Add UInt32 and UInt31 types to better infer bit operations.

sdk/lib/_internal/compiler/implementation/inferrer/inferrer_visitor.dart

 // Copyright (c) 2013, 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 inferrer_visitor;
 
 import '../dart2jslib.dart' hide Selector, TypedSelector;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../tree/tree.dart';
 import '../universe/universe.dart';
 import '../util/util.dart';
+import '../types/types.dart' show TypeMask;
 
 /**
  * The interface [InferrerVisitor] will use when working on types.
  */
 abstract class TypeSystem<T> {
   T get dynamicType;
   T get nullType;
   T get intType;
+  T get uint31Type;
+  T get uint32Type;
   T get doubleType;
   T get numType;
   T get boolType;
   T get functionType;
   T get listType;
   T get constListType;
   T get fixedListType;
   T get growableListType;
   T get mapType;
   T get constMapType;
@@ skipping 47 matching lines @@
   /**
    * Adds [newType] as an input of [phiType].
    */
   T addPhiInput(Element element, T phiType, T newType);
 
   /**
    * Returns a new receiver type for this [selector] applied to
    * [receiverType].
    */
   T refineReceiver(Selector selector, T receiverType);
+
+  /**
+   * Returns the internal inferrer representation for [mask].
+   */
+  T getConcreteTypeFor(TypeMask mask);
 }
 
 /**
  * A variable scope holds types for variables. It has a link to a
  * parent scope, but never changes the types in that parent. Instead,
  * updates to locals of a parent scope are put in the current scope.
  * The inferrer makes sure updates get merged into the parent scope,
  * once the control flow block has been visited.
  */
 class VariableScope<T> {
@@ skipping 143 matching lines @@
     named.forEach((name, type) {
       if (other.named[name] != type) return false;
     });
     return true;
   }
 
   int get hashCode => throw new UnsupportedError('ArgumentsTypes.hashCode');
 
   bool hasNoArguments() => positional.isEmpty && named.isEmpty;
 
-  bool hasOnePositionalArgumentWithType(T type) {
-    return named.isEmpty && positional.length == 1 && positional[0] == type;
+  bool hasOnePositionalArgumentThatMatches(bool f(T type)) {
+    return named.isEmpty && positional.length == 1 && f(positional[0]);
   }
 
   void forEach(void f(T type)) {
     positional.forEach(f);
     named.values.forEach(f);
   }
 
   bool every(bool f(T type)) {
     return positional.every(f) && named.values.every(f);
   }
@@ skipping 382 matching lines @@
     node.visitChildren(this);
     return types.stringType;
   }
 
   T visitLiteralBool(LiteralBool node) {
     return types.boolType;
   }
 
   T visitLiteralDouble(LiteralDouble node) {
     ConstantSystem constantSystem = compiler.backend.constantSystem;
-    Constant constant = constantSystem.createDouble(node.value);
     // The JavaScript backend may turn this literal into an integer at
     // runtime.
-    return constantSystem.isDouble(constant)
-        ? types.doubleType
-        : types.intType;
+    return types.getConcreteTypeFor(
+        constantSystem.createDouble(node.value).computeMask(compiler));
   }
 
   T visitLiteralInt(LiteralInt node) {
     ConstantSystem constantSystem = compiler.backend.constantSystem;
-    Constant constant = constantSystem.createInt(node.value);
     // The JavaScript backend may turn this literal into a double at
     // runtime.
-    return constantSystem.isDouble(constant)
-        ? types.doubleType
-        : types.intType;
+    return types.getConcreteTypeFor(
+        constantSystem.createInt(node.value).computeMask(compiler));
   }
 
   T visitLiteralList(LiteralList node) {
     node.visitChildren(this);
     return node.isConst() ? types.constListType : types.growableListType;
   }
 
   T visitLiteralMap(LiteralMap node) {
     node.visitChildren(this);
     return node.isConst() ? types.constMapType : types.mapType;
@@ skipping 463 matching lines @@
     return type;
   }
 
   T visitCascade(Cascade node) {
     // Ignore the result of the cascade send and return the type of the cascade
     // receiver.
     visit(node.expression);
     return cascadeReceiverStack.removeLast();
   }
 }