Evaluate expression in the context of a class

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 26604)
+++ runtime/vm/object.cc	(working copy)
@@ -2051,6 +2051,55 @@
 }
 
 
+static RawPatchClass* MakeTempPatchClass(const Class& cls,
+                                         const String& expr) {
+  String& src = String::Handle(String::New("() => "));
+  src = String::Concat(src, expr);
+  src = String::Concat(src, Symbols::Semicolon());
+  Script& script = Script::Handle();
+  script = Script::New(Symbols::Empty(), src, RawScript::kSourceTag);
+  // In order to tokenize the source, we need to get the key to mangle
+  // private names from the library from which the object's class
+  // originates.
+  const Library& lib = Library::Handle(cls.library());
+  ASSERT(!lib.IsNull());
+  const String& lib_key = String::Handle(lib.private_key());
+  script.Tokenize(lib_key);
+
+  const String& src_class_name = String::Handle(Symbols::New(":internal"));
+  const Class& src_class = Class::Handle(
+      Class::New(src_class_name, script, Scanner::kDummyTokenIndex));
+  src_class.set_is_finalized();
+  src_class.set_library(lib);
+  return PatchClass::New(cls, src_class);
+}
+
+
+RawObject* Class::Evaluate(const String& expr) const {
+  const PatchClass& temp_class =
+      PatchClass::Handle(MakeTempPatchClass(*this, expr));
+  const String& eval_func_name = String::Handle(Symbols::New(":eval"));
+  const Function& eval_func =
+      Function::Handle(Function::New(eval_func_name,
+                                     RawFunction::kRegularFunction,
+                                     true,   // Static.
+                                     false,  // Not const.
+                                     false,  // Not abstract.
+                                     false,  // Not external.
+                                     temp_class,
+                                     0));
+  eval_func.set_result_type(Type::Handle(Type::DynamicType()));
+  eval_func.set_num_fixed_parameters(0);
+  eval_func.SetNumOptionalParameters(0, true);
+  eval_func.set_is_optimizable(false);
+
+  const Array& args = Array::Handle(Array::New(0));
+  const Object& result =
+      Object::Handle(DartEntry::InvokeFunction(eval_func, args));
+  return result.raw();
+}
+
+
 // Ensure that top level parsing of the class has been done.
 RawError* Class::EnsureIsFinalized(Isolate* isolate) const {
   // Finalized classes have already been parsed.
@@ -10012,30 +10061,6 @@
 }
 
 
-static RawPatchClass* MakeTempPatchClass(const Class& cls,
-                                         const String& expr) {
-  String& src = String::Handle(String::New("() => "));
-  src = String::Concat(src, expr);
-  src = String::Concat(src, Symbols::Semicolon());
-  Script& script = Script::Handle();
-  script = Script::New(Symbols::Empty(), src, RawScript::kSourceTag);
-  // In order to tokenize the source, we need to get the key to mangle
-  // private names from the library from which the object's class
-  // originates.
-  const Library& lib = Library::Handle(cls.library());
-  ASSERT(!lib.IsNull());
-  const String& lib_key = String::Handle(lib.private_key());
-  script.Tokenize(lib_key);
-
-  const String& src_class_name = String::Handle(Symbols::New(":internal"));
-  const Class& src_class = Class::Handle(
-      Class::New(src_class_name, script, Scanner::kDummyTokenIndex));
-  src_class.set_is_finalized();
-  src_class.set_library(lib);
-  return PatchClass::New(cls, src_class);
-}
-
-
 RawObject* Instance::Evaluate(const String& expr) const {
   const Class& cls = Class::Handle(clazz());
   const PatchClass& temp_class =