Partial revert of rest parameter 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 1959 matching lines @@
   __ bind(&done);
   __ Ret();
 
   // Do the runtime call to allocate the arguments object.
   __ bind(&runtime);
   __ Push(a1, a3, a2);
   __ 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 3588 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS