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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2019-11-12 15:53:55 +0000
committerGitHub <[email protected]>2019-11-12 15:53:55 +0000
commit3322d65addd9ec61b8c5bc055803f6549946da8b (patch)
tree19436c04e20caba6646ed1828066d57378726e90
parent2549be750e4c611a582bc0845b1da71e131f1118 (diff)
parentfe5e74e083e6d091c387ba7faa3a571eba9626ec (diff)
Merge #2223
2223: Move expression lowering to hir_def r=matklad a=matklad Co-authored-by: Aleksey Kladov <[email protected]>
Diffstat
-rw-r--r--crates/ra_hir/src/db.rs4
-rw-r--r--crates/ra_hir/src/expr.rs166
-rw-r--r--crates/ra_hir/src/expr/lower.rs593
-rw-r--r--crates/ra_hir/src/marks.rs1
-rw-r--r--crates/ra_hir/src/ty/tests.rs3
-rw-r--r--crates/ra_hir_def/src/body.rs142
-rw-r--r--crates/ra_hir_def/src/body/lower.rs586
-rw-r--r--crates/ra_hir_def/src/expr.rs2
8 files changed, 765 insertions, 732 deletions
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index abf4ae402..9ac811232 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -113,10 +113,10 @@ pub trait HirDatabase: DefDatabase + AstDatabase {
113 #[salsa::invoke(crate::ty::generic_defaults_query)] 113 #[salsa::invoke(crate::ty::generic_defaults_query)]
114 fn generic_defaults(&self, def: GenericDef) -> Substs; 114 fn generic_defaults(&self, def: GenericDef) -> Substs;
115 115
116 #[salsa::invoke(Body::body_with_source_map_query)] 116 #[salsa::invoke(crate::expr::body_with_source_map_query)]
117 fn body_with_source_map(&self, def: DefWithBody) -> (Arc<Body>, Arc<BodySourceMap>); 117 fn body_with_source_map(&self, def: DefWithBody) -> (Arc<Body>, Arc<BodySourceMap>);
118 118
119 #[salsa::invoke(Body::body_query)] 119 #[salsa::invoke(crate::expr::body_query)]
120 fn body(&self, def: DefWithBody) -> Arc<Body>; 120 fn body(&self, def: DefWithBody) -> Arc<Body>;
121 121
122 #[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)] 122 #[salsa::invoke(crate::ty::method_resolution::CrateImplBlocks::impls_in_crate_query)]
diff --git a/crates/ra_hir/src/expr.rs b/crates/ra_hir/src/expr.rs
index ddf605111..82955fa55 100644
--- a/crates/ra_hir/src/expr.rs
+++ b/crates/ra_hir/src/expr.rs
@@ -1,112 +1,52 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2 2
3pub(crate) mod lower;
4pub(crate) mod scope; 3pub(crate) mod scope;
5pub(crate) mod validation; 4pub(crate) mod validation;
6 5
7use std::{ops::Index, sync::Arc}; 6use std::sync::Arc;
8 7
9use ra_arena::{map::ArenaMap, Arena};
10use ra_syntax::{ast, AstPtr}; 8use ra_syntax::{ast, AstPtr};
11use rustc_hash::FxHashMap;
12 9
13use crate::{db::HirDatabase, DefWithBody, Either, HasSource, Resolver, Source}; 10use crate::{db::HirDatabase, DefWithBody, HasSource, Resolver};
14 11
15pub use self::scope::ExprScopes; 12pub use self::scope::ExprScopes;
16 13
17pub use hir_def::expr::{ 14pub use hir_def::{
18 ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp, MatchArm, 15 body::{Body, BodySourceMap, ExprPtr, ExprSource, PatPtr, PatSource},
19 Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, UnaryOp, 16 expr::{
17 ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp,
18 MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, UnaryOp,
19 },
20}; 20};
21 21
22/// The body of an item (function, const etc.). 22pub(crate) fn body_with_source_map_query(
23#[derive(Debug, Eq, PartialEq)] 23 db: &impl HirDatabase,
24pub struct Body { 24 def: DefWithBody,
25 exprs: Arena<ExprId, Expr>, 25) -> (Arc<Body>, Arc<BodySourceMap>) {
26 pats: Arena<PatId, Pat>, 26 let mut params = None;
27 /// The patterns for the function's parameters. While the parameter types are 27
28 /// part of the function signature, the patterns are not (they don't change 28 let (file_id, body) = match def {
29 /// the external type of the function). 29 DefWithBody::Function(f) => {
30 /// 30 let src = f.source(db);
31 /// If this `Body` is for the body of a constant, this will just be 31 params = src.ast.param_list();
32 /// empty. 32 (src.file_id, src.ast.body().map(ast::Expr::from))
33 params: Vec<PatId>, 33 }
34 /// The `ExprId` of the actual body expression. 34 DefWithBody::Const(c) => {
35 body_expr: ExprId, 35 let src = c.source(db);
36 (src.file_id, src.ast.body())
37 }
38 DefWithBody::Static(s) => {
39 let src = s.source(db);
40 (src.file_id, src.ast.body())
41 }
42 };
43 let resolver = hir_def::body::MacroResolver::new(db, def.module(db).id);
44 let (body, source_map) = Body::new(db, resolver, file_id, params, body);
45 (Arc::new(body), Arc::new(source_map))
36} 46}
37 47
38type ExprPtr = Either<AstPtr<ast::Expr>, AstPtr<ast::RecordField>>; 48pub(crate) fn body_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<Body> {
39type ExprSource = Source<ExprPtr>; 49 db.body_with_source_map(def).0
40
41type PatPtr = Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>>;
42type PatSource = Source<PatPtr>;
43
44/// An item body together with the mapping from syntax nodes to HIR expression
45/// IDs. This is needed to go from e.g. a position in a file to the HIR
46/// expression containing it; but for type inference etc., we want to operate on
47/// a structure that is agnostic to the actual positions of expressions in the
48/// file, so that we don't recompute types whenever some whitespace is typed.
49///
50/// One complication here is that, due to macro expansion, a single `Body` might
51/// be spread across several files. So, for each ExprId and PatId, we record
52/// both the HirFileId and the position inside the file. However, we only store
53/// AST -> ExprId mapping for non-macro files, as it is not clear how to handle
54/// this properly for macros.
55#[derive(Default, Debug, Eq, PartialEq)]
56pub struct BodySourceMap {
57 expr_map: FxHashMap<ExprPtr, ExprId>,
58 expr_map_back: ArenaMap<ExprId, ExprSource>,
59 pat_map: FxHashMap<PatPtr, PatId>,
60 pat_map_back: ArenaMap<PatId, PatSource>,
61 field_map: FxHashMap<(ExprId, usize), AstPtr<ast::RecordField>>,
62}
63
64impl Body {
65 pub(crate) fn body_with_source_map_query(
66 db: &impl HirDatabase,
67 def: DefWithBody,
68 ) -> (Arc<Body>, Arc<BodySourceMap>) {
69 let mut params = None;
70
71 let (file_id, body) = match def {
72 DefWithBody::Function(f) => {
73 let src = f.source(db);
74 params = src.ast.param_list();
75 (src.file_id, src.ast.body().map(ast::Expr::from))
76 }
77 DefWithBody::Const(c) => {
78 let src = c.source(db);
79 (src.file_id, src.ast.body())
80 }
81 DefWithBody::Static(s) => {
82 let src = s.source(db);
83 (src.file_id, src.ast.body())
84 }
85 };
86
87 let (body, source_map) = lower::lower(db, def.resolver(db), file_id, params, body);
88 (Arc::new(body), Arc::new(source_map))
89 }
90
91 pub(crate) fn body_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<Body> {
92 db.body_with_source_map(def).0
93 }
94
95 pub fn params(&self) -> &[PatId] {
96 &self.params
97 }
98
99 pub fn body_expr(&self) -> ExprId {
100 self.body_expr
101 }
102
103 pub fn exprs(&self) -> impl Iterator<Item = (ExprId, &Expr)> {
104 self.exprs.iter()
105 }
106
107 pub fn pats(&self) -> impl Iterator<Item = (PatId, &Pat)> {
108 self.pats.iter()
109 }
110} 50}
111 51
112// needs arbitrary_self_types to be a method... or maybe move to the def? 52// needs arbitrary_self_types to be a method... or maybe move to the def?
@@ -132,41 +72,3 @@ pub(crate) fn resolver_for_scope(
132 } 72 }
133 r 73 r
134} 74}
135
136impl Index<ExprId> for Body {
137 type Output = Expr;
138
139 fn index(&self, expr: ExprId) -> &Expr {
140 &self.exprs[expr]
141 }
142}
143
144impl Index<PatId> for Body {
145 type Output = Pat;
146
147 fn index(&self, pat: PatId) -> &Pat {
148 &self.pats[pat]
149 }
150}
151
152impl BodySourceMap {
153 pub(crate) fn expr_syntax(&self, expr: ExprId) -> Option<ExprSource> {
154 self.expr_map_back.get(expr).copied()
155 }
156
157 pub(crate) fn node_expr(&self, node: &ast::Expr) -> Option<ExprId> {
158 self.expr_map.get(&Either::A(AstPtr::new(node))).cloned()
159 }
160
161 pub(crate) fn pat_syntax(&self, pat: PatId) -> Option<PatSource> {
162 self.pat_map_back.get(pat).copied()
163 }
164
165 pub(crate) fn node_pat(&self, node: &ast::Pat) -> Option<PatId> {
166 self.pat_map.get(&Either::A(AstPtr::new(node))).cloned()
167 }
168
169 pub(crate) fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr<ast::RecordField> {
170 self.field_map[&(expr, field)]
171 }
172}
diff --git a/crates/ra_hir/src/expr/lower.rs b/crates/ra_hir/src/expr/lower.rs
deleted file mode 100644
index adc68b23c..000000000
--- a/crates/ra_hir/src/expr/lower.rs
+++ /dev/null
@@ -1,593 +0,0 @@
1//! FIXME: write short doc here
2
3use hir_def::{
4 builtin_type::{BuiltinFloat, BuiltinInt},
5 path::GenericArgs,
6 type_ref::TypeRef,
7};
8use hir_expand::{
9 hygiene::Hygiene,
10 name::{self, AsName, Name},
11};
12use ra_arena::Arena;
13use ra_syntax::{
14 ast::{
15 self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner,
16 TypeAscriptionOwner,
17 },
18 AstNode, AstPtr,
19};
20use test_utils::tested_by;
21
22use crate::{
23 db::HirDatabase, AstId, Either, HirFileId, MacroCallLoc, MacroFileKind, Mutability, Path,
24 Resolver, Source,
25};
26
27use super::{
28 Array, BinaryOp, BindingAnnotation, Body, BodySourceMap, Expr, ExprId, Literal, MatchArm, Pat,
29 PatId, PatPtr, RecordFieldPat, RecordLitField, Statement,
30};
31
32pub(super) fn lower(
33 db: &impl HirDatabase,
34 resolver: Resolver,
35 file_id: HirFileId,
36 params: Option<ast::ParamList>,
37 body: Option<ast::Expr>,
38) -> (Body, BodySourceMap) {
39 ExprCollector {
40 resolver,
41 db,
42 original_file_id: file_id,
43 current_file_id: file_id,
44 source_map: BodySourceMap::default(),
45 body: Body {
46 exprs: Arena::default(),
47 pats: Arena::default(),
48 params: Vec::new(),
49 body_expr: ExprId::dummy(),
50 },
51 }
52 .collect(params, body)
53}
54
55struct ExprCollector<DB> {
56 db: DB,
57 resolver: Resolver,
58 // Expr collector expands macros along the way. original points to the file
59 // we started with, current points to the current macro expansion. source
60 // maps don't support macros yet, so we only record info into source map if
61 // current == original (see #1196)
62 original_file_id: HirFileId,
63 current_file_id: HirFileId,
64
65 body: Body,
66 source_map: BodySourceMap,
67}
68
69impl<'a, DB> ExprCollector<&'a DB>
70where
71 DB: HirDatabase,
72{
73 fn collect(
74 mut self,
75 param_list: Option<ast::ParamList>,
