1 //! Transforms `ast::Expr` into an equivalent `hir_def::expr::Expr`
9 name::{name, AsName, Name},
10 ExpandError, HirFileId,
16 self, ArgListOwner, ArrayExprKind, AstChildren, LiteralKind, LoopBodyOwner, NameOwner,
19 AstNode, AstPtr, SyntaxNodePtr,
24 body::{Body, BodySourceMap, Expander, LabelSource, PatPtr, SyntheticSyntax},
25 builtin_type::{BuiltinFloat, BuiltinInt, BuiltinUint},
27 diagnostics::{InactiveCode, MacroError, UnresolvedMacroCall, UnresolvedProcMacro},
29 dummy_expr_id, ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Label,
30 LabelId, Literal, LogicOp, MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField,
34 item_scope::BuiltinShadowMode,
35 path::{GenericArgs, Path},
36 type_ref::{Mutability, Rawness, TypeRef},
37 AdtId, BlockLoc, ModuleDefId, UnresolvedMacro,
40 use super::{diagnostics::BodyDiagnostic, ExprSource, PatSource};
42 pub(crate) struct LowerCtx {
47 pub(crate) fn new(db: &dyn DefDatabase, file_id: HirFileId) -> Self {
48 LowerCtx { hygiene: Hygiene::new(db.upcast(), file_id) }
50 pub(crate) fn with_hygiene(hygiene: &Hygiene) -> Self {
51 LowerCtx { hygiene: hygiene.clone() }
54 pub(crate) fn lower_path(&self, ast: ast::Path) -> Option<Path> {
55 Path::from_src(ast, &self.hygiene)
62 params: Option<ast::ParamList>,
63 body: Option<ast::Expr>,
64 ) -> (Body, BodySourceMap) {
67 source_map: BodySourceMap::default(),
69 exprs: Arena::default(),
70 pats: Arena::default(),
71 labels: Arena::default(),
73 body_expr: dummy_expr_id(),
74 block_scopes: Vec::new(),
78 statements_in_scope: Vec::new(),
80 .collect(params, body)
83 struct ExprCollector<'a> {
84 db: &'a dyn DefDatabase,
87 source_map: BodySourceMap,
88 statements_in_scope: Vec<Statement>,
91 impl ExprCollector<'_> {
94 param_list: Option<ast::ParamList>,
95 body: Option<ast::Expr>,
96 ) -> (Body, BodySourceMap) {
97 if let Some(param_list) = param_list {
98 if let Some(self_param) = param_list.self_param() {
99 let ptr = AstPtr::new(&self_param);
100 let param_pat = self.alloc_pat(
103 mode: BindingAnnotation::new(
104 self_param.mut_token().is_some() && self_param.amp_token().is_none(),
111 self.body.params.push(param_pat);
114 for param in param_list.params() {
115 let pat = match param.pat() {
119 let param_pat = self.collect_pat(pat);
120 self.body.params.push(param_pat);
124 self.body.body_expr = self.collect_expr_opt(body);
125 (self.body, self.source_map)
128 fn ctx(&self) -> LowerCtx {
129 LowerCtx::new(self.db, self.expander.current_file_id)
132 fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
133 let src = self.expander.to_source(ptr);
134 let id = self.make_expr(expr, Ok(src.clone()));
135 self.source_map.expr_map.insert(src, id);
138 // desugared exprs don't have ptr, that's wrong and should be fixed
140 fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId {
141 self.make_expr(expr, Err(SyntheticSyntax))
143 fn unit(&mut self) -> ExprId {
144 self.alloc_expr_desugared(Expr::Tuple { exprs: Vec::new() })
146 fn missing_expr(&mut self) -> ExprId {
147 self.alloc_expr_desugared(Expr::Missing)
149 fn make_expr(&mut self, expr: Expr, src: Result<ExprSource, SyntheticSyntax>) -> ExprId {
150 let id = self.body.exprs.alloc(expr);
151 self.source_map.expr_map_back.insert(id, src);
155 fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId {
156 let src = self.expander.to_source(ptr);
157 let id = self.make_pat(pat, Ok(src.clone()));
158 self.source_map.pat_map.insert(src, id);
161 fn missing_pat(&mut self) -> PatId {
162 self.make_pat(Pat::Missing, Err(SyntheticSyntax))
164 fn make_pat(&mut self, pat: Pat, src: Result<PatSource, SyntheticSyntax>) -> PatId {
165 let id = self.body.pats.alloc(pat);
166 self.source_map.pat_map_back.insert(id, src);
170 fn alloc_label(&mut self, label: Label, ptr: AstPtr<ast::Label>) -> LabelId {
171 let src = self.expander.to_source(ptr);
172 let id = self.make_label(label, src.clone());
173 self.source_map.label_map.insert(src, id);
176 fn make_label(&mut self, label: Label, src: LabelSource) -> LabelId {
177 let id = self.body.labels.alloc(label);
178 self.source_map.label_map_back.insert(id, src);
182 fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
183 self.maybe_collect_expr(expr).unwrap_or_else(|| self.missing_expr())
186 /// Returns `None` if the expression is `#[cfg]`d out.
