rustc_attr_parsing/attributes/
instruction_set.rs

1use rustc_feature::AttributeStability;
2use rustc_hir::attrs::InstructionSetAttr;
3
4use super::prelude::*;
5use crate::session_diagnostics;
6
7pub(crate) struct InstructionSetParser;
8
9impl SingleAttributeParser for InstructionSetParser {
10    const PATH: &[Symbol] = &[sym::instruction_set];
11    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[
12        Allow(Target::Fn),
13        Allow(Target::Closure),
14        Allow(Target::Method(MethodKind::Inherent)),
15        Allow(Target::Method(MethodKind::TraitImpl)),
16        Allow(Target::Method(MethodKind::Trait { body: true })),
17    ]);
18    const TEMPLATE: AttributeTemplate = crate::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");
19    const STABILITY: AttributeStability = AttributeStability::Stable;
20
21    fn convert(cx: &mut AcceptContext<'_, '_>, args: &ArgParser) -> Option<AttributeKind> {
22        const POSSIBLE_SYMBOLS: &[Symbol] = &[sym::arm_a32, sym::arm_t32];
23        const POSSIBLE_ARM_SYMBOLS: &[Symbol] = &[sym::a32, sym::t32];
24        let maybe_meta_item = cx.expect_single_element_list(args, cx.attr_span)?;
25
26        let Some(meta_item) = maybe_meta_item.meta_item_no_args() else {
27            cx.adcx().expected_specific_argument(maybe_meta_item.span(), POSSIBLE_SYMBOLS);
28            return None;
29        };
30
31        let mut segments = meta_item.path().segments();
32
33        let Some(architecture) = segments.next() else {
34            cx.adcx().expected_specific_argument(meta_item.span(), POSSIBLE_SYMBOLS);
35            return None;
36        };
37
38        let Some(instruction_set) = segments.next() else {
39            cx.adcx().expected_specific_argument(architecture.span, POSSIBLE_SYMBOLS);
40            return None;
41        };
42
43        let instruction_set = match architecture.name {
44            sym::arm => {
45                if !cx.sess.target.has_thumb_interworking {
46                    cx.dcx().emit_err(session_diagnostics::UnsupportedInstructionSet {
47                        span: cx.attr_span,
48                        instruction_set: sym::arm,
49                        current_target: &cx.sess.opts.target_triple,
50                    });
51                    return None;
52                }
53                match instruction_set.name {
54                    sym::a32 => InstructionSetAttr::ArmA32,
55                    sym::t32 => InstructionSetAttr::ArmT32,
56                    _ => {
57                        cx.adcx()
58                            .expected_specific_argument(instruction_set.span, POSSIBLE_ARM_SYMBOLS);
59                        return None;
60                    }
61                }
62            }
63            _ => {
64                cx.adcx().expected_specific_argument(architecture.span, POSSIBLE_SYMBOLS);
65                return None;
66            }
67        };
68
69        Some(AttributeKind::InstructionSet(instruction_set))
70    }
71}
rustc_attr_parsing/attributes/instruction_set.rs

rustc_attr_parsing/attributes/
instruction_set.rs
