const PAGESIZE = 65536;

function print_origin(origin) {
    print(";;");
    print(";; Generated by ../meta/" + origin);
    print(";; DO NOT EDIT THIS FILE.  CHANGE THE SOURCE AND REGENERATE.");
    print(";;");
}

function checkRangeCode(memtype) {
    return `
  (func (export "checkRange") (param $from ${memtype}) (param $to ${memtype}) (param $expected i32) (result ${memtype})
    (loop $cont
      (if (${memtype}.eq (local.get $from) (local.get $to))
        (then
          (return (${memtype}.const -1))))
      (if (i32.eq (i32.load8_u (local.get $from)) (local.get $expected))
        (then
          (local.set $from (${memtype}.add (local.get $from) (${memtype}.const 1)))
          (br $cont))))
    (return (local.get $from)))
`;
}

function checkRange(memtype, from, to, expected) {
    print(
`(assert_return (invoke "checkRange" (${memtype}.const ${from}) (${memtype}.const ${to}) (i32.const ${expected}))
               (${memtype}.const -1))`);
}