187 fn maybe_collect_expr(&mut self, expr: ast::Expr) -> Option<ExprId> {
188 let syntax_ptr = AstPtr::new(&expr);
189 self.check_cfg(&expr)?;
192 ast::Expr::IfExpr(e) => {
193 let then_branch = self.collect_block_opt(e.then_branch());
195 let else_branch = e.else_branch().map(|b| match b {
196 ast::ElseBranch::Block(it) => self.collect_block(it),
197 ast::ElseBranch::IfExpr(elif) => {
198 let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap();
199 self.collect_expr(expr)
203 let condition = match e.condition() {
204 None => self.missing_expr(),
205 Some(condition) => match condition.pat() {
206 None => self.collect_expr_opt(condition.expr()),
207 // if let -- desugar to match
209 let pat = self.collect_pat(pat);
210 let match_expr = self.collect_expr_opt(condition.expr());
211 let placeholder_pat = self.missing_pat();
213 MatchArm { pat, expr: then_branch, guard: None },
215 pat: placeholder_pat,
216 expr: else_branch.unwrap_or_else(|| self.unit()),
221 self.alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr),
227 self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
229 ast::Expr::EffectExpr(e) => match e.effect() {
230 ast::Effect::Try(_) => {
231 let body = self.collect_block_opt(e.block_expr());
232 self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
234 ast::Effect::Unsafe(_) => {
235 let body = self.collect_block_opt(e.block_expr());
236 self.alloc_expr(Expr::Unsafe { body }, syntax_ptr)
238 // FIXME: we need to record these effects somewhere...
239 ast::Effect::Label(label) => {
240 let label = self.collect_label(label);
241 match e.block_expr() {
243 let res = self.collect_block(block);
244 match &mut self.body.exprs[res] {
245 Expr::Block { label: block_label, .. } => {
246 *block_label = Some(label);
252 None => self.missing_expr(),
255 // FIXME: we need to record these effects somewhere...
256 ast::Effect::Async(_) => {
257 let body = self.collect_block_opt(e.block_expr());
258 self.alloc_expr(Expr::Async { body }, syntax_ptr)
260 ast::Effect::Const(_) => {
261 let body = self.collect_block_opt(e.block_expr());
262 self.alloc_expr(Expr::Const { body }, syntax_ptr)
265 ast::Expr::BlockExpr(e) => self.collect_block(e),
266 ast::Expr::LoopExpr(e) => {
267 let label = e.label().map(|label| self.collect_label(label));
268 let body = self.collect_block_opt(e.loop_body());
269 self.alloc_expr(Expr::Loop { body, label }, syntax_ptr)
271 ast::Expr::WhileExpr(e) => {
272 let label = e.label().map(|label| self.collect_label(label));
273 let body = self.collect_block_opt(e.loop_body());
275 let condition = match e.condition() {
276 None => self.missing_expr(),
277 Some(condition) => match condition.pat() {
278 None => self.collect_expr_opt(condition.expr()),
279 // if let -- desugar to match
281 cov_mark::hit!(infer_resolve_while_let);
282 let pat = self.collect_pat(pat);
283 let match_expr = self.collect_expr_opt(condition.expr());
284 let placeholder_pat = self.missing_pat();
286 self.alloc_expr_desugared(Expr::Break { expr: None, label: None });
288 MatchArm { pat, expr: body, guard: None },
289 MatchArm { pat: placeholder_pat, expr: break_, guard: None },
292 self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms });
294 self.alloc_expr(Expr::Loop { body: match_expr, label }, syntax_ptr),
300 self.alloc_expr(Expr::While { condition, body, label }, syntax_ptr)
302 ast::Expr::ForExpr(e) => {
303 let label = e.label().map(|label| self.collect_label(label));
304 let iterable = self.collect_expr_opt(e.iterable());
305 let pat = self.collect_pat_opt(e.pat());
306 let body = self.collect_block_opt(e.loop_body());
307 self.alloc_expr(Expr::For { iterable, pat, body, label }, syntax_ptr)
309 ast::Expr::CallExpr(e) => {
310 let callee = self.collect_expr_opt(e.expr());
311 let args = if let Some(arg_list) = e.arg_list() {
312 arg_list.args().filter_map(|e| self.maybe_collect_expr(e)).collect()
316 self.alloc_expr(Expr::Call { callee, args }, syntax_ptr)
318 ast::Expr::MethodCallExpr(e) => {
319 let receiver = self.collect_expr_opt(e.receiver());
320 let args = if let Some(arg_list) = e.arg_list() {
321 arg_list.args().filter_map(|e| self.maybe_collect_expr(e)).collect()
325 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
328 .and_then(|it| GenericArgs::from_ast(&self.ctx(), it))
331 Expr::MethodCall { receiver, method_name, args, generic_args },
335 ast::Expr::MatchExpr(e) => {
336 let expr = self.collect_expr_opt(e.expr());
337 let arms = if let Some(match_arm_list) = e.match_arm_list() {
341 self.check_cfg(&arm).map(|()| MatchArm {
342 pat: self.collect_pat_opt(arm.pat()),
343 expr: self.collect_expr_opt(arm.expr()),
346 .and_then(|guard| guard.expr())
347 .map(|e| self.collect_expr(e)),
354 self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr)
356 ast::Expr::PathExpr(e) => {
359 .and_then(|path| self.expander.parse_path(path))
361 .unwrap_or(Expr::Missing);
362 self.alloc_expr(path, syntax_ptr)
364 ast::Expr::ContinueExpr(e) => self.alloc_expr(
365 Expr::Continue { label: e.lifetime().map(|l| Name::new_lifetime(&l)) },
368 ast::Expr::BreakExpr(e) => {
369 let expr = e.expr().map(|e| self.collect_expr(e));
371 Expr::Break { expr, label: e.lifetime().map(|l| Name::new_lifetime(&l)) },
375 ast::Expr::ParenExpr(e) => {
376 let inner = self.collect_expr_opt(e.expr());
377 // make the paren expr point to the inner expression as well
378 let src = self.expander.to_source(syntax_ptr);
379 self.source_map.expr_map.insert(src, inner);
382 ast::Expr::ReturnExpr(e) => {
383 let expr = e.expr().map(|e| self.collect_expr(e));
384 self.alloc_expr(Expr::Return { expr }, syntax_ptr)
386 ast::Expr::YieldExpr(e) => {
387 let expr = e.expr().map(|e| self.collect_expr(e));
388 self.alloc_expr(Expr::Yield { expr }, syntax_ptr)
390 ast::Expr::RecordExpr(e) => {
391 let path = e.path().and_then(|path| self.expander.parse_path(path)).map(Box::new);
392 let record_lit = if let Some(nfl) = e.record_expr_field_list() {
395 .filter_map(|field| {
396 self.check_cfg(&field)?;
398 let name = field.field_name()?.as_name();
400 let expr = match field.expr() {
401 Some(e) => self.collect_expr(e),
402 None => self.missing_expr(),
404 let src = self.expander.to_source(AstPtr::new(&field));
405 self.source_map.field_map.insert(src.clone(), expr);
406 self.source_map.field_map_back.insert(expr, src);
407 Some(RecordLitField { name, expr })
410 let spread = nfl.spread().map(|s| self.collect_expr(s));
411 Expr::RecordLit { path, fields, spread }
413 Expr::RecordLit { path, fields: Vec::new(), spread: None }
416 self.alloc_expr(record_lit, syntax_ptr)
418 ast::Expr::FieldExpr(e) => {
419 let expr = self.collect_expr_opt(e.expr());
420 let name = match e.field_access() {
421 Some(kind) => kind.as_name(),
422 _ => Name::missing(),
424 self.alloc_expr(Expr::Field { expr, name }, syntax_ptr)
426 ast::Expr::AwaitExpr(e) => {
427 let expr = self.collect_expr_opt(e.expr());
428 self.alloc_expr(Expr::Await { expr }, syntax_ptr)
430 ast::Expr::TryExpr(e) => {
431 let expr = self.collect_expr_opt(e.expr());
432 self.alloc_expr(Expr::Try { expr }, syntax_ptr)
434 ast::Expr::CastExpr(e) => {
435 let expr = self.collect_expr_opt(e.expr());
436 let type_ref = Interned::new(TypeRef::from_ast_opt(&self.ctx(), e.ty()));
437 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
439 ast::Expr::RefExpr(e) => {
440 let expr = self.collect_expr_opt(e.expr());
441 let raw_tok = e.raw_token().is_some();
442 let mutability = if raw_tok {
443 if e.mut_token().is_some() {
445 } else if e.const_token().is_some() {
448 unreachable!("parser only remaps to raw_token() if matching mutability token follows")
451 Mutability::from_mutable(e.mut_token().is_some())
453 let rawness = Rawness::from_raw(raw_tok);
454 self.alloc_expr(Expr::Ref { expr, rawness, mutability }, syntax_ptr)
456 ast::Expr::PrefixExpr(e) => {
457 let expr = self.collect_expr_opt(e.expr());
458 if let Some(op) = e.op_kind() {
459 self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
461 self.alloc_expr(Expr::Missing, syntax_ptr)
464 ast::Expr::ClosureExpr(e) => {
465 let mut args = Vec::new();
466 let mut arg_types = Vec::new();
467 if let Some(pl) = e.param_list() {
468 for param in pl.params() {
469 let pat = self.collect_pat_opt(param.pat());
471 param.ty().map(|it| Interned::new(TypeRef::from_ast(&self.ctx(), it)));
473 arg_types.push(type_ref);
478 .and_then(|r| r.ty())
479 .map(|it| Interned::new(TypeRef::from_ast(&self.ctx(), it)));
480 let body = self.collect_expr_opt(e.body());
481 self.alloc_expr(Expr::Lambda { args, arg_types, ret_type, body }, syntax_ptr)
483 ast::Expr::BinExpr(e) => {
484 let lhs = self.collect_expr_opt(e.lhs());
485 let rhs = self.collect_expr_opt(e.rhs());
486 let op = e.op_kind().map(BinaryOp::from);
487 self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr)
489 ast::Expr::TupleExpr(e) => {
490 let exprs = e.fields().map(|expr| self.collect_expr(expr)).collect();
491 self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr)
493 ast::Expr::BoxExpr(e) => {
494 let expr = self.collect_expr_opt(e.expr());
495 self.alloc_expr(Expr::Box { expr }, syntax_ptr)
498 ast::Expr::ArrayExpr(e) => {
502 ArrayExprKind::ElementList(e) => {
503 let exprs = e.map(|expr| self.collect_expr(expr)).collect();
504 self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr)
506 ArrayExprKind::Repeat { initializer, repeat } => {
507 let initializer = self.collect_expr_opt(initializer);
508 let repeat = self.collect_expr_opt(repeat);
510 Expr::Array(Array::Repeat { initializer, repeat }),
517 ast::Expr::Literal(e) => self.alloc_expr(Expr::Literal(e.kind().into()), syntax_ptr),
518 ast::Expr::IndexExpr(e) => {
519 let base = self.collect_expr_opt(e.base());
520 let index = self.collect_expr_opt(e.index());
521 self.alloc_expr(Expr::Index { base, index }, syntax_ptr)
523 ast::Expr::RangeExpr(e) => {
524 let lhs = e.start().map(|lhs| self.collect_expr(lhs));
525 let rhs = e.end().map(|rhs| self.collect_expr(rhs));
527 Some(range_type) => {
528 self.alloc_expr(Expr::Range { lhs, rhs, range_type }, syntax_ptr)
530 None => self.alloc_expr(Expr::Missing, syntax_ptr),
533 ast::Expr::MacroCall(e) => {
534 let mut ids = vec![];
535 self.collect_macro_call(e, syntax_ptr.clone(), true, |this, expansion| {
536 ids.push(match expansion {
537 Some(it) => this.collect_expr(it),
538 None => this.alloc_expr(Expr::Missing, syntax_ptr.clone()),
543 ast::Expr::MacroStmts(e) => {
544 e.statements().for_each(|s| self.collect_stmt(s));
547 .map(|e| self.collect_expr(e))
548 .unwrap_or_else(|| self.alloc_expr(Expr::Missing, syntax_ptr.clone()));
550 self.alloc_expr(Expr::MacroStmts { tail }, syntax_ptr)
555 fn collect_macro_call<F: FnMut(&mut Self, Option<T>), T: ast::AstNode>(
558 syntax_ptr: AstPtr<ast::Expr>,
559 is_error_recoverable: bool,
562 // File containing the macro call. Expansion errors will be attached here.
