binutils-gdb/gdb/thread-fsm.c

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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 19:23:24 +02:00
/* Thread command's finish-state machine, for GDB, the GNU debugger.
Copyright (C) 2015-2017 Free Software Foundation, Inc.
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 19:23:24 +02:00
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "thread-fsm.h"
/* See thread-fsm.h. */
void
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
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thread_fsm_ctor (struct thread_fsm *self, struct thread_fsm_ops *ops,
struct interp *cmd_interp)
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.
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{
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
2016-06-21 02:11:53 +02:00
self->command_interp = cmd_interp;
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 19:23:24 +02:00
self->finished = 0;
self->ops = ops;
}
/* See thread-fsm.h. */
void
thread_fsm_delete (struct thread_fsm *self)
{
if (self != NULL)
{
if (self->ops->dtor != NULL)
self->ops->dtor (self);
xfree (self);
}
}
/* See thread-fsm.h. */
void
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
2016-06-21 02:11:53 +02:00
thread_fsm_clean_up (struct thread_fsm *self, struct thread_info *thread)
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 19:23:24 +02:00
{
if (self->ops->clean_up != NULL)
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
2016-06-21 02:11:53 +02:00
self->ops->clean_up (self, thread);
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 19:23:24 +02:00
}
/* See thread-fsm.h. */
int
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
2016-06-21 02:11:53 +02:00
thread_fsm_should_stop (struct thread_fsm *self, struct thread_info *thread)
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 19:23:24 +02:00
{
Push thread->control.command_interp to the struct thread_fsm I noticed that if we step into an inline function, step_1 never reaches proceed, and thus nevers sets the thread's tp->control.command_interp. Because of that, should_print_stop_to_console fails to determine that is should print stop output to the console. The fix is to set the thread's command_interp earlier. However, I realized that we can move that field to the thread_fsm, given that its lifetime is exactly the same as thread_fsm. So the patch plumbs all fsms constructors to take the command interp and store it in the thread_fsm. We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp test, and issuing a step when stopped at line 67: &"s\n" ^running *running,thread-id="all" (gdb) ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) s &"s\n" ^running *running,thread-id="all" (gdb) + ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n" + ~"67\t result = func2 ();\n" *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0" (gdb) (The inline-cmds.exp command is adjusted to exercise this.) (Due to the follow_fork change, this also fixes "next N" across a fork with "set follow-fork child" with "set detach-on-fork on". Commands that rely on internal breakpoints, like "finish" will still require more work to migrate breakpoints etc. to the child thread.) gdb/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter. (until_break_fsm_should_stop, until_break_fsm_clean_up): Add thread parameter. (until_break_command): Pass command interpreter to thread fsm ctor. * cli/cli-interp.c (should_print_stop_to_console): Adjust. * gdbthread.h (struct thread_control_state) <command_interp>: Delete field. * infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter. Pass it down. (call_thread_fsm_should_stop): Add thread parameter. (call_function_by_hand_dummy): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. * infcmd.c: Include interps.h. (struct step_command_fsm) <thread>: Delete field. (new_step_command_fsm): Add 'cmd_interp' parameter. Pass it down. (step_command_fsm_prepare): Remove references to fsm's thread field. (step_1): Pass command interpreter to thread fsm ctor. Pass thread pointer to fsm clean up method. (step_command_fsm_should_stop, step_command_fsm_clean_up): Add thread parameter and use it. (new_until_next_fsm): Add 'cmd_interp' parameter. Pass it down. (until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread parameter and use it. (until_next_command): Pass command interpreter to thread fsm ctor. (struct finish_command_fsm) <thread>: Delete field. (finish_command_fsm_ops): Add NULL slot for should_notify_stop. (new_finish_command_fsm): Add 'cmd_interp' parameter and pass it down. Remove thread parameter and adjust. (finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add thread parameter and use it. (finish_command): Pass command interpreter to thread fsm ctor. Don't pass thread. * infrun.c (follow_fork): Move thread fsm to child fork instead of command interpreter, only. (clear_proceed_status_thread): Remove reference to command_interp. (proceed): Don't record the thread's command interpreter. (clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up method. (fetch_inferior_event): Pass thread to fsm should_stop method. * thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter. Store it. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter and pass it down. * thread-fsm.h (struct thread_fsm) <command_interp>: New field. (struct thread_fsm_ops) <clean_up, should_stop>: Add thread parameter. (thread_fsm_ctor): Add 'cmd_interp' parameter. (thread_fsm_clean_up, thread_fsm_should_stop): Add thread parameter. * thread.c (thread_cancel_execution_command): Pass thread to thread fsm clean_up method. gdb/testsuite/ChangeLog: 2016-06-21 Pedro Alves <palves@redhat.com> * gdb.opt/inline-cmds.c: Add "set mi break here" marker. * gdb.opt/inline-cmds.exp: Add MI tests.
2016-06-21 02:11:53 +02:00
return self->ops->should_stop (self, thread);
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 19:23:24 +02:00
}
/* See thread-fsm.h. */
struct return_value_info *
thread_fsm_return_value (struct thread_fsm *self)
{
if (self->ops->return_value != NULL)
return self->ops->return_value (self);
return NULL;
}
/* See thread-fsm.h. */
void
thread_fsm_set_finished (struct thread_fsm *self)
{
self->finished = 1;
}
/* See thread-fsm.h. */
int
thread_fsm_finished_p (struct thread_fsm *self)
{
return self->finished;
}
/* See thread-fsm.h. */
enum async_reply_reason
thread_fsm_async_reply_reason (struct thread_fsm *self)
{
/* If we didn't finish, then the stop reason must come from
elsewhere. E.g., a breakpoint hit or a signal intercepted. */
gdb_assert (thread_fsm_finished_p (self));
return self->ops->async_reply_reason (self);
}
/* See thread-fsm.h. */
int
thread_fsm_should_notify_stop (struct thread_fsm *self)
{
if (self->ops->should_notify_stop != NULL)
return self->ops->should_notify_stop (self);
return 1;
}