In precompilation, finalize all classes eagerly. Use the stable class hierarchy for doing CHA based…

runtime/vm/precompiler.cc

 // Copyright (c) 2015, 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 "vm/precompiler.h"
 
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/isolate.h"
 #include "vm/log.h"
 #include "vm/longjump.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/resolver.h"
 #include "vm/symbols.h"
 
 namespace dart {
 
 
+#define T (thread())
 #define I (isolate())
 #define Z (zone())
 
 
 DEFINE_FLAG(bool, trace_precompiler, false, "Trace precompiler.");
 
 
 static void Jump(const Error& error) {
   Thread::Current()->long_jump_base()->Jump(1, error);
 }
@@ skipping 36 matching lines @@
   I->set_collected_closures(collected_closures_);
 }
 
 
 void Precompiler::DoCompileAll(
     Dart_QualifiedFunctionName embedder_entry_points[]) {
   // Drop all existing code so we can use the presence of code as an indicator
   // that we have already looked for the function's callees.
   ClearAllCode();
 
+  // Make sure class hierarchy is stable before compilation so that CHA
+  // can be used.
+  FinalizeAllClasses();
+
   // Start with the allocations and invocations that happen from C++.
   AddRoots(embedder_entry_points);
 
   // TODO(rmacnak): Eagerly add field-invocation functions to all signature
   // classes so closure calls don't go through the runtime.
 
   // Compile newly found targets and add their callees until we reach a fixed
   // point.
   Iterate();
 
@@ skipping 731 matching lines @@
       if (!closures.IsNull()) {
         for (intptr_t j = 0; j < closures.Length(); j++) {
           function ^= closures.At(j);
           visitor->VisitFunction(function);
         }
       }
     }
   }
 }
 
+
+void Precompiler::FinalizeAllClasses() {
+  Library& lib = Library::Handle(Z);
+  Class& cls = Class::Handle(Z);
+
+  for (intptr_t i = 0; i < libraries_.Length(); i++) {
+    lib ^= libraries_.At(i);
+    ClassDictionaryIterator it(lib, ClassDictionaryIterator::kIteratePrivate);
+    while (it.HasNext()) {
+      cls = it.GetNextClass();
+      if (cls.IsDynamicClass()) {
+        continue;  // class 'dynamic' is in the read-only VM isolate.
+      }
+      cls.EnsureIsFinalized(T);
+    }
+  }
+  I->set_all_classes_finalized(true);
+}
+
+
 }  // namespace dart