Deprecte LoweringBuilder in favor of Reducer.

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/code-generator.h"
 #include "src/compiler/graph-replay.h"
@@ skipping 193 matching lines @@
       // Type the graph.
       PhaseStats typer_stats(info(), PhaseStats::CREATE_GRAPH, "typer");
       typer.Run(&graph, info()->context());
     }
     // All new nodes must be typed.
     typer.DecorateGraph(&graph);
     {
       // Lower JSOperators where we can determine types.
       PhaseStats lowering_stats(info(), PhaseStats::CREATE_GRAPH,
                                 "typed lowering");
-      JSTypedLowering lowering(&jsgraph, &source_positions);
-      lowering.LowerAllNodes();
+      SourcePositionTable::Scope pos(&source_positions,
+                                     SourcePosition::Unknown());
+      JSTypedLowering lowering(&jsgraph);
+      GraphReducer graph_reducer(&graph);
+      graph_reducer.AddReducer(&lowering);
+      graph_reducer.ReduceGraph();
 
       VerifyAndPrintGraph(&graph, "Lowered typed");
     }
   }
 
   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, &source_positions);
-      lowering.LowerAllNodes();
+      JSGenericLowering lowering(info(), &jsgraph, &machine);
+      GraphReducer graph_reducer(&graph);
+      graph_reducer.AddReducer(&lowering);
+      graph_reducer.ReduceGraph();
 
       VerifyAndPrintGraph(&graph, "Lowered generic");
     }
 
     // Compute a schedule.
     Schedule* schedule = ComputeSchedule(&graph);
     TraceSchedule(schedule);
 
     {
       // Generate optimized code.
@@ skipping 101 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8