963f9c80cb
When GDB finds out the target triggered a watchpoint, and the target has non-continuable watchpoints, GDB sets things up to step past the instruction that triggered the watchpoint. This is just like stepping past a breakpoint, but goes through a different mechanism - it resumes only the thread that needs to step past the watchpoint, but also switches a "infwait state" global, that has the effect that the next target_wait only wait for events only from that thread. This forcing of a ptid to pass to target_wait obviously becomes a bottleneck if we ever support stepping past different watchpoints simultaneously (in separate processes). It's also unnecessary -- the target should only return events for threads that have been resumed; if no other thread than the one we're stepping past the watchpoint has been resumed, then those other threads should not report events. If we couldn't assume that, then stepping past regular breakpoints would be broken for not likewise forcing a similar infwait_state. So this patch eliminates infwait_state, and instead teaches keep_going to mark step_over_info in a way that has the breakpoints module skip inserting watchpoints (because we're stepping past one), like it skips breakpoints when we're stepping past one. Tested on: - x86_64 Fedora 20 (continuable watchpoints) - PPC64 Fedora 18 (non-steppable watchpoints) gdb/ 2014-10-15 Pedro Alves <palves@redhat.com> * breakpoint.c (should_be_inserted): Don't insert watchpoints if trying to step past a non-steppable watchpoint. * gdbthread.h (struct thread_info) <stepping_over_watchpoint>: New field. * infrun.c (struct step_over_info): Add new field 'nonsteppable_watchpoint_p' and adjust comments. (set_step_over_info): New 'nonsteppable_watchpoint_p' parameter. Adjust. (clear_step_over_info): Clear nonsteppable_watchpoint_p as well. (stepping_past_nonsteppable_watchpoint): New function. (step_over_info_valid_p): Also return true if stepping past a nonsteppable watchpoint. (proceed): Adjust call to set_step_over_info. Remove reference to init_infwait_state. (init_wait_for_inferior): Remove reference to init_infwait_state. (waiton_ptid): Delete global. (struct execution_control_state) <stepped_after_stopped_by_watchpoint>: Delete field. (wait_for_inferior, fetch_inferior_event): Always pass minus_one_ptid to target_wait. (init_thread_stepping_state): Clear 'stepping_over_watchpoint' field. (init_infwait_state): Delete function. (handle_inferior_event): Remove infwait_state handling. (handle_signal_stop) <watchpoints handling>: Adjust after stepped_after_stopped_by_watchpoint removal. Don't remove breakpoints here nor set infwait_state. Set the thread's stepping_over_watchpoint flag, and call keep_going instead. (keep_going): Handle stepping_over_watchpoint. Adjust set_step_over_info calls. * infrun.h (stepping_past_nonsteppable_watchpoint): Declare function.
193 lines
6.8 KiB
C
193 lines
6.8 KiB
C
/* Copyright (C) 1986-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef INFRUN_H
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#define INFRUN_H 1
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#include "symtab.h"
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struct target_waitstatus;
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struct frame_info;
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struct address_space;
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/* True if we are debugging run control. */
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extern unsigned int debug_infrun;
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/* True if we are debugging displaced stepping. */
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extern int debug_displaced;
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/* Nonzero if we want to give control to the user when we're notified
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of shared library events by the dynamic linker. */
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extern int stop_on_solib_events;
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/* Are we simulating synchronous execution? This is used in async gdb
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to implement the 'run', 'continue' etc commands, which will not
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redisplay the prompt until the execution is actually over. */
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extern int sync_execution;
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/* True if execution commands resume all threads of all processes by
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default; otherwise, resume only threads of the current inferior
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process. */
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extern int sched_multi;
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/* When set, stop the 'step' command if we enter a function which has
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no line number information. The normal behavior is that we step
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over such function. */
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extern int step_stop_if_no_debug;
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/* If set, the inferior should be controlled in non-stop mode. In
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this mode, each thread is controlled independently. Execution
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commands apply only to the selected thread by default, and stop
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events stop only the thread that had the event -- the other threads
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are kept running freely. */
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extern int non_stop;
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/* When set (default), the target should attempt to disable the
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operating system's address space randomization feature when
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starting an inferior. */
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extern int disable_randomization;
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/* Reverse execution. */
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enum exec_direction_kind
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{
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EXEC_FORWARD,
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EXEC_REVERSE
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};
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/* The current execution direction. This should only be set to enum
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exec_direction_kind values. It is only an int to make it
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compatible with make_cleanup_restore_integer. */
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extern int execution_direction;
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/* Save register contents here when executing a "finish" command or
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are about to pop a stack dummy frame, if-and-only-if
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proceed_to_finish is set. Thus this contains the return value from
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the called function (assuming values are returned in a
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register). */
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extern struct regcache *stop_registers;
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extern void start_remote (int from_tty);
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/* Clear out all variables saying what to do when inferior is
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continued or stepped. First do this, then set the ones you want,
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then call `proceed'. STEP indicates whether we're preparing for a
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step/stepi command. */
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extern void clear_proceed_status (int step);
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extern void proceed (CORE_ADDR, enum gdb_signal, int);
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/* The `resume' routine should only be called in special circumstances.
