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authorTom Tromey <tromey@redhat.com>2013-02-28 19:28:25 +0000
committerTom Tromey <tromey@redhat.com>2013-02-28 19:28:25 +0000
commitc4a9e8b4e322868fd065dcbe70232cc25eedb6c2 (patch)
treed248a3b2d751850f9fa9d19110d4d3dabf6d9e0a /gdb/contrib/exsummary.py
parent7f6a5dde442f1c824c4a559c3a3e819d80d91586 (diff)
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* contrib/excheck.py: New file.
* contrib/exsummary.py: New file. * contrib/gcc-with-excheck: New file.
Diffstat (limited to 'gdb/contrib/exsummary.py')
-rw-r--r--gdb/contrib/exsummary.py185
1 files changed, 185 insertions, 0 deletions
diff --git a/gdb/contrib/exsummary.py b/gdb/contrib/exsummary.py
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+# 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)