Lazy loading of deferred libraries

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 737 matching lines @@
 
   intptr_t line_offset_;
   intptr_t col_offset_;
   int8_t kind_;  // Of type Kind.
 };
 
 
 class RawLibrary : public RawObject {
   enum LibraryState {
     kAllocated,       // Initial state.
+    kLoadRequested,   // Compiler or script requested load of library.
     kLoadInProgress,  // Library is in the process of being loaded.
     kLoaded,          // Library is loaded.
     kLoadError,       // Error occurred during load of the Library.
   };
 
   RAW_HEAP_OBJECT_IMPLEMENTATION(Library);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;
   RawString* url_;
@@ skipping 372 matching lines @@
   RAW_HEAP_OBJECT_IMPLEMENTATION(Instance);
 };
 
 
 class RawLibraryPrefix : public RawInstance {
   RAW_HEAP_OBJECT_IMPLEMENTATION(LibraryPrefix);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;               // Library prefix name.
   RawArray* imports_;             // Libraries imported with this prefix.
+  RawLibrary* importer_;          // Library which declares this prefix.
   RawArray* dependent_code_;      // Code that refers to deferred, unloaded
                                   // library prefix.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->dependent_code_);
   }
   intptr_t num_imports_;          // Number of library entries in libraries_.
   bool is_deferred_load_;
   bool is_loaded_;
 };
 
@@ skipping 696 matching lines @@
   COMPILE_ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kNullCid == kExternalTypedDataInt8ArrayCid + 14);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_