"catch catch/throw/rethrow", breakpoint -> catchpoint
Currently, with:
(gdb) catch catch
Catchpoint 1 (catch)
(gdb) catch throw
Catchpoint 2 (throw)
(gdb) catch rethrow
Catchpoint 3 (rethrow)
You get:
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000000000b122af exception catch
2 breakpoint keep y 0x0000000000b1288d exception throw
3 breakpoint keep y 0x0000000000b12931 exception rethrow
I think it doesn't make much sense usability-wise, to show a
catchpoint as a breakpoint. The fact that GDB sets a breakpoint at
some magic address in the C++ run time is an implementation detail,
IMO. And as seen in the previous patch, such a catchpoint can end up
with more than one location/address even, so showing a single address
isn't entirely accurate.
This commit hides the addresses from view, and makes GDB show
"catchpoint" for type as well:
(gdb) info breakpoints
Num Type Disp Enb Address What
1 catchpoint keep y exception catch
2 catchpoint keep y exception throw
3 catchpoint keep y exception rethrow
This comment in the code seems telling:
/* We need to reset 'type' in order for code in breakpoint.c to do
the right thing. */
cp->type = bp_breakpoint;
It kind of suggests that the reason catchpoints end up shown as
breakpoints was that it was easier to implement them that way, rather
than a desired property.
This commit fixes things up to make it possible to have bp_catch
breakpoints have software/hardware breakpoint locations, thus
eliminating the need for that hack:
- redo breakpoint_address_is_meaningful in terms of the location's
type rather than breakpoint type.
- teach bpstat_what about stepping over the catchpoint locations.
- install a allocate_location method for "catch catch/throw/rethrow",
one that forces the location type.
Note that this also reverts the gdb hunk from:
commit 2a8be20359
Commit: Tom Tromey <tom@tromey.com>
CommitDate: Sat Oct 6 22:17:45 2018 -0600
Fix Python gdb.Breakpoint.location crash
because now "catch throw" catchpoints hit the
if (obj->bp->type != bp_breakpoint)
Py_RETURN_NONE;
check above, and, adjusts the testcase to no longer expect to see the
catchpoint in the gdb.breakpoints() list.
(Note: might make sense to do the same to Ada exception catchpoints.)
gdb/ChangeLog:
2019-07-09 Pedro Alves <palves@redhat.com>
* break-catch-throw.c (print_one_exception_catchpoint): Skip the
"addr" field.
(allocate_location_exception_catchpoint): New.
(handle_gnu_v3_exceptions): Don't reset 'type' to bp_breakpoint.
(initialize_throw_catchpoint_ops): Install
allocate_location_exception_catchpoint as allocate_location
method.
* breakpoint.c (bpstat_what) <bp_catch>: Set action to
BPSTAT_WHAT_SINGLE if not stopping and the location's type is not
bp_loc_other.
(breakpoint_address_is_meaningful): Delete.
(bl_address_is_meaningful): New.
(breakpoint_locations_match): Adjust comment.
(bp_location_from_bp_type): New, factored out of...
(bp_location::bp_location(breakpoint *)): ... this.
(bp_location::bp_location(breakpoint *, bp_loc_type)): New,
factored out of...
(bp_location::bp_location(breakpoint *)): ... this. Reimplement.
(bp_loc_is_permanent): Use bl_address_is_meaningful instead of
breakpoint_address_is_meaningful.
(bp_locations_compare): Adjust comment.
(update_global_location_list): Use bl_address_is_meaningful
instead of breakpoint_address_is_meaningful.
* breakpoint.h (bp_location::bp_location(breakpoint *)): New
explicit.
(bp_location::bp_location(breakpoint *, bp_loc_type)): Declare.
* python/py-breakpoint.c (bppy_get_location): No longer check
whether location is null.
gdb/doc/ChangeLog:
2019-07-09 Pedro Alves <palves@redhat.com>
* gdb.texinfo (C++ Exception GDB/MI Catchpoint Commands): Adjust
examples to show type=catchpoint instead of type=breakpoint and an
address.
gdb/testsuite/ChangeLog:
2019-07-09 Pedro Alves <palves@redhat.com>
* gdb.cp/catch-multi-stdlib.exp: Adjust expected "info
breakpoints" output.
* gdb.cp/exception.exp: Adjust expected "info breakpoints" output.
* gdb.python/py-breakpoint.exp: No longer expect that "catch
throw" creates breakpoint.
* gdb.mi/mi-catch-cpp-exceptions.exp (setup_catchpoint): Expect
'type="catchpoint"'.
