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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
use rustc_ast::ast;
use rustc_ast::visit;
use rustc_ast::visit::Visitor;
use rustc_ast::Crate;
use rustc_ast::EnumDef;
use rustc_ast::ForeignMod;
use rustc_ast::NodeId;
use rustc_hir::def_id::LocalDefId;
use rustc_hir::def_id::CRATE_DEF_ID;
use rustc_middle::middle::privacy::AccessLevel;
use rustc_middle::ty::Visibility;
use rustc_span::sym;
use crate::imports::ImportKind;
use crate::BindingKey;
use crate::NameBinding;
use crate::NameBindingKind;
use crate::Resolver;
pub struct AccessLevelsVisitor<'r, 'a> {
r: &'r mut Resolver<'a>,
prev_level: Option<AccessLevel>,
changed: bool,
}
impl<'r, 'a> AccessLevelsVisitor<'r, 'a> {
/// Fills the `Resolver::access_levels` table with public & exported items
/// For now, this doesn't resolve macros (FIXME) and cannot resolve Impl, as we
/// need access to a TyCtxt for that.
pub fn compute_access_levels<'c>(r: &'r mut Resolver<'a>, krate: &'c Crate) {
let mut visitor =
AccessLevelsVisitor { r, changed: false, prev_level: Some(AccessLevel::Public) };
visitor.set_access_level_def_id(CRATE_DEF_ID, Some(AccessLevel::Public));
visitor.set_exports_access_level(CRATE_DEF_ID);
while visitor.changed {
visitor.reset();
visit::walk_crate(&mut visitor, krate);
}
tracing::info!("resolve::access_levels: {:#?}", r.access_levels);
}
fn reset(&mut self) {
self.changed = false;
self.prev_level = Some(AccessLevel::Public);
}
/// Update the access level of the exports of the given module accordingly. The module access
/// level has to be Exported or Public.
/// This will also follow `use` chains (see PrivacyVisitor::set_import_binding_access_level).
fn set_exports_access_level(&mut self, module_id: LocalDefId) {
assert!(self.r.module_map.contains_key(&&module_id.to_def_id()));
// Set the given binding access level to `AccessLevel::Public` and
// sets the rest of the `use` chain to `AccessLevel::Exported` until
// we hit the actual exported item.
let set_import_binding_access_level =
|this: &mut Self, mut binding: &NameBinding<'a>, mut access_level| {
while let NameBindingKind::Import { binding: nested_binding, import, .. } =
binding.kind
{
this.set_access_level(import.id, access_level);
if let ImportKind::Single { additional_ids, .. } = import.kind {
this.set_access_level(additional_ids.0, access_level);
this.set_access_level(additional_ids.1, access_level);
}
access_level = Some(AccessLevel::Exported);
binding = nested_binding;
}
};
let module_level = self.r.access_levels.map.get(&module_id).copied();
assert!(module_level >= Some(AccessLevel::Exported));
if let Some(exports) = self.r.reexport_map.get(&module_id) {
let pub_exports = exports
.iter()
.filter(|ex| ex.vis == Visibility::Public)
.cloned()
.collect::<Vec<_>>();
let module = self.r.get_module(module_id.to_def_id()).unwrap();
for export in pub_exports.into_iter() {
if let Some(export_def_id) = export.res.opt_def_id().and_then(|id| id.as_local()) {
self.set_access_level_def_id(export_def_id, Some(AccessLevel::Exported));
}
if let Some(ns) = export.res.ns() {
let key = BindingKey { ident: export.ident, ns, disambiguator: 0 };
let name_res = self.r.resolution(module, key);
if let Some(binding) = name_res.borrow().binding() {
set_import_binding_access_level(self, binding, module_level)
}
}
}
}
}
/// Sets the access level of the `LocalDefId` corresponding to the given `NodeId`.
/// This function will panic if the `NodeId` does not have a `LocalDefId`
fn set_access_level(
&mut self,
node_id: NodeId,
access_level: Option<AccessLevel>,
) -> Option<AccessLevel> {
self.set_access_level_def_id(self.r.local_def_id(node_id), access_level)
}
fn set_access_level_def_id(
&mut self,
def_id: LocalDefId,
access_level: Option<AccessLevel>,
) -> Option<AccessLevel> {
let old_level = self.r.access_levels.map.get(&def_id).copied();
if old_level < access_level {
self.r.access_levels.map.insert(def_id, access_level.unwrap());
self.changed = true;
access_level
} else {
old_level
}
}
}
impl<'r, 'ast> Visitor<'ast> for AccessLevelsVisitor<'ast, 'r> {
fn visit_item(&mut self, item: &'ast ast::Item) {
let inherited_item_level = match item.kind {
// Resolved in rustc_privacy when types are available
ast::ItemKind::Impl(..) => return,
// Only exported `macro_rules!` items are public, but they always are
ast::ItemKind::MacroDef(ref macro_def) if macro_def.macro_rules => {
let is_macro_export =
item.attrs.iter().any(|attr| attr.has_name(sym::macro_export));
if is_macro_export { Some(AccessLevel::Public) } else { None }
}
// Foreign modules inherit level from parents.
ast::ItemKind::ForeignMod(..) => self.prev_level,
// Other `pub` items inherit levels from parents.
ast::ItemKind::ExternCrate(..)
| ast::ItemKind::Use(..)
| ast::ItemKind::Static(..)
| ast::ItemKind::Const(..)
| ast::ItemKind::Fn(..)
| ast::ItemKind::Mod(..)
| ast::ItemKind::GlobalAsm(..)
| ast::ItemKind::TyAlias(..)
| ast::ItemKind::Enum(..)
| ast::ItemKind::Struct(..)
| ast::ItemKind::Union(..)
| ast::ItemKind::Trait(..)
| ast::ItemKind::TraitAlias(..)
| ast::ItemKind::MacroDef(..) => {
if item.vis.kind.is_pub() {
self.prev_level
} else {
None
}
}
// Should be unreachable at this stage
ast::ItemKind::MacCall(..) => panic!(
"ast::ItemKind::MacCall encountered, this should not anymore appear at this stage"
),
};
let access_level = self.set_access_level(item.id, inherited_item_level);
// Set access level of nested items.
// If it's a mod, also make the visitor walk all of its items
match item.kind {
ast::ItemKind::Mod(..) => {
if access_level.is_some() {
self.set_exports_access_level(self.r.local_def_id(item.id));
}
let orig_level = std::mem::replace(&mut self.prev_level, access_level);
visit::walk_item(self, item);
self.prev_level = orig_level;
}
ast::ItemKind::ForeignMod(ForeignMod { ref items, .. }) => {
for nested in items {
if nested.vis.kind.is_pub() {
self.set_access_level(nested.id, access_level);
}
}
}
ast::ItemKind::Enum(EnumDef { ref variants }, _) => {
for variant in variants {
let variant_level = self.set_access_level(variant.id, access_level);
if let Some(ctor_id) = variant.data.ctor_id() {
self.set_access_level(ctor_id, access_level);
}
for field in variant.data.fields() {
self.set_access_level(field.id, variant_level);
}
}
}
ast::ItemKind::Struct(ref def, _) | ast::ItemKind::Union(ref def, _) => {
if let Some(ctor_id) = def.ctor_id() {
self.set_access_level(ctor_id, access_level);
}
for field in def.fields() {
if field.vis.kind.is_pub() {
self.set_access_level(field.id, access_level);
}
}
}
ast::ItemKind::Trait(ref trait_kind) => {
for nested in trait_kind.items.iter() {
self.set_access_level(nested.id, access_level);
}
}
ast::ItemKind::ExternCrate(..)
| ast::ItemKind::Use(..)
| ast::ItemKind::Static(..)
| ast::ItemKind::Const(..)
| ast::ItemKind::GlobalAsm(..)
| ast::ItemKind::TyAlias(..)
| ast::ItemKind::TraitAlias(..)
| ast::ItemKind::MacroDef(..)
| ast::ItemKind::Fn(..) => return,
// Unreachable kinds
ast::ItemKind::Impl(..) | ast::ItemKind::MacCall(..) => unreachable!(),
}
}
}
|
