along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "displaced-stepping.h"
+#include "gdbsupport/common-defs.h"
+#include "gdbsupport/common-utils.h"
#include "infrun.h"
#include <ctype.h>
#include "symtab.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "target.h"
+#include "target-connection.h"
#include "gdbthread.h"
#include "annotate.h"
#include "symfile.h"
#include "top.h"
#include "inf-loop.h"
#include "regcache.h"
+#include "utils.h"
#include "value.h"
#include "observable.h"
#include "language.h"
#include "target-dcache.h"
#include "terminal.h"
#include "solist.h"
-#include "event-loop.h"
+#include "gdbsupport/event-loop.h"
#include "thread-fsm.h"
#include "gdbsupport/enum-flags.h"
#include "progspace-and-thread.h"
#include "arch-utils.h"
#include "gdbsupport/scope-exit.h"
#include "gdbsupport/forward-scope-exit.h"
+#include "gdbsupport/gdb_select.h"
+#include <unordered_map>
+#include "async-event.h"
/* Prototypes for local functions */
static void sig_print_header (void);
-static int follow_fork (void);
-
-static int follow_fork_inferior (int follow_child, int detach_fork);
-
static void follow_inferior_reset_breakpoints (void);
static int currently_stepping (struct thread_info *tp);
-void nullify_last_target_wait_ptid (void);
-
static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *);
static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
static void resume (gdb_signal sig);
+static void wait_for_inferior (inferior *inf);
+
/* Asynchronous signal handler registered as event loop source for
when we have pending events ready to be passed to the core. */
static struct async_event_handler *infrun_async_inferior_event_token;
Starts off as -1, indicating "never enabled/disabled". */
static int infrun_is_async = -1;
+#define infrun_log_debug(fmt, args...) \
+ infrun_log_debug_1 (__LINE__, __func__, fmt, ##args)
+
+static void ATTRIBUTE_PRINTF(3, 4)
+infrun_log_debug_1 (int line, const char *func,
+ const char *fmt, ...)
+{
+ if (debug_infrun)
+ {
+ va_list args;
+ va_start (args, fmt);
+ std::string msg = string_vprintf (fmt, args);
+ va_end (args);
+
+ fprintf_unfiltered (gdb_stdout, "infrun: %s: %s\n", func, msg.c_str ());
+ }
+}
+
/* See infrun.h. */
void
{
infrun_is_async = enable;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: infrun_async(%d)\n",
- enable);
+ infrun_log_debug ("enable=%d", enable);
if (enable)
mark_async_event_handler (infrun_async_inferior_event_token);
static int stop_print_frame;
-/* This is a cached copy of the pid/waitstatus of the last event
- returned by target_wait()/deprecated_target_wait_hook(). This
- information is returned by get_last_target_status(). */
+/* This is a cached copy of the target/ptid/waitstatus of the last
+ event returned by target_wait()/deprecated_target_wait_hook().
+ This information is returned by get_last_target_status(). */
+static process_stratum_target *target_last_proc_target;
static ptid_t target_last_wait_ptid;
static struct target_waitstatus target_last_waitstatus;
the fork parent. At return inferior_ptid is the ptid of the
followed inferior. */
-static int
-follow_fork_inferior (int follow_child, int detach_fork)
+static bool
+follow_fork_inferior (bool follow_child, bool detach_fork)
{
int has_vforked;
ptid_t parent_ptid, child_ptid;
scoped_restore_current_pspace_and_thread restore_pspace_thread;
- inferior_ptid = child_ptid;
- add_thread_silent (inferior_ptid);
set_current_inferior (child_inf);
+ switch_to_no_thread ();
child_inf->symfile_flags = SYMFILE_NO_READ;
+ push_target (parent_inf->process_target ());
+ add_thread_silent (child_inf->process_target (), child_ptid);
+ inferior_ptid = child_ptid;
/* If this is a vfork child, then the address-space is
shared with the parent. */
child_inf->pspace = parent_inf->pspace;
child_inf->aspace = parent_inf->aspace;
+ exec_on_vfork ();
+
/* The parent will be frozen until the child is done
with the shared region. Keep track of the
parent. */
parent_pspace = parent_inf->pspace;
- /* If we're vforking, we want to hold on to the parent until the
- child exits or execs. At child exec or exit time we can
- remove the old breakpoints from the parent and detach or
- resume debugging it. Otherwise, detach the parent now; we'll
- want to reuse it's program/address spaces, but we can't set
- them to the child before removing breakpoints from the
- parent, otherwise, the breakpoints module could decide to
- remove breakpoints from the wrong process (since they'd be
- assigned to the same address space). */
+ process_stratum_target *target = parent_inf->process_target ();
- if (has_vforked)
- {
- gdb_assert (child_inf->vfork_parent == NULL);
- gdb_assert (parent_inf->vfork_child == NULL);
- child_inf->vfork_parent = parent_inf;
- child_inf->pending_detach = 0;
- parent_inf->vfork_child = child_inf;
- parent_inf->pending_detach = detach_fork;
- parent_inf->waiting_for_vfork_done = 0;
- }
- else if (detach_fork)
- {
- if (print_inferior_events)
- {
- /* Ensure that we have a process ptid. */
- ptid_t process_ptid = ptid_t (parent_ptid.pid ());
+ {
+ /* Hold a strong reference to the target while (maybe)
+ detaching the parent. Otherwise detaching could close the
+ target. */
+ auto target_ref = target_ops_ref::new_reference (target);
+
+ /* If we're vforking, we want to hold on to the parent until
+ the child exits or execs. At child exec or exit time we
+ can remove the old breakpoints from the parent and detach
+ or resume debugging it. Otherwise, detach the parent now;
+ we'll want to reuse it's program/address spaces, but we
+ can't set them to the child before removing breakpoints
+ from the parent, otherwise, the breakpoints module could
+ decide to remove breakpoints from the wrong process (since
+ they'd be assigned to the same address space). */
+
+ if (has_vforked)
+ {
+ gdb_assert (child_inf->vfork_parent == NULL);
+ gdb_assert (parent_inf->vfork_child == NULL);
+ child_inf->vfork_parent = parent_inf;
+ child_inf->pending_detach = 0;
+ parent_inf->vfork_child = child_inf;
+ parent_inf->pending_detach = detach_fork;
+ parent_inf->waiting_for_vfork_done = 0;
+ }
+ else if (detach_fork)
+ {
+ if (print_inferior_events)
+ {
+ /* Ensure that we have a process ptid. */
+ ptid_t process_ptid = ptid_t (parent_ptid.pid ());
+
+ target_terminal::ours_for_output ();
+ fprintf_filtered (gdb_stdlog,
+ _("[Detaching after fork from "
+ "parent %s]\n"),
+ target_pid_to_str (process_ptid).c_str ());
+ }
- target_terminal::ours_for_output ();
- fprintf_filtered (gdb_stdlog,
- _("[Detaching after fork from "
- "parent %s]\n"),
- target_pid_to_str (process_ptid).c_str ());
- }
+ target_detach (parent_inf, 0);
+ parent_inf = NULL;
+ }
- target_detach (parent_inf, 0);
- }
+ /* Note that the detach above makes PARENT_INF dangling. */
- /* Note that the detach above makes PARENT_INF dangling. */
+ /* Add the child thread to the appropriate lists, and switch
+ to this new thread, before cloning the program space, and
+ informing the solib layer about this new process. */
- /* Add the child thread to the appropriate lists, and switch to
- this new thread, before cloning the program space, and
- informing the solib layer about this new process. */
+ set_current_inferior (child_inf);
+ push_target (target);
+ }
+ add_thread_silent (target, child_ptid);
inferior_ptid = child_ptid;
- add_thread_silent (inferior_ptid);
- set_current_inferior (child_inf);
/* If this is a vfork child, then the address-space is shared
with the parent. If we detached from the parent, then we can
{
child_inf->pspace = parent_pspace;
child_inf->aspace = child_inf->pspace->aspace;
+
+ exec_on_vfork ();
}
else
{
if the inferior should be resumed; false, if the target for some
reason decided it's best not to resume. */
-static int
-follow_fork (void)
+static bool
+follow_fork ()
{
- int follow_child = (follow_fork_mode_string == follow_fork_mode_child);
- int should_resume = 1;
+ bool follow_child = (follow_fork_mode_string == follow_fork_mode_child);
+ bool should_resume = true;
struct thread_info *tp;
/* Copy user stepping state to the new inferior thread. FIXME: the
struct breakpoint *exception_resume_breakpoint = NULL;
CORE_ADDR step_range_start = 0;
CORE_ADDR step_range_end = 0;
+ int current_line = 0;
+ symtab *current_symtab = NULL;
struct frame_id step_frame_id = { 0 };
struct thread_fsm *thread_fsm = NULL;
if (!non_stop)
{
+ process_stratum_target *wait_target;
ptid_t wait_ptid;
struct target_waitstatus wait_status;
/* Get the last target status returned by target_wait(). */
- get_last_target_status (&wait_ptid, &wait_status);
+ get_last_target_status (&wait_target, &wait_ptid, &wait_status);
/* If not stopped at a fork event, then there's nothing else to
do. */
/* Check if we switched over from WAIT_PTID, since the event was
reported. */
if (wait_ptid != minus_one_ptid
- && inferior_ptid != wait_ptid)
+ && (current_inferior ()->process_target () != wait_target
+ || inferior_ptid != wait_ptid))
{
/* We did. Switch back to WAIT_PTID thread, to tell the
target to follow it (in either direction). We'll
afterwards refuse to resume, and inform the user what
happened. */
- thread_info *wait_thread
- = find_thread_ptid (wait_ptid);
+ thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid);
switch_to_thread (wait_thread);
- should_resume = 0;
+ should_resume = false;
}
}
(tp->control.step_resume_breakpoint);
step_range_start = tp->control.step_range_start;
step_range_end = tp->control.step_range_end;
+ current_line = tp->current_line;
+ current_symtab = tp->current_symtab;
step_frame_id = tp->control.step_frame_id;
exception_resume_breakpoint
= clone_momentary_breakpoint (tp->control.exception_resume_breakpoint);
parent = inferior_ptid;
child = tp->pending_follow.value.related_pid;
+ process_stratum_target *parent_targ = tp->inf->process_target ();
/* Set up inferior(s) as specified by the caller, and tell the
target to do whatever is necessary to follow either parent
or child. */
or another. The previous selected thread may be gone
from the lists by now, but if it is still around, need
to clear the pending follow request. */
- tp = find_thread_ptid (parent);
+ tp = find_thread_ptid (parent_targ, parent);
if (tp)
tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
/* If we followed the child, switch to it... */
if (follow_child)
{
- thread_info *child_thr = find_thread_ptid (child);
+ thread_info *child_thr = find_thread_ptid (parent_targ, child);
switch_to_thread (child_thr);
/* ... and preserve the stepping state, in case the
= step_resume_breakpoint;
tp->control.step_range_start = step_range_start;
tp->control.step_range_end = step_range_end;
+ tp->current_line = current_line;
+ tp->current_symtab = current_symtab;
tp->control.step_frame_id = step_frame_id;
tp->control.exception_resume_breakpoint
= exception_resume_breakpoint;
&& !thread->stop_requested
&& thread->suspend.stop_signal == GDB_SIGNAL_0)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resuming vfork parent thread %s\n",
- target_pid_to_str (thread->ptid).c_str ());
+ infrun_log_debug ("resuming vfork parent thread %s",
+ target_pid_to_str (thread->ptid).c_str ());
switch_to_thread (thread);
clear_proceed_status (0);
}
else
{
- struct program_space *pspace;
-
/* If this is a vfork child exiting, then the pspace and
aspaces were shared with the parent. Since we're
reporting the process exit, we'll be mourning all that is
scoped_restore restore_ptid
= make_scoped_restore (&inferior_ptid, null_ptid);
- /* This inferior is dead, so avoid giving the breakpoints
- module the option to write through to it (cloning a
- program space resets breakpoints). */
- inf->aspace = NULL;
- inf->pspace = NULL;
- pspace = new program_space (maybe_new_address_space ());
- set_current_program_space (pspace);
+ inf->pspace = new program_space (maybe_new_address_space ());
+ inf->aspace = inf->pspace->aspace;
+ set_current_program_space (inf->pspace);
inf->removable = 1;
inf->symfile_flags = SYMFILE_NO_READ;
- clone_program_space (pspace, vfork_parent->pspace);
- inf->pspace = pspace;
- inf->aspace = pspace->aspace;
+ clone_program_space (inf->pspace, vfork_parent->pspace);
resume_parent = vfork_parent->pid;
}
free now. */
scoped_restore_current_thread restore_thread;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resuming vfork parent process %d\n",
- resume_parent);
+ infrun_log_debug ("resuming vfork parent process %d",
+ resume_parent);
iterate_over_threads (proceed_after_vfork_done, &resume_parent);
}
inf->pid = pid;
target_follow_exec (inf, exec_file_target);
- set_current_inferior (inf);
- set_current_program_space (inf->pspace);
- add_thread (ptid);
+ inferior *org_inferior = current_inferior ();
+ switch_to_inferior_no_thread (inf);
+ push_target (org_inferior->process_target ());
+ thread_info *thr = add_thread (inf->process_target (), ptid);
+ switch_to_thread (thr);
}
else
{
to symbol_file_command...). */
insert_breakpoints ();
+ gdb::observers::inferior_execd.notify (inf);
+
/* The next resume of this inferior should bring it to the shlib
startup breakpoints. (If the user had also set bp's on
"main" from the old (parent) process, then they'll auto-
to avoid starvation, otherwise, we could e.g., find ourselves
constantly stepping the same couple threads past their breakpoints
over and over, if the single-step finish fast enough. */
-struct thread_info *step_over_queue_head;
+struct thread_info *global_thread_step_over_chain_head;
/* Bit flags indicating what the thread needs to step over. */
static void
clear_step_over_info (void)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: clear_step_over_info\n");
+ infrun_log_debug ("clearing step over info");
step_over_info.aspace = NULL;
step_over_info.address = 0;
step_over_info.nonsteppable_watchpoint_p = 0;
displaced step operation on it. See displaced_step_prepare and
displaced_step_fixup for details. */
-/* Default destructor for displaced_step_closure. */
-
-displaced_step_closure::~displaced_step_closure () = default;
-
-/* Get the displaced stepping state of process PID. */
+/* Get the displaced stepping state of inferior INF. */
static displaced_step_inferior_state *
get_displaced_stepping_state (inferior *inf)
return &inf->displaced_step_state;
}
-/* Returns true if any inferior has a thread doing a displaced
- step. */
+/* Get the displaced stepping state of thread THREAD. */
-static bool
-displaced_step_in_progress_any_inferior ()
+static displaced_step_thread_state *
+get_displaced_stepping_state (thread_info *thread)
{
- for (inferior *i : all_inferiors ())
- {
- if (i->displaced_step_state.step_thread != nullptr)
- return true;
- }
-
- return false;
+ return &thread->displaced_step_state;
}
-/* Return true if thread represented by PTID is doing a displaced
- step. */
+/* Return true if the given thread is doing a displaced step. */
-static int
-displaced_step_in_progress_thread (thread_info *thread)
+static bool
+displaced_step_in_progress (thread_info *thread)
{
gdb_assert (thread != NULL);
- return get_displaced_stepping_state (thread->inf)->step_thread == thread;
+ return get_displaced_stepping_state (thread)->in_progress ();
}
-/* Return true if process PID has a thread doing a displaced step. */
+/* Return true if any thread of this inferior is doing a displaced step. */
-static int
+static bool
displaced_step_in_progress (inferior *inf)
{
- return get_displaced_stepping_state (inf)->step_thread != nullptr;
+ for (thread_info *thread : inf->non_exited_threads ())
+ {
+ if (displaced_step_in_progress (thread))
+ return true;
+ }
+
+ return false;
}
-/* If inferior is in displaced stepping, and ADDR equals to starting address
- of copy area, return corresponding displaced_step_closure. Otherwise,
- return NULL. */
+/* Return true if any thread is doing a displaced step. */
-struct displaced_step_closure*
-get_displaced_step_closure_by_addr (CORE_ADDR addr)
+static bool
+displaced_step_in_progress_any_thread ()
{
- displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (current_inferior ());
+ for (thread_info *thread : all_non_exited_threads ())
+ {
+ if (displaced_step_in_progress (thread))
+ return true;
+ }
+
+ return false;
+}
- /* If checking the mode of displaced instruction in copy area. */
- if (displaced->step_thread != nullptr
- && displaced->step_copy == addr)
- return displaced->step_closure;
+/* If inferior is in displaced stepping, and ADDR equals to starting address
+ of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise,
+ return NULL. */
+struct displaced_step_copy_insn_closure *
+get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr)
+{
+// FIXME: implement me (only needed on ARM).
