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use rustc_ast::LitKind;
use rustc_attr_data_structures::AttributeKind;
use rustc_feature::{AttributeTemplate, template};
use rustc_span::{Symbol, sym};
use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
use crate::context::{AcceptContext, Stage};
use crate::parser::ArgParser;
pub(crate) struct RustcLayoutScalarValidRangeStart;
impl<S: Stage> SingleAttributeParser<S> for RustcLayoutScalarValidRangeStart {
const PATH: &'static [Symbol] = &[sym::rustc_layout_scalar_valid_range_start];
const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
const TEMPLATE: AttributeTemplate = template!(List: "start");
fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
parse_rustc_layout_scalar_valid_range(cx, args)
.map(|n| AttributeKind::RustcLayoutScalarValidRangeStart(n, cx.attr_span))
}
}
pub(crate) struct RustcLayoutScalarValidRangeEnd;
impl<S: Stage> SingleAttributeParser<S> for RustcLayoutScalarValidRangeEnd {
const PATH: &'static [Symbol] = &[sym::rustc_layout_scalar_valid_range_end];
const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
const TEMPLATE: AttributeTemplate = template!(List: "end");
fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
parse_rustc_layout_scalar_valid_range(cx, args)
.map(|n| AttributeKind::RustcLayoutScalarValidRangeEnd(n, cx.attr_span))
}
}
fn parse_rustc_layout_scalar_valid_range<S: Stage>(
cx: &mut AcceptContext<'_, '_, S>,
args: &ArgParser<'_>,
) -> Option<Box<u128>> {
let Some(list) = args.list() else {
cx.expected_list(cx.attr_span);
return None;
};
let Some(single) = list.single() else {
cx.expected_single_argument(list.span);
return None;
};
let Some(lit) = single.lit() else {
cx.expected_integer_literal(single.span());
return None;
};
let LitKind::Int(num, _ty) = lit.kind else {
cx.expected_integer_literal(single.span());
return None;
};
Some(Box::new(num.0))
}
pub(crate) struct RustcObjectLifetimeDefaultParser;
impl<S: Stage> SingleAttributeParser<S> for RustcObjectLifetimeDefaultParser {
const PATH: &[rustc_span::Symbol] = &[sym::rustc_object_lifetime_default];
const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
const TEMPLATE: AttributeTemplate = template!(Word);
fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
if let Err(span) = args.no_args() {
cx.expected_no_args(span);
return None;
}
Some(AttributeKind::RustcObjectLifetimeDefault)
}
}
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