[turbofan] Avoid going through ArgumentsAdaptorTrampoline for CSA/C++ builtins

src/code-stub-assembler.h

 // Copyright 2016 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_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 1438 matching lines @@
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 class CodeStubArguments {
  public:
   typedef compiler::Node Node;
 
   // |argc| is an uint32 value which specifies the number of arguments passed
   // to the builtin excluding the receiver.
   CodeStubArguments(CodeStubAssembler* assembler, Node* argc)

[Igor Sheludko, 2017/04/27 10:38:05]

While you are here please update the comment. It looks like this constructor
expects |argc| as an intptr value and the second expects |argc| according to
given |param_mode|.

[danno, 2017/04/28 06:58:10]

Done.

       : CodeStubArguments(assembler, argc, nullptr,
                           CodeStubAssembler::INTPTR_PARAMETERS) {}
   CodeStubArguments(CodeStubAssembler* assembler, Node* argc, Node* fp,
                     CodeStubAssembler::ParameterMode param_mode);
 
   Node* GetReceiver() const;
 
   Node* AtIndexPtr(Node* index, CodeStubAssembler::ParameterMode mode =
                                     CodeStubAssembler::INTPTR_PARAMETERS) const;
 
   // |index| is zero-based and does not include the receiver
   Node* AtIndex(Node* index, CodeStubAssembler::ParameterMode mode =
                                  CodeStubAssembler::INTPTR_PARAMETERS) const;
 
   Node* AtIndex(int index) const;
 
+  Node* GetOptionalArgumentValue(int index, Node* default_value);
+
   Node* GetLength() const { return argc_; }
 
   typedef std::function<void(Node* arg)> ForEachBodyFunction;
 
   // Iteration doesn't include the receiver. |first| and |last| are zero-based.
   void ForEach(const ForEachBodyFunction& body, Node* first = nullptr,
                Node* last = nullptr, CodeStubAssembler::ParameterMode mode =
                                          CodeStubAssembler::INTPTR_PARAMETERS) {
     CodeStubAssembler::VariableList list(0, assembler_->zone());
     ForEach(list, body, first, last);
@@ skipping 86 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_