1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
//! Collects lang items: items marked with `#[lang = "..."]` attribute.
//!
//! This attribute to tell the compiler about semi built-in std library
//! features, such as Fn family of traits.
use std::sync::Arc;
use rustc_hash::FxHashMap;
use syntax::SmolStr;
use crate::{
db::DefDatabase, AdtId, AttrDefId, CrateId, EnumId, EnumVariantId, FunctionId, ImplId,
ModuleDefId, StaticId, StructId, TraitId,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum LangItemTarget {
EnumId(EnumId),
FunctionId(FunctionId),
ImplDefId(ImplId),
StaticId(StaticId),
StructId(StructId),
TraitId(TraitId),
EnumVariantId(EnumVariantId),
}
impl LangItemTarget {
pub fn as_enum(self) -> Option<EnumId> {
match self {
LangItemTarget::EnumId(id) => Some(id),
_ => None,
}
}
pub fn as_function(self) -> Option<FunctionId> {
match self {
LangItemTarget::FunctionId(id) => Some(id),
_ => None,
}
}
pub fn as_impl_def(self) -> Option<ImplId> {
match self {
LangItemTarget::ImplDefId(id) => Some(id),
_ => None,
}
}
pub fn as_static(self) -> Option<StaticId> {
match self {
LangItemTarget::StaticId(id) => Some(id),
_ => None,
}
}
pub fn as_struct(self) -> Option<StructId> {
match self {
LangItemTarget::StructId(id) => Some(id),
_ => None,
}
}
pub fn as_trait(self) -> Option<TraitId> {
match self {
LangItemTarget::TraitId(id) => Some(id),
_ => None,
}
}
pub fn as_enum_variant(self) -> Option<EnumVariantId> {
match self {
LangItemTarget::EnumVariantId(id) => Some(id),
_ => None,
}
}
}
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct LangItems {
items: FxHashMap<SmolStr, LangItemTarget>,
}
impl LangItems {
pub fn target(&self, item: &str) -> Option<LangItemTarget> {
self.items.get(item).copied()
}
/// Salsa query. This will look for lang items in a specific crate.
pub(crate) fn crate_lang_items_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<LangItems> {
let _p = profile::span("crate_lang_items_query");
let mut lang_items = LangItems::default();
let crate_def_map = db.crate_def_map(krate);
for (_, module_data) in crate_def_map.modules() {
for impl_def in module_data.scope.impls() {
lang_items.collect_lang_item(db, impl_def, LangItemTarget::ImplDefId)
}
for def in module_data.scope.declarations() {
match def {
ModuleDefId::TraitId(trait_) => {
lang_items.collect_lang_item(db, trait_, LangItemTarget::TraitId);
db.trait_data(trait_).items.iter().for_each(|&(_, assoc_id)| {
if let crate::AssocItemId::FunctionId(f) = assoc_id {
lang_items.collect_lang_item(db, f, LangItemTarget::FunctionId);
}
});
}
ModuleDefId::AdtId(AdtId::EnumId(e)) => {
lang_items.collect_lang_item(db, e, LangItemTarget::EnumId);
db.enum_data(e).variants.iter().for_each(|(local_id, _)| {
lang_items.collect_lang_item(
db,
EnumVariantId { parent: e, local_id },
LangItemTarget::EnumVariantId,
);
});
}
ModuleDefId::AdtId(AdtId::StructId(s)) => {
lang_items.collect_lang_item(db, s, LangItemTarget::StructId);
}
ModuleDefId::FunctionId(f) => {
lang_items.collect_lang_item(db, f, LangItemTarget::FunctionId);
}
ModuleDefId::StaticId(s) => {
lang_items.collect_lang_item(db, s, LangItemTarget::StaticId);
}
_ => {}
}
}
}
Arc::new(lang_items)
}
/// Salsa query. Look for a lang item, starting from the specified crate and recursively
/// traversing its dependencies.
pub(crate) fn lang_item_query(
db: &dyn DefDatabase,
start_crate: CrateId,
item: SmolStr,
) -> Option<LangItemTarget> {
let _p = profile::span("lang_item_query");
let lang_items = db.crate_lang_items(start_crate);
let start_crate_target = lang_items.items.get(&item);
if let Some(&target) = start_crate_target {
return Some(target);
}
db.crate_graph()[start_crate]
.dependencies
.iter()
.find_map(|dep| db.lang_item(dep.crate_id, item.clone()))
}
fn collect_lang_item<T>(
&mut self,
db: &dyn DefDatabase,
item: T,
constructor: fn(T) -> LangItemTarget,
) where
T: Into<AttrDefId> + Copy,
{
let _p = profile::span("collect_lang_item");
if let Some(lang_item_name) = lang_attr(db, item) {
self.items.entry(lang_item_name).or_insert_with(|| constructor(item));
}
}
}
pub fn lang_attr(db: &dyn DefDatabase, item: impl Into<AttrDefId> + Copy) -> Option<SmolStr> {
let attrs = db.attrs(item.into());
attrs.by_key("lang").string_value().cloned()
}
|
