[es6] Re-implement rest parameters via desugaring.

src/mips/code-stubs-mips.cc

 // 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1940 matching lines @@
   // Return and remove the on-stack parameters.
   __ bind(&done);
   __ DropAndRet(3);
 
   // Do the runtime call to allocate the arguments object.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kNewStrictArguments, 3, 1);
 }
 
 
-void RestParamAccessStub::GenerateNew(MacroAssembler* masm) {
-  // sp[0] : language mode
-  // sp[4] : index of rest parameter
-  // sp[8] : number of parameters
-  // sp[12] : receiver displacement
-  // Check if the calling frame is an arguments adaptor frame.
-
-  Label runtime;
-  __ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ lw(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
-  __ Branch(&runtime, ne, a3,
-            Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-
-  // Patch the arguments.length and the parameters pointer.
-  __ lw(a1, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ sw(a1, MemOperand(sp, 2 * kPointerSize));
-  __ sll(at, a1, kPointerSizeLog2 - kSmiTagSize);
-  __ Addu(a3, a2, Operand(at));
-
-  __ Addu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ sw(a3, MemOperand(sp, 3 * kPointerSize));
-
-  // Do the runtime call to allocate the arguments object.
-  __ bind(&runtime);
-  __ TailCallRuntime(Runtime::kNewRestParam, 4, 1);
-}
-
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Just jump directly to runtime if native RegExp is not selected at compile
   // time or if regexp entry in generated code is turned off runtime switch or
   // at compilation.
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
 #else  // V8_INTERPRETED_REGEXP
 
   // Stack frame on entry.
   //  sp[0]: last_match_info (expected JSArray)
@@ skipping 3661 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS