mirror of
https://sourceware.org/git/binutils-gdb.git
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6cb06a8cda
Now that filtered and unfiltered output can be treated identically, we can unify the printf family of functions. This is done under the name "gdb_printf". Most of this patch was written by script.
447 lines
12 KiB
C
447 lines
12 KiB
C
/* Everything about signal catchpoints, for GDB.
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Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include <ctype.h>
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#include "breakpoint.h"
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#include "gdbcmd.h"
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#include "inferior.h"
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#include "infrun.h"
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#include "annotate.h"
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#include "valprint.h"
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#include "cli/cli-utils.h"
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#include "completer.h"
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#include "cli/cli-style.h"
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#include "cli/cli-decode.h"
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#include <string>
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#define INTERNAL_SIGNAL(x) ((x) == GDB_SIGNAL_TRAP || (x) == GDB_SIGNAL_INT)
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/* An instance of this type is used to represent a signal catchpoint.
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A breakpoint is really of this type iff its ops pointer points to
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SIGNAL_CATCHPOINT_OPS. */
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struct signal_catchpoint : public breakpoint
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{
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/* Signal numbers used for the 'catch signal' feature. If no signal
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has been specified for filtering, it is empty. Otherwise,
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it holds a list of all signals to be caught. */
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std::vector<gdb_signal> signals_to_be_caught;
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/* If SIGNALS_TO_BE_CAUGHT is empty, then all "ordinary" signals are
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caught. If CATCH_ALL is true, then internal signals are caught
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as well. If SIGNALS_TO_BE_CAUGHT is not empty, then this field
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is ignored. */
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bool catch_all;
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};
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/* The breakpoint_ops structure to be used in signal catchpoints. */
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static struct breakpoint_ops signal_catchpoint_ops;
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/* Count of each signal. */
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static unsigned int signal_catch_counts[GDB_SIGNAL_LAST];
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/* A convenience wrapper for gdb_signal_to_name that returns the
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integer value if the name is not known. */
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static const char *
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signal_to_name_or_int (enum gdb_signal sig)
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{
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const char *result = gdb_signal_to_name (sig);
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if (strcmp (result, "?") == 0)
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result = plongest (sig);
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return result;
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}
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/* Implement the "insert_location" breakpoint_ops method for signal
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catchpoints. */
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static int
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signal_catchpoint_insert_location (struct bp_location *bl)
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{
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struct signal_catchpoint *c = (struct signal_catchpoint *) bl->owner;
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if (!c->signals_to_be_caught.empty ())
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{
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for (gdb_signal iter : c->signals_to_be_caught)
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++signal_catch_counts[iter];
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}
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else
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{
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for (int i = 0; i < GDB_SIGNAL_LAST; ++i)
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{
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if (c->catch_all || !INTERNAL_SIGNAL (i))
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++signal_catch_counts[i];
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}
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}
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signal_catch_update (signal_catch_counts);
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return 0;
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}
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/* Implement the "remove_location" breakpoint_ops method for signal
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catchpoints. */
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static int
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signal_catchpoint_remove_location (struct bp_location *bl,
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enum remove_bp_reason reason)
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{
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struct signal_catchpoint *c = (struct signal_catchpoint *) bl->owner;
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if (!c->signals_to_be_caught.empty ())
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{
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for (gdb_signal iter : c->signals_to_be_caught)
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{
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gdb_assert (signal_catch_counts[iter] > 0);
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--signal_catch_counts[iter];
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}
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}
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else
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{
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for (int i = 0; i < GDB_SIGNAL_LAST; ++i)
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{
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if (c->catch_all || !INTERNAL_SIGNAL (i))
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{
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gdb_assert (signal_catch_counts[i] > 0);
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--signal_catch_counts[i];
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}
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}
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}
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signal_catch_update (signal_catch_counts);
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return 0;
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}
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/* Implement the "breakpoint_hit" breakpoint_ops method for signal
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catchpoints. */
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static int
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signal_catchpoint_breakpoint_hit (const struct bp_location *bl,
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const address_space *aspace,
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CORE_ADDR bp_addr,
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const target_waitstatus &ws)
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{
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const struct signal_catchpoint *c
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= (const struct signal_catchpoint *) bl->owner;
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gdb_signal signal_number;
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if (ws.kind () != TARGET_WAITKIND_STOPPED)
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return 0;
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signal_number = ws.sig ();
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/* If we are catching specific signals in this breakpoint, then we
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must guarantee that the called signal is the same signal we are
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catching. */
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if (!c->signals_to_be_caught.empty ())
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{
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for (gdb_signal iter : c->signals_to_be_caught)
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if (signal_number == iter)
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return 1;
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/* Not the same. */
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return 0;
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}
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else
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return c->catch_all || !INTERNAL_SIGNAL (signal_number);
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}
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/* Implement the "print_it" breakpoint_ops method for signal
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catchpoints. */
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static enum print_stop_action
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signal_catchpoint_print_it (bpstat *bs)
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{
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struct breakpoint *b = bs->breakpoint_at;
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struct target_waitstatus last;
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const char *signal_name;
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struct ui_out *uiout = current_uiout;
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get_last_target_status (nullptr, nullptr, &last);
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signal_name = signal_to_name_or_int (last.sig ());
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annotate_catchpoint (b->number);
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maybe_print_thread_hit_breakpoint (uiout);
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gdb_printf (_("Catchpoint %d (signal %s), "), b->number, signal_name);
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return PRINT_SRC_AND_LOC;
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}
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/* Implement the "print_one" breakpoint_ops method for signal
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catchpoints. */
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static void
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signal_catchpoint_print_one (struct breakpoint *b,
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struct bp_location **last_loc)
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{
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struct signal_catchpoint *c = (struct signal_catchpoint *) b;
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struct value_print_options opts;
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struct ui_out *uiout = current_uiout;
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get_user_print_options (&opts);
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/* Field 4, the address, is omitted (which makes the columns
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not line up too nicely with the headers, but the effect
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is relatively readable). */
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if (opts.addressprint)
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uiout->field_skip ("addr");
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annotate_field (5);
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if (c->signals_to_be_caught.size () > 1)
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uiout->text ("signals \"");
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else
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uiout->text ("signal \"");
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if (!c->signals_to_be_caught.empty ())
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{
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std::string text;
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bool first = true;
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for (gdb_signal iter : c->signals_to_be_caught)
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{
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const char *name = signal_to_name_or_int (iter);
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if (!first)
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text += " ";
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first = false;
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text += name;
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}
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uiout->field_string ("what", text);
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}
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else
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uiout->field_string ("what",
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c->catch_all ? "<any signal>" : "<standard signals>",
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metadata_style.style ());
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uiout->text ("\" ");
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if (uiout->is_mi_like_p ())
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uiout->field_string ("catch-type", "signal");
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}
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/* Implement the "print_mention" breakpoint_ops method for signal
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catchpoints. */
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static void
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signal_catchpoint_print_mention (struct breakpoint *b)
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{
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struct signal_catchpoint *c = (struct signal_catchpoint *) b;
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if (!c->signals_to_be_caught.empty ())
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{
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if (c->signals_to_be_caught.size () > 1)
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gdb_printf (_("Catchpoint %d (signals"), b->number);
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else
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gdb_printf (_("Catchpoint %d (signal"), b->number);
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for (gdb_signal iter : c->signals_to_be_caught)
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{
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const char *name = signal_to_name_or_int (iter);
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gdb_printf (" %s", name);
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}
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gdb_printf (")");
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}
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else if (c->catch_all)
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gdb_printf (_("Catchpoint %d (any signal)"), b->number);
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else
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gdb_printf (_("Catchpoint %d (standard signals)"), b->number);
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}
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/* Implement the "print_recreate" breakpoint_ops method for signal
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catchpoints. */
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static void
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signal_catchpoint_print_recreate (struct breakpoint *b, struct ui_file *fp)
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{
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struct signal_catchpoint *c = (struct signal_catchpoint *) b;
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gdb_printf (fp, "catch signal");
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if (!c->signals_to_be_caught.empty ())
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{
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for (gdb_signal iter : c->signals_to_be_caught)
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gdb_printf (fp, " %s", signal_to_name_or_int (iter));
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}
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else if (c->catch_all)
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gdb_printf (fp, " all");
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gdb_putc ('\n', fp);
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}
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/* Implement the "explains_signal" breakpoint_ops method for signal
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catchpoints. */
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static int
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signal_catchpoint_explains_signal (struct breakpoint *b, enum gdb_signal sig)
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{
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return 1;
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}
