Make constant lists immutable.

lib/compiler/implementation/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
 
   String generateMethod(WorkItem work, HGraph graph) {
@@ skipping 1355 matching lines @@
     endExpression(JSPrecedence.EQUALITY_PRECEDENCE);
   }
 
   void checkArray(HInstruction input, String cmp) {
     beginExpression(JSPrecedence.EQUALITY_PRECEDENCE);
     use(input, JSPrecedence.MEMBER_PRECEDENCE);
     buffer.add('.constructor $cmp Array');
     endExpression(JSPrecedence.EQUALITY_PRECEDENCE);
   }
 
+  void checkImmutableArray(HInstruction input) {
+    beginExpression(JSPrecedence.PREFIX_PRECEDENCE);
+    buffer.add('!!');
+    use(input, JSPrecedence.MEMBER_PRECEDENCE);
+    buffer.add('.immutable\$list');
+    endExpression(JSPrecedence.PREFIX_PRECEDENCE);
+  }
+
   void checkNull(HInstruction input) {
     beginExpression(JSPrecedence.EQUALITY_PRECEDENCE);
     use(input, JSPrecedence.EQUALITY_PRECEDENCE);
     buffer.add(" === (void 0)");
     endExpression(JSPrecedence.EQUALITY_PRECEDENCE);
   }
 
   void checkFunction(HInstruction input, Element element) {
     beginExpression(JSPrecedence.LOGICAL_OR_PRECEDENCE);
     beginExpression(JSPrecedence.EQUALITY_PRECEDENCE);
@@ skipping 165 matching lines @@
     } else if (node.isBoolean()) {
       buffer.add('if (');
       checkBool(input, '!==');
       buffer.add(') ');
       bailout(node, 'Not a boolean');
     } else if (node.isString()) {
       buffer.add('if (');
       checkString(input, '!==');
       buffer.add(') ');
       bailout(node, 'Not a string');
+    } else if (node.isMutableArray()) {
+      buffer.add('if (');
+      checkObject(input, '!==');
+      buffer.add('||');
+      checkArray(input, '!==');
+      buffer.add('||');
+      checkImmutableArray(input);
+      buffer.add(') ');
+      bailout(node, 'Not a mutable array');      
     } else if (node.isArray()) {
       buffer.add('if (');
       checkObject(input, '!==');
       buffer.add('||');
       checkArray(input, '!==');
       buffer.add(') ');
       bailout(node, 'Not an array');
     } else if (node.isStringOrArray()) {
       buffer.add('if (');
       checkString(input, '!==');
@@ skipping 277 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endElse(HIf node) {
     if (node.elseBlock.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }