[turbofan] escape analysis supports arguments object and rest elements

src/compiler/simplified-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_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/base/compiler-specific.h"
@@ skipping 224 matching lines @@
   kNumberOrOddball,  // Inputs were Number or Oddball, output was Number.
 };
 
 size_t hash_value(NumberOperationHint);
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, NumberOperationHint);
 
 NumberOperationHint NumberOperationHintOf(const Operator* op)
     WARN_UNUSED_RESULT;
 
-int ParameterCountOf(const Operator* op) WARN_UNUSED_RESULT;
+int FormalParameterCountOf(const Operator* op) WARN_UNUSED_RESULT;
+bool IsRestLengthOf(const Operator* op) WARN_UNUSED_RESULT;
 
 PretenureFlag PretenureFlagOf(const Operator* op) WARN_UNUSED_RESULT;
 
 UnicodeEncoding UnicodeEncodingOf(const Operator*) WARN_UNUSED_RESULT;
 
 // Interface for building simplified operators, which represent the
 // medium-level operations of V8, including adding numbers, allocating objects,
 // indexing into objects and arrays, etc.
 // All operators are typed but many are representation independent.
 
@@ skipping 156 matching lines @@
   const Operator* ConvertTaggedHoleToUndefined();
 
   const Operator* ObjectIsDetectableCallable();
   const Operator* ObjectIsNonCallable();
   const Operator* ObjectIsNumber();
   const Operator* ObjectIsReceiver();
   const Operator* ObjectIsSmi();
   const Operator* ObjectIsString();
   const Operator* ObjectIsUndetectable();
 
-  // new-rest-parameter-elements
-  const Operator* NewRestParameterElements(int parameter_count);
+  const Operator* ArgumentsFrame();
+  const Operator* ArgumentsLength(int formal_parameter_count,
+                                  bool is_rest_length);
 
   // new-unmapped-arguments-elements
-  const Operator* NewUnmappedArgumentsElements(int parameter_count);
+  const Operator* NewUnmappedArgumentsElements();
 
   // array-buffer-was-neutered buffer
   const Operator* ArrayBufferWasNeutered();
 
   // ensure-writable-fast-elements object, elements
   const Operator* EnsureWritableFastElements();
 
   // maybe-grow-fast-elements object, elements, index, length
   const Operator* MaybeGrowFastElements(GrowFastElementsFlags flags);
 
@@ skipping 30 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_