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

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index c08e38b50992bbc1a2fbae027654f08cda603c2c..47e55dffdc88a07b097be661dc9ab4fd4f6b2794 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -923,34 +923,34 @@ void ArgumentsAccessStub::GenerateNewSloppyFast(MacroAssembler* masm) {
   // rax = address of new object(s) (tagged)
   // rcx = argument count (untagged)
   // Get the arguments boilerplate from the current native context into rdi.

[Igor Sheludko, 2014/07/02 14:17:15]

Outdated comment.

-  Label has_mapped_parameters, copy;
+  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)

[Igor Sheludko, 2014/07/02 14:17:14]

Same here.

-  // Copy the JS object part.
-  for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
-    __ movp(rdx, FieldOperand(rdi, i));
-    __ movp(FieldOperand(rax, i), rdx);
-  }
+  __ 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);
@@ -1144,14 +1144,13 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   __ 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);
+      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);