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+# Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Wraps function bodies with a try/except to rewrite error tracebacks.
+
+Only adds try/except wrappers to functions that have the anno.Basic.ORIGIN
+annotation because these are the functions originally written by the user.
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from tensorflow.contrib.autograph.core import converter
+from tensorflow.contrib.autograph.pyct import anno
+from tensorflow.contrib.autograph.pyct import templates
+
+
+class ErrorRewritingTransformer(converter.Base):
+ """Possibly wraps the body of a function in a try/except.
+
+ Only wraps functions that were originally defined by the user, detected by
+ checking for the anno.Basic.ORIGIN annotation.
+ """
+
+ def visit_FunctionDef(self, node):
+ node = self.generic_visit(node)
+
+ if anno.hasanno(node, anno.Basic.ORIGIN):
+ template = """
+ try:
+ body
+ except:
+ ag__.rewrite_graph_construction_error(ag_source_map__)
+ """
+ node.body = templates.replace(template, body=node.body)
+ return node
+
+
+def transform(node, ctx):
+ return ErrorRewritingTransformer(ctx).visit(node)