Add Instance::HashCode that matches hashCode.

runtime/vm/dart_entry.cc

 // 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.
 
 #include "vm/dart_entry.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/debugger.h"
@@ skipping 344 matching lines @@
   ASSERT(!function.IsNull());
   const Array& args = Array::Handle(Array::New(kNumArguments));
   args.SetAt(0, receiver);
   const Object& result = Object::Handle(DartEntry::InvokeFunction(function,
                                                                   args));
   ASSERT(result.IsInstance() || result.IsError());
   return result.raw();
 }
 
 
+RawObject* DartLibraryCalls::HashCode(const Instance& receiver) {
+  const int kNumArguments = 1;  // Receiver.
+  ArgumentsDescriptor args_desc(
+      Array::Handle(ArgumentsDescriptor::New(kNumArguments)));
+  const Function& function = Function::Handle(
+      Resolver::ResolveDynamic(receiver,
+                               Symbols::hashCode(),
+                               args_desc));
+  ASSERT(!function.IsNull());
+  const Array& args = Array::Handle(Array::New(kNumArguments));
+  args.SetAt(0, receiver);
+  const Object& result = Object::Handle(DartEntry::InvokeFunction(function,
+                                                                  args));
+  ASSERT(result.IsInstance() || result.IsError());
+  return result.raw();
+}
+
+
 RawObject* DartLibraryCalls::Equals(const Instance& left,
                                     const Instance& right) {
   const int kNumArguments = 2;
   ArgumentsDescriptor args_desc(
       Array::Handle(ArgumentsDescriptor::New(kNumArguments)));
   const Function& function = Function::Handle(
       Resolver::ResolveDynamic(left,
                                Symbols::EqualOperator(),
                                args_desc));
   ASSERT(!function.IsNull());
@@ skipping 88 matching lines @@
   const Array& args = Array::Handle(Array::New(kNumArguments));
   args.SetAt(0, map);
   args.SetAt(1, key);
   args.SetAt(2, value);
   const Object& result = Object::Handle(DartEntry::InvokeFunction(function,
                                                                   args));
   return result.raw();
 }
 
 }  // namespace dart