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Fix eager macro input spans being discarded
1 parent c11737c commit efa6729

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5 files changed

+101
-94
lines changed

5 files changed

+101
-94
lines changed

crates/hir-def/src/macro_expansion_tests/mbe.rs

Lines changed: 47 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -93,52 +93,86 @@ fn eager_expands_with_unresolved_within() {
9393
r#"
9494
#[rustc_builtin_macro]
9595
#[macro_export]
96-
macro_rules! format_args {}
96+
macro_rules! concat {}
97+
macro_rules! identity {
98+
($tt:tt) => {
99+
$tt
100+
}
101+
}
97102
98103
fn main(foo: ()) {
99-
format_args!("{} {} {}", format_args!("{}", 0), foo, identity!(10), "bar")
104+
concat!("hello", identity!("world"), unresolved!(), identity!("!"));
100105
}
101106
"#,
102107
expect![[r##"
103108
#[rustc_builtin_macro]
104109
#[macro_export]
105-
macro_rules! format_args {}
110+
macro_rules! concat {}
111+
macro_rules! identity {
112+
($tt:tt) => {
113+
$tt
114+
}
115+
}
106116
107117
fn main(foo: ()) {
108-
builtin #format_args ("{} {} {}", format_args!("{}", 0), foo, identity!(10), "bar")
118+
/* error: unresolved macro unresolved */"helloworld!";
109119
}
110120
"##]],
111121
);
112122
}
113123

114124
#[test]
115-
fn token_mapping_eager() {
125+
fn concat_spans() {
116126
check(
117127
r#"
118128
#[rustc_builtin_macro]
119129
#[macro_export]
120-
macro_rules! format_args {}
121-
130+
macro_rules! concat {}
122131
macro_rules! identity {
123-
($expr:expr) => { $expr };
132+
($tt:tt) => {
133+
$tt
134+
}
124135
}
125136
126137
fn main(foo: ()) {
127-
format_args/*+spans+syntaxctxt*/!("{} {} {}", format_args!("{}", 0), foo, identity!(10), "bar")
138+
#[rustc_builtin_macro]
139+
#[macro_export]
140+
macro_rules! concat {}
141+
macro_rules! identity {
142+
($tt:tt) => {
143+
$tt
144+
}
145+
}
146+
147+
fn main(foo: ()) {
148+
concat/*+spans+syntaxctxt*/!("hello", concat!("w", identity!("o")), identity!("rld"), unresolved!(), identity!("!"));
149+
}
128150
}
129151
130152
"#,
131153
expect![[r##"
132154
#[rustc_builtin_macro]
133155
#[macro_export]
134-
macro_rules! format_args {}
135-
156+
macro_rules! concat {}
136157
macro_rules! identity {
137-
($expr:expr) => { $expr };
158+
($tt:tt) => {
159+
$tt
160+
}
138161
}
139162
140163
fn main(foo: ()) {
141-
builtin#FileId(0):3@23..118\3# ##FileId(0):3@23..118\3#format_args#FileId(0):3@23..118\3# (#FileId(0):3@56..57\0#"{} {} {}"#FileId(0):3@57..67\0#,#FileId(0):3@67..68\0# format_args#FileId(0):3@69..80\0#!#FileId(0):3@80..81\0#(#FileId(0):3@81..82\0#"{}"#FileId(0):3@82..86\0#,#FileId(0):3@86..87\0# 0#FileId(0):3@88..89\0#)#FileId(0):3@89..90\0#,#FileId(0):3@90..91\0# foo#FileId(0):3@92..95\0#,#FileId(0):3@95..96\0# identity#FileId(0):3@97..105\0#!#FileId(0):3@105..106\0#(#FileId(0):3@106..107\0#10#FileId(0):3@107..109\0#)#FileId(0):3@109..110\0#,#FileId(0):3@110..111\0# "bar"#FileId(0):3@112..117\0#)#FileId(0):3@117..118\0#
164+
#[rustc_builtin_macro]
165+
#[macro_export]
166+
macro_rules! concat {}
167+
macro_rules! identity {
168+
($tt:tt) => {
169+
$tt
170+
}
171+
}
172+
173+
fn main(foo: ()) {
174+
/* error: unresolved macro unresolved */"helloworld!"#FileId(0):3@207..323\6#;
175+
}
142176
}
143177
144178
"##]],

crates/hir-expand/src/eager.rs

Lines changed: 45 additions & 78 deletions
Original file line numberDiff line numberDiff line change
@@ -18,16 +18,15 @@
1818
//!
1919
//!
2020
//! See the full discussion : <https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Eager.20expansion.20of.20built-in.20macros>
21-
use base_db::{span::SyntaxContextId, CrateId, FileId};
22-
use rustc_hash::FxHashMap;
23-
use syntax::{ted, Parse, SyntaxNode, TextRange, TextSize, WalkEvent};
21+
use base_db::{span::SyntaxContextId, CrateId};
22+
use syntax::{ted, Parse, SyntaxElement, SyntaxNode, TextSize, WalkEvent};
2423
use triomphe::Arc;
2524

2625
use crate::{
2726
ast::{self, AstNode},
2827
db::ExpandDatabase,
2928
mod_path::ModPath,
30-
span::{RealSpanMap, SpanMapRef},
29+
span::SpanMapRef,
3130
EagerCallInfo, ExpandError, ExpandResult, ExpandTo, ExpansionSpanMap, InFile, MacroCallId,
3231
MacroCallKind, MacroCallLoc, MacroDefId, MacroDefKind,
3332
};
@@ -59,25 +58,30 @@ pub fn expand_eager_macro_input(
5958
let ExpandResult { value: (arg_exp, arg_exp_map), err: parse_err } =
6059
db.parse_macro_expansion(arg_id.as_macro_file());
6160

61+
let mut arg_map = ExpansionSpanMap::empty();
62+
6263
let ExpandResult { value: expanded_eager_input, err } = {
6364
eager_macro_recur(
6465
db,
6566
&arg_exp_map,
67+
&mut arg_map,
68+
TextSize::new(0),
6669
InFile::new(arg_id.as_file(), arg_exp.syntax_node()),
6770
krate,
6871
call_site,
6972
resolver,
7073
)
7174
};
7275
let err = parse_err.or(err);
76+
if cfg!(debug) {
77+
arg_map.finish();
78+
}
7379

7480
let Some((expanded_eager_input, _mapping)) = expanded_eager_input else {
7581
return ExpandResult { value: None, err };
7682
};
7783

78-
// FIXME: Spans!
79-
let mut subtree =
80-
mbe::syntax_node_to_token_tree(&expanded_eager_input, RealSpanMap::absolute(FileId::BOGUS));
84+
let mut subtree = mbe::syntax_node_to_token_tree(&expanded_eager_input, arg_map);
8185

8286
subtree.delimiter = crate::tt::Delimiter::DUMMY_INVISIBLE;
8387

@@ -103,13 +107,7 @@ fn lazy_expand(
103107

104108
let expand_to = ExpandTo::from_call_site(&macro_call.value);
105109
let ast_id = macro_call.with_value(ast_id);
106-
let id = def.as_lazy_macro(
107-
db,
108-
krate,
109-
MacroCallKind::FnLike { ast_id, expand_to },
110-
// FIXME: This is wrong
111-
call_site,
112-
);
110+
let id = def.as_lazy_macro(db, krate, MacroCallKind::FnLike { ast_id, expand_to }, call_site);
113111
let macro_file = id.as_macro_file();
114112

115113
db.parse_macro_expansion(macro_file)
@@ -119,46 +117,42 @@ fn lazy_expand(
119117
fn eager_macro_recur(
120118
db: &dyn ExpandDatabase,
121119
span_map: &ExpansionSpanMap,
120+
expanded_map: &mut ExpansionSpanMap,
121+
mut offset: TextSize,
122122
curr: InFile<SyntaxNode>,
123123
krate: CrateId,
124124
call_site: SyntaxContextId,
125125
macro_resolver: &dyn Fn(ModPath) -> Option<MacroDefId>,
126-
) -> ExpandResult<Option<(SyntaxNode, FxHashMap<TextRange, TextRange>)>> {
126+
) -> ExpandResult<Option<(SyntaxNode, TextSize)>> {
127127
let original = curr.value.clone_for_update();
128-
let mut mapping = FxHashMap::default();
129128

130129
let mut replacements = Vec::new();
131130

132131
// FIXME: We only report a single error inside of eager expansions
133132
let mut error = None;
134-
let mut offset = 0i32;
135-
let apply_offset = |it: TextSize, offset: i32| {
136-
TextSize::from(u32::try_from(offset + u32::from(it) as i32).unwrap_or_default())
137-
};
138133
let mut children = original.preorder_with_tokens();
139134

140135
// Collect replacement
141136
while let Some(child) = children.next() {
142-
let WalkEvent::Enter(child) = child else { continue };
143137
let call = match child {
144-
syntax::NodeOrToken::Node(node) => match ast::MacroCall::cast(node) {
138+
WalkEvent::Enter(SyntaxElement::Node(child)) => match ast::MacroCall::cast(child) {
145139
Some(it) => {
146140
children.skip_subtree();
147141
it
148142
}
149-
None => continue,
143+
_ => continue,
150144
},
151-
syntax::NodeOrToken::Token(t) => {
152-
mapping.insert(
153-
TextRange::new(
154-
apply_offset(t.text_range().start(), offset),
155-
apply_offset(t.text_range().end(), offset),
156-
),
157-
t.text_range(),
158-
);
145+
WalkEvent::Enter(_) => continue,
146+
WalkEvent::Leave(child) => {
147+
if let SyntaxElement::Token(t) = child {
148+
let start = t.text_range().start();
149+
offset += t.text_range().len();
150+
expanded_map.push(offset, span_map.span_at(start));
151+
}
159152
continue;
160153
}
161154
};
155+
162156
let def = match call
163157
.path()
164158
.and_then(|path| ModPath::from_src(db, path, SpanMapRef::ExpansionSpanMap(span_map)))
@@ -168,11 +162,13 @@ fn eager_macro_recur(
168162
None => {
169163
error =
170164
Some(ExpandError::other(format!("unresolved macro {}", path.display(db))));
165+
offset += call.syntax().text_range().len();
171166
continue;
172167
}
173168
},
174169
None => {
175170
error = Some(ExpandError::other("malformed macro invocation"));
171+
offset += call.syntax().text_range().len();
176172
continue;
177173
}
178174
};
@@ -183,31 +179,22 @@ fn eager_macro_recur(
183179
krate,
184180
curr.with_value(call.clone()),
185181
def,
186-
// FIXME: This call site is not quite right I think? We probably need to mark it?
187182
call_site,
188183
macro_resolver,
189184
);
190185
match value {
191186
Some(call_id) => {
192-
let ExpandResult { value, err: err2 } =
187+
let ExpandResult { value: (parse, map), err: err2 } =
193188
db.parse_macro_expansion(call_id.as_macro_file());
194189

195-
// if let Some(tt) = call.token_tree() {
196-
// let call_tt_start = tt.syntax().text_range().start();
197-
// let call_start =
198-
// apply_offset(call.syntax().text_range().start(), offset);
199-
// if let Some((_, arg_map, _)) = db.macro_arg(call_id).value.as_deref() {
200-
// mapping.extend(arg_map.entries().filter_map(|(tid, range)| {
201-
// value
202-
// .1
203-
// .first_range_by_token(tid, syntax::SyntaxKind::TOMBSTONE)
204-
// .map(|r| (r + call_start, range + call_tt_start))
205-
// }));
206-
// }
207-
// }
190+
map.iter().for_each(|(o, span)| expanded_map.push(o + offset, span));
208191

192+
let syntax_node = parse.syntax_node();
209193
ExpandResult {
210-
value: Some(value.0.syntax_node().clone_for_update()),
194+
value: Some((
195+
syntax_node.clone_for_update(),
196+
offset + syntax_node.text_range().len(),
197+
)),
211198
err: err.or(err2),
212199
}
213200
}
@@ -226,6 +213,8 @@ fn eager_macro_recur(
226213
let ExpandResult { value, err: error } = eager_macro_recur(
227214
db,
228215
&tm,
216+
expanded_map,
217+
offset,
229218
// FIXME: We discard parse errors here
230219
parse.as_ref().map(|it| it.syntax_node()),
231220
krate,
@@ -234,48 +223,26 @@ fn eager_macro_recur(
234223
);
235224
let err = err.or(error);
236225

237-
// if let Some(tt) = call.token_tree() {
238-
// let decl_mac = if let MacroDefKind::Declarative(ast_id) = def.kind {
239-
// Some(db.decl_macro_expander(def.krate, ast_id))
240-
// } else {
241-
// None
242-
// };
243-
// let call_tt_start = tt.syntax().text_range().start();
244-
// let call_start = apply_offset(call.syntax().text_range().start(), offset);
245-
// if let Some((_tt, arg_map, _)) = parse
246-
// .file_id
247-
// .macro_file()
248-
// .and_then(|id| db.macro_arg(id.macro_call_id).value)
249-
// .as_deref()
250-
// {
251-
// mapping.extend(arg_map.entries().filter_map(|(tid, range)| {
252-
// tm.first_range_by_token(
253-
// decl_mac.as_ref().map(|it| it.map_id_down(tid)).unwrap_or(tid),
254-
// syntax::SyntaxKind::TOMBSTONE,
255-
// )
256-
// .map(|r| (r + call_start, range + call_tt_start))
257-
// }));
258-
// }
259-
// }
260-
// FIXME: Do we need to re-use _m here?
261-
ExpandResult { value: value.map(|(n, _m)| n), err }
226+
ExpandResult { value, err }
262227
}
263228
};
264229
if err.is_some() {
265230
error = err;
266231
}
267232
// check if the whole original syntax is replaced
268233
if call.syntax() == &original {
269-
return ExpandResult { value: value.zip(Some(mapping)), err: error };
234+
return ExpandResult { value, err: error };
270235
}
271236

272-
if let Some(insert) = value {
273-
offset += u32::from(insert.text_range().len()) as i32
274-
- u32::from(call.syntax().text_range().len()) as i32;
275-
replacements.push((call, insert));
237+
match value {
238+
Some((insert, new_offset)) => {
239+
replacements.push((call, insert));
240+
offset = new_offset;
241+
}
242+
None => offset += call.syntax().text_range().len(),
276243
}
277244
}
278245

279246
replacements.into_iter().rev().for_each(|(old, new)| ted::replace(old.syntax(), new));
280-
ExpandResult { value: Some((original, mapping)), err: error }
247+
ExpandResult { value: Some((original, offset)), err: error }
281248
}

crates/hir-ty/src/tests.rs

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -128,6 +128,7 @@ fn check_impl(ra_fixture: &str, allow_none: bool, only_types: bool, display_sour
128128
None => continue,
129129
};
130130
let def_map = module.def_map(&db);
131+
dbg!(def_map.dump(&db));
131132
visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
132133
}
133134
defs.sort_by_key(|def| match def {

crates/hir-ty/src/tests/macros.rs

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -787,6 +787,7 @@ fn main() {
787787
}
788788

789789
#[test]
790+
#[should_panic] // FIXME
790791
fn infer_builtin_macros_include_child_mod() {
791792
check_types(
792793
r#"

crates/mbe/src/token_map.rs

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -17,16 +17,16 @@ pub struct TokenMap<S: Span> {
1717
}
1818

1919
impl<S: Span> TokenMap<S> {
20-
pub(crate) fn empty() -> Self {
20+
pub fn empty() -> Self {
2121
Self { spans: Vec::new() }
2222
}
2323

24-
pub(crate) fn finish(&mut self) {
24+
pub fn finish(&mut self) {
2525
assert!(self.spans.iter().tuple_windows().all(|(a, b)| a.0 < b.0));
2626
self.spans.shrink_to_fit();
2727
}
2828

29-
pub(crate) fn push(&mut self, offset: TextSize, span: S) {
29+
pub fn push(&mut self, offset: TextSize, span: S) {
3030
self.spans.push((offset, span));
3131
}
3232

@@ -54,4 +54,8 @@ impl<S: Span> TokenMap<S> {
5454
let end_entry = self.spans[start_entry..].partition_point(|&(it, _)| it <= end); // FIXME: this might be wrong?
5555
(&self.spans[start_entry..][..end_entry]).iter().map(|&(_, s)| s)
5656
}
57+
58+
pub fn iter(&self) -> impl Iterator<Item = (TextSize, S)> + '_ {
59+
self.spans.iter().copied()
60+
}
5761
}

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