gdb/python: allow for catchpoint type breakpoints in python

This commit adds initial support for catchpoints to the python
breakpoint API.

This commit adds a BP_CATCHPOINT constant which corresponds to
GDB's internal bp_catchpoint.  The new constant is documented in the
manual.

The user can't create breakpoints with type BP_CATCHPOINT after this
commit, but breakpoints that already exist, obtained with the
`gdb.breakpoints` function, can now have this type.  Additionally,
when a stop event is reported for hitting a catchpoint, GDB will now
report a BreakpointEvent with the attached breakpoint being of type
BP_CATCHPOINT - previously GDB would report a generic StopEvent in
this situation.

gdb/ChangeLog:

	* NEWS: Mention Python BP_CATCHPOINT feature.
	* python/py-breakpoint.c (pybp_codes): Add bp_catchpoint support.
	(bppy_init): Likewise.
	(gdbpy_breakpoint_created): Likewise.

gdb/doc/ChangeLog:

	* python.texinfo (Breakpoints In Python): Add BP_CATCHPOINT
	description.

gdb/testsuite/ChangeLog:

	* gdb.python/py-breakpoint.c (do_throw): New function.
	(main): Call do_throw.
	* gdb.python/py-breakpoint.exp (test_catchpoints): New proc.

1 files changed, 4 insertions, 0 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index 151c4f1..aae3b49 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -231,6 +231,10 @@ QMemTags
   ** New method gdb.PendingFrame.level() which returns the stack level
      of the frame object.
 
+  ** When hitting a catchpoint, the Python API will now emit a
+     gdb.BreakpointEvent rather than a gdb.StopEvent.  The
+     gdb.Breakpoint attached to the event will have type BP_CATCHPOINT.
+
 *** Changes in GDB 10
 
 * There are new feature names for ARC targets: "org.gnu.gdb.arc.core"