Initial isolate reload support

runtime/vm/unit_test.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_UNIT_TEST_H_
 #define VM_UNIT_TEST_H_
 
 #include "include/dart_native_api.h"
 
 #include "platform/globals.h"
@@ skipping 268 matching lines @@
 class TestCase : TestCaseBase {
  public:
   typedef void (RunEntry)();
 
   TestCase(RunEntry* run, const char* name) : TestCaseBase(name), run_(run) { }
 
   static Dart_Handle LoadTestScript(const char* script,
                                     Dart_NativeEntryResolver resolver,
                                     const char* lib_uri = USER_TEST_URI,
                                     bool finalize = true);
-
   static Dart_Handle LoadCoreTestScript(const char* script,
                                         Dart_NativeEntryResolver resolver);
   static Dart_Handle lib();
   static const char* url() { return USER_TEST_URI; }
   static Dart_Isolate CreateTestIsolateFromSnapshot(
       uint8_t* buffer, const char* name = NULL) {
     return CreateIsolate(buffer, name);
   }
   static Dart_Isolate CreateTestIsolate(const char* name = NULL) {
     return CreateIsolate(bin::isolate_snapshot_buffer, name);
   }
   static Dart_Handle library_handler(Dart_LibraryTag tag,
                                      Dart_Handle library,
                                      Dart_Handle url);
   static char* BigintToHexValue(Dart_CObject* bigint);
 
   virtual void Run();
 
+  // Sets |script| to be the source used at next reload.
+  static void SetReloadTestScript(const char* script);
+  // Initiates the reload.
+  static Dart_Handle TriggerReload();
+  // Gets the result of a reload.
+  static Dart_Handle GetReloadErrorOrRootLibrary();
+
+  // Helper function which reloads the current isolate using |script|.
+  static Dart_Handle ReloadTestScript(const char* script);
+
  private:
   static Dart_Isolate CreateIsolate(const uint8_t* buffer, const char* name);
 
   RunEntry* const run_;
 };
 
 
 class TestIsolateScope {
  public:
   TestIsolateScope() {
@@ skipping 261 matching lines @@
 //    prefix = "classes"
 //    in = "\"id\":\"classes/46\""
 //
 // Yields:
 //
 //    out = "\"id\":\"\""
 //
 void ElideJSONSubstring(const char* prefix, const char* in, char* out);
 
 
+template<typename T>
+class SetFlagScope : public ValueObject {
+ public:
+  SetFlagScope(T* flag, T value)
+      : flag_(flag),
+        original_value_(*flag) {
+    *flag_ = value;
+  }
+
+  ~SetFlagScope() {
+    *flag_ = original_value_;
+  }
+
+ private:
+  T* flag_;
+  T original_value_;
+};
+
 }  // namespace dart
 
 #endif  // VM_UNIT_TEST_H_