671 lines
25 KiB
C++
671 lines
25 KiB
C++
/* Multi-process/thread control defs for GDB, the GNU debugger.
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Copyright (C) 1987-2017 Free Software Foundation, Inc.
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Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
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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 GDBTHREAD_H
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#define GDBTHREAD_H
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struct symtab;
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#include "breakpoint.h"
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#include "frame.h"
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#include "ui-out.h"
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#include "inferior.h"
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#include "btrace.h"
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#include "common/vec.h"
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#include "target/waitstatus.h"
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#include "cli/cli-utils.h"
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/* Frontend view of the thread state. Possible extensions: stepping,
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finishing, until(ling),... */
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enum thread_state
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{
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THREAD_STOPPED,
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THREAD_RUNNING,
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THREAD_EXITED,
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};
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/* Inferior thread specific part of `struct infcall_control_state'.
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Inferior process counterpart is `struct inferior_control_state'. */
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struct thread_control_state
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{
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/* User/external stepping state. */
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/* Step-resume or longjmp-resume breakpoint. */
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struct breakpoint *step_resume_breakpoint;
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/* Exception-resume breakpoint. */
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struct breakpoint *exception_resume_breakpoint;
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/* Breakpoints used for software single stepping. Plural, because
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it may have multiple locations. E.g., if stepping over a
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conditional branch instruction we can't decode the condition for,
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we'll need to put a breakpoint at the branch destination, and
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another at the instruction after the branch. */
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struct breakpoint *single_step_breakpoints;
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/* Range to single step within.
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If this is nonzero, respond to a single-step signal by continuing
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to step if the pc is in this range.
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If step_range_start and step_range_end are both 1, it means to
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step for a single instruction (FIXME: it might clean up
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wait_for_inferior in a minor way if this were changed to the
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address of the instruction and that address plus one. But maybe
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not). */
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CORE_ADDR step_range_start; /* Inclusive */
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CORE_ADDR step_range_end; /* Exclusive */
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/* Function the thread was in as of last it started stepping. */
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struct symbol *step_start_function;
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/* If GDB issues a target step request, and this is nonzero, the
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target should single-step this thread once, and then continue
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single-stepping it without GDB core involvement as long as the
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thread stops in the step range above. If this is zero, the
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target should ignore the step range, and only issue one single
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step. */
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int may_range_step;
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/* Stack frame address as of when stepping command was issued.
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This is how we know when we step into a subroutine call, and how
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to set the frame for the breakpoint used to step out. */
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struct frame_id step_frame_id;
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/* Similarly, the frame ID of the underlying stack frame (skipping
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any inlined frames). */
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struct frame_id step_stack_frame_id;
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/* Nonzero if we are presently stepping over a breakpoint.
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If we hit a breakpoint or watchpoint, and then continue, we need
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to single step the current thread with breakpoints disabled, to
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avoid hitting the same breakpoint or watchpoint again. And we
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should step just a single thread and keep other threads stopped,
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so that other threads don't miss breakpoints while they are
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removed.
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So, this variable simultaneously means that we need to single
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step the current thread, keep other threads stopped, and that
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breakpoints should be removed while we step.
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This variable is set either:
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- in proceed, when we resume inferior on user's explicit request
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- in keep_going, if handle_inferior_event decides we need to
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step over breakpoint.
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The variable is cleared in normal_stop. The proceed calls
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wait_for_inferior, which calls handle_inferior_event in a loop,
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and until wait_for_inferior exits, this variable is changed only
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by keep_going. */
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int trap_expected;
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/* Nonzero if the thread is being proceeded for a "finish" command
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or a similar situation when return value should be printed. */
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int proceed_to_finish;
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/* Nonzero if the thread is being proceeded for an inferior function
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call. */
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int in_infcall;
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enum step_over_calls_kind step_over_calls;
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/* Nonzero if stopped due to a step command. */
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int stop_step;
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/* Chain containing status of breakpoint(s) the thread stopped
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at. */
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bpstat stop_bpstat;
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/* Whether the command that started the thread was a stepping
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command. This is used to decide whether "set scheduler-locking
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step" behaves like "on" or "off". */
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int stepping_command;
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};
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/* Inferior thread specific part of `struct infcall_suspend_state'. */
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struct thread_suspend_state
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{
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/* Last signal that the inferior received (why it stopped). When
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the thread is resumed, this signal is delivered. Note: the
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target should not check whether the signal is in pass state,
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because the signal may have been explicitly passed with the
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"signal" command, which overrides "handle nopass". If the signal
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should be suppressed, the core will take care of clearing this
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before the target is resumed. */
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enum gdb_signal stop_signal;
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/* The reason the thread last stopped, if we need to track it
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(breakpoint, watchpoint, etc.) */
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enum target_stop_reason stop_reason;
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/* The waitstatus for this thread's last event. */
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struct target_waitstatus waitstatus;
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/* If true WAITSTATUS hasn't been handled yet. */
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int waitstatus_pending_p;
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/* Record the pc of the thread the last time it stopped. (This is
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not the current thread's PC as that may have changed since the
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last stop, e.g., "return" command, or "p $pc = 0xf000"). This is
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used in coordination with stop_reason and waitstatus_pending_p:
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if the thread's PC is changed since it last stopped, a pending
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breakpoint waitstatus is discarded. */
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CORE_ADDR stop_pc;
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};
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typedef struct value *value_ptr;
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DEF_VEC_P (value_ptr);
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typedef VEC (value_ptr) value_vec;
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struct thread_info
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{
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public:
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explicit thread_info (inferior *inf, ptid_t ptid);
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~thread_info ();
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bool deletable () const
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{
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/* If this is the current thread, or there's code out there that
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relies on it existing (m_refcount > 0) we can't delete yet. */
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return (m_refcount == 0 && !ptid_equal (ptid, inferior_ptid));
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}
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/* Increase the refcount. */
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void incref ()
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{
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gdb_assert (m_refcount >= 0);
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m_refcount++;
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}
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/* Decrease the refcount. */
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void decref ()
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{
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m_refcount--;
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gdb_assert (m_refcount >= 0);
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}
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struct thread_info *next = NULL;
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ptid_t ptid; /* "Actual process id";
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In fact, this may be overloaded with
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kernel thread id, etc. */
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/* Each thread has two GDB IDs.
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a) The thread ID (Id). This consists of the pair of:
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- the number of the thread's inferior and,
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- the thread's thread number in its inferior, aka, the
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per-inferior thread number. This number is unique in the
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inferior but not unique between inferiors.
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b) The global ID (GId). This is a a single integer unique
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between all inferiors.
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E.g.:
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(gdb) info threads -gid
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Id GId Target Id Frame
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* 1.1 1 Thread A 0x16a09237 in foo () at foo.c:10
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1.2 3 Thread B 0x15ebc6ed in bar () at foo.c:20
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1.3 5 Thread C 0x15ebc6ed in bar () at foo.c:20
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2.1 2 Thread A 0x16a09237 in foo () at foo.c:10
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2.2 4 Thread B 0x15ebc6ed in bar () at foo.c:20
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2.3 6 Thread C 0x15ebc6ed in bar () at foo.c:20
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Above, both inferiors 1 and 2 have threads numbered 1-3, but each
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thread has its own unique global ID. */
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/* The thread's global GDB thread number. This is exposed to MI,
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Python/Scheme, visible with "info threads -gid", and is also what
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the $_gthread convenience variable is bound to. */
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int global_num;
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/* The per-inferior thread number. This is unique in the inferior
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the thread belongs to, but not unique between inferiors. This is
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what the $_thread convenience variable is bound to. */
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int per_inf_num;
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/* The inferior this thread belongs to. */
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struct inferior *inf;
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/* The name of the thread, as specified by the user. This is NULL
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if the thread does not have a user-given name. */
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char *name = NULL;
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/* Non-zero means the thread is executing. Note: this is different
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from saying that there is an active target and we are stopped at
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a breakpoint, for instance. This is a real indicator whether the
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thread is off and running. */
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int executing = 0;
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/* Non-zero if this thread is resumed from infrun's perspective.
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Note that a thread can be marked both as not-executing and
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resumed at the same time. This happens if we try to resume a
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thread that has a wait status pending. We shouldn't let the
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thread really run until that wait status has been processed, but
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we should not process that wait status if we didn't try to let
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the thread run. */
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int resumed = 0;
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/* Frontend view of the thread state. Note that the THREAD_RUNNING/
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THREAD_STOPPED states are different from EXECUTING. When the
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thread is stopped internally while handling an internal event,
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like a software single-step breakpoint, EXECUTING will be false,
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but STATE will still be THREAD_RUNNING. */
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enum thread_state state = THREAD_STOPPED;
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/* State of GDB control of inferior thread execution.
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See `struct thread_control_state'. */
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thread_control_state control {};
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/* State of inferior thread to restore after GDB is done with an inferior
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call. See `struct thread_suspend_state'. */
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thread_suspend_state suspend {};
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int current_line = 0;
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struct symtab *current_symtab = NULL;
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/* Internal stepping state. */
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/* Record the pc of the thread the last time it was resumed. (It
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can't be done on stop as the PC may change since the last stop,
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e.g., "return" command, or "p $pc = 0xf000"). This is maintained
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by proceed and keep_going, and among other things, it's used in
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adjust_pc_after_break to distinguish a hardware single-step
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SIGTRAP from a breakpoint SIGTRAP. */
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CORE_ADDR prev_pc = 0;
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/* Did we set the thread stepping a breakpoint instruction? This is
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used in conjunction with PREV_PC to decide whether to adjust the
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PC. */
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int stepped_breakpoint = 0;
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/* Should we step over breakpoint next time keep_going is called? */
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int stepping_over_breakpoint = 0;
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/* Should we step over a watchpoint next time keep_going is called?
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This is needed on targets with non-continuable, non-steppable
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watchpoints. */
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int stepping_over_watchpoint = 0;
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/* Set to TRUE if we should finish single-stepping over a breakpoint
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after hitting the current step-resume breakpoint. The context here
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is that GDB is to do `next' or `step' while signal arrives.
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When stepping over a breakpoint and signal arrives, GDB will attempt
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to skip signal handler, so it inserts a step_resume_breakpoint at the
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signal return address, and resume inferior.
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step_after_step_resume_breakpoint is set to TRUE at this moment in
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order to keep GDB in mind that there is still a breakpoint to step over
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when GDB gets back SIGTRAP from step_resume_breakpoint. */
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int step_after_step_resume_breakpoint = 0;
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/* Pointer to the state machine manager object that handles what is
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left to do for the thread's execution command after the target
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stops. Several execution commands use it. */
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struct thread_fsm *thread_fsm = NULL;
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/* This is used to remember when a fork or vfork event was caught by
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a catchpoint, and thus the event is to be followed at the next
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resume of the thread, and not immediately. */
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struct target_waitstatus pending_follow;
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/* True if this thread has been explicitly requested to stop. */
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int stop_requested = 0;
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/* The initiating frame of a nexting operation, used for deciding
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which exceptions to intercept. If it is null_frame_id no
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bp_longjmp or bp_exception but longjmp has been caught just for
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bp_longjmp_call_dummy. */
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struct frame_id initiating_frame = null_frame_id;
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/* Private data used by the target vector implementation. */
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struct private_thread_info *priv = NULL;
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/* Function that is called to free PRIVATE. If this is NULL, then
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xfree will be called on PRIVATE. */
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void (*private_dtor) (struct private_thread_info *) = NULL;
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/* Branch trace information for this thread. */
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struct btrace_thread_info btrace {};
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/* Flag which indicates that the stack temporaries should be stored while
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evaluating expressions. */
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int stack_temporaries_enabled = 0;
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/* Values that are stored as temporaries on stack while evaluating
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expressions. */
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value_vec *stack_temporaries = NULL;
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/* Step-over chain. A thread is in the step-over queue if these are
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non-NULL. If only a single thread is in the chain, then these
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fields point to self. */
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struct thread_info *step_over_prev = NULL;
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struct thread_info *step_over_next = NULL;
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private:
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/* If this is > 0, then it means there's code out there that relies
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on this thread being listed. Don't delete it from the lists even
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if we detect it exiting. */
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int m_refcount = 0;
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};
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/* Create an empty thread list, or empty the existing one. */
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extern void init_thread_list (void);
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/* Add a thread to the thread list, print a message
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that a new thread is found, and return the pointer to
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the new thread. Caller my use this pointer to
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initialize the private thread data. */
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extern struct thread_info *add_thread (ptid_t ptid);
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/* Same as add_thread, but does not print a message
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about new thread. */
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extern struct thread_info *add_thread_silent (ptid_t ptid);
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/* Same as add_thread, and sets the private info. */
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extern struct thread_info *add_thread_with_info (ptid_t ptid,
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struct private_thread_info *);
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/* Delete an existing thread list entry. */
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extern void delete_thread (ptid_t);
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/* Delete an existing thread list entry, and be quiet about it. Used
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after the process this thread having belonged to having already
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exited, for example. */
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extern void delete_thread_silent (ptid_t);
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/* Delete a step_resume_breakpoint from the thread database. */
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extern void delete_step_resume_breakpoint (struct thread_info *);
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/* Delete an exception_resume_breakpoint from the thread database. */
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extern void delete_exception_resume_breakpoint (struct thread_info *);
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/* Delete the single-step breakpoints of thread TP, if any. */
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extern void delete_single_step_breakpoints (struct thread_info *tp);
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/* Check if the thread has software single stepping breakpoints
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set. */
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extern int thread_has_single_step_breakpoints_set (struct thread_info *tp);
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/* Check whether the thread has software single stepping breakpoints
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set at PC. */
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extern int thread_has_single_step_breakpoint_here (struct thread_info *tp,
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struct address_space *aspace,
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CORE_ADDR addr);
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/* Translate the global integer thread id (GDB's homegrown id, not the
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system's) into a "pid" (which may be overloaded with extra thread
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information). */
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extern ptid_t global_thread_id_to_ptid (int num);
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/* Translate a 'pid' (which may be overloaded with extra thread
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information) into the global integer thread id (GDB's homegrown id,
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not the system's). */
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extern int ptid_to_global_thread_id (ptid_t ptid);
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/* Returns whether to show inferior-qualified thread IDs, or plain
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thread numbers. Inferior-qualified IDs are shown whenever we have
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multiple inferiors, or the only inferior left has number > 1. */
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extern int show_inferior_qualified_tids (void);
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/* Return a string version of THR's thread ID. If there are multiple
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inferiors, then this prints the inferior-qualifier form, otherwise
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it only prints the thread number. The result is stored in a
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circular static buffer, NUMCELLS deep. */
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const char *print_thread_id (struct thread_info *thr);
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/* Boolean test for an already-known pid (which may be overloaded with
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extra thread information). */
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extern int in_thread_list (ptid_t ptid);
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/* Boolean test for an already-known global thread id (GDB's homegrown
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global id, not the system's). */
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extern int valid_global_thread_id (int global_id);
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/* Search function to lookup a thread by 'pid'. */
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extern struct thread_info *find_thread_ptid (ptid_t ptid);
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/* Find thread by GDB global thread ID. */
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struct thread_info *find_thread_global_id (int global_id);
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/* Finds the first thread of the inferior given by PID. If PID is -1,
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returns the first thread in the list. */
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struct thread_info *first_thread_of_process (int pid);
