tqchen commented on a change in pull request #5717:
URL: https://github.com/apache/incubator-tvm/pull/5717#discussion_r434639667



##########
File path: src/relay/backend/compile_engine.cc
##########
@@ -689,7 +689,7 @@ class CompileEngineImpl : public CompileEngineNode {
       cache_node->funcs = (*f)(cfunc->schedule, all_args, 
cache_node->func_name, key->source_func);
     } else {
       using tvm::transform::PassContext;
-      With<PassContext> fresh_pass_ctx_scope(PassContext::Create());
+      With<PassContext> 
fresh_pass_ctx_scope(static_cast<PassContext>(PassContext()));

Review comment:
       I don't think static cast would be necessary here, With<PassContext> 
fresh_pass_ctx_scope(PassContext()); should suffice once we defined the copy 
constructor

##########
File path: include/tvm/ir/transform.h
##########
@@ -161,7 +161,7 @@ class PassContextNode : public Object {
  */
 class PassContext : public ObjectRef {
  public:
-  PassContext() {}
+  PassContext() : PassContext(make_object<PassContextNode>()) {}

Review comment:
       use 
https://github.com/apache/incubator-tvm/blob/master/include/tvm/runtime/object.h#L712
 and add  `PassContextNode* operator->()`; you will need copy constructor and 
other things now that default constructor is defined in a different way.




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