#### 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 Setting 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 Setting 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 Setting 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)