// edi : the function to call
FrameScope scope(masm, StackFrame::INTERNAL);
- // Arguments register must be smi-tagged to call out.
+ // Number-of-arguments register must be smi-tagged to call out.
__ SmiTag(eax);
__ push(eax);
__ push(edi);
// A monomorphic cache hit or an already megamorphic state: invoke the
// function without changing the state.
+ // We don't know if ecx is a WeakCell or a Symbol, but it's harmless to read
+ // at this position in a symbol (see static asserts in
+ // type-feedback-vector.h).
Label check_allocation_site;
__ cmp(edi, FieldOperand(ecx, WeakCell::kValueOffset));
__ j(equal, &done, Label::kFar);
__ CompareRoot(ecx, Heap::kmegamorphic_symbolRootIndex);
__ j(equal, &done, Label::kFar);
- __ CompareRoot(FieldOperand(ecx, 0), Heap::kWeakCellMapRootIndex);
+ __ CompareRoot(FieldOperand(ecx, HeapObject::kMapOffset),
+ Heap::kWeakCellMapRootIndex);
__ j(not_equal, FLAG_pretenuring_call_new ? &miss : &check_allocation_site);
- // If edi is not equal to the weak cell value, and the weak cell value is
- // cleared, we have a new chance to become monomorphic.
+ // If the weak cell is cleared, we have a new chance to become monomorphic.
__ JumpIfSmi(FieldOperand(ecx, WeakCell::kValueOffset), &initialize);
__ jmp(&megamorphic);
// If we came here, we need to see if we are the array function.
// If we didn't have a matching function, and we didn't find the megamorph
// sentinel, then we have in the slot either some other function or an
- // AllocationSite. Do a map check on the object in ecx.
+ // AllocationSite.
__ CompareRoot(FieldOperand(ecx, 0), Heap::kAllocationSiteMapRootIndex);
__ j(not_equal, &miss);