Cache hash code for closures.

runtime/lib/function.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 "vm/bootstrap_natives.h"
 
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
@@ skipping 51 matching lines @@
     }
   }
   return Bool::False().raw();
 }
 
 
 DEFINE_NATIVE_ENTRY(Closure_hashCode, 1) {
   const Closure& receiver =
       Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
   const Function& func = Function::Handle(receiver.function());
-  // Hash together name, class name and signature.
-  const Class& cls = Class::Handle(func.Owner());
-  intptr_t result = String::Handle(func.name()).Hash();
-  result += String::Handle(func.Signature()).Hash();
-  result += String::Handle(cls.Name()).Hash();
-  // Finalize hash value like for strings so that it fits into a smi.
-  result += result << 3;
-  result ^= result >> 11;
-  result += result << 15;
-  result &= ((static_cast<intptr_t>(1) << String::kHashBits) - 1);
-  return Smi::New(result);
+  return func.GetClosureHashCode();
 }
 
 
 DEFINE_NATIVE_ENTRY(Closure_clone, 1) {
   const Closure& receiver =
       Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
   const Function& func = Function::Handle(zone, receiver.function());
   const Context& ctx = Context::Handle(zone, receiver.context());
   Context& cloned_ctx =
       Context::Handle(zone, Context::New(ctx.num_variables()));
   cloned_ctx.set_parent(Context::Handle(zone, ctx.parent()));
   Object& inst = Object::Handle(zone);
   for (int i = 0; i < ctx.num_variables(); i++) {
     inst = ctx.At(i);
     cloned_ctx.SetAt(i, inst);
   }
   return Closure::New(func, cloned_ctx);
 }
 
 
 }  // namespace dart