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authorJonas Schievink <[email protected]>2020-11-26 15:48:17 +0000
committerJonas Schievink <[email protected]>2020-11-26 15:48:17 +0000
commit6a9338e979ed90d2c0342db2d489c37bebb62ce7 (patch)
tree260c5811fb59578cf44ff0929c4aab8b4f1773ce /crates/hir_expand/src
parent1542797284f5d3ea51d4e44c5c3c0c673d22d79a (diff)
Use `ExpandResult` instead of `MacroResult`
`MacroResult` is redundant
Diffstat (limited to 'crates/hir_expand/src')
-rw-r--r--crates/hir_expand/src/db.rs80
-rw-r--r--crates/hir_expand/src/lib.rs2
2 files changed, 30 insertions, 52 deletions
diff --git a/crates/hir_expand/src/db.rs b/crates/hir_expand/src/db.rs
index 3deac1711..46ebdbc74 100644
--- a/crates/hir_expand/src/db.rs
+++ b/crates/hir_expand/src/db.rs
@@ -13,19 +13,6 @@ use crate::{
13 MacroFile, ProcMacroExpander, 13 MacroFile, ProcMacroExpander,
14}; 14};
15 15
16/// A result of some macro expansion.
17#[derive(Debug, Clone, Eq, PartialEq)]
18pub struct MacroResult<T> {
19 /// The result of the expansion. Might be `None` when error recovery was impossible and no
20 /// usable result was produced.
21 pub value: Option<T>,
22
23 /// The error that occurred during expansion or processing.
24 ///
25 /// Since we do error recovery, getting an error here does not mean that `value` will be absent.
26 pub error: Option<String>,
27}
28
29#[derive(Debug, Clone, Eq, PartialEq)] 16#[derive(Debug, Clone, Eq, PartialEq)]
30pub enum TokenExpander { 17pub enum TokenExpander {
31 MacroRules(mbe::MacroRules), 18 MacroRules(mbe::MacroRules),
@@ -91,8 +78,8 @@ pub trait AstDatabase: SourceDatabase {
91 fn parse_macro_expansion( 78 fn parse_macro_expansion(
92 &self, 79 &self,
93 macro_file: MacroFile, 80 macro_file: MacroFile,
94 ) -> MacroResult<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>; 81 ) -> ExpandResult<Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>>;
95 fn macro_expand(&self, macro_call: MacroCallId) -> MacroResult<Arc<tt::Subtree>>; 82 fn macro_expand(&self, macro_call: MacroCallId) -> ExpandResult<Option<Arc<tt::Subtree>>>;
96 83
97 #[salsa::interned] 84 #[salsa::interned]
98 fn intern_eager_expansion(&self, eager: EagerCallLoc) -> EagerMacroId; 85 fn intern_eager_expansion(&self, eager: EagerCallLoc) -> EagerMacroId;
@@ -100,20 +87,6 @@ pub trait AstDatabase: SourceDatabase {
100 fn expand_proc_macro(&self, call: MacroCallId) -> Result<tt::Subtree, mbe::ExpandError>; 87 fn expand_proc_macro(&self, call: MacroCallId) -> Result<tt::Subtree, mbe::ExpandError>;
101} 88}
102 89
103impl<T> MacroResult<T> {
104 fn error(message: String) -> Self {
105 Self { value: None, error: Some(message) }
106 }
107
108 fn map<U>(self, f: impl FnOnce(T) -> U) -> MacroResult<U> {
109 MacroResult { value: self.value.map(f), error: self.error }
110 }
111
112 fn drop_value<U>(self) -> MacroResult<U> {
113 MacroResult { value: None, error: self.error }
114 }
115}
116
117/// This expands the given macro call, but with different arguments. This is 90/// This expands the given macro call, but with different arguments. This is
118/// used for completion, where we want to see what 'would happen' if we insert a 91/// used for completion, where we want to see what 'would happen' if we insert a
119/// token. The `token_to_map` mapped down into the expansion, with the mapped 92/// token. The `token_to_map` mapped down into the expansion, with the mapped
@@ -194,7 +167,7 @@ fn macro_arg(db: &dyn AstDatabase, id: MacroCallId) -> Option<Arc<(tt::Subtree,
194 Some(Arc::new((tt, tmap))) 167 Some(Arc::new((tt, tmap)))
195} 168}
196 169
197fn macro_expand(db: &dyn AstDatabase, id: MacroCallId) -> MacroResult<Arc<tt::Subtree>> { 170fn macro_expand(db: &dyn AstDatabase, id: MacroCallId) -> ExpandResult<Option<Arc<tt::Subtree>>> {
198 macro_expand_with_arg(db, id, None) 171 macro_expand_with_arg(db, id, None)
199} 172}
200 173
@@ -215,18 +188,18 @@ fn macro_expand_with_arg(
215 db: &dyn AstDatabase, 188 db: &dyn AstDatabase,
216 id: MacroCallId, 189 id: MacroCallId,
217 arg: Option<Arc<(tt::Subtree, mbe::TokenMap)>>, 190 arg: Option<Arc<(tt::Subtree, mbe::TokenMap)>>,
218) -> MacroResult<Arc<tt::Subtree>> { 191) -> ExpandResult<Option<Arc<tt::Subtree>>> {
219 let lazy_id = match id { 192 let lazy_id = match id {
220 MacroCallId::LazyMacro(id) => id, 193 MacroCallId::LazyMacro(id) => id,
221 MacroCallId::EagerMacro(id) => { 194 MacroCallId::EagerMacro(id) => {
222 if arg.is_some() { 195 if arg.is_some() {
223 return MacroResult::error( 196 return ExpandResult::str_err(
224 "hypothetical macro expansion not implemented for eager macro".to_owned(), 197 "hypothetical macro expansion not implemented for eager macro".to_owned(),
225 ); 198 );
226 } else { 199 } else {
227 return MacroResult { 200 return ExpandResult {
228 value: Some(db.lookup_intern_eager_expansion(id).subtree), 201 value: Some(db.lookup_intern_eager_expansion(id).subtree),
229 error: None, 202 err: None,
230 }; 203 };
231 } 204 }
232 } 205 }
@@ -235,21 +208,24 @@ fn macro_expand_with_arg(
235 let loc = db.lookup_intern_macro(lazy_id); 208 let loc = db.lookup_intern_macro(lazy_id);
236 let macro_arg = match arg.or_else(|| db.macro_arg(id)) { 209 let macro_arg = match arg.or_else(|| db.macro_arg(id)) {
237 Some(it) => it, 210 Some(it) => it,
238 None => return MacroResult::error("Fail to args in to tt::TokenTree".into()), 211 None => return ExpandResult::str_err("Fail to args in to tt::TokenTree".into()),
239 }; 212 };
240 213
241 let macro_rules = match db.macro_def(loc.def) { 214 let macro_rules = match db.macro_def(loc.def) {
242 Some(it) => it, 215 Some(it) => it,
243 None => return MacroResult::error("Fail to find macro definition".into()), 216 None => return ExpandResult::str_err("Fail to find macro definition".into()),
244 }; 217 };
245 let ExpandResult { value: tt, err } = macro_rules.0.expand(db, lazy_id, &macro_arg.0); 218 let ExpandResult { value: tt, err } = macro_rules.0.expand(db, lazy_id, &macro_arg.0);
246 // Set a hard limit for the expanded tt 219 // Set a hard limit for the expanded tt
247 let count = tt.count(); 220 let count = tt.count();
248 if count > 262144 { 221 if count > 262144 {
249 return MacroResult::error(format!("Total tokens count exceed limit : count = {}", count)); 222 return ExpandResult::str_err(format!(
223 "Total tokens count exceed limit : count = {}",
224 count
225 ));
250 } 226 }
251 227
252 MacroResult { value: Some(Arc::new(tt)), error: err.map(|e| format!("{:?}", e)) } 228 ExpandResult { value: Some(Arc::new(tt)), err }
253} 229}
254 230
255fn expand_proc_macro( 231fn expand_proc_macro(
@@ -283,7 +259,7 @@ fn parse_or_expand(db: &dyn AstDatabase, file_id: HirFileId) -> Option<SyntaxNod
283 match file_id.0 { 259 match file_id.0 {
284 HirFileIdRepr::FileId(file_id) => Some(db.parse(file_id).tree().syntax().clone()), 260 HirFileIdRepr::FileId(file_id) => Some(db.parse(file_id).tree().syntax().clone()),
285 HirFileIdRepr::MacroFile(macro_file) => { 261 HirFileIdRepr::MacroFile(macro_file) => {
286 db.parse_macro_expansion(macro_file).map(|(it, _)| it.syntax_node()).value 262 db.parse_macro_expansion(macro_file).value.map(|(it, _)| it.syntax_node())
287 } 263 }
288 } 264 }
289} 265}
@@ -291,7 +267,7 @@ fn parse_or_expand(db: &dyn AstDatabase, file_id: HirFileId) -> Option<SyntaxNod
291fn parse_macro_expansion( 267fn parse_macro_expansion(
292 db: &dyn AstDatabase, 268 db: &dyn AstDatabase,
293 macro_file: MacroFile, 269 macro_file: MacroFile,
294) -> MacroResult<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)> { 270) -> ExpandResult<Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>> {
295 parse_macro_with_arg(db, macro_file, None) 271 parse_macro_with_arg(db, macro_file, None)
296} 272}
297 273
@@ -299,7 +275,7 @@ fn parse_macro_with_arg(
299 db: &dyn AstDatabase, 275 db: &dyn AstDatabase,
300 macro_file: MacroFile, 276 macro_file: MacroFile,
301 arg: Option<Arc<(tt::Subtree, mbe::TokenMap)>>, 277 arg: Option<Arc<(tt::Subtree, mbe::TokenMap)>>,
302) -> MacroResult<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)> { 278) -> ExpandResult<Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>> {
303 let _p = profile::span("parse_macro_query"); 279 let _p = profile::span("parse_macro_query");
304 280
305 let macro_call_id = macro_file.macro_call_id; 281 let macro_call_id = macro_file.macro_call_id;
@@ -308,7 +284,7 @@ fn parse_macro_with_arg(
308 } else { 284 } else {
309 db.macro_expand(macro_call_id) 285 db.macro_expand(macro_call_id)
310 }; 286 };
311 if let Some(err) = &result.error { 287 if let Some(err) = &result.err {
312 // Note: 288 // Note:
313 // The final goal we would like to make all parse_macro success, 289 // The final goal we would like to make all parse_macro success,
314 // such that the following log will not call anyway. 290 // such that the following log will not call anyway.
@@ -326,20 +302,20 @@ fn parse_macro_with_arg(
326 .join("\n"); 302 .join("\n");
327 303
328 log::warn!( 304 log::warn!(
329 "fail on macro_parse: (reason: {} macro_call: {:#}) parents: {}", 305 "fail on macro_parse: (reason: {:?} macro_call: {:#}) parents: {}",
330 err, 306 err,
331 node.value, 307 node.value,
332 parents 308 parents
333 ); 309 );
334 } 310 }
335 _ => { 311 _ => {
336 log::warn!("fail on macro_parse: (reason: {})", err); 312 log::warn!("fail on macro_parse: (reason: {:?})", err);
337 } 313 }
338 } 314 }
339 } 315 }
340 let tt = match result.value { 316 let tt = match result.value {
341 Some(tt) => tt, 317 Some(tt) => tt,
342 None => return result.drop_value(), 318 None => return ExpandResult { value: None, err: result.err },
343 }; 319 };
344 320
345 let fragment_kind = to_fragment_kind(db, macro_call_id); 321 let fragment_kind = to_fragment_kind(db, macro_call_id);
@@ -347,29 +323,29 @@ fn parse_macro_with_arg(
347 let (parse, rev_token_map) = match mbe::token_tree_to_syntax_node(&tt, fragment_kind) { 323 let (parse, rev_token_map) = match mbe::token_tree_to_syntax_node(&tt, fragment_kind) {
348 Ok(it) => it, 324 Ok(it) => it,
349 Err(err) => { 325 Err(err) => {
350 return MacroResult::error(format!("{:?}", err)); 326 return ExpandResult::only_err(err);
351 } 327 }
352 }; 328 };
353 329
354 match result.error { 330 match result.err {
355 Some(error) => { 331 Some(err) => {
356 // Safety check for recursive identity macro. 332 // Safety check for recursive identity macro.
357 let node = parse.syntax_node(); 333 let node = parse.syntax_node();
358 let file: HirFileId = macro_file.into(); 334 let file: HirFileId = macro_file.into();
359 let call_node = match file.call_node(db) { 335 let call_node = match file.call_node(db) {
360 Some(it) => it, 336 Some(it) => it,
361 None => { 337 None => {
362 return MacroResult::error(error); 338 return ExpandResult::only_err(err);
363 } 339 }
364 }; 340 };
365 341
366 if !diff(&node, &call_node.value).is_empty() { 342 if !diff(&node, &call_node.value).is_empty() {
367 MacroResult { value: Some((parse, Arc::new(rev_token_map))), error: Some(error) } 343 ExpandResult { value: Some((parse, Arc::new(rev_token_map))), err: Some(err) }
368 } else { 344 } else {
369 return MacroResult::error(error); 345 return ExpandResult::only_err(err);
370 } 346 }
371 } 347 }
372 None => MacroResult { value: Some((parse, Arc::new(rev_token_map))), error: None }, 348 None => ExpandResult { value: Some((parse, Arc::new(rev_token_map))), err: None },
373 } 349 }
374} 350}
375 351
diff --git a/crates/hir_expand/src/lib.rs b/crates/hir_expand/src/lib.rs
index 83e09738b..d5ba691b7 100644
--- a/crates/hir_expand/src/lib.rs
+++ b/crates/hir_expand/src/lib.rs
@@ -15,6 +15,8 @@ pub mod proc_macro;
15pub mod quote; 15pub mod quote;
16pub mod eager; 16pub mod eager;
17 17
18pub use mbe::{ExpandError, ExpandResult};
19
18use std::hash::Hash; 20use std::hash::Hash;
19use std::sync::Arc; 21use std::sync::Arc;
20 22