[turbofan] Introduce JSCallForwardVarargs operator.

src/compiler/js-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_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
 #include "src/runtime/runtime.h"
@@ skipping 88 matching lines @@
                 CallConstructWithSpreadParameters const&);
 
 size_t hash_value(CallConstructWithSpreadParameters const&);
 
 std::ostream& operator<<(std::ostream&,
                          CallConstructWithSpreadParameters const&);
 
 CallConstructWithSpreadParameters const& CallConstructWithSpreadParametersOf(
     Operator const*);
 
+// Defines the flags for a JavaScript call forwarding parameters. This
+// is used as parameter by JSCallForwardVarargs operators.
+class CallForwardVarargsParameters final {
+ public:
+  CallForwardVarargsParameters(uint32_t start_index,
+                               TailCallMode tail_call_mode)
+      : bit_field_(StartIndexField::encode(start_index) |
+                   TailCallModeField::encode(tail_call_mode)) {}
+
+  uint32_t start_index() const { return StartIndexField::decode(bit_field_); }
+  TailCallMode tail_call_mode() const {
+    return TailCallModeField::decode(bit_field_);
+  }
+
+  bool operator==(CallForwardVarargsParameters const& that) const {
+    return this->bit_field_ == that.bit_field_;
+  }
+  bool operator!=(CallForwardVarargsParameters const& that) const {
+    return !(*this == that);
+  }
+
+ private:
+  friend size_t hash_value(CallForwardVarargsParameters const& p) {
+    return p.bit_field_;
+  }
+
+  typedef BitField<uint32_t, 0, 30> StartIndexField;
+  typedef BitField<TailCallMode, 31, 1> TailCallModeField;
+
+  uint32_t const bit_field_;
+};
+
+std::ostream& operator<<(std::ostream&, CallForwardVarargsParameters const&);
+
+CallForwardVarargsParameters const& CallForwardVarargsParametersOf(
+    Operator const*) WARN_UNUSED_RESULT;
+
 // Defines the arity and the call flags for a JavaScript function call. This is
 // used as a parameter by JSCallFunction operators.
 class CallFunctionParameters final {
  public:
   CallFunctionParameters(size_t arity, float frequency,
                          VectorSlotPair const& feedback,
                          TailCallMode tail_call_mode,
                          ConvertReceiverMode convert_mode)
       : bit_field_(ArityField::encode(arity) |
                    ConvertReceiverModeField::encode(convert_mode) |
@@ skipping 446 matching lines @@
   const Operator* CreateKeyValueArray();
   const Operator* CreateLiteralArray(Handle<ConstantElementsPair> constant,
                                      int literal_flags, int literal_index,
                                      int number_of_elements);
   const Operator* CreateLiteralObject(Handle<FixedArray> constant_properties,
                                       int literal_flags, int literal_index,
                                       int number_of_properties);
   const Operator* CreateLiteralRegExp(Handle<String> constant_pattern,
                                       int literal_flags, int literal_index);
 
+  const Operator* CallForwardVarargs(uint32_t start_index,
+                                     TailCallMode tail_call_mode);
   const Operator* CallFunction(
       size_t arity, float frequency = 0.0f,
       VectorSlotPair const& feedback = VectorSlotPair(),
       ConvertReceiverMode convert_mode = ConvertReceiverMode::kAny,
       TailCallMode tail_call_mode = TailCallMode::kDisallow);
   const Operator* CallFunctionWithSpread(uint32_t arity);
   const Operator* CallRuntime(Runtime::FunctionId id);
   const Operator* CallRuntime(Runtime::FunctionId id, size_t arity);
   const Operator* CallRuntime(const Runtime::Function* function, size_t arity);
   const Operator* CallConstruct(uint32_t arity, float frequency,
@@ skipping 66 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_