This commit is contained in:
Pedro Alves
parent
b58a68fe57
commit
cb1e4e32c2
@ -1,3 +1,34 @@
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2019-07-09 Pedro Alves <palves@redhat.com>
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* break-catch-throw.c (print_one_exception_catchpoint): Skip the
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"addr" field.
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(allocate_location_exception_catchpoint): New.
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(handle_gnu_v3_exceptions): Don't reset 'type' to bp_breakpoint.
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(initialize_throw_catchpoint_ops): Install
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allocate_location_exception_catchpoint as allocate_location
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method.
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* breakpoint.c (bpstat_what) <bp_catch>: Set action to
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BPSTAT_WHAT_SINGLE if not stopping and the location's type is not
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bp_loc_other.
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(breakpoint_address_is_meaningful): Delete.
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(bl_address_is_meaningful): New.
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(breakpoint_locations_match): Adjust comment.
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(bp_location_from_bp_type): New, factored out of...
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(bp_location::bp_location(breakpoint *)): ... this.
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(bp_location::bp_location(breakpoint *, bp_loc_type)): New,
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factored out of...
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(bp_location::bp_location(breakpoint *)): ... this. Reimplement.
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(bp_loc_is_permanent): Use bl_address_is_meaningful instead of
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breakpoint_address_is_meaningful.
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(bp_locations_compare): Adjust comment.
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(update_global_location_list): Use bl_address_is_meaningful
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instead of breakpoint_address_is_meaningful.
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* breakpoint.h (bp_location::bp_location(breakpoint *)): New
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explicit.
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(bp_location::bp_location(breakpoint *, bp_loc_type)): Declare.
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* python/py-breakpoint.c (bppy_get_location): No longer check
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whether location is null.
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2019-07-09 Pedro Alves <palves@redhat.com>
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PR c++/15468
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@ -249,18 +249,10 @@ print_one_exception_catchpoint (struct breakpoint *b,
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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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uiout->field_skip ("addr");
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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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@ -344,6 +336,15 @@ print_recreate_exception_catchpoint (struct breakpoint *b,
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print_recreate_thread (b, fp);
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}
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/* Implement the "allocate_location" breakpoint_ops method for throw
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and catch catchpoints. */
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static bp_location *
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allocate_location_exception_catchpoint (breakpoint *self)
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{
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return new bp_location (self, bp_loc_software_breakpoint);
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}
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static void
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handle_gnu_v3_exceptions (int tempflag, std::string &&except_rx,
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const char *cond_string,
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@ -361,9 +362,6 @@ handle_gnu_v3_exceptions (int tempflag, std::string &&except_rx,
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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 = std::move (except_rx);
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cp->pattern = std::move (pattern);
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@ -521,6 +519,7 @@ initialize_throw_catchpoint_ops (void)
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ops->print_recreate = print_recreate_exception_catchpoint;
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ops->print_one_detail = print_one_detail_exception_catchpoint;
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ops->check_status = check_status_exception_catchpoint;
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ops->allocate_location = allocate_location_exception_catchpoint;
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}
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void
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108
gdb/breakpoint.c
108
gdb/breakpoint.c
@ -5603,8 +5603,10 @@ bpstat_what (bpstat bs_head)
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}
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else
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{
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/* There was a catchpoint, but we're not stopping.
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This requires no further action. */
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/* Some catchpoints are implemented with breakpoints.
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For those, we need to step over the breakpoint. */
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if (bs->bp_location_at->loc_type != bp_loc_other)
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this_action = BPSTAT_WHAT_SINGLE;
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}
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break;
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case bp_jit_event:
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@ -6686,27 +6688,21 @@ describe_other_breakpoints (struct gdbarch *gdbarch,
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}
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/* Return true iff it is meaningful to use the address member of
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BPT locations. For some breakpoint types, the locations' address members
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are irrelevant and it makes no sense to attempt to compare them to other
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addresses (or use them for any other purpose either).
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/* Return true iff it is meaningful to use the address member of LOC.
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For some breakpoint types, the locations' address members are
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irrelevant and it makes no sense to attempt to compare them to
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other addresses (or use them for any other purpose either).
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More specifically, each of the following breakpoint types will
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always have a zero valued location address and we don't want to mark
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breakpoints of any of these types to be a duplicate of an actual
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breakpoint location at address zero:
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More specifically, software watchpoints and catchpoints that are
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not backed by breakpoints always have a zero valued location
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address and we don't want to mark breakpoints of any of these types
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to be a duplicate of an actual breakpoint location at address
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zero. */
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bp_watchpoint
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bp_catchpoint
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*/
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static int
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breakpoint_address_is_meaningful (struct breakpoint *bpt)
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static bool
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bl_address_is_meaningful (bp_location *loc)
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{
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enum bptype type = bpt->type;
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return (type != bp_watchpoint && type != bp_catchpoint);
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return loc->loc_type != bp_loc_other;
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}
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/* Assuming LOC1 and LOC2's owners are hardware watchpoints, returns
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@ -6838,8 +6834,8 @@ tracepoint_locations_match (struct bp_location *loc1,
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}
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/* Assuming LOC1 and LOC2's types' have meaningful target addresses
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(breakpoint_address_is_meaningful), returns true if LOC1 and LOC2
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represent the same location. */
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(bl_address_is_meaningful), returns true if LOC1 and LOC2 represent
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the same location. */
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static int
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breakpoint_locations_match (struct bp_location *loc1,
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@ -6937,16 +6933,10 @@ adjust_breakpoint_address (struct gdbarch *gdbarch,
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}
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}
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bp_location::bp_location (breakpoint *owner)
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static bp_loc_type
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bp_location_from_bp_type (bptype type)
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{
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bp_location *loc = this;
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loc->owner = owner;
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loc->cond_bytecode = NULL;
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loc->shlib_disabled = 0;
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loc->enabled = 1;
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switch (owner->type)
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switch (type)
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{
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case bp_breakpoint:
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case bp_single_step:
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@ -6972,30 +6962,44 @@ bp_location::bp_location (breakpoint *owner)
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case bp_gnu_ifunc_resolver:
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case bp_gnu_ifunc_resolver_return:
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case bp_dprintf:
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loc->loc_type = bp_loc_software_breakpoint;
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mark_breakpoint_location_modified (loc);
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break;
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return bp_loc_software_breakpoint;
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case bp_hardware_breakpoint:
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loc->loc_type = bp_loc_hardware_breakpoint;
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mark_breakpoint_location_modified (loc);
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break;
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return bp_loc_hardware_breakpoint;
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case bp_hardware_watchpoint:
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case bp_read_watchpoint:
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case bp_access_watchpoint:
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loc->loc_type = bp_loc_hardware_watchpoint;
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break;
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return bp_loc_hardware_watchpoint;
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case bp_watchpoint:
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case bp_catchpoint:
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case bp_tracepoint:
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case bp_fast_tracepoint:
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case bp_static_tracepoint:
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loc->loc_type = bp_loc_other;
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break;
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return bp_loc_other;
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default:
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internal_error (__FILE__, __LINE__, _("unknown breakpoint type"));
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}
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}
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loc->refc = 1;
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bp_location::bp_location (breakpoint *owner, bp_loc_type type)
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{
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this->owner = owner;
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this->cond_bytecode = NULL;
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this->shlib_disabled = 0;
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this->enabled = 1;
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this->loc_type = type;
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if (this->loc_type == bp_loc_software_breakpoint
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|| this->loc_type == bp_loc_hardware_breakpoint)
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mark_breakpoint_location_modified (this);
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this->refc = 1;
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}
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bp_location::bp_location (breakpoint *owner)
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: bp_location::bp_location (owner,
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bp_location_from_bp_type (owner->type))
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{
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}
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/* Allocate a struct bp_location. */
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@ -8639,11 +8643,12 @@ bp_loc_is_permanent (struct bp_location *loc)
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{
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gdb_assert (loc != NULL);
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/* If we have a catchpoint or a watchpoint, just return 0. We should not
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attempt to read from the addresses the locations of these breakpoint types
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point to. program_breakpoint_here_p, below, will attempt to read
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/* If we have a non-breakpoint-backed catchpoint or a software
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watchpoint, just return 0. We should not attempt to read from
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the addresses the locations of these breakpoint types point to.
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program_breakpoint_here_p, below, will attempt to read
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memory. */
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if (!breakpoint_address_is_meaningful (loc->owner))
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if (!bl_address_is_meaningful (loc))
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return 0;
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scoped_restore_current_pspace_and_thread restore_pspace_thread;
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@ -11451,10 +11456,9 @@ breakpoint_auto_delete (bpstat bs)
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/* A comparison function for bp_location AP and BP being interfaced to
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qsort. Sort elements primarily by their ADDRESS (no matter what
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does breakpoint_address_is_meaningful say for its OWNER),
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secondarily by ordering first permanent elements and
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terciarily just ensuring the array is sorted stable way despite
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qsort being an unstable algorithm. */
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bl_address_is_meaningful says), secondarily by ordering first
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permanent elements and terciarily just ensuring the array is sorted
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stable way despite qsort being an unstable algorithm. */
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static int
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bp_locations_compare (const void *ap, const void *bp)
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@ -11794,7 +11798,7 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
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this one from the target. */
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/* OLD_LOC comes from existing struct breakpoint. */
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if (breakpoint_address_is_meaningful (old_loc->owner))
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if (bl_address_is_meaningful (old_loc))
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{
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for (loc2p = locp;
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(loc2p < bp_locations + bp_locations_count
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@ -11934,7 +11938,7 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
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b = loc->owner;
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if (!unduplicated_should_be_inserted (loc)
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|| !breakpoint_address_is_meaningful (b)
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|| !bl_address_is_meaningful (loc)
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/* Don't detect duplicate for tracepoint locations because they are
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never duplicated. See the comments in field `duplicate' of
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`struct bp_location'. */
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@ -316,7 +316,12 @@ class bp_location
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public:
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bp_location () = default;
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bp_location (breakpoint *owner);
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/* Construct a bp_location with the type inferred from OWNER's
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type. */
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explicit bp_location (breakpoint *owner);
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/* Construct a bp_location with type TYPE. */
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bp_location (breakpoint *owner, bp_loc_type type);
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virtual ~bp_location ();
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@ -1,3 +1,9 @@
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2019-07-09 Pedro Alves <palves@redhat.com>
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* gdb.texinfo (C++ Exception GDB/MI Catchpoint Commands): Adjust
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examples to show type=catchpoint instead of type=breakpoint and an
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address.
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2019-07-03 Pedro Alves <palves@redhat.com>
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Philippe Waroquiers <philippe.waroquiers@skynet.be>
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@ -30120,9 +30120,9 @@ and @samp{tcatch throw} (@pxref{Set Catchpoints}).
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@smallexample
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-catch-throw -r exception_type
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^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
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addr="0x00000000004006c0",what="exception throw",
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catch-type="throw",thread-groups=["i1"],
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^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
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what="exception throw",catch-type="throw",
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thread-groups=["i1"],
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regexp="exception_type",times="0"@}
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(gdb)
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-exec-run
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@ -30164,9 +30164,9 @@ and @samp{tcatch rethrow} (@pxref{Set Catchpoints}).
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@smallexample
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-catch-rethrow -r exception_type
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^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
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addr="0x00000000004006c0",what="exception rethrow",
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catch-type="rethrow",thread-groups=["i1"],
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^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
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what="exception rethrow",catch-type="rethrow",
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thread-groups=["i1"],
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regexp="exception_type",times="0"@}
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(gdb)
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-exec-run
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@ -30208,9 +30208,9 @@ and @samp{tcatch catch} (@pxref{Set Catchpoints}).
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@smallexample
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-catch-catch -r exception_type
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^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
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addr="0x00000000004006c0",what="exception catch",
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catch-type="catch",thread-groups=["i1"],
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^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
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what="exception catch",catch-type="catch",
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thread-groups=["i1"],
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regexp="exception_type",times="0"@}
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(gdb)
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-exec-run
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@ -379,7 +379,6 @@ bppy_set_hit_count (PyObject *self, PyObject *newvalue, void *closure)
|
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static PyObject *
|
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bppy_get_location (PyObject *self, void *closure)
|
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{
|
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const char *str;
|
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gdbpy_breakpoint_object *obj = (gdbpy_breakpoint_object *) self;
|
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BPPY_REQUIRE_VALID (obj);
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@ -387,12 +386,7 @@ bppy_get_location (PyObject *self, void *closure)
|
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if (obj->bp->type != bp_breakpoint)
|
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Py_RETURN_NONE;
|
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|
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struct event_location *location = obj->bp->location.get ();
|
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/* "catch throw" makes a breakpoint of type bp_breakpoint that does
|
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not have a location. */
|
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if (location == nullptr)
|
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Py_RETURN_NONE;
|
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str = event_location_to_string (location);
|
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const char *str = event_location_to_string (obj->bp->location.get ());
|
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if (! str)
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||||
str = "";
|
||||
return host_string_to_python_string (str).release ();
|
||||
|
||||
@ -1,3 +1,13 @@
|
||||
2019-07-09 Pedro Alves <palves@redhat.com>
|
||||
|
||||
* gdb.cp/catch-multi-stdlib.exp: Adjust expected "info
|
||||
breakpoints" output.
|
||||
* gdb.cp/exception.exp: Adjust expected "info breakpoints" output.
|
||||
* gdb.python/py-breakpoint.exp: No longer expect that "catch
|
||||
throw" creates breakpoint.
