[turbofan] Add a debug_name to Parameter operators.

src/compiler/common-operator.h

 // Copyright 2013 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/compiler/machine-type.h"
 #include "src/unique.h"
 
@@ skipping 138 matching lines @@
 bool operator!=(FrameStateCallInfo const&, FrameStateCallInfo const&);
 
 size_t hash_value(FrameStateCallInfo const&);
 
 std::ostream& operator<<(std::ostream&, FrameStateCallInfo const&);
 
 
 size_t ProjectionIndexOf(const Operator* const);
 
 
+// The {IrOpcode::kParameter} opcode represents an incoming parameter to the
+// function. This class bundles the index and a debug name for such operators.
+class ParameterInfo final {
+ public:
+  ParameterInfo(int index, const char* debug_name)
+      : index_(index), debug_name_(debug_name) {}
+
+  int index() const { return index_; }
+  const char* debug_name() const { return debug_name_; }
+
+ private:
+  int index_;
+  const char* debug_name_;
+};
+
+std::ostream& operator<<(std::ostream&, ParameterInfo const&);
+
+int ParameterIndexOf(const Operator* const);
+const ParameterInfo& ParameterInfoOf(const Operator* const);
+
+
 // 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);
 
   // Special operator used only in Branches to mark them as always taken, but
   // still unfoldable. This is required to properly connect non terminating
   // loops to end (in both the sea of nodes and the CFG).
   const Operator* Always();
 
   const Operator* Dead();
   const Operator* End();
   const Operator* Branch(BranchHint = BranchHint::kNone);
   const Operator* IfTrue();
   const Operator* IfFalse();
   const Operator* IfSuccess();
   const Operator* IfException();
   const Operator* Switch(size_t control_output_count);
   const Operator* IfValue(int32_t value);
   const Operator* IfDefault();
   const Operator* Throw();
   const Operator* Deoptimize();
   const Operator* Return();
 
   const Operator* Start(int num_formal_parameters);
   const Operator* Loop(int control_input_count);
   const Operator* Merge(int control_input_count);
-  const Operator* Parameter(int index);
+  const Operator* Parameter(int index, const char* debug_name = nullptr);
 
   const Operator* OsrNormalEntry();
   const Operator* OsrLoopEntry();
   const Operator* OsrValue(int index);
 
   const Operator* Int32Constant(int32_t);
   const Operator* Int64Constant(int64_t);
   const Operator* Float32Constant(volatile float);
   const Operator* Float64Constant(volatile double);
   const Operator* ExternalConstant(const ExternalReference&);
@@ skipping 26 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_