Closure call inlining for constant closures.

runtime/vm/flow_graph_inliner.cc

 // Copyright (c) 2013, 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/flow_graph_inliner.h"
 
 #include "vm/block_scheduler.h"
 #include "vm/compiler.h"
 #include "vm/flags.h"
 #include "vm/flow_graph.h"
@@ skipping 1001 matching lines @@
       ClosureCallInstr* call = call_info[call_idx].call;
       // Find the closure of the callee.
       ASSERT(call->ArgumentCount() > 0);
       Function& target = Function::ZoneHandle();
       AllocateObjectInstr* alloc =
           call->ArgumentAt(0)->OriginalDefinition()->AsAllocateObject();
       if ((alloc != NULL) && !alloc->closure_function().IsNull()) {
         target ^= alloc->closure_function().raw();
         ASSERT(target.signature_class() == alloc->cls().raw());
       }
+      ConstantInstr* constant =
+          call->ArgumentAt(0)->OriginalDefinition()->AsConstant();
+      if ((constant != NULL) &&
+          constant->value().IsInstance() &&
+          Instance::Cast(constant->value()).IsClosure()) {
+        target ^= Closure::function(Instance::Cast(constant->value()));
+      }
+
       if (target.IsNull()) {
         TRACE_INLINING(OS::Print("     Bailout: non-closure operator\n"));
         continue;
       }
       GrowableArray<Value*> arguments(call->ArgumentCount());
       for (int i = 0; i < call->ArgumentCount(); ++i) {
         arguments.Add(call->PushArgumentAt(i)->value());
       }
       InlinedCallData call_data(call, &arguments, *call_info[call_idx].caller);
       if (TryInlining(target,
@@ skipping 686 matching lines @@
         OS::Print("After Inlining of %s\n", flow_graph_->
                   parsed_function().function().ToFullyQualifiedCString());
         FlowGraphPrinter printer(*flow_graph_);
         printer.PrintBlocks();
       }
     }
   }
 }
 
 }  // namespace dart