do_target_resume instead of
	'resume'.
	(keep_going): Adjust calls to 'resume'.
	* infrun.h (proceed): Remove 'step' parameter.
	(resume): Likewise.
	* windows-nat.c (do_initial_windows_stuff): Adjust call to
	'resume'.
	* mi/mi-main.c (proceed_thread): Adjust call to 'proceed'.
2015-03-24 17:55:53 +00:00
Antoine Tremblay 1563054901 Fix breakpoint thread condition missing with mi and a pending breakpoint.
When setting a pending breakpoint with a thread condition while using
the mi interface, the thread condition would be lost by gdb when the breakpoint
was resolved.

This patch fixes this behavior by setting the thread condition properly in the
mi case.

Also, this patch modifies the mi-pending test case to test for this issue and
removes some unneeded code in the testcase and dependency on stdio.

gdb/Changelog:
	PR breakpoints/16466
	* breakpoint.c (create_breakpoint): Set thread on breakpoint struct.

gdb/testsuite/ChangeLog:
	PR breakpoints/16466
	* gdb.mi/Makefile.in: Add mi-pendshr2.sl to cleanup.
	* gdb.mi/mi-pending.c (thread_func): New function.
	(int main): Add threading support required.
	* gdb.mi/mi-pending.exp: Add tests for this issue.
	* gdb.mi/mi-pendshr.c (pendfunc1): Remove stdio dependency.
	(pendfunc2): Remove stdio dependency.
	* gdb.mi/mi-pendshr2.c: New file.
2015-03-24 08:38:49 -04:00
Keith Seitz 0578b14e99 Expand keyword lexing intelligence in the linespec parser.
This patch changes the heuristic the linespec lexer uses to
    detect a keyword in the input stream.

    Currently, the heuristic is: a word is a keyword if it
    1) points to a string that is a keyword
    2) is followed by a non-identifier character

    This is strictly more correct than using whitespace. For example,
    it allows constructs such as "break foo if(i == 1)". However,
    find_condition_and_thread in breakpoint.c does not support this expanded
    usage. It requires whitespace to follow the keyword.

    The proposed new heuristic is: a word is a keyword if it
    1) points to a string that is a keyword
    2) is followed by whitespace
    3) is not followed by another keyword string followed by whitespace

    This additional complexity allows constructs such as
    "break thread thread 3" and "break thread 3".  In the former case,
    the actual location is a symbol named "thread" to be set on thread #3.
    In the later case, the location is NULL, i.e., the default location,
    to be set on thread #3.

    In order to pass all the new tests added here, I've also had to add a
    new feature to parse_breakpoint_sals, which expands recognition of the
    default location to keywords other than "if", which is the only keyword
    currently permitted with the default (NULL) location, but there is no
    reason to exclude other keywords.

    Consequently, it will be possible to use "break thread 1" or
    "break task 1".

    In addition to all of this, it is now possible to remove the keyword_ok
    state from the linespec parser.

    gdb/ChangeLog

    	* breakpoint.c (parse_breakpoint_sals): Use
    	linespec_lexer_lex_keyword to ascertain if the user specified
    	a NULL location.
    	* linespec.c [IF_KEYWORD_INDEX]: Define.
    	(linespec_lexer_lex_keyword): Export.
    	(struct ls_parser) <keyword_ok>: Remove.
    	A keyword is only a keyword if not followed by another keyword.
    	(linespec_lexer_lex_one): Remove keyword_ok handling.
    	Add comment explaining why the parsing stream is not advanced
    	when a keyword is seen.
    	(parse_linespec): Remove parser->keyword_ok.
    	* linespec.h (linespec_lexer_lex_keyword): Add declaration.

    gdb/testsuite/ChangeLog

    	* gdb.linespec/keywords.c: New file.
    	* gdb.linespec/keywords.exp: New file.
2015-03-23 13:16:39 -07:00
Pedro Alves 7a26bd4d83 constify set_breakpoint_condition
gdb:

2015-03-20  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (set_breakpoint_condition): Make argument "exp" const.
	* breakpoint.h (set_breakpoint_condition): Update declaration.
2015-03-20 17:39:24 +00:00
Sergio Durigan Junior 10304ef3e8 Create gdb/break-catch-syscall.c
This commits cleans up the gdb/breakpoint.c file and moves everything
that is related to the 'catch syscall' command to the new file
gdb/break-catch-syscall.c.  This is just code movement, and the only
new part is the adjustment needed on 'catching_syscall_number' to use
the new 'breakpoint_find_if' function insted of relying on the
ALL_BREAKPOINTS macro.

