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Do RestyleHint assertions at runtime so they use build-time bindgen.

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Cameron McCormack 2017-02-14 10:38:59 +08:00
parent d44bf6182f
commit 229eb93fa3
3 changed files with 38 additions and 35 deletions
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36
components/style/restyle_hints.rs
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@ -32,8 +32,7 @@ bitflags! {
///
/// Note that the bit values here must be kept in sync with the Gecko
/// nsRestyleHint values. If you add more bits with matching values,
/// please add assertions to assert_restyle_hints_match in
/// tests/unit/stylo/sanity_checks.rs.
/// please add assertions to assert_restyle_hints_match below.
pub flags RestyleHint: u32 {
/// Rerun selector matching on the element.
const RESTYLE_SELF = 0x01,
@ -55,6 +54,39 @@ bitflags! {
}
}
/// Asserts that all RestyleHint flags have a matching nsRestyleHint value.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_restyle_hints_match() {
use gecko_bindings::structs;
macro_rules! check_restyle_hints {
( $( $a:ident => $b:ident ),*, ) => {
if cfg!(debug_assertions) {
let mut hints = RestyleHint::all();
$(
assert_eq!(structs::$a.0 as usize, $b.bits() as usize, stringify!($b));
hints.remove($b);
)*
assert_eq!(hints, RestyleHint::empty(), "all RestyleHint bits should have an assertion");
}
}
}
check_restyle_hints! {
nsRestyleHint_eRestyle_Self => RESTYLE_SELF,
// XXX This for Servo actually means something like an hypothetical
// Restyle_AllDescendants (but without running selector matching on the
// element). ServoRestyleManager interprets it like that, but in practice we
// should align the behavior with Gecko adding a new restyle hint, maybe?
//
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1291786
nsRestyleHint_eRestyle_SomeDescendants => RESTYLE_DESCENDANTS,
nsRestyleHint_eRestyle_LaterSiblings => RESTYLE_LATER_SIBLINGS,
nsRestyleHint_eRestyle_StyleAttribute => RESTYLE_STYLE_ATTRIBUTE,
}
}
impl RestyleHint {
/// The subset hints that affect the styling of a single element during the
/// traversal.