[GitHub] [incubator-tvm] masahi commented on a change in pull request #5231: [POC] Pattern Language, Matcher, and Rewriter V0

[GitBox <gi...@apache.org>]

masahi commented on a change in pull request #5231: [POC] Pattern Language, Matcher, and Rewriter V0
URL: https://github.com/apache/incubator-tvm/pull/5231#discussion_r408455537
 
 

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 File path: src/relay/ir/dataflow_matcher.cc
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 @@ -0,0 +1,382 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+/*!
+ * \file src/tvm/relay/dataflow_matcher.cc
+ * \brief The dataflow pattern matcher for Relay.
+ */
+
+#include <tvm/relay/analysis.h>
+#include <tvm/relay/dataflow_matcher.h>
+#include <tvm/relay/expr_functor.h>
+#include <tvm/relay/transform.h>
+
+namespace tvm {
+namespace relay {
+
+// Pattern Matcher
+
+class DFPatternMatcher : public DFPatternFunctor<bool(const DFPattern&, const Expr&)> {
+ public:
+  bool Match(const DFPattern& pattern, const Expr& expr);
+
+ protected:
+  bool VisitDFPattern(const DFPattern& pattern, const Expr& expr) override;
+  bool VisitDFPattern_(const AltPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const AttrPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const CallPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const DominatorPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const ExprPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const TupleGetItemPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const TuplePatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const TypePatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const VarPatternNode* op, const Expr& expr) override;
+  bool VisitDFPattern_(const WildcardPatternNode* op, const Expr& expr) override;
+
+  void ClearMap(size_t watermark);
+  std::unordered_map<DFPattern, Expr, ObjectHash, ObjectEqual> memo_;
+  std::vector<DFPattern> matched_nodes_;
+};
+
+bool DFPatternMatcher::Match(const DFPattern& pattern, const Expr& expr) {
+  memo_.clear();
+  matched_nodes_.clear();
+  return VisitDFPattern(pattern, expr);
+}
+
+void DFPatternMatcher::ClearMap(size_t watermark) {
+  for (size_t i = watermark; i < matched_nodes_.size(); ++i) {
+    memo_.erase(matched_nodes_[i]);
+  }
+  matched_nodes_.erase(matched_nodes_.begin() + watermark, matched_nodes_.end());
+}
+bool DFPatternMatcher::VisitDFPattern(const DFPattern& pattern, const Expr& expr) {
 
 Review comment:
   needs new line

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