Only reload libraries when they may have been modified.

runtime/bin/dartutils.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 "bin/dartutils.h"
 
 #include "bin/crypto.h"
 #include "bin/directory.h"
 #include "bin/extensions.h"
 #include "bin/file.h"
@@ skipping 416 matching lines @@
                         " on the stand-alone VM. Trying to load"
                         " '%s'.\n", library_url_string, url_string);
       }
       // Prepend the library URI to form a unique script URI for the part.
       intptr_t len = snprintf(NULL, 0, "%s/%s", library_url_string, url_string);
       char* part_uri = reinterpret_cast<char*>(malloc(len + 1));
       snprintf(part_uri, len + 1, "%s/%s", library_url_string, url_string);
       Dart_Handle part_uri_obj = DartUtils::NewString(part_uri);
       free(part_uri);
       return Dart_LoadSource(library,
-                             part_uri_obj,
+                             part_uri_obj, Dart_Null(),
                              Builtin::PartSource(id, url_string), 0, 0);
     }
     // All cases should have been handled above.
     UNREACHABLE();
   }
 
   if (DartUtils::IsDartExtensionSchemeURL(url_string)) {
     // Load a native code shared library to use in a native extension
     if (tag != Dart_kImportTag) {
       return NewError("Dart extensions must use import: '%s'", url_string);
@@ skipping 115 matching lines @@
         DartUtils::SniffForMagicNumber(data, &num_bytes, &is_snapshot);
 
     if (is_snapshot) {
       result = Dart_LoadScriptFromSnapshot(payload, num_bytes);
     } else {
       Dart_Handle source = Dart_NewStringFromUTF8(data, num_bytes);
       if (Dart_IsError(source)) {
         result = DartUtils::NewError("%s is not a valid UTF-8 script",
                                      resolved_script_uri);
       } else {
-        result = Dart_LoadScript(resolved_script_uri, source, 0, 0);
+        result = Dart_LoadScript(resolved_script_uri, Dart_Null(),
+                                 source, 0, 0);
       }
     }
   } else {
     int64_t tag = DartUtils::GetIntegerValue(tag_in);
 
     Dart_Handle source = Dart_NewStringFromUTF8(data, num_bytes);
     if (Dart_IsError(source)) {
       result = DartUtils::NewError("%s is not a valid UTF-8 script",
                                    resolved_script_uri);
     } else {
       if (tag == Dart_kImportTag) {
-        result = Dart_LoadLibrary(resolved_script_uri, source, 0, 0);
+        result = Dart_LoadLibrary(resolved_script_uri, Dart_Null(),
+                                  source, 0, 0);
       } else {
         ASSERT(tag == Dart_kSourceTag);
         Dart_Handle library = Dart_LookupLibrary(library_uri);
         if (Dart_IsError(library)) {
           Dart_PropagateError(library);
         }
-        result = Dart_LoadSource(library, resolved_script_uri, source, 0, 0);
+        result = Dart_LoadSource(library, resolved_script_uri, Dart_Null(),
+                                 source, 0, 0);
       }
     }
   }
 
   if (buffer_copy != NULL) {
     free(buffer_copy);
   }
 
   if (Dart_IsError(result)) {
     Dart_PropagateError(result);
@@ skipping 657 matching lines @@
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }
 
 }  // namespace bin
 }  // namespace dart