Implement constant maps.

tests/language/src/CompileTimeConstantBTest.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.
+
+final m1 = const { '__proto__': 400 + 99 };
+final m2 = const { 'a': 499, 'b': 42 };
+final m3 = const { '__proto__': 499 };
+
+bool isIllegalAccessException(o) => o is IllegalAccessException;
+
+main() {
+  Expect.equals(499, m1['__proto__']);
+  Expect.equals(null, m1['b']);
+  Expect.listEquals(['__proto__'], m1.getKeys());
+  Expect.listEquals([499], m1.getValues());
+  Expect.isTrue(m1.containsKey('__proto__'));
+  Expect.isFalse(m1.containsKey('toString'));
+  Expect.isTrue(m1.containsValue(499));
+  Expect.isFalse(m1.containsValue(null));
+  var seenKeys = [];
+  var seenValues = [];
+  m1.forEach((key, value) {
+    seenKeys.add(key);
+    seenValues.add(value);
+  });
+  Expect.listEquals(['__proto__'], seenKeys);
+  Expect.listEquals([499], seenValues);
+  Expect.isFalse(m1.isEmpty());
+  Expect.equals(1, m1.length);
+  Expect.throws(() => m1.remove('__proto__'), isIllegalAccessException);
+  Expect.throws(() => m1.remove('b'), isIllegalAccessException);
+  Expect.throws(() => m1.clear(), isIllegalAccessException);
+  Expect.throws(() => m1['b'] = 42, isIllegalAccessException);
+  Expect.throws(() => m1['__proto__'] = 499, isIllegalAccessException);
+  Expect.throws(() => m1.putIfAbsent('__proto__', () => 499),
+                isIllegalAccessException);
+  Expect.throws(() => m1.putIfAbsent('z', () => 499),
+                isIllegalAccessException);
+
+  Expect.equals(499, m2['a']);
+  Expect.equals(42, m2['b']);
+  Expect.equals(null, m2['c']);
+  Expect.equals(null, m2['__proto__']);
+  Expect.listEquals(['a', 'b'], m2.getKeys());
+  Expect.listEquals([499, 42], m2.getValues());
+  Expect.isTrue(m2.containsKey('a'));
+  Expect.isTrue(m2.containsKey('b'));
+  Expect.isFalse(m2.containsKey('toString'));
+  Expect.isFalse(m2.containsKey('__proto__'));
+  Expect.isTrue(m2.containsValue(499));
+  Expect.isTrue(m2.containsValue(42));
+  Expect.isFalse(m2.containsValue(null));
+  seenKeys = [];
+  seenValues = [];
+  m2.forEach((key, value) {
+    seenKeys.add(key);
+    seenValues.add(value);
+  });
+  Expect.listEquals(['a', 'b'], seenKeys);
+  Expect.listEquals([499, 42], seenValues);
+  Expect.isFalse(m2.isEmpty());
+  Expect.equals(2, m2.length);
+  Expect.throws(() => m2.remove('a'), isIllegalAccessException);
+  Expect.throws(() => m2.remove('b'), isIllegalAccessException);
+  Expect.throws(() => m2.remove('__proto__'), isIllegalAccessException);
+  Expect.throws(() => m2.clear(), isIllegalAccessException);
+  Expect.throws(() => m2['a'] = 499, isIllegalAccessException);
+  Expect.throws(() => m2['b'] = 42, isIllegalAccessException);
+  Expect.throws(() => m2['__proto__'] = 499, isIllegalAccessException);
+  Expect.throws(() => m2.putIfAbsent('a', () => 499),
+                isIllegalAccessException);
+  Expect.throws(() => m2.putIfAbsent('__proto__', () => 499),
+                isIllegalAccessException);
+  Expect.throws(() => m2['a'] = 499, isIllegalAccessException);
+
+  Expect.isTrue(m1 === m3);
+}