Only reload libraries when they may have been modified.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3367 matching lines @@
                             void *peer);
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(TokenStream, Object);
   friend class Class;
 };
 
 
 class Script : public Object {
  public:
   RawString* url() const { return raw_ptr()->url_; }
+
+  // The actual url which was loaded from disk, if provided by the embedder.
+  RawString* resolved_url() const { return raw_ptr()->resolved_url_; }
   bool HasSource() const;
   RawString* Source() const;
   RawString* GenerateSource() const;  // Generates source code from Tokenstream.
   RawGrowableObjectArray* GenerateLineNumberArray() const;
   RawScript::Kind kind() const {
     return static_cast<RawScript::Kind>(raw_ptr()->kind_);
   }
   const char* GetKindAsCString() const;
   intptr_t line_offset() const { return raw_ptr()->line_offset_; }
   intptr_t col_offset() const { return raw_ptr()->col_offset_; }
@@ skipping 35 matching lines @@
                         TokenPosition* last_token_index) const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawScript));
   }
 
   static RawScript* New(const String& url,
                         const String& source,
                         RawScript::Kind kind);
 
+  static RawScript* New(const String& url,
+                        const String& resolved_url,
+                        const String& source,
+                        RawScript::Kind kind);
+
  private:
   void set_url(const String& value) const;
+  void set_resolved_url(const String& value) const;
   void set_source(const String& value) const;
   void set_kind(RawScript::Kind value) const;
   void set_load_timestamp(int64_t value) const;
   void set_tokens(const TokenStream& value) const;
 
   static RawScript* New();
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Script, Object);
   friend class Class;
   friend class Precompiler;
@@ skipping 5246 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_