VM: Don't do inline context allocation in precompiled code.

runtime/vm/aot_optimizer.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/aot_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/branch_optimizer.h"
 #include "vm/cha.h"
 #include "vm/compiler.h"
@@ skipping 2694 matching lines @@
             default:
               break;
           }
         }
       }
     }
   }
 }
 
 
-void AotOptimizer::VisitAllocateContext(AllocateContextInstr* instr) {
-  // Replace generic allocation with a sequence of inlined allocation and
-  // explicit initalizing stores.
-  AllocateUninitializedContextInstr* replacement =
-      new AllocateUninitializedContextInstr(instr->token_pos(),
-                                            instr->num_context_variables());
-  instr->ReplaceWith(replacement, current_iterator());
-
-  StoreInstanceFieldInstr* store =
-      new(Z) StoreInstanceFieldInstr(Context::parent_offset(),
-                                     new Value(replacement),
-                                     new Value(flow_graph_->constant_null()),
-                                     kNoStoreBarrier,
-                                     instr->token_pos());
-  // Storing into uninitialized memory; remember to prevent dead store
-  // elimination and ensure proper GC barrier.
-  store->set_is_object_reference_initialization(true);
-  flow_graph_->InsertAfter(replacement, store, NULL, FlowGraph::kEffect);
-  Definition* cursor = store;
-  for (intptr_t i = 0; i < instr->num_context_variables(); ++i) {
-    store =
-        new(Z) StoreInstanceFieldInstr(Context::variable_offset(i),
-                                       new Value(replacement),
-                                       new Value(flow_graph_->constant_null()),
-                                       kNoStoreBarrier,
-                                       instr->token_pos());
-    // Storing into uninitialized memory; remember to prevent dead store
-    // elimination and ensure proper GC barrier.
-    store->set_is_object_reference_initialization(true);
-    flow_graph_->InsertAfter(cursor, store, NULL, FlowGraph::kEffect);
-    cursor = store;
-  }
-}
-
-
 void AotOptimizer::VisitLoadCodeUnits(LoadCodeUnitsInstr* instr) {
   // TODO(zerny): Use kUnboxedUint32 once it is fully supported/optimized.
 #if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_ARM)
   if (!instr->can_pack_into_smi())
     instr->set_representation(kUnboxedMint);
 #endif
 }
 
 
 bool AotOptimizer::TryInlineInstanceSetter(InstanceCallInstr* instr,
@@ skipping 47 matching lines @@
 
   // Discard the environment from the original instruction because the store
   // can't deoptimize.
   instr->RemoveEnvironment();
   ReplaceCall(instr, store);
   return true;
 }
 
 
 }  // namespace dart