309 lines
8.4 KiB
C
309 lines
8.4 KiB
C
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/* Everything about catch/throw catchpoints, for GDB.
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Copyright (C) 1986-2013 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 "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 "gdb_obstack.h"
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#include "mi/mi-common.h"
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/* Enums for exception-handling support. */
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enum exception_event_kind
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{
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EX_EVENT_THROW,
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EX_EVENT_RETHROW,
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EX_EVENT_CATCH
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};
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/* A helper function that returns a value indicating the kind of the
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exception catchpoint B. */
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static enum exception_event_kind
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classify_exception_breakpoint (struct breakpoint *b)
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{
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if (strstr (b->addr_string, "catch") != NULL)
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return EX_EVENT_CATCH;
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else if (strstr (b->addr_string, "rethrow") != NULL)
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return EX_EVENT_RETHROW;
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else
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return EX_EVENT_THROW;
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}
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static enum print_stop_action
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print_it_exception_catchpoint (bpstat bs)
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{
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struct ui_out *uiout = current_uiout;
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struct breakpoint *b = bs->breakpoint_at;
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int bp_temp;
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enum exception_event_kind kind = classify_exception_breakpoint (b);
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annotate_catchpoint (b->number);
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bp_temp = b->disposition == disp_del;
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ui_out_text (uiout,
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bp_temp ? "Temporary catchpoint "
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: "Catchpoint ");
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if (!ui_out_is_mi_like_p (uiout))
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ui_out_field_int (uiout, "bkptno", b->number);
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ui_out_text (uiout,
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(kind == EX_EVENT_THROW ? " (exception thrown), "
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: (kind == EX_EVENT_CATCH ? " (exception caught), "
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: " (exception rethrown), ")));
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if (ui_out_is_mi_like_p (uiout))
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{
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ui_out_field_string (uiout, "reason",
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async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT));
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ui_out_field_string (uiout, "disp", bpdisp_text (b->disposition));
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ui_out_field_int (uiout, "bkptno", b->number);
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}
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return PRINT_SRC_AND_LOC;
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}
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static void
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print_one_exception_catchpoint (struct breakpoint *b,
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struct bp_location **last_loc)
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{
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struct value_print_options opts;
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struct ui_out *uiout = current_uiout;
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enum exception_event_kind kind = classify_exception_breakpoint (b);
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get_user_print_options (&opts);
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if (opts.addressprint)
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{
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annotate_field (4);
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if (b->loc == NULL || b->loc->shlib_disabled)
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ui_out_field_string (uiout, "addr", "<PENDING>");
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else
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ui_out_field_core_addr (uiout, "addr",
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b->loc->gdbarch, b->loc->address);
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}
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annotate_field (5);
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if (b->loc)
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*last_loc = b->loc;
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switch (kind)
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{
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case EX_EVENT_THROW:
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ui_out_field_string (uiout, "what", "exception throw");
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if (ui_out_is_mi_like_p (uiout))
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ui_out_field_string (uiout, "catch-type", "throw");
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break;
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case EX_EVENT_RETHROW:
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ui_out_field_string (uiout, "what", "exception rethrow");
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if (ui_out_is_mi_like_p (uiout))
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ui_out_field_string (uiout, "catch-type", "rethrow");
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break;
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case EX_EVENT_CATCH:
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ui_out_field_string (uiout, "what", "exception catch");
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if (ui_out_is_mi_like_p (uiout))
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ui_out_field_string (uiout, "catch-type", "catch");
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break;
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}
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}
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static void
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print_mention_exception_catchpoint (struct breakpoint *b)
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{
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struct ui_out *uiout = current_uiout;
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int bp_temp;
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enum exception_event_kind kind = classify_exception_breakpoint (b);
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bp_temp = b->disposition == disp_del;
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ui_out_text (uiout, bp_temp ? _("Temporary catchpoint ")
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: _("Catchpoint "));
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ui_out_field_int (uiout, "bkptno", b->number);
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ui_out_text (uiout, (kind == EX_EVENT_THROW ? _(" (throw)")
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: (kind == EX_EVENT_CATCH ? _(" (catch)")
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: _(" (rethrow)"))));
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}
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/* Implement the "print_recreate" breakpoint_ops method for throw and
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catch catchpoints. */
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static void
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print_recreate_exception_catchpoint (struct breakpoint *b,
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struct ui_file *fp)
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{
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int bp_temp;
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enum exception_event_kind kind = classify_exception_breakpoint (b);
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bp_temp = b->disposition == disp_del;
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fprintf_unfiltered (fp, bp_temp ? "tcatch " : "catch ");
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switch (kind)
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{
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case EX_EVENT_THROW:
