[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

src/compiler/common-operator.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_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/assembler.h"
 #include "src/compiler/frame-states.h"
 #include "src/machine-type.h"
@@ skipping 116 matching lines @@
  private:
   intptr_t value_;
   RelocInfo::Mode rmode_;
   Type type_;
 };
 
 bool operator==(RelocatablePtrConstantInfo const& lhs,
                 RelocatablePtrConstantInfo const& rhs);
 bool operator!=(RelocatablePtrConstantInfo const& lhs,
                 RelocatablePtrConstantInfo const& rhs);
+
 std::ostream& operator<<(std::ostream&, RelocatablePtrConstantInfo const&);
+
 size_t hash_value(RelocatablePtrConstantInfo 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).
+enum class RegionObservability : uint8_t { kObservable, kNotObservable };
+
+size_t hash_value(RegionObservability);
+
+std::ostream& operator<<(std::ostream&, RegionObservability);
+
+RegionObservability RegionObservabilityOf(Operator const*) WARN_UNUSED_RESULT;
+
 std::ostream& operator<<(std::ostream& os,
                          const ZoneVector<MachineType>* types);
 
 // Interface for building common operators that can be used at any level of IR,
 // including JavaScript, mid-level, and low-level.
 class CommonOperatorBuilder final : public ZoneObject {
  public:
   explicit CommonOperatorBuilder(Zone* zone);
 
   const Operator* Dead();
@@ skipping 33 matching lines @@
   const Operator* RelocatableInt32Constant(int32_t value,
                                            RelocInfo::Mode rmode);
   const Operator* RelocatableInt64Constant(int64_t value,
                                            RelocInfo::Mode rmode);
 
   const Operator* Select(MachineRepresentation, BranchHint = BranchHint::kNone);
   const Operator* Phi(MachineRepresentation representation,
                       int value_input_count);
   const Operator* EffectPhi(int effect_input_count);
   const Operator* Checkpoint();
-  const Operator* BeginRegion();
+  const Operator* BeginRegion(RegionObservability);
   const Operator* FinishRegion();
   const Operator* StateValues(int arguments);
   const Operator* ObjectState(int pointer_slots, int id);
   const Operator* TypedStateValues(const ZoneVector<MachineType>* types);
   const Operator* FrameState(BailoutId bailout_id,
                              OutputFrameStateCombine state_combine,
                              const FrameStateFunctionInfo* function_info);
   const Operator* Call(const CallDescriptor* descriptor);
   const Operator* TailCall(const CallDescriptor* descriptor);
   const Operator* Projection(size_t index);
@@ skipping 14 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_