[turbofan] Machine operators are globally shared singletons.

src/compiler/pipeline.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/pipeline.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/compiler/ast-graph-builder.h"
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/code-generator.h"
@@ skipping 151 matching lines @@
   }
 
   // Build the graph.
   Graph graph(zone());
   SourcePositionTable source_positions(&graph);
   source_positions.AddDecorator();
   // TODO(turbofan): there is no need to type anything during initial graph
   // construction.  This is currently only needed for the node cache, which the
   // typer could sweep over later.
   Typer typer(zone());
+  MachineOperatorBuilder machine;
   CommonOperatorBuilder common(zone());
   JSGraph jsgraph(&graph, &common, &typer);
   Node* context_node;
   {
     PhaseStats graph_builder_stats(info(), PhaseStats::CREATE_GRAPH,
                                    "graph builder");
     AstGraphBuilderWithPositions graph_builder(info(), &jsgraph,
                                                &source_positions);
     graph_builder.CreateGraph();
     context_node = graph_builder.GetFunctionContext();
@@ skipping 67 matching lines @@
 
       VerifyAndPrintGraph(&graph, "Lowered simplified");
     }
     {
       // Lower changes that have been inserted before.
       PhaseStats lowering_stats(info(), PhaseStats::OPTIMIZATION,
                                 "change lowering");
       SourcePositionTable::Scope pos(&source_positions,
                                      SourcePosition::Unknown());
       Linkage linkage(info());
-      MachineOperatorBuilder machine(zone());
       ValueNumberingReducer vn_reducer(zone());
       SimplifiedOperatorReducer simple_reducer(&jsgraph, &machine);
       ChangeLowering lowering(&jsgraph, &linkage, &machine);
       MachineOperatorReducer mach_reducer(&jsgraph);
       GraphReducer graph_reducer(&graph);
       // TODO(titzer): Figure out if we should run all reducers at once here.
       graph_reducer.AddReducer(&vn_reducer);
       graph_reducer.AddReducer(&simple_reducer);
       graph_reducer.AddReducer(&lowering);
       graph_reducer.AddReducer(&mach_reducer);
       graph_reducer.ReduceGraph();
 
       VerifyAndPrintGraph(&graph, "Lowered changes");
     }
   }
 
   Handle<Code> code = Handle<Code>::null();
   if (SupportedTarget()) {
     {
       // Lower any remaining generic JSOperators.
       PhaseStats lowering_stats(info(), PhaseStats::CREATE_GRAPH,
                                 "generic lowering");
       SourcePositionTable::Scope pos(&source_positions,
                                      SourcePosition::Unknown());
-      MachineOperatorBuilder machine(zone());
       JSGenericLowering lowering(info(), &jsgraph, &machine);
       GraphReducer graph_reducer(&graph);
       graph_reducer.AddReducer(&lowering);
       graph_reducer.ReduceGraph();
 
       VerifyAndPrintGraph(&graph, "Lowered generic");
     }
 
     {
       // Compute a schedule.
@@ skipping 106 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8