Use field names that are unique only wrt. the inheritance chain in minified mode.

tests/compiler/dart2js_extra/many_fields_test.dart

+// Copyright (c) 2011, 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 "package:expect/expect.dart";
+
+// A plain class that implements many fields.
+class A {
+  var fieldA1 = 0x1;
+  var fieldA2 = 0x2;
+  var fieldA3 = 0x4;
+  var fieldA4 = 0x8;
+
+  var fieldB1 = 0x10;
+  var fieldB2 = 0x20;
+  var fieldB3 = 0x40;
+  var fieldB4 = 0x80;
+
+  var fieldC1 = 0x100;
+  var fieldC2 = 0x200;
+  var fieldC3 = 0x400;
+  var fieldC4 = 0x800;
+
+  var fieldD1 = 0x1000;
+  var fieldD2 = 0x2000;
+  var fieldD3 = 0x4000;
+  var fieldD4 = 0x8000;
+  
+  var fieldXA1 = 0x1;
+  var fieldXA2 = 0x2;
+  var fieldXA3 = 0x4;
+  var fieldXA4 = 0x8;
+
+  var fieldXB1 = 0x10;
+  var fieldXB2 = 0x20;
+  var fieldXB3 = 0x40;
+  var fieldXB4 = 0x80;
+
+  var fieldXC1 = 0x1;
+  var fieldXC2 = 0x2;
+  var fieldXC3 = 0x4;
+  var fieldXC4 = 0x8;
+
+  var fieldXD1 = 0x10;
+  var fieldXD2 = 0x20;
+  var fieldXD3 = 0x40;
+  var fieldXD4 = 0x80;
+  
+  var fieldYA1 = 0x1;
+  var fieldYA2 = 0x200;
+  var fieldYA3 = 0x400;
+  var fieldYA4 = 0x800;
+
+  var fieldYB1 = 0x10;
+  var fieldYB2 = 0x200;
+  var fieldYB3 = 0x400;
+  var fieldYB4 = 0x800;
+
+  var fieldYC1 = 0x100;
+  var fieldYC2 = 0x2000;
+  var fieldYC3 = 0x4000;
+  var fieldYC4 = 0x8000;
+
+  var fieldYD1 = 0x1000;
+  var fieldYD2 = 0x2000;
+  var fieldYD3 = 0x4000;
+  var fieldYD4 = 0x8000;
+}
+
+// Implementing the same fields using inheritance and a mixin.
+class B {
+  var fieldA1 = 0x0011;
+  var fieldA2 = 0x0002;
+  var fieldA3 = 0x0044;
+  var fieldA4 = 0x0008;
+
+  var fieldB1 = 0x0010;
+  var fieldB2 = 0x0220;
+  var fieldB3 = 0x0040;
+  var fieldB4 = 0x0880;
+
+  var fieldC1 = 0x0101;
+  var fieldC2 = 0x0200;
+  var fieldC3 = 0x0404;
+  var fieldC4 = 0x0810;
+
+  var fieldD1 = 0x1000;
+  var fieldD2 = 0x2204;
+  var fieldD3 = 0x4040;
+  var fieldD4 = 0x8801;
+}
+
+class C {
+  var fieldXA1 = 0x8001;
+  var fieldXA2 = 0x4002;
+  var fieldXA3 = 0x2004;
+  var fieldXA4 = 0x1008;
+
+  var fieldXB1 = 0x810;
+  var fieldXB2 = 0x420;
+  var fieldXB3 = 0x240;
+  var fieldXB4 = 0x180;
+
+  var fieldXC1 = 0x180;
+  var fieldXC2 = 0x240;
+  var fieldXC3 = 0x420;
+  var fieldXC4 = 0x810;
+
+  var fieldXD1 = 0x1008;
+  var fieldXD2 = 0x2004;
+  var fieldXD3 = 0x4002;
+  var fieldXD4 = 0x8001;
+}
+
+class D extends B with C {
+  var fieldYA1 = 0x8001;
+  var fieldYA2 = 0x4002;
+  var fieldYA3 = 0x2004;
+  var fieldYA4 = 0x0008;
+
+  var fieldYB1 = 0x810;
+  var fieldYB2 = 0x420;
+  var fieldYB3 = 0x240;
+  var fieldYB4 = 0x080;
+
+  var fieldYC1 = 0x180;
+  var fieldYC2 = 0x240;
+  var fieldYC3 = 0x420;
+  var fieldYC4 = 0x800;
+
+  var fieldYD1 = 0x1008;
+  var fieldYD2 = 0x2004;
+  var fieldYD3 = 0x4002;
+  var fieldYD4 = 0x8000;
+}
+
+// Mix in the mixin into the full implementation, shadowing some fields.
+class E extends A with C {
+}
+
+// Another mixin for block C.
+class F {
+  var fieldYA1 = 0x0001;
+  var fieldYA2 = 0x1022;
+  var fieldYA3 = 0x0004;
+  var fieldYA4 = 0x0088;
+
+  var fieldYB1 = 0x0410;
+  var fieldYB2 = 0x0022;
+  var fieldYB3 = 0x0040;
+  var fieldYB4 = 0x0880;
+
+  var fieldYC1 = 0x1001;
+  var fieldYC2 = 0x2200;
+  var fieldYC3 = 0x4400;
+  var fieldYC4 = 0x8800;
+
+  var fieldYD1 = 0x1108;
+  var fieldYD2 = 0x2200;
+  var fieldYD3 = 0x4044;
+  var fieldYD4 = 0x8001;
+}
+
+// Use two mixins in a single class.
+class G extends B with C, F {
+}
+
+bool checkFields(cls) {
+  var blockA = 
+    cls.fieldA1 ^ cls.fieldA2 ^ cls.fieldA3 ^ cls.fieldA4 ^
+    cls.fieldB1 ^ cls.fieldB2 ^ cls.fieldB3 ^ cls.fieldB4 ^
+    cls.fieldC1 ^ cls.fieldC2 ^ cls.fieldC3 ^ cls.fieldC4 ^
+    cls.fieldD1 ^ cls.fieldD2 ^ cls.fieldD3 ^ cls.fieldD4;
+  var blockB =
+    cls.fieldXA1 ^ cls.fieldXA2 ^ cls.fieldXA3 ^ cls.fieldXA4 ^
+    cls.fieldXB1 ^ cls.fieldXB2 ^ cls.fieldXB3 ^ cls.fieldXB4 ^
+    cls.fieldXC1 ^ cls.fieldXC2 ^ cls.fieldXC3 ^ cls.fieldXC4 ^
+    cls.fieldXD1 ^ cls.fieldXD2 ^ cls.fieldXD3 ^ cls.fieldXD4;
+  var blockC =
+    cls.fieldYA1 ^ cls.fieldYA2 ^ cls.fieldYA3 ^ cls.fieldYA4 ^
+    cls.fieldYB1 ^ cls.fieldYB2 ^ cls.fieldYB3 ^ cls.fieldYB4 ^
+    cls.fieldYC1 ^ cls.fieldYC2 ^ cls.fieldYC3 ^ cls.fieldYC4 ^
+    cls.fieldYD1 ^ cls.fieldYD2 ^ cls.fieldYD3 ^ cls.fieldYD4;
+  return blockA == 0xFFFF && blockB == 0x0000 && blockC == 0x1111;
+}
+
+main () {
+  var instances = [new A(), new D(), new E(), new G()];
+  for (var instance in instances) {
+    Expect.isTrue(checkFields(instance));
+  }
+}