76 body: Option<ast::Expr>,
77 ) -> (Body, BodySourceMap) {
78 if let Some(param_list) = param_list {
79 if let Some(self_param) = param_list.self_param() {
80 let ptr = AstPtr::new(&self_param);
81 let param_pat = self.alloc_pat(
82 Pat::Bind {
83 name: name::SELF_PARAM,
84 mode: BindingAnnotation::Unannotated,
85 subpat: None,
86 },
87 Either::B(ptr),
88 );
89 self.body.params.push(param_pat);
90 }
91
92 for param in param_list.params() {
93 let pat = match param.pat() {
94 None => continue,
95 Some(pat) => pat,
96 };
97 let param_pat = self.collect_pat(pat);
98 self.body.params.push(param_pat);
99 }
100 };
101
102 self.body.body_expr = self.collect_expr_opt(body);
103 (self.body, self.source_map)
104 }
105
106 fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
107 let ptr = Either::A(ptr);
108 let id = self.body.exprs.alloc(expr);
109 if self.current_file_id == self.original_file_id {
110 self.source_map.expr_map.insert(ptr, id);
111 }
112 self.source_map
113 .expr_map_back
114 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
115 id
116 }
117 // desugared exprs don't have ptr, that's wrong and should be fixed
118 // somehow.
119 fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId {
120 self.body.exprs.alloc(expr)
121 }
122 fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr<ast::RecordField>) -> ExprId {
123 let ptr = Either::B(ptr);
124 let id = self.body.exprs.alloc(expr);
125 if self.current_file_id == self.original_file_id {
126 self.source_map.expr_map.insert(ptr, id);
127 }
128 self.source_map
129 .expr_map_back
130 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
131 id
132 }
133 fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId {
134 let id = self.body.pats.alloc(pat);
135 if self.current_file_id == self.original_file_id {
136 self.source_map.pat_map.insert(ptr, id);
137 }
138 self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr });
139 id
140 }
141
142 fn empty_block(&mut self) -> ExprId {
143 let block = Expr::Block { statements: Vec::new(), tail: None };
144 self.body.exprs.alloc(block)
145 }
146
147 fn missing_expr(&mut self) -> ExprId {
148 self.body.exprs.alloc(Expr::Missing)
149 }
150
151 fn missing_pat(&mut self) -> PatId {
152 self.body.pats.alloc(Pat::Missing)
153 }
154
155 fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
156 let syntax_ptr = AstPtr::new(&expr);
157 match expr {
158 ast::Expr::IfExpr(e) => {
159 let then_branch = self.collect_block_opt(e.then_branch());
160
161 let else_branch = e.else_branch().map(|b| match b {
162 ast::ElseBranch::Block(it) => self.collect_block(it),
163 ast::ElseBranch::IfExpr(elif) => {
164 let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap();
165 self.collect_expr(expr)
166 }
167 });
168
169 let condition = match e.condition() {
170 None => self.missing_expr(),
171 Some(condition) => match condition.pat() {
172 None => self.collect_expr_opt(condition.expr()),
173 // if let -- desugar to match
174 Some(pat) => {
175 let pat = self.collect_pat(pat);
176 let match_expr = self.collect_expr_opt(condition.expr());
177 let placeholder_pat = self.missing_pat();
178 let arms = vec![
179 MatchArm { pats: vec![pat], expr: then_branch, guard: None },
180 MatchArm {
181 pats: vec![placeholder_pat],
182 expr: else_branch.unwrap_or_else(|| self.empty_block()),
183 guard: None,
184 },
185 ];
186 return self
187 .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr);
188 }
189 },
190 };
191
192 self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
193 }
194 ast::Expr::TryBlockExpr(e) => {
195 let body = self.collect_block_opt(e.body());
196 self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
197 }
198 ast::Expr::BlockExpr(e) => self.collect_block(e),
199 ast::Expr::LoopExpr(e) => {
200 let body = self.collect_block_opt(e.loop_body());
201 self.alloc_expr(Expr::Loop { body }, syntax_ptr)
202 }
203 ast::Expr::WhileExpr(e) => {
204 let body = self.collect_block_opt(e.loop_body());
205
206 let condition = match e.condition() {
207 None => self.missing_expr(),
208 Some(condition) => match condition.pat() {
209 None => self.collect_expr_opt(condition.expr()),
210 // if let -- desugar to match
211 Some(pat) => {
212 tested_by!(infer_while_let);
213 let pat = self.collect_pat(pat);
214 let match_expr = self.collect_expr_opt(condition.expr());
215 let placeholder_pat = self.missing_pat();
216 let break_ = self.alloc_expr_desugared(Expr::Break { expr: None });
217 let arms = vec![
218 MatchArm { pats: vec![pat], expr: body, guard: None },
219 MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None },
220 ];
221 let match_expr =
222 self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms });
223 return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr);
224 }
225 },
226 };
227
228 self.alloc_expr(Expr::While { condition, body }, syntax_ptr)
229 }
230 ast::Expr::ForExpr(e) => {
231 let iterable = self.collect_expr_opt(e.iterable());
232 let pat = self.collect_pat_opt(e.pat());
233 let body = self.collect_block_opt(e.loop_body());
234 self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr)
