Refactor dmprof: Split dmprof.py into modules.

tools/deep_memory_profiler/lib/exception.py

+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+class EmptyDumpException(Exception):
+  def __init__(self, value=''):
+    super(EmptyDumpException, self).__init__()
+    self.value = value
+  def __str__(self):
+    return repr(self.value)
+
+
+class ParsingException(Exception):
+  def __init__(self, value=''):
+    super(ParsingException, self).__init__()
+    self.value = value
+  def __str__(self):
+    return repr(self.value)
+
+
+class InvalidDumpException(ParsingException):
+  def __init__(self, value):
+    super(InvalidDumpException, self).__init__()
+    self.value = value
+  def __str__(self):
+    return "invalid heap profile dump: %s" % repr(self.value)
+
+
+class ObsoleteDumpVersionException(ParsingException):
+  def __init__(self, value):
+    super(ObsoleteDumpVersionException, self).__init__()
+    self.value = value
+  def __str__(self):
+    return "obsolete heap profile dump version: %s" % repr(self.value)