/* Target-struct-independent code to start (run) and stop an inferior
process.
- Copyright (C) 1986-2020 Free Software Foundation, Inc.
+ Copyright (C) 1986-2021 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "displaced-stepping.h"
#include "infrun.h"
#include <ctype.h>
#include "symtab.h"
/* See infrun.h. */
-void
-infrun_debug_printf_1 (const char *func_name, const char *fmt, ...)
-{
- va_list ap;
- va_start (ap, fmt);
- debug_prefixed_vprintf ("infrun", func_name, fmt, ap);
- va_end (ap);
-}
-
-/* See infrun.h. */
-
void
infrun_async (int enable)
{
static bool detach_fork = true;
-bool debug_displaced = false;
-static void
-show_debug_displaced (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
-{
- fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value);
-}
-
-unsigned int debug_infrun = 0;
+bool debug_infrun = false;
static void
show_debug_infrun (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
fprintf_filtered (file, _("Inferior debugging is %s.\n"), value);
}
-
/* Support for disabling address space randomization. */
bool disable_randomization = true;
non-stop, in which all GDB operations that might affect the
target's execution have been disabled. */
-bool observer_mode = false;
+static bool observer_mode = false;
static bool observer_mode_1 = false;
static void
set_current_inferior (child_inf);
switch_to_no_thread ();
child_inf->symfile_flags = SYMFILE_NO_READ;
- push_target (parent_inf->process_target ());
+ child_inf->push_target (parent_inf->process_target ());
thread_info *child_thr
= add_thread_silent (child_inf->process_target (), child_ptid);
informing the solib layer about this new process. */
set_current_inferior (child_inf);
- push_target (target);
+ child_inf->push_target (target);
}
thread_info *child_thr = add_thread_silent (target, child_ptid);
inferior *org_inferior = current_inferior ();
switch_to_inferior_no_thread (inf);
- push_target (org_inferior->process_target ());
+ inf->push_target (org_inferior->process_target ());
thread_info *thr = add_thread (inf->process_target (), ptid);
switch_to_thread (thr);
}
registers. */
target_find_description ();
- solib_create_inferior_hook (0);
-
- jit_inferior_created_hook ();
+ gdb::observers::inferior_execd.notify (inf);
breakpoint_re_set ();
matically get reset there in the new process.). */
}
-/* The queue of threads that need to do a step-over operation to get
+/* The chain of threads that need to do a step-over operation to get
past e.g., a breakpoint. What technique is used to step over the
breakpoint/watchpoint does not matter -- all threads end up in the
same queue, to maintain rough temporal order of execution, in order
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. */
and address of the instruction the breakpoint is set at. We'll
skip inserting all breakpoints here. Valid iff ASPACE is
non-NULL. */
- const address_space *aspace;
- CORE_ADDR address;
+ const address_space *aspace = nullptr;
+ CORE_ADDR address = 0;
/* The instruction being stepped over triggers a nonsteppable
watchpoint. If true, we'll skip inserting watchpoints. */
- int nonsteppable_watchpoint_p;
+ int nonsteppable_watchpoint_p = 0;
/* The thread's global number. */
- int thread;
+ int thread = -1;
};
/* The step-over info of the location that is being stepped over.
place it in the displaced_step_request_queue. Whenever a displaced
step finishes, we pick the next thread in the queue and start a new
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 inferior INF. */
+ displaced_step_finish for details. */
-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. */
-
-static bool
-displaced_step_in_progress_any_inferior ()
-{
- for (inferior *i : all_inferiors ())
- {
- if (i->displaced_step_state.step_thread != nullptr)
- return true;
- }
-
- return false;
-}
-
-/* Return true if thread represented by PTID is doing a displaced
- step. */
+/* Return true if THREAD is doing a displaced step. */
static bool
displaced_step_in_progress_thread (thread_info *thread)
{
gdb_assert (thread != NULL);
- return get_displaced_stepping_state (thread->inf)->step_thread == thread;
+ return thread->displaced_step_state.in_progress ();
}
-/* Return true if process PID has a thread doing a displaced step. */
+/* Return true if INF has a thread doing a displaced step. */
static bool
displaced_step_in_progress (inferior *inf)
{
- return get_displaced_stepping_state (inf)->step_thread != nullptr;
+ return inf->displaced_step_state.in_progress_count > 0;
}
-/* 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 ());
-
- /* If checking the mode of displaced instruction in copy area. */
- if (displaced->step_thread != nullptr
- && displaced->step_copy == addr)
- return displaced->step_closure.get ();
+ for (inferior *inf : all_non_exited_inferiors ())
+ {
+ if (displaced_step_in_progress (inf))
+ return true;
+ }
- return NULL;
+ return false;
}
static void
inf->displaced_step_state.reset ();
}
+static void
+infrun_inferior_execd (inferior *inf)
+{
+ /* If some threads where was doing a displaced step in this inferior at the
+ moment of the exec, they no longer exist. Even if the exec'ing thread
+ doing a displaced step, we don't want to to any fixup nor restore displaced
+ stepping buffer bytes. */
+ inf->displaced_step_state.reset ();
+
+ for (thread_info *thread : inf->threads ())
+ thread->displaced_step_state.reset ();
+
+ /* Since an in-line step is done with everything else stopped, if there was
+ one in progress at the time of the exec, it must have been the exec'ing
+ thread. */
+ clear_step_over_info ();
+}
+
/* If ON, and the architecture supports it, GDB will use displaced
stepping to step over breakpoints. If OFF, or if the architecture
doesn't support it, GDB will instead use the traditional
static bool
gdbarch_supports_displaced_stepping (gdbarch *arch)
{
- /* Only check for the presence of step_copy_insn. Other required methods
- are checked by the gdbarch validation. */
- return gdbarch_displaced_step_copy_insn_p (arch);
+ /* Only check for the presence of `prepare`. The gdbarch verification ensures
+ that if `prepare` is provided, so is `finish`. */
+ return gdbarch_displaced_step_prepare_p (arch);
}
/* Return non-zero if displaced stepping can/should be used to step
if (find_record_target () != nullptr)
return false;
- displaced_step_inferior_state *displaced_state
- = get_displaced_stepping_state (tp->inf);
-
/* If displaced stepping failed before for this inferior, don't bother trying
again. */
- if (displaced_state->failed_before)
+ if (tp->inf->displaced_step_state.failed_before)
return false;
return true;
}
-/* Simple function wrapper around displaced_step_inferior_state::reset. */
+/* Simple function wrapper around displaced_step_thread_state::reset. */
static void
-displaced_step_reset (displaced_step_inferior_state *displaced)
+displaced_step_reset (displaced_step_thread_state *displaced)
{
displaced->reset ();
}
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
-displaced_step_dump_bytes (struct ui_file *file,
- const gdb_byte *buf,
- size_t len)
+/* See infrun.h. */
+
+std::string
+displaced_step_dump_bytes (const gdb_byte *buf, size_t len)
{
- int i;
+ std::string ret;
- for (i = 0; i < len; i++)
- fprintf_unfiltered (file, "%02x ", buf[i]);
- fputs_unfiltered ("\n", file);
+ for (size_t i = 0; i < len; i++)
+ {
+ if (i == 0)
+ ret += string_printf ("%02x", buf[i]);
+ else
+ ret += string_printf (" %02x", buf[i]);
+ }
+
+ return ret;
}
/* Prepare to single-step, using displaced stepping.
Comments in the code for 'random signals' in handle_inferior_event
explain how we handle this case instead.
- Returns 1 if preparing was successful -- this thread is going to be
- stepped now; 0 if displaced stepping this thread got queued; or -1
- if this instruction can't be displaced stepped. */
+ Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this
+ thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE
+ if displaced stepping this thread got queued; or
+ DISPLACED_STEP_PREPARE_STATUS_CANT 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;
- int status;
+ displaced_step_thread_state &disp_step_thread_state
+ = tp->displaced_step_state;
/* We should never reach this function if the architecture does not
support displaced stepping. */
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. */
+ /* We are about to start a displaced step for this thread. If one is already
+ in progress, something's wrong. */
+ gdb_assert (!disp_step_thread_state.in_progress ());
- displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (tp->inf);
-
- if (displaced->step_thread != nullptr)
+ if (tp->inf->displaced_step_state.unavailable)
{
- /* Already waiting for a displaced step to finish. Defer this
- request and place in queue. */
+ /* The gdbarch tells us it's not worth asking to try a prepare because
+ it is likely that it will return unavailable, so don't bother asking. */
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: deferring step of %s\n",
- target_pid_to_str (tp->ptid).c_str ());
+ displaced_debug_printf ("deferring step of %s",
+ 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 ());
+ global_thread_step_over_chain_enqueue (tp);
+ return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
}
- displaced_step_reset (displaced);
+ displaced_debug_printf ("displaced-stepping %s now",
+ target_pid_to_str (tp->ptid).c_str ());
scoped_restore_current_thread restore_thread;
switch_to_thread (tp);
- original = regcache_read_pc (regcache);
+ CORE_ADDR original_pc = regcache_read_pc (regcache);
+ CORE_ADDR displaced_pc;
- copy = gdbarch_displaced_step_location (gdbarch);
- len = gdbarch_max_insn_length (gdbarch);
+ displaced_step_prepare_status status
+ = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc);
- if (breakpoint_in_range_p (aspace, copy, len))
+ if (status == DISPLACED_STEP_PREPARE_STATUS_CANT)
{
- /* 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");
- }
+ displaced_debug_printf ("failed to prepare (%s)",
+ target_pid_to_str (tp->ptid).c_str ());
- return -1;
+ return DISPLACED_STEP_PREPARE_STATUS_CANT;
}
-
- /* 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. */
- displaced->step_closure
- = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache);
- if (displaced->step_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;
+ displaced_debug_printf ("not enough resources available, "
+ "deferring step of %s",
+ target_pid_to_str (tp->ptid).c_str ());
+
+ global_thread_step_over_chain_enqueue (tp);
+
+ return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
}
+ gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK);
+
/* Save the information we need to fix things up if the step
succeeds. */
- displaced->step_thread = tp;
- displaced->step_gdbarch = gdbarch;
- displaced->step_original = original;
- displaced->step_copy = copy;
+ disp_step_thread_state.set (gdbarch);
- {
- displaced_step_reset_cleanup cleanup (displaced);
-
- /* Resume execution at the copy. */
- regcache_write_pc (regcache, copy);
-
- cleanup.release ();
- }
+ tp->inf->displaced_step_state.in_progress_count++;
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n",
- paddress (gdbarch, copy));
+ displaced_debug_printf ("prepared successfully thread=%s, "
+ "original_pc=%s, displaced_pc=%s",
+ 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_CANT;
try
{
- prepared = displaced_step_prepare_throw (thread);
+ status = displaced_step_prepare_throw (thread);
}
catch (const gdb_exception_error &ex)
{
- struct displaced_step_inferior_state *displaced_state;
-
if (ex.error != MEMORY_ERROR
&& ex.error != NOT_SUPPORTED_ERROR)
throw;
}
/* Disable further displaced stepping attempts. */
- displaced_state
- = get_displaced_stepping_state (thread->inf);
- displaced_state->failed_before = 1;
+ thread->inf->displaced_step_state.failed_before = 1;
}
- return prepared;
+ return status;
}
-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);
-}
+/* If we displaced stepped an instruction successfully, adjust registers and
+ memory to yield the same effect the instruction would have had if we had
+ executed it at its original address, and return
+ DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete,
+ relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED.
-/* Restore the contents of the copy area for thread PTID. */
+ If the thread wasn't displaced stepping, return
+ DISPLACED_STEP_FINISH_STATUS_OK as well. */
-static void
-displaced_step_restore (struct displaced_step_inferior_state *displaced,
- ptid_t ptid)
+static displaced_step_finish_status
+displaced_step_finish (thread_info *event_thread, enum gdb_signal signal)
{
- 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));
-}
+ displaced_step_thread_state *displaced = &event_thread->displaced_step_state;
-/* If we displaced stepped an instruction successfully, adjust
- registers and memory to yield the same effect the instruction would
- have had if we had executed it at its original address, and return
- 1. If the instruction didn't complete, relocate the PC and return
- -1. If the thread wasn't displaced stepping, return 0. */
+ /* Was this thread performing a displaced step? */
+ if (!displaced->in_progress ())
+ return DISPLACED_STEP_FINISH_STATUS_OK;
-static int
-displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal)
-{
- struct displaced_step_inferior_state *displaced
- = get_displaced_stepping_state (event_thread->inf);
- int ret;
-
- /* Was this event for the thread we displaced? */
- if (displaced->step_thread != event_thread)
- return 0;
+ gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0);
+ event_thread->inf->displaced_step_state.in_progress_count--;
/* Fixup may need to read memory/registers. Switch to the thread
that we're fixing up. Also, target_stopped_by_watchpoint checks
displaced_step_reset_cleanup cleanup (displaced);
- displaced_step_restore (displaced, displaced->step_thread->ptid);
-
- /* 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.get (),
- 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;
- }
-
- return ret;
+ /* Do the fixup, and release the resources acquired to do the displaced
+ step. */
+ return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (),
+ event_thread, signal);
}
/* Data to be passed around while handling an event. This data is
static bool
start_step_over (void)
{
- struct thread_info *tp, *next;
+ INFRUN_SCOPED_DEBUG_ENTER_EXIT;
+
+ thread_info *next;
/* 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 false;
- for (tp = step_over_queue_head; tp != NULL; tp = next)
+ /* Steal the global thread step over chain. As we try to initiate displaced
+ steps, threads will be enqueued in the global chain if no buffers are
+ available. If we iterated on the global chain directly, we might iterate
+ indefinitely. */
+ thread_info *threads_to_step = global_thread_step_over_chain_head;
+ global_thread_step_over_chain_head = NULL;
+
+ infrun_debug_printf ("stealing global queue of threads to step, length = %d",
+ thread_step_over_chain_length (threads_to_step));
+
+ bool started = false;
+
+ /* On scope exit (whatever the reason, return or exception), if there are
+ threads left in the THREADS_TO_STEP chain, put back these threads in the
+ global list. */
+ SCOPE_EXIT
+ {
+ if (threads_to_step == nullptr)
+ infrun_debug_printf ("step-over queue now empty");
+ else
+ {
+ infrun_debug_printf ("putting back %d threads to step in global queue",
+ thread_step_over_chain_length (threads_to_step));
+
+ global_thread_step_over_chain_enqueue_chain (threads_to_step);
+ }
+ };
+
+ for (thread_info *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);
+ next = thread_step_over_chain_next (threads_to_step, 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;
+ if (tp->inf->displaced_step_state.unavailable)
+ {
+ /* The arch told us to not even try preparing another displaced step
+ for this inferior. Just leave the thread in THREADS_TO_STEP, it
+ will get moved to the global chain on scope exit. */
+ continue;
+ }
+
+ /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong
+ while we try to prepare the displaced step, we don't add it back to
+ the global step over chain. This is to avoid a thread staying in the
+ step over chain indefinitely if something goes wrong when resuming it
+ If the error is intermittent and it still needs a step over, it will
+ get enqueued again when we try to resume it normally. */
+ thread_step_over_chain_remove (&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 false;
-
- thread_step_over_chain_remove (tp);
-
- if (step_over_queue_head == NULL)
- infrun_debug_printf ("step-over queue now empty");
+ if (must_be_in_line && displaced_step_in_progress_any_thread ())
+ {
+ global_thread_step_over_chain_enqueue (tp);
+ continue;
+ }
if (tp->control.trap_expected
|| tp->resumed
if (!ecs->wait_some_more)
error (_("Command aborted."));
- gdb_assert (tp->resumed);
+ /* If the thread's step over could not be initiated because no buffers
+ were available, it was re-added to the global step over chain. */
+ if (tp->resumed)
+ {
+ infrun_debug_printf ("[%s] was resumed.",
+ target_pid_to_str (tp->ptid).c_str ());
+ gdb_assert (!thread_is_in_step_over_chain (tp));
+ }
+ else
+ {
+ infrun_debug_printf ("[%s] was NOT resumed.",
+ 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 true;
+ started = true;
+ 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 true;
+ started = true;
+ break;
}
/* Either the thread no longer needed a step-over, or a new
displaced step on a thread of other process. */
}
- return false;
+ return started;
}
/* Update global variables holding ptids to hold NEW_PTID if they were
Likewise if we're displaced stepping, otherwise a trap for a
breakpoint in a signal handler might be confused with the
- displaced step finishing. We don't make the displaced_step_fixup
+ displaced step finishing. We don't make the displaced_step_finish
step distinguish the cases instead, because:
- a backtrace while stopped in the signal handler would show 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)
{
infrun_debug_printf ("Got placed in step-over queue");
tp->control.trap_expected = 0;
return;
}
- else if (prepared < 0)
+ else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT)
{
/* 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.get ());
+ step = gdbarch_displaced_step_hw_singlestep (gdbarch);
}
+ else
+ gdb_assert_not_reached (_("Invalid displaced_step_prepare_status "
+ "value."));
}
/* Do we need to do it the hard way, w/temp breakpoints? */
record that we tried to step a breakpoint instruction, so
that adjust_pc_after_break doesn't end up confused.
- - In non-stop if we insert a breakpoint (e.g., a step-resume)
+ - In non-stop if we insert a breakpoint (e.g., a step-resume)
in one thread after another thread that was stepping had been
momentarily paused for a step-over. When we re-resume the
stepping thread, it may be resumed from that address with a
CORE_ADDR actual_pc = regcache_read_pc (resume_regcache);
gdb_byte buf[4];
- fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ",
- paddress (resume_gdbarch, actual_pc));
read_memory (actual_pc, buf, sizeof (buf));
- displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
+ displaced_debug_printf ("run %s: %s",
+ paddress (resume_gdbarch, actual_pc),
+ displaced_step_dump_bytes
+ (buf, sizeof (buf)).c_str ());
}
if (tp->control.may_range_step)
always-non-stop mode. */
inferior *first_not_non_stop = nullptr;
- for (inferior *inf : all_non_exited_inferiors (resume_target))
+ for (inferior *inf : all_non_exited_inferiors ())
{
switch_to_inferior_no_thread (inf);
void
proceed (CORE_ADDR addr, enum gdb_signal siggnal)
{
+ INFRUN_SCOPED_DEBUG_ENTER_EXIT;
+
struct regcache *regcache;
struct gdbarch *gdbarch;
CORE_ADDR pc;
infrun_debug_printf ("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
}
else if (!non_stop && target_is_non_stop_p ())
{
+ INFRUN_SCOPED_DEBUG_START_END
+ ("resuming threads, all-stop-on-top-of-non-stop");
+
/* 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_target,
}
infrun_debug_printf ("resuming %s",
- target_pid_to_str (tp->ptid).c_str ());
+ target_pid_to_str (tp->ptid).c_str ());
reset_ecs (ecs, tp);
switch_to_thread (tp);
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
print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid,
const struct target_waitstatus *ws)
{
- std::string status_string = target_waitstatus_to_string (ws);
- string_file stb;
-
- /* The text is split over several lines because it was getting too long.
- Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
- output as a unit; we want only one timestamp printed if debug_timestamp
- is set. */
-
- stb.printf ("[infrun] target_wait (%d.%ld.%ld",
- waiton_ptid.pid (),
- waiton_ptid.lwp (),
- waiton_ptid.tid ());
- if (waiton_ptid.pid () != -1)
- stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ());
- stb.printf (", status) =\n");
- stb.printf ("[infrun] %d.%ld.%ld [%s],\n",
- result_ptid.pid (),
- result_ptid.lwp (),
- result_ptid.tid (),
- target_pid_to_str (result_ptid).c_str ());
- stb.printf ("[infrun] %s\n", status_string.c_str ());
-
- /* This uses %s in part to handle %'s in the text, but also to avoid
- a gcc error: the format attribute requires a string literal. */
- fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ());
+ infrun_debug_printf ("target_wait (%d.%ld.%ld [%s], status) =",
+ waiton_ptid.pid (),
+ waiton_ptid.lwp (),
+ waiton_ptid.tid (),
+ target_pid_to_str (waiton_ptid).c_str ());
+ infrun_debug_printf (" %d.%ld.%ld [%s],",
+ result_ptid.pid (),
+ result_ptid.lwp (),
+ result_ptid.tid (),
+ target_pid_to_str (result_ptid).c_str ());
+ infrun_debug_printf (" %s", target_waitstatus_to_string (ws).c_str ());
}
/* Select a thread at random, out of those which are resumed and have
return false;
}
+/* 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;
+};
+
+static bool handle_one (const wait_one_event &event);
+static void restart_threads (struct thread_info *event_thread);
+
/* 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);
-
- /* Is any thread of this process displaced stepping? If not,
- there's nothing else to do. */
- if (displaced->step_thread == nullptr)
- return;
-
- infrun_debug_printf ("displaced-stepping in-process while detaching");
+ scoped_restore_current_thread restore_thread;
scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true);
- while (displaced->step_thread != nullptr)
+ /* Remove all threads of INF from the global step-over chain. We
+ want to stop any ongoing step-over, not start any new one. */
+ thread_info *next;
+ for (thread_info *tp = global_thread_step_over_chain_head;
+ tp != nullptr;
+ tp = next)
{
- struct execution_control_state ecss;
- struct execution_control_state *ecs;
-
- ecs = &ecss;
- memset (ecs, 0, sizeof (*ecs));
+ next = global_thread_step_over_chain_next (tp);
+ if (tp->inf == inf)
+ global_thread_step_over_chain_remove (tp);
+ }
- overlay_cache_invalid = 1;
- /* Flush target cache before starting to handle each event.
- Target was running and cache could be stale. This is just a
- heuristic. Running threads may modify target memory, but we
- don't get any event. */
- target_dcache_invalidate ();
+ /* If we were already in the middle of an inline step-over, and the
+ thread stepping belongs to the inferior we're detaching, we need
+ to restart the threads of other inferiors. */
+ if (step_over_info.thread != -1)
+ {
+ infrun_debug_printf ("inline step-over in-process while detaching");
- do_target_wait (pid_ptid, ecs, 0);
+ thread_info *thr = find_thread_global_id (step_over_info.thread);
+ if (thr->inf == inf)
+ {
+ /* Since we removed threads of INF from the step-over chain,
+ we know this won't start a step-over for INF. */
+ clear_step_over_info ();
- if (debug_infrun)
- print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws);
+ if (target_is_non_stop_p ())
+ {
+ /* Start a new step-over in another thread if there's
+ one that needs it. */
+ start_step_over ();
+
+ /* Restart all other threads (except the
+ previously-stepping thread, since that one is still
+ running). */
+ if (!step_over_info_valid_p ())
+ restart_threads (thr);
+ }
+ }
+ }
- /* 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 (inf->process_target (),
- minus_one_ptid);
+ if (displaced_step_in_progress (inf))
+ {
+ infrun_debug_printf ("displaced-stepping in-process while detaching");
- /* Now figure out what to do with the result of the result. */
- handle_inferior_event (ecs);
+ /* Stop threads currently displaced stepping, aborting it. */
- /* No error, don't finish the state yet. */
- finish_state.release ();
+ for (thread_info *thr : inf->non_exited_threads ())
+ {
+ if (thr->displaced_step_state.in_progress ())
+ {
+ if (thr->executing)
+ {
+ if (!thr->stop_requested)
+ {
+ target_stop (thr->ptid);
+ thr->stop_requested = true;
+ }
+ }
+ else
+ thr->resumed = false;
+ }
+ }
- /* Breakpoints and watchpoints are not installed on the target
- at this point, and signals are passed directly to the
- inferior, so this must mean the process is gone. */
- if (!ecs->wait_some_more)
+ while (displaced_step_in_progress (inf))
{
- restore_detaching.release ();
- error (_("Program exited while detaching"));
+ wait_one_event event;
+
+ event.target = inf->process_target ();
+ event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0);
+
+ if (debug_infrun)
+ print_target_wait_results (pid_ptid, event.ptid, &event.ws);
+
+ handle_one (event);
}
- }
- restore_detaching.release ();
+ /* It's OK to leave some of the threads of INF stopped, since
+ they'll be detached shortly. */
+ }
}
/* Wait for control to return from inferior to debugger.
