Introduce gdb.FinishBreakpoint in Python

* Makefile.in (SUBDIR_PYTHON_OBS): Add py-finishbreakpoint.o.
	(SUBDIR_PYTHON_SRCS): Add python/py-finishbreakpoint.c.
	Add build rule for this file.
	* infcmd.c (print_return_value): Split to create get_return_value.
	(get_return_value): New function based on print_return_value. Handle
	case where stop_registers are not set.
	* inferior.h (get_return_value): New prototype.
	* python/py-breakpoint.c (bppy_pending_object): Make non-static.
	(gdbpy_breakpoint_created): Set is_py_finish_bp is necessary.
	(struct breakpoint_object): Move to python-internal.h
	(BPPY_REQUIRE_VALID): Likewise.
	(BPPY_SET_REQUIRE_VALID): Likewise.
	(gdbpy_breakpoint_created): Initialize is_finish_bp.
	(gdbpy_should_stop): Add  pre/post hooks before/after calling stop
	method.
	* python/python-internal.h (breakpoint_object_type): Add as extern.
	(bppy_pending_object): Likewise.
	(typedef struct breakpoint_object) Removed.
	(struct breakpoint_object): Moved from py-breakpoint.c.
	Add field is_finish_bp.
	(BPPY_REQUIRE_VALID): Moved from py-breakpoint.c.
	(BPPY_SET_REQUIRE_VALID): Likewise.
	(frame_object_to_frame_info): New prototype.
	(gdbpy_initialize_finishbreakpoints): New prototype.
	(bpfinishpy_is_finish_bp): Likewise.
	(bpfinishpy_pre_stop_hook): Likewise.
	(bpfinishpy_post_stop_hook): Likewise.
	* python/py-finishbreakpoint.c: New file.
	* python/py-frame.c(frame_object_to_frame_info): Make non-static and
	accept PyObject instead of frame_object.
	(frapy_is_valid): Don't cast to frame_object.
	(frapy_name): Likewise.
	(frapy_type): Likewise.
	(frapy_unwind_stop_reason): Likewise.
	(frapy_pc): Likewise.
	(frapy_block): Likewise.
	(frapy_function): Likewise.
	(frapy_older): Likewise.
	(frapy_newer): Likewise.
	(frapy_find_sal): Likewise.
	(frapy_read_var): Likewise.
	(frapy_select): Likewise.
	* python/python.c (gdbpy_is_stopped_at_finish_bp): New noop function.
	(_initialize_python): Add gdbpy_initialize_finishbreakpoints.
	* python/python.h: Include breakpoint.h
	(gdbpy_is_stopped_at_finish_bp): New prototype.

doc/
	* gdb.texinfo (Finish Breakpoints in Python): New subsection.
	(Python API): Add menu entry for Finish Breakpoints.

testsuite/
	* Makefile.in (EXECUTABLES): Add py-finish-breakpoint and
	py-finish-breakpoint2
	(MISCALLANEOUS): Add py-events-shlib.so and py-events-shlib-nodebug.so
	* gdb.python/py-breakpoint.exp (mult_line): Define and use variable
	instead of line number.
	* gdb.python/py-finish-breakpoint.c: New file.
	* gdb.python/py-finish-breakpoint.exp: New file.
	* gdb.python/py-finish-breakpoint.py: New file.
	* gdb.python/py-finish-breakpoint2.cc: New file.
	* gdb.python/py-finish-breakpoint2.exp: New file.
	* gdb.python/py-finish-breakpoint2.py: New file.

gdb/testsuite/gdb.python/py-finish-breakpoint.py

@@ -0,0 +1,89 @@
+# Copyright (C) 2011 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is part of the GDB testsuite.  It tests python Finish
+# Breakpoints.
+		
+class MyFinishBreakpoint (gdb.FinishBreakpoint):
+	def __init__(self, val, frame):
+		gdb.FinishBreakpoint.__init__ (self, frame)
+		print "MyFinishBreakpoint init"
+		self.val = val
+		
+	def stop(self):
+		print "MyFinishBreakpoint stop with %d" % int (self.val.dereference ())
+		print "return_value is: %d" % int (self.return_value)
+		gdb.execute ("where 1")
+		return True
+	
+	def out_of_scope(self):
+		print "MyFinishBreakpoint out of scope"
+
+class TestBreakpoint(gdb.Breakpoint):
+    def __init__(self):
+        gdb.Breakpoint.__init__ (self, spec="test_1", internal=1)
+        self.silent = True
+        self.count = 0
+        print "TestBreakpoint init"
+        
+    def stop(self):
+    	self.count += 1
+    	try:
+        	TestFinishBreakpoint (gdb.newest_frame (), self.count)
+        except ValueError as e:
+        	print e
+        return False
+
+class TestFinishBreakpoint (gdb.FinishBreakpoint):
+    def __init__ (self, frame, count):
+    	self.count = count
+        gdb.FinishBreakpoint.__init__ (self, frame, internal=1)
+        
+        
+    def stop(self):
+        print "-->", self.number
+        if (self.count == 3):
+            print "test stop: %d" % self.count
+            return True
+        else:
+            print "test don't stop: %d" % self.count
+            return False 
+        
+    
+    def out_of_scope(self):
+        print "test didn't finish: %d" % self.count
+
+class TestExplicitBreakpoint(gdb.Breakpoint):
+	def stop(self):
+		try:
+			SimpleFinishBreakpoint (gdb.newest_frame ())
+		except ValueError as e:
+			print e
+		return False
+
+class SimpleFinishBreakpoint(gdb.FinishBreakpoint):
+	def __init__(self, frame):
+		gdb.FinishBreakpoint.__init__ (self, frame)
+		
+		print "SimpleFinishBreakpoint init"
+		
+	def stop(self):
+		print "SimpleFinishBreakpoint stop" 
+		return True
+	
+	def out_of_scope(self):
+		print "SimpleFinishBreakpoint out of scope"
+
+print "Python script importedd"