Tested by running the 'gdb.base/catch-syscall.exp' testcase.

gdb/ChangeLog:
2015-03-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	* Makefile.in (SFILES): New source break-catch-syscall.c.
	(COMMON_OBS): New object break-catch-syscall.o.
	* break-catch-syscall.c: New file.
	* breakpoint.c: Remove inclusion of "xml-syscall.h".
	(syscall_catchpoint_p): Move declaration to break-catch-syscall.c
	(struct syscall_catchpoint): Likewise.
	(dtor_catch_syscall): Likewise.
	(catch_syscall_inferior_data): Likewise.
	(struct catch_syscall_inferior_data): Likewise.
	(get_catch_syscall_inferior_data): Likewise.
	(catch_syscall_inferior_data_cleanup): Likewise.
	(insert_catch_syscall): Likewise.
	(remove_catch_syscall): Likewise.
	(breakpoint_hit_catch_syscall): Likewise.
	(print_it_catch_syscall): Likewise.
	(print_one_catch_syscall): Likewise.
	(print_mention_catch_syscall): Likewise.
	(print_recreate_catch_syscall): Likewise.
	(catch_syscall_breakpoint_ops): Likewise.
	(syscall_catchpoint_p): Likewise.
	(create_syscall_event_catchpoint): Likewise.
	(catch_syscall_split_args): Likewise.
	(catch_syscall_command_1): Likewise.
	(is_syscall_catchpoint_enabled): Likewise.
	(catch_syscall_enabled): Likewise.
	(catching_syscall_number): Likewise.
	(catch_syscall_completer): Likewise.
	(clear_syscall_counts): Likewise.
	(initialize_breakpoint_ops): Move initialization of syscall
	catchpoints to break-catch-syscall.c.
	(_initialize_breakpoint): Move code related to syscall catchpoints
	to break-catch-syscall.c.
2015-03-11 14:13:49 -04:00
Sergio Durigan Junior badd37cec8 Implement breakpoint_find_if
This commit implements the 'breakpoint_find_if' function, which allows
code external to gdb/breakpoint.c to iterate through the list of
'struct breakpoint *'.  This is needed in order to create the
'gdb/break-catch-syscall.c' file, because one of its functions
(catching_syscall_number) needs to do this iteration.

My first thought was to share the ALL_BREAKPOINTS* macros on
gdb/breakpoint.h, but they use a global variable local to
gdb/breakpoint.c, and I did not want to share that variable.  So, in
order to keep the minimal separation, I decided to implement this
way of iterating through the existing 'struct breakpoint *'.

This function was based on BFD's bfd_sections_find_if.  If the
user-provided function returns 0, the iteration proceeds.  Otherwise,
the iteration stops and the function returns the 'struct breakpoint *'
that is being processed.  This means that the return value of this
function can be either NULL or a pointer to a 'struct breakpoint'.

gdb/ChangeLog:
2015-03-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	* breakpoint.c (breakpoint_find_if): New function.
	* breakpoint.h (breakpoint_find_if): New prototype.
2015-03-11 14:13:49 -04:00
Pedro Alves 6c63c96a22 more making TRY/CATCH callers look more like real C++ try/catch blocks
All these were caught by actually making TRY/CATCH use try/catch
behind the scenes, which then resulted in the build failing (on x86_64
Fedora 20) because there was code between the try and catch blocks.

gdb/ChangeLog:
2015-03-07  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (save_breakpoints): Adjust to avoid code between
	TRY and CATCH.
	* gdbtypes.c (safe_parse_type): Remove empty line.
	(types_deeply_equal):
	* guile/scm-frame.c (gdbscm_frame_name):
	* linux-thread-db.c (find_new_threads_once):
	* python/py-breakpoint.c (bppy_get_commands):
	* record-btrace.c (record_btrace_insert_breakpoint)
	(record_btrace_remove_breakpoint, record_btrace_start_replaying)
	(record_btrace_start_replaying): Adjust to avoid code between TRY
	and CATCH.
2015-03-07 15:19:57 +00:00
Pedro Alves 492d29ea1c Split TRY_CATCH into TRY + CATCH
This patch splits the TRY_CATCH macro into three, so that we go from
this:

~~~
  volatile gdb_exception ex;

  TRY_CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  if (ex.reason < 0)
    {
    }
~~~

to this:

~~~
  TRY
    {
    }
  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH
~~~

Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.

This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.

TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:

  TRY
    {
    }

  // some code here.

  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH

Just like it isn't valid to do that with C++'s native try/catch.

By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.

The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved.  After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch].  The result was folded into this patch so that GDB
still builds at each incremental step.