+// displaced_step_inferior_state *displaced
+// = get_displaced_stepping_state (current_inferior ());
+//
+// /* If checking the mode of displaced instruction in copy area. */
+// if (displaced->step_thread != nullptr
+// && displaced->step_copy == addr)
+// return displaced->step_closure.get ();
+//
return NULL;
}
doesn't support it, GDB will instead use the traditional
hold-and-step approach. If AUTO (which is the default), GDB will
decide which technique to use to step over breakpoints depending on
- which of all-stop or non-stop mode is active --- displaced stepping
- in non-stop mode; hold-and-step in all-stop mode. */
+ whether the target works in a non-stop way (see use_displaced_stepping). */
static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO;
"to step over breakpoints is %s.\n"), value);
}
+/* Return true if the target behing THREAD supports displaced stepping. */
+
+static bool
+target_supports_displaced_stepping (thread_info *thread)
+{
+ inferior *inf = thread->inf;
+ target_ops *target = inf->top_target ();
+
+ return target->supports_displaced_step (thread);
+}
+
/* Return non-zero if displaced stepping can/should be used to step
over breakpoints of thread TP. */
-static int
-use_displaced_stepping (struct thread_info *tp)
+static bool
+use_displaced_stepping (thread_info *tp)
{
- struct regcache *regcache = get_thread_regcache (tp);
- struct gdbarch *gdbarch = regcache->arch ();
+ /* If the user disabled it explicitly, don't use displaced stepping. */
+ if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE)
+ return false;
+
+ /* If "auto", only use displaced stepping if the target operates in a non-stop
+ way. */
+ if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO
+ && !target_is_non_stop_p ())
+ return false;
+
+ /* If the target doesn't support displaced stepping, don't use it. */
+ if (!target_supports_displaced_stepping (tp))
+ return false;
+
+ /* If recording, don't use displaced stepping. */
+ if (find_record_target () != nullptr)
+ return false;
+
displaced_step_inferior_state *displaced_state
= get_displaced_stepping_state (tp->inf);
- return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO
- && target_is_non_stop_p ())
- || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE)
- && gdbarch_displaced_step_copy_insn_p (gdbarch)
- && find_record_target () == NULL
- && !displaced_state->failed_before);
+ /* If displaced stepping failed before for this inferior, don't bother trying
+ again. */
+ if (displaced_state->failed_before)
+ return false;
+
+ return true;
}
-/* Clean out any stray displaced stepping state. */
+/* Simple function wrapper around displaced_step_thread_state::reset. */
+
static void
-displaced_step_clear (struct displaced_step_inferior_state *displaced)
+displaced_step_reset (displaced_step_thread_state *displaced)
{
- /* Indicate that there is no cleanup pending. */
- displaced->step_thread = nullptr;
-
- delete displaced->step_closure;
- displaced->step_closure = NULL;
+ displaced->reset ();
}
-/* A cleanup that wraps displaced_step_clear. */
-using displaced_step_clear_cleanup
- = FORWARD_SCOPE_EXIT (displaced_step_clear);
+/* A cleanup that wraps displaced_step_reset. We use this instead of, say,
+ SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */
+
+using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset);
/* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
void
stepped now; 0 if displaced stepping this thread got queued; or -1
if this instruction can't be displaced stepped. */
-static int
+static displaced_step_prepare_status
displaced_step_prepare_throw (thread_info *tp)
{
regcache *regcache = get_thread_regcache (tp);
struct gdbarch *gdbarch = regcache->arch ();
- const address_space *aspace = regcache->aspace ();
- CORE_ADDR original, copy;
- ULONGEST len;
- struct displaced_step_closure *closure;
- int status;
+ displaced_step_thread_state *thread_disp_step_state
+ = get_displaced_stepping_state (tp);
- /* We should never reach this function if the architecture does not
+ /* We should never reach this function if the target does not
support displaced stepping. */
- gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch));
+ gdb_assert (target_supports_displaced_stepping (tp));
/* Nor if the thread isn't meant to step over a breakpoint. */
gdb_assert (tp->control.trap_expected);
jump/branch). */
tp->control.may_range_step = 0;
- /* We have to displaced step one thread at a time, as we only have
- access to a single scratch space per inferior. */
-
- displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (tp->inf);
-
- if (displaced->step_thread != nullptr)
- {
- /* Already waiting for a displaced step to finish. Defer this
- request and place in queue. */
-
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: deferring step of %s\n",
- target_pid_to_str (tp->ptid).c_str ());
-
- thread_step_over_chain_enqueue (tp);
- return 0;
- }
- else
- {
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: stepping %s now\n",
- target_pid_to_str (tp->ptid).c_str ());
- }
-
- displaced_step_clear (displaced);
+ /* We are about to start a displaced step for this thread, if one is already
+ in progress, we goofed up somewhere. */
+ gdb_assert (!thread_disp_step_state->in_progress ());
scoped_restore_current_thread restore_thread;
switch_to_thread (tp);
- original = regcache_read_pc (regcache);
+ CORE_ADDR original_pc = regcache_read_pc (regcache);
- copy = gdbarch_displaced_step_location (gdbarch);
- len = gdbarch_max_insn_length (gdbarch);
+ displaced_step_prepare_status status =
+ tp->inf->top_target ()->displaced_step_prepare (tp);
- if (breakpoint_in_range_p (aspace, copy, len))
+ if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR)
{
- /* There's a breakpoint set in the scratch pad location range
- (which is usually around the entry point). We'd either
- install it before resuming, which would overwrite/corrupt the
- scratch pad, or if it was already inserted, this displaced
- step would overwrite it. The latter is OK in the sense that
- we already assume that no thread is going to execute the code
- in the scratch pad range (after initial startup) anyway, but
- the former is unacceptable. Simply punt and fallback to
- stepping over this breakpoint in-line. */
if (debug_displaced)
- {
- fprintf_unfiltered (gdb_stdlog,
- "displaced: breakpoint set in scratch pad. "
- "Stepping over breakpoint in-line instead.\n");
- }
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: failed to prepare (%s)",
+ target_pid_to_str (tp->ptid).c_str ());
- return -1;
+ return DISPLACED_STEP_PREPARE_STATUS_ERROR;
}
-
- /* Save the original contents of the copy area. */
- displaced->step_saved_copy.resize (len);
- status = target_read_memory (copy, displaced->step_saved_copy.data (), len);
- if (status != 0)
- throw_error (MEMORY_ERROR,
- _("Error accessing memory address %s (%s) for "
- "displaced-stepping scratch space."),
- paddress (gdbarch, copy), safe_strerror (status));
- if (debug_displaced)
+ else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
{
- fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ",
- paddress (gdbarch, copy));
- displaced_step_dump_bytes (gdb_stdlog,
- displaced->step_saved_copy.data (),
- len);
- };
+ /* Not enough displaced stepping resources available, defer this
+ request by placing it the queue. */
- closure = gdbarch_displaced_step_copy_insn (gdbarch,
- original, copy, regcache);
- if (closure == NULL)
- {
- /* The architecture doesn't know how or want to displaced step
- this instruction or instruction sequence. Fallback to
- stepping over the breakpoint in-line. */
- return -1;
- }
+ if (debug_displaced)
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: not enough resources available, "
+ "deferring step of %s\n",
+ target_pid_to_str (tp->ptid).c_str ());
+
+ global_thread_step_over_chain_enqueue (tp);
+ tp->inf->displaced_step_state.unavailable = true;
+
+ return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
+ }
+
+ gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK);
+
+// FIXME: Should probably replicated in the arch implementation now.
+//
+// if (breakpoint_in_range_p (aspace, copy, len))
+// {
+// /* There's a breakpoint set in the scratch pad location range
+// (which is usually around the entry point). We'd either
+// install it before resuming, which would overwrite/corrupt the
+// scratch pad, or if it was already inserted, this displaced
+// step would overwrite it. The latter is OK in the sense that
+// we already assume that no thread is going to execute the code
+// in the scratch pad range (after initial startup) anyway, but
+// the former is unacceptable. Simply punt and fallback to
+// stepping over this breakpoint in-line. */
+// if (debug_displaced)
+// {
+// fprintf_unfiltered (gdb_stdlog,
+// "displaced: breakpoint set in scratch pad. "
+// "Stepping over breakpoint in-line instead.\n");
+// }
+//
+// gdb_assert (false);
+// gdbarch_displaced_step_release_location (gdbarch, copy);
+//
+// return -1;
+// }
/* Save the information we need to fix things up if the step
succeeds. */
- displaced->step_thread = tp;
- displaced->step_gdbarch = gdbarch;
- displaced->step_closure = closure;
- displaced->step_original = original;
- displaced->step_copy = copy;
+ thread_disp_step_state->set (gdbarch);
- {
- displaced_step_clear_cleanup cleanup (displaced);
-
- /* Resume execution at the copy. */
- regcache_write_pc (regcache, copy);
-
- cleanup.release ();
- }
+ // FIXME: get it from _prepare?
+ CORE_ADDR displaced_pc = 0;
if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n",
- paddress (gdbarch, copy));
+ fprintf_unfiltered (gdb_stdlog,
+ "displaced: prepared successfully thread=%s, "
+ "original_pc=%s, displaced_pc=%s\n",
+ target_pid_to_str (tp->ptid).c_str (),
+ paddress (gdbarch, original_pc),
+ paddress (gdbarch, displaced_pc));
- return 1;
+ return DISPLACED_STEP_PREPARE_STATUS_OK;
}
/* Wrapper for displaced_step_prepare_throw that disabled further
attempts at displaced stepping if we get a memory error. */
-static int
+static displaced_step_prepare_status
displaced_step_prepare (thread_info *thread)
{
- int prepared = -1;
+ displaced_step_prepare_status status
+ = DISPLACED_STEP_PREPARE_STATUS_ERROR;
try
{
- prepared = displaced_step_prepare_throw (thread);
+ status = displaced_step_prepare_throw (thread);
}
catch (const gdb_exception_error &ex)
{
&& ex.error != NOT_SUPPORTED_ERROR)
throw;
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: disabling displaced stepping: %s\n",
- ex.what ());
- }
+ infrun_log_debug ("caught exception, disabling displaced stepping: %s",
+ ex.what ());
/* Be verbose if "set displaced-stepping" is "on", silent if
"auto". */
displaced_state->failed_before = 1;
}
- return prepared;
-}
-
-static void
-write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr,
- const gdb_byte *myaddr, int len)
-{
- scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
-
- inferior_ptid = ptid;
- write_memory (memaddr, myaddr, len);
-}
-
-/* Restore the contents of the copy area for thread PTID. */
-
-static void
-displaced_step_restore (struct displaced_step_inferior_state *displaced,
- ptid_t ptid)
-{
- ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch);
-
- write_memory_ptid (ptid, displaced->step_copy,
- displaced->step_saved_copy.data (), len);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n",
- target_pid_to_str (ptid).c_str (),
- paddress (displaced->step_gdbarch,
- displaced->step_copy));
+ return status;
}
/* If we displaced stepped an instruction successfully, adjust
-1. If the thread wasn't displaced stepping, return 0. */
static int
-displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal)
+displaced_step_finish (thread_info *event_thread, enum gdb_signal signal)
{
- struct displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (event_thread->inf);
- int ret;
+ displaced_step_thread_state *displaced
+ = get_displaced_stepping_state (event_thread);
- /* Was this event for the thread we displaced? */
- if (displaced->step_thread != event_thread)
+ /* Was this thread performing a displaced step? */
+ if (!displaced->in_progress ())
return 0;
- displaced_step_clear_cleanup cleanup (displaced);
-
- displaced_step_restore (displaced, displaced->step_thread->ptid);
+ displaced_step_reset_cleanup cleanup (displaced);
/* Fixup may need to read memory/registers. Switch to the thread
that we're fixing up. Also, target_stopped_by_watchpoint checks
- the current thread. */
+ the current thread, and displaced_step_restore performs ptid-dependent
+ memory accesses using current_inferior() and current_top_target(). */
switch_to_thread (event_thread);
- /* Did the instruction complete successfully? */
- if (signal == GDB_SIGNAL_TRAP
- && !(target_stopped_by_watchpoint ()
- && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch)
- || target_have_steppable_watchpoint)))
- {
- /* Fix up the resulting state. */
- gdbarch_displaced_step_fixup (displaced->step_gdbarch,
- displaced->step_closure,
- displaced->step_original,
- displaced->step_copy,
- get_thread_regcache (displaced->step_thread));
- ret = 1;
- }
- else
- {
- /* Since the instruction didn't complete, all we can do is
- relocate the PC. */
- struct regcache *regcache = get_thread_regcache (event_thread);
- CORE_ADDR pc = regcache_read_pc (regcache);
-
- pc = displaced->step_original + (pc - displaced->step_copy);
- regcache_write_pc (regcache, pc);
- ret = -1;
- }
+ /* Do the fixup, and release the resources acquired to do the displaced
+ step. */
+ displaced_step_finish_status finish_status =
+ event_thread->inf->top_target ()->displaced_step_finish (event_thread,
+ signal);
- return ret;
+ if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK)
+ return 1;
+ else
+ return -1;
}
/* Data to be passed around while handling an event. This data is
discarded between events. */
struct execution_control_state
{
+ process_stratum_target *target;
ptid_t ptid;
/* The thread that got the event, if this was a thread event; NULL
otherwise. */
start_step_over (void)
{
struct thread_info *tp, *next;
+ int started = 0;
/* Don't start a new step-over if we already have an in-line
step-over operation ongoing. */
if (step_over_info_valid_p ())
- return 0;
+ return started;
- for (tp = step_over_queue_head; tp != NULL; tp = next)
+ /* Steal the global thread step over chain. */
+ thread_info *threads_to_step = global_thread_step_over_chain_head;
+ global_thread_step_over_chain_head = NULL;
+
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: stealing list of %d threads to step from global queue\n",
+ thread_step_over_chain_length (threads_to_step));
+
+ for (inferior *inf : all_inferiors ())
+ inf->displaced_step_state.unavailable = false;
+
+ for (tp = threads_to_step; tp != NULL; tp = next)
{
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
gdb_assert (!tp->stop_requested);
- next = thread_step_over_chain_next (tp);
-
- /* If this inferior already has a displaced step in process,
- don't start a new one. */
- if (displaced_step_in_progress (tp->inf))
- continue;
+ next = thread_step_over_chain_next (threads_to_step, tp);
step_what = thread_still_needs_step_over (tp);
must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT)
/* We currently stop all threads of all processes to step-over
in-line. If we need to start a new in-line step-over, let
any pending displaced steps finish first. */
- if (must_be_in_line && displaced_step_in_progress_any_inferior ())
- return 0;
-
- thread_step_over_chain_remove (tp);
+ if (must_be_in_line && displaced_step_in_progress_any_thread ())
+ continue;
- if (step_over_queue_head == NULL)
- {
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: step-over queue now empty\n");
- }
+ thread_step_over_chain_remove (&threads_to_step, tp);
if (tp->control.trap_expected
|| tp->resumed
tp->executing);
}
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resuming [%s] for step-over\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("resuming [%s] for step-over",
+ target_pid_to_str (tp->ptid).c_str ());
/* keep_going_pass_signal skips the step-over if the breakpoint
is no longer inserted. In all-stop, we want to keep looking
if (!target_is_non_stop_p () && !step_what)
continue;
+ if (tp->inf->displaced_step_state.unavailable)
+ {
+ global_thread_step_over_chain_enqueue (tp);
+ continue;
+ }
+
switch_to_thread (tp);
reset_ecs (ecs, tp);
keep_going_pass_signal (ecs);
if (!ecs->wait_some_more)
error (_("Command aborted."));
- gdb_assert (tp->resumed);
+ /* If the thread's step over could not be initiated, it was re-added
+ to the global step over chain. */
+ if (tp->resumed)
+ {
+ infrun_log_debug ("start_step_over: [%s] was resumed.\n",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (!thread_is_in_step_over_chain (tp));
+ }
+ else
+ {
+ infrun_log_debug ("infrun: start_step_over: [%s] was NOT resumed.\n",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (thread_is_in_step_over_chain (tp));
+
+ }
/* If we started a new in-line step-over, we're done. */
if (step_over_info_valid_p ())
{
gdb_assert (tp->control.trap_expected);
- return 1;
+ started = 1;
+ break;
}
if (!target_is_non_stop_p ())
/* With remote targets (at least), in all-stop, we can't
issue any further remote commands until the program stops
again. */
- return 1;
+ started = 1;
+ break;
}
/* Either the thread no longer needed a step-over, or a new
displaced step on a thread of other process. */
}
- return 0;
+ /* If there are threads left in the THREADS_TO_STEP list, but we have
+ detected that we can't start anything more, put back these threads
+ in the global list. */
+ if (threads_to_step == NULL)
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: step-over queue now empty\n");
+ }
+ else
+ {
+ if (debug_infrun)
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: putting back %d threads to step in global queue\n",
+ thread_step_over_chain_length (threads_to_step));
+ while (threads_to_step != nullptr)
+ {
+ thread_info *thread = threads_to_step;
+
+ /* Remove from that list. */
+ thread_step_over_chain_remove (&threads_to_step, thread);
+
+ /* Add to global list. */
+ global_thread_step_over_chain_enqueue (thread);
+
+ }
+ }
+
+ return started;
}
/* Update global variables holding ptids to hold NEW_PTID if they were
return resume_ptid;
}
+/* See infrun.h. */
+
+process_stratum_target *
+user_visible_resume_target (ptid_t resume_ptid)
+{
+ return (resume_ptid == minus_one_ptid && sched_multi
+ ? NULL
+ : current_inferior ()->process_target ());
+}
+
/* Return a ptid representing the set of threads that we will resume,
in the perspective of the target, assuming run control handling
does not require leaving some threads stopped (e.g., stepping past
target_resume (resume_ptid, step, sig);
target_commit_resume ();
+
+ if (target_can_async_p ())
+ target_async (1);
}
/* Resume the inferior. SIG is the signal to give the inferior
struct regcache *regcache = get_current_regcache ();
struct gdbarch *gdbarch = regcache->arch ();
struct thread_info *tp = inferior_thread ();
- CORE_ADDR pc = regcache_read_pc (regcache);
const address_space *aspace = regcache->aspace ();
ptid_t resume_ptid;
/* This represents the user's step vs continue request. When
if (tp->suspend.waitstatus_pending_p)
{
- if (debug_infrun)
- {
- std::string statstr
- = target_waitstatus_to_string (&tp->suspend.waitstatus);
-
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume: thread %s has pending wait "
- "status %s (currently_stepping=%d).\n",
- target_pid_to_str (tp->ptid).c_str (),
- statstr.c_str (),
- currently_stepping (tp));
- }
+ infrun_log_debug
+ ("thread %s has pending wait "
+ "status %s (currently_stepping=%d).",
+ target_pid_to_str (tp->ptid).c_str (),
+ target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (),
+ currently_stepping (tp));
- tp->resumed = 1;
+ tp->inf->process_target ()->threads_executing = true;
+ tp->resumed = true;
/* FIXME: What should we do if we are supposed to resume this
thread with a signal? Maybe we should maintain a queue of
Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
the parent, and tell it to `keep_going', which automatically
re-sets it stepping. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume : clear step\n");
+ infrun_log_debug ("resume : clear step");
step = 0;
}
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume (step=%d, signal=%s), "
- "trap_expected=%d, current thread [%s] at %s\n",
- step, gdb_signal_to_symbol_string (sig),
- tp->control.trap_expected,
- target_pid_to_str (inferior_ptid).c_str (),
- paddress (gdbarch, pc));
+ CORE_ADDR pc = regcache_read_pc (regcache);
+
+ infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, "
+ "current thread [%s] at %s",
+ step, gdb_signal_to_symbol_string (sig),
+ tp->control.trap_expected,
+ target_pid_to_str (inferior_ptid).c_str (),
+ paddress (gdbarch, pc));
/* Normally, by the time we reach `resume', the breakpoints are either
removed or inserted, as appropriate. The exception is if we're sitting
signal handler (or hit some other event). We'll delete
the step-resume breakpoint then. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume: skipping permanent breakpoint, "
- "deliver signal first\n");
+ infrun_log_debug ("resume: skipping permanent breakpoint, "
+ "deliver signal first");
clear_step_over_info ();
tp->control.trap_expected = 0;
{
/* There's no signal to pass, we can go ahead and skip the
permanent breakpoint manually. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume: skipping permanent breakpoint\n");
+ infrun_log_debug ("skipping permanent breakpoint");
gdbarch_skip_permanent_breakpoint (gdbarch, regcache);
/* Update pc to reflect the new address from which we will
execute instructions. */
resume_ptid = internal_resume_ptid (user_step);
do_target_resume (resume_ptid, 0, GDB_SIGNAL_0);
- tp->resumed = 1;
+ tp->resumed = true;
return;
}
}
if (tp->control.trap_expected || bpstat_should_step ())
tp->control.may_range_step = 0;
- /* If enabled, step over breakpoints by executing a copy of the
- instruction at a different address.
+ /* If displaced stepping is enabled, step over breakpoints by executing a
+ copy of the instruction at a different address.
We can't use displaced stepping when we have a signal to deliver;
the comments for displaced_step_prepare explain why. The
&& sig == GDB_SIGNAL_0
&& !current_inferior ()->waiting_for_vfork_done)
{
- int prepared = displaced_step_prepare (tp);
+ displaced_step_prepare_status prepare_status
+ = displaced_step_prepare (tp);
- if (prepared == 0)
+ if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "Got placed in step-over queue\n");
+ infrun_log_debug ("Got placed in step-over queue");
tp->control.trap_expected = 0;
return;
}
- else if (prepared < 0)
+ else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR)
{
/* Fallback to stepping over the breakpoint in-line. */
insert_breakpoints ();
}
- else if (prepared > 0)
+ else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK)
{
- struct displaced_step_inferior_state *displaced;
-
- /* Update pc to reflect the new address from which we will
- execute instructions due to displaced stepping. */
- pc = regcache_read_pc (get_thread_regcache (tp));
-
- displaced = get_displaced_stepping_state (tp->inf);
- step = gdbarch_displaced_step_hw_singlestep (gdbarch,
- displaced->step_closure);
+ step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL);
}
+ else
+ gdb_assert_not_reached ("invalid displaced_step_prepare_status value");
}
/* Do we need to do it the hard way, w/temp breakpoints? */
&& step_over_info_valid_p ())
{
/* If we have nested signals or a pending signal is delivered
- immediately after a handler returns, might might already have
+ immediately after a handler returns, might already have
a step-resume breakpoint set on the earlier handler. We cannot
set another step-resume breakpoint; just continue on until the
original breakpoint is hit. */
gdb.threads/non-stop-fair-events.exp, on targets that don't
do displaced stepping. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resume: [%s] stepped breakpoint\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("resume: [%s] stepped breakpoint",
+ target_pid_to_str (tp->ptid).c_str ());
tp->stepped_breakpoint = 1;
}
do_target_resume (resume_ptid, step, sig);
- tp->resumed = 1;
+ tp->resumed = true;
}
/* Resume the inferior. SIG is the signal to give the inferior
static void
clear_proceed_status_thread (struct thread_info *tp)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: clear_proceed_status_thread (%s)\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ());
/* If we're starting a new sequence, then the previous finished
single-step is no longer relevant. */
{
if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: clear_proceed_status: pending "
- "event of %s was a finished step. "
- "Discarding.\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("pending event of %s was a finished step. "
+ "Discarding.",
+ target_pid_to_str (tp->ptid).c_str ());
tp->suspend.waitstatus_pending_p = 0;
tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON;
}
- else if (debug_infrun)
+ else
{
- std::string statstr
- = target_waitstatus_to_string (&tp->suspend.waitstatus);
-
- fprintf_unfiltered (gdb_stdlog,
- "infrun: clear_proceed_status_thread: thread %s "
- "has pending wait status %s "
- "(currently_stepping=%d).\n",
- target_pid_to_str (tp->ptid).c_str (),
- statstr.c_str (),
- currently_stepping (tp));
+ infrun_log_debug
+ ("thread %s has pending wait status %s (currently_stepping=%d).",
+ target_pid_to_str (tp->ptid).c_str (),
+ target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (),
+ currently_stepping (tp));
}
}
if (!non_stop && inferior_ptid != null_ptid)
{
ptid_t resume_ptid = user_visible_resume_ptid (step);
+ process_stratum_target *resume_target
+ = user_visible_resume_target (resume_ptid);
/* In all-stop mode, delete the per-thread status of all threads
we're about to resume, implicitly and explicitly. */
- for (thread_info *tp : all_non_exited_threads (resume_ptid))
+ for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid))
clear_proceed_status_thread (tp);
}
execution_direction)));
}
+/* Calls target_commit_resume on all targets. */
+
+static void
+commit_resume_all_targets ()
+{
+ scoped_restore_current_thread restore_thread;
+
+ /* Map between process_target and a representative inferior. This
+ is to avoid committing a resume in the same target more than
+ once. Resumptions must be idempotent, so this is an
+ optimization. */
+ std::unordered_map<process_stratum_target *, inferior *> conn_inf;
+
+ for (inferior *inf : all_non_exited_inferiors ())
+ if (inf->has_execution ())
+ conn_inf[inf->process_target ()] = inf;
+
+ for (const auto &ci : conn_inf)
+ {
+ inferior *inf = ci.second;
+ switch_to_inferior_no_thread (inf);
+ target_commit_resume ();
+ }
+}
+
+/* Check that all the targets we're about to resume are in non-stop
+ mode. Ideally, we'd only care whether all targets support
+ target-async, but we're not there yet. E.g., stop_all_threads
+ doesn't know how to handle all-stop targets. Also, the remote
+ protocol in all-stop mode is synchronous, irrespective of
+ target-async, which means that things like a breakpoint re-set
+ triggered by one target would try to read memory from all targets
+ and fail. */
+
+static void
+check_multi_target_resumption (process_stratum_target *resume_target)
+{
+ if (!non_stop && resume_target == nullptr)
+ {
+ scoped_restore_current_thread restore_thread;
+
+ /* This is used to track whether we're resuming more than one
+ target. */
+ process_stratum_target *first_connection = nullptr;
+
+ /* The first inferior we see with a target that does not work in
+ always-non-stop mode. */
+ inferior *first_not_non_stop = nullptr;
+
+ for (inferior *inf : all_non_exited_inferiors (resume_target))
+ {
+ switch_to_inferior_no_thread (inf);
+
+ if (!target_has_execution)
+ continue;
+
+ process_stratum_target *proc_target
+ = current_inferior ()->process_target();
+
+ if (!target_is_non_stop_p ())
+ first_not_non_stop = inf;
+
+ if (first_connection == nullptr)
+ first_connection = proc_target;
+ else if (first_connection != proc_target
+ && first_not_non_stop != nullptr)
+ {
+ switch_to_inferior_no_thread (first_not_non_stop);
+
+ proc_target = current_inferior ()->process_target();
+
+ error (_("Connection %d (%s) does not support "
+ "multi-target resumption."),
+ proc_target->connection_number,
+ make_target_connection_string (proc_target).c_str ());
+ }
+ }
+ }
+}
+
/* Basic routine for continuing the program in various fashions.
