# Copyright (C) 2022-2023 Exaloop Inc. <https://exaloop.io>
# Primarily for internal use. Regular users should not use this module.

@pure
@C
def seq_alloc(a: int) -> cobj:
    pass

@pure
@C
def seq_alloc_atomic(a: int) -> cobj:
    pass

@nocapture
@derives
@C
def seq_realloc(p: cobj, newsize: int, oldsize: int) -> cobj:
    pass

@nocapture
@C
def seq_free(p: cobj) -> None:
    pass

@nocapture
@C
def seq_register_finalizer(p: cobj, f: cobj) -> None:
    pass

@nocapture
@C
def seq_gc_add_roots(p: cobj, q: cobj) -> None:
    pass

@nocapture
@C
def seq_gc_remove_roots(p: cobj, q: cobj) -> None:
    pass

@C
def seq_gc_clear_roots() -> None:
    pass

@nocapture
@C
def seq_gc_exclude_static_roots(p: cobj, q: cobj) -> None:
    pass

def sizeof(T: type):
    return T.__elemsize__

def atomic(T: type):
    return T.__atomic__

def alloc(sz: int):
    return seq_alloc(sz)

# Allocates a block of memory via GC, where the
# caller guarantees that this block will not store
# pointers to other GC-allocated data.
def alloc_atomic(sz: int):
    return seq_alloc_atomic(sz)

def realloc(p: cobj, newsz: int, oldsz: int):
    return seq_realloc(p, newsz, oldsz)

def free(p: cobj):
    seq_free(p)

def add_roots(start: cobj, end: cobj):
    seq_gc_add_roots(start, end)

def remove_roots(start: cobj, end: cobj):
    seq_gc_remove_roots(start, end)

def clear_roots():
    seq_gc_clear_roots()

def exclude_static_roots(start: cobj, end: cobj):
    seq_gc_exclude_static_roots(start, end)

def register_finalizer(p):
    if hasattr(p, "__del__"):

        def f(x: cobj, data: cobj, T: type):
            Ptr[T](__ptr__(x).as_byte())[0].__del__()

        seq_register_finalizer(p.__raw__(), f(T=type(p), ...).__raw__())

def construct_ref[T](args) -> T:
    p = T.__new__()
    p.__init__(*args)
    return p