END_CATCH is necessary for two reasons:

First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:

  #define CATCH(EXCEPTION, mask) \
    for (struct gdb_exception EXCEPTION; \
         exceptions_state_mc_catch (&EXCEPTION, MASK); \
	 EXCEPTION = exception_none)

would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.

Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow.  That will
be done in END_CATCH.

After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.

IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.

gdb/ChangeLog.
2015-03-07  Pedro Alves  <palves@redhat.com>

	* common/common-exceptions.c (struct catcher) <exception>: No
	longer a pointer to volatile exception.  Now an exception value.
	<mask>: Delete field.
	(exceptions_state_mc_init): Remove all parameters.  Adjust.
	(exceptions_state_mc): No longer pop the catcher here.
	(exceptions_state_mc_catch): New function.
	(throw_exception): Adjust.
	* common/common-exceptions.h (exceptions_state_mc_init): Remove
	all parameters.
	(exceptions_state_mc_catch): Declare.
	(TRY_CATCH): Rename to ...
	(TRY): ... this.  Remove EXCEPTION and MASK parameters.
	(CATCH, END_CATCH): New.
	All callers adjusted.

gdb/gdbserver/ChangeLog:
2015-03-07  Pedro Alves  <palves@redhat.com>

	Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
	instead.
2015-03-07 15:14:14 +00:00
Gary Benson 61012eef84 New common function "startswith"
This commit introduces a new inline common function "startswith"
which takes two string arguments and returns nonzero if the first
string starts with the second.  It also updates the 295 places
where this logic was written out longhand to use the new function.

gdb/ChangeLog:

	* common/common-utils.h (startswith): New inline function.
	All places where this logic was used updated to use the above.
2015-03-06 09:42:06 +00:00
Pedro Alves 1cf4d9513a Teach GDB about targets that can tell whether a trap is a breakpoint event
The moribund locations heuristics are problematic.  This patch teaches
GDB about targets that can reliably tell whether a trap was caused by
a software or hardware breakpoint, and thus don't need moribund
locations, thus bypassing all the problems that mechanism has.

The non-stop-fair-events.exp test is frequently failing currently.
E.g., see https://sourceware.org/ml/gdb-testers/2015-q1/msg03148.html.

The root cause is a fundamental problem with moribund locations.  For
example, the stepped_breakpoint logic added by af48d08f breaks in this
case (which is what happens with that test):

 - Step thread A, no breakpoint is set at PC.

 - The kernel doesn't schedule thread A yet.

 - Insert breakpoint at A's PC, for some reason (e.g., a step-resume
   breakpoint for thread B).

 - Kernel finally schedules thread A.

 - thread A's stepped_breakpoint flag is not set, even though it now
   stepped a breakpoint instruction.

 - adjust_pc_after_break gets the PC wrong, because PC == PREV_PC, but
   stepped_breakpoint is not set.

We needed the stepped_breakpoint logic to workaround moribund
locations, because otherwise adjust_pc_after_break could apply an
adjustment when it shouldn't just because there _used_ to be a
breakpoint at PC (a moribund breakpoint location).  For example, on
x86, that's wrong if the thread really hasn't executed an int3, but
instead executed some other 1-byte long instruction.  Getting the PC
adjustment wrong of course leads to the inferior executing the wrong
instruction.

Other problems with moribund locations are:

 - if a true SIGTRAP happens to be raised when the program is
   executing the PC that used to have a breakpoint, GDB will assume
   that is a trap for a breakpoint that has recently been removed, and
   thus we miss reporting the random signal to the user.

 - to minimize that, we get rid of moribund location after a while.
   That while is defined as just a certain number of events being
   processed.  That number of events sometimes passes by before a
   delayed breakpoint is processed, and GDB confuses the trap for a
   random signal, thus reporting the random trap.  Once the user
   resumes the thread, the program crashes because the PC was not
   adjusted...

The fix for all this is to bite the bullet and get rid of heuristics
and instead rely on the target knowing accurately what caused the
SIGTRAP.  The target/kernel/stub is in the best position to know what
that, because it can e.g. consult priviledged CPU flags GDB has no
access to, or by knowing which exception vector entry was called when
the instruction trapped, etc.  Most debug APIs I've seen to date
report breakpoint hits as a distinct event in some fashion.  For
example, on the Linux kernel, whether a breakpoint was executed is
exposed to userspace in the si_code field of the SIGTRAP's siginfo.
On Windows, the debug API reports a EXCEPTION_BREAKPOINT exception
code.