ADDR is the address to resume at, or -1 for resume where stopped.
struct regcache *regcache;
struct gdbarch *gdbarch;
CORE_ADDR pc;
- ptid_t resume_ptid;
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
int started;
gdbarch = regcache->arch ();
const address_space *aspace = regcache->aspace ();
- pc = regcache_read_pc (regcache);
+ pc = regcache_read_pc_protected (regcache);
+
thread_info *cur_thr = inferior_thread ();
/* Fill in with reasonable starting values. */
gdb_assert (!thread_is_in_step_over_chain (cur_thr));
+ ptid_t resume_ptid
+ = user_visible_resume_ptid (cur_thr->control.stepping_command);
+ process_stratum_target *resume_target
+ = user_visible_resume_target (resume_ptid);
+
+ check_multi_target_resumption (resume_target);
+
if (addr == (CORE_ADDR) -1)
{
if (pc == cur_thr->suspend.stop_pc
if (siggnal != GDB_SIGNAL_DEFAULT)
cur_thr->suspend.stop_signal = siggnal;
- resume_ptid = user_visible_resume_ptid (cur_thr->control.stepping_command);
-
/* If an exception is thrown from this point on, make sure to
propagate GDB's knowledge of the executing state to the
frontend/user running state. */
- scoped_finish_thread_state finish_state (resume_ptid);
+ scoped_finish_thread_state finish_state (resume_target, resume_ptid);
/* Even if RESUME_PTID is a wildcard, and we end up resuming fewer
threads (e.g., we might need to set threads stepping over
inferior function, as in that case we pretend the inferior
doesn't run at all. */
if (!cur_thr->control.in_infcall)
- set_running (resume_ptid, 1);
+ set_running (resume_target, resume_ptid, true);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: proceed (addr=%s, signal=%s)\n",
- paddress (gdbarch, addr),
- gdb_signal_to_symbol_string (siggnal));
+ infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr),
+ gdb_signal_to_symbol_string (siggnal));
annotate_starting ();
threads. */
if (!non_stop && !schedlock_applies (cur_thr))
{
- for (thread_info *tp : all_non_exited_threads (resume_ptid))
+ for (thread_info *tp : all_non_exited_threads (resume_target,
+ resume_ptid))
{
switch_to_thread_no_regs (tp);
gdb_assert (!thread_is_in_step_over_chain (tp));
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: need to step-over [%s] first\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("need to step-over [%s] first",
+ target_pid_to_str (tp->ptid).c_str ());
- thread_step_over_chain_enqueue (tp);
+ global_thread_step_over_chain_enqueue (tp);
}
switch_to_thread (cur_thr);
/* Enqueue the current thread last, so that we move all other
threads over their breakpoints first. */
if (cur_thr->stepping_over_breakpoint)
- thread_step_over_chain_enqueue (cur_thr);
+ global_thread_step_over_chain_enqueue (cur_thr);
/* If the thread isn't started, we'll still need to set its prev_pc,
so that switch_back_to_stepped_thread knows the thread hasn't
advanced. Must do this before resuming any thread, as in
all-stop/remote, once we resume we can't send any other packet
until the target stops again. */
- cur_thr->prev_pc = regcache_read_pc (regcache);
+ cur_thr->prev_pc = regcache_read_pc_protected (regcache);
{
scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume ();
{
/* In all-stop, but the target is always in non-stop mode.
Start all other threads that are implicitly resumed too. */
- for (thread_info *tp : all_non_exited_threads (resume_ptid))
- {
- switch_to_thread_no_regs (tp);
+ for (thread_info *tp : all_non_exited_threads (resume_target,
+ resume_ptid))
+ {
+ switch_to_thread_no_regs (tp);
- if (tp->resumed)
- {
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: proceed: [%s] resumed\n",
- target_pid_to_str (tp->ptid).c_str ());
- gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p);
- continue;
- }
+ if (!tp->inf->has_execution ())
+ {
+ infrun_log_debug ("[%s] target has no execution",
+ target_pid_to_str (tp->ptid).c_str ());
+ continue;
+ }
- if (thread_is_in_step_over_chain (tp))
- {
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: proceed: [%s] needs step-over\n",
- target_pid_to_str (tp->ptid).c_str ());
- continue;
- }
+ if (tp->resumed)
+ {
+ infrun_log_debug ("[%s] resumed",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p);
+ continue;
+ }
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: proceed: resuming %s\n",
- target_pid_to_str (tp->ptid).c_str ());
+ if (thread_is_in_step_over_chain (tp))
+ {
+ infrun_log_debug ("[%s] needs step-over",
+ target_pid_to_str (tp->ptid).c_str ());
+ continue;
+ }
- reset_ecs (ecs, tp);
- switch_to_thread (tp);
- keep_going_pass_signal (ecs);
- if (!ecs->wait_some_more)
- error (_("Command aborted."));
- }
+ infrun_log_debug ("resuming %s",
+ target_pid_to_str (tp->ptid).c_str ());
+
+ reset_ecs (ecs, tp);
+ switch_to_thread (tp);
+ keep_going_pass_signal (ecs);
+ if (!ecs->wait_some_more)
+ error (_("Command aborted."));
+ }
}
else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr))
{
}
}
- target_commit_resume ();
+ commit_resume_all_targets ();
finish_state.release ();
void
start_remote (int from_tty)
{
- struct inferior *inferior;
-
- inferior = current_inferior ();
- inferior->control.stop_soon = STOP_QUIETLY_REMOTE;
+ inferior *inf = current_inferior ();
+ inf->control.stop_soon = STOP_QUIETLY_REMOTE;
/* Always go on waiting for the target, regardless of the mode. */
/* FIXME: cagney/1999-09-23: At present it isn't possible to
target_open() return to the caller an indication that the target
is currently running and GDB state should be set to the same as
for an async run. */
- wait_for_inferior ();
+ wait_for_inferior (inf);
/* Now that the inferior has stopped, do any bookkeeping like
loading shared libraries. We want to do this before normal_stop,
clear_proceed_status (0);
- target_last_wait_ptid = minus_one_ptid;
+ nullify_last_target_wait_ptid ();
previous_inferior_ptid = inferior_ptid;
}
static void
infrun_thread_stop_requested (ptid_t ptid)
{
+ process_stratum_target *curr_target = current_inferior ()->process_target ();
+
/* PTID was requested to stop. If the thread was already stopped,
but the user/frontend doesn't know about that yet (e.g., the
thread had been temporarily paused for some step-over), set up
for reporting the stop now. */
- for (thread_info *tp : all_threads (ptid))
+ for (thread_info *tp : all_threads (curr_target, ptid))
{
if (tp->state != THREAD_RUNNING)
continue;
start_step_over doesn't try to resume them
automatically. */
if (thread_is_in_step_over_chain (tp))
- thread_step_over_chain_remove (tp);
+ global_thread_step_over_chain_remove (tp);
/* If the thread is stopped, but the user/frontend doesn't
know about that yet, queue a pending event, as if the
/* Clear the inline-frame state, since we're re-processing the
stop. */
- clear_inline_frame_state (tp->ptid);
+ clear_inline_frame_state (tp);
/* If this thread was paused because some other thread was
doing an inline-step over, let that finish first. Once
/* Otherwise we can process the (new) pending event now. Set
it so this pending event is considered by
do_target_wait. */
- tp->resumed = 1;
+ tp->resumed = true;
}
}
static void
infrun_thread_thread_exit (struct thread_info *tp, int silent)
{
- if (target_last_wait_ptid == tp->ptid)
+ if (target_last_proc_target == tp->inf->process_target ()
+ && target_last_wait_ptid == tp->ptid)
nullify_last_target_wait_ptid ();
}
had events. */
static struct thread_info *
-random_pending_event_thread (ptid_t waiton_ptid)
+random_pending_event_thread (inferior *inf, ptid_t waiton_ptid)
{
int num_events = 0;
- auto has_event = [] (thread_info *tp)
+ auto has_event = [&] (thread_info *tp)
{
- return (tp->resumed
+ return (tp->ptid.matches (waiton_ptid)
+ && tp->resumed
&& tp->suspend.waitstatus_pending_p);
};
/* First see how many events we have. Count only resumed threads
that have an event pending. */
- for (thread_info *tp : all_non_exited_threads (waiton_ptid))
+ for (thread_info *tp : inf->non_exited_threads ())
if (has_event (tp))
num_events++;
int random_selector = (int) ((num_events * (double) rand ())
/ (RAND_MAX + 1.0));
- if (debug_infrun && num_events > 1)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: Found %d events, selecting #%d\n",
- num_events, random_selector);
+ if (num_events > 1)
+ infrun_log_debug ("Found %d events, selecting #%d",
+ num_events, random_selector);
/* Select the Nth thread that has had an event. */
- for (thread_info *tp : all_non_exited_threads (waiton_ptid))
+ for (thread_info *tp : inf->non_exited_threads ())
if (has_event (tp))
if (random_selector-- == 0)
return tp;
/* Wrapper for target_wait that first checks whether threads have
pending statuses to report before actually asking the target for
- more events. */
+ more events. INF is the inferior we're using to call target_wait
+ on. */
static ptid_t
-do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options)
+do_target_wait_1 (inferior *inf, ptid_t ptid,
+ target_waitstatus *status, int options)
{
ptid_t event_ptid;
struct thread_info *tp;
+ /* We know that we are looking for an event in the target of inferior
+ INF, but we don't know which thread the event might come from. As
+ such we want to make sure that INFERIOR_PTID is reset so that none of
+ the wait code relies on it - doing so is always a mistake. */
+ switch_to_inferior_no_thread (inf);
+
/* First check if there is a resumed thread with a wait status
pending. */
if (ptid == minus_one_ptid || ptid.is_pid ())
{
- tp = random_pending_event_thread (ptid);
+ tp = random_pending_event_thread (inf, ptid);
}
else
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: Waiting for specific thread %s.\n",
- target_pid_to_str (ptid).c_str ());
+ infrun_log_debug ("Waiting for specific thread %s.",
+ target_pid_to_str (ptid).c_str ());
/* We have a specific thread to check. */
- tp = find_thread_ptid (ptid);
+ tp = find_thread_ptid (inf, ptid);
gdb_assert (tp != NULL);
if (!tp->suspend.waitstatus_pending_p)
tp = NULL;
if (pc != tp->suspend.stop_pc)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: PC of %s changed. was=%s, now=%s\n",
- target_pid_to_str (tp->ptid).c_str (),
- paddress (gdbarch, tp->suspend.stop_pc),
- paddress (gdbarch, pc));
+ infrun_log_debug ("PC of %s changed. was=%s, now=%s",
+ target_pid_to_str (tp->ptid).c_str (),
+ paddress (gdbarch, tp->suspend.stop_pc),
+ paddress (gdbarch, pc));
discard = 1;
}
else if (!breakpoint_inserted_here_p (regcache->aspace (), pc))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: previous breakpoint of %s, at %s gone\n",
- target_pid_to_str (tp->ptid).c_str (),
- paddress (gdbarch, pc));
+ infrun_log_debug ("previous breakpoint of %s, at %s gone",
+ target_pid_to_str (tp->ptid).c_str (),
+ paddress (gdbarch, pc));
discard = 1;
}
if (discard)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: pending event of %s cancelled.\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("pending event of %s cancelled.",
+ target_pid_to_str (tp->ptid).c_str ());
tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS;
tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON;
if (tp != NULL)
{
- if (debug_infrun)
- {
- std::string statstr
- = target_waitstatus_to_string (&tp->suspend.waitstatus);
-
- fprintf_unfiltered (gdb_stdlog,
- "infrun: Using pending wait status %s for %s.\n",
- statstr.c_str (),
- target_pid_to_str (tp->ptid).c_str ());
- }
+ infrun_log_debug ("Using pending wait status %s for %s.",
+ target_waitstatus_to_string
+ (&tp->suspend.waitstatus).c_str (),
+ target_pid_to_str (tp->ptid).c_str ());
/* Now that we've selected our final event LWP, un-adjust its PC
if it was a software breakpoint (and the target doesn't
return event_ptid;
}
+/* Returns true if INF has any resumed thread with a status
+ pending. */
+
+static bool
+threads_are_resumed_pending_p (inferior *inf)
+{
+ for (thread_info *tp : inf->non_exited_threads ())
+ if (tp->resumed
+ && tp->suspend.waitstatus_pending_p)
+ return true;
+
+ return false;
+}
+
+/* Wrapper for target_wait that first checks whether threads have
+ pending statuses to report before actually asking the target for
+ more events. Polls for events from all inferiors/targets. */
+
+static bool
+do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options)
+{
+ int num_inferiors = 0;
+ int random_selector;
+
+ /* For fairness, we pick the first inferior/target to poll at
+ random, and then continue polling the rest of the inferior list
+ starting from that one in a circular fashion until the whole list
+ is polled once. */
+
+ auto inferior_matches = [&wait_ptid] (inferior *inf)
+ {
+ return (inf->process_target () != NULL
+ && (threads_are_executing (inf->process_target ())
+ || threads_are_resumed_pending_p (inf))
+ && ptid_t (inf->pid).matches (wait_ptid));
+ };
+
+ /* First see how many resumed inferiors we have. */
+ for (inferior *inf : all_inferiors ())
+ if (inferior_matches (inf))
+ num_inferiors++;
+
+ if (num_inferiors == 0)
+ {
+ ecs->ws.kind = TARGET_WAITKIND_IGNORE;
+ return false;
+ }
+
+ /* Now randomly pick an inferior out of those that were resumed. */
+ random_selector = (int)
+ ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0));
+
+ if (num_inferiors > 1)
+ infrun_log_debug ("Found %d inferiors, starting at #%d",
+ num_inferiors, random_selector);
+
+ /* Select the Nth inferior that was resumed. */
+
+ inferior *selected = nullptr;
+
+ for (inferior *inf : all_inferiors ())
+ if (inferior_matches (inf))
+ if (random_selector-- == 0)
+ {
+ selected = inf;
+ break;
+ }
+
+ /* Now poll for events out of each of the resumed inferior's
+ targets, starting from the selected one. */
+
+ auto do_wait = [&] (inferior *inf)
+ {
+ ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options);
+ ecs->target = inf->process_target ();
+ return (ecs->ws.kind != TARGET_WAITKIND_IGNORE);
+ };
+
+ /* Needed in all-stop+target-non-stop mode, because we end up here
+ spuriously after the target is all stopped and we've already
+ reported the stop to the user, polling for events. */
+ scoped_restore_current_thread restore_thread;
+
+ int inf_num = selected->num;
+ for (inferior *inf = selected; inf != NULL; inf = inf->next)
+ if (inferior_matches (inf))
+ if (do_wait (inf))
+ return true;
+
+ for (inferior *inf = inferior_list;
+ inf != NULL && inf->num < inf_num;
+ inf = inf->next)
+ if (inferior_matches (inf))
+ if (do_wait (inf))
+ return true;
+
+ ecs->ws.kind = TARGET_WAITKIND_IGNORE;
+ return false;
+}
+
/* Prepare and stabilize the inferior for detaching it. E.g.,
