Implement Evaluate without creating new classes.

runtime/vm/compiler_test.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 "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
 #include "vm/symbols.h"
@@ skipping 81 matching lines @@
   Object& val = Object::Handle();
   val = Instance::Cast(obj).Evaluate(expr_text,
                                      Array::empty_array(),
                                      Array::empty_array());
   EXPECT(!val.IsNull());
   EXPECT(!val.IsError());
   EXPECT(val.IsString());
   EXPECT_STREQ("Herr Nilsson 100.", val.ToCString());
 }
 
+
+TEST_CASE(EvalExpressionWithLazyCompile) {
+  Library& lib = Library::Handle(Library::CoreLibrary());
+
+  const String& expression = String::Handle(String::New(
+      "(){ return (){ return (){ return 3 + 4; }(); }(); }()"));
+  Object& val = Object::Handle();
+  val = lib.Evaluate(expression, Array::empty_array(), Array::empty_array());
+
+  EXPECT(!val.IsNull());
+  EXPECT(!val.IsError());
+  EXPECT(val.IsInteger());
+  EXPECT_EQ(7, Integer::Cast(val).AsInt64Value());
+}
+
+
+TEST_CASE(EvalExpressionExhaustCIDs) {
+  Library& lib = Library::Handle(Library::CoreLibrary());
+
+  const String& expression = String::Handle(String::New("3 + 4"));
+  Object& val = Object::Handle();
+
+  const intptr_t classTableSize = 1 << RawObject::kClassIdTagSize;
+  for (intptr_t i = 0; i < classTableSize; i++) {
+    val = lib.Evaluate(expression, Array::empty_array(), Array::empty_array());
+  }
+
+  EXPECT(!val.IsNull());
+  EXPECT(!val.IsError());
+  EXPECT(val.IsInteger());
+  EXPECT_EQ(7, Integer::Cast(val).AsInt64Value());
+}
+
 }  // namespace dart