asm-play/bltn_closure.asm

%ifndef BLTN_CLOSURE_ASM
%define BLTN_CLOSURE_ASM

%include "syscalls.asm"
%include "print_type.asm"
%include "heap.asm"
%include "type_check.asm"

section .text

bltn_alloc_closure:
	;; INPUT: rax closure length, r8 the label
	;; OUTPUT: rax the heap address of the uninitialized closure
	
	;; uses rcx as a temporary
	
	mov	rcx, rax
	add	rax, 1
	call	heap_alloc
	
	mov	[rax], r8
	mov	[rax + 8], rcx
	
	or	rax, 0b011	; tag it as a closure
	
	ret

%endif