detaching while a thread is displaced stepping is a recipe for
crashing it, as nothing would readjust the PC out of the scratch
struct inferior *inf = current_inferior ();
ptid_t pid_ptid = ptid_t (inf->pid);
- displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf);
+ // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf);
/* Is any thread of this process displaced stepping? If not,
there's nothing else to do. */
- if (displaced->step_thread == nullptr)
+ if (displaced_step_in_progress (inf))
return;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "displaced-stepping in-process while detaching");
+ infrun_log_debug ("displaced-stepping in-process while detaching");
scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true);
- while (displaced->step_thread != nullptr)
+ // FIXME
+ while (false)
{
struct execution_control_state ecss;
struct execution_control_state *ecs;
don't get any event. */
target_dcache_invalidate ();
- ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0);
+ do_target_wait (pid_ptid, ecs, 0);
if (debug_infrun)
print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws);
/* If an error happens while handling the event, propagate GDB's
knowledge of the executing state to the frontend/user running
state. */
- scoped_finish_thread_state finish_state (minus_one_ptid);
+ scoped_finish_thread_state finish_state (inf->process_target (),
+ minus_one_ptid);
/* Now figure out what to do with the result of the result. */
handle_inferior_event (ecs);
When this function actually returns it means the inferior
should be left stopped and GDB should read more commands. */
-void
-wait_for_inferior (void)
+static void
+wait_for_inferior (inferior *inf)
{
- if (debug_infrun)
- fprintf_unfiltered
- (gdb_stdlog, "infrun: wait_for_inferior ()\n");
+ infrun_log_debug ("wait_for_inferior ()");
SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); };
/* If an error happens while handling the event, propagate GDB's
knowledge of the executing state to the frontend/user running
state. */
- scoped_finish_thread_state finish_state (minus_one_ptid);
+ scoped_finish_thread_state finish_state
+ (inf->process_target (), minus_one_ptid);
while (1)
{
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
- ptid_t waiton_ptid = minus_one_ptid;
memset (ecs, 0, sizeof (*ecs));
don't get any event. */
target_dcache_invalidate ();
- ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0);
+ ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0);
+ ecs->target = inf->process_target ();
if (debug_infrun)
- print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws);
+ print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws);
/* Now figure out what to do with the result of the result. */
handle_inferior_event (ecs);
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
int cmd_done = 0;
- ptid_t waiton_ptid = minus_one_ptid;
memset (ecs, 0, sizeof (*ecs));
= make_scoped_restore (&execution_direction,
target_execution_direction ());
- ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws,
- target_can_async_p () ? TARGET_WNOHANG : 0);
+ if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG))
+ return;
+
+ gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE);
+
+ /* Switch to the target that generated the event, so we can do
+ target calls. Any inferior bound to the target will do, so we
+ just switch to the first we find. */
+ for (inferior *inf : all_inferiors (ecs->target))
+ {
+ switch_to_inferior_no_thread (inf);
+ break;
+ }
if (debug_infrun)
- print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws);
+ print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws);
/* If an error happens while handling the event, propagate GDB's
knowledge of the executing state to the frontend/user running
state. */
ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid;
- scoped_finish_thread_state finish_state (finish_ptid);
+ scoped_finish_thread_state finish_state (ecs->target, finish_ptid);
/* Get executed before scoped_restore_current_thread above to apply
still for the thread which has thrown the exception. */
if (!ecs->wait_some_more)
{
- struct inferior *inf = find_inferior_ptid (ecs->ptid);
+ struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
int should_stop = 1;
struct thread_info *thr = ecs->event_thread;
printf_unfiltered (_("completed.\n"));
}
-/* Record the frame and location we're currently stepping through. */
+/* See infrun.h. */
+
void
-set_step_info (struct frame_info *frame, struct symtab_and_line sal)
+set_step_info (thread_info *tp, struct frame_info *frame,
+ struct symtab_and_line sal)
{
- struct thread_info *tp = inferior_thread ();
+ /* This can be removed once this function no longer implicitly relies on the
+ inferior_ptid value. */
+ gdb_assert (inferior_ptid == tp->ptid);
tp->control.step_frame_id = get_frame_id (frame);
tp->control.step_stack_frame_id = get_stack_frame_id (frame);
tss->step_after_step_resume_breakpoint = 0;
}
-/* Set the cached copy of the last ptid/waitstatus. */
+/* See infrun.h. */
void
-set_last_target_status (ptid_t ptid, struct target_waitstatus status)
+set_last_target_status (process_stratum_target *target, ptid_t ptid,
+ target_waitstatus status)
{
+ target_last_proc_target = target;
target_last_wait_ptid = ptid;
target_last_waitstatus = status;
}
-/* Return the cached copy of the last pid/waitstatus returned by
- target_wait()/deprecated_target_wait_hook(). The data is actually
- cached by handle_inferior_event(), which gets called immediately
- after target_wait()/deprecated_target_wait_hook(). */
+/* See infrun.h. */
void
-get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status)
+get_last_target_status (process_stratum_target **target, ptid_t *ptid,
+ target_waitstatus *status)
{
- *ptidp = target_last_wait_ptid;
- *status = target_last_waitstatus;
+ if (target != nullptr)
+ *target = target_last_proc_target;
+ if (ptid != nullptr)
+ *ptid = target_last_wait_ptid;
+ if (status != nullptr)
+ *status = target_last_waitstatus;
}
+/* See infrun.h. */
+
void
nullify_last_target_wait_ptid (void)
{
+ target_last_proc_target = nullptr;
target_last_wait_ptid = minus_one_ptid;
+ target_last_waitstatus = {};
}
/* Switch thread contexts. */
static void
context_switch (execution_control_state *ecs)
{
- if (debug_infrun
- && ecs->ptid != inferior_ptid
- && ecs->event_thread != inferior_thread ())
+ if (ecs->ptid != inferior_ptid
+ && (inferior_ptid == null_ptid
+ || ecs->event_thread != inferior_thread ()))
{
- fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ",
- target_pid_to_str (inferior_ptid).c_str ());
- fprintf_unfiltered (gdb_stdlog, "to %s\n",
- target_pid_to_str (ecs->ptid).c_str ());
+ infrun_log_debug ("Switching context from %s to %s",
+ target_pid_to_str (inferior_ptid).c_str (),
+ target_pid_to_str (ecs->ptid).c_str ());
}
switch_to_thread (ecs->event_thread);
if (catch_syscall_enabled () > 0
&& catching_syscall_number (syscall_number) > 0)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n",
- syscall_number);
+ infrun_log_debug ("syscall number=%d", syscall_number);
ecs->event_thread->control.stop_bpstat
= bpstat_stop_status (regcache->aspace (),
static enum stop_kind
get_inferior_stop_soon (execution_control_state *ecs)
{
- struct inferior *inf = find_inferior_ptid (ecs->ptid);
+ struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
gdb_assert (inf != NULL);
return inf->control.stop_soon;
}
-/* Wait for one event. Store the resulting waitstatus in WS, and
- return the event ptid. */
+/* Poll for one event out of the current target. Store the resulting
+ waitstatus in WS, and return the event ptid. Does not block. */
static ptid_t
-wait_one (struct target_waitstatus *ws)
+poll_one_curr_target (struct target_waitstatus *ws)
{
ptid_t event_ptid;
- ptid_t wait_ptid = minus_one_ptid;
overlay_cache_invalid = 1;
target_dcache_invalidate ();
if (deprecated_target_wait_hook)
- event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0);
+ event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG);
else
- event_ptid = target_wait (wait_ptid, ws, 0);
+ event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG);
if (debug_infrun)
- print_target_wait_results (wait_ptid, event_ptid, ws);
+ print_target_wait_results (minus_one_ptid, event_ptid, ws);
return event_ptid;
}
+/* An event reported by wait_one. */
+
+struct wait_one_event
+{
+ /* The target the event came out of. */
+ process_stratum_target *target;
+
+ /* The PTID the event was for. */
+ ptid_t ptid;
+
+ /* The waitstatus. */
+ target_waitstatus ws;
+};
+
+/* Wait for one event out of any target. */
+
+static wait_one_event
+wait_one ()
+{
+ while (1)
+ {
+ for (inferior *inf : all_inferiors ())
+ {
+ process_stratum_target *target = inf->process_target ();
+ if (target == NULL
+ || !target->is_async_p ()
+ || !target->threads_executing)
+ continue;
+
+ switch_to_inferior_no_thread (inf);
+
+ wait_one_event event;
+ event.target = target;
+ event.ptid = poll_one_curr_target (&event.ws);
+
+ if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED)
+ {
+ /* If nothing is resumed, remove the target from the
+ event loop. */
+ target_async (0);
+ }
+ else if (event.ws.kind != TARGET_WAITKIND_IGNORE)
+ return event;
+ }
+
+ /* Block waiting for some event. */
+
+ fd_set readfds;
+ int nfds = 0;
+
+ FD_ZERO (&readfds);
+
+ for (inferior *inf : all_inferiors ())
+ {
+ process_stratum_target *target = inf->process_target ();
+ if (target == NULL
+ || !target->is_async_p ()
+ || !target->threads_executing)
+ continue;
+
+ int fd = target->async_wait_fd ();
+ FD_SET (fd, &readfds);
+ if (nfds <= fd)
+ nfds = fd + 1;
+ }
+
+ if (nfds == 0)
+ {
+ /* No waitable targets left. All must be stopped. */
+ return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}};
+ }
+
+ QUIT;
+
+ int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0);
+ if (numfds < 0)
+ {
+ if (errno == EINTR)
+ continue;
+ else
+ perror_with_name ("interruptible_select");
+ }
+ }
+}
+
/* Generate a wrapper for target_stopped_by_REASON that works on PTID
instead of the current thread. */
#define THREAD_STOPPED_BY(REASON) \
/* Save the thread's event and stop reason to process it later. */
static void
-save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws)
+save_waitstatus (struct thread_info *tp, const target_waitstatus *ws)
{
- if (debug_infrun)
- {
- std::string statstr = target_waitstatus_to_string (ws);
-
- fprintf_unfiltered (gdb_stdlog,
- "infrun: saving status %s for %d.%ld.%ld\n",
- statstr.c_str (),
- tp->ptid.pid (),
- tp->ptid.lwp (),
- tp->ptid.tid ());
- }
+ infrun_log_debug ("saving status %s for %d.%ld.%ld",
+ target_waitstatus_to_string (ws).c_str (),
+ tp->ptid.pid (),
+ tp->ptid.lwp (),
+ tp->ptid.tid ());
/* Record for later. */
tp->suspend.waitstatus = *ws;
}
}
+/* Mark the non-executing threads accordingly. In all-stop, all
+ threads of all processes are stopped when we get any event
+ reported. In non-stop mode, only the event thread stops. */
+
+static void
+mark_non_executing_threads (process_stratum_target *target,
+ ptid_t event_ptid,
+ struct target_waitstatus ws)
+{
+ ptid_t mark_ptid;
+
+ if (!target_is_non_stop_p ())
+ mark_ptid = minus_one_ptid;
+ else if (ws.kind == TARGET_WAITKIND_SIGNALLED
+ || ws.kind == TARGET_WAITKIND_EXITED)
+ {
+ /* If we're handling a process exit in non-stop mode, even
+ though threads haven't been deleted yet, one would think
+ that there is nothing to do, as threads of the dead process
+ will be soon deleted, and threads of any other process were
+ left running. However, on some targets, threads survive a
+ process exit event. E.g., for the "checkpoint" command,
+ when the current checkpoint/fork exits, linux-fork.c
+ automatically switches to another fork from within
+ target_mourn_inferior, by associating the same
+ inferior/thread to another fork. We haven't mourned yet at
+ this point, but we must mark any threads left in the
+ process as not-executing so that finish_thread_state marks
+ them stopped (in the user's perspective) if/when we present
+ the stop to the user. */
+ mark_ptid = ptid_t (event_ptid.pid ());
+ }
+ else
+ mark_ptid = event_ptid;
+
+ set_executing (target, mark_ptid, false);
+
+ /* Likewise the resumed flag. */
+ set_resumed (target, mark_ptid, false);
+}
+
/* See infrun.h. */
void
int pass;
int iterations = 0;
- gdb_assert (target_is_non_stop_p ());
+ gdb_assert (exists_non_stop_target ());
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n");
+ infrun_log_debug ("stop_all_threads");
scoped_restore_current_thread restore_thread;
- target_thread_events (1);
- SCOPE_EXIT { target_thread_events (0); };
+ /* Enable thread events of all targets. */
+ for (auto *target : all_non_exited_process_targets ())
+ {
+ switch_to_target_no_thread (target);
+ target_thread_events (true);
+ }
+
+ SCOPE_EXIT
+ {
+ /* Disable thread events of all targets. */
+ for (auto *target : all_non_exited_process_targets ())
+ {
+ switch_to_target_no_thread (target);
+ target_thread_events (false);
+ }
+
+
+ infrun_log_debug ("stop_all_threads done");
+ };
/* Request threads to stop, and then wait for the stops. Because
threads we already know about can spawn more threads while we're
until two passes find no threads that need to be stopped. */
for (pass = 0; pass < 2; pass++, iterations++)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stop_all_threads, pass=%d, "
- "iterations=%d\n", pass, iterations);
+ infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d",
+ pass, iterations);
while (1)
{
- ptid_t event_ptid;
- struct target_waitstatus ws;
- int need_wait = 0;
+ int waits_needed = 0;
- update_thread_list ();
+ for (auto *target : all_non_exited_process_targets ())
+ {
+ switch_to_target_no_thread (target);
+ update_thread_list ();
+ }
/* Go through all threads looking for threads that we need
to tell the target to stop. */
for (thread_info *t : all_non_exited_threads ())
{
+ /* For a single-target setting with an all-stop target,
+ we would not even arrive here. For a multi-target
+ setting, until GDB is able to handle a mixture of
+ all-stop and non-stop targets, simply skip all-stop
+ targets' threads. This should be fine due to the
+ protection of 'check_multi_target_resumption'. */
+
+ switch_to_thread_no_regs (t);
+ if (!target_is_non_stop_p ())
+ continue;
+
if (t->executing)
{
/* If already stopping, don't request a stop again.
