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| 1 | +//! Attributes that are only used on function prototypes. |
| 2 | +
|
| 3 | +use rustc_feature::{AttributeTemplate, template}; |
| 4 | +use rustc_hir::Target; |
| 5 | +use rustc_hir::attrs::{AttributeKind, MirDialect, MirPhase}; |
| 6 | +use rustc_span::{Span, Symbol, sym}; |
| 7 | + |
| 8 | +use super::{AttributeOrder, OnDuplicate}; |
| 9 | +use crate::attributes::SingleAttributeParser; |
| 10 | +use crate::context::{AcceptContext, AllowedTargets, MaybeWarn, Stage}; |
| 11 | +use crate::parser::ArgParser; |
| 12 | + |
| 13 | +pub(crate) struct CustomMirParser; |
| 14 | + |
| 15 | +impl<S: Stage> SingleAttributeParser<S> for CustomMirParser { |
| 16 | + const PATH: &[rustc_span::Symbol] = &[sym::custom_mir]; |
| 17 | + |
| 18 | + const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepOutermost; |
| 19 | + |
| 20 | + const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error; |
| 21 | + |
| 22 | + const ALLOWED_TARGETS: AllowedTargets = |
| 23 | + AllowedTargets::AllowList(&[MaybeWarn::Allow(Target::Fn)]); |
| 24 | + |
| 25 | + const TEMPLATE: AttributeTemplate = template!(List: &[r#"dialect = "...", phase = "...""#]); |
| 26 | + |
| 27 | + fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> { |
| 28 | + let Some(list) = args.list() else { |
| 29 | + cx.expected_list(cx.attr_span); |
| 30 | + return None; |
| 31 | + }; |
| 32 | + |
| 33 | + let mut dialect = None; |
| 34 | + let mut phase = None; |
| 35 | + let mut failed = false; |
| 36 | + |
| 37 | + for item in list.mixed() { |
| 38 | + let Some(meta_item) = item.meta_item() else { |
| 39 | + cx.expected_name_value(item.span(), None); |
| 40 | + failed = true; |
| 41 | + break; |
| 42 | + }; |
| 43 | + |
| 44 | + if let Some(arg) = meta_item.word_is(sym::dialect) { |
| 45 | + extract_value(cx, sym::dialect, arg, meta_item.span(), &mut dialect, &mut failed); |
| 46 | + } else if let Some(arg) = meta_item.word_is(sym::phase) { |
| 47 | + extract_value(cx, sym::phase, arg, meta_item.span(), &mut phase, &mut failed); |
| 48 | + } else if let Some(word) = meta_item.path().word() { |
| 49 | + let word = word.to_string(); |
| 50 | + cx.unknown_key(meta_item.span(), word, &["dialect", "phase"]); |
| 51 | + failed = true; |
| 52 | + } else { |
| 53 | + cx.expected_name_value(meta_item.span(), None); |
| 54 | + failed = true; |
| 55 | + }; |
| 56 | + } |
| 57 | + |
| 58 | + let dialect = parse_dialect(cx, dialect, &mut failed); |
| 59 | + let phase = parse_phase(cx, phase, &mut failed); |
| 60 | + |
| 61 | + if failed { |
| 62 | + return None; |
| 63 | + } |
| 64 | + |
| 65 | + Some(AttributeKind::CustomMir(dialect, phase, cx.attr_span)) |
| 66 | + } |
| 67 | +} |
| 68 | + |
| 69 | +fn extract_value<S: Stage>( |
| 70 | + cx: &mut AcceptContext<'_, '_, S>, |
| 71 | + key: Symbol, |
| 72 | + arg: &ArgParser<'_>, |
| 73 | + span: Span, |
| 74 | + out_val: &mut Option<(Symbol, Span)>, |
| 75 | + failed: &mut bool, |
| 76 | +) { |
| 77 | + if out_val.is_some() { |
| 78 | + cx.duplicate_key(span, key); |
| 79 | + *failed = true; |
| 80 | + return; |
| 81 | + } |
| 82 | + |
| 83 | + let Some(val) = arg.name_value() else { |
| 84 | + cx.expected_single_argument(arg.span().unwrap_or(span)); |
| 85 | + *failed = true; |
| 86 | + return; |
| 87 | + }; |
| 88 | + |
| 89 | + let Some(value_sym) = val.value_as_str() else { |
| 90 | + cx.expected_string_literal(val.value_span, Some(val.value_as_lit())); |
| 91 | + *failed = true; |
| 92 | + return; |
| 93 | + }; |
| 94 | + |
| 95 | + *out_val = Some((value_sym, val.value_span)); |
| 96 | +} |
| 97 | + |
| 98 | +fn parse_dialect<S: Stage>( |
| 99 | + cx: &mut AcceptContext<'_, '_, S>, |
| 100 | + dialect: Option<(Symbol, Span)>, |
| 101 | + failed: &mut bool, |
| 102 | +) -> Option<(MirDialect, Span)> { |
| 103 | + let (dialect, span) = dialect?; |
| 104 | + |
| 105 | + let dialect = match dialect { |
| 106 | + sym::analysis => MirDialect::Analysis, |
| 107 | + sym::built => MirDialect::Built, |
| 108 | + sym::runtime => MirDialect::Runtime, |
| 109 | + |
| 110 | + _ => { |
| 111 | + cx.expected_specific_argument(span, vec!["analysis", "built", "runtime"]); |
| 112 | + *failed = true; |
| 113 | + return None; |
| 114 | + } |
| 115 | + }; |
| 116 | + |
| 117 | + Some((dialect, span)) |
| 118 | +} |
| 119 | + |
| 120 | +fn parse_phase<S: Stage>( |
| 121 | + cx: &mut AcceptContext<'_, '_, S>, |
| 122 | + phase: Option<(Symbol, Span)>, |
| 123 | + failed: &mut bool, |
| 124 | +) -> Option<(MirPhase, Span)> { |
| 125 | + let (phase, span) = phase?; |
| 126 | + |
| 127 | + let phase = match phase { |
| 128 | + sym::initial => MirPhase::Initial, |
| 129 | + sym::post_cleanup => MirPhase::PostCleanup, |
| 130 | + sym::optimized => MirPhase::Optimized, |
| 131 | + |
| 132 | + _ => { |
| 133 | + cx.expected_specific_argument(span, vec!["initial", "post-cleanup", "optimized"]); |
| 134 | + *failed = true; |
| 135 | + return None; |
| 136 | + } |
| 137 | + }; |
| 138 | + |
| 139 | + Some((phase, span)) |
| 140 | +} |
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