[es6] support rest parameters in arrow functions (alternative)

src/ast.h

 // Copyright 2012 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_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 57 matching lines @@
   V(ForInStatement)                             \
   V(ForOfStatement)                             \
   V(TryCatchStatement)                          \
   V(TryFinallyStatement)                        \
   V(DebuggerStatement)
 
 #define EXPRESSION_NODE_LIST(V) \
   V(FunctionLiteral)            \
   V(ClassLiteral)               \
   V(NativeFunctionLiteral)      \
+  V(Spread)                     \
   V(Conditional)                \
   V(VariableProxy)              \
   V(Literal)                    \
   V(RegExpLiteral)              \
   V(ObjectLiteral)              \
   V(ArrayLiteral)               \
   V(Assignment)                 \
   V(Yield)                      \
   V(Throw)                      \
   V(Property)                   \
@@ skipping 2129 matching lines @@
   int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
   Token::Value op_;
   Expression* left_;
   Expression* right_;
 
   Type* combined_type_;
 };
 
 
+class Spread FINAL : public Expression {
+ public:
+  DECLARE_NODE_TYPE(Spread)
+
+  Expression* expression() const { return expression_; }
+
+  static int num_ids() { return parent_num_ids(); }
+
+ protected:
+  Spread(Zone* zone, Expression* expression, int position)
+      : Expression(zone, position),
+        expression_(expression) {}
+  static int parent_num_ids() { return Expression::num_ids(); }
+
+ private:
+  int local_id(int n) const { return base_id() + parent_num_ids() + n; }
+
+  Expression* expression_;
+};
+
+
 class Conditional FINAL : public Expression {
  public:
   DECLARE_NODE_TYPE(Conditional)
 
   Expression* condition() const { return condition_; }
   Expression* then_expression() const { return then_expression_; }
   Expression* else_expression() const { return else_expression_; }
 
   static int num_ids() { return parent_num_ids() + 2; }
   BailoutId ThenId() const { return BailoutId(local_id(0)); }
@@ skipping 1188 matching lines @@
     return new (zone_) CountOperation(zone_, op, is_prefix, expr, pos);
   }
 
   CompareOperation* NewCompareOperation(Token::Value op,
                                         Expression* left,
                                         Expression* right,
                                         int pos) {
     return new (zone_) CompareOperation(zone_, op, left, right, pos);
   }
 
+  Spread* NewSpread(Expression* expression, int position) {
+    return new (zone_) Spread(zone_, expression, position);
+  }
+
   Conditional* NewConditional(Expression* condition,
                               Expression* then_expression,
                               Expression* else_expression,
                               int position) {
     return new (zone_) Conditional(zone_, condition, then_expression,
                                    else_expression, position);
   }
 
   Assignment* NewAssignment(Token::Value op,
                             Expression* target,
@@ skipping 64 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_