[builtins] Port parameter and argument-related code stubs to CSA

src/builtins/builtins-arguments.h

+// Copyright 2017 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.
+
+#include "src/code-stub-assembler.h"
+
+namespace v8 {
+namespace internal {
+
+typedef compiler::Node Node;
+typedef compiler::CodeAssemblerState CodeAssemblerState;
+typedef compiler::CodeAssemblerLabel CodeAssemblerLabel;
+
+class ArgumentsBuiltinsAssembler : public CodeStubAssembler {
+ public:
+  explicit ArgumentsBuiltinsAssembler(CodeAssemblerState* state)
+      : CodeStubAssembler(state) {}
+
+  Node* EmitFastNewStrictArguments(Node* context, Node* function);
+  Node* EmitFastNewSloppyArguments(Node* context, Node* function);
+  Node* EmitFastNewRestParameter(Node* context, Node* function);
+
+ private:
+  // Calculates and returns the the frame pointer, argument count and formal
+  // parameter count to be used to access a function's parameters, taking
+  // argument adapter frames into account. The tuple is of the form:
+  // <frame_ptr, # parameters actually passed, formal parameter count>
+  std::tuple<Node*, Node*, Node*> GetArgumentsFrameAndCount(Node* function,
+                                                            ParameterMode mode);
+
+  // Allocates an an arguments (either rest, strict or sloppy) together with the
+  // FixedArray elements for the arguments and a parameter map (for sloppy
+  // arguments only). A tuple is returned with pointers to the arguments object,
+  // the elements and parameter map in the form:
+  // <argument object, arguments FixedArray, parameter map or nullptr>
+  std::tuple<Node*, Node*, Node*> AllocateArgumentsObject(
+      Node* map, Node* arguments, Node* mapped_arguments,
+      ParameterMode param_mode, int base_size);
+
+  // For Rest parameters and Strict arguments, the copying of parameters from
+  // the stack into the arguments object is straight-forward and shares much of
+  // the same underlying logic, which is encapsulated by this function. It
+  // allocates an arguments-like object of size |base_size| with the map |map|,
+  // and then copies |rest_count| arguments from the stack frame pointed to by
+  // |frame_ptr| starting from |first_arg|. |arg_count| == |first_arg| +
+  // |rest_count|.
+  Node* ConstructParametersObjectFromArgs(Node* map, Node* frame_ptr,
+                                          Node* arg_count, Node* first_arg,
+                                          Node* rest_count,
+                                          ParameterMode param_mode,
+                                          int base_size);
+};
+
+}  // namespace internal
+}  // namespace v8