We just haven't seen the notification yet. */
if (!t->stop_requested)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: %s executing, "
- "need stop\n",
- target_pid_to_str (t->ptid).c_str ());
- switch_to_thread_no_regs (t);
+ infrun_log_debug (" %s executing, need stop",
+ target_pid_to_str (t->ptid).c_str ());
target_stop (t->ptid);
t->stop_requested = 1;
}
else
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: %s executing, "
- "already stopping\n",
- target_pid_to_str (t->ptid).c_str ());
+ infrun_log_debug (" %s executing, already stopping",
+ target_pid_to_str (t->ptid).c_str ());
}
if (t->stop_requested)
- need_wait = 1;
+ waits_needed++;
}
else
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: %s not executing\n",
- target_pid_to_str (t->ptid).c_str ());
+ infrun_log_debug (" %s not executing",
+ target_pid_to_str (t->ptid).c_str ());
/* The thread may be not executing, but still be
resumed with a pending status to process. */
- t->resumed = 0;
+ t->resumed = false;
}
}
- if (!need_wait)
+ if (waits_needed == 0)
break;
/* If we find new threads on the second iteration, restart
if (pass > 0)
pass = -1;
- event_ptid = wait_one (&ws);
- if (debug_infrun)
+ for (int i = 0; i < waits_needed; i++)
{
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stop_all_threads %s %s\n",
- target_waitstatus_to_string (&ws).c_str (),
- target_pid_to_str (event_ptid).c_str ());
- }
+ wait_one_event event = wait_one ();
- if (ws.kind == TARGET_WAITKIND_NO_RESUMED
- || ws.kind == TARGET_WAITKIND_THREAD_EXITED
- || ws.kind == TARGET_WAITKIND_EXITED
- || ws.kind == TARGET_WAITKIND_SIGNALLED)
- {
- /* All resumed threads exited
- or one thread/process exited/signalled. */
- }
- else
- {
- thread_info *t = find_thread_ptid (event_ptid);
- if (t == NULL)
- t = add_thread (event_ptid);
-
- t->stop_requested = 0;
- t->executing = 0;
- t->resumed = 0;
- t->control.may_range_step = 0;
-
- /* This may be the first time we see the inferior report
- a stop. */
- inferior *inf = find_inferior_ptid (event_ptid);
- if (inf->needs_setup)
+ infrun_log_debug ("%s %s\n",
+ target_waitstatus_to_string (&event.ws).c_str (),
+ target_pid_to_str (event.ptid).c_str ());
+
+ if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED)
{
- switch_to_thread_no_regs (t);
- setup_inferior (0);
+ /* All resumed threads exited. */
+ break;
}
-
- if (ws.kind == TARGET_WAITKIND_STOPPED
- && ws.value.sig == GDB_SIGNAL_0)
+ else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED
+ || event.ws.kind == TARGET_WAITKIND_EXITED
+ || event.ws.kind == TARGET_WAITKIND_SIGNALLED)
{
- /* We caught the event that we intended to catch, so
- there's no event pending. */
- t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE;
- t->suspend.waitstatus_pending_p = 0;
+ /* One thread/process exited/signalled. */
- if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0)
+ thread_info *t = nullptr;
+
+ /* The target may have reported just a pid. If so, try
+ the first non-exited thread. */
+ if (event.ptid.is_pid ())
{
- /* Add it back to the step-over queue. */
- if (debug_infrun)
+ int pid = event.ptid.pid ();
+ inferior *inf = find_inferior_pid (event.target, pid);
+ for (thread_info *tp : inf->non_exited_threads ())
{
- fprintf_unfiltered (gdb_stdlog,
- "infrun: displaced-step of %s "
- "canceled: adding back to the "
- "step-over queue\n",
- target_pid_to_str (t->ptid).c_str ());
+ t = tp;
+ break;
}
- t->control.trap_expected = 0;
- thread_step_over_chain_enqueue (t);
+
+ /* If there is no available thread, the event would
+ have to be appended to a per-inferior event list,
+ which does not exist (and if it did, we'd have
+ to adjust run control command to be able to
+ resume such an inferior). We assert here instead
+ of going into an infinite loop. */
+ gdb_assert (t != nullptr);
+
+ infrun_log_debug ("using %s\n",
+ target_pid_to_str (t->ptid).c_str ());
+ }
+ else
+ {
+ t = find_thread_ptid (event.target, event.ptid);
+ /* Check if this is the first time we see this thread.
+ Don't bother adding if it individually exited. */
+ if (t == nullptr
+ && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED)
+ t = add_thread (event.target, event.ptid);
+ }
+
+ if (t != nullptr)
+ {
+ /* Set the threads as non-executing to avoid
+ another stop attempt on them. */
+ switch_to_thread_no_regs (t);
+ mark_non_executing_threads (event.target, event.ptid,
+ event.ws);
+ save_waitstatus (t, &event.ws);
+ t->stop_requested = false;
}
}
else
{
- enum gdb_signal sig;
- struct regcache *regcache;
-
- if (debug_infrun)
+ thread_info *t = find_thread_ptid (event.target, event.ptid);
+ if (t == NULL)
+ t = add_thread (event.target, event.ptid);
+
+ t->stop_requested = 0;
+ t->executing = 0;
+ t->resumed = false;
+ t->control.may_range_step = 0;
+
+ /* This may be the first time we see the inferior report
+ a stop. */
+ inferior *inf = find_inferior_ptid (event.target, event.ptid);
+ if (inf->needs_setup)
{
- std::string statstr = target_waitstatus_to_string (&ws);
-
- fprintf_unfiltered (gdb_stdlog,
- "infrun: target_wait %s, saving "
- "status for %d.%ld.%ld\n",
- statstr.c_str (),
- t->ptid.pid (),
- t->ptid.lwp (),
- t->ptid.tid ());
+ switch_to_thread_no_regs (t);
+ setup_inferior (0);
}
- /* Record for later. */
- save_waitstatus (t, &ws);
+ if (event.ws.kind == TARGET_WAITKIND_STOPPED
+ && event.ws.value.sig == GDB_SIGNAL_0)
+ {
+ /* We caught the event that we intended to catch, so
+ there's no event pending. */
+ t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE;
+ t->suspend.waitstatus_pending_p = 0;
- sig = (ws.kind == TARGET_WAITKIND_STOPPED
- ? ws.value.sig : GDB_SIGNAL_0);
+ if (displaced_step_finish (t, GDB_SIGNAL_0) < 0)
+ {
+ /* Add it back to the step-over queue. */
+ infrun_log_debug ("displaced-step of %s "
+ "canceled: adding back to the "
+ "step-over queue\n",
+ target_pid_to_str (t->ptid).c_str ());
- if (displaced_step_fixup (t, sig) < 0)
- {
- /* Add it back to the step-over queue. */
- t->control.trap_expected = 0;
- thread_step_over_chain_enqueue (t);
+ t->control.trap_expected = 0;
+ global_thread_step_over_chain_enqueue (t);
+ }
}
+ else
+ {
+ enum gdb_signal sig;
+ struct regcache *regcache;
+
+ if (debug_infrun)
+ {
+ std::string statstr = target_waitstatus_to_string (&event.ws);
+
+ infrun_log_debug ("target_wait %s, saving "
+ "status for %d.%ld.%ld\n",
+ statstr.c_str (),
+ t->ptid.pid (),
+ t->ptid.lwp (),
+ t->ptid.tid ());
+ }
- regcache = get_thread_regcache (t);
- t->suspend.stop_pc = regcache_read_pc (regcache);
+ /* Record for later. */
+ save_waitstatus (t, &event.ws);
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: saved stop_pc=%s for %s "
- "(currently_stepping=%d)\n",
- paddress (target_gdbarch (),
- t->suspend.stop_pc),
- target_pid_to_str (t->ptid).c_str (),
- currently_stepping (t));
+ sig = (event.ws.kind == TARGET_WAITKIND_STOPPED
+ ? event.ws.value.sig : GDB_SIGNAL_0);
+
+ if (displaced_step_finish (t, sig) < 0)
+ {
+ /* Add it back to the step-over queue. */
+ t->control.trap_expected = 0;
+ global_thread_step_over_chain_enqueue (t);
+ }
+
+ regcache = get_thread_regcache (t);
+ t->suspend.stop_pc = regcache_read_pc (regcache);
+
+ infrun_log_debug ("saved stop_pc=%s for %s "
+ "(currently_stepping=%d)\n",
+ paddress (target_gdbarch (),
+ t->suspend.stop_pc),
+ target_pid_to_str (t->ptid).c_str (),
+ currently_stepping (t));
}
}
}
}
}
-
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n");
}
/* Handle a TARGET_WAITKIND_NO_RESUMED event. */
{
if (target_can_async_p ())
{
- struct ui *ui;
int any_sync = 0;
- ALL_UIS (ui)
+ for (ui *ui : all_uis ())
{
if (ui->prompt_state == PROMPT_BLOCKED)
{
we're not synchronously waiting for events either. Just
ignore. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_NO_RESUMED "
- "(ignoring: bg)\n");
+ infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)");
prepare_to_wait (ecs);
return 1;
}
the synchronous command show "no unwaited-for " to the user. */
update_thread_list ();
- for (thread_info *thread : all_non_exited_threads ())
+ for (thread_info *thread : all_non_exited_threads (ecs->target))
{
if (thread->executing
|| thread->suspend.waitstatus_pending_p)
{
/* There were no unwaited-for children left in the target at
some point, but there are now. Just ignore. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_NO_RESUMED "
- "(ignoring: found resumed)\n");
- prepare_to_wait (ecs);
- return 1;
- }
- }
-
- /* Note however that we may find no resumed thread because the whole
- process exited meanwhile (thus updating the thread list results
- in an empty thread list). In this case we know we'll be getting
- a process exit event shortly. */
- for (inferior *inf : all_inferiors ())
- {
- if (inf->pid == 0)
- continue;
-
- thread_info *thread = any_live_thread_of_inferior (inf);
- if (thread == NULL)
- {
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: TARGET_WAITKIND_NO_RESUMED "
- "(expect process exit)\n");
+ infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED "
+ "(ignoring: found resumed)");
prepare_to_wait (ecs);
return 1;
}
enum stop_kind stop_soon;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n",
- target_waitstatus_to_string (&ecs->ws).c_str ());
+ infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ());
if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
{
&& handle_no_resumed (ecs))
return;
- /* Cache the last pid/waitstatus. */
- set_last_target_status (ecs->ptid, ecs->ws);
+ /* Cache the last target/ptid/waitstatus. */
+ set_last_target_status (ecs->target, ecs->ptid, ecs->ws);
/* Always clear state belonging to the previous time we stopped. */
stop_stack_dummy = STOP_NONE;
if (ecs->ws.kind != TARGET_WAITKIND_EXITED
&& ecs->ws.kind != TARGET_WAITKIND_SIGNALLED)
{
- ecs->event_thread = find_thread_ptid (ecs->ptid);
+ ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid);
/* If it's a new thread, add it to the thread database. */
if (ecs->event_thread == NULL)
- ecs->event_thread = add_thread (ecs->ptid);
+ ecs->event_thread = add_thread (ecs->target, ecs->ptid);
/* Disable range stepping. If the next step request could use a
range, this will be end up re-enabled then. */
if (breakpoint_inserted_here_p (regcache->aspace (),
regcache_read_pc (regcache)))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: Treating signal as SIGTRAP\n");
+ infrun_log_debug ("Treating signal as SIGTRAP");
ecs->ws.value.sig = GDB_SIGNAL_TRAP;
}
}
- /* Mark the non-executing threads accordingly. In all-stop, all
- threads of all processes are stopped when we get any event
- reported. In non-stop mode, only the event thread stops. */
- {
- ptid_t mark_ptid;
-
- if (!target_is_non_stop_p ())
- mark_ptid = minus_one_ptid;
- else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED
- || ecs->ws.kind == TARGET_WAITKIND_EXITED)
- {
- /* If we're handling a process exit in non-stop mode, even
- though threads haven't been deleted yet, one would think
- that there is nothing to do, as threads of the dead process
- will be soon deleted, and threads of any other process were
- left running. However, on some targets, threads survive a
- process exit event. E.g., for the "checkpoint" command,
- when the current checkpoint/fork exits, linux-fork.c
- automatically switches to another fork from within
- target_mourn_inferior, by associating the same
- inferior/thread to another fork. We haven't mourned yet at
- this point, but we must mark any threads left in the
- process as not-executing so that finish_thread_state marks
- them stopped (in the user's perspective) if/when we present
- the stop to the user. */
- mark_ptid = ptid_t (ecs->ptid.pid ());
- }
- else
- mark_ptid = ecs->ptid;
-
- set_executing (mark_ptid, 0);
-
- /* Likewise the resumed flag. */
- set_resumed (mark_ptid, 0);
- }
+ mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws);
switch (ecs->ws.kind)
{
if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
|| stop_soon == STOP_QUIETLY_REMOTE)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
+ infrun_log_debug ("quietly stopped");
stop_waiting (ecs);
return;
}
case TARGET_WAITKIND_EXITED:
case TARGET_WAITKIND_SIGNALLED:
inferior_ptid = ecs->ptid;
- set_current_inferior (find_inferior_ptid (ecs->ptid));
+ set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid));
set_current_program_space (current_inferior ()->pspace);
handle_vfork_child_exec_or_exit (0);
target_terminal::ours (); /* Must do this before mourn anyway. */
information to the user. It's better to just warn
her about it (if infrun debugging is enabled), and
give up. */
- if (debug_infrun)
- fprintf_filtered (gdb_stdlog, _("\
-Cannot fill $_exitsignal with the correct signal number.\n"));
+ infrun_log_debug ("Cannot fill $_exitsignal with the correct "
+ "signal number.");
}
gdb::observers::signal_exited.notify (ecs->ws.value.sig);
stop_waiting (ecs);
return;
- /* The following are the only cases in which we keep going;
- the above cases end in a continue or goto. */
case TARGET_WAITKIND_FORKED:
case TARGET_WAITKIND_VFORKED:
/* Check whether the inferior is displaced stepping. */
/* If checking displaced stepping is supported, and thread
ecs->ptid is displaced stepping. */
- if (displaced_step_in_progress_thread (ecs->event_thread))
+ if (displaced_step_in_progress (ecs->event_thread))
{
struct inferior *parent_inf
- = find_inferior_ptid (ecs->ptid);
+ = find_inferior_ptid (ecs->target, ecs->ptid);
struct regcache *child_regcache;
CORE_ADDR parent_pc;
+ if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
+ {
+ // struct displaced_step_inferior_state *displaced
+ // = get_displaced_stepping_state (parent_inf);
+
+ /* Restore scratch pad for child process. */
+ //displaced_step_restore (displaced, ecs->ws.value.related_pid);
+ // FIXME: we should restore all the buffers that were currently in use
+ }
+
/* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
indicating that the displaced stepping of syscall instruction
has been done. Perform cleanup for parent process here. Note
that this operation also cleans up the child process for vfork,
because their pages are shared. */
- displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP);
+ displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP);
/* Start a new step-over in another thread if there's one
that needs it. */
start_step_over ();
- if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
- {
- struct displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (parent_inf);
-
- /* Restore scratch pad for child process. */
- displaced_step_restore (displaced, ecs->ws.value.related_pid);
- }
-
/* Since the vfork/fork syscall instruction was executed in the scratchpad,
the child's PC is also within the scratchpad. Set the child's PC
to the parent's PC value, which has already been fixed up.