We needed to keep around deleted breakpoints in an on-the-side list
(the moribund locations) for two main reasons:

  - Know that a SIGTRAP actually is a delayed event for a hit of a
    breakpoint that was removed before the event was processed, and
    thus should not be reported as a random signal.

  - So we still do the decr_pc_after_break adjustment in that case, so
    that the thread is resumed at the correct address.

In the new model, if GDB processes an event the target tells is a
breakpoint trap, and GDB doesn't find the corresponding breakpoint in
its breakpoint tables, it means that event is a delayed event for a
breakpoint that has since been removed, and thus the event should be
ignored.

For the decr_pc_after_after issue, it ends up being much simpler that
on targets that can reliably tell whether a breakpoint trapped, for
the breakpoint trap to present the PC already adjusted.  Proper
multi-threading support already implies that targets needs to be doing
decr_pc_after_break adjustment themselves, otherwise for example, in
all-stop if two threads hit a breakpoint simultaneously, and the user
does "info threads", he'll see the non-event thread that hit the
breakpoint stopped at the wrong PC.

This way (target adjusts) also ends up eliminating the need for some
awkward re-incrementing of the PC in the record-full and Linux targets
that we do today, and the need for the target_decr_pc_after_break
hook.

If the target always adjusts, then there's a case where GDB needs to
re-increment the PC.  Say, on x86, an "int3" instruction that was
explicitly written in the program traps.  In this case, GDB should
report a random SIGTRAP signal to the user, with the PC pointing at
the instruction past the int3, just like if GDB was not debugging the
program.  The user may well decide to pass the SIGTRAP to the program
because the program being debugged has a SIGTRAP handler that handles
its own breakpoints, and expects the PC to be unadjusted.

Tested on x86-64 Fedora 20.

gdb/ChangeLog:
2015-03-04  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (need_moribund_for_location_type): New function.
	(bpstat_stop_status): Don't skipping checking moribund locations
	of breakpoint types which the target tell caused a stop.
	(program_breakpoint_here_p): New function, factored out from ...
	(bp_loc_is_permanent): ... this.
	(update_global_location_list): Don't create a moribund location if
	the target supports reporting stops of the type of the removed
	breakpoint.
	* breakpoint.h (program_breakpoint_here_p): New declaration.
	* infrun.c (adjust_pc_after_break): Return early if the target has
	already adjusted the PC.  Add comments.
	(handle_signal_stop): If nothing explains a signal, and the target
	tells us the stop was caused by a software breakpoint, check if
	there's a breakpoint instruction in the memory.  If so, adjust the
	PC before presenting the stop to the user.  Otherwise, ignore the
	trap.  If nothing explains a signal, and the target tells us the
	stop was caused by a hardware breakpoint, ignore the trap.
	* target.h (struct target_ops) <to_stopped_by_sw_breakpoint,
	to_supports_stopped_by_sw_breakpoint, to_stopped_by_hw_breakpoint,
	to_supports_stopped_by_hw_breakpoint>: New fields.
	(target_stopped_by_sw_breakpoint)
	(target_supports_stopped_by_sw_breakpoint)
	(target_stopped_by_hw_breakpoint)
	(target_supports_stopped_by_hw_breakpoint): Define.
	* target-delegates.c: Regenerate.
2015-03-04 20:41:15 +00:00
Jose E. Marchesi d4777acbc9 New probe type: DTrace USDT probes.
This patch adds a new type of probe to GDB: the DTrace USDT probes.  The new
type is added by providing functions implementing all the entries of the
`probe_ops' structure defined in `probe.h'.  The implementation is
self-contained and does not depend on DTrace source code in any way.

gdb/ChangeLog:

