[GitHub] [incubator-tvm] jroesch commented on a change in pull request #6162: [Parser] Parser 2.0 part 2

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

jroesch commented on a change in pull request #6162:
URL: https://github.com/apache/incubator-tvm/pull/6162#discussion_r461947492



##########
File path: src/parser/meta_ref.cc
##########
@@ -0,0 +1,105 @@
+/*
+ * 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/parser/meta_ref.cc
+ * \brief An operator which allows forward referencing a yet-to-be parsed meta table reference.
+ */
+
+#include <tvm/relay/op.h>
+#include <tvm/relay/expr_functor.h>
+#include <tvm/relay/transform.h>
+#include <tvm/relay/op_attr_types.h>
+#include <topi/elemwise.h>
+
+#include "./meta_ref.h"
+
+namespace tvm {
+namespace parser {
+
+using tvm::transform::PassContext;
+using tvm::relay::transform::CreateFunctionPass;
+
+TVM_REGISTER_NODE_TYPE(MetaRefAttrs);
+
+bool MetaRefRel(const Array<Type>& types, int num_inputs, const Attrs& attrs,
+                     const TypeReporter& reporter) {
+    LOG(FATAL) << "need to expand before type checking";
+    return true;
+}
+
+RELAY_REGISTER_OP("parser.MetaRef")
+    .describe(R"code(A reference into the meta table.)code" TVM_ADD_FILELINE)
+    .set_attrs_type<MetaRefAttrs>()
+    .set_num_inputs(0)
+    .set_support_level(10)
+    .add_type_rel("MetaRef", MetaRefRel)
+    .set_attr<TOpIsStateful>("TOpIsStateful", false)
+    .set_attr<TNonComputational>("TNonComputational", true);
+
+Expr MetaRef(std::string type_key, uint64_t node_index) {
+    static const Op& op = Op::Get("parser.MetaRef");
+    auto attrs = make_object<MetaRefAttrs>();
+    attrs->node_type_key = tvm::String(type_key);
+    attrs->node_index = node_index;
+    return Call(op, {}, Attrs(attrs), {});
+}
+
+
+// class MetaRefAttrExpander : AttrFunctor<ObjectRef(const ObjectRef& n)> {

Review comment:
       It is still draft, I will do the final clean up once the design is finalized. 




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