if (!non_stop)
{
for (thread_info *thr : all_non_exited_threads ())
- {
+ {
if (thr->thread_fsm == NULL)
continue;
if (thr == ecs->event_thread)
void
fetch_inferior_event ()
{
+ INFRUN_SCOPED_DEBUG_ENTER_EXIT;
+
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
int cmd_done = 0;
the main console. */
scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui);
+ /* Temporarily disable pagination. Otherwise, the user would be
+ given an option to press 'q' to quit, which would cause an early
+ exit and could leave GDB in a half-baked state. */
+ scoped_restore save_pagination
+ = make_scoped_restore (&pagination_enabled, false);
+
/* End up with readline processing input, if necessary. */
{
SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); };
if (!ecs->wait_some_more)
{
struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
- int should_stop = 1;
+ bool should_stop = true;
struct thread_info *thr = ecs->event_thread;
delete_just_stopped_threads_infrun_breakpoints ();
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
set_resumed (target, mark_ptid, false);
}
+/* Handle one event after stopping threads. If the eventing thread
+ reports back any interesting event, we leave it pending. If the
+ eventing thread was in the middle of a displaced step, we
+ cancel/finish it, and unless the thread's inferior is being
+ detached, put the thread back in the step-over chain. Returns true
+ if there are no resumed threads left in the target (thus there's no
+ point in waiting further), false otherwise. */
+
+static bool
+handle_one (const wait_one_event &event)
+{
+ infrun_debug_printf
+ ("%s %s", target_waitstatus_to_string (&event.ws).c_str (),
+ target_pid_to_str (event.ptid).c_str ());
+
+ if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED)
+ {
+ /* All resumed threads exited. */
+ return true;
+ }
+ else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED
+ || event.ws.kind == TARGET_WAITKIND_EXITED
+ || event.ws.kind == TARGET_WAITKIND_SIGNALLED)
+ {
+ /* One thread/process exited/signalled. */
+
+ 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 ())
+ {
+ int pid = event.ptid.pid ();
+ inferior *inf = find_inferior_pid (event.target, pid);
+ for (thread_info *tp : inf->non_exited_threads ())
+ {
+ t = tp;
+ break;
+ }
+
+ /* 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_debug_printf
+ ("using %s", 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
+ {
+ 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)
+ {
+ switch_to_thread_no_regs (t);
+ setup_inferior (0);
+ }
+
+ 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;
+
+ if (displaced_step_finish (t, GDB_SIGNAL_0)
+ == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED)
+ {
+ /* Add it back to the step-over queue. */
+ infrun_debug_printf
+ ("displaced-step of %s canceled",
+ target_pid_to_str (t->ptid).c_str ());
+
+ t->control.trap_expected = 0;
+ if (!t->inf->detaching)
+ global_thread_step_over_chain_enqueue (t);
+ }
+ }
+ else
+ {
+ enum gdb_signal sig;
+ struct regcache *regcache;
+
+ infrun_debug_printf
+ ("target_wait %s, saving status for %d.%ld.%ld",
+ target_waitstatus_to_string (&event.ws).c_str (),
+ t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ());
+
+ /* Record for later. */
+ save_waitstatus (t, &event.ws);
+
+ sig = (event.ws.kind == TARGET_WAITKIND_STOPPED
+ ? event.ws.value.sig : GDB_SIGNAL_0);
+
+ if (displaced_step_finish (t, sig)
+ == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED)
+ {
+ /* Add it back to the step-over queue. */
+ t->control.trap_expected = 0;
+ if (!t->inf->detaching)
+ global_thread_step_over_chain_enqueue (t);
+ }
+
+ regcache = get_thread_regcache (t);
+ t->suspend.stop_pc = regcache_read_pc (regcache);
+
+ infrun_debug_printf ("saved stop_pc=%s for %s "
+ "(currently_stepping=%d)",
+ paddress (target_gdbarch (),
+ t->suspend.stop_pc),
+ target_pid_to_str (t->ptid).c_str (),
+ currently_stepping (t));
+ }
+ }
+
+ return false;
+}
+
/* See infrun.h. */
void
target_thread_events (false);
}
- /* Use infrun_debug_printf_1 directly to get a meaningful function
- name. */
+ /* Use debug_prefixed_printf directly to get a meaningful function
+ name. */
if (debug_infrun)
- infrun_debug_printf_1 ("stop_all_threads", "done");
+ debug_prefixed_printf ("infrun", "stop_all_threads", "done");
};
/* Request threads to stop, and then wait for the stops. Because
for (int i = 0; i < waits_needed; i++)
{
wait_one_event event = wait_one ();
-
- infrun_debug_printf
- ("%s %s", target_waitstatus_to_string (&event.ws).c_str (),
- target_pid_to_str (event.ptid).c_str ());
-
- if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED)
- {
- /* All resumed threads exited. */
- break;
- }
- else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED
- || event.ws.kind == TARGET_WAITKIND_EXITED
- || event.ws.kind == TARGET_WAITKIND_SIGNALLED)
- {
- /* One thread/process exited/signalled. */
-
- 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 ())
- {
- int pid = event.ptid.pid ();
- inferior *inf = find_inferior_pid (event.target, pid);
- for (thread_info *tp : inf->non_exited_threads ())
- {
- t = tp;
- break;
- }
-
- /* 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_debug_printf
- ("using %s", 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
- {
- 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)
- {
- switch_to_thread_no_regs (t);
- setup_inferior (0);
- }
-
- 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;
-
- if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0)
- {
- /* Add it back to the step-over queue. */
- infrun_debug_printf
- ("displaced-step of %s canceled: adding back to "
- "the step-over queue",
- target_pid_to_str (t->ptid).c_str ());
-
- t->control.trap_expected = 0;
- thread_step_over_chain_enqueue (t);
- }
- }
- else
- {
- enum gdb_signal sig;
- struct regcache *regcache;
-
- infrun_debug_printf
- ("target_wait %s, saving status for %d.%ld.%ld",
- target_waitstatus_to_string (&event.ws).c_str (),
- t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ());
-
- /* Record for later. */
- save_waitstatus (t, &event.ws);
-
- sig = (event.ws.kind == TARGET_WAITKIND_STOPPED
- ? event.ws.value.sig : GDB_SIGNAL_0);
-
- 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);
- }
-
- regcache = get_thread_regcache (t);
- t->suspend.stop_pc = regcache_read_pc (regcache);
-
- infrun_debug_printf ("saved stop_pc=%s for %s "
- "(currently_stepping=%d)",
- paddress (target_gdbarch (),
- t->suspend.stop_pc),
- target_pid_to_str (t->ptid).c_str (),
- currently_stepping (t));
- }
- }
+ if (handle_one (event))
+ break;
}
}
}
#0 - thread 1 is left stopped
#1 - thread 2 is resumed and hits breakpoint
- -> TARGET_WAITKIND_STOPPED
+ -> TARGET_WAITKIND_STOPPED
#2 - thread 3 is resumed and exits
- this is the last resumed thread, so
+ this is the last resumed thread, so
-> TARGET_WAITKIND_NO_RESUMED
#3 - gdb processes stop for thread 2 and decides to re-resume
- it.
+ it.
#4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event.
- thread 2 is now resumed, so the event should be ignored.
+ thread 2 is now resumed, so the event should be ignored.
IOW, if the stop for thread 2 doesn't end a foreground command,
then we need to ignore the following TARGET_WAITKIND_NO_RESUMED
end. */
scoped_value_mark free_values;
- enum stop_kind stop_soon;
-
infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ());
if (ecs->ws.kind == TARGET_WAITKIND_IGNORE)
switch (ecs->ws.kind)
{
case TARGET_WAITKIND_LOADED:
- context_switch (ecs);
- /* Ignore gracefully during startup of the inferior, as it might
- be the shell which has just loaded some objects, otherwise
- add the symbols for the newly loaded objects. Also ignore at
- the beginning of an attach or remote session; we will query
- the full list of libraries once the connection is
- established. */
-
- stop_soon = get_inferior_stop_soon (ecs);
- if (stop_soon == NO_STOP_QUIETLY)
- {
- struct regcache *regcache;
-
- regcache = get_thread_regcache (ecs->event_thread);
+ {
+ context_switch (ecs);
+ /* Ignore gracefully during startup of the inferior, as it might
+ be the shell which has just loaded some objects, otherwise
+ add the symbols for the newly loaded objects. Also ignore at
+ the beginning of an attach or remote session; we will query
+ the full list of libraries once the connection is
+ established. */
+
+ stop_kind stop_soon = get_inferior_stop_soon (ecs);
+ if (stop_soon == NO_STOP_QUIETLY)
+ {
+ struct regcache *regcache;
- handle_solib_event ();
+ regcache = get_thread_regcache (ecs->event_thread);
- ecs->event_thread->control.stop_bpstat
- = bpstat_stop_status (regcache->aspace (),
- ecs->event_thread->suspend.stop_pc,
- ecs->event_thread, &ecs->ws);
+ handle_solib_event ();
- if (handle_stop_requested (ecs))
- return;
+ ecs->event_thread->control.stop_bpstat
+ = bpstat_stop_status (regcache->aspace (),
+ ecs->event_thread->suspend.stop_pc,
+ ecs->event_thread, &ecs->ws);
- if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
- {
- /* A catchpoint triggered. */
- process_event_stop_test (ecs);
+ if (handle_stop_requested (ecs))
return;
- }
- /* If requested, stop when the dynamic linker notifies
- gdb of events. This allows the user to get control
- and place breakpoints in initializer routines for
- dynamically loaded objects (among other things). */
- ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
- if (stop_on_solib_events)
- {
- /* Make sure we print "Stopped due to solib-event" in
- normal_stop. */
- stop_print_frame = true;
+ if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
+ {
+ /* A catchpoint triggered. */
+ process_event_stop_test (ecs);
+ return;
+ }
- stop_waiting (ecs);
- return;
- }
- }
+ /* If requested, stop when the dynamic linker notifies
+ gdb of events. This allows the user to get control
+ and place breakpoints in initializer routines for
+ dynamically loaded objects (among other things). */
+ ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
+ if (stop_on_solib_events)
+ {
+ /* Make sure we print "Stopped due to solib-event" in
+ normal_stop. */
+ stop_print_frame = true;
- /* If we are skipping through a shell, or through shared library
- loading that we aren't interested in, resume the program. If
- we're running the program normally, also resume. */
- if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
- {
- /* Loading of shared libraries might have changed breakpoint
- addresses. Make sure new breakpoints are inserted. */
- if (stop_soon == NO_STOP_QUIETLY)
- insert_breakpoints ();
- resume (GDB_SIGNAL_0);
- prepare_to_wait (ecs);
- return;
- }
+ stop_waiting (ecs);
+ return;
+ }
+ }
- /* But stop if we're attaching or setting up a remote
- connection. */
- if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
- || stop_soon == STOP_QUIETLY_REMOTE)
- {
- infrun_debug_printf ("quietly stopped");
- stop_waiting (ecs);
- return;
- }
+ /* If we are skipping through a shell, or through shared library
+ loading that we aren't interested in, resume the program. If
+ we're running the program normally, also resume. */
+ if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
+ {
+ /* Loading of shared libraries might have changed breakpoint
+ addresses. Make sure new breakpoints are inserted. */
+ if (stop_soon == NO_STOP_QUIETLY)
+ insert_breakpoints ();
+ resume (GDB_SIGNAL_0);
+ prepare_to_wait (ecs);
+ return;
+ }
- internal_error (__FILE__, __LINE__,
- _("unhandled stop_soon: %d"), (int) stop_soon);
+ /* But stop if we're attaching or setting up a remote
+ connection. */
+ if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
+ || stop_soon == STOP_QUIETLY_REMOTE)
+ {
+ infrun_debug_printf ("quietly stopped");
+ stop_waiting (ecs);
+ return;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("unhandled stop_soon: %d"), (int) stop_soon);
+ }
case TARGET_WAITKIND_SPURIOUS:
if (handle_stop_requested (ecs))
{
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
struct gdbarch *gdbarch = regcache->arch ();
+ inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid);
- /* If checking displaced stepping is supported, and thread
- ecs->ptid is displaced stepping. */
+ /* If this is a fork (child gets its own address space copy) and some
+ displaced step buffers were in use at the time of the fork, restore
+ the displaced step buffer bytes in the child process. */
+ if (ecs->ws.kind == TARGET_WAITKIND_FORKED)
+ gdbarch_displaced_step_restore_all_in_ptid
+ (gdbarch, parent_inf, ecs->ws.value.related_pid);
+
+ /* If displaced stepping is supported, and thread ecs->ptid is
+ displaced stepping. */
if (displaced_step_in_progress_thread (ecs->event_thread))
{
- struct inferior *parent_inf
- = 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);
- }
-
/* 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 ();
/* Read PC value of parent process. */
parent_pc = regcache_read_pc (regcache);
- if (debug_displaced)
- fprintf_unfiltered (gdb_stdlog,
- "displaced: write child pc from %s to %s\n",
- paddress (gdbarch,
- regcache_read_pc (child_regcache)),
- paddress (gdbarch, parent_pc));
+ displaced_debug_printf ("write child pc from %s to %s",
+ paddress (gdbarch,
+ regcache_read_pc (child_regcache)),
+ paddress (gdbarch, parent_pc));
regcache_write_pc (child_regcache, parent_pc);
}
handle_vfork_child_exec_or_exit (1);
/* This causes the eventpoints and symbol table to be reset.
- Must do this now, before trying to determine whether to
- stop. */
+ Must do this now, before trying to determine whether to
+ stop. */
follow_exec (inferior_ptid, ecs->ws.value.execd_pathname);
/* In follow_exec we may have deleted the original thread and
return;
/* Be careful not to try to gather much state about a thread
- that's in a syscall. It's frequently a losing proposition. */
+ that's in a syscall. It's frequently a losing proposition. */
case TARGET_WAITKIND_SYSCALL_ENTRY:
/* Getting the current syscall number. */
if (handle_syscall_event (ecs) == 0)
return;
/* Before examining the threads further, step this thread to
- get it entirely out of the syscall. (We get notice of the
- event when the thread is just on the verge of exiting a
- syscall. Stepping one instruction seems to get it back
- into user code.) */
+ get it entirely out of the syscall. (We get notice of the
+ event when the thread is just on the verge of exiting a
+ syscall. Stepping one instruction seems to get it back
+ into user code.) */
case TARGET_WAITKIND_SYSCALL_RETURN:
if (handle_syscall_event (ecs) == 0)
process_event_stop_test (ecs);
for (thread_info *tp : all_non_exited_threads ())
{
+ if (tp->inf->detaching)
+ {
+ infrun_debug_printf ("restart threads: [%s] inferior detaching",
+ target_pid_to_str (tp->ptid).c_str ());
+ continue;
+ }
+
switch_to_thread_no_regs (tp);
if (tp == event_thread)
static int
finish_step_over (struct execution_control_state *ecs)
{
- displaced_step_fixup (ecs->event_thread,
- ecs->event_thread->suspend.stop_signal);
+ displaced_step_finish (ecs->event_thread,
+ ecs->event_thread->suspend.stop_signal);
bool had_step_over_info = step_over_info_valid_p ();
infrun_debug_printf ("saved stop_pc=%s for %s "
"(currently_stepping=%d)",
paddress (target_gdbarch (),
- tp->suspend.stop_pc),
+ tp->suspend.stop_pc),
target_pid_to_str (tp->ptid).c_str (),
currently_stepping (tp));
ecs->event_thread->suspend.stop_pc
= regcache_read_pc (get_thread_regcache (ecs->event_thread));
+ context_switch (ecs);
+
+ if (deprecated_context_hook)
+ deprecated_context_hook (ecs->event_thread->global_num);
+
if (debug_infrun)
{
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
struct gdbarch *reg_gdbarch = regcache->arch ();
- switch_to_thread (ecs->event_thread);
-
infrun_debug_printf ("stop_pc=%s",
paddress (reg_gdbarch,
ecs->event_thread->suspend.stop_pc));
if (target_stopped_by_watchpoint ())
{
- CORE_ADDR addr;
+ CORE_ADDR addr;
infrun_debug_printf ("stopped by watchpoint");
if (target_stopped_data_address (current_top_target (), &addr))
infrun_debug_printf ("stopped data address=%s",
- paddress (reg_gdbarch, addr));
- else
+ paddress (reg_gdbarch, addr));
+ else
infrun_debug_printf ("(no data address available)");
}
}
stop_soon = get_inferior_stop_soon (ecs);
if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
{
- context_switch (ecs);
infrun_debug_printf ("quietly stopped");
stop_print_frame = true;
stop_waiting (ecs);
return;
}
- /* See if something interesting happened to the non-current thread. If
- so, then switch to that thread. */
- if (ecs->ptid != inferior_ptid)
- {
- infrun_debug_printf ("context switch");
-
- context_switch (ecs);
-
- if (deprecated_context_hook)
- deprecated_context_hook (ecs->event_thread->global_num);
- }
-
/* At this point, get hold of the now-current thread's frame. */
frame = get_current_frame ();
gdbarch = get_frame_arch (frame);
|| gdbarch_have_nonsteppable_watchpoint (gdbarch)))
{
/* At this point, we are stopped at an instruction which has
- attempted to write to a piece of memory under control of
- a watchpoint. The instruction hasn't actually executed
- yet. If we were to evaluate the watchpoint expression
- now, we would get the old value, and therefore no change
- would seem to have occurred.
-
- In order to make watchpoints work `right', we really need
- to complete the memory write, and then evaluate the
- watchpoint expression. We do this by single-stepping the
+ attempted to write to a piece of memory under control of
+ a watchpoint. The instruction hasn't actually executed
+ yet. If we were to evaluate the watchpoint expression
+ now, we would get the old value, and therefore no change
+ would seem to have occurred.
+
+ In order to make watchpoints work `right', we really need
+ to complete the memory write, and then evaluate the
+ watchpoint expression. We do this by single-stepping the
target.
It may not be necessary to disable the watchpoint to step over
{
/* The user issued a continue when stopped at a breakpoint.
Set up for another trap and get out of here. */
- ecs->event_thread->stepping_over_breakpoint = 1;
- keep_going (ecs);
- return;
+ ecs->event_thread->stepping_over_breakpoint = 1;
+ keep_going (ecs);
+ return;
}
else if (step_through_delay)
{
if (random_signal)
{
/* Signal not for debugging purposes. */
- struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal;
infrun_debug_printf ("random signal (%s)",
to remain stopped. */
if (stop_soon != NO_STOP_QUIETLY
|| ecs->event_thread->stop_requested
- || (!inf->detaching
- && signal_stop_state (ecs->event_thread->suspend.stop_signal)))
+ || signal_stop_state (ecs->event_thread->suspend.stop_signal))
{
stop_waiting (ecs);
return;
infrun_debug_printf ("step-resume breakpoint is inserted");
/* Having a step-resume breakpoint overrides anything
- else having to do with stepping commands until
- that breakpoint is reached. */
+ else having to do with stepping commands until
+ that breakpoint is reached. */
keep_going (ecs);
return;
}
{
infrun_debug_printf ("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
- inferior leaves the trampoline (either by calling the handler
- or returning). */
+ a signal trampoline (either by a signal being delivered or by
+ the signal handler returning). Just single-step until the
+ inferior leaves the trampoline (either by calling the handler
+ or returning). */
keep_going (ecs);
return;
}
}
/* If we are in a function call trampoline (a stub between the
- calling routine and the real function), locate the real
- function. That's what tells us (a) whether we want to step
- into it at all, and (b) what prologue we want to run to the
- end of, if we do step into it. */
+ calling routine and the real function), locate the real
+ function. That's what tells us (a) whether we want to step
+ into it at all, and (b) what prologue we want to run to the
+ end of, if we do step into it. */
real_stop_pc = skip_language_trampoline (frame, stop_pc);
if (real_stop_pc == 0)
real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
thinking of stepping into and the function isn't on the skip
list, step into it.
- If there are several symtabs at that PC (e.g. with include
- files), just want to know whether *any* of them have line
- numbers. find_pc_line handles this. */
+ If there are several symtabs at that PC (e.g. with include
+ files), just want to know whether *any* of them have line
+ numbers. find_pc_line handles this. */
{
struct symtab_and_line tmp_sal;
}
/* If we have no line number and the step-stop-if-no-debug is
- set, we stop the step so that the user has a chance to switch
- in assembly mode. */
+ set, we stop the step so that the user has a chance to switch
+ in assembly mode. */
if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
&& step_stop_if_no_debug)
{
infrun_debug_printf ("stepped into undebuggable function");
/* The inferior just stepped into, or returned to, an
- undebuggable function (where there is no debugging information
- and no line number corresponding to the address where the
- inferior stopped). Since we want to skip this kind of code,
- we keep going until the inferior returns from this
- function - unless the user has asked us not to (via
- set step-mode) or we no longer know how to get back
- to the call site. */
+ undebuggable function (where there is no debugging information
+ and no line number corresponding to the address where the
+ inferior stopped). Since we want to skip this kind of code,
+ we keep going until the inferior returns from this
+ function - unless the user has asked us not to (via
+ set step-mode) or we no longer know how to get back
+ to the call site. */
if (step_stop_if_no_debug
|| !frame_id_p (frame_unwind_caller_id (frame)))
{
if (ecs->event_thread->control.step_range_end == 1)
{
/* It is stepi or nexti. We always want to stop stepping after
- one instruction. */
+ one instruction. */
infrun_debug_printf ("stepi/nexti");
end_stepping_range (ecs);
return;
if (stop_pc_sal.line == 0)
{
/* We have no line number information. That means to stop
- 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?). */
+ 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?). */
infrun_debug_printf ("line number info");
end_stepping_range (ecs);
return;
&& (ecs->event_thread->current_line != stop_pc_sal.line
|| ecs->event_thread->current_symtab != stop_pc_sal.symtab))
{
+ /* We are at a different line. */
+
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. */
+ /* We are at the start of a statement.
+
+ So stop. Note that we don't stop if we step into the middle of a
+ statement. That is said to make things like for (;;) statements
+ work better. */
infrun_debug_printf ("stepped to a different line");
end_stepping_range (ecs);
return;
}
else if (frame_id_eq (get_frame_id (get_current_frame ()),
- ecs->event_thread->control.step_frame_id))
+ 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,
+ /* We are not at the start of 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_debug_printf ("stepped to a different line, but "
"it's not the start of a statement");
}
+ else
+ {
+ /* We are not the start of a statement, and we have changed frame.
+
+ We ignore this line table entry, and continue stepping forward,
+ looking for a better place to stop. Keep refresh_step_info at
+ true to note that the frame has changed, but ignore the line
+ number to make sure we don't ignore a subsequent entry with the
+ same line number. */
+ stop_pc_sal.line = 0;
+ infrun_debug_printf ("stepped to a different frame, but "
+ "it's not the start of a statement");
+ }
}
/* We aren't done stepping.
keep_going (ecs);
}
+static bool restart_stepped_thread (process_stratum_target *resume_target,
+ ptid_t resume_ptid);
+
/* In all-stop mode, if we're currently stepping but have stopped in
some other thread, we may need to switch back to the stepped
thread. Returns true we set the inferior running, false if we left
{
if (!target_is_non_stop_p ())
{
- struct thread_info *stepping_thread;
-
/* If any thread is blocked on some internal breakpoint, and we
simply need to step over that breakpoint to get it going
again, do that first. */
if (!signal_program[ecs->event_thread->suspend.stop_signal])
ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0;
- /* Do all pending step-overs before actually proceeding with
- step/next/etc. */
- if (start_step_over ())
+ if (restart_stepped_thread (ecs->target, ecs->ptid))
{
prepare_to_wait (ecs);
return true;
}
- /* Look for the stepping/nexting thread. */
- stepping_thread = NULL;
+ switch_to_thread (ecs->event_thread);
+ }
- for (thread_info *tp : all_non_exited_threads ())
- {
- switch_to_thread_no_regs (tp);
+ return false;
+}
- /* Ignore threads of processes the caller is not
- resuming. */
- if (!sched_multi
- && (tp->inf->process_target () != ecs->target
- || tp->inf->pid != ecs->ptid.pid ()))
- continue;
+/* Look for the thread that was stepping, and resume it.
+ RESUME_TARGET / RESUME_PTID indicate the set of threads the caller
+ is resuming. Return true if a thread was started, false
+ otherwise. */
- /* When stepping over a breakpoint, we lock all threads
- except the one that needs to move past the breakpoint.
- If a non-event thread has this set, the "incomplete
- step-over" check above should have caught it earlier. */
- if (tp->control.trap_expected)
- {
- internal_error (__FILE__, __LINE__,
- "[%s] has inconsistent state: "
- "trap_expected=%d\n",
- target_pid_to_str (tp->ptid).c_str (),
- tp->control.trap_expected);
- }
+static bool
+restart_stepped_thread (process_stratum_target *resume_target,
+ ptid_t resume_ptid)
+{
+ /* Do all pending step-overs before actually proceeding with
+ step/next/etc. */
+ if (start_step_over ())
+ return true;
- /* Did we find the stepping thread? */
- if (tp->control.step_range_end)
- {
- /* Yep. There should only one though. */
- gdb_assert (stepping_thread == NULL);
+ for (thread_info *tp : all_threads_safe ())
+ {
+ if (tp->state == THREAD_EXITED)
+ continue;
+
+ if (tp->suspend.waitstatus_pending_p)
+ continue;
- /* The event thread is handled at the top, before we
- enter this loop. */
- gdb_assert (tp != ecs->event_thread);
+ /* Ignore threads of processes the caller is not
+ resuming. */
+ if (!sched_multi
+ && (tp->inf->process_target () != resume_target
+ || tp->inf->pid != resume_ptid.pid ()))
+ continue;
- /* If some thread other than the event thread is
- stepping, then scheduler locking can't be in effect,
- otherwise we wouldn't have resumed the current event
- thread in the first place. */
- gdb_assert (!schedlock_applies (tp));
+ if (tp->control.trap_expected)
+ {
+ infrun_debug_printf ("switching back to stepped thread (step-over)");
- stepping_thread = tp;
- }
+ if (keep_going_stepped_thread (tp))
+ return true;
}
+ }
+
+ for (thread_info *tp : all_threads_safe ())
+ {
+ if (tp->state == THREAD_EXITED)
+ continue;
+
+ if (tp->suspend.waitstatus_pending_p)
+ continue;
+
+ /* Ignore threads of processes the caller is not
+ resuming. */
+ if (!sched_multi
+ && (tp->inf->process_target () != resume_target
+ || tp->inf->pid != resume_ptid.pid ()))
+ continue;
- if (stepping_thread != NULL)
+ /* Did we find the stepping thread? */
+ if (tp->control.step_range_end)
{
- infrun_debug_printf ("switching back to stepped thread");
+ infrun_debug_printf ("switching back to stepped thread (stepping)");
- if (keep_going_stepped_thread (stepping_thread))
- {
- prepare_to_wait (ecs);
- return true;
- }
+ if (keep_going_stepped_thread (tp))
+ return true;
}
-
- switch_to_thread (ecs->event_thread);
}
return false;
}
+/* See infrun.h. */
+
+void
+restart_after_all_stop_detach (process_stratum_target *proc_target)
+{
+ /* Note we don't check target_is_non_stop_p() here, because the
+ current inferior may no longer have a process_stratum target
+ pushed, as we just detached. */
+
+ /* See if we have a THREAD_RUNNING thread that need to be
+ re-resumed. If we have any thread that is already executing,
+ then we don't need to resume the target -- it is already been
+ resumed. With the remote target (in all-stop), it's even
+ impossible to issue another resumption if the target is already
+ resumed, until the target reports a stop. */
+ for (thread_info *thr : all_threads (proc_target))
+ {
+ if (thr->state != THREAD_RUNNING)
+ continue;
+
+ /* If we have any thread that is already executing, then we
+ don't need to resume the target -- it is already been
+ resumed. */
+ if (thr->executing)
+ return;
+
+ /* If we have a pending event to process, skip resuming the
+ target and go straight to processing it. */
+ if (thr->resumed && thr->suspend.waitstatus_pending_p)
+ return;
+ }
+
+ /* Alright, we need to re-resume the target. If a thread was
+ stepping, we need to restart it stepping. */
+ if (restart_stepped_thread (proc_target, minus_one_ptid))
+ return;
+
+ /* Otherwise, find the first THREAD_RUNNING thread and resume
+ it. */
+ for (thread_info *thr : all_threads (proc_target))
+ {
+ if (thr->state != THREAD_RUNNING)
+ continue;
+
+ execution_control_state ecs;
+ reset_ecs (&ecs, thr);
+ switch_to_thread (thr);
+ keep_going (&ecs);
+ return;
+ }
+}
+
/* Set a previously stepped thread back to stepping. Returns true on
success, false if the resume is not possible (e.g., the thread
vanished). */
sr_sal.pspace = get_frame_program_space (get_current_frame ());
/* Do not specify what the fp should be when we stop since on
- some machines the prologue is where the new fp value is
- established. */
+ some machines the prologue is where the new fp value is
+ established. */
insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id);
/* And make sure stepping stops right away then. */
ecs->event_thread->control.step_range_end
- = ecs->event_thread->control.step_range_start;
+ = ecs->event_thread->control.step_range_start;
}
keep_going (ecs);
}
infrun_debug_printf ("step-over already in progress: "
"step-over for %s deferred",
target_pid_to_str (tp->ptid).c_str ());
- thread_step_over_chain_enqueue (tp);
+ global_thread_step_over_chain_enqueue (tp);
}
else
{
struct stop_context
{
stop_context ();
- ~stop_context ();
DISABLE_COPY_AND_ASSIGN (stop_context);
/* If stopp for a thread event, this is the thread that caused the
stop. */
- struct thread_info *thread;
+ thread_info_ref thread;
/* The inferior that caused the stop. */
int inf_num;
{
/* Take a strong reference so that the thread can't be deleted
yet. */
- thread = inferior_thread ();
- thread->incref ();
+ thread = thread_info_ref::new_reference (inferior_thread ());
}
- else
- thread = NULL;
-}
-
-/* Release a stop context previously created with save_stop_context.
- Releases the strong reference to the thread as well. */
-
-stop_context::~stop_context ()
-{
- if (thread != NULL)
- thread->decref ();
}
/* Return true if the current context no longer matches the saved stop
print the stop event. */
if (inferior_ptid != null_ptid)
gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat,
- stop_print_frame);
+ stop_print_frame);
else
gdb::observers::normal_stop.notify (NULL, stop_print_frame);
}
/* If any signal numbers or symbol names were found, set flags for
- which signals to apply actions to. */
+ which signals to apply actions to. */
for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
{
/* Capture state from GDBARCH, TP, and REGCACHE that must be restored
once the inferior function call has finished. */
infcall_suspend_state (struct gdbarch *gdbarch,
- const struct thread_info *tp,
- struct regcache *regcache)
+ const struct thread_info *tp,
+ struct regcache *regcache)
: m_thread_suspend (tp->suspend),
m_registers (new readonly_detached_regcache (*regcache))
{
if (gdbarch_get_siginfo_type_p (gdbarch))
{
- struct type *type = gdbarch_get_siginfo_type (gdbarch);
- size_t len = TYPE_LENGTH (type);
+ struct type *type = gdbarch_get_siginfo_type (gdbarch);
+ size_t len = TYPE_LENGTH (type);
- siginfo_data.reset ((gdb_byte *) xmalloc (len));
+ siginfo_data.reset ((gdb_byte *) xmalloc (len));
- if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL,
- siginfo_data.get (), 0, len) != len)
- {
- /* Errors ignored. */
- siginfo_data.reset (nullptr);
- }
+ if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL,
+ siginfo_data.get (), 0, len) != len)
+ {
+ /* Errors ignored. */
+ siginfo_data.reset (nullptr);
+ }
}
if (siginfo_data)
{
- m_siginfo_gdbarch = gdbarch;
- m_siginfo_data = std::move (siginfo_data);
+ m_siginfo_gdbarch = gdbarch;
+ m_siginfo_data = std::move (siginfo_data);
}
}
/* Restores the stored state into GDBARCH, TP, and REGCACHE. */
void restore (struct gdbarch *gdbarch,
- struct thread_info *tp,
- struct regcache *regcache) const
+ struct thread_info *tp,
+ struct regcache *regcache) const
{
tp->suspend = m_thread_suspend;
if (m_siginfo_gdbarch == gdbarch)
{
- struct type *type = gdbarch_get_siginfo_type (gdbarch);
+ struct type *type = gdbarch_get_siginfo_type (gdbarch);
- /* Errors ignored. */
- target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL,
- m_siginfo_data.get (), 0, TYPE_LENGTH (type));
+ /* Errors ignored. */
+ target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL,
+ m_siginfo_data.get (), 0, TYPE_LENGTH (type));
}
/* The inferior can be gone if the user types "print exit(0)"
enum stop_stack_kind stop_stack_dummy = STOP_NONE;
int stopped_by_random_signal = 0;
- /* ID if the selected frame when the inferior function call was made. */
+ /* ID and level of the selected frame when the inferior function
+ call was made. */
struct frame_id selected_frame_id {};
+ int selected_frame_level = -1;
};
/* Save all of the information associated with the inferior<==>gdb
inf_status->stop_stack_dummy = stop_stack_dummy;
inf_status->stopped_by_random_signal = stopped_by_random_signal;
- inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
+ save_selected_frame (&inf_status->selected_frame_id,
+ &inf_status->selected_frame_level);
return inf_status;
}
-static void
-restore_selected_frame (const frame_id &fid)
-{
- frame_info *frame = frame_find_by_id (fid);
-
- /* If inf_status->selected_frame_id is NULL, there was no previously
- selected frame. */
- if (frame == NULL)
- {
- warning (_("Unable to restore previously selected frame."));
- return;
- }
-
- select_frame (frame);
-}
-
/* Restore inferior session state to INF_STATUS. */
void
if (target_has_stack ())
{
- /* The point of the try/catch is that if the stack is clobbered,
- walking the stack might encounter a garbage pointer and
- error() trying to dereference it. */
- try
- {
- restore_selected_frame (inf_status->selected_frame_id);
- }
- catch (const gdb_exception_error &ex)
- {
- exception_fprintf (gdb_stderr, ex,
- "Unable to restore previously selected frame:\n");
- /* Error in restoring the selected frame. Select the
- innermost frame. */
- select_frame (get_current_frame ());
- }
+ restore_selected_frame (inf_status->selected_frame_id,
+ inf_status->selected_frame_level);
}
delete inf_status;
static void
infrun_async_inferior_event_handler (gdb_client_data data)
{
+ clear_async_event_handler (infrun_async_inferior_event_token);
inferior_event_handler (INF_REG_EVENT);
}
This allows you to set a list of commands to be run each time execution\n\
of the program stops."), &cmdlist);
- add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\
-Set inferior debugging."), _("\
-Show inferior debugging."), _("\
-When non-zero, inferior specific debugging is enabled."),
- NULL,
- show_debug_infrun,
- &setdebuglist, &showdebuglist);
-
- add_setshow_boolean_cmd ("displaced", class_maintenance,
- &debug_displaced, _("\
-Set displaced stepping debugging."), _("\
-Show displaced stepping debugging."), _("\
-When non-zero, displaced stepping specific debugging is enabled."),
- NULL,
- show_debug_displaced,
- &setdebuglist, &showdebuglist);
+ add_setshow_boolean_cmd
+ ("infrun", class_maintenance, &debug_infrun,
+ _("Set inferior debugging."),
+ _("Show inferior debugging."),
+ _("When non-zero, inferior specific debugging is enabled."),
+ NULL, show_debug_infrun, &setdebuglist, &showdebuglist);
add_setshow_boolean_cmd ("non-stop", no_class,
&non_stop_1, _("\
Show mode for locking scheduler during execution."), _("\
off == no locking (threads may preempt at any time)\n\
on == full locking (no thread except the current thread may run)\n\
- This applies to both normal execution and replay mode.\n\
+ This applies to both normal execution and replay mode.\n\
step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\
- In this mode, other threads may run during other commands.\n\
- This applies to both normal execution and replay mode.\n\
+ In this mode, other threads may run during other commands.\n\
+ This applies to both normal execution and replay mode.\n\
replay == scheduler locked in replay mode and unlocked during normal execution."),
set_schedlock_func, /* traps on target vector */
show_scheduler_mode,
gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested);
gdb::observers::thread_exit.attach (infrun_thread_thread_exit);
gdb::observers::inferior_exit.attach (infrun_inferior_exit);
+ gdb::observers::inferior_execd.attach (infrun_inferior_execd);
/* Explicitly create without lookup, since that tries to create a
value with a void typed value, and when we get here, gdbarch
projects / binutils.git / blobdiff