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
|
//! Defines database & queries for macro expansion.
use std::sync::Arc;
use mbe::MacroRules;
use ra_db::{salsa, SourceDatabase};
use ra_parser::FragmentKind;
use ra_prof::profile;
use ra_syntax::{AstNode, Parse, SyntaxKind::*, SyntaxNode};
use crate::{
ast_id_map::AstIdMap, BuiltinDeriveExpander, BuiltinFnLikeExpander, HirFileId, HirFileIdRepr,
MacroCallId, MacroCallLoc, MacroDefId, MacroDefKind, MacroFile,
};
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum TokenExpander {
MacroRules(mbe::MacroRules),
Builtin(BuiltinFnLikeExpander),
BuiltinDerive(BuiltinDeriveExpander),
}
impl TokenExpander {
pub fn expand(
&self,
db: &dyn AstDatabase,
id: MacroCallId,
tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
match self {
TokenExpander::MacroRules(it) => it.expand(tt),
TokenExpander::Builtin(it) => it.expand(db, id, tt),
TokenExpander::BuiltinDerive(it) => it.expand(db, id, tt),
}
}
pub fn map_id_down(&self, id: tt::TokenId) -> tt::TokenId {
match self {
TokenExpander::MacroRules(it) => it.map_id_down(id),
TokenExpander::Builtin(..) => id,
TokenExpander::BuiltinDerive(..) => id,
}
}
pub fn map_id_up(&self, id: tt::TokenId) -> (tt::TokenId, mbe::Origin) {
match self {
TokenExpander::MacroRules(it) => it.map_id_up(id),
TokenExpander::Builtin(..) => (id, mbe::Origin::Call),
TokenExpander::BuiltinDerive(..) => (id, mbe::Origin::Call),
}
}
}
// FIXME: rename to ExpandDatabase
#[salsa::query_group(AstDatabaseStorage)]
pub trait AstDatabase: SourceDatabase {
fn ast_id_map(&self, file_id: HirFileId) -> Arc<AstIdMap>;
#[salsa::transparent]
fn parse_or_expand(&self, file_id: HirFileId) -> Option<SyntaxNode>;
#[salsa::interned]
fn intern_macro(&self, macro_call: MacroCallLoc) -> MacroCallId;
fn macro_arg(&self, id: MacroCallId) -> Option<Arc<(tt::Subtree, mbe::TokenMap)>>;
fn macro_def(&self, id: MacroDefId) -> Option<Arc<(TokenExpander, mbe::TokenMap)>>;
fn parse_macro(&self, macro_file: MacroFile)
-> Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>;
fn macro_expand(&self, macro_call: MacroCallId) -> Result<Arc<tt::Subtree>, String>;
}
pub(crate) fn ast_id_map(db: &dyn AstDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
let map =
db.parse_or_expand(file_id).map_or_else(AstIdMap::default, |it| AstIdMap::from_source(&it));
Arc::new(map)
}
pub(crate) fn macro_def(
db: &dyn AstDatabase,
id: MacroDefId,
) -> Option<Arc<(TokenExpander, mbe::TokenMap)>> {
match id.kind {
MacroDefKind::Declarative => {
let macro_call = id.ast_id?.to_node(db);
let arg = macro_call.token_tree()?;
let (tt, tmap) = mbe::ast_to_token_tree(&arg).or_else(|| {
log::warn!("fail on macro_def to token tree: {:#?}", arg);
None
})?;
let rules = MacroRules::parse(&tt).ok().or_else(|| {
log::warn!("fail on macro_def parse: {:#?}", tt);
None
})?;
Some(Arc::new((TokenExpander::MacroRules(rules), tmap)))
}
MacroDefKind::BuiltIn(expander) => {
Some(Arc::new((TokenExpander::Builtin(expander), mbe::TokenMap::default())))
}
MacroDefKind::BuiltInDerive(expander) => {
Some(Arc::new((TokenExpander::BuiltinDerive(expander), mbe::TokenMap::default())))
}
}
}
pub(crate) fn macro_arg(
db: &dyn AstDatabase,
id: MacroCallId,
) -> Option<Arc<(tt::Subtree, mbe::TokenMap)>> {
let loc = db.lookup_intern_macro(id);
let arg = loc.kind.arg(db)?;
let (tt, tmap) = mbe::syntax_node_to_token_tree(&arg)?;
Some(Arc::new((tt, tmap)))
}
pub(crate) fn macro_expand(
db: &dyn AstDatabase,
id: MacroCallId,
) -> Result<Arc<tt::Subtree>, String> {
let loc = db.lookup_intern_macro(id);
let macro_arg = db.macro_arg(id).ok_or("Fail to args in to tt::TokenTree")?;
let macro_rules = db.macro_def(loc.def).ok_or("Fail to find macro definition")?;
let tt = macro_rules.0.expand(db, id, ¯o_arg.0).map_err(|err| format!("{:?}", err))?;
// Set a hard limit for the expanded tt
let count = tt.count();
if count > 65536 {
return Err(format!("Total tokens count exceed limit : count = {}", count));
}
Ok(Arc::new(tt))
}
pub(crate) fn parse_or_expand(db: &dyn AstDatabase, file_id: HirFileId) -> Option<SyntaxNode> {
match file_id.0 {
HirFileIdRepr::FileId(file_id) => Some(db.parse(file_id).tree().syntax().clone()),
HirFileIdRepr::MacroFile(macro_file) => {
db.parse_macro(macro_file).map(|(it, _)| it.syntax_node())
}
}
}
pub(crate) fn parse_macro(
db: &dyn AstDatabase,
macro_file: MacroFile,
) -> Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)> {
let _p = profile("parse_macro_query");
let macro_call_id = macro_file.macro_call_id;
let tt = db
.macro_expand(macro_call_id)
.map_err(|err| {
// Note:
// The final goal we would like to make all parse_macro success,
// such that the following log will not call anyway.
log::warn!("fail on macro_parse: (reason: {})", err,);
})
.ok()?;
let fragment_kind = to_fragment_kind(db, macro_call_id);
let (parse, rev_token_map) = mbe::token_tree_to_syntax_node(&tt, fragment_kind).ok()?;
Some((parse, Arc::new(rev_token_map)))
}
/// Given a `MacroCallId`, return what `FragmentKind` it belongs to.
/// FIXME: Not completed
fn to_fragment_kind(db: &dyn AstDatabase, macro_call_id: MacroCallId) -> FragmentKind {
let syn = db.lookup_intern_macro(macro_call_id).kind.node(db).value;
let parent = match syn.parent() {
Some(it) => it,
None => {
// FIXME:
// If it is root, which means the parent HirFile
// MacroKindFile must be non-items
// return expr now.
return FragmentKind::Expr;
}
};
match parent.kind() {
MACRO_ITEMS | SOURCE_FILE => FragmentKind::Items,
LET_STMT => {
// FIXME: Handle Pattern
FragmentKind::Expr
}
// FIXME: Expand to statements in appropriate positions; HIR lowering needs to handle that
EXPR_STMT | BLOCK => FragmentKind::Expr,
ARG_LIST => FragmentKind::Expr,
TRY_EXPR => FragmentKind::Expr,
TUPLE_EXPR => FragmentKind::Expr,
PAREN_EXPR => FragmentKind::Expr,
ITEM_LIST => FragmentKind::Items,
_ => {
// Unknown , Just guess it is `Items`
FragmentKind::Items
}
}
}
|
