* contrib/excheck.py: New file.

* contrib/exsummary.py: New file.
	* contrib/gcc-with-excheck: New file.

gdb/contrib/exsummary.py

@@ -0,0 +1,185 @@
+#   Copyright 2011, 2013 Free Software Foundation, Inc.
+#
+#   This 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/>.
+
+import sys
+import glob
+
+# Compute the summary information from the files created by
+# excheck.py.  Run in the build directory where you used the
+# excheck.py plugin.
+
+class Function:
+    def __init__(self, name):
+        self.name = name
+        self.location = None
+        self.callers = []
+        self.can_throw = False
+        self.marked_nothrow = False
+        self.reason = None
+
+    def log(self, message):
+        print "%s: note: %s" % (self.location, message)
+
+    def set_location(self, location):
+        self.location = location
+
+    # CALLER is an Edge.
+    def add_caller(self, caller):
+        # self.log("adding call from %s" % caller.from_fn.name)
+        self.callers.append(caller)
+        # self.log("len = %d" % len(self.callers))
+
+    def consistency_check(self):
+        if self.marked_nothrow and self.can_throw:
+            print ("%s: error: %s marked as both 'throw' and 'nothrow'"
+                   % (self.location, self.name))
+
+    def declare_nothrow(self):
+        self.marked_nothrow = True
+        self.consistency_check()
+
+    def declare_throw(self):
+        result = not self.can_throw # Return True the first time
+        self.can_throw = True
+        self.consistency_check()
+        return result
+
+    def print_stack(self, is_indirect):
+        if is_indirect:
+            print ("%s: error: function %s is marked nothrow but is assumed to throw due to indirect call"
+                   % (self.location, self.name))
+        else:
+            print ("%s: error: function %s is marked nothrow but can throw"
+                   % (self.location, self.name))
+
+        edge = self.reason
+        while edge is not None:
+            print ("%s: info: via call to %s"
+                   % (edge.location, edge.to_fn.name))
+            edge = edge.to_fn.reason
+
+    def mark_throw(self, edge, work_list, is_indirect):
+        if not self.can_throw:
+            # self.log("can throw")
+            self.can_throw = True
+            self.reason = edge
+            if self.marked_nothrow:
+                self.print_stack(is_indirect)
+            else:
+                # Do this in the 'else' to avoid extra error
+                # propagation.
+                work_list.append(self)
+
+class Edge:
+    def __init__(self, from_fn, to_fn, location):
+        self.from_fn = from_fn
+        self.to_fn = to_fn
+        self.location = location
+
+# Work list of known-throwing functions.
+work_list = []
+# Map from function name to Function object.
+function_map = {}
+# Work list of indirect calls.
+indirect_functions = []
+# Whether we should process cleanup functions as well.
+process_cleanups = False
+# Whether we should process indirect function calls.
+process_indirect = False
+
+def declare(fn_name):
+    global function_map
+    if fn_name not in function_map:
+        function_map[fn_name] = Function(fn_name)
+    return function_map[fn_name]
+
+def define_function(fn_name, location):
+    fn = declare(fn_name)
+    fn.set_location(location)
+
+def declare_throw(fn_name):
+    global work_list
+    fn = declare(fn_name)
+    if fn.declare_throw():
+        work_list.append(fn)
+
+def declare_nothrow(fn_name):
+    fn = declare(fn_name)
+    fn.declare_nothrow()
+
+def declare_cleanup(fn_name):
+    global process_cleanups
+    fn = declare(fn_name)
+    if process_cleanups:
+        fn.declare_nothrow()
+
+def function_call(to, frm, location):
+    to_fn = declare(to)
+    frm_fn = declare(frm)
+    to_fn.add_caller(Edge(frm_fn, to_fn, location))
+
+def has_indirect_call(fn_name, location):
+    global indirect_functions
+    fn = declare(fn_name)
+    phony = Function("<indirect call>")
+    phony.add_caller(Edge(fn, phony, location))
+    indirect_functions.append(phony)
+
+def mark_functions(worklist, is_indirect):
+    for callee in worklist:
+        for edge in callee.callers:
+            edge.from_fn.mark_throw(edge, worklist, is_indirect)
+
+def help_and_exit():
+    print "Usage: exsummary [OPTION]..."
+    print ""
+    print "Read the .py files from the exception checker plugin and"
+    print "generate an error summary."
+    print ""
+    print "  --cleanups     Include invalid behavior in cleanups"
+    print "  --indirect     Include assumed errors due to indirect function calls"
+    sys.exit(0)
+
+def main():
+    global work_list
+    global indirect_functions
+    global process_cleanups
+    global process_indirect
+
+    for arg in sys.argv:
+        if arg == '--cleanups':
+            process_cleanups = True
+        elif arg == '--indirect':
+            process_indirect = True
+        elif arg == '--help':
+            help_and_exit()
+
+    for fname in sorted(glob.glob('*.c.gdb_exc.py')):
+        execfile(fname)
+    print "================"
+    print "= Ordinary marking"
+    print "================"
+    mark_functions(work_list, False)
+    if process_indirect:
+        print "================"
+        print "= Indirect marking"
+        print "================"
+        mark_functions(indirect_functions, True)
+    return 0
+
+if __name__ == '__main__':
+    status = main()
+    sys.exit(status)