Implement canonical name scheme in kernel.

runtime/vm/kernel.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/kernel.h"
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 namespace dart {
 
 namespace kernel {
 
 
 template <typename T>
 void VisitList(List<T>* list, Visitor* visitor) {
   for (int i = 0; i < list->length(); ++i) {
     (*list)[i]->AcceptVisitor(visitor);
   }
 }
 
 
+CanonicalName::CanonicalName() : is_referenced_(false) {}
+
+
+CanonicalName* CanonicalName::NewRoot() {
+  return new CanonicalName();
+}
+
+
+void CanonicalName::LinkTo(LinkedNode* new_target) {
+  ASSERT(new_target != NULL);
+  if (definition_ == new_target) return;
+  ASSERT(definition_ == NULL);
+  ASSERT(new_target->canonical_name_ == NULL);
+  definition_ = new_target;
+  new_target->canonical_name_ = this;
+}
+
+
+void CanonicalName::Unlink() {
+  if (definition_ == NULL) return;
+  ASSERT(definition_->canonical_name_ == this);
+  definition_->canonical_name_ = NULL;
+  definition_ = NULL;
+}
+
+
+CanonicalName* CanonicalName::AddChild(String* name) {
+  CanonicalName* child = new CanonicalName();
+  child->parent_ = this;
+  child->name_ = name;
+  return child;
+}
+
+
+Library* CanonicalName::AsLibrary() {
+  return Library::Cast(definition());
+}
+
+
+Class* CanonicalName::AsClass() {
+  return Class::Cast(definition());
+}
+
+
+Member* CanonicalName::AsMember() {
+  return Member::Cast(definition());
+}
+
+
+Field* CanonicalName::AsField() {
+  return Field::Cast(definition());
+}
+
+
+Constructor* CanonicalName::AsConstructor() {
+  return Constructor::Cast(definition());
+}
+
+
+Procedure* CanonicalName::AsProcedure() {
+  return Procedure::Cast(definition());
+}
+
+
 Node::~Node() {}
 
 
 TreeNode::~TreeNode() {}
 
 
 void TreeNode::AcceptVisitor(Visitor* visitor) {
   AcceptTreeVisitor(visitor);
 }
 
 
+LinkedNode::~LinkedNode() {}
+
+
 Library::~Library() {}
 
 
 void Library::AcceptTreeVisitor(TreeVisitor* visitor) {
   visitor->VisitLibrary(this);
 }
 
 
 void Library::VisitChildren(Visitor* visitor) {
   VisitList(&classes(), visitor);
@@ skipping 1146 matching lines @@
 void Program::VisitChildren(Visitor* visitor) {
   VisitList(&libraries(), visitor);
   visitor->VisitProcedureReference(main_method());
 }
 
 
 }  // namespace kernel
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)