list yet at this point. */
child_regcache
- = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid,
+ = get_thread_arch_aspace_regcache (parent_inf->process_target (),
+ ecs->ws.value.related_pid,
gdbarch,
parent_inf->aspace);
/* Read PC value of parent process. */
watchpoints, for example, always appear in the bpstat. */
if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
{
- int should_resume;
- int follow_child
+ bool follow_child
= (follow_fork_mode_string == follow_fork_mode_child);
ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
- should_resume = follow_fork ();
+ process_stratum_target *targ
+ = ecs->event_thread->inf->process_target ();
+
+ bool should_resume = follow_fork ();
+ /* Note that one of these may be an invalid pointer,
+ depending on detach_fork. */
thread_info *parent = ecs->event_thread;
- thread_info *child = find_thread_ptid (ecs->ws.value.related_pid);
+ thread_info *child
+ = find_thread_ptid (targ, ecs->ws.value.related_pid);
/* At this point, the parent is marked running, and the
child is marked stopped. */
/* Switch to the stopped thread. */
context_switch (ecs);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n");
+ infrun_log_debug ("stopped");
delete_just_stopped_threads_single_step_breakpoints ();
ecs->event_thread->suspend.stop_pc
if (tp == event_thread)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: "
- "[%s] is event thread\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] is event thread",
+ target_pid_to_str (tp->ptid).c_str ());
continue;
}
if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: "
- "[%s] not meant to be running\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] not meant to be running",
+ target_pid_to_str (tp->ptid).c_str ());
continue;
}
if (tp->resumed)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: [%s] resumed\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] resumed",
+ target_pid_to_str (tp->ptid).c_str ());
gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p);
continue;
}
if (thread_is_in_step_over_chain (tp))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: "
- "[%s] needs step-over\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] needs step-over",
+ target_pid_to_str (tp->ptid).c_str ());
gdb_assert (!tp->resumed);
continue;
}
if (tp->suspend.waitstatus_pending_p)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: "
- "[%s] has pending status\n",
- target_pid_to_str (tp->ptid).c_str ());
- tp->resumed = 1;
+ infrun_log_debug ("restart threads: [%s] has pending status",
+ target_pid_to_str (tp->ptid).c_str ());
+ tp->resumed = true;
continue;
}
if (currently_stepping (tp))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: [%s] was stepping\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] was stepping",
+ target_pid_to_str (tp->ptid).c_str ());
keep_going_stepped_thread (tp);
}
else
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: restart threads: [%s] continuing\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("restart threads: [%s] continuing",
+ target_pid_to_str (tp->ptid).c_str ());
reset_ecs (ecs, tp);
switch_to_thread (tp);
keep_going_pass_signal (ecs);
{
int had_step_over_info;
- displaced_step_fixup (ecs->event_thread,
- ecs->event_thread->suspend.stop_signal);
+ displaced_step_finish (ecs->event_thread,
+ ecs->event_thread->suspend.stop_signal);
had_step_over_info = step_over_info_valid_p ();
struct thread_info *tp = ecs->event_thread;
struct regcache *regcache;
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: found resumed threads with "
- "pending events, saving status\n");
- }
+ infrun_log_debug ("found resumed threads with "
+ "pending events, saving status");
gdb_assert (pending != tp);
/* This was cleared early, by handle_inferior_event. Set it
so this pending event is considered by
do_target_wait. */
- tp->resumed = 1;
+ tp->resumed = true;
gdb_assert (!tp->executing);
regcache = get_thread_regcache (tp);
tp->suspend.stop_pc = regcache_read_pc (regcache);
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: saved stop_pc=%s for %s "
- "(currently_stepping=%d)\n",
- paddress (target_gdbarch (),
- tp->suspend.stop_pc),
- target_pid_to_str (tp->ptid).c_str (),
- currently_stepping (tp));
- }
+ infrun_log_debug ("saved stop_pc=%s for %s "
+ "(currently_stepping=%d)\n",
+ paddress (target_gdbarch (),
+ tp->suspend.stop_pc),
+ target_pid_to_str (tp->ptid).c_str (),
+ currently_stepping (tp));
/* This in-line step-over finished; clear this so we won't
start a new one. This is what handle_signal_stop would
switch_to_thread (ecs->event_thread);
- fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n",
- paddress (reg_gdbarch,
- ecs->event_thread->suspend.stop_pc));
+ infrun_log_debug ("stop_pc=%s",
+ paddress (reg_gdbarch,
+ ecs->event_thread->suspend.stop_pc));
if (target_stopped_by_watchpoint ())
{
CORE_ADDR addr;
- fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n");
+ infrun_log_debug ("stopped by watchpoint");
if (target_stopped_data_address (current_top_target (), &addr))
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stopped data address = %s\n",
- paddress (reg_gdbarch, addr));
+ infrun_log_debug ("stopped data address=%s",
+ paddress (reg_gdbarch, addr));
else
- fprintf_unfiltered (gdb_stdlog,
- "infrun: (no data address available)\n");
+ infrun_log_debug ("(no data address available)");
}
}
if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
{
context_switch (ecs);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n");
+ infrun_log_debug ("quietly stopped");
stop_print_frame = 1;
stop_waiting (ecs);
return;
so, then switch to that thread. */
if (ecs->ptid != inferior_ptid)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n");
+ infrun_log_debug ("context switch");
context_switch (ecs);
{
if (single_step_breakpoint_inserted_here_p (aspace, pc))
{
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: [%s] hit another thread's "
- "single-step breakpoint\n",
- target_pid_to_str (ecs->ptid).c_str ());
- }
+ infrun_log_debug ("[%s] hit another thread's single-step "
+ "breakpoint",
+ target_pid_to_str (ecs->ptid).c_str ());
ecs->hit_singlestep_breakpoint = 1;
}
}
else
{
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: [%s] hit its "
- "single-step breakpoint\n",
- target_pid_to_str (ecs->ptid).c_str ());
- }
+ infrun_log_debug ("[%s] hit its single-step breakpoint",
+ target_pid_to_str (ecs->ptid).c_str ());
}
}
delete_just_stopped_threads_single_step_breakpoints ();
int step_through_delay
= gdbarch_single_step_through_delay (gdbarch, frame);
- if (debug_infrun && step_through_delay)
- fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n");
+ if (step_through_delay)
+ infrun_log_debug ("step through delay");
+
if (ecs->event_thread->control.step_range_end == 0
&& step_through_delay)
{
simply make sure to ignore it if `stopped_by_watchpoint' is
set. */
- if (debug_infrun
- && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
+ if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
&& !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
GDB_SIGNAL_TRAP)
&& stopped_by_watchpoint)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: no user watchpoint explains "
- "watchpoint SIGTRAP, ignoring\n");
+ {
+ infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, "
+ "ignoring");
+ }
/* NOTE: cagney/2003-03-29: These checks for a random signal
at one stage in the past included checks for an inferior
been removed. */
if (random_signal && target_stopped_by_sw_breakpoint ())
{
- if (program_breakpoint_here_p (gdbarch,
- ecs->event_thread->suspend.stop_pc))
+ if (gdbarch_program_breakpoint_here_p (gdbarch,
+ ecs->event_thread->suspend.stop_pc))
{
struct regcache *regcache;
int decr_pc;
else
{
/* A delayed software breakpoint event. Ignore the trap. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: delayed software breakpoint "
- "trap, ignoring\n");
+ infrun_log_debug ("delayed software breakpoint trap, ignoring");
random_signal = 0;
}
}
if (random_signal && target_stopped_by_hw_breakpoint ())
{
/* A delayed hardware breakpoint event. Ignore the trap. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: delayed hardware breakpoint/watchpoint "
- "trap, ignoring\n");
+ infrun_log_debug ("delayed hardware breakpoint/watchpoint "
+ "trap, ignoring");
random_signal = 0;
}
if (ecs->event_thread->stop_requested)
{
random_signal = 1;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n");
+ infrun_log_debug ("user-requested stop");
}
/* For the program's own signals, act according to
if (random_signal)
{
/* Signal not for debugging purposes. */
- struct inferior *inf = find_inferior_ptid (ecs->ptid);
+ struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n",
- gdb_signal_to_symbol_string (stop_signal));
+ infrun_log_debug ("random signal (%s)",
+ gdb_signal_to_symbol_string (stop_signal));
stopped_by_random_signal = 1;
code paths as single-step - set a breakpoint at the
signal return address and then, once hit, step off that
breakpoint. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: signal arrived while stepping over "
- "breakpoint\n");
+ infrun_log_debug ("signal arrived while stepping over breakpoint");
insert_hp_step_resume_breakpoint_at_frame (frame);
ecs->event_thread->step_after_step_resume_breakpoint = 1;
Note that this is only needed for a signal delivered
while in the single-step range. Nested signals aren't a
problem as they eventually all return. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: signal may take us out of "
- "single-step range\n");
+ infrun_log_debug ("signal may take us out of single-step range");
clear_step_over_info ();
insert_hp_step_resume_breakpoint_at_frame (frame);
if (!switch_back_to_stepped_thread (ecs))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: random signal, keep going\n");
+ infrun_log_debug ("random signal, keep going");
keep_going (ecs);
}
install a momentary breakpoint at the target of the
jmp_buf. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
+ infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME");
ecs->event_thread->stepping_over_breakpoint = 1;
|| !gdbarch_get_longjmp_target (gdbarch,
frame, &jmp_buf_pc))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME "
- "(!gdbarch_get_longjmp_target)\n");
+ infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME "
+ "(!gdbarch_get_longjmp_target)");
keep_going (ecs);
return;
}
against stale dummy frames and user is not interested in
stopping around longjmps. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
+ infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME");
gdb_assert (ecs->event_thread->control.exception_resume_breakpoint
!= NULL);
return;
case BPSTAT_WHAT_SINGLE:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n");
+ infrun_log_debug ("BPSTAT_WHAT_SINGLE");
ecs->event_thread->stepping_over_breakpoint = 1;
/* Still need to check other stuff, at least the case where we
are stepping and step out of the right range. */
break;
case BPSTAT_WHAT_STEP_RESUME:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
+ infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME");
delete_step_resume_breakpoint (ecs->event_thread);
if (ecs->event_thread->control.proceed_to_finish
break;
case BPSTAT_WHAT_STOP_NOISY:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
+ infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY");
stop_print_frame = 1;
/* Assume the thread stopped for a breapoint. We'll still check
return;
case BPSTAT_WHAT_STOP_SILENT:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
+ infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT");
stop_print_frame = 0;
/* Assume the thread stopped for a breapoint. We'll still check
return;
case BPSTAT_WHAT_HP_STEP_RESUME:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n");
+ infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME");
delete_step_resume_breakpoint (ecs->event_thread);
if (ecs->event_thread->step_after_step_resume_breakpoint)
&& sr_bp->type == bp_hp_step_resume
&& sr_bp->loc->address == ecs->event_thread->prev_pc)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped permanent breakpoint, stopped in "
- "handler\n");
+ infrun_log_debug ("stepped permanent breakpoint, stopped in handler");
delete_step_resume_breakpoint (ecs->event_thread);
ecs->event_thread->step_after_step_resume_breakpoint = 0;
}
if (ecs->event_thread->control.step_resume_breakpoint)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: step-resume breakpoint is inserted\n");
+ infrun_log_debug ("step-resume breakpoint is inserted");
/* Having a step-resume breakpoint overrides anything
else having to do with stepping commands until
if (ecs->event_thread->control.step_range_end == 0)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n");
+ infrun_log_debug ("no stepping, continue");
/* Likewise if we aren't even stepping. */
keep_going (ecs);
return;
|| frame_id_eq (get_frame_id (frame),
ecs->event_thread->control.step_frame_id)))
{
- if (debug_infrun)
- fprintf_unfiltered
- (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n",
- paddress (gdbarch, ecs->event_thread->control.step_range_start),
- paddress (gdbarch, ecs->event_thread->control.step_range_end));
+ infrun_log_debug
+ ("stepping inside range [%s-%s]",
+ paddress (gdbarch, ecs->event_thread->control.step_range_start),
+ paddress (gdbarch, ecs->event_thread->control.step_range_end));
/* Tentatively re-enable range stepping; `resume' disables it if
necessary (e.g., if we're stepping over a breakpoint or we
gdbarch_skip_solib_resolver (gdbarch,
ecs->event_thread->suspend.stop_pc);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into dynsym resolve code\n");
+ infrun_log_debug ("stepped into dynsym resolve code");
if (pc_after_resolver)
{
&& gdbarch_in_indirect_branch_thunk (gdbarch,
ecs->event_thread->suspend.stop_pc))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into indirect branch thunk\n");
+ infrun_log_debug ("stepped into indirect branch thunk");
keep_going (ecs);
return;
}
|| ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
&& get_frame_type (frame) == SIGTRAMP_FRAME)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into signal trampoline\n");
+ infrun_log_debug ("stepped into signal trampoline");
/* The inferior, while doing a "step" or "next", has ended up in
a signal trampoline (either by a signal being delivered or by
the signal handler returning). Just single-step until the
CORE_ADDR real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into solib return tramp\n");
+ infrun_log_debug ("stepped into solib return tramp");
/* Only proceed through if we know where it's going. */
if (real_stop_pc)
CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc;
CORE_ADDR real_stop_pc;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n");
+ infrun_log_debug ("stepped into subroutine");
if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE)
{
}
}
+ /* This always returns the sal for the inner-most frame when we are in a
+ stack of inlined frames, even if GDB actually believes that it is in a
+ more outer frame. This is checked for below by calls to
+ inline_skipped_frames. */
stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0);
/* NOTE: tausq/2004-05-24: This if block used to be done before all
&& ecs->stop_func_name == NULL
&& stop_pc_sal.line == 0)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into undebuggable function\n");
+ infrun_log_debug ("stepped into undebuggable function");
/* The inferior just stepped into, or returned to, an
undebuggable function (where there is no debugging information
{
/* It is stepi or nexti. We always want to stop stepping after
one instruction. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n");
+ infrun_log_debug ("stepi/nexti");
end_stepping_range (ecs);
return;
}
stepping (does this always happen right after one instruction,
when we do "s" in a function with no line numbers,
or can this happen as a result of a return or longjmp?). */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n");
+ infrun_log_debug ("line number info");
end_stepping_range (ecs);
return;
}
ecs->event_thread->control.step_frame_id)
&& inline_skipped_frames (ecs->event_thread))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped into inlined function\n");
+ infrun_log_debug ("stepped into inlined function");
symtab_and_line call_sal = find_frame_sal (get_current_frame ());
&& stepped_in_from (get_current_frame (),
ecs->event_thread->control.step_frame_id))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepping through inlined function\n");
+ infrun_log_debug ("stepping through inlined function");
if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL
|| inline_frame_is_marked_for_skip (false, ecs->event_thread))
return;
}
+ bool refresh_step_info = true;
if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc)
&& (ecs->event_thread->current_line != stop_pc_sal.line
|| ecs->event_thread->current_symtab != stop_pc_sal.symtab))
{
- /* We are at the start of a different line. So stop. Note that
- we don't stop if we step into the middle of a different line.
