aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir/src/ids.rs
blob: eb9939df790f57b05fda1413fbe52bb453c611c8 (plain)
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
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
use std::{
    hash::{Hash, Hasher},
    sync::Arc,
};

use ra_db::{LocationInterner, FileId};
use ra_syntax::{TreeArc, SourceFile, AstNode, ast};
use ra_arena::{RawId, ArenaId, impl_arena_id};
use mbe::MacroRules;

use crate::{
    Module, DefDatabase, AstId, FileAstId,
};

#[derive(Debug, Default)]
pub struct HirInterner {
    macros: LocationInterner<MacroCallLoc, MacroCallId>,
    fns: LocationInterner<ItemLoc<ast::FnDef>, FunctionId>,
    structs: LocationInterner<ItemLoc<ast::StructDef>, StructId>,
    enums: LocationInterner<ItemLoc<ast::EnumDef>, EnumId>,
    consts: LocationInterner<ItemLoc<ast::ConstDef>, ConstId>,
    statics: LocationInterner<ItemLoc<ast::StaticDef>, StaticId>,
    traits: LocationInterner<ItemLoc<ast::TraitDef>, TraitId>,
    types: LocationInterner<ItemLoc<ast::TypeAliasDef>, TypeAliasId>,
}

impl HirInterner {
    pub fn len(&self) -> usize {
        self.macros.len()
            + self.fns.len()
            + self.structs.len()
            + self.enums.len()
            + self.consts.len()
            + self.statics.len()
            + self.traits.len()
            + self.types.len()
    }
}

/// hir makes heavy use of ids: integer (u32) handlers to various things. You
/// can think of id as a pointer (but without a lifetime) or a file descriptor
/// (but for hir objects).
///
/// This module defines a bunch of ids we are using. The most important ones are
/// probably `HirFileId` and `DefId`.

/// Input to the analyzer is a set of files, where each file is identified by
/// `FileId` and contains source code. However, another source of source code in
/// Rust are macros: each macro can be thought of as producing a "temporary
/// file". To assign an id to such a file, we use the id of the macro call that
/// produced the file. So, a `HirFileId` is either a `FileId` (source code
/// written by user), or a `MacroCallId` (source code produced by macro).
///
/// What is a `MacroCallId`? Simplifying, it's a `HirFileId` of a file
/// containing the call plus the offset of the macro call in the file. Note that
/// this is a recursive definition! However, the size_of of `HirFileId` is
/// finite (because everything bottoms out at the real `FileId`) and small
/// (`MacroCallId` uses the location interner).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct HirFileId(HirFileIdRepr);

impl HirFileId {
    /// For macro-expansion files, returns the file original source file the
    /// expansion originated from.
    pub fn original_file(self, db: &impl DefDatabase) -> FileId {
        match self.0 {
            HirFileIdRepr::File(file_id) => file_id,
            HirFileIdRepr::Macro(macro_call_id) => {
                let loc = macro_call_id.loc(db);
                loc.ast_id.file_id().original_file(db)
            }
        }
    }

    /// XXX: this is a temporary function, which should go away when we implement the
    /// nameresolution+macro expansion combo. Prefer using `original_file` if
    /// possible.
    pub fn as_original_file(self) -> FileId {
        match self.0 {
            HirFileIdRepr::File(file_id) => file_id,
            HirFileIdRepr::Macro(_r) => panic!("macro generated file: {:?}", self),
        }
    }

    pub(crate) fn hir_parse_query(
        db: &impl DefDatabase,
        file_id: HirFileId,
    ) -> TreeArc<SourceFile> {
        match file_id.0 {
            HirFileIdRepr::File(file_id) => db.parse(file_id),
            HirFileIdRepr::Macro(macro_call_id) => {
                // returning an empty string looks fishy...
                parse_macro(db, macro_call_id).unwrap_or_else(|| SourceFile::parse(""))
            }
        }
    }
}

fn parse_macro(db: &impl DefDatabase, macro_call_id: MacroCallId) -> Option<TreeArc<SourceFile>> {
    let loc = macro_call_id.loc(db);
    let macro_call = loc.ast_id.to_node(db);
    let (macro_arg, _) = macro_call.token_tree().and_then(mbe::ast_to_token_tree)?;

    let macro_rules = db.macro_def(loc.def)?;
    let tt = macro_rules.expand(&macro_arg).ok()?;
    Some(mbe::token_tree_to_ast_item_list(&tt))
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
enum HirFileIdRepr {
    File(FileId),
    Macro(MacroCallId),
}

impl From<FileId> for HirFileId {
    fn from(file_id: FileId) -> HirFileId {
        HirFileId(HirFileIdRepr::File(file_id))
    }
}

impl From<MacroCallId> for HirFileId {
    fn from(macro_call_id: MacroCallId) -> HirFileId {
        HirFileId(HirFileIdRepr::Macro(macro_call_id))
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroDefId(pub(crate) AstId<ast::MacroCall>);

pub(crate) fn macro_def_query(db: &impl DefDatabase, id: MacroDefId) -> Option<Arc<MacroRules>> {
    let macro_call = id.0.to_node(db);
    let arg = macro_call.token_tree()?;
    let (tt, _) = mbe::ast_to_token_tree(arg)?;
    let rules = MacroRules::parse(&tt).ok()?;
    Some(Arc::new(rules))
}

/// `MacroCallId` identifies a particular macro invocation, like
/// `println!("Hello, {}", world)`.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroCallId(RawId);
impl_arena_id!(MacroCallId);

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MacroCallLoc {
    pub(crate) def: MacroDefId,
    pub(crate) ast_id: AstId<ast::MacroCall>,
}

impl MacroCallId {
    pub(crate) fn loc(self, db: &impl AsRef<HirInterner>) -> MacroCallLoc {
        db.as_ref().macros.id2loc(self)
    }
}

impl MacroCallLoc {
    pub(crate) fn id(&self, db: &impl AsRef<HirInterner>) -> MacroCallId {
        db.as_ref().macros.loc2id(&self)
    }
}

#[derive(Debug)]
pub struct ItemLoc<N: AstNode> {
    pub(crate) module: Module,
    ast_id: AstId<N>,
}

impl<N: AstNode> PartialEq for ItemLoc<N> {
    fn eq(&self, other: &Self) -> bool {
        self.module == other.module && self.ast_id == other.ast_id
    }
}
impl<N: AstNode> Eq for ItemLoc<N> {}
impl<N: AstNode> Hash for ItemLoc<N> {
    fn hash<H: Hasher>(&self, hasher: &mut H) {
        self.module.hash(hasher);
        self.ast_id.hash(hasher);
    }
}

impl<N: AstNode> Clone for ItemLoc<N> {
    fn clone(&self) -> ItemLoc<N> {
        ItemLoc { module: self.module, ast_id: self.ast_id }
    }
}

#[derive(Clone, Copy)]
pub(crate) struct LocationCtx<DB> {
    db: DB,
    module: Module,
    file_id: HirFileId,
}

impl<'a, DB: DefDatabase> LocationCtx<&'a DB> {
    pub(crate) fn new(db: &'a DB, module: Module, file_id: HirFileId) -> LocationCtx<&'a DB> {
        LocationCtx { db, module, file_id }
    }
    pub(crate) fn to_def<N, DEF>(self, ast: &N) -> DEF
    where
        N: AstNode,
        DEF: AstItemDef<N>,
    {
        DEF::from_ast(self, ast)
    }
}

pub(crate) trait AstItemDef<N: AstNode>: ArenaId + Clone {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<N>, Self>;
    fn from_ast(ctx: LocationCtx<&impl DefDatabase>, ast: &N) -> Self {
        let items = ctx.db.ast_id_map(ctx.file_id);
        let item_id = items.ast_id(ast);
        Self::from_ast_id(ctx, item_id)
    }
    fn from_ast_id(ctx: LocationCtx<&impl DefDatabase>, ast_id: FileAstId<N>) -> Self {
        let loc = ItemLoc { module: ctx.module, ast_id: ast_id.with_file_id(ctx.file_id) };
        Self::interner(ctx.db.as_ref()).loc2id(&loc)
    }
    fn source(self, db: &impl DefDatabase) -> (HirFileId, TreeArc<N>) {
        let int = Self::interner(db.as_ref());
        let loc = int.id2loc(self);
        let ast = loc.ast_id.to_node(db);
        (loc.ast_id.file_id(), ast)
    }
    fn module(self, db: &impl DefDatabase) -> Module {
        let int = Self::interner(db.as_ref());
        let loc = int.id2loc(self);
        loc.module
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct FunctionId(RawId);
impl_arena_id!(FunctionId);
impl AstItemDef<ast::FnDef> for FunctionId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::FnDef>, Self> {
        &interner.fns
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct StructId(RawId);
impl_arena_id!(StructId);
impl AstItemDef<ast::StructDef> for StructId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::StructDef>, Self> {
        &interner.structs
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct EnumId(RawId);
impl_arena_id!(EnumId);
impl AstItemDef<ast::EnumDef> for EnumId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::EnumDef>, Self> {
        &interner.enums
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct ConstId(RawId);
impl_arena_id!(ConstId);
impl AstItemDef<ast::ConstDef> for ConstId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::ConstDef>, Self> {
        &interner.consts
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct StaticId(RawId);
impl_arena_id!(StaticId);
impl AstItemDef<ast::StaticDef> for StaticId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::StaticDef>, Self> {
        &interner.statics
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct TraitId(RawId);
impl_arena_id!(TraitId);
impl AstItemDef<ast::TraitDef> for TraitId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::TraitDef>, Self> {
        &interner.traits
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub(crate) struct TypeAliasId(RawId);
impl_arena_id!(TypeAliasId);
impl AstItemDef<ast::TypeAliasDef> for TypeAliasId {
    fn interner(interner: &HirInterner) -> &LocationInterner<ItemLoc<ast::TypeAliasDef>, Self> {
        &interner.types
    }
}