@[has_globals]
module builtin

// Shitty `sbrk` basic `malloc` and `free` impl
// TODO: implement pure V `walloc` later

__global g_heap_base = usize(vwasm_heap_base())

// malloc dynamically allocates a `n` bytes block of memory on the heap.
// malloc returns a `byteptr` pointing to the memory address of the allocated space.
// unlike the `calloc` family of functions - malloc will not zero the memory block.
@[unsafe]
pub fn malloc(n isize) &u8 {
    if n <= 0 {
        $if no_imports ? {
            return unsafe { nil }
        } $else {
            panic('malloc(n <= 0)')
        }
    }

    res := g_heap_base
    g_heap_base += usize(n)

    return &u8(res)
}

// free allows for manually freeing memory allocated at the address `ptr`.
// currently does not free any memory.
@[unsafe]
pub fn free(ptr voidptr) {
    _ := ptr
}