563 let outer_file = self.expander.current_file_id;
565 let macro_call = self.expander.to_source(AstPtr::new(&e));
566 let res = self.expander.enter_expand(self.db, e);
568 let res = match res {
570 Err(UnresolvedMacro) => {
571 self.source_map.diagnostics.push(BodyDiagnostic::UnresolvedMacroCall(
572 UnresolvedMacroCall { file: outer_file, node: syntax_ptr.cast().unwrap() },
574 collector(self, None);
580 Some(ExpandError::UnresolvedProcMacro) => {
581 self.source_map.diagnostics.push(BodyDiagnostic::UnresolvedProcMacro(
582 UnresolvedProcMacro {
584 node: syntax_ptr.into(),
585 precise_location: None,
591 self.source_map.diagnostics.push(BodyDiagnostic::MacroError(MacroError {
593 node: syntax_ptr.into(),
594 message: err.to_string(),
601 Some((mark, expansion)) => {
602 // FIXME: Statements are too complicated to recover from error for now.
603 // It is because we don't have any hygiene for local variable expansion right now.
604 if !is_error_recoverable && res.err.is_some() {
605 self.expander.exit(self.db, mark);
606 collector(self, None);
608 self.source_map.expansions.insert(macro_call, self.expander.current_file_id);
610 let id = collector(self, Some(expansion));
611 self.expander.exit(self.db, mark);
615 None => collector(self, None),
619 fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
620 if let Some(expr) = expr {
621 self.collect_expr(expr)
627 fn collect_stmt(&mut self, s: ast::Stmt) {
629 ast::Stmt::LetStmt(stmt) => {
630 if self.check_cfg(&stmt).is_none() {
633 let pat = self.collect_pat_opt(stmt.pat());
635 stmt.ty().map(|it| Interned::new(TypeRef::from_ast(&self.ctx(), it)));
636 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
637 self.statements_in_scope.push(Statement::Let { pat, type_ref, initializer });
639 ast::Stmt::ExprStmt(stmt) => {
640 if self.check_cfg(&stmt).is_none() {
644 // Note that macro could be expended to multiple statements
645 if let Some(ast::Expr::MacroCall(m)) = stmt.expr() {
646 let syntax_ptr = AstPtr::new(&stmt.expr().unwrap());
648 self.collect_macro_call(m, syntax_ptr.clone(), false, |this, expansion| {
651 let statements: ast::MacroStmts = expansion;
653 statements.statements().for_each(|stmt| this.collect_stmt(stmt));
654 if let Some(expr) = statements.expr() {
655 let expr = this.collect_expr(expr);
656 this.statements_in_scope.push(Statement::Expr(expr));
660 let expr = this.alloc_expr(Expr::Missing, syntax_ptr.clone());
661 this.statements_in_scope.push(Statement::Expr(expr));
666 let expr = self.collect_expr_opt(stmt.expr());
667 self.statements_in_scope.push(Statement::Expr(expr));
670 ast::Stmt::Item(item) => {
671 if self.check_cfg(&item).is_none() {
678 fn collect_block(&mut self, block: ast::BlockExpr) -> ExprId {
679 let ast_id = self.expander.ast_id(&block);
681 BlockLoc { ast_id, module: self.expander.def_map.module_id(self.expander.module) };
682 let block_id = self.db.intern_block(block_loc);
684 let (module, def_map) = match self.db.block_def_map(block_id) {
686 self.body.block_scopes.push(block_id);
687 (def_map.root(), def_map)
689 None => (self.expander.module, self.expander.def_map.clone()),
691 let prev_def_map = mem::replace(&mut self.expander.def_map, def_map);