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Normally, use `proceed', which handles a lot of bookkeeping. */
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extern void resume (int, enum gdb_signal);
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/* Return a ptid representing the set of threads that we will proceed,
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in the perspective of the user/frontend. */
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extern ptid_t user_visible_resume_ptid (int step);
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extern void wait_for_inferior (void);
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extern void normal_stop (void);
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extern void get_last_target_status (ptid_t *ptid,
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struct target_waitstatus *status);
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extern void prepare_for_detach (void);
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extern void fetch_inferior_event (void *);
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extern void init_wait_for_inferior (void);
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extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
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struct symtab_and_line ,
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struct frame_id);
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/* Returns true if we're trying to step past the instruction at
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ADDRESS in ASPACE. */
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extern int stepping_past_instruction_at (struct address_space *aspace,
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CORE_ADDR address);
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/* Returns true if we're trying to step past an instruction that
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triggers a non-steppable watchpoint. */
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extern int stepping_past_nonsteppable_watchpoint (void);
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extern void set_step_info (struct frame_info *frame,
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struct symtab_and_line sal);
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/* Several print_*_reason helper functions to print why the inferior
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has stopped to the passed in UIOUT. */
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/* Signal received, print why the inferior has stopped. */
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extern void print_signal_received_reason (struct ui_out *uiout,
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enum gdb_signal siggnal);
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/* Print why the inferior has stopped. We are done with a
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step/next/si/ni command, print why the inferior has stopped. */
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extern void print_end_stepping_range_reason (struct ui_out *uiout);
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/* The inferior was terminated by a signal, print why it stopped. */
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extern void print_signal_exited_reason (struct ui_out *uiout,
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enum gdb_signal siggnal);
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/* The inferior program is finished, print why it stopped. */
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extern void print_exited_reason (struct ui_out *uiout, int exitstatus);
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/* Reverse execution: target ran out of history info, print why the
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inferior has stopped. */
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extern void print_no_history_reason (struct ui_out *uiout);
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extern void print_stop_event (struct target_waitstatus *ws);
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extern int signal_stop_state (int);
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extern int signal_print_state (int);
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extern int signal_pass_state (int);
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extern int signal_stop_update (int, int);
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extern int signal_print_update (int, int);
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extern int signal_pass_update (int, int);
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extern void update_signals_program_target (void);
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/* Clear the convenience variables associated with the exit of the
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inferior. Currently, those variables are $_exitcode and
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$_exitsignal. */
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extern void clear_exit_convenience_vars (void);
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/* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
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extern void displaced_step_dump_bytes (struct ui_file *file,
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const gdb_byte *buf, size_t len);
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extern struct displaced_step_closure *get_displaced_step_closure_by_addr
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(CORE_ADDR addr);
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extern void update_observer_mode (void);
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extern void signal_catch_update (const unsigned int *);
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/* In some circumstances we allow a command to specify a numeric
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signal. The idea is to keep these circumstances limited so that
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users (and scripts) develop portable habits. For comparison,
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POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
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numeric signal at all is obsolescent. We are slightly more lenient
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and allow 1-15 which should match host signal numbers on most
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systems. Use of symbolic signal names is strongly encouraged. */
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enum gdb_signal gdb_signal_from_command (int num);
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#endif /* INFRUN_H */
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