Add ability for Function to generate source

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 32 matching lines @@
   Library& lib = Library::Handle(Library::CoreLibrary());
   EXPECT(CompilerTest::TestCompileScript(lib, script));
   EXPECT(ClassFinalizer::FinalizePendingClasses());
   Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(Symbols::New("A"))));
   EXPECT(!cls.IsNull());
   String& function_foo_name = String::Handle(String::New("foo"));
   Function& function_foo =
       Function::Handle(cls.LookupStaticFunction(function_foo_name));
   EXPECT(!function_foo.IsNull());
-
+  String& function_source = String::Handle(function_foo.GetSource());
+  EXPECT_STREQ("static foo() { return 42; }\n  ", function_source.ToCString());
   EXPECT(CompilerTest::TestCompileFunction(function_foo));
   EXPECT(function_foo.HasCode());
 
   String& function_moo_name = String::Handle(String::New("moo"));
   Function& function_moo =
       Function::Handle(cls.LookupStaticFunction(function_moo_name));
   EXPECT(!function_moo.IsNull());
 
   EXPECT(CompilerTest::TestCompileFunction(function_moo));
   EXPECT(function_moo.HasCode());
+  function_source = function_moo.GetSource();
+  EXPECT_STREQ("static moo() {\n    // A.foo();\n  }\n",
+               function_source.ToCString());
 }
 
 
 TEST_CASE(EvalExpression) {
   const char* kScriptChars =
       "int ten = 2 * 5;              \n"
       "get dot => '.';               \n"
       "class A {                     \n"
       "  var apa = 'Herr Nilsson';   \n"
       "  calc(x) => '${x*ten}';      \n"
@@ skipping 13 matching lines @@
   expr_text = String::New("apa + ' ${calc(10)}' + dot");
   Object& val = Object::Handle();
   val = Instance::Cast(obj).Evaluate(expr_text);
   EXPECT(!val.IsNull());
   EXPECT(!val.IsError());
   EXPECT(val.IsString());
   EXPECT_STREQ("Herr Nilsson 100.", val.ToCString());
 }
 
 }  // namespace dart