692 let prev_local_module = mem::replace(&mut self.expander.module, module);
693 let prev_statements = std::mem::take(&mut self.statements_in_scope);
695 block.statements().for_each(|s| self.collect_stmt(s));
697 let tail = block.tail_expr().map(|e| self.collect_expr(e));
698 let statements = std::mem::replace(&mut self.statements_in_scope, prev_statements);
699 let syntax_node_ptr = AstPtr::new(&block.into());
700 let expr_id = self.alloc_expr(
701 Expr::Block { id: block_id, statements, tail, label: None },
705 self.expander.def_map = prev_def_map;
706 self.expander.module = prev_local_module;
710 fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
711 if let Some(block) = expr {
712 self.collect_block(block)
718 fn collect_label(&mut self, ast_label: ast::Label) -> LabelId {
720 name: ast_label.lifetime().as_ref().map_or_else(Name::missing, Name::new_lifetime),
722 self.alloc_label(label, AstPtr::new(&ast_label))
725 fn collect_pat(&mut self, pat: ast::Pat) -> PatId {
726 let pattern = match &pat {
727 ast::Pat::IdentPat(bp) => {
728 let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
730 BindingAnnotation::new(bp.mut_token().is_some(), bp.ref_token().is_some());
731 let subpat = bp.pat().map(|subpat| self.collect_pat(subpat));
732 if annotation == BindingAnnotation::Unannotated && subpat.is_none() {
733 // This could also be a single-segment path pattern. To
734 // decide that, we need to try resolving the name.
735 let (resolved, _) = self.expander.def_map.resolve_path(
737 self.expander.module,
738 &name.clone().into(),
739 BuiltinShadowMode::Other,
741 match resolved.take_values() {
742 Some(ModuleDefId::ConstId(_)) => Pat::Path(name.into()),
743 Some(ModuleDefId::EnumVariantId(_)) => {
744 // this is only really valid for unit variants, but
745 // shadowing other enum variants with a pattern is
747 Pat::Path(name.into())
749 Some(ModuleDefId::AdtId(AdtId::StructId(s)))
750 if self.db.struct_data(s).variant_data.kind() != StructKind::Record =>
752 // Funnily enough, record structs *can* be shadowed
753 // by pattern bindings (but unit or tuple structs
755 Pat::Path(name.into())
757 // shadowing statics is an error as well, so we just ignore that case here
758 _ => Pat::Bind { name, mode: annotation, subpat },
761 Pat::Bind { name, mode: annotation, subpat }
764 ast::Pat::TupleStructPat(p) => {
765 let path = p.path().and_then(|path| self.expander.parse_path(path)).map(Box::new);
766 let (args, ellipsis) = self.collect_tuple_pat(p.fields());
767 Pat::TupleStruct { path, args, ellipsis }
769 ast::Pat::RefPat(p) => {
770 let pat = self.collect_pat_opt(p.pat());
771 let mutability = Mutability::from_mutable(p.mut_token().is_some());
772 Pat::Ref { pat, mutability }
774 ast::Pat::PathPat(p) => {
775 let path = p.path().and_then(|path| self.expander.parse_path(path)).map(Box::new);
776 path.map(Pat::Path).unwrap_or(Pat::Missing)
778 ast::Pat::OrPat(p) => {
779 let pats = p.pats().map(|p| self.collect_pat(p)).collect();
782 ast::Pat::ParenPat(p) => return self.collect_pat_opt(p.pat()),
783 ast::Pat::TuplePat(p) => {
784 let (args, ellipsis) = self.collect_tuple_pat(p.fields());
