[turbofan]: Improved source position information

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 4d5982aa460dc348ecf0870a2ac9a701bad93c61..f2316f2049d4a208e56aa54a71ff70ba40ed111d 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -290,11 +290,11 @@ class AstGraphBuilderWithPositions : public AstGraphBuilder {
                                LoopAssignmentAnalysis* loop_assignment,
                                SourcePositionTable* source_positions)
       : AstGraphBuilder(local_zone, info, jsgraph, loop_assignment),
-        source_positions_(source_positions) {}
+        source_positions_(source_positions),
+        start_position_(info->shared_info()->start_position()) {}
 
   bool CreateGraph() {
-    SourcePositionTable::Scope pos(source_positions_,
-                                   SourcePosition::Unknown());
+    SourcePositionTable::Scope pos_scope(source_positions_, start_position_);
     return AstGraphBuilder::CreateGraph();
   }
 
@@ -311,9 +311,50 @@ class AstGraphBuilderWithPositions : public AstGraphBuilder {
 
  private:
   SourcePositionTable* source_positions_;
+  SourcePosition start_position_;
+};
+
+
+namespace {
+
+class SourcePositionWrapper : public Reducer {
+ public:
+  // Allocate SourcePositionWrapper can't inherit from ZoneObject due to code
+  // style multiple-inheritance restrictions.
+  void* operator new(size_t size, Zone* zone) {
+    return zone->New(static_cast<int>(size));
+  }
+
+  SourcePositionWrapper(Reducer* reducer, SourcePositionTable* table)
+      : reducer_(reducer), table_(table) {}
+  virtual ~SourcePositionWrapper() {}
+
+  virtual Reduction Reduce(Node* node) {
+    SourcePosition pos = table_->GetSourcePosition(node);
+    SourcePositionTable::Scope position(table_, pos);
+    return reducer_->Reduce(node);
+  }
+
+ private:
+  Reducer* reducer_;
+  SourcePositionTable* table_;
+
+  DISALLOW_COPY_AND_ASSIGN(SourcePositionWrapper);
 };
 
 
+static void AddReducer(PipelineData* data, GraphReducer* graph_reducer,
+                       Reducer* reducer) {
+  if (FLAG_turbo_source_positions) {
+    SourcePositionWrapper* wrapper = new (data->graph_zone())
+        SourcePositionWrapper(reducer, data->source_positions());
+    graph_reducer->AddReducer(wrapper);
+  } else {
+    graph_reducer->AddReducer(reducer);
+  }
+}
+};
+
 class PipelineRunScope {
  public:
   PipelineRunScope(PipelineData* data, const char* phase_name)
@@ -382,7 +423,7 @@ struct ContextSpecializerPhase {
     JSContextSpecializer spec(data->info(), data->jsgraph(),
                               data->context_node());
     GraphReducer graph_reducer(data->graph(), temp_zone);
-    graph_reducer.AddReducer(&spec);
+    AddReducer(data, &graph_reducer, &spec);
     graph_reducer.ReduceGraph();
   }
 };
@@ -435,13 +476,13 @@ struct TypedLoweringPhase {
     SimplifiedOperatorReducer simple_reducer(data->jsgraph());
     CommonOperatorReducer common_reducer;
     GraphReducer graph_reducer(data->graph(), temp_zone);
-    graph_reducer.AddReducer(&vn_reducer);
-    graph_reducer.AddReducer(&builtin_reducer);
-    graph_reducer.AddReducer(&typed_lowering);
-    graph_reducer.AddReducer(&intrinsic_lowering);
-    graph_reducer.AddReducer(&load_elimination);
-    graph_reducer.AddReducer(&simple_reducer);
-    graph_reducer.AddReducer(&common_reducer);
+    AddReducer(data, &graph_reducer, &vn_reducer);
+    AddReducer(data, &graph_reducer, &builtin_reducer);
+    AddReducer(data, &graph_reducer, &typed_lowering);
+    AddReducer(data, &graph_reducer, &intrinsic_lowering);
+    AddReducer(data, &graph_reducer, &load_elimination);
+    AddReducer(data, &graph_reducer, &simple_reducer);
+    AddReducer(data, &graph_reducer, &common_reducer);
     graph_reducer.ReduceGraph();
   }
 };
@@ -453,17 +494,18 @@ struct SimplifiedLoweringPhase {
   void Run(PipelineData* data, Zone* temp_zone) {
     SourcePositionTable::Scope pos(data->source_positions(),
                                    SourcePosition::Unknown());
-    SimplifiedLowering lowering(data->jsgraph(), temp_zone);
+    SimplifiedLowering lowering(data->jsgraph(), temp_zone,
+                                data->source_positions());
     lowering.LowerAllNodes();
     ValueNumberingReducer vn_reducer(temp_zone);
     SimplifiedOperatorReducer simple_reducer(data->jsgraph());
     MachineOperatorReducer machine_reducer(data->jsgraph());
     CommonOperatorReducer common_reducer;
     GraphReducer graph_reducer(data->graph(), temp_zone);
-    graph_reducer.AddReducer(&vn_reducer);
-    graph_reducer.AddReducer(&simple_reducer);
-    graph_reducer.AddReducer(&machine_reducer);
-    graph_reducer.AddReducer(&common_reducer);
+    AddReducer(data, &graph_reducer, &vn_reducer);
+    AddReducer(data, &graph_reducer, &simple_reducer);
+    AddReducer(data, &graph_reducer, &machine_reducer);
+    AddReducer(data, &graph_reducer, &common_reducer);
     graph_reducer.ReduceGraph();
   }
 };
@@ -483,10 +525,10 @@ struct ChangeLoweringPhase {
     CommonOperatorReducer common_reducer;
     GraphReducer graph_reducer(data->graph(), temp_zone);
     graph_reducer.AddReducer(&vn_reducer);
-    graph_reducer.AddReducer(&simple_reducer);
-    graph_reducer.AddReducer(&lowering);
-    graph_reducer.AddReducer(&machine_reducer);
-    graph_reducer.AddReducer(&common_reducer);
+    AddReducer(data, &graph_reducer, &simple_reducer);
+    AddReducer(data, &graph_reducer, &lowering);
+    AddReducer(data, &graph_reducer, &machine_reducer);
+    AddReducer(data, &graph_reducer, &common_reducer);
     graph_reducer.ReduceGraph();
   }
 };
@@ -537,8 +579,8 @@ struct GenericLoweringPhase {
     JSGenericLowering generic(data->info(), data->jsgraph());
     SelectLowering select(data->jsgraph()->graph(), data->jsgraph()->common());
     GraphReducer graph_reducer(data->graph(), temp_zone);
-    graph_reducer.AddReducer(&generic);
-    graph_reducer.AddReducer(&select);
+    AddReducer(data, &graph_reducer, &generic);
+    AddReducer(data, &graph_reducer, &select);
     graph_reducer.ReduceGraph();
   }
 };