235 }
236 ast::Expr::CallExpr(e) => {
237 let callee = self.collect_expr_opt(e.expr());
238 let args = if let Some(arg_list) = e.arg_list() {
239 arg_list.args().map(|e| self.collect_expr(e)).collect()
240 } else {
241 Vec::new()
242 };
243 self.alloc_expr(Expr::Call { callee, args }, syntax_ptr)
244 }
245 ast::Expr::MethodCallExpr(e) => {
246 let receiver = self.collect_expr_opt(e.expr());
247 let args = if let Some(arg_list) = e.arg_list() {
248 arg_list.args().map(|e| self.collect_expr(e)).collect()
249 } else {
250 Vec::new()
251 };
252 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
253 let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast);
254 self.alloc_expr(
255 Expr::MethodCall { receiver, method_name, args, generic_args },
256 syntax_ptr,
257 )
258 }
259 ast::Expr::MatchExpr(e) => {
260 let expr = self.collect_expr_opt(e.expr());
261 let arms = if let Some(match_arm_list) = e.match_arm_list() {
262 match_arm_list
263 .arms()
264 .map(|arm| MatchArm {
265 pats: arm.pats().map(|p| self.collect_pat(p)).collect(),
266 expr: self.collect_expr_opt(arm.expr()),
267 guard: arm
268 .guard()
269 .and_then(|guard| guard.expr())
270 .map(|e| self.collect_expr(e)),
271 })
272 .collect()
273 } else {
274 Vec::new()
275 };
276 self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr)
277 }
278 ast::Expr::PathExpr(e) => {
279 let path = e
280 .path()
281 .and_then(|path| self.parse_path(path))
282 .map(Expr::Path)
283 .unwrap_or(Expr::Missing);
284 self.alloc_expr(path, syntax_ptr)
285 }
286 ast::Expr::ContinueExpr(_e) => {
287 // FIXME: labels
288 self.alloc_expr(Expr::Continue, syntax_ptr)
289 }
290 ast::Expr::BreakExpr(e) => {
291 let expr = e.expr().map(|e| self.collect_expr(e));
292 self.alloc_expr(Expr::Break { expr }, syntax_ptr)
293 }
294 ast::Expr::ParenExpr(e) => {
295 let inner = self.collect_expr_opt(e.expr());
296 // make the paren expr point to the inner expression as well
297 self.source_map.expr_map.insert(Either::A(syntax_ptr), inner);
298 inner
299 }
300 ast::Expr::ReturnExpr(e) => {
301 let expr = e.expr().map(|e| self.collect_expr(e));
302 self.alloc_expr(Expr::Return { expr }, syntax_ptr)
303 }
304 ast::Expr::RecordLit(e) => {
305 let path = e.path().and_then(|path| self.parse_path(path));
306 let mut field_ptrs = Vec::new();
307 let record_lit = if let Some(nfl) = e.record_field_list() {
308 let fields = nfl
309 .fields()
310 .inspect(|field| field_ptrs.push(AstPtr::new(field)))
311 .map(|field| RecordLitField {
312 name: field
313 .name_ref()
314 .map(|nr| nr.as_name())
315 .unwrap_or_else(Name::missing),
316 expr: if let Some(e) = field.expr() {
317 self.collect_expr(e)
318 } else if let Some(nr) = field.name_ref() {
319 // field shorthand
320 self.alloc_expr_field_shorthand(
321 Expr::Path(Path::from_name_ref(&nr)),
322 AstPtr::new(&field),
323 )
324 } else {
325 self.missing_expr()
326 },
327 })
328 .collect();
329 let spread = nfl.spread().map(|s| self.collect_expr(s));
330 Expr::RecordLit { path, fields, spread }
331 } else {
332 Expr::RecordLit { path, fields: Vec::new(), spread: None }
333 };
334
335 let res = self.alloc_expr(record_lit, syntax_ptr);
336 for (i, ptr) in field_ptrs.into_iter().enumerate() {
337 self.source_map.field_map.insert((res, i), ptr);
338 }
339 res
340 }
341 ast::Expr::FieldExpr(e) => {
342 let expr = self.collect_expr_opt(e.expr());
343 let name = match e.field_access() {
344 Some(kind) => kind.as_name(),
345 _ => Name::missing(),
346 };
347 self.alloc_expr(Expr::Field { expr, name }, syntax_ptr)
348 }
349 ast::Expr::AwaitExpr(e) => {
350 let expr = self.collect_expr_opt(e.expr());
351 self.alloc_expr(Expr::Await { expr }, syntax_ptr)
352 }
353 ast::Expr::TryExpr(e) => {
354 let expr = self.collect_expr_opt(e.expr());
355 self.alloc_expr(Expr::Try { expr }, syntax_ptr)
356 }
357 ast::Expr::CastExpr(e) => {
358 let expr = self.collect_expr_opt(e.expr());
359 let type_ref = TypeRef::from_ast_opt(e.type_ref());
360 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
361 }
362 ast::Expr::RefExpr(e) => {
363 let expr = self.collect_expr_opt(e.expr());
364 let mutability = Mutability::from_mutable(e.is_mut());
365 self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr)
366 }
367 ast::Expr::PrefixExpr(e) => {
368 let expr = self.collect_expr_opt(e.expr());
369 if let Some(op) = e.op_kind() {
370 self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
371 } else {
372 self.alloc_expr(Expr::Missing, syntax_ptr)
373 }
374 }
375 ast::Expr::LambdaExpr(e) => {
376 let mut args = Vec::new();
377 let mut arg_types = Vec::new();
378 if let Some(pl) = e.param_list() {
379 for param in pl.params() {
380 let pat = self.collect_pat_opt(param.pat());
381 let type_ref = param.ascribed_type().map(TypeRef::from_ast);
382 args.push(pat);
383 arg_types.push(type_ref);
384 }
385 }
386 let body = self.collect_expr_opt(e.body());
387 self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr)
388 }
389 ast::Expr::BinExpr(e) => {
390 let lhs = self.collect_expr_opt(e.lhs());
391 let rhs = self.collect_expr_opt(e.rhs());
392 let op = e.op_kind().map(BinaryOp::from);