- That is said to make things like for (;;) statements work
- better. */
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: stepped to a different line\n");
- end_stepping_range (ecs);
- return;
+ if (stop_pc_sal.is_stmt)
+ {
+ /* We are at the start of a different line. So stop. Note that
+ we don't stop if we step into the middle of a different line.
+ That is said to make things like for (;;) statements work
+ better. */
+ infrun_log_debug ("infrun: stepped to a different line\n");
+ end_stepping_range (ecs);
+ return;
+ }
+ else if (frame_id_eq (get_frame_id (get_current_frame ()),
+ ecs->event_thread->control.step_frame_id))
+ {
+ /* We are at the start of a different line, however, this line is
+ not marked as a statement, and we have not changed frame. We
+ ignore this line table entry, and continue stepping forward,
+ looking for a better place to stop. */
+ refresh_step_info = false;
+ infrun_log_debug ("infrun: stepped to a different line, but "
+ "it's not the start of a statement\n");
+ }
}
/* We aren't done stepping.
Optimize by setting the stepping range to the line.
(We might not be in the original line, but if we entered a
new line in mid-statement, we continue stepping. This makes
- things like for(;;) statements work better.) */
+ things like for(;;) statements work better.)
+
+ If we entered a SAL that indicates a non-statement line table entry,
+ then we update the stepping range, but we don't update the step info,
+ which includes things like the line number we are stepping away from.
+ This means we will stop when we find a line table entry that is marked
+ as is-statement, even if it matches the non-statement one we just
+ stepped into. */
ecs->event_thread->control.step_range_start = stop_pc_sal.pc;
ecs->event_thread->control.step_range_end = stop_pc_sal.end;
ecs->event_thread->control.may_range_step = 1;
- set_step_info (frame, stop_pc_sal);
+ if (refresh_step_info)
+ set_step_info (ecs->event_thread, frame, stop_pc_sal);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n");
+ infrun_log_debug ("keep going");
keep_going (ecs);
}
if (ecs->event_thread->control.trap_expected
&& ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP)
{
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: need to finish step-over of [%s]\n",
- target_pid_to_str (ecs->event_thread->ptid).c_str ());
- }
+ infrun_log_debug ("need to finish step-over of [%s]",
+ target_pid_to_str (ecs->event_thread->ptid).c_str ());
keep_going (ecs);
return 1;
}
breakpoint of another thread. */
if (ecs->hit_singlestep_breakpoint)
{
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: need to step [%s] over single-step "
- "breakpoint\n",
- target_pid_to_str (ecs->ptid).c_str ());
- }
+ infrun_log_debug ("need to step [%s] over single-step breakpoint",
+ target_pid_to_str (ecs->ptid).c_str ());
keep_going (ecs);
return 1;
}
another thread. */
if (thread_still_needs_step_over (ecs->event_thread))
{
- if (debug_infrun)
- {
- fprintf_unfiltered (gdb_stdlog,
- "infrun: thread [%s] still needs step-over\n",
- target_pid_to_str (ecs->event_thread->ptid).c_str ());
- }
+ infrun_log_debug
+ ("thread [%s] still needs step-over",
+ target_pid_to_str (ecs->event_thread->ptid).c_str ());
keep_going (ecs);
return 1;
}
/* Ignore threads of processes the caller is not
resuming. */
if (!sched_multi
- && tp->ptid.pid () != ecs->ptid.pid ())
+ && (tp->inf->process_target () != ecs->target
+ || tp->inf->pid != ecs->ptid.pid ()))
continue;
/* When stepping over a breakpoint, we lock all threads
if (stepping_thread != NULL)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: switching back to stepped thread\n");
+ infrun_log_debug ("switching back to stepped thread");
if (keep_going_stepped_thread (stepping_thread))
{
if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: not resuming previously "
- "stepped thread, it has vanished\n");
+ infrun_log_debug ("not resuming previously stepped thread, it has "
+ "vanished");
delete_thread (tp);
return 0;
}
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: resuming previously stepped thread\n");
+ infrun_log_debug ("resuming previously stepped thread");
reset_ecs (ecs, tp);
switch_to_thread (tp);
{
ptid_t resume_ptid;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: expected thread advanced also (%s -> %s)\n",
- paddress (target_gdbarch (), tp->prev_pc),
- paddress (target_gdbarch (), tp->suspend.stop_pc));
+ infrun_log_debug ("expected thread advanced also (%s -> %s)",
+ paddress (target_gdbarch (), tp->prev_pc),
+ paddress (target_gdbarch (), tp->suspend.stop_pc));
/* Clear the info of the previous step-over, as it's no longer
valid (if the thread was trying to step over a breakpoint, it
get_frame_address_space (frame),
tp->suspend.stop_pc);
- tp->resumed = 1;
+ tp->resumed = true;
resume_ptid = internal_resume_ptid (tp->control.stepping_command);
do_target_resume (resume_ptid, 0, GDB_SIGNAL_0);
}
else
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: expected thread still hasn't advanced\n");
+ infrun_log_debug ("expected thread still hasn't advanced");
keep_going_pass_signal (ecs);
}
gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL);
gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: inserting step-resume breakpoint at %s\n",
- paddress (gdbarch, sr_sal.pc));
+ infrun_log_debug ("inserting step-resume breakpoint at %s",
+ paddress (gdbarch, sr_sal.pc));
inferior_thread ()->control.step_resume_breakpoint
= set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release ();
longjmp_resume_breakpoint when one is already active. */
gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: inserting longjmp-resume breakpoint at %s\n",
- paddress (gdbarch, pc));
+ infrun_log_debug ("inserting longjmp-resume breakpoint at %s",
+ paddress (gdbarch, pc));
inferior_thread ()->control.exception_resume_breakpoint =
set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release ();
{
handler = value_as_address (value);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: exception resume at %lx\n",
- (unsigned long) handler);
+ infrun_log_debug ("exception resume at %lx",
+ (unsigned long) handler);
bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
handler,
handler = value_as_address (arg_value);
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: exception resume at %s\n",
- paddress (get_objfile_arch (probe->objfile),
- handler));
+ infrun_log_debug ("exception resume at %s",
+ paddress (probe->objfile->arch (), handler));
bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
handler, bp_exception_resume).release ();
static void
stop_waiting (struct execution_control_state *ecs)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n");
+ infrun_log_debug ("stop_waiting");
/* Let callers know we don't want to wait for the inferior anymore. */
ecs->wait_some_more = 0;
- /* If all-stop, but the target is always in non-stop mode, stop all
+ /* If all-stop, but there exists a non-stop target, stop all
threads now that we're presenting the stop to the user. */
- if (!non_stop && target_is_non_stop_p ())
+ if (!non_stop && exists_non_stop_target ())
stop_all_threads ();
}
/* Save the pc before execution, to compare with pc after stop. */
ecs->event_thread->prev_pc
- = regcache_read_pc (get_thread_regcache (ecs->event_thread));
+ = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread));
if (ecs->event_thread->control.trap_expected)
{
struct thread_info *tp = ecs->event_thread;
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: %s has trap_expected set, "
- "resuming to collect trap\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("%s has trap_expected set, "
+ "resuming to collect trap",
+ target_pid_to_str (tp->ptid).c_str ());
/* We haven't yet gotten our trap, and either: intercepted a
non-signal event (e.g., a fork); or took a signal which we
if (ecs->hit_singlestep_breakpoint
|| thread_still_needs_step_over (tp))
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: step-over already in progress: "
- "step-over for %s deferred\n",
- target_pid_to_str (tp->ptid).c_str ());
- thread_step_over_chain_enqueue (tp);
+ infrun_log_debug ("step-over already in progress: "
+ "step-over for %s deferred",
+ target_pid_to_str (tp->ptid).c_str ());
+ global_thread_step_over_chain_enqueue (tp);
}
else
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: step-over in progress: "
- "resume of %s deferred\n",
- target_pid_to_str (tp->ptid).c_str ());
+ infrun_log_debug ("step-over in progress: resume of %s deferred",
+ target_pid_to_str (tp->ptid).c_str ());
}
}
else
static void
prepare_to_wait (struct execution_control_state *ecs)
{
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n");
+ infrun_log_debug ("prepare_to_wait");
ecs->wait_some_more = 1;
print_stop_event (struct ui_out *uiout, bool displays)
{
struct target_waitstatus last;
- ptid_t last_ptid;
struct thread_info *tp;
- get_last_target_status (&last_ptid, &last);
+ get_last_target_status (nullptr, nullptr, &last);
{
scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout);
normal_stop (void)
{
struct target_waitstatus last;
- ptid_t last_ptid;
- get_last_target_status (&last_ptid, &last);
+ get_last_target_status (nullptr, nullptr, &last);
new_stop_id ();
frontend/user running state. A QUIT is an easy exception to see
here, so do this before any filtered output. */
- gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state;
+ ptid_t finish_ptid = null_ptid;
if (!non_stop)
- maybe_finish_thread_state.emplace (minus_one_ptid);
+ finish_ptid = minus_one_ptid;
else if (last.kind == TARGET_WAITKIND_SIGNALLED
|| last.kind == TARGET_WAITKIND_EXITED)
{
linux-fork.c automatically switches to another fork from
within target_mourn_inferior. */
if (inferior_ptid != null_ptid)
- maybe_finish_thread_state.emplace (ptid_t (inferior_ptid.pid ()));
+ finish_ptid = ptid_t (inferior_ptid.pid ());
}
else if (last.kind != TARGET_WAITKIND_NO_RESUMED)
- maybe_finish_thread_state.emplace (inferior_ptid);
+ finish_ptid = inferior_ptid;
+
+ gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state;
+ if (finish_ptid != null_ptid)
+ {
+ maybe_finish_thread_state.emplace
+ (user_visible_resume_target (finish_ptid), finish_ptid);
+ }
/* As we're presenting a stop, and potentially removing breakpoints,
update the thread list so we can tell whether there are threads
inferior_event_handler (INF_REG_EVENT, NULL);
}
+void _initialize_infrun ();
void
-_initialize_infrun (void)
+_initialize_infrun ()
{
struct cmd_list_element *c;
projects / deliverable / binutils-gdb.git / blobdiff