WIP: Compute constant expressions in resolution.

pkg/compiler/lib/src/constants/constant_system.dart

 // Copyright (c) 2012, 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 dart2js.constant_system;
 
 import '../dart_types.dart';
 import '../compiler.dart' show
     Compiler;
 import '../resolution/operators.dart';
@@ skipping 31 matching lines @@
   BinaryOperation get equal;
   BinaryOperation get greaterEqual;
   BinaryOperation get greater;
   BinaryOperation get identity;
   BinaryOperation get lessEqual;
   BinaryOperation get less;
   BinaryOperation get modulo;
   BinaryOperation get multiply;
   UnaryOperation get negate;
   UnaryOperation get not;
+  BinaryOperation get notEqual;
   BinaryOperation get shiftLeft;
   BinaryOperation get shiftRight;
   BinaryOperation get subtract;
   BinaryOperation get truncatingDivide;
 
   BinaryOperation get codeUnitAt;
 
   const ConstantSystem();
 
   ConstantValue createInt(int i);
   ConstantValue createDouble(double d);
   ConstantValue createString(DartString string);
   ConstantValue createBool(bool value);
   ConstantValue createNull();
   ConstantValue createList(InterfaceType type,
                            List<ConstantValue> values);
   // TODO(johnniwinther): Remove the need for [compiler].
   ConstantValue createMap(Compiler compiler,
                           InterfaceType type,
                           List<ConstantValue> keys,
                           List<ConstantValue> values);
   // TODO(johnniwinther): Remove the need for [compiler].
   ConstantValue createType(Compiler compiler,
                            DartType type);
+  ConstantValue createSymbol(Compiler compiler, String text);
 
   // We need to special case the subtype check for JavaScript constant
   // system because an int is a double at runtime.
   bool isSubtype(DartTypes types, DartType s, DartType t);
 
   /** Returns true if the [constant] is an integer at runtime. */
   bool isInt(ConstantValue constant);
   /** Returns true if the [constant] is a double at runtime. */
   bool isDouble(ConstantValue constant);
   /** Returns true if the [constant] is a string at runtime. */
@@ skipping 25 matching lines @@
       case BinaryOperatorKind.XOR:   return bitXor;
       case BinaryOperatorKind.LOGICAL_OR:  return booleanOr;
       case BinaryOperatorKind.LOGICAL_AND:  return booleanAnd;
       case BinaryOperatorKind.SHL:  return shiftLeft;
       case BinaryOperatorKind.SHR:  return shiftRight;
       case BinaryOperatorKind.LT:   return less;
       case BinaryOperatorKind.LTEQ:  return lessEqual;
       case BinaryOperatorKind.GT:   return greater;
       case BinaryOperatorKind.GTEQ:  return greaterEqual;
       case BinaryOperatorKind.EQ:  return equal;
+      case BinaryOperatorKind.NOT_EQ:  return notEqual;
       default:    return null;
     }
   }
 }