2015-02-7  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* breakpoint.c (BREAK_ARGS_HELP): Help string updated to mention
	the -probe-dtrace new vpossible value for PROBE_MODIFIER.
	* configure.ac (CONFIG_OBS): dtrace-probe.o added if BFD can
	handle ELF files.
	* Makefile.in (SFILES): dtrace-probe.c added.
	* configure: Regenerate.
	* dtrace-probe.c: New file.
	(SHT_SUNW_dof): New constant.
	(dtrace_probe_type): New enum.
	(dtrace_probe_arg): New struct.
	(dtrace_probe_arg_s): New typedef.
	(struct dtrace_probe_enabler): New struct.
	(dtrace_probe_enabler_s): New typedef.
	(dtrace_probe): New struct.
	(dtrace_probe_is_linespec): New function.
	(dtrace_dof_sect_type): New enum.
	(dtrace_dof_dofh_ident): Likewise.
	(dtrace_dof_encoding): Likewise.
	(DTRACE_DOF_ENCODE_LSB): Likewise.
	(DTRACE_DOF_ENCODE_MSB): Likewise.
	(dtrace_dof_hdr): New struct.
	(dtrace_dof_sect): Likewise.
	(dtrace_dof_provider): Likewise.
	(dtrace_dof_probe): Likewise.
	(DOF_UINT): New macro.
	(DTRACE_DOF_PTR): Likewise.
	(DTRACE_DOF_SECT): Likewise.
	(dtrace_process_dof_probe): New function.
	(dtrace_process_dof): Likewise.
	(dtrace_build_arg_exprs): Likewise.
	(dtrace_get_arg): Likewise.
	(dtrace_get_probes): Likewise.
	(dtrace_get_probe_argument_count): Likewise.
	(dtrace_can_evaluate_probe_arguments): Likewise.
	(dtrace_evaluate_probe_argument): Likewise.
	(dtrace_compile_to_ax): Likewise.
	(dtrace_probe_destroy): Likewise.
	(dtrace_gen_info_probes_table_header): Likewise.
	(dtrace_gen_info_probes_table_values): Likewise.
	(dtrace_probe_is_enabled): Likewise.
	(dtrace_probe_ops): New variable.
	(info_probes_dtrace_command): New function.
	(_initialize_dtrace_probe): Likewise.
	(dtrace_type_name): Likewise.
2015-02-17 16:03:22 +01:00
Tom Tromey e36122e9d7 Fix redefinition errors in C++ mode
In C, we can forward declare static structure instances.  That doesn't
work in C++ though.  C++ treats these as definitions.  So then the
compiler complains about symbol redefinition, like:

 src/gdb/elfread.c:1569:29: error: redefinition of ‘const sym_fns elf_sym_fns_lazy_psyms’
 src/gdb/elfread.c:53:29: error: ‘const sym_fns elf_sym_fns_lazy_psyms’ previously declared here

The intent of static here is naturally to avoid making these objects
visible outside the compilation unit.  The equivalent in C++ would be
to instead define the objects in the anonymous namespace.  But given
that it's desirable to leave the codebase compiling as both C and C++
for a while, this just makes the objects extern.

(base_breakpoint_ops is already declared in breakpoint.h, so we can
just remove the forward declare from breakpoint.c)

gdb/ChangeLog:
2015-02-11  Tom Tromey  <tromey@redhat.com>
	    Pedro Alves <palves@redhat.com>

	* breakpoint.c (base_breakpoint_ops): Delete.
	* dwarf2loc.c (dwarf_expr_ctx_funcs): Make extern.
	* elfread.c (elf_sym_fns_gdb_index, elf_sym_fns_lazy_psyms): Make extern.
	* guile/guile.c (guile_extension_script_ops, guile_extension_ops): Make extern.
	* ppcnbsd-tdep.c (ppcnbsd2_sigtramp): Make extern.
	* python/py-arch.c (arch_object_type): Make extern.
	* python/py-block.c (block_syms_iterator_object_type): Make extern.
	* python/py-bpevent.c (breakpoint_event_object_type): Make extern.
	* python/py-cmd.c (cmdpy_object_type): Make extern.
	* python/py-continueevent.c (continue_event_object_type)
	* python/py-event.h (GDBPY_NEW_EVENT_TYPE): Remove 'qual'
	parameter.  Update all callers.
	* python/py-evtregistry.c (eventregistry_object_type): Make extern.
	* python/py-exitedevent.c (exited_event_object_type): Make extern.
	* python/py-finishbreakpoint.c (finish_breakpoint_object_type): Make extern.
	* python/py-function.c (fnpy_object_type): Make extern.
	* python/py-inferior.c (inferior_object_type, membuf_object_type): Make extern.
	* python/py-infevents.c (call_pre_event_object_type)
	(inferior_call_post_event_object_type).
	(memory_changed_event_object_type): Make extern.
	* python/py-infthread.c (thread_object_type): Make extern.
	* python/py-lazy-string.c (lazy_string_object_type): Make extern.
	* python/py-linetable.c (linetable_entry_object_type)
	(linetable_object_type, ltpy_iterator_object_type): Make extern.
	* python/py-newobjfileevent.c (new_objfile_event_object_type)
	(clear_objfiles_event_object_type): Make extern.
	* python/py-objfile.c (objfile_object_type): Make extern.
	* python/py-param.c (parmpy_object_type): Make extern.
	* python/py-progspace.c (pspace_object_type): Make extern.
	* python/py-signalevent.c (signal_event_object_type): Make extern.
	* python/py-symtab.c (symtab_object_type, sal_object_type): Make extern.
	* python/py-type.c (type_object_type, field_object_type)
	(type_iterator_object_type): Make extern.
	* python/python.c (python_extension_script_ops)
	(python_extension_ops): Make extern.
	* stap-probe.c (stap_probe_ops): Make extern.
2015-02-11 11:20:21 +00:00
Simon Marchi b9d6130764 "enable count" user input error handling (PR gdb/15678)
Typing "enable count" by itself crashes GDB. Also, if you omit the
breakpoint number/range, the error message is not very clear:

(gdb) enable count 2
warning: bad breakpoint number at or near ''
(gdb) enable count
Segmentation fault (core dumped)

With this patch, the error messages are slightly more helpful:

(gdb) enable count 2
Argument required (one or more breakpoint numbers).
(gdb) enable count
Argument required (hit count).

gdb/ChangeLog:

	PR gdb/15678
	* breakpoint.c (map_breakpoint_numbers): Check for empty args
	string.
	(enable_count_command): Check args for NULL value.

gdb/testsuite/ChangeLog:

	PR gdb/15678
	* gdb.base/ena-dis-br.exp: Test "enable count" for bad user input.
2015-02-06 10:27:01 -05:00
Pedro Alves 5589af0e66 PR17525 - breakpoint commands not executed when program run from -x script
Executing a gdb script that runs the inferior (from the command line
with -x), and has it hit breakpoints with breakpoint commands that
themselves run the target, is currently broken on async targets
(Linux, remote).

While we're executing a command list or a script, we force the
interpreter to be sync, which results in some functions nesting an
event loop and waiting for the target to stop, instead of returning
immediately and having the top level event loop handle the stop.

The issue with this bug is simply that bpstat_do_actions misses
checking whether the interpreter is sync.  When we get here, in the
case of executing a script (or, when the interpreter is sync), the
program has already advanced to the next breakpoint, through
maybe_wait_sync_command_done.  We need to process its breakpoints
immediately, just like with a sync target.

Tested on x86_64 Fedora 20.

gdb/
2015-01-14  Pedro Alves  <palves@redhat.com>

	PR gdb/17525
	* breakpoint.c: Include "interps.h".
	(bpstat_do_actions_1): Also check whether the interpreter is
	async.

gdb/testsuite/
2015-01-14  Pedro Alves  <palves@redhat.com>
	    Joel Brobecker  <brobecker@adacore.com>

	PR gdb/17525
	* gdb.base/bp-cmds-execution-x-script.c: New file.
	* gdb.base/bp-cmds-execution-x-script.exp: New file.
	* gdb.base/bp-cmds-execution-x-script.gdb: New file.
2015-01-14 12:34:12 +00:00
Pedro Alves 9c02b52532 linux-nat.c: better starvation avoidance, handle non-stop mode too
Running the testsuite with a series that reimplements user-visible
all-stop behavior on top of a target running in non-stop mode revealed
problems related to event starvation avoidance.

For example, I see
gdb.threads/signal-while-stepping-over-bp-other-thread.exp failing.
What happens is that GDB core never gets to see the signal event.  It
ends up processing the events for the same threads over an over,
because Linux's waitpid(-1, ...) returns that first task in the task
list that has an event, starving threads on the tail of the task list.

So I wrote a non-stop mode test originally inspired by
signal-while-stepping-over-bp-other-thread.exp, to stress this
independently of all-stop on top of non-stop.  Fixing it required the
changes described below.  The test will be added in a following
commit.

1) linux-nat.c has code in place that picks an event LWP at random out
of all that have had events.  This is because on the kernel side,
"waitpid(-1, ...)"  just walks the task list linearly looking for the
first that had an event.  But, this code is currently only used in
all-stop mode.  So with a multi-threaded program that has multiple
events triggering debug events in parallel, GDB ends up starving some
threads.

To make the event randomization work in non-stop mode too, the patch
makes us pull out all the already pending events on the kernel side,
with waitpid, before deciding which LWP to report to the core.

There's some code in linux_wait that takes care of leaving events
pending if they were for LWPs the caller is not interested in.  The
patch moves that to linux_nat_filter_event, so that we only have one
place that leaves events pending.  With that in place, conceptually,
the flow is simpler and more normalized:

 #1 - walk the LWP list looking for an LWP with a pending event to report.
 #2 - if no pending event, pull events out of the kernel, and store
      them in the LWP structures as pending.
 #3- goto #1.

2) Then, currently the event randomization code only considers SIGTRAP
(or trap-like) events.  That means that if e.g., have have multiple
threads stepping in parallel that hit a breakpoint that needs stepping
over, and one gets a signal, the signal may end up never getting
processed, because GDB will always be giving priority to the SIGTRAPs.
The patch fixes this by making the randomization code consider all
kinds of pending events.

3) If multiple threads hit a breakpoint, we report one of those, and
"cancel" the others.  Cancelling means decrementing the PC, and
discarding the event.  If the next time the LWP is resumed the
breakpoint is still installed, the LWP should hit it again, and we'll
report the hit then.  The problem I found is that this delays threads
from advancing too much, with the kernel potentially ending up
scheduling the same threads over and over, and others not advancing.
So the patch switches away from cancelling the breakpoints, and
instead remembering that the LWP had stopped for a breakpoint.  If on
resume the breakpoint is still installed, we report it.  If it's no
longer installed, we discard the pending event then.  This is actually
how GDBserver used to handle this before d50171e4 (Teach linux
gdbserver to step-over-breakpoints), but with the difference that back
then we'd delay adjusting the PC until resuming, which made it so that
"info threads" could wrongly see threads with unadjusted PCs.

gdb/
2015-01-09  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (hardware_breakpoint_inserted_here_p): New
	function.
	* breakpoint.h (hardware_breakpoint_inserted_here_p): New
	declaration.
	* linux-nat.c (linux_nat_status_is_event): Move higher up in file.
	(linux_resume_one_lwp): Store the thread's PC.  Adjust to clear
	stop_reason.
	(check_stopped_by_watchpoint): New function.
	(save_sigtrap): Reimplement.
	(linux_nat_stopped_by_watchpoint): Adjust.
	(linux_nat_lp_status_is_event): Delete.
	(stop_wait_callback): Only call save_sigtrap after storing the
	pending status.
	(status_callback): If the thread had been stopped for a breakpoint
	that has since been removed, discard the event and resume the LWP.
	(count_events_callback, select_event_lwp_callback): Use
	lwp_status_pending_p instead of linux_nat_lp_status_is_event.
	(cancel_breakpoint): Rename to ...
	(check_stopped_by_breakpoint): ... this.  Record whether the LWP
	stopped for a software breakpoint or hardware breakpoint.
	(select_event_lwp): Only give preference to the stepping LWP in
	all-stop mode.  Adjust comments.
	(stop_and_resume_callback): Remove references to new_pending_p.
	(linux_nat_filter_event): Likewise.  Leave exit events of the
	leader thread pending here.  Handle signal short circuiting here.
	Only call save_sigtrap after storing the pending waitstatus.
	(linux_nat_wait_1): Remove 'retry' label.  Remove references to
	new_pending.  Don't handle leaving events the caller is not
	interested in pending here, nor handle signal short-circuiting
	here.  Also give equal priority to all LWPs that have had events
	in non-stop mode.  If reporting a software breakpoint event,
	unadjust the LWP's PC.
	* linux-nat.h (enum lwp_stop_reason): New.
	(struct lwp_info) <stop_pc>: New field.
	(struct lwp_info) <stopped_by_watchpoint>: Delete field.
	(struct lwp_info) <stop_reason>: New field.
	* x86-linux-nat.c (x86_linux_prepare_to_resume): Adjust.
2015-01-09 14:42:03 +00:00
Pedro Alves f7ce857f51 cleanup and speed up (software_)breakpoint_inserted_here_p
Factor out common code, and use the more efficient
ALL_BP_LOCATIONS_AT_ADDR.

gdb/
2015-01-09  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (bp_location_inserted_here_p): New function,
	factored out from ...
	(breakpoint_inserted_here_p): ... here.  Use
	ALL_BP_LOCATIONS_AT_ADDR.
	(software_breakpoint_inserted_here_p): Use
	bp_location_inserted_here_p and ALL_BP_LOCATIONS_AT_ADDR.
2015-01-09 14:40:11 +00:00
Joel Brobecker 32d0add0a6 Update year range in copyright notice of all files owned by the GDB project.
gdb/ChangeLog:

        Update year range in copyright notice of all files.
2015-01-01 13:32:14 +04:00
Simon Marchi fc1269757f Only leave dprintf inserted if it is marked as persistent (PR breakpoints/17012)
On Linux native, if dprintfs are inserted when detaching, they are left
in the inferior which causes it to crash from a SIGTRAP. It also happens
with dprintfs on remote targets, when set disconnected-dprintf is off.