785 Pat::Tuple { args, ellipsis }
787 ast::Pat::WildcardPat(_) => Pat::Wild,
788 ast::Pat::RecordPat(p) => {
789 let path = p.path().and_then(|path| self.expander.parse_path(path)).map(Box::new);
791 .record_pat_field_list()
792 .expect("every struct should have a field list")
795 let ast_pat = f.pat()?;
796 let pat = self.collect_pat(ast_pat);
797 let name = f.field_name()?.as_name();
798 Some(RecordFieldPat { name, pat })
803 .record_pat_field_list()
804 .expect("every struct should have a field list")
808 Pat::Record { path, args, ellipsis }
810 ast::Pat::SlicePat(p) => {
811 let SlicePatComponents { prefix, slice, suffix } = p.components();
813 // FIXME properly handle `RestPat`
815 prefix: prefix.into_iter().map(|p| self.collect_pat(p)).collect(),
816 slice: slice.map(|p| self.collect_pat(p)),
817 suffix: suffix.into_iter().map(|p| self.collect_pat(p)).collect(),
820 ast::Pat::LiteralPat(lit) => {
821 if let Some(ast_lit) = lit.literal() {
822 let expr = Expr::Literal(ast_lit.kind().into());
823 let expr_ptr = AstPtr::new(&ast::Expr::Literal(ast_lit));
824 let expr_id = self.alloc_expr(expr, expr_ptr);
830 ast::Pat::RestPat(_) => {
831 // `RestPat` requires special handling and should not be mapped
832 // to a Pat. Here we are using `Pat::Missing` as a fallback for
833 // when `RestPat` is mapped to `Pat`, which can easily happen
834 // when the source code being analyzed has a malformed pattern
835 // which includes `..` in a place where it isn't valid.
839 ast::Pat::BoxPat(boxpat) => {
840 let inner = self.collect_pat_opt(boxpat.pat());
843 ast::Pat::ConstBlockPat(const_block_pat) => {
844 if let Some(expr) = const_block_pat.block_expr() {
845 let expr_id = self.collect_block(expr);
846 Pat::ConstBlock(expr_id)
852 ast::Pat::RangePat(_) | ast::Pat::MacroPat(_) => Pat::Missing,
854 let ptr = AstPtr::new(&pat);
855 self.alloc_pat(pattern, Either::Left(ptr))
858 fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
859 if let Some(pat) = pat {
860 self.collect_pat(pat)
866 fn collect_tuple_pat(&mut self, args: AstChildren<ast::Pat>) -> (Vec<PatId>, Option<usize>) {
867 // Find the location of the `..`, if there is one. Note that we do not
868 // consider the possibility of there being multiple `..` here.
869 let ellipsis = args.clone().position(|p| matches!(p, ast::Pat::RestPat(_)));
870 // We want to skip the `..` pattern here, since we account for it above.
872 .filter(|p| !matches!(p, ast::Pat::RestPat(_)))
873 .map(|p| self.collect_pat(p))
879 /// Returns `None` (and emits diagnostics) when `owner` if `#[cfg]`d out, and `Some(())` when
881 fn check_cfg(&mut self, owner: &dyn ast::AttrsOwner) -> Option<()> {
882 match self.expander.parse_attrs(self.db, owner).cfg() {
884 if self.expander.cfg_options().check(&cfg) != Some(false) {
888 self.source_map.diagnostics.push(BodyDiagnostic::InactiveCode(InactiveCode {
889 file: self.expander.current_file_id,
890 node: SyntaxNodePtr::new(owner.syntax()),
892 opts: self.expander.cfg_options().clone(),
902 impl From<ast::BinOp> for BinaryOp {
903 fn from(ast_op: ast::BinOp) -> Self {
905 ast::BinOp::BooleanOr => BinaryOp::LogicOp(LogicOp::Or),
