[Interpreter] Adds support for rest parameters to interpreter.

src/interpreter/interpreter.cc

 // Copyright 2015 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/interpreter/interpreter.h"
 
 #include "src/ast/prettyprinter.h"
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/compiler/interpreter-assembler.h"
@@ skipping 1752 matching lines @@
 //
 // Creates a new unmapped arguments object.
 void Interpreter::DoCreateUnmappedArguments(
     compiler::InterpreterAssembler* assembler) {
   Node* closure = __ LoadRegister(Register::function_closure());
   Node* result = __ CallRuntime(Runtime::kNewStrictArguments_Generic, closure);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
+// CreateRestArguments
+//
+// Creates a new rest arguments object starting at |rest_index|.
+void Interpreter::DoCreateRestArguments(
+    compiler::InterpreterAssembler* assembler) {
+  Node* closure = __ LoadRegister(Register::function_closure());
+  Node* constant_pool_index = __ BytecodeOperandIdx(0);
+  Node* rest_index = __ LoadConstantPoolEntry(constant_pool_index);
+  Node* result =
+      __ CallRuntime(Runtime::kNewRestArguments_Generic, closure, rest_index);
+  __ SetAccumulator(result);
+  __ Dispatch();
+}
 
 // Throw
 //
 // Throws the exception in the accumulator.
 void Interpreter::DoThrow(compiler::InterpreterAssembler* assembler) {
   Node* exception = __ GetAccumulator();
   __ CallRuntime(Runtime::kThrow, exception);
   // We shouldn't ever return from a throw.
   __ Abort(kUnexpectedReturnFromThrow);
 }
@@ skipping 103 matching lines @@
   Node* index_reg = __ BytecodeOperandReg(0);
   Node* index = __ LoadRegister(index_reg);
   Node* result = __ CallRuntime(Runtime::kForInStep, index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8