[fpc-devel] OSX: Setting up parameters to objc_msgSend()

David Jenkins david at scootersoftware.com
Fri Oct 12 16:38:06 CEST 2018

On 10/12/18 8:17 AM, Dmitry Boyarintsev wrote:
> So, I'm wondering if it's actually a compiler issue or headers issue.
> and can ByteBool be used as a substitute for signed char.
> thanks,
> Dmitry
> _______________________________________________
> fpc-devel maillist  -  fpc-devel at lists.freepascal.org
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Changing the header for NSMenuItem.setEnable(BOOL) to 
NSMenuItem(ByteBool) results in the following code in 

     0x1001ba67e <+70>:  movq   %rax, %rbx
     0x1001ba681 <+73>:  movq   0x329ef8(%rip), %rsi      ; "setEnabled:"
     0x1001ba688 <+80>:  movb   -0x10(%rbp), %al
     0x1001ba68b <+83>:  orb    %al, %al
     0x1001ba68d <+85>:  setne  %dl
     0x1001ba690 <+88>:  negb   %dl
     0x1001ba692 <+90>:  movsbl %dl, %edx
     0x1001ba695 <+93>:  movq   %rbx, %rdi
     0x1001ba698 <+96>:  callq  0x1002d23da               ; symbol stub 
for: objc

The movsbl %dl, %edx is good.  Unfortunately the value of %edx is 
0xffffffff not 0x00000001.  This is the same result I saw when I changed 
it to LongBool.


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