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fprintf_unfiltered (fp, "throw");
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break;
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case EX_EVENT_CATCH:
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fprintf_unfiltered (fp, "catch");
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break;
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case EX_EVENT_RETHROW:
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fprintf_unfiltered (fp, "rethrow");
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break;
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}
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print_recreate_thread (b, fp);
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}
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static struct breakpoint_ops gnu_v3_exception_catchpoint_ops;
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static int
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handle_gnu_v3_exceptions (int tempflag, char *cond_string,
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enum exception_event_kind ex_event, int from_tty)
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{
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char *trigger_func_name;
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if (ex_event == EX_EVENT_CATCH)
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trigger_func_name = "__cxa_begin_catch";
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else if (ex_event == EX_EVENT_RETHROW)
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trigger_func_name = "__cxa_rethrow";
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else
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{
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gdb_assert (ex_event == EX_EVENT_THROW);
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trigger_func_name = "__cxa_throw";
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}
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create_breakpoint (get_current_arch (),
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trigger_func_name, cond_string, -1, NULL,
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0 /* condition and thread are valid. */,
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tempflag, bp_breakpoint,
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0,
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AUTO_BOOLEAN_TRUE /* pending */,
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&gnu_v3_exception_catchpoint_ops, from_tty,
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1 /* enabled */,
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0 /* internal */,
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0);
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return 1;
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}
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/* Deal with "catch catch", "catch throw", and "catch rethrow"
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commands. */
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static void
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catch_exception_command_1 (enum exception_event_kind ex_event, char *arg,
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int tempflag, int from_tty)
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{
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char *cond_string = NULL;
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if (!arg)
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arg = "";
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arg = skip_spaces (arg);
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cond_string = ep_parse_optional_if_clause (&arg);
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if ((*arg != '\0') && !isspace (*arg))
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error (_("Junk at end of arguments."));
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if (ex_event != EX_EVENT_THROW
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&& ex_event != EX_EVENT_CATCH
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&& ex_event != EX_EVENT_RETHROW)
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error (_("Unsupported or unknown exception event; cannot catch it"));
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if (handle_gnu_v3_exceptions (tempflag, cond_string, ex_event, from_tty))
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return;
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warning (_("Unsupported with this platform/compiler combination."));
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}
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/* Implementation of "catch catch" command. */
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static void
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catch_catch_command (char *arg, int from_tty, struct cmd_list_element *command)
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{
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int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
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catch_exception_command_1 (EX_EVENT_CATCH, arg, tempflag, from_tty);
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}
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/* Implementation of "catch throw" command. */
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static void
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catch_throw_command (char *arg, int from_tty, struct cmd_list_element *command)
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{
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int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
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catch_exception_command_1 (EX_EVENT_THROW, arg, tempflag, from_tty);
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}
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/* Implementation of "catch rethrow" command. */
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static void
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catch_rethrow_command (char *arg, int from_tty,
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struct cmd_list_element *command)
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{
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int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
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catch_exception_command_1 (EX_EVENT_RETHROW, arg, tempflag, from_tty);
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}
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static void
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initialize_throw_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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/* GNU v3 exception catchpoints. */
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ops = &gnu_v3_exception_catchpoint_ops;
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*ops = bkpt_breakpoint_ops;
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ops->print_it = print_it_exception_catchpoint;
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ops->print_one = print_one_exception_catchpoint;
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ops->print_mention = print_mention_exception_catchpoint;
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ops->print_recreate = print_recreate_exception_catchpoint;
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}
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initialize_file_ftype _initialize_break_catch_throw;
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void
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_initialize_break_catch_throw (void)
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{
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initialize_throw_catchpoint_ops ();
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/* Add catch and tcatch sub-commands. */
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add_catch_command ("catch", _("\
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Catch an exception, when caught."),
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catch_catch_command,
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NULL,
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CATCH_PERMANENT,
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CATCH_TEMPORARY);
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add_catch_command ("throw", _("\
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Catch an exception, when thrown."),
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catch_throw_command,
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NULL,
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CATCH_PERMANENT,
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CATCH_TEMPORARY);
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add_catch_command ("rethrow", _("\
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Catch an exception, when rethrown."),
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catch_rethrow_command,
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NULL,
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CATCH_PERMANENT,
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CATCH_TEMPORARY);
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}
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