Throw when reflecting on elements not covered by a `MirrorsUsed` annotation.

sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index e7eb3ce1eb92696f13a5652c252591e0ddb73983..4e45ae9ecd9d50ab67c635d3bda650cee081d06c 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -287,6 +287,7 @@ class CodeEmitterTask extends CompilerTask {
   static const RANGE2_LAST = 0x7e;
   static const RANGE3_FIRST = 0x25;   //  %&'()*+  encodes 10..16
   static const RANGE3_LAST = 0x2b;
+  static const REFLECTION_MARKER = 0x2d;
 
   jsAst.FunctionDeclaration get generateAccessorFunction {
     const RANGE1_SIZE = RANGE1_LAST - RANGE1_FIRST + 1;
@@ -298,11 +299,19 @@ class CodeEmitterTask extends CompilerTask {
 
     String receiverParamName = compiler.enableMinification ? "r" : "receiver";
     String valueParamName = compiler.enableMinification ? "v" : "value";
+    String reflectableField = namer.reflectableField;
 
     // function generateAccessor(field, prototype) {
     jsAst.Fun fun = js.fun(['field', 'prototype'], [
       js('var len = field.length'),
       js('var code = field.charCodeAt(len - 1)'),
+      js('var reflectable = false'),
+      js.if_('code == $REFLECTION_MARKER', [
+          js('len--'),
+          js('code = field.charCodeAt(len - 1)'),
+          js('field = field.substring(0, len)'),
+          js('reflectable = true')
+      ]),
       js('code = ((code >= $RANGE1_FIRST) && (code <= $RANGE1_LAST))'
           '    ? code - $RANGE1_ADJUST'
           '    : ((code >= $RANGE2_FIRST) && (code <= $RANGE2_LAST))'
@@ -329,7 +338,10 @@ class CodeEmitterTask extends CompilerTask {
           js('var receiver = (getterCode & 1) ? "this" : "$receiverParamName"'),
           js('var body = "return " + receiver + "." + field'),
           js('prototype["${namer.getterPrefix}" + accessorName] = '
-                 'new Function(args, body)')
+                 'new Function(args, body)'),
+          js.if_('!reflectable', [
+                 js('prototype["${namer.getterPrefix}" + accessorName].'
+                    '$reflectableField = false')])
         ]),
 
         // if (needsSetter) {
@@ -340,7 +352,10 @@ class CodeEmitterTask extends CompilerTask {
           js('var receiver = (setterCode & 1) ? "this" : "$receiverParamName"'),
           js('var body = receiver + "." + field + "$_=$_$valueParamName"'),
           js('prototype["${namer.setterPrefix}" + accessorName] = '
-                 'new Function(args, body)')
+                 'new Function(args, body)'),
+          js.if_('!reflectable', [
+                 js('prototype["${namer.setterPrefix}" + accessorName].'
+                    '$reflectableField = false')])
         ]),
 
       ]),
@@ -1099,7 +1114,9 @@ class CodeEmitterTask extends CompilerTask {
 
     String reflectionName = getReflectionName(selector, invocationName);
     if (reflectionName != null) {
-      defineStub('+$reflectionName', js('0'));
+      var reflectable =
+          js(backend.isAccessibleByReflection(member) ? '1' : '0');
+      defineStub('+$reflectionName', reflectable);
     }
   }
 
@@ -1270,7 +1287,9 @@ class CodeEmitterTask extends CompilerTask {
       builder.addProperty(name, code);
       String reflectionName = getReflectionName(member, name);
       if (reflectionName != null) {
-        builder.addProperty('+$reflectionName', js('0'));
+        var reflectable =
+            js(backend.isAccessibleByReflection(member) ? '1' : '0');
+        builder.addProperty('+$reflectionName', reflectable);
       }
       code = backend.generatedBailoutCode[member];
       if (code != null) {
@@ -1325,7 +1344,10 @@ class CodeEmitterTask extends CompilerTask {
       String getter = '${namer.getterPrefix}$base';
       mangledFieldNames[getter] = name;
       recordedMangledNames.add(getter);
-      return null;
+      // TODO(karlklose,ahe): we do not actually need to store information
+      // about the name of this setter in the output, but it is needed for
+      // marking the function as invokable by reflection.
+      return '$name=';
     }
     if (elementOrSelector is Selector
         || elementOrSelector.isFunction()
@@ -1861,6 +1883,9 @@ class CodeEmitterTask extends CompilerTask {
               buffer.write(FIELD_CODE_CHARACTERS[code - FIRST_FIELD_CODE]);
             }
           }
+          if (backend.isAccessibleByReflection(field)) {
+            buffer.write(new String.fromCharCode(REFLECTION_MARKER));
+          }
         }
       });
     }
@@ -2300,7 +2325,8 @@ class CodeEmitterTask extends CompilerTask {
       emitStaticFunction(buffer, name, code);
       String reflectionName = getReflectionName(element, name);
       if (reflectionName != null) {
-        buffer.write(',$n$n"+$reflectionName":${_}0');
+        var reflectable = backend.isAccessibleByReflection(element) ? 1 : 0;
+        buffer.write(',$n$n"+$reflectionName":${_}$reflectable');
       }
       jsAst.Expression bailoutCode = backend.generatedBailoutCode[element];
       if (bailoutCode != null) {
@@ -4030,6 +4056,7 @@ class CodeEmitterTask extends CompilerTask {
   // TODO(ahe): This code should be integrated in finishClasses.
   String getReflectionDataParser() {
     String metadataField = '"${namer.metadataField}"';
+    String reflectableField = namer.reflectableField;
     return '''
 (function (reflectionData) {
 '''
@@ -4078,7 +4105,9 @@ class CodeEmitterTask extends CompilerTask {
         var previousProperty;
         if (firstChar === "+") {
           mangledGlobalNames[previousProperty] = property.substring(1);
-          if (element && element.length) ''' // Breaking long line.
+          descriptor[previousProperty].''' // Break long line.
+'''$reflectableField = (descriptor[property] == 1);
+          if (element && element.length) ''' // Break long line.
 '''init.interfaces[previousProperty] = element;
         } else if (firstChar === "@") {
           property = property.substring(1);
@@ -4097,6 +4126,8 @@ class CodeEmitterTask extends CompilerTask {
               processStatics(init.statics[property] = element[prop]);
             } else if (firstChar === "+") {
               mangledNames[previousProp] = prop.substring(1);
+              element[previousProp].''' // Break long line.
+'''$reflectableField = (element[prop] == 1);
             } else if (firstChar === "@" && prop !== "@") {
               newDesc[prop.substring(1)][$metadataField] = element[prop];
             } else {