Only create arguments-maps in the bootstrapper, remove now obsolete ValueType flag.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 904 matching lines @@
   __ leap(r8, Operand(r8, rcx, times_pointer_size, FixedArray::kHeaderSize));
 
   // 3. Arguments object.
   __ addp(r8, Immediate(Heap::kSloppyArgumentsObjectSize));
 
   // Do the allocation of all three objects in one go.
   __ Allocate(r8, rax, rdx, rdi, &runtime, TAG_OBJECT);
 
   // rax = address of new object(s) (tagged)
   // rcx = argument count (untagged)
-  // Get the arguments boilerplate from the current native context into rdi.
-  Label has_mapped_parameters, copy;
+  // Get the arguments map from the current native context into rdi.
+  Label has_mapped_parameters, instantiate;
   __ movp(rdi, Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
   __ movp(rdi, FieldOperand(rdi, GlobalObject::kNativeContextOffset));
   __ testp(rbx, rbx);
   __ j(not_zero, &has_mapped_parameters, Label::kNear);
 
-  const int kIndex = Context::SLOPPY_ARGUMENTS_BOILERPLATE_INDEX;
+  const int kIndex = Context::SLOPPY_ARGUMENTS_MAP_INDEX;
   __ movp(rdi, Operand(rdi, Context::SlotOffset(kIndex)));
-  __ jmp(&copy, Label::kNear);
+  __ jmp(&instantiate, Label::kNear);
 
-  const int kAliasedIndex = Context::ALIASED_ARGUMENTS_BOILERPLATE_INDEX;
+  const int kAliasedIndex = Context::ALIASED_ARGUMENTS_MAP_INDEX;
   __ bind(&has_mapped_parameters);
   __ movp(rdi, Operand(rdi, Context::SlotOffset(kAliasedIndex)));
-  __ bind(&copy);
+  __ bind(&instantiate);
 
   // rax = address of new object (tagged)
   // rbx = mapped parameter count (untagged)
   // rcx = argument count (untagged)
-  // rdi = address of boilerplate object (tagged)
-  // Copy the JS object part.
-  for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
-    __ movp(rdx, FieldOperand(rdi, i));
-    __ movp(FieldOperand(rax, i), rdx);
-  }
+  // rdi = address of arguments map (tagged)
+  __ movp(FieldOperand(rax, JSObject::kMapOffset), rdi);
+  __ LoadRoot(kScratchRegister, Heap::kEmptyFixedArrayRootIndex);
+  __ movp(FieldOperand(rax, JSObject::kPropertiesOffset), kScratchRegister);
+  __ movp(FieldOperand(rax, JSObject::kElementsOffset), kScratchRegister);
 
   // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
   __ movp(rdx, args.GetArgumentOperand(0));
+  __ AssertNotSmi(rdx);
   __ movp(FieldOperand(rax, JSObject::kHeaderSize +
                        Heap::kArgumentsCalleeIndex * kPointerSize),
           rdx);
 
   // Use the length (smi tagged) and set that as an in-object property too.
   // Note: rcx is tagged from here on.
   STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
   __ Integer32ToSmi(rcx, rcx);
   __ movp(FieldOperand(rax, JSObject::kHeaderSize +
                        Heap::kArgumentsLengthIndex * kPointerSize),
@@ skipping 169 matching lines @@
   __ bind(&try_allocate);
   __ testp(rcx, rcx);
   __ j(zero, &add_arguments_object, Label::kNear);
   __ leap(rcx, Operand(rcx, times_pointer_size, FixedArray::kHeaderSize));
   __ bind(&add_arguments_object);
   __ addp(rcx, Immediate(Heap::kStrictArgumentsObjectSize));
 
   // Do the allocation of both objects in one go.
   __ Allocate(rcx, rax, rdx, rbx, &runtime, TAG_OBJECT);
 
-  // Get the arguments boilerplate from the current native context.
+  // Get the arguments map from the current native context.
   __ movp(rdi, Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
   __ movp(rdi, FieldOperand(rdi, GlobalObject::kNativeContextOffset));
-  const int offset =
-      Context::SlotOffset(Context::STRICT_ARGUMENTS_BOILERPLATE_INDEX);
+  const int offset = Context::SlotOffset(Context::STRICT_ARGUMENTS_MAP_INDEX);
   __ movp(rdi, Operand(rdi, offset));
 
-  // Copy the JS object part.
-  for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
-    __ movp(rbx, FieldOperand(rdi, i));
-    __ movp(FieldOperand(rax, i), rbx);
-  }
+  __ movp(FieldOperand(rax, JSObject::kMapOffset), rdi);
+  __ LoadRoot(kScratchRegister, Heap::kEmptyFixedArrayRootIndex);
+  __ movp(FieldOperand(rax, JSObject::kPropertiesOffset), kScratchRegister);
+  __ movp(FieldOperand(rax, JSObject::kElementsOffset), kScratchRegister);
 
   // Get the length (smi tagged) and set that as an in-object property too.
   STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
   __ movp(rcx, args.GetArgumentOperand(2));
   __ movp(FieldOperand(rax, JSObject::kHeaderSize +
                        Heap::kArgumentsLengthIndex * kPointerSize),
           rcx);
 
   // If there are no actual arguments, we're done.
   Label done;
@@ skipping 3776 matching lines @@
                               return_value_operand,
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64