|
||||
* gdb.mi/mi-catch-cpp-exceptions.exp (setup_catchpoint): Expect
|
||||
'type="catchpoint"'.
|
||||
|
||||
2019-07-09 Pedro Alves <palves@redhat.com>
|
||||
|
||||
PR c++/15468
|
||||
|
||||
@ -74,9 +74,9 @@ proc test_multi_libstdcpp {static_bin static_lib} {
|
||||
set ws "\[ \t\]*"
|
||||
gdb_test "info breakpoints" \
|
||||
[multi_line \
|
||||
"${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception catch" \
|
||||
"${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception throw" \
|
||||
"${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception rethrow"]
|
||||
"${decimal}${ws}catchpoint${ws}keep${ws}y${ws}exception catch" \
|
||||
"${decimal}${ws}catchpoint${ws}keep${ws}y${ws}exception throw" \
|
||||
"${decimal}${ws}catchpoint${ws}keep${ws}y${ws}exception rethrow"]
|
||||
}
|
||||
|
||||
# Try different static/not-static combinations.
|
||||
|
||||
@ -62,16 +62,10 @@ gdb_test "catch rethrow" "Catchpoint \[0-9\]+ \\(rethrow\\)" \
|
||||
"catch rethrow (before inferior run)"
|
||||
|
||||
|
||||
# The catchpoints should be listed in the list of breakpoints.
|
||||
# In case of a statically linked test, we won't have a pending breakpoint.
|
||||
# Hence we allow for both an address or "<PENDING>". If we ever become able
|
||||
# to tell whether the target is linked statically or not, we can be more
|
||||
# precise and require exact output.
|
||||
set addr "\(<PENDING>|$hex\)"
|
||||
set re_head "Num${ws}Type${ws}Disp${ws}Enb${ws}Address${ws}What"
|
||||
set re_2_bp "1${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception catch"
|
||||
set re_3_bp "2${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception throw"
|
||||
set re_4_bp "3${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception rethrow"
|
||||
set re_2_bp "1${ws}catchpoint${ws}keep${ws}y${ws}exception catch"
|
||||
set re_3_bp "2${ws}catchpoint${ws}keep${ws}y${ws}exception throw"
|
||||
set re_4_bp "3${ws}catchpoint${ws}keep${ws}y${ws}exception rethrow"
|
||||
|
||||
set name "info breakpoints (before inferior run)"
|
||||
gdb_test_multiple "info breakpoints" $name {
|
||||
@ -100,12 +94,6 @@ if { !$ok } {
|
||||
continue
|
||||
}
|
||||
|
||||
set addr "$hex"
|
||||
set re_head "Num${ws}Type${ws}Disp${ws}Enb${ws}Address${ws}What"
|
||||
set re_2_bp "1${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception catch"
|
||||
set re_3_bp "2${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception throw"
|
||||
set re_4_bp "3${ws}breakpoint${ws}keep${ws}y${ws}$addr${ws}exception rethrow"
|
||||
|
||||
set name "info breakpoints (after inferior run)"
|
||||
gdb_test_multiple "info breakpoints" $name {
|
||||
-re "$re_head${ws}$re_2_bp${ws}$re_3_bp${ws}$re_4_bp\r\n$gdb_prompt $" {
|
||||
|
||||
@ -85,7 +85,7 @@ proc continue_to_breakpoint_in_main {} {
|
||||
proc setup_catchpoint {type {extra ""}} {
|
||||
global decimal
|
||||
mi_gdb_test "-catch-${type} ${extra}" \
|
||||
"\\^done,bkpt=\{number=\"$decimal\".*what=\"exception ${type}\",catch-type=\"${type}\".*\}" \
|
||||
"\\^done,bkpt=\{number=\"$decimal\",type=\"catchpoint\".*what=\"exception ${type}\",catch-type=\"${type}\".*\}" \
|
||||
"Setup -catch-${type}"
|
||||
}
|
||||
|
||||
|
||||
@ -619,8 +619,9 @@ proc_with_prefix test_bkpt_explicit_loc {} {
|
||||
|
||||
delete_breakpoints
|
||||
gdb_test "catch throw" "Catchpoint .* \\(throw\\)"
|
||||
gdb_test "python print (gdb.breakpoints()\[0\].location)" None \
|
||||
"Examine location of catchpoint"
|
||||
gdb_test "python print (gdb.breakpoints())" \
|
||||
"\(\)" \
|
||||
"catch throw is not a breakpoint"
|
||||
}
|
||||
|
||||
proc_with_prefix test_bkpt_qualified {} {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user