In background compilation make a copy of Field in order to freeze its state

runtime/lib/mirrors.cc

 // 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.
 
 #include "lib/mirrors.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 671 matching lines @@
             Function::Handle(getter.ImplicitClosureFunction());
         return closure_function.ImplicitStaticClosure();
       }
     }
   } else {
     if (!field.IsUninitialized()) {
       return field.StaticValue();
     }
     // An uninitialized field was found.  Check for a getter in the field's
     // owner classs.
-    const Class& klass = Class::Handle(field.owner());
+    const Class& klass = Class::Handle(field.Owner());
     const String& internal_getter_name =
         String::Handle(Field::GetterName(getter_name));
     getter = klass.LookupStaticFunction(internal_getter_name);
   }
 
   if (!getter.IsNull() && getter.is_reflectable()) {
     // Invoke the getter and return the result.
     const Object& result = Object::Handle(
         DartEntry::InvokeFunction(getter, Object::empty_array()));
     return ReturnResult(result);
@@ skipping 173 matching lines @@
   Class& klass = Class::Handle();
   Library& library = Library::Handle();
 
   if (decl.IsClass()) {
     klass ^= decl.raw();
     library = klass.library();
   } else if (decl.IsFunction()) {
     klass = Function::Cast(decl).origin();
     library = klass.library();
   } else if (decl.IsField()) {
-    klass = Field::Cast(decl).origin();
+    klass = Field::Cast(decl).Origin();
     library = klass.library();
   } else if (decl.IsLibrary()) {
     library ^= decl.raw();
   } else if (decl.IsTypeParameter()) {
     klass ^= TypeParameter::Cast(decl).parameterized_class();
     library = klass.library();
   } else {
     return Object::empty_array().raw();
   }
 
@@ skipping 1089 matching lines @@
     if (cls.is_synthesized_class() &&
         !is_typedef &&
         !cls.is_mixin_app_alias() &&
         !cls.is_enum_class()) {
       return Instance::null();  // Synthetic.
     }
     script = cls.script();
     token_pos = cls.token_pos();
   } else if (decl.IsField()) {
     const Field& field = Field::Cast(decl);
-    script = field.script();
+    script = field.Script();
     token_pos = field.token_pos();
   } else if (decl.IsTypeParameter()) {
     const TypeParameter& type_var = TypeParameter::Cast(decl);
     const Class& owner = Class::Handle(type_var.parameterized_class());
     script = owner.script();
     token_pos = type_var.token_pos();
   } else if (decl.IsLibrary()) {
     const Library& lib = Library::Cast(decl);
     if (lib.raw() == Library::NativeWrappersLibrary()) {
       return Instance::null();  // No source.
@@ skipping 79 matching lines @@
 
 DEFINE_NATIVE_ENTRY(TypeMirror_subtypeTest, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
   return Bool::Get(a.IsSubtypeOf(b, NULL, NULL, Heap::kNew)).raw();
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart