c1fc265720
Breakpoints are currently in a limbo state between C and C++. There is a pseudo class hierarchy implemented using struct fields. Taking watchpoint as an example: struct watchpoint { /* The base class. */ struct breakpoint base; ... } and it is instantianted with "new watchpoint ()". When destroyed, a destructor is first invoked through the breakpoint_ops, and then the memory is freed by calling delete through a pointer to breakpoint. Address sanitizer complains about this, for example, because we new and delete the same memory using different types. This patch takes the logical step of making breakpoint subclasses extend the breakpoint class for real, and converts their destructors to actual C++ destructors. Regtested on the buildbot. gdb/ChangeLog: * breakpoint.h (struct breakpoint_ops) <dtor>: Remove. (struct breakpoint) <~breakpoint>: New. (struct watchpoint): Inherit from breakpoint. <~watchpoint>: New. <base>: Remove. (struct tracepoint): Inherit from breakpoint. <base>: Remove. * breakpoint.c (longjmp_breakpoint_ops): Remove. (struct longjmp_breakpoint): Inherit from breakpoint. <~longjmp_breakpoint>: New. <base>: Remove. (new_breakpoint_from_type): Remove casts. (watchpoint_in_thread_scope): Remove reference to base field. (watchpoint_del_at_next_stop): Likewise. (update_watchpoint): Likewise. (watchpoint_check): Likewise. (bpstat_check_watchpoint): Likewise. (set_longjmp_breakpoint): Likewise. (struct fork_catchpoint): Inherit from breakpoint. <base>: Remove. (struct solib_catchpoint): Inherit from breakpoint. <~solib_catchpoint>: New. <base>: Remove. (dtor_catch_solib): Change to ... (solib_catchpoint::~solib_catchpoint): ... this. (breakpoint_hit_catch_solib): Remove reference to base field. (add_solib_catchpoint): Likewise. (create_fork_vfork_event_catchpoint): Likewise. (struct exec_catchpoint): Inherit from breakpoint. <~exec_catchpoint>: New. <base>: Remove. (dtor_catch_exec): Change to ... (exec_catchpoint::~exec_catchpoint): ... this. (dtor_watchpoint): Change to ... (watchpoint::~watchpoint): ... this. (watch_command_1): Remove reference to base field. (catch_exec_command_1): Likewise. (base_breakpoint_dtor): Change to ... (breakpoint::~breakpoint): ... this. (base_breakpoint_ops): Remove dtor field value. (longjmp_bkpt_dtor): Change to ... (longjmp_breakpoint::~longjmp_breakpoint): ... this. (strace_marker_create_breakpoints_sal): Remove reference to base field. (delete_breakpoint): Don't manually call breakpoint destructor. (create_tracepoint_from_upload): Remove reference to base field. (trace_pass_set_count): Likewise. (initialize_breakpoint_ops): Don't initialize momentary_breakpoint_ops, don't set dtors. * ada-lang.c (struct ada_catchpoint): Inherit from breakpoint. <~ada_catchpoint>: New. <base>: Remove. (create_excep_cond_exprs): Remove reference to base field. (dtor_exception): Change to ... (ada_catchpoint::~ada_catchpoint): ... this. (dtor_catch_exception): Remove. (dtor_catch_exception_unhandled): Remove. (dtor_catch_assert): Remove. (create_ada_exception_catchpoint): Remove reference to base field. (initialize_ada_catchpoint_ops): Don't set dtors. * break-catch-sig.c (struct signal_catchpoint): Inherit from breakpoint. <~signal_catchpoint>: New. <base>: Remove. (signal_catchpoint_dtor): Change to ... (signal_catchpoint::~signal_catchpoint): ... this. (create_signal_catchpoint): Remove reference to base field. (initialize_signal_catchpoint_ops): Don't set dtor. * break-catch-syscall.c (struct syscall_catchpoint): Inherit from breakpoint. <~syscall_catchpoint>: New. <base>: Remove. (dtor_catch_syscall): Change to ... (syscall_catchpoint::~syscall_catchpoint): ... this. (create_syscall_event_catchpoint): Remove reference to base field. (initialize_syscall_catchpoint_ops): Don't set dtor. * break-catch-throw.c (struct exception_catchpoint): Inherit from breakpoint. <~exception_catchpoint>: New. <base>: Remove. (dtor_exception_catchpoint): Change to ... (exception_catchpoint::~exception_catchpoint): ... this. (handle_gnu_v3_exceptions): Remove reference to base field. (initialize_throw_catchpoint_ops): Don't set dtor. * ctf.c (ctf_get_traceframe_address): Remove reference to base field. * remote.c (remote_get_tracepoint_status): Likewise. * tracefile-tfile.c (tfile_get_traceframe_address): Likewise. * tracefile.c (tracefile_fetch_registers): Likewise. * tracepoint.c (actions_command): Likewise. (validate_actionline): Likewise. (tfind_1): Likewise. (get_traceframe_location): Likewise. (find_matching_tracepoint_location): Likewise. (parse_tracepoint_status): Likewise. * mi/mi-cmd-break.c (mi_cmd_break_passcount): Likewise.
593 lines
16 KiB
C
593 lines
16 KiB
C
/* Everything about catch/throw catchpoints, for GDB.
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Copyright (C) 1986-2017 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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#include "linespec.h"
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#include "probe.h"
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#include "objfiles.h"
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#include "cp-abi.h"
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#include "gdb_regex.h"
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#include "cp-support.h"
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#include "location.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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/* Each spot where we may place an exception-related catchpoint has
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two names: the SDT probe point and the function name. This
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structure holds both. */
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struct exception_names
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{
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/* The name of the probe point to try, in the form accepted by
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'parse_probes'. */
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const char *probe;
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/* The name of the corresponding function. */
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const char *function;
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};
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/* Names of the probe points and functions on which to break. This is
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indexed by exception_event_kind. */
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static const struct exception_names exception_functions[] =
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{
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{ "-probe-stap libstdcxx:throw", "__cxa_throw" },
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{ "-probe-stap libstdcxx:rethrow", "__cxa_rethrow" },
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{ "-probe-stap libstdcxx:catch", "__cxa_begin_catch" }
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};
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static struct breakpoint_ops gnu_v3_exception_catchpoint_ops;
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/* The type of an exception catchpoint. */
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struct exception_catchpoint : public breakpoint
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{
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~exception_catchpoint () override;
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/* The kind of exception catchpoint. */
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enum exception_event_kind kind;
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/* If non-NULL, an xmalloc'd string holding the source form of the
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regular expression to match against. */
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char *exception_rx;
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/* If non-NULL, an xmalloc'd, compiled regular expression which is
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used to determine which exceptions to stop on. */
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regex_t *pattern;
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};
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/* A helper function that fetches exception probe arguments. This
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fills in *ARG0 (if non-NULL) and *ARG1 (which must be non-NULL).
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It will throw an exception on any kind of failure. */
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static void
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fetch_probe_arguments (struct value **arg0, struct value **arg1)
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{
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struct frame_info *frame = get_selected_frame (_("No frame selected"));
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CORE_ADDR pc = get_frame_pc (frame);
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struct bound_probe pc_probe;
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unsigned n_args;
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pc_probe = find_probe_by_pc (pc);
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if (pc_probe.probe == NULL
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|| strcmp (pc_probe.probe->provider, "libstdcxx") != 0
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|| (strcmp (pc_probe.probe->name, "catch") != 0
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&& strcmp (pc_probe.probe->name, "throw") != 0
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&& strcmp (pc_probe.probe->name, "rethrow") != 0))
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error (_("not stopped at a C++ exception catchpoint"));
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n_args = get_probe_argument_count (pc_probe.probe, frame);
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if (n_args < 2)
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error (_("C++ exception catchpoint has too few arguments"));
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if (arg0 != NULL)
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*arg0 = evaluate_probe_argument (pc_probe.probe, 0, frame);
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*arg1 = evaluate_probe_argument (pc_probe.probe, 1, frame);
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if ((arg0 != NULL && *arg0 == NULL) || *arg1 == NULL)
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error (_("error computing probe argument at c++ exception catchpoint"));
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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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struct exception_catchpoint *cp = (struct exception_catchpoint *) b;
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return cp->kind;
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}
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/* exception_catchpoint destructor. */
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exception_catchpoint::~exception_catchpoint ()
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{
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xfree (this->exception_rx);
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if (this->pattern != NULL)
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regfree (this->pattern);
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}
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/* Implement the 'check_status' method. */
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static void
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check_status_exception_catchpoint (struct bpstats *bs)
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{
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struct exception_catchpoint *self
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= (struct exception_catchpoint *) bs->breakpoint_at;
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std::string type_name;
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bkpt_breakpoint_ops.check_status (bs);
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if (bs->stop == 0)
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return;
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if (self->pattern == NULL)
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return;
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TRY
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{
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struct value *typeinfo_arg;
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std::string canon;
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fetch_probe_arguments (NULL, &typeinfo_arg);
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type_name = cplus_typename_from_type_info (typeinfo_arg);
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canon = cp_canonicalize_string (type_name.c_str ());
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if (!canon.empty ())
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std::swap (type_name, canon);
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}
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CATCH (e, RETURN_MASK_ERROR)
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{
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exception_print (gdb_stderr, e);
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}
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END_CATCH
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if (!type_name.empty ())
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{
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if (regexec (self->pattern, type_name.c_str (), 0, NULL, 0) != 0)
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bs->stop = 0;
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}
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}
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/* Implement the 're_set' method. */
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static void
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re_set_exception_catchpoint (struct breakpoint *self)
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{
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struct symtabs_and_lines sals = {0};
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struct symtabs_and_lines sals_end = {0};
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struct cleanup *cleanup;
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enum exception_event_kind kind = classify_exception_breakpoint (self);
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struct program_space *filter_pspace = current_program_space;
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/* We first try to use the probe interface. */
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TRY
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{
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event_location_up location
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= new_probe_location (exception_functions[kind].probe);
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sals = parse_probes (location.get (), filter_pspace, NULL);
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}
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CATCH (e, RETURN_MASK_ERROR)
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{
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/* Using the probe interface failed. Let's fallback to the normal
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catchpoint mode. */
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TRY
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{
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struct explicit_location explicit_loc;
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initialize_explicit_location (&explicit_loc);
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explicit_loc.function_name
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= ASTRDUP (exception_functions[kind].function);
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event_location_up location = new_explicit_location (&explicit_loc);
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self->ops->decode_location (self, location.get (), filter_pspace,
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&sals);
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}
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CATCH (ex, RETURN_MASK_ERROR)
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{
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/* NOT_FOUND_ERROR just means the breakpoint will be
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pending, so let it through. */
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if (ex.error != NOT_FOUND_ERROR)
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throw_exception (ex);
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}
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END_CATCH
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}
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END_CATCH
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cleanup = make_cleanup (xfree, sals.sals);
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update_breakpoint_locations (self, filter_pspace, sals, sals_end);
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do_cleanups (cleanup);
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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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maybe_print_thread_hit_breakpoint (uiout);
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bp_temp = b->disposition == disp_del;
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uiout->text (bp_temp ? "Temporary catchpoint "
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: "Catchpoint ");
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if (!uiout->is_mi_like_p ())
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uiout->field_int ("bkptno", b->number);
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uiout->text ((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 (uiout->is_mi_like_p ())
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{
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uiout->field_string ("reason",
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async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT));
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uiout->field_string ("disp", bpdisp_text (b->disposition));
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uiout->field_int ("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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uiout->field_string ("addr", "<PENDING>");
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else
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uiout->field_core_addr ("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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uiout->field_string ("what", "exception throw");
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if (uiout->is_mi_like_p ())
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uiout->field_string ("catch-type", "throw");
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break;
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case EX_EVENT_RETHROW:
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uiout->field_string ("what", "exception rethrow");
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if (uiout->is_mi_like_p ())
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uiout->field_string ("catch-type", "rethrow");
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break;
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case EX_EVENT_CATCH:
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uiout->field_string ("what", "exception catch");
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if (uiout->is_mi_like_p ())
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uiout->field_string ("catch-type", "catch");
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break;
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}
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}
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/* Implement the 'print_one_detail' method. */
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static void
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print_one_detail_exception_catchpoint (const struct breakpoint *b,
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struct ui_out *uiout)
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{
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const struct exception_catchpoint *cp
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= (const struct exception_catchpoint *) b;
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if (cp->exception_rx != NULL)
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{
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uiout->text (_("\tmatching: "));
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uiout->field_string ("regexp", cp->exception_rx);
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uiout->text ("\n");
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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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uiout->text (bp_temp ? _("Temporary catchpoint ")
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: _("Catchpoint "));
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uiout->field_int ("bkptno", b->number);
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uiout->text ((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 void
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handle_gnu_v3_exceptions (int tempflag, char *except_rx,
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const char *cond_string,
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enum exception_event_kind ex_event, int from_tty)
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{
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regex_t *pattern = NULL;
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if (except_rx != NULL)
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{
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pattern = XNEW (regex_t);
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make_cleanup (xfree, pattern);
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compile_rx_or_error (pattern, except_rx,
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_("invalid type-matching regexp"));
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}
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std::unique_ptr<exception_catchpoint> cp (new exception_catchpoint ());
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init_catchpoint (cp.get (), get_current_arch (), tempflag, cond_string,
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&gnu_v3_exception_catchpoint_ops);
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/* We need to reset 'type' in order for code in breakpoint.c to do