906 ast::BinOp::BooleanAnd => BinaryOp::LogicOp(LogicOp::And),
907 ast::BinOp::EqualityTest => BinaryOp::CmpOp(CmpOp::Eq { negated: false }),
908 ast::BinOp::NegatedEqualityTest => BinaryOp::CmpOp(CmpOp::Eq { negated: true }),
909 ast::BinOp::LesserEqualTest => {
910 BinaryOp::CmpOp(CmpOp::Ord { ordering: Ordering::Less, strict: false })
912 ast::BinOp::GreaterEqualTest => {
913 BinaryOp::CmpOp(CmpOp::Ord { ordering: Ordering::Greater, strict: false })
915 ast::BinOp::LesserTest => {
916 BinaryOp::CmpOp(CmpOp::Ord { ordering: Ordering::Less, strict: true })
918 ast::BinOp::GreaterTest => {
919 BinaryOp::CmpOp(CmpOp::Ord { ordering: Ordering::Greater, strict: true })
921 ast::BinOp::Addition => BinaryOp::ArithOp(ArithOp::Add),
922 ast::BinOp::Multiplication => BinaryOp::ArithOp(ArithOp::Mul),
923 ast::BinOp::Subtraction => BinaryOp::ArithOp(ArithOp::Sub),
924 ast::BinOp::Division => BinaryOp::ArithOp(ArithOp::Div),
925 ast::BinOp::Remainder => BinaryOp::ArithOp(ArithOp::Rem),
926 ast::BinOp::LeftShift => BinaryOp::ArithOp(ArithOp::Shl),
927 ast::BinOp::RightShift => BinaryOp::ArithOp(ArithOp::Shr),
928 ast::BinOp::BitwiseXor => BinaryOp::ArithOp(ArithOp::BitXor),
929 ast::BinOp::BitwiseOr => BinaryOp::ArithOp(ArithOp::BitOr),
930 ast::BinOp::BitwiseAnd => BinaryOp::ArithOp(ArithOp::BitAnd),
931 ast::BinOp::Assignment => BinaryOp::Assignment { op: None },
932 ast::BinOp::AddAssign => BinaryOp::Assignment { op: Some(ArithOp::Add) },
933 ast::BinOp::DivAssign => BinaryOp::Assignment { op: Some(ArithOp::Div) },
934 ast::BinOp::MulAssign => BinaryOp::Assignment { op: Some(ArithOp::Mul) },
935 ast::BinOp::RemAssign => BinaryOp::Assignment { op: Some(ArithOp::Rem) },
936 ast::BinOp::ShlAssign => BinaryOp::Assignment { op: Some(ArithOp::Shl) },
937 ast::BinOp::ShrAssign => BinaryOp::Assignment { op: Some(ArithOp::Shr) },
938 ast::BinOp::SubAssign => BinaryOp::Assignment { op: Some(ArithOp::Sub) },
939 ast::BinOp::BitOrAssign => BinaryOp::Assignment { op: Some(ArithOp::BitOr) },
940 ast::BinOp::BitAndAssign => BinaryOp::Assignment { op: Some(ArithOp::BitAnd) },
941 ast::BinOp::BitXorAssign => BinaryOp::Assignment { op: Some(ArithOp::BitXor) },
946 impl From<ast::LiteralKind> for Literal {
947 fn from(ast_lit_kind: ast::LiteralKind) -> Self {
949 LiteralKind::IntNumber(lit) => {
950 if let builtin @ Some(_) = lit.suffix().and_then(BuiltinFloat::from_suffix) {
951 return Literal::Float(Default::default(), builtin);
952 } else if let builtin @ Some(_) =
953 lit.suffix().and_then(|it| BuiltinInt::from_suffix(&it))
955 Literal::Int(Default::default(), builtin)
957 let builtin = lit.suffix().and_then(|it| BuiltinUint::from_suffix(&it));
958 Literal::Uint(Default::default(), builtin)
961 LiteralKind::FloatNumber(lit) => {
962 let ty = lit.suffix().and_then(|it| BuiltinFloat::from_suffix(&it));
963 Literal::Float(Default::default(), ty)
965 LiteralKind::ByteString(_) => Literal::ByteString(Default::default()),
966 LiteralKind::String(_) => Literal::String(Default::default()),
967 LiteralKind::Byte => Literal::Uint(Default::default(), Some(BuiltinUint::U8)),
968 LiteralKind::Bool(val) => Literal::Bool(val),
969 LiteralKind::Char => Literal::Char(Default::default()),