[turbofan] Initial version of number type feedback.

src/compiler/simplified-lowering.h

 // 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.
 
 #ifndef V8_COMPILER_SIMPLIFIED_LOWERING_H_
 #define V8_COMPILER_SIMPLIFIED_LOWERING_H_
 
+#include "src/base/flags.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class TypeCache;
 
 
 namespace compiler {
 
 // Forward declarations.
 class RepresentationChanger;
 class RepresentationSelector;
 class SourcePositionTable;
 
 class SimplifiedLowering final {
  public:
+  enum Flag { kNoFlag = 0u, kTypeFeedbackEnabled = 1u << 0 };
+  typedef base::Flags<Flag> Flags;
   SimplifiedLowering(JSGraph* jsgraph, Zone* zone,
-                     SourcePositionTable* source_positions);
+                     SourcePositionTable* source_positions,
+                     Flags flags = kNoFlag);
   ~SimplifiedLowering() {}
 
   void LowerAllNodes();
 
   void DoJSToNumberTruncatesToFloat64(Node* node,
                                       RepresentationSelector* selector);
   void DoJSToNumberTruncatesToWord32(Node* node,
                                      RepresentationSelector* selector);
   // TODO(turbofan): The representation can be removed once the result of the
   // representation analysis is stored in the node bounds.
   void DoLoadBuffer(Node* node, MachineRepresentation rep,
                     RepresentationChanger* changer);
   void DoStoreBuffer(Node* node);
   void DoShift(Node* node, Operator const* op, Type* rhs_type);
 
+  Flags flags() const { return flags_; }
+
  private:
   JSGraph* const jsgraph_;
   Zone* const zone_;
   TypeCache const& type_cache_;
   SetOncePointer<Node> to_number_code_;
   SetOncePointer<Operator const> to_number_operator_;
+  Flags flags_;
 
   // TODO(danno): SimplifiedLowering shouldn't know anything about the source
   // positions table, but must for now since there currently is no other way to
   // pass down source position information to nodes created during
   // lowering. Once this phase becomes a vanilla reducer, it should get source
   // position information via the SourcePositionWrapper like all other reducers.
   SourcePositionTable* source_positions_;
 
   Node* Float64Ceil(Node* const node);
   Node* Float64Floor(Node* const node);
@@ skipping 16 matching lines @@
   CommonOperatorBuilder* common() { return jsgraph()->common(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
   SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_LOWERING_H_