[turbofan] Sparse representation for state values

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 1f258a0ec0fa95dce529d8c857e6d275f104907e..5bf893e63e6868713590a2c2539069832b4c75c0 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -158,6 +158,29 @@ std::ostream& operator<<(std::ostream&, RelocatablePtrConstantInfo const&);
 
 size_t hash_value(RelocatablePtrConstantInfo const& p);
 
+class TypedStateValueInfo final {
+ public:
+  TypedStateValueInfo(ZoneVector<MachineType> const* machine_types,
+                      uint32_t mask)
+      : machine_types_(machine_types), mask_(mask) {}
+
+  ZoneVector<MachineType> const* machine_types() const {
+    return machine_types_;
+  }
+  uint32_t mask() const { return mask_; }
+
+ private:
+  ZoneVector<MachineType> const* machine_types_;
+  uint32_t mask_;

[Jarin, 2016/12/07 08:56:20]

This is a poor name - could you come with a name that describes what the mask
means?

[Leszek Swirski, 2016/12/08 15:44:30]

Hm, the only thing I could think of is to expand it to its new type name,
sparse_input_mask. WDYT?

+};
+
+bool operator==(TypedStateValueInfo const& lhs, TypedStateValueInfo const& rhs);
+bool operator!=(TypedStateValueInfo const& lhs, TypedStateValueInfo const& rhs);
+
+std::ostream& operator<<(std::ostream&, TypedStateValueInfo const&);
+
+size_t hash_value(TypedStateValueInfo const& p);
+
 // Used to mark a region (as identified by BeginRegion/FinishRegion) as either
 // JavaScript-observable or not (i.e. allocations are not JavaScript observable
 // themselves, but transitioning stores are).
@@ -243,8 +266,9 @@ class V8_EXPORT_PRIVATE CommonOperatorBuilder final
   const Operator* Checkpoint();
   const Operator* BeginRegion(RegionObservability);
   const Operator* FinishRegion();
-  const Operator* StateValues(int arguments);
-  const Operator* TypedStateValues(const ZoneVector<MachineType>* types);
+  const Operator* StateValues(int arguments, uint32_t bitmask);
+  const Operator* TypedStateValues(const ZoneVector<MachineType>* types,
+                                   uint32_t bitmask);
   const Operator* ObjectState(int pointer_slots);
   const Operator* TypedObjectState(const ZoneVector<MachineType>* types);
   const Operator* FrameState(BailoutId bailout_id,