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/* Returns any thread of process PID, giving preference to the current
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thread. */
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extern struct thread_info *any_thread_of_process (int pid);
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/* Returns any non-exited thread of process PID, giving preference to
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the current thread, and to not executing threads. */
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extern struct thread_info *any_live_thread_of_process (int pid);
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/* Change the ptid of thread OLD_PTID to NEW_PTID. */
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void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
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/* Iterator function to call a user-provided callback function
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once for each known thread. */
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typedef int (*thread_callback_func) (struct thread_info *, void *);
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extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
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/* Traverse all threads. */
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#define ALL_THREADS(T) \
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for (T = thread_list; T; T = T->next) \
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/* Traverse over all threads, sorted by inferior. */
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#define ALL_THREADS_BY_INFERIOR(inf, tp) \
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ALL_INFERIORS (inf) \
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ALL_THREADS (tp) \
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if (inf == tp->inf)
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/* Traverse all threads, except those that have THREAD_EXITED
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state. */
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#define ALL_NON_EXITED_THREADS(T) \
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for (T = thread_list; T; T = T->next) \
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if ((T)->state != THREAD_EXITED)
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/* Traverse all threads, including those that have THREAD_EXITED
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state. Allows deleting the currently iterated thread. */
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#define ALL_THREADS_SAFE(T, TMP) \
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for ((T) = thread_list; \
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(T) != NULL ? ((TMP) = (T)->next, 1): 0; \
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(T) = (TMP))
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extern int thread_count (void);
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/* Switch from one thread to another. Also sets the STOP_PC
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global. */
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extern void switch_to_thread (ptid_t ptid);
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/* Switch from one thread to another. Does not read registers and
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sets STOP_PC to -1. */
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extern void switch_to_thread_no_regs (struct thread_info *thread);
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/* Marks or clears thread(s) PTID as resumed. If PTID is
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MINUS_ONE_PTID, applies to all threads. If ptid_is_pid(PTID) is
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true, applies to all threads of the process pointed at by PTID. */
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extern void set_resumed (ptid_t ptid, int resumed);
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/* Marks thread PTID is running, or stopped.
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If PTID is minus_one_ptid, marks all threads. */
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extern void set_running (ptid_t ptid, int running);
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/* Marks or clears thread(s) PTID as having been requested to stop.
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If PTID is MINUS_ONE_PTID, applies to all threads. If
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ptid_is_pid(PTID) is true, applies to all threads of the process
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pointed at by PTID. If STOP, then the THREAD_STOP_REQUESTED
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observer is called with PTID as argument. */
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extern void set_stop_requested (ptid_t ptid, int stop);
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/* NOTE: Since the thread state is not a boolean, most times, you do
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not want to check it with negation. If you really want to check if
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the thread is stopped,
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use (good):
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if (is_stopped (ptid))
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instead of (bad):
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if (!is_running (ptid))
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The latter also returns true on exited threads, most likelly not
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what you want. */
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/* Reports if in the frontend's perpective, thread PTID is running. */
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extern int is_running (ptid_t ptid);
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/* Is this thread listed, but known to have exited? We keep it listed
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(but not visible) until it's safe to delete. */
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extern int is_exited (ptid_t ptid);
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/* In the frontend's perpective, is this thread stopped? */
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extern int is_stopped (ptid_t ptid);
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/* Marks thread PTID as executing, or not. If PTID is minus_one_ptid,
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marks all threads.
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Note that this is different from the running state. See the
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description of state and executing fields of struct
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thread_info. */
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extern void set_executing (ptid_t ptid, int executing);
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/* Reports if thread PTID is executing. */
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extern int is_executing (ptid_t ptid);
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/* True if any (known or unknown) thread is or may be executing. */
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extern int threads_are_executing (void);
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/* Merge the executing property of thread PTID over to its thread
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state property (frontend running/stopped view).