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/* Create a new signal catchpoint. TEMPFLAG is true if this should be
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a temporary catchpoint. FILTER is the list of signals to catch; it
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can be empty, meaning all signals. CATCH_ALL is a flag indicating
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whether signals used internally by gdb should be caught; it is only
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valid if FILTER is NULL. If FILTER is empty and CATCH_ALL is zero,
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then internal signals like SIGTRAP are not caught. */
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static void
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create_signal_catchpoint (int tempflag, std::vector<gdb_signal> &&filter,
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bool catch_all)
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{
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struct gdbarch *gdbarch = get_current_arch ();
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std::unique_ptr<signal_catchpoint> c (new signal_catchpoint ());
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init_catchpoint (c.get (), gdbarch, tempflag, NULL, &signal_catchpoint_ops);
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c->signals_to_be_caught = std::move (filter);
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c->catch_all = catch_all;
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install_breakpoint (0, std::move (c), 1);
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}
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/* Splits the argument using space as delimiter. Returns a filter
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list, which is empty if no filtering is required. */
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static std::vector<gdb_signal>
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catch_signal_split_args (const char *arg, bool *catch_all)
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{
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std::vector<gdb_signal> result;
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bool first = true;
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while (*arg != '\0')
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{
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int num;
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gdb_signal signal_number;
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char *endptr;
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std::string one_arg = extract_arg (&arg);
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if (one_arg.empty ())
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break;
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/* Check for the special flag "all". */
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if (one_arg == "all")
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{
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arg = skip_spaces (arg);
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if (*arg != '\0' || !first)
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error (_("'all' cannot be caught with other signals"));
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*catch_all = true;
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gdb_assert (result.empty ());
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return result;
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}
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first = false;
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/* Check if the user provided a signal name or a number. */
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num = (int) strtol (one_arg.c_str (), &endptr, 0);
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if (*endptr == '\0')
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signal_number = gdb_signal_from_command (num);
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else
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{
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signal_number = gdb_signal_from_name (one_arg.c_str ());
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if (signal_number == GDB_SIGNAL_UNKNOWN)
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error (_("Unknown signal name '%s'."), one_arg.c_str ());
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}
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result.push_back (signal_number);
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}
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result.shrink_to_fit ();
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return result;
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}
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/* Implement the "catch signal" command. */
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static void
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catch_signal_command (const char *arg, int from_tty,
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struct cmd_list_element *command)
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{
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int tempflag;
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bool catch_all = false;
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std::vector<gdb_signal> filter;
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tempflag = command->context () == CATCH_TEMPORARY;
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arg = skip_spaces (arg);
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/* The allowed syntax is:
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catch signal
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catch signal <name | number> [<name | number> ... <name | number>]
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Let's check if there's a signal name. */
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if (arg != NULL)
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filter = catch_signal_split_args (arg, &catch_all);
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create_signal_catchpoint (tempflag, std::move (filter), catch_all);
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}
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static void
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initialize_signal_catchpoint_ops (void)
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{
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struct breakpoint_ops *ops;
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initialize_breakpoint_ops ();
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ops = &signal_catchpoint_ops;
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*ops = base_breakpoint_ops;
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ops->insert_location = signal_catchpoint_insert_location;
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ops->remove_location = signal_catchpoint_remove_location;
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ops->breakpoint_hit = signal_catchpoint_breakpoint_hit;
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ops->print_it = signal_catchpoint_print_it;
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ops->print_one = signal_catchpoint_print_one;
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ops->print_mention = signal_catchpoint_print_mention;
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ops->print_recreate = signal_catchpoint_print_recreate;
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ops->explains_signal = signal_catchpoint_explains_signal;
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}
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void _initialize_break_catch_sig ();
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void
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_initialize_break_catch_sig ()
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{
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initialize_signal_catchpoint_ops ();
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add_catch_command ("signal", _("\
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Catch signals by their names and/or numbers.\n\
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Usage: catch signal [[NAME|NUMBER] [NAME|NUMBER]...|all]\n\
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Arguments say which signals to catch. If no arguments\n\
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are given, every \"normal\" signal will be caught.\n\
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The argument \"all\" means to also catch signals used by GDB.\n\
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Arguments, if given, should be one or more signal names\n\
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(if your system supports that), or signal numbers."),
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catch_signal_command,
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signal_completer,
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CATCH_PERMANENT,
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CATCH_TEMPORARY);
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}
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