The rationale of the line modified by the patch was to leave dprintfs
inserted in order to support disconnected dprintfs. However, not all
dprintfs are persistent. Also, there's no reason other kinds of
breakpoints can't be persistent either. So this replaces the bp_dprintf
check with a check on whether the location is persistent.

bl->target_info.persist will be 1 only if disconnected-dprintf is on and
we are debugging a remote target. On native, it will always be 0,
regardless of the value of disconnected-dprintf. This makes sense, since
disconnected dprintfs are not supported by the native target.

One issue about the test is that it does not pass when using
--target_board=native-extended-gdbserver, partly due to bug 17302 [1].

One quick hack I tried for this was to add a useless "next" between the
call to getpid() and detach, which avoids the bug. There is still one
case where the test fails, and that is with:

- breakpoint always-inserted on
- dprintf-style agent
- disconnected-dprintf on

What happens is that my detach does not actually detach the process,
because some persistent commands (the disconnected dprintf) is present.
However since gdbserver is ran with --once, when gdb disconnects,
gdbserver goes down and takes with it all the processes it spawned and
that are still under its control (which includes my test process).
When the test checks if the test process is still alive, it obvisouly
fails. Investigating about that led me to ask a question on the ML [2]
about the behavior of detach.

Until the remote case is sorted out, the problematic test is marked as
KFAIL.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=17302
[2] https://sourceware.org/ml/gdb/2014-08/msg00115.html

gdb/Changelog:

	PR breakpoints/17012
	* breakpoint.c (remove_breakpoints_pid): Skip removing
	breakpoint if it is marked as persistent.

gdb/testsuite/ChangeLog:

	PR breakpoints/17012
	* gdb.base/dprintf-detach.c: New file.
	* gdb.base/dprintf-detach.exp: New file.
2014-12-10 16:10:05 -05:00
Joel Brobecker e8af5d7a5c Always consider infcall breakpoints as non-permanent.
A recent change...

    commit 1a853c5224
    Date:   Wed Nov 12 10:10:49 2014 +0000
    Subject: make "permanent breakpoints" per location and disableable

... broke function calls on sparc-elf when running over QEMU. Any
function call should demonstrate the problem.

For instance, seen from the debugger:

    (gdb) call pn(1234)
    [Inferior 1 (Remote target) exited normally]
    The program being debugged exited while in a function called from GDB.
    Evaluation of the expression containing the function

And seen from QEMU:

    qemu: fatal: Trap 0x02 while interrupts disabled, Error state
    [register dump removed]

What happens in this case is that GDB sets the inferior function call
by not only creating the dummy frame, but also writing a breakpoint
instruction at the return address for our function call. See infcall.c:

        /* Write a legitimate instruction at the point where the infcall
           breakpoint is going to be inserted.  While this instruction
           is never going to be executed, a user investigating the
           memory from GDB would see this instruction instead of random
           uninitialized bytes.  We chose the breakpoint instruction
           as it may look as the most logical one to the user and also
           valgrind 3.7.0 needs it for proper vgdb inferior calls.

           If software breakpoints are unsupported for this target we
           leave the user visible memory content uninitialized.  */

        bp_addr_as_address = bp_addr;
        bp_bytes = gdbarch_breakpoint_from_pc (gdbarch, &bp_addr_as_address,
                                               &bp_size);
        if (bp_bytes != NULL)
          write_memory (bp_addr_as_address, bp_bytes, bp_size);

This instruction triggers a change introduced by the commit above,
where we consider bp locations as being permanent breakpoints
if there is already a breakpoint instruction at that address:

        +  if (bp_loc_is_permanent (loc))
        +    {
        +      loc->inserted = 1;
        +      loc->permanent = 1;
        +    }

As a result, when resuming the program's execution for the inferior
function call, GDB decides that it does not need to insert a breakpoint
at this address, expecting the target to just report a SIGTRAP when
trying to execute that instruction.

But unfortunately for us, at least some versions of QEMU for SPARC
just terminate the execution entirely instead of reporting a breakpoint,
thus producing the behavior reported here.

Although it appears like QEMU might be misbehaving and should therefore
be fixed (to be verified) from the user's point of view, the recent
change does introduce a regression. So this patch tries to mitigate
a bit the damage by handling such infcall breakpoints as special and
making sure that they are never considered permanent, thus restoring
the previous behavior specifically for those breakpoints.

The option of not writing the breakpoint instructions in the first
place was considered, and would probably work also. But the comment
associated to it seems to indicate that there is still reason to
keep it.

gdb/ChangeLog:

        * breakpoint.c (bp_loc_is_permanent): Return 0 if LOC corresponds
        to a bp_call_dummy breakpoint type.

Tested on x86_64-linux. Also testing on sparc-elf/QEMU using
AdaCore's testsuite.
2014-11-23 14:34:52 +04:00