Start checking inputs to dart api functions.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "vm/assert.h"
 #include "vm/dart.h"
 #include "vm/globals.h"
@@ skipping 1514 matching lines @@
 };
 
 
 class Library : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   void SetName(const String& name) const;
 
   RawString* url() const { return raw_ptr()->url_; }
   RawString* private_key() const { return raw_ptr()->private_key_; }
+  bool NotLoaded() const {

[siva, 2011/11/21 18:24:59]

The name NotLoaded() sounds like a negation of Loaded() but it is not quite a
pure negation.
How about NoLoadsIssued() or LoadNotIssued() or NoLoadsAttemptedYet()

[turnidge, 2011/11/21 18:52:16]

Going with LoadNotStarted for now.

+    return raw_ptr()->load_state_ == RawLibrary::kAllocated;
+  }
   bool LoadInProgress() const {
     return raw_ptr()->load_state_ == RawLibrary::kLoadInProgress;
   }
   void SetLoadInProgress() const;
   bool Loaded() const { return raw_ptr()->load_state_ == RawLibrary::kLoaded; }
   void SetLoaded() const;
   bool LoadError() const {
     return raw_ptr()->load_state_ == RawLibrary::kLoadError;
   }
   void SetLoadError() const;
@@ skipping 1688 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_