Method: FFI::Pointer#initialize

Defined in:
ext/ffi_c/Pointer.c

#initialize(address) ⇒ self #initialize(type, address) ⇒ self

A new instance of Pointer.

Overloads:

  • #initialize(type, address) ⇒ self

    Create a new pointer from a Type and a base address

    Parameters:

    • type (Type) —

      Optional type for pointer (defaults to byte)

    • address (Pointer, Integer) —

      base address for pointer



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# File 'ext/ffi_c/Pointer.c', line 106

static VALUE
ptr_initialize(int argc, VALUE* argv, VALUE self)
{
    Pointer* p;
    VALUE rbType = Qnil, rbAddress = Qnil;
    int typeSize = 1;

    TypedData_Get_Struct(self, Pointer, &rbffi_pointer_data_type, p);

    switch (rb_scan_args(argc, argv, "11", &rbType, &rbAddress)) {
        case 1:
            rbAddress = rbType;
            typeSize = 1;
            break;
        case 2:
            typeSize = rbffi_type_size(rbType);
            break;
        default:
            rb_raise(rb_eArgError, "Invalid arguments");
    }

    switch (TYPE(rbAddress)) {
        case T_FIXNUM:
        case T_BIGNUM:
            p->memory.address = (void*) (uintptr_t) NUM2ULL(rbAddress);
            p->memory.size = LONG_MAX;
            if (p->memory.address == NULL) {
                p->memory.flags = 0;
            }
            break;

        default:
            if (rb_obj_is_kind_of(rbAddress, rbffi_PointerClass)) {
                Pointer* orig;

                RB_OBJ_WRITE(self, &p->rbParent, rbAddress);
                TypedData_Get_Struct(rbAddress, Pointer, &rbffi_pointer_data_type, orig);
                p->memory = orig->memory;
            } else {
                rb_raise(rb_eTypeError, "wrong argument type, expected Integer or FFI::Pointer");
            }
            break;
    }

    p->memory.typeSize = typeSize;

    return self;
}