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the right thing. */
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cp->type = bp_breakpoint;
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cp->kind = ex_event;
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cp->exception_rx = except_rx;
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cp->pattern = pattern;
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re_set_exception_catchpoint (cp.get ());
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install_breakpoint (0, cp.get (), 1);
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cp.release ();
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}
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/* Look for an "if" token in *STRING. The "if" token must be preceded
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by whitespace.
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If there is any non-whitespace text between *STRING and the "if"
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token, then it is returned in a newly-xmalloc'd string. Otherwise,
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this returns NULL.
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STRING is updated to point to the "if" token, if it exists, or to
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the end of the string. */
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static char *
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extract_exception_regexp (const char **string)
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{
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const char *start;
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const char *last, *last_space;
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start = skip_spaces_const (*string);
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last = start;
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last_space = start;
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while (*last != '\0')
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{
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const char *if_token = last;
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/* Check for the "if". */
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if (check_for_argument (&if_token, "if", 2))
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break;
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/* No "if" token here. Skip to the next word start. */
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last_space = skip_to_space (last);
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last = skip_spaces_const (last_space);
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}
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*string = last;
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if (last_space > start)
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return savestring (start, last_space - start);
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return NULL;
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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,
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char *arg_entry,
|
||
int tempflag, int from_tty)
|
||
{
|
||
char *except_rx;
|
||
const char *cond_string = NULL;
|
||
struct cleanup *cleanup;
|
||
const char *arg = arg_entry;
|
||
|
||
if (!arg)
|
||
arg = "";
|
||
arg = skip_spaces_const (arg);
|
||
|
||
except_rx = extract_exception_regexp (&arg);
|
||
cleanup = make_cleanup (xfree, except_rx);
|
||
|
||
cond_string = ep_parse_optional_if_clause (&arg);
|
||
|
||
if ((*arg != '\0') && !isspace (*arg))
|
||
error (_("Junk at end of arguments."));
|
||
|
||
if (ex_event != EX_EVENT_THROW
|
||
&& ex_event != EX_EVENT_CATCH
|
||
&& ex_event != EX_EVENT_RETHROW)
|
||
error (_("Unsupported or unknown exception event; cannot catch it"));
|
||
|
||
handle_gnu_v3_exceptions (tempflag, except_rx, cond_string,
|
||
ex_event, from_tty);
|
||
|
||
discard_cleanups (cleanup);
|
||
}
|
||
|
||
/* Implementation of "catch catch" command. */
|
||
|
||
static void
|
||
catch_catch_command (char *arg, int from_tty, struct cmd_list_element *command)
|
||
{
|
||
int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
|
||
|
||
catch_exception_command_1 (EX_EVENT_CATCH, arg, tempflag, from_tty);
|
||
}
|
||
|
||
/* Implementation of "catch throw" command. */
|
||
|
||
static void
|
||
catch_throw_command (char *arg, int from_tty, struct cmd_list_element *command)
|
||
{
|
||
int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
|
||
|
||
catch_exception_command_1 (EX_EVENT_THROW, arg, tempflag, from_tty);
|
||
}
|
||
|
||
/* Implementation of "catch rethrow" command. */
|
||
|
||
static void
|
||
catch_rethrow_command (char *arg, int from_tty,
|
||
struct cmd_list_element *command)
|
||
{
|
||
int tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
|
||
|
||
catch_exception_command_1 (EX_EVENT_RETHROW, arg, tempflag, from_tty);
|
||
}
|
||
|
||
|
||
|
||
/* Implement the 'make_value' method for the $_exception
|
||
internalvar. */
|
||
|
||
static struct value *
|
||
compute_exception (struct gdbarch *argc, struct internalvar *var, void *ignore)
|
||
{
|
||
struct value *arg0, *arg1;
|
||
struct type *obj_type;
|
||
|
||
fetch_probe_arguments (&arg0, &arg1);
|
||
|
||
/* ARG0 is a pointer to the exception object. ARG1 is a pointer to
|
||
the std::type_info for the exception. Now we find the type from
|
||
the type_info and cast the result. */
|
||
obj_type = cplus_type_from_type_info (arg1);
|
||
return value_ind (value_cast (make_pointer_type (obj_type, NULL), arg0));
|
||
}
|
||
|
||
/* Implementation of the '$_exception' variable. */
|
||
|
||
static const struct internalvar_funcs exception_funcs =
|
||
{
|
||
compute_exception,
|
||
NULL,
|
||
NULL
|
||
};
|
||
|
||
|
||
|
||
static void
|
||
initialize_throw_catchpoint_ops (void)
|
||
{
|
||
struct breakpoint_ops *ops;
|
||
|
||
initialize_breakpoint_ops ();
|
||
|
||
/* GNU v3 exception catchpoints. */
|
||
ops = &gnu_v3_exception_catchpoint_ops;
|
||
*ops = bkpt_breakpoint_ops;
|
||
ops->re_set = re_set_exception_catchpoint;
|
||
ops->print_it = print_it_exception_catchpoint;
|
||
ops->print_one = print_one_exception_catchpoint;
|
||
ops->print_mention = print_mention_exception_catchpoint;
|
||
ops->print_recreate = print_recreate_exception_catchpoint;
|
||
ops->print_one_detail = print_one_detail_exception_catchpoint;
|
||
ops->check_status = check_status_exception_catchpoint;
|
||
}
|
||
|
||
initialize_file_ftype _initialize_break_catch_throw;
|
||
|
||
void
|
||
_initialize_break_catch_throw (void)
|
||
{
|
||
initialize_throw_catchpoint_ops ();
|
||
|
||
/* Add catch and tcatch sub-commands. */
|
||
add_catch_command ("catch", _("\
|
||
Catch an exception, when caught."),
|
||
catch_catch_command,
|
||
NULL,
|
||
CATCH_PERMANENT,
|
||
CATCH_TEMPORARY);
|
||
add_catch_command ("throw", _("\
|
||
Catch an exception, when thrown."),
|
||
catch_throw_command,
|
||
NULL,
|
||
CATCH_PERMANENT,
|
||
CATCH_TEMPORARY);
|
||
add_catch_command ("rethrow", _("\
|
||
Catch an exception, when rethrown."),
|
||
catch_rethrow_command,
|
||
NULL,
|
||
CATCH_PERMANENT,
|
||
CATCH_TEMPORARY);
|
||
|
||
create_internalvar_type_lazy ("_exception", &exception_funcs, NULL);
|
||
}
|