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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
//
// Copyright (c) 2022, Olof Kraigher olof.kraigher@gmail.com
use super::analyze::*;
use super::region::*;
use crate::ast::*;
use crate::data::*;
use std::sync::Arc;
// Represent a resolved name which can be either a
// 1. NonObject such as a library or design unit
// 2. Object such a direct reference to an object or some kind of index, slice or selected name
#[derive(Debug)]
pub enum ResolvedName {
NonObject(Arc<NamedEntity>),
Type(TypeEnt),
Overloaded(OverloadedName),
ObjectSelection {
base_object: ObjectEnt,
type_mark: TypeEnt,
},
ExternalName {
class: ExternalObjectClass,
type_mark: TypeEnt,
},
}
impl ResolvedName {
fn new(ent: Arc<NamedEntity>) -> Self {
match ent.kind() {
NamedEntityKind::Object(object) => {
let type_mark = object.subtype.type_mark().to_owned();
Self::ObjectSelection {
base_object: ObjectEnt::new(ent),
type_mark,
}
}
NamedEntityKind::ObjectAlias {
base_object,
type_mark,
} => Self::ObjectSelection {
base_object: base_object.clone(),
type_mark: type_mark.to_owned(),
},
NamedEntityKind::Type(_) => ResolvedName::Type(TypeEnt::from_any(ent).unwrap()),
_ => Self::NonObject(ent),
}
}
fn with_suffix(self, ent: Arc<NamedEntity>) -> Result<Self, String> {
match ent.kind() {
NamedEntityKind::Object(..) => {
debug_assert!(matches!(self, Self::NonObject(_)));
Ok(Self::new(ent))
}
NamedEntityKind::ObjectAlias { .. } => {
debug_assert!(matches!(self, Self::NonObject(_)));
Ok(Self::new(ent))
}
_ => {
match self {
Self::NonObject(_) => Ok(match TypeEnt::from_any(ent) {
Ok(typ) => Self::Type(typ),
Err(ent) => Self::NonObject(ent),
}),
Self::Type(_) => {
Err("Type may not be the prefix of a selected name".to_owned())
}
Self::ObjectSelection { base_object, .. } => match ent.actual_kind() {
NamedEntityKind::ElementDeclaration(subtype) => Ok(Self::ObjectSelection {
base_object,
type_mark: subtype.type_mark().to_owned(),
}),
_ => Ok(Self::NonObject(ent)),
},
Self::ExternalName { class, .. } => match ent.actual_kind() {
NamedEntityKind::ElementDeclaration(subtype) => Ok(Self::ExternalName {
class,
type_mark: subtype.type_mark().to_owned(),
}),
// @TODO this is probably an error
_ => Ok(Self::NonObject(ent)),
},
Self::Overloaded(..) => {
unreachable!("Overloaded suffix of overloaded name");
}
}
}
}
}
}
impl<'a> AnalyzeContext<'a> {
// Helper function:
// Resolve a name that must be some kind of object selection, index or slice
// Such names occur as assignment targets and aliases
// Takes an error message as an argument to be re-usable
pub fn resolve_object_prefix(
&self,
region: &Region<'_>,
name_pos: &SrcPos,
name: &mut Name,
err_msg: &'static str,
diagnostics: &mut dyn DiagnosticHandler,
) -> AnalysisResult<ResolvedName> {
match name {
Name::Selected(prefix, suffix) => {
suffix.clear_reference();
let resolved = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
)?;
match resolved {
ResolvedName::NonObject(ref ent) => {
match self.lookup_selected(&prefix.pos, ent, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
resolved
.with_suffix(named_entity)
.map_err(|e| Diagnostic::error(name_pos, e).into())
}
NamedEntities::Overloaded(overloaded) => {
// Could be used for an alias of a subprogram
Ok(ResolvedName::Overloaded(overloaded))
}
}
}
ResolvedName::Type(..) => Err(Diagnostic::error(name_pos, err_msg).into()),
ResolvedName::ObjectSelection { ref type_mark, .. } => {
match self.lookup_type_selected(&prefix.pos, type_mark, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
resolved
.with_suffix(named_entity)
.map_err(|e| Diagnostic::error(name_pos, e).into())
}
NamedEntities::Overloaded(..) => {
// Probably a protected type method, this can never be aliased or a target
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
ResolvedName::ExternalName { ref type_mark, .. } => {
match self.lookup_type_selected(&prefix.pos, type_mark, suffix)? {
NamedEntities::Single(named_entity) => {
suffix.set_unique_reference(&named_entity);
resolved
.with_suffix(named_entity)
.map_err(|e| Diagnostic::error(name_pos, e).into())
}
NamedEntities::Overloaded(..) => {
// Probably a protected type method, this can never be aliased or a target
// Likely a user error
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
ResolvedName::Overloaded(..) => {
// Overloaded suffix of overloaded name is not possible
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
}
Name::SelectedAll(prefix) => self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
),
Name::Designator(designator) => {
designator.clear_reference();
match region.lookup_within(name_pos, designator.designator())? {
NamedEntities::Single(named_entity) => {
designator.set_unique_reference(&named_entity);
Ok(ResolvedName::new(named_entity))
}
NamedEntities::Overloaded(overloaded) => {
// Could be used for an alias of a subprogram
Ok(ResolvedName::Overloaded(overloaded))
}
}
}
Name::Indexed(ref mut prefix, ref mut indexes) => {
let resolved = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
);
if let Ok(ResolvedName::ObjectSelection {
base_object,
type_mark,
}) = resolved
{
let elem_type = self.analyze_indexed_name(
region,
name_pos,
prefix.suffix_pos(),
&type_mark,
indexes,
diagnostics,
)?;
Ok(ResolvedName::ObjectSelection {
base_object,
type_mark: elem_type,
})
} else {
for expr in indexes.iter_mut() {
self.analyze_expression(region, expr, diagnostics)?;
}
Err(Diagnostic::error(&prefix.pos, err_msg).into())
}
}
Name::Slice(ref mut prefix, ref mut drange) => {
let res = self.resolve_object_prefix(
region,
&prefix.pos,
&mut prefix.item,
err_msg,
diagnostics,
);
if let Ok(ResolvedName::ObjectSelection { ref type_mark, .. }) = res {
self.analyze_sliced_name(prefix.suffix_pos(), type_mark, diagnostics)?;
}
self.analyze_discrete_range(region, drange.as_mut(), diagnostics)?;
res
}
Name::Attribute(..) => Err(Diagnostic::error(name_pos, err_msg).into()),
Name::FunctionCall(ref mut fcall) => {
if let Some((prefix, indexes)) = fcall.to_indexed() {
*name = Name::Indexed(prefix, indexes);
self.resolve_object_prefix(region, name_pos, name, err_msg, diagnostics)
} else {
Err(Diagnostic::error(name_pos, err_msg).into())
}
}
Name::External(ref mut ename) => {
let ExternalName { subtype, class, .. } = ename.as_mut();
let subtype = self.resolve_subtype_indication(region, subtype, diagnostics)?;
Ok(ResolvedName::ExternalName {
class: *class,
type_mark: subtype.type_mark().to_owned(),
})
}
}
}
}