Fix PR 10970, PR 12702.
* linux-nat.c (linux_lwp_is_zombie): New function.
(wait_lwp): Initialize status. New variable prev_mask. Block signals.
Check for linux_lwp_is_zombie. Use WNOHANG and sigsuspend.
gdb/testsuite/
* gdb.threads/leader-exit.c: New file.
* gdb.threads/leader-exit.exp: New file.
gdb/
* record.c: Include event-loop.h, inf-loop.h.
(record_beneath_to_async): New global.
(tmp_to_async): New global.
(record_async_inferior_event_token): New global.
(record_open_1): Don't error out if async is enabled.
(record_open): Handle to_async. Create an async event source in
the event loop.
(record_close): Delete the async event source.
(record_resumed): New global.
(record_execution_dir): New global.
(record_resume, record_core_resume): Set them. Register the
target on the event loop.
(record_wait): Rename to ...
(record_wait_1): ... this. Add more debug output. Handle
TARGET_WNOHANG, and the target beneath returning
TARGET_WAITKIND_IGNORE.
(record_wait): Reimplement on top of record_wait_1.
(record_async_mask_value): New global.
(record_async, record_async_mask, record_can_async_p)
(record_is_async_p, record_execution_direction): New functions.
(init_record_ops, init_record_core_ops): Install new methods.
* infrun.c (fetch_inferior_event): Temporarily switch the global
execution direction to the direction the target was going.
(execution_direction): Change type to int.
* target.c (default_execution_direction): New function.
(update_current_target): Inherit and de_fault
to_execution_direction.
* target.h (struct target_ops) <to_execution_direction>: New
field.
(target_execution_direction): New macro.
* inferior.h (execution_direction): Change type to int.
gdb/
* infcmd.c (finish_backward): Set a step-resume breakpoint at the
function's entry point instead of a manually managed momentary
breakpoint, and only ever issue one proceed call.
* infrun.c (handle_inferior_event) <BPSTAT_WHAT_STEP_RESUME>: If
doing a reverse-finish, switch to stepi mode, to do another step.
(insert_step_resume_breakpoint_at_sal): Make public.
(normal_stop): No need to save function value return registers if
going reverse.
* inferior.h (insert_step_resume_breakpoint_at_sal): Declare.
gdb/testsuite/
* gdb.reverse/finish-reverse-bkpt.exp: New test.
for ALPHA_ZERO_REGNUM.
(alpha_supply_int_regs): Explicitly supply zero as the value for
ALPHA_ZERO_REGNUM in the register cache.
* alpha-nat.c (fetch_osf_core_registers): Ditto.
gdb/
* breakpoint.c (watchpoint_check): If the watchpoint went out of
scope, clear its command list.
(map_breakpoint_numbers): Don't walk the related breakpoints list
of each breakpoint.
gdb/testsuite/
* gdb.base/commands.exp (watchpoint_command_test): Check that the
watchpoint's command list didn't execute when the watchpoint went
out of scope.
* symfile.h (enum dwarf2_section_enum): New type.
(dwarf2_get_section_info): New prototype.
* dwarf2read.c (dwarf2_get_section_info): Replace parameter
section_name by sect. Use a switch to select the info.
* dwarf2-frame.c (warf2_get_section_info): Remove prototype.
(dwarf2_build_frame_info): Adjust calls to dwarf2_get_section_info.
gdb/
* solib-svr4.c (svr4_solib_create_inferior_hook): Skip setting
shared library event breakpoint if there's no execution.
gdb/testsuite/
* gdb.trace/tfile.exp: Add test that opening the basic.tf trace
file doesn't error, using MI.
* c-lang.c (evaluate_subexp_c): Use expect_type if it is not
NULL.
gdb/testsuite
* gdb.base/charset.exp (string_display): Add tests to assign to
arrays.
* gdb.base/charset.c (short_array, int_array, long_array): New.
zero as the value for %g0 in the register cache.
* sparc-tdep.c (sparc32_supply_gregset): Likewise.
* sparc64-tdep.c (sparc64_supply_gregset): Likewise.
gdb/
* infcmd.c: Include "inf-loop.h".
(step_once): When stepping into an inline subroutine, pretend the
target has run. If the target can async, switch the inferior
event loop to INF_EXEC_COMPLETE.
* inferior.h (user_visible_resume_ptid): Declare.
* infrun.c (user_visible_resume_ptid): New function, factored out
from `resume'.
(resume): Use it.
* mi/mi-main.c (mi_execute_async_cli_command): Remove assertion
that the current thread is running. Merge async and sync
branches.
gdb/
* tracepoint.c: Include exceptions.h.
(TFILE_PID): Move higher in file.
(tfile_open): Delay pushing the tfile target until we're assured
the tfile header is present in the file. Wrap reading the initial
newline-terminated lines in TRY_CATCH. Pop the target if the
initial setup failed. Add the tfile's thread immediately
aftwards, before any non-essential setup. Don't skip
post_create_inferior if there are no traceframes present in the
file.
(tfile_close): Remove redundant check for null before xfree call.
(tfile_thread_alive): New function.
(init_tfile_ops): Register it as to_thread_alive callback.
quote pattern to avoid problems with Cygwin/mingw expect versions.
* gdb.base/default.exp (show convenience): Use double
quote pattern for regular expressions.
Fix -readnow for -gdwarf-4 unused type units.
* dwarf2read.c (struct signatured_type): Remove the field offset.
(create_signatured_type_table_from_index): Remove its initialization.
(create_debug_types_hash_table): Likewise. Initialize per_cu.offset
instead. Add a complaint call.
(process_psymtab_comp_unit): Change assignment to gdb_assert.
(process_type_comp_unit, lookup_die_type, dump_die_shallow)
(lookup_signatured_type_at_offset, read_signatured_type)
(write_one_signatured_type): Update the field for per_cu.
gdb/testsuite/
Fix -readnow for -gdwarf-4 unused type units.
* gdb.dwarf2/dw4-sig-type-unused.S: New file.
* gdb.dwarf2/dw4-sig-type-unused.exp: New file.
