Use a separate marker value to allocate the arguments object on deoptimzation...

src/arm/codegen-arm.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 578 matching lines @@
 
 void CodeGenerator::StoreArgumentsObject(bool initial) {
   ArgumentsAllocationMode mode = ArgumentsMode();
   ASSERT(mode != NO_ARGUMENTS_ALLOCATION);
 
   Comment cmnt(masm_, "[ store arguments object");
   if (mode == LAZY_ARGUMENTS_ALLOCATION && initial) {
     // When using lazy arguments allocation, we store the hole value
     // as a sentinel indicating that the arguments object hasn't been
     // allocated yet.
-    frame_->EmitPushRoot(Heap::kTheHoleValueRootIndex);
+    frame_->EmitPushRoot(Heap::kArgumentsMarkerRootIndex);
   } else {
     frame_->SpillAll();
     ArgumentsAccessStub stub(ArgumentsAccessStub::NEW_OBJECT);
     __ ldr(r2, frame_->Function());
     // The receiver is below the arguments, the return address, and the
     // frame pointer on the stack.
     const int kReceiverDisplacement = 2 + scope()->num_parameters();
     __ add(r1, fp, Operand(kReceiverDisplacement * kPointerSize));
     __ mov(r0, Operand(Smi::FromInt(scope()->num_parameters())));
     frame_->Adjust(3);
     __ Push(r2, r1, r0);
     frame_->CallStub(&stub, 3);
     frame_->EmitPush(r0);
   }
 
   Variable* arguments = scope()->arguments();
   Variable* shadow = scope()->arguments_shadow();
   ASSERT(arguments != NULL && arguments->AsSlot() != NULL);
   ASSERT(shadow != NULL && shadow->AsSlot() != NULL);
   JumpTarget done;
   if (mode == LAZY_ARGUMENTS_ALLOCATION && !initial) {
     // We have to skip storing into the arguments slot if it has
     // already been written to. This can happen if the a function
     // has a local variable named 'arguments'.
     LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF);
     Register arguments = frame_->PopToRegister();
-    __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+    __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
     __ cmp(arguments, ip);
     done.Branch(ne);
   }
   StoreToSlot(arguments->AsSlot(), NOT_CONST_INIT);
   if (mode == LAZY_ARGUMENTS_ALLOCATION) done.Bind();
   StoreToSlot(shadow->AsSlot(), NOT_CONST_INIT);
 }
 
 
 void CodeGenerator::LoadTypeofExpression(Expression* expr) {
@@ skipping 1104 matching lines @@
   //   sp[1]: receiver
   //   sp[2]: applicand.apply
   //   sp[3]: applicand.
 
   // Check if the arguments object has been lazily allocated
   // already. If so, just use that instead of copying the arguments
   // from the stack. This also deals with cases where a local variable
   // named 'arguments' has been introduced.
   JumpTarget slow;
   Label done;
-  __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+  __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
   __ cmp(ip, arguments_reg);
   slow.Branch(ne);
 
   Label build_args;
   // Get rid of the arguments object probe.
   frame_->Drop();
   // Stack now has 3 elements on it.
   // Contents of stack at this point:
   //   sp[0]: receiver - in the receiver_reg register.
   //   sp[1]: applicand.apply
@@ skipping 1486 matching lines @@
   // ... or if the slot isn't a non-parameter arguments slot.
   if (slot->type() == Slot::PARAMETER || !slot->is_arguments()) return;
 
   // Load the loaded value from the stack into a register but leave it on the
   // stack.
   Register tos = frame_->Peek();
 
   // If the loaded value is the sentinel that indicates that we
   // haven't loaded the arguments object yet, we need to do it now.
   JumpTarget exit;
-  __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+  __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
   __ cmp(tos, ip);
   exit.Branch(ne);
   frame_->Drop();
   StoreArgumentsObject(false);
   exit.Bind();
 }
 
 
 void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
   ASSERT(slot != NULL);
@@ skipping 4099 matching lines @@
                BinaryOpIC::GetName(runtime_operands_type_));
   return name_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM