Handle compound operators.

tests/compiler/dart2js/cpa_inference_test.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.
 
 import "dart:uri";
 import "../../../lib/compiler/implementation/elements/elements.dart";
 import '../../../lib/compiler/implementation/scanner/scannerlib.dart';
 import '../../../lib/compiler/implementation/source_file.dart';
 import '../../../lib/compiler/implementation/types/types.dart';
 import '../../../lib/compiler/implementation/tree/tree.dart';
@@ skipping 502 matching lines @@
         var x = new A() < "foo";
         var y = new A() << "foo";
         x; y;
       }
       """;
   AnalysisResult result = analyze(source);
   result.checkNodeHasType('x', [result.int]);
   result.checkNodeHasType('y', [result.string]);
 }
 
+testCompoundOperators1() {
+  final String source = r"""
+      class A {
+        operator +(x) => "foo";
+      }
+      main() {
+        var x1 = 1; x1++;
+        var x2 = 1; ++x2;
+        var x3 = new A(); x3++;
+        var x4 = new A(); ++x4;
+
+        x1; x2; x3; x4;
+      }
+      """;
+  AnalysisResult result = analyze(source);
+  result.checkNodeHasType('x1', [result.int]);
+  result.checkNodeHasType('x2', [result.int]);
+  result.checkNodeHasType('x3', [result.string]);
+  result.checkNodeHasType('x4', [result.string]);
+}
+
+
+testCompoundOperators2() {
+  final String source = r"""
+    class A {
+      var _x;

[karlklose, 2012/11/08 10:45:31]

It is unnecessary to use privacy here; using a normal would perhaps make the
test easier to understand.

[polux, 2012/11/08 14:04:50]

Done.

+      var witness1;
+      var witness2;

[karlklose, 2012/11/08 10:45:31]

witness2 is unused. Did you want to use it in the setter and the second test?

[polux, 2012/11/08 14:04:50]

Done.

+
+      A(this._x);
+      get x { witness1 = "foo"; return _x; }
+      set x(y) { witness1 = "foo"; _x = y; }
+    }
+    main () {
+      var a = new A(1);
+      a.x++;
+    }
+    """;
+  AnalysisResult result = analyze(source);
+  result.checkFieldHasType('A', '_x', [result.int]);
+  // TODO(polux): the two following results should be {null, string}, see
+  // fieldInitialization().
+  result.checkFieldHasType('A', 'witness1', [result.string]);
+  result.checkFieldHasType('A', 'witness1', [result.string]);

[karlklose, 2012/11/08 10:45:31]

witness2?

[polux, 2012/11/08 14:04:50]

Done.

+}
+
+testFieldInitialization() {
+  final String source = r"""
+    class A {
+      var x;
+      var y = 1;
+    }
+    main () {
+      new A();
+    }
+    """;
+  AnalysisResult result = analyze(source);
+  result.checkFieldHasType('A', 'x', [result.nullType]);
+  result.checkFieldHasType('A', 'y', [result.int]);
+}
+
 void main() {
   testLiterals();
   testRedefinition();
   testIfThenElse();
   testTernaryIf();
   testWhile();
   testFor1();
   testFor2();
   testNonRecusiveFunction();
   testRecusiveFunction();
   testMutuallyRecusiveFunction();
   testSendToThis1();
   testSendToThis2();
   testConstructor();
   testGetters();
   testSetters();
   testNamedParameters();
   testListLiterals();
   testMapLiterals();
   testReturn();
   // testNoReturn(); // right now we infer the empty type instead of null
   testArithmeticOperators();
   testOperators();
+  testCompoundOperators1();
+  testCompoundOperators2();
+  // testFieldInitialization(); // TODO(polux)
 }