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"not executing" -> "stopped"
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"executing" -> "running"
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"exited" -> "exited"
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If PTID is minus_one_ptid, go over all threads.
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Notifications are only emitted if the thread state did change. */
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extern void finish_thread_state (ptid_t ptid);
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/* Same as FINISH_THREAD_STATE, but with an interface suitable to be
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registered as a cleanup. PTID_P points to the ptid_t that is
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passed to FINISH_THREAD_STATE. */
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extern void finish_thread_state_cleanup (void *ptid_p);
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/* Commands with a prefix of `thread'. */
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extern struct cmd_list_element *thread_cmd_list;
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extern void thread_command (char *tidstr, int from_tty);
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/* Print notices on thread events (attach, detach, etc.), set with
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`set print thread-events'. */
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extern int print_thread_events;
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/* Prints the list of threads and their details on UIOUT. If
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REQUESTED_THREADS, a list of GDB ids/ranges, is not NULL, only
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print threads whose ID is included in the list. If PID is not -1,
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only print threads from the process PID. Otherwise, threads from
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all attached PIDs are printed. If both REQUESTED_THREADS is not
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NULL and PID is not -1, then the thread is printed if it belongs to
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the specified process. Otherwise, an error is raised. */
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extern void print_thread_info (struct ui_out *uiout, char *requested_threads,
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int pid);
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extern struct cleanup *make_cleanup_restore_current_thread (void);
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/* Returns a pointer into the thread_info corresponding to
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INFERIOR_PTID. INFERIOR_PTID *must* be in the thread list. */
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extern struct thread_info* inferior_thread (void);
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extern void update_thread_list (void);
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/* Delete any thread the target says is no longer alive. */
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extern void prune_threads (void);
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/* Delete threads marked THREAD_EXITED. Unlike prune_threads, this
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does not consult the target about whether the thread is alive right
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now. */
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extern void delete_exited_threads (void);
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/* Return true if PC is in the stepping range of THREAD. */
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int pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread);
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extern struct cleanup *enable_thread_stack_temporaries (ptid_t ptid);
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extern int thread_stack_temporaries_enabled_p (ptid_t ptid);
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extern void push_thread_stack_temporary (ptid_t ptid, struct value *v);
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extern struct value *get_last_thread_stack_temporary (ptid_t);
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extern int value_in_thread_stack_temporaries (struct value *, ptid_t);
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/* Add TP to the end of its inferior's pending step-over chain. */
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extern void thread_step_over_chain_enqueue (struct thread_info *tp);
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/* Remove TP from its inferior's pending step-over chain. */
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extern void thread_step_over_chain_remove (struct thread_info *tp);
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/* Return the next thread in the step-over chain starting at TP. NULL
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if TP is the last entry in the chain. */
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extern struct thread_info *thread_step_over_chain_next (struct thread_info *tp);
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/* Return true if TP is in the step-over chain. */
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extern int thread_is_in_step_over_chain (struct thread_info *tp);
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/* Cancel any ongoing execution command. */
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extern void thread_cancel_execution_command (struct thread_info *thr);
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/* Check whether it makes sense to access a register of the current
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thread at this point. If not, throw an error (e.g., the thread is
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executing). */
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extern void validate_registers_access (void);
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/* Check whether it makes sense to access a register of PTID at this point.
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Returns true if registers may be accessed; false otherwise. */
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extern bool can_access_registers_ptid (ptid_t ptid);
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/* Returns whether to show which thread hit the breakpoint, received a
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signal, etc. and ended up causing a user-visible stop. This is
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true iff we ever detected multiple threads. */
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extern int show_thread_that_caused_stop (void);
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/* Print the message for a thread or/and frame selected. */
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extern void print_selected_thread_frame (struct ui_out *uiout,
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user_selected_what selection);
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extern struct thread_info *thread_list;
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#endif /* GDBTHREAD_H */
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