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
|
//! ra_db defines basic database traits. The concrete DB is defined by ra_ide_api.
mod cancellation;
mod input;
mod loc2id;
pub mod mock;
use std::{
panic, sync::Arc,
};
use ra_syntax::{TextUnit, TextRange, SourceFile, TreeArc};
use relative_path::RelativePathBuf;
pub use ::salsa as salsa;
pub use crate::{
cancellation::Canceled,
input::{
FileId, CrateId, SourceRoot, SourceRootId, CrateGraph, Dependency,
},
loc2id::LocationIntener,
};
pub trait BaseDatabase: salsa::Database + panic::RefUnwindSafe {
/// Aborts current query if there are pending changes.
///
/// rust-analyzer needs to be able to answer semantic questions about the
/// code while the code is being modified. A common problem is that a
/// long-running query is being calculated when a new change arrives.
///
/// We can't just apply the change immediately: this will cause the pending
/// query to see inconsistent state (it will observe an absence of
/// repeatable read). So what we do is we **cancel** all pending queries
/// before applying the change.
///
/// We implement cancellation by panicking with a special value and catching
/// it on the API boundary. Salsa explicitly supports this use-case.
fn check_canceled(&self) {
if self.salsa_runtime().is_current_revision_canceled() {
Canceled::throw()
}
}
fn catch_canceled<F: FnOnce(&Self) -> T + panic::UnwindSafe, T>(
&self,
f: F,
) -> Result<T, Canceled> {
panic::catch_unwind(|| f(self)).map_err(|err| match err.downcast::<Canceled>() {
Ok(canceled) => *canceled,
Err(payload) => panic::resume_unwind(payload),
})
}
}
#[derive(Clone, Copy, Debug)]
pub struct FilePosition {
pub file_id: FileId,
pub offset: TextUnit,
}
#[derive(Clone, Copy, Debug)]
pub struct FileRange {
pub file_id: FileId,
pub range: TextRange,
}
#[salsa::query_group(FilesDatabaseStorage)]
pub trait FilesDatabase: salsa::Database {
/// Text of the file.
#[salsa::input]
fn file_text(&self, file_id: FileId) -> Arc<String>;
/// Path to a file, relative to the root of its source root.
#[salsa::input]
fn file_relative_path(&self, file_id: FileId) -> RelativePathBuf;
/// Source root of the file.
#[salsa::input]
fn file_source_root(&self, file_id: FileId) -> SourceRootId;
/// Contents of the source root.
#[salsa::input]
fn source_root(&self, id: SourceRootId) -> Arc<SourceRoot>;
fn source_root_crates(&self, id: SourceRootId) -> Arc<Vec<CrateId>>;
/// The set of "local" (that is, from the current workspace) roots.
/// Files in local roots are assumed to change frequently.
#[salsa::input]
fn local_roots(&self) -> Arc<Vec<SourceRootId>>;
/// The set of roots for crates.io libraries.
/// Files in libraries are assumed to never change.
#[salsa::input]
fn library_roots(&self) -> Arc<Vec<SourceRootId>>;
/// The crate graph.
#[salsa::input]
fn crate_graph(&self) -> Arc<CrateGraph>;
}
fn source_root_crates(db: &impl FilesDatabase, id: SourceRootId) -> Arc<Vec<CrateId>> {
let root = db.source_root(id);
let graph = db.crate_graph();
let res = root
.files
.values()
.filter_map(|&it| graph.crate_id_for_crate_root(it))
.collect::<Vec<_>>();
Arc::new(res)
}
#[salsa::query_group(SyntaxDatabaseStorage)]
pub trait SyntaxDatabase: FilesDatabase + BaseDatabase {
fn source_file(&self, file_id: FileId) -> TreeArc<SourceFile>;
}
fn source_file(db: &impl SyntaxDatabase, file_id: FileId) -> TreeArc<SourceFile> {
let text = db.file_text(file_id);
SourceFile::parse(&*text)
}
|
