VM: Explicitly load function and context before calling a closure.

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 840 matching lines @@
             info.inlined->ToQualifiedCString(),
             info.bailout_reason);
       }
     }
   }
 
   void InlineCall(InlinedCallData* call_data) {
     TimerScope timer(FLAG_compiler_stats,
                      &CompilerStats::graphinliner_subst_timer,
                      Isolate::Current());
-
-    // For closure calls: Store context value.
     FlowGraph* callee_graph = call_data->callee_graph;
     TargetEntryInstr* callee_entry =
         callee_graph->graph_entry()->normal_entry();
-    ClosureCallInstr* closure_call = call_data->call->AsClosureCall();
-    if (closure_call != NULL) {
-      // TODO(fschneider): Avoid setting the context, if not needed.
-      Definition* closure =
-          closure_call->PushArgumentAt(0)->value()->definition();
-      Definition* context = new LoadFieldInstr(new Value(closure),
-                                               Closure::context_offset(),
-                                               Type::ZoneHandle());
-      context->set_ssa_temp_index(caller_graph()->alloc_ssa_temp_index());
-      context->InsertAfter(callee_entry);
-      StoreContextInstr* set_context =
-          new StoreContextInstr(new Value(context));
-      set_context->InsertAfter(context);
-    }
-
     // Plug result in the caller graph.
     InlineExitCollector* exit_collector = call_data->exit_collector;
     exit_collector->PrepareGraphs(callee_graph);
     exit_collector->ReplaceCall(callee_entry);
 
     // Replace each stub with the actual argument or the caller's constant.
     // Nulls denote optional parameters for which no actual was given.
     GrowableArray<Value*>* arguments = call_data->arguments;
     for (intptr_t i = 0; i < arguments->length(); ++i) {
       Definition* stub = (*call_data->parameter_stubs)[i];
@@ skipping 798 matching lines @@
         OS::Print("After Inlining of %s\n", flow_graph_->
                   parsed_function().function().ToFullyQualifiedCString());
         FlowGraphPrinter printer(*flow_graph_);
         printer.PrintBlocks();
       }
     }
   }
 }
 
 }  // namespace dart