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27.9.3 C++ Exception GDB/MI Catchpoints

The following GDB/MI commands can be used to create catchpoints that stop the execution when C++ exceptions are being throw, rethrown, or caught.

The -catch-throw Command

Synopsis

 -catch-throw [ -t ] [ -r regexp]

Stop when the debuggee throws a C++ exception. If regexp is given, then only exceptions whose type matches the regular expression will be caught.

If ‘-t’ is given, then the catchpoint is enabled only for one stop, the catchpoint is automatically deleted after stopping once for the event.

GDB Command

The corresponding GDB commands are ‘catch throw’ and ‘tcatch throw’ (see Set Catchpoints).

Example

-catch-throw -r exception_type
^done,bkpt={number="1",type="catchpoint",disp="keep",enabled="y",
  what="exception throw",catch-type="throw",
  thread-groups=["i1"],
  regexp="exception_type",times="0"}
(gdb)
-exec-run
^running
(gdb)
~"\n"
~"Catchpoint 1 (exception thrown), 0x00007ffff7ae00ed
  in __cxa_throw () from /lib64/libstdc++.so.6\n"
*stopped,bkptno="1",reason="breakpoint-hit",disp="keep",
  frame={addr="0x00007ffff7ae00ed",func="__cxa_throw",
  args=[],from="/lib64/libstdc++.so.6",arch="i386:x86-64"},
  thread-id="1",stopped-threads="all",core="6"
(gdb)

The -catch-rethrow Command

Synopsis

 -catch-rethrow [ -t ] [ -r regexp]

Stop when a C++ exception is re-thrown. If regexp is given, then only exceptions whose type matches the regular expression will be caught.

If ‘-t’ is given, then the catchpoint is enabled only for one stop, the catchpoint is automatically deleted after the first event is caught.

GDB Command

The corresponding GDB commands are ‘catch rethrow’ and ‘tcatch rethrow’ (see Set Catchpoints).

Example

-catch-rethrow -r exception_type
^done,bkpt={number="1",type="catchpoint",disp="keep",enabled="y",
  what="exception rethrow",catch-type="rethrow",
  thread-groups=["i1"],
  regexp="exception_type",times="0"}
(gdb)
-exec-run
^running
(gdb)
~"\n"
~"Catchpoint 1 (exception rethrown), 0x00007ffff7ae00ed
  in __cxa_rethrow () from /lib64/libstdc++.so.6\n"
*stopped,bkptno="1",reason="breakpoint-hit",disp="keep",
  frame={addr="0x00007ffff7ae00ed",func="__cxa_rethrow",
  args=[],from="/lib64/libstdc++.so.6",arch="i386:x86-64"},
  thread-id="1",stopped-threads="all",core="6"
(gdb)

The -catch-catch Command

Synopsis

 -catch-catch [ -t ] [ -r regexp]

Stop when the debuggee catches a C++ exception. If regexp is given, then only exceptions whose type matches the regular expression will be caught.

If ‘-t’ is given, then the catchpoint is enabled only for one stop, the catchpoint is automatically deleted after the first event is caught.

GDB Command

The corresponding GDB commands are ‘catch catch’ and ‘tcatch catch’ (see Set Catchpoints).

Example

-catch-catch -r exception_type
^done,bkpt={number="1",type="catchpoint",disp="keep",enabled="y",
  what="exception catch",catch-type="catch",
  thread-groups=["i1"],
  regexp="exception_type",times="0"}
(gdb)
-exec-run
^running
(gdb)
~"\n"
~"Catchpoint 1 (exception caught), 0x00007ffff7ae00ed
  in __cxa_begin_catch () from /lib64/libstdc++.so.6\n"
*stopped,bkptno="1",reason="breakpoint-hit",disp="keep",
  frame={addr="0x00007ffff7ae00ed",func="__cxa_begin_catch",
  args=[],from="/lib64/libstdc++.so.6",arch="i386:x86-64"},
  thread-id="1",stopped-threads="all",core="6"
(gdb)

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