rustc_attr_parsing/attributes/
instruction_set.rs

1use rustc_hir::attrs::InstructionSetAttr;
2
3use super::prelude::*;
4use crate::session_diagnostics;
5
6pub(crate) struct InstructionSetParser;
7
8impl<S: Stage> SingleAttributeParser<S> for InstructionSetParser {
9    const PATH: &[Symbol] = &[sym::instruction_set];
10    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[
11        Allow(Target::Fn),
12        Allow(Target::Closure),
13        Allow(Target::Method(MethodKind::Inherent)),
14        Allow(Target::Method(MethodKind::TraitImpl)),
15        Allow(Target::Method(MethodKind::Trait { body: true })),
16    ]);
17    const TEMPLATE: AttributeTemplate = ::rustc_feature::AttributeTemplate {
    word: false,
    list: Some(&["set"]),
    one_of: &[],
    name_value_str: None,
    docs: Some("https://doc.rust-lang.org/reference/attributes/codegen.html#the-instruction_set-attribute"),
}template!(List: &["set"], "https://doc.rust-lang.org/reference/attributes/codegen.html#the-instruction_set-attribute");
18
19    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser) -> Option<AttributeKind> {
20        const POSSIBLE_SYMBOLS: &[Symbol] = &[sym::arm_a32, sym::arm_t32];
21        const POSSIBLE_ARM_SYMBOLS: &[Symbol] = &[sym::a32, sym::t32];
22        let maybe_meta_item = cx.expect_single_element_list(args, cx.attr_span)?;
23
24        let Some(meta_item) = maybe_meta_item.meta_item() else {
25            cx.adcx().expected_specific_argument(maybe_meta_item.span(), POSSIBLE_SYMBOLS);
26            return None;
27        };
28
29        let mut segments = meta_item.path().segments();
30
31        let Some(architecture) = segments.next() else {
32            cx.adcx().expected_specific_argument(meta_item.span(), POSSIBLE_SYMBOLS);
33            return None;
34        };
35
36        let Some(instruction_set) = segments.next() else {
37            cx.adcx().expected_specific_argument(architecture.span, POSSIBLE_SYMBOLS);
38            return None;
39        };
40
41        let instruction_set = match architecture.name {
42            sym::arm => {
43                if !cx.sess.target.has_thumb_interworking {
44                    cx.dcx().emit_err(session_diagnostics::UnsupportedInstructionSet {
45                        span: cx.attr_span,
46                        instruction_set: sym::arm,
47                        current_target: &cx.sess.opts.target_triple,
48                    });
49                    return None;
50                }
51                match instruction_set.name {
52                    sym::a32 => InstructionSetAttr::ArmA32,
53                    sym::t32 => InstructionSetAttr::ArmT32,
54                    _ => {
55                        cx.adcx()
56                            .expected_specific_argument(instruction_set.span, POSSIBLE_ARM_SYMBOLS);
57                        return None;
58                    }
59                }
60            }
61            _ => {
62                cx.adcx().expected_specific_argument(architecture.span, POSSIBLE_SYMBOLS);
63                return None;
64            }
65        };
66
67        Some(AttributeKind::InstructionSet(instruction_set))
68    }
69}
rustc_attr_parsing/attributes/instruction_set.rs

rustc_attr_parsing/attributes/
instruction_set.rs
