Implement type argument access and reification of runtime types.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

 // Copyright (c) 2014, 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.
 
 library tree_ir_nodes;
 
 import '../constants/expressions.dart';
 import '../constants/values.dart' as values;
-import '../dart_types.dart' show DartType, GenericType;
+import '../dart_types.dart' show DartType, GenericType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
 import '../universe/universe.dart';
 import '../universe/universe.dart' show Selector;
 import 'optimization/optimization.dart';
 
 // The Tree language is the target of translation out of the CPS-based IR.
 //
 // The translation from CPS to Dart consists of several stages.  Among the
 // stages are translation to direct style, translation out of SSA, eliminating
@@ skipping 231 matching lines @@
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitConstant(this, arg);
 
   values.ConstantValue get value => expression.value;
 }
 
 class This extends Expression {
   accept(ExpressionVisitor visitor) => visitor.visitThis(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitThis(this, arg);
 }
 
-class ReifyTypeVar extends Expression {
+class ReifyTypeVar extends Expression implements DartSpecificNode {
   TypeVariableElement typeVariable;
 
   ReifyTypeVar(this.typeVariable);
 
   accept(ExpressionVisitor visitor) => visitor.visitReifyTypeVar(this);
   accept1(ExpressionVisitor1 visitor, arg) {
     return visitor.visitReifyTypeVar(this, arg);
   }
 }
 
@@ skipping 476 matching lines @@
   Element field;
   Expression value;
   Statement next;
 
   SetField(this.object, this.field, this.value, this.next);
 
   accept(StatementVisitor visitor) => visitor.visitSetField(this);
   accept1(StatementVisitor1 visitor, arg) => visitor.visitSetField(this, arg);
 }
 
+class ReifyRuntimeType extends Expression implements JsSpecificNode {
+  Expression value;
+
+  ReifyRuntimeType(this.value);
+
+  accept(ExpressionVisitor visitor) {
+    return visitor.visitReifyRuntimeType(this);
+  }
+
+  accept1(ExpressionVisitor1 visitor, arg) {
+    return visitor.visitReifyRuntimeType(this, arg);
+  }
+}
+
+class ReadTypeVariable extends Expression implements JsSpecificNode {
+  final TypeVariableType variable;
+  Expression target;
+
+  ReadTypeVariable(this.variable, this.target);
+
+  accept(ExpressionVisitor visitor) {
+    return visitor.visitReadTypeVariable(this);
+  }
+
+  accept1(ExpressionVisitor1 visitor, arg) {
+    return visitor.visitReadTypeVariable(this, arg);
+  }
+}
+
 abstract class ExpressionVisitor<E> {
   E visitExpression(Expression e) => e.accept(this);
   E visitVariableUse(VariableUse node);
   E visitInvokeStatic(InvokeStatic node);
   E visitInvokeMethod(InvokeMethod node);
   E visitInvokeMethodDirectly(InvokeMethodDirectly node);
   E visitInvokeConstructor(InvokeConstructor node);
   E visitConcatenateStrings(ConcatenateStrings node);
   E visitConstant(Constant node);
   E visitThis(This node);
   E visitReifyTypeVar(ReifyTypeVar node);
   E visitConditional(Conditional node);
   E visitLogicalOperator(LogicalOperator node);
   E visitNot(Not node);
   E visitLiteralList(LiteralList node);
   E visitLiteralMap(LiteralMap node);
   E visitTypeOperator(TypeOperator node);
   E visitFunctionExpression(FunctionExpression node);
   E visitFieldInitializer(FieldInitializer node);
   E visitSuperInitializer(SuperInitializer node);
   E visitGetField(GetField node);
   E visitCreateBox(CreateBox node);
   E visitCreateInstance(CreateInstance node);
+  E visitReifyRuntimeType(ReifyRuntimeType node);
+  E visitReadTypeVariable(ReadTypeVariable node);
 }
 
 abstract class ExpressionVisitor1<E, A> {
   E visitExpression(Expression e, A arg) => e.accept1(this, arg);
   E visitVariableUse(VariableUse node, A arg);
   E visitInvokeStatic(InvokeStatic node, A arg);
   E visitInvokeMethod(InvokeMethod node, A arg);
   E visitInvokeMethodDirectly(InvokeMethodDirectly node, A arg);
   E visitInvokeConstructor(InvokeConstructor node, A arg);
   E visitConcatenateStrings(ConcatenateStrings node, A arg);
   E visitConstant(Constant node, A arg);
   E visitThis(This node, A arg);
   E visitReifyTypeVar(ReifyTypeVar node, A arg);
   E visitConditional(Conditional node, A arg);
   E visitLogicalOperator(LogicalOperator node, A arg);
   E visitNot(Not node, A arg);
   E visitLiteralList(LiteralList node, A arg);
   E visitLiteralMap(LiteralMap node, A arg);
   E visitTypeOperator(TypeOperator node, A arg);
   E visitFunctionExpression(FunctionExpression node, A arg);
   E visitFieldInitializer(FieldInitializer node, A arg);
   E visitSuperInitializer(SuperInitializer node, A arg);
   E visitGetField(GetField node, A arg);
   E visitCreateBox(CreateBox node, A arg);
   E visitCreateInstance(CreateInstance node, A arg);
+  E visitReifyRuntimeType(ReifyRuntimeType reifyRuntimeType, A arg);
+  E visitReadTypeVariable(ReadTypeVariable readTypeVariable, A arg);
 }
 
 abstract class StatementVisitor<S> {
   S visitStatement(Statement s) => s.accept(this);
   S visitLabeledStatement(LabeledStatement node);
   S visitAssign(Assign node);
   S visitReturn(Return node);
   S visitBreak(Break node);
   S visitContinue(Continue node);
   S visitIf(If node);
@@ skipping 174 matching lines @@
     visitExpression(node.value);
     visitStatement(node.next);
   }
 
   visitCreateBox(CreateBox node) {
   }
 
   visitCreateInstance(CreateInstance node) {
     node.arguments.forEach(visitExpression);
   }
+
+  visitReifyRuntimeType(ReifyRuntimeType node) {
+    visitExpression(node.value);
+  }
+
+  visitReadTypeVariable(ReadTypeVariable node) {
+    visitExpression(node.target);
+  }
 }