PPC: Partial revert of rest parameter desugaring.

src/full-codegen/ppc/full-codegen-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 246 matching lines @@
     SetVar(this_function_var, r4, r3, r5);
   }
 
   // Possibly set up a local binding to the new target value.
   Variable* new_target_var = scope()->new_target_var();
   if (new_target_var != nullptr) {
     Comment cmnt(masm_, "[ new.target");
     SetVar(new_target_var, r6, r3, r5);
   }
 
+  // Possibly allocate RestParameters
+  int rest_index;
+  Variable* rest_param = scope()->rest_parameter(&rest_index);
+  if (rest_param) {
+    Comment cmnt(masm_, "[ Allocate rest parameter array");
+
+    int num_parameters = info->scope()->num_parameters();
+    int offset = num_parameters * kPointerSize;
+
+    __ addi(r6, fp, Operand(StandardFrameConstants::kCallerSPOffset + offset));
+    __ LoadSmiLiteral(r5, Smi::FromInt(num_parameters));
+    __ LoadSmiLiteral(r4, Smi::FromInt(rest_index));
+    __ LoadSmiLiteral(r3, Smi::FromInt(language_mode()));
+    __ Push(r6, r5, r4, r3);
+    function_in_register_r4 = false;
+
+    RestParamAccessStub stub(isolate());
+    __ CallStub(&stub);
+
+    SetVar(rest_param, r3, r4, r5);
+  }
+
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
     DCHECK(r4.is(ArgumentsAccessNewDescriptor::function()));
     if (!function_in_register_r4) {
       // Load this again, if it's used by the local context below.
       __ LoadP(r4, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
     }
     // Receiver is just before the parameters on the caller's stack.
@@ skipping 4559 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_PPC