393 self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr)
394 }
395 ast::Expr::TupleExpr(e) => {
396 let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect();
397 self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr)
398 }
399 ast::Expr::BoxExpr(e) => {
400 let expr = self.collect_expr_opt(e.expr());
401 self.alloc_expr(Expr::Box { expr }, syntax_ptr)
402 }
403
404 ast::Expr::ArrayExpr(e) => {
405 let kind = e.kind();
406
407 match kind {
408 ArrayExprKind::ElementList(e) => {
409 let exprs = e.map(|expr| self.collect_expr(expr)).collect();
410 self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr)
411 }
412 ArrayExprKind::Repeat { initializer, repeat } => {
413 let initializer = self.collect_expr_opt(initializer);
414 let repeat = self.collect_expr_opt(repeat);
415 self.alloc_expr(
416 Expr::Array(Array::Repeat { initializer, repeat }),
417 syntax_ptr,
418 )
419 }
420 }
421 }
422
423 ast::Expr::Literal(e) => {
424 let lit = match e.kind() {
425 LiteralKind::IntNumber { suffix } => {
426 let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it));
427
428 Literal::Int(Default::default(), known_name)
429 }
430 LiteralKind::FloatNumber { suffix } => {
431 let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it));
432
433 Literal::Float(Default::default(), known_name)
434 }
435 LiteralKind::ByteString => Literal::ByteString(Default::default()),
436 LiteralKind::String => Literal::String(Default::default()),
437 LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)),
438 LiteralKind::Bool => Literal::Bool(Default::default()),
439 LiteralKind::Char => Literal::Char(Default::default()),
440 };
441 self.alloc_expr(Expr::Literal(lit), syntax_ptr)
442 }
443 ast::Expr::IndexExpr(e) => {
444 let base = self.collect_expr_opt(e.base());
445 let index = self.collect_expr_opt(e.index());
446 self.alloc_expr(Expr::Index { base, index }, syntax_ptr)
447 }
448
449 // FIXME implement HIR for these:
450 ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
451 ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
452 ast::Expr::MacroCall(e) => {
453 let ast_id = AstId::new(
454 self.current_file_id,
455 self.db.ast_id_map(self.current_file_id).ast_id(&e),
456 );
457
458 if let Some(path) = e.path().and_then(|path| self.parse_path(path)) {
459 if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) {
460 let call_id = self.db.intern_macro(MacroCallLoc { def: def.id, ast_id });
461 let file_id = call_id.as_file(MacroFileKind::Expr);
462 if let Some(node) = self.db.parse_or_expand(file_id) {
463 if let Some(expr) = ast::Expr::cast(node) {
464 log::debug!("macro expansion {:#?}", expr.syntax());
465 let old_file_id =
466 std::mem::replace(&mut self.current_file_id, file_id);
467 let id = self.collect_expr(expr);
468 self.current_file_id = old_file_id;
469 return id;
470 }
471 }
472 }
473 }
474 // FIXME: Instead of just dropping the error from expansion
475 // report it
476 self.alloc_expr(Expr::Missing, syntax_ptr)
477 }
478 }
479 }
480
481 fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
482 if let Some(expr) = expr {
483 self.collect_expr(expr)
484 } else {
485 self.missing_expr()
486 }
487 }
488
489 fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId {
490 let syntax_node_ptr = AstPtr::new(&expr.clone().into());
491 let block = match expr.block() {
492 Some(block) => block,
493 None => return self.alloc_expr(Expr::Missing, syntax_node_ptr),
494 };
495 let statements = block
496 .statements()
497 .map(|s| match s {
498 ast::Stmt::LetStmt(stmt) => {
499 let pat = self.collect_pat_opt(stmt.pat());
500 let type_ref = stmt.ascribed_type().map(TypeRef::from_ast);
501 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
502 Statement::Let { pat, type_ref, initializer }
503 }
504 ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())),
505 })
506 .collect();
507 let tail = block.expr().map(|e| self.collect_expr(e));
508 self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr)
509 }
510
511 fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
512 if let Some(block) = expr {
513 self.collect_block(block)
514 } else {
515 self.missing_expr()
516 }
517 }
518
519 fn collect_pat(&mut self, pat: ast::Pat) -> PatId {
520 let pattern = match &pat {
521 ast::Pat::BindPat(bp) => {
522 let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
523 let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref());
524 let subpat = bp.pat().map(|subpat| self.collect_pat(subpat));
525 Pat::Bind { name, mode: annotation, subpat }
526 }
527 ast::Pat::TupleStructPat(p) => {
528 let path = p.path().and_then(|path| self.parse_path(path));
529 let args = p.args().map(|p| self.collect_pat(p)).collect();
530 Pat::TupleStruct { path, args }
531 }
532 ast::Pat::RefPat(p) => {
533 let pat = self.collect_pat_opt(p.pat());
534 let mutability = Mutability::from_mutable(p.is_mut());
535 Pat::Ref { pat, mutability }
536 }
537 ast::Pat::PathPat(p) => {
538 let path = p.path().and_then(|path| self.parse_path(path));
539 path.map(Pat::Path).unwrap_or(Pat::Missing)
540 }
541 ast::Pat::TuplePat(p) => {
542 let args = p.args().map(|p| self.collect_pat(p)).collect();
543 Pat::Tuple(args)
544 }
545 ast::Pat::PlaceholderPat(_) => Pat::Wild,
546 ast::Pat::RecordPat(p) => {
547 let path = p.path().and_then(|path| self.parse_path(path));
548 let record_field_pat_list =
549 p.record_field_pat_list().expect("every struct should have a field list");
550 let mut fields: Vec<_> = record_field_pat_list
551 .bind_pats()
552 .filter_map(|bind_pat| {
553 let ast_pat =
554 ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat");
555 let pat = self.collect_pat(ast_pat);
556 let name = bind_pat.name()?.as_name();
557 Some(RecordFieldPat { name, pat })
558 })
559 .collect();
560 let iter = record_field_pat_list.record_field_pats().filter_map(|f| {
561 let ast_pat = f.pat()?;
562 let pat = self.collect_pat(ast_pat);
563 let name = f.name()?.as_name();
564 Some(RecordFieldPat { name, pat })
565 });
566 fields.extend(iter);
567
568 Pat::Record { path, args: fields }
569 }
570
571 // FIXME: implement
572 ast::Pat::DotDotPat(_) => Pat::Missing,
573 ast::Pat::BoxPat(_) => Pat::Missing,
574 ast::Pat::LiteralPat(_) => Pat::Missing,
575 ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing,
576 };
577 let ptr = AstPtr::new(&pat);
578 self.alloc_pat(pattern, Either::A(ptr))
579 }
580
581 fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
582 if let Some(pat) = pat {
583 self.collect_pat(pat)
584 } else {
585 self.missing_pat()
586 }
587 }
588
589 fn parse_path(&mut self, path: ast::Path) -> Option<Path> {
590 let hygiene = Hygiene::new(self.db, self.current_file_id);
591 Path::from_src(path, &hygiene)
592 }
593}
diff --git a/crates/ra_hir/src/marks.rs b/crates/ra_hir/src/marks.rs
index 0d4fa5b67..0f754eb9c 100644
--- a/crates/ra_hir/src/marks.rs
+++ b/crates/ra_hir/src/marks.rs
@@ -5,6 +5,5 @@ test_utils::marks!(
5 type_var_cycles_resolve_as_possible 5 type_var_cycles_resolve_as_possible
6 type_var_resolves_to_int_var 6 type_var_resolves_to_int_var
7 match_ergonomics_ref 7 match_ergonomics_ref
8 infer_while_let
9 coerce_merge_fail_fallback 8 coerce_merge_fail_fallback
10); 9);
diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs
index 896bf2924..8863c3608 100644
--- a/crates/ra_hir/src/ty/tests.rs
+++ b/crates/ra_hir/src/ty/tests.rs
@@ -222,7 +222,6 @@ mod collections {
222 222
223#[test] 223#[test]
224fn infer_while_let() { 224fn infer_while_let() {
225 covers!(infer_while_let);
226 let (db, pos) = TestDB::with_position( 225 let (db, pos) = TestDB::with_position(
227 r#" 226 r#"
228//- /main.rs 227//- /main.rs
@@ -4825,7 +4824,7 @@ fn main() {
4825 @r###" 4824 @r###"
4826 ![0; 1) '6': i32 4825 ![0; 1) '6': i32
4827 [64; 88) '{ ...!(); }': () 4826 [64; 88) '{ ...!(); }': ()
4828 [74; 75) 'x': i32 4827 [74; 75) 'x': i32
4829 "### 4828 "###
4830 ); 4829 );
4831} 4830}
diff --git a/crates/ra_hir_def/src/body.rs b/crates/ra_hir_def/src/body.rs
index 7447904ea..ac8f8261b 100644
--- a/crates/ra_hir_def/src/body.rs
+++ b/crates/ra_hir_def/src/body.rs
@@ -1,2 +1,144 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2mod lower; 2mod lower;
3
4use std::{ops::Index, sync::Arc};
5
6use hir_expand::{either::Either, HirFileId, MacroDefId, Source};
7use ra_arena::{map::ArenaMap, Arena};
8use ra_syntax::{ast, AstPtr};
9use rustc_hash::FxHashMap;
10
11use crate::{
12 db::DefDatabase2,
13 expr::{Expr, ExprId, Pat, PatId},
14 nameres::CrateDefMap,
15 path::Path,
16 ModuleId,
17};
18
19pub struct MacroResolver {
20 crate_def_map: Arc<CrateDefMap>,
21 module: ModuleId,
22}
23
24impl MacroResolver {
25 pub fn new(db: &impl DefDatabase2, module: ModuleId) -> MacroResolver {
26 MacroResolver { crate_def_map: db.crate_def_map(module.krate), module }
27 }
28
29 pub(crate) fn resolve_path_as_macro(
30 &self,
31 db: &impl DefDatabase2,
32 path: &Path,
33 ) -> Option<MacroDefId> {
34 self.crate_def_map.resolve_path(db, self.module.module_id, path).0.get_macros()
35 }
36}
37
38/// The body of an item (function, const etc.).
39#[derive(Debug, Eq, PartialEq)]
40pub struct Body {
41 exprs: Arena<ExprId, Expr>,
42 pats: Arena<PatId, Pat>,
43 /// The patterns for the function's parameters. While the parameter types are
44 /// part of the function signature, the patterns are not (they don't change
45 /// the external type of the function).
46 ///
47 /// If this `Body` is for the body of a constant, this will just be
48 /// empty.
49 params: Vec<PatId>,
50 /// The `ExprId` of the actual body expression.
51 body_expr: ExprId,
52}
53
54pub type ExprPtr = Either<AstPtr<ast::Expr>, AstPtr<ast::RecordField>>;
55pub type ExprSource = Source<ExprPtr>;
56
57pub type PatPtr = Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>>;
58pub type PatSource = Source<PatPtr>;
59
60/// An item body together with the mapping from syntax nodes to HIR expression
61/// IDs. This is needed to go from e.g. a position in a file to the HIR
62/// expression containing it; but for type inference etc., we want to operate on
63/// a structure that is agnostic to the actual positions of expressions in the
64/// file, so that we don't recompute types whenever some whitespace is typed.
65///
66/// One complication here is that, due to macro expansion, a single `Body` might
67/// be spread across several files. So, for each ExprId and PatId, we record
68/// both the HirFileId and the position inside the file. However, we only store
69/// AST -> ExprId mapping for non-macro files, as it is not clear how to handle
70/// this properly for macros.
71#[derive(Default, Debug, Eq, PartialEq)]
72pub struct BodySourceMap {
73 expr_map: FxHashMap<ExprPtr, ExprId>,
74 expr_map_back: ArenaMap<ExprId, ExprSource>,
75 pat_map: FxHashMap<PatPtr, PatId>,
76 pat_map_back: ArenaMap<PatId, PatSource>,
77 field_map: FxHashMap<(ExprId, usize), AstPtr<ast::RecordField>>,
78}
79
80impl Body {
81 pub fn new(
82 db: &impl DefDatabase2,
83 resolver: MacroResolver,
84 file_id: HirFileId,
85 params: Option<ast::ParamList>,
86 body: Option<ast::Expr>,
87 ) -> (Body, BodySourceMap) {
88 lower::lower(db, resolver, file_id, params, body)
89 }
90
91 pub fn params(&self) -> &[PatId] {
92 &self.params
93 }
94
95 pub fn body_expr(&self) -> ExprId {
96 self.body_expr
97 }
98
99 pub fn exprs(&self) -> impl Iterator<Item = (ExprId, &Expr)> {
100 self.exprs.iter()
101 }
102
103 pub fn pats(&self) -> impl Iterator<Item = (PatId, &Pat)> {
104 self.pats.iter()
105 }
106}
107
108impl Index<ExprId> for Body {
109 type Output = Expr;
110
111 fn index(&self, expr: ExprId) -> &Expr {
112 &self.exprs[expr]
113 }
114}
115
116impl Index<PatId> for Body {
117 type Output = Pat;
118
119 fn index(&self, pat: PatId) -> &Pat {
120 &self.pats[pat]
121 }
122}
123
124impl BodySourceMap {
125 pub fn expr_syntax(&self, expr: ExprId) -> Option<ExprSource> {
126 self.expr_map_back.get(expr).copied()
127 }
128
129 pub fn node_expr(&self, node: &ast::Expr) -> Option<ExprId> {
130 self.expr_map.get(&Either::A(AstPtr::new(node))).cloned()
131 }
132
133 pub fn pat_syntax(&self, pat: PatId) -> Option<PatSource> {
134 self.pat_map_back.get(pat).copied()
135 }
136
137 pub fn node_pat(&self, node: &ast::Pat) -> Option<PatId> {
138 self.pat_map.get(&Either::A(AstPtr::new(node))).cloned()
139 }
140
141 pub fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr<ast::RecordField> {
142 self.field_map[&(expr, field)]
143 }
144}
diff --git a/crates/ra_hir_def/src/body/lower.rs b/crates/ra_hir_def/src/body/lower.rs
index 1a144b1f9..2aa863c9e 100644
--- a/crates/ra_hir_def/src/body/lower.rs
+++ b/crates/ra_hir_def/src/body/lower.rs
@@ -1,8 +1,590 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2 2
3use ra_syntax::ast; 3use hir_expand::{
4 either::Either,
5 hygiene::Hygiene,
6 name::{self, AsName, Name},
7 AstId, HirFileId, MacroCallLoc, MacroFileKind, Source,
8};
9use ra_arena::Arena;
10use ra_syntax::{
11 ast::{
12 self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner,
13 TypeAscriptionOwner,
14 },
15 AstNode, AstPtr,
16};
4 17
5use crate::expr::{ArithOp, BinaryOp, CmpOp, LogicOp, Ordering}; 18use crate::{
19 body::{Body, BodySourceMap, MacroResolver, PatPtr},
20 builtin_type::{BuiltinFloat, BuiltinInt},
21 db::DefDatabase2,
22 expr::{
23 ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp,
24 MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement,
25 },
26 path::GenericArgs,
27 path::Path,
28 type_ref::{Mutability, TypeRef},
29};
30
31pub(super) fn lower(
32 db: &impl DefDatabase2,
33 resolver: MacroResolver,
34 file_id: HirFileId,
35 params: Option<ast::ParamList>,
36 body: Option<ast::Expr>,
37) -> (Body, BodySourceMap) {
38 ExprCollector {
39 resolver,
40 db,
41 original_file_id: file_id,
42 current_file_id: file_id,
43 source_map: BodySourceMap::default(),
44 body: Body {
45 exprs: Arena::default(),
46 pats: Arena::default(),
47 params: Vec::new(),
48 body_expr: ExprId::dummy(),
49 },
50 }
51 .collect(params, body)
52}
53
54struct ExprCollector<DB> {
55 db: DB,
56 resolver: MacroResolver,
57 original_file_id: HirFileId,
58 current_file_id: HirFileId,
59
60 body: Body,
61 source_map: BodySourceMap,
62}
63
64impl<'a, DB> ExprCollector<&'a DB>
65where
66 DB: DefDatabase2,
67{
68 fn collect(
69 mut self,
70 param_list: Option<ast::ParamList>,
71 body: Option<ast::Expr>,
72 ) -> (Body, BodySourceMap) {
73 if let Some(param_list) = param_list {
74 if let Some(self_param) = param_list.self_param() {
75 let ptr = AstPtr::new(&self_param);
76 let param_pat = self.alloc_pat(
77 Pat::Bind {
78 name: name::SELF_PARAM,
79 mode: BindingAnnotation::Unannotated,
80 subpat: None,
81 },
82 Either::B(ptr),
83 );
84 self.body.params.push(param_pat);
85 }
86
87 for param in param_list.params() {
88 let pat = match param.pat() {
89 None => continue,
90 Some(pat) => pat,
91 };
92 let param_pat = self.collect_pat(pat);
93 self.body.params.push(param_pat);
94 }
95 };
96
97 self.body.body_expr = self.collect_expr_opt(body);
98 (self.body, self.source_map)
99 }
100
101 fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
102 let ptr = Either::A(ptr);
103 let id = self.body.exprs.alloc(expr);
104 if self.current_file_id == self.original_file_id {
105 self.source_map.expr_map.insert(ptr, id);
106 }
107 self.source_map
108 .expr_map_back
109 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
110 id
111 }
112 // desugared exprs don't have ptr, that's wrong and should be fixed
113 // somehow.
114 fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId {
115 self.body.exprs.alloc(expr)
116 }
117 fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr<ast::RecordField>) -> ExprId {
118 let ptr = Either::B(ptr);
119 let id = self.body.exprs.alloc(expr);
120 if self.current_file_id == self.original_file_id {
121 self.source_map.expr_map.insert(ptr, id);
122 }
123 self.source_map
124 .expr_map_back
125 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
126 id
127 }
128 fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId {
129 let id = self.body.pats.alloc(pat);
130 if self.current_file_id == self.original_file_id {
131 self.source_map.pat_map.insert(ptr, id);
132 }
133 self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr });
134 id
135 }
136
137 fn empty_block(&mut self) -> ExprId {
138 let block = Expr::Block { statements: Vec::new(), tail: None };
139 self.body.exprs.alloc(block)
140 }
141
142 fn missing_expr(&mut self) -> ExprId {
143 self.body.exprs.alloc(Expr::Missing)
144 }
145
146 fn missing_pat(&mut self) -> PatId {
147 self.body.pats.alloc(Pat::Missing)
148 }
149
150 fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
151 let syntax_ptr = AstPtr::new(&expr);
152 match expr {
153 ast::Expr::IfExpr(e) => {
154 let then_branch = self.collect_block_opt(e.then_branch());
155
156 let else_branch = e.else_branch().map(|b| match b {
157 ast::ElseBranch::Block(it) => self.collect_block(it),
158 ast::ElseBranch::IfExpr(elif) => {
159 let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap();
160 self.collect_expr(expr)
161 }
162 });
163
164 let condition = match e.condition() {
165 None => self.missing_expr(),
166 Some(condition) => match condition.pat() {
167 None => self.collect_expr_opt(condition.expr()),
168 // if let -- desugar to match
169 Some(pat) => {
170 let pat = self.collect_pat(pat);
171 let match_expr = self.collect_expr_opt(condition.expr());
172 let placeholder_pat = self.missing_pat();
173 let arms = vec![
174 MatchArm { pats: vec![pat], expr: then_branch, guard: None },
175 MatchArm {
176 pats: vec![placeholder_pat],
177 expr: else_branch.unwrap_or_else(|| self.empty_block()),
178 guard: None,
179 },
180 ];
181 return self
182 .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr);
183 }
184 },
185 };
186
187 self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
188 }
189 ast::Expr::TryBlockExpr(e) => {
190 let body = self.collect_block_opt(e.body());
191 self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
192 }
193 ast::Expr::BlockExpr(e) => self.collect_block(e),
194 ast::Expr::LoopExpr(e) => {
195 let body = self.collect_block_opt(e.loop_body());
196 self.alloc_expr(Expr::Loop { body }, syntax_ptr)
197 }
198 ast::Expr::WhileExpr(e) => {
199 let body = self.collect_block_opt(e.loop_body());
200
201 let condition = match e.condition() {
202 None => self.missing_expr(),
203 Some(condition) => match condition.pat() {
204 None => self.collect_expr_opt(condition.expr()),
205 // if let -- desugar to match
206 Some(pat) => {
207 let pat = self.collect_pat(pat);
208 let match_expr = self.collect_expr_opt(condition.expr());
209 let placeholder_pat = self.missing_pat();
210 let break_ = self.alloc_expr_desugared(Expr::Break { expr: None });
211 let arms = vec![
212 MatchArm { pats: vec![pat], expr: body, guard: None },
213 MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None },
214 ];
215 let match_expr =
216 self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms });
217 return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr);
218 }
219 },
220 };
221
222 self.alloc_expr(Expr::While { condition, body }, syntax_ptr)
223 }
224 ast::Expr::ForExpr(e) => {
225 let iterable = self.collect_expr_opt(e.iterable());
226 let pat = self.collect_pat_opt(e.pat());
227 let body = self.collect_block_opt(e.loop_body());
228 self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr)
229 }
230 ast::Expr::CallExpr(e) => {
231 let callee = self.collect_expr_opt(e.expr());
232 let args = if let Some(arg_list) = e.arg_list() {
233 arg_list.args().map(|e| self.collect_expr(e)).collect()
234 } else {
235 Vec::new()
236 };
237 self.alloc_expr(Expr::Call { callee, args }, syntax_ptr)
238 }
239 ast::Expr::MethodCallExpr(e) => {
240 let receiver = self.collect_expr_opt(e.expr());
241 let args = if let Some(arg_list) = e.arg_list() {
242 arg_list.args().map(|e| self.collect_expr(e)).collect()
243 } else {
244 Vec::new()
245 };
246 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
247 let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast);
248 self.alloc_expr(
249 Expr::MethodCall { receiver, method_name, args, generic_args },
250 syntax_ptr,
251 )
252 }
253 ast::Expr::MatchExpr(e) => {
254 let expr = self.collect_expr_opt(e.expr());
255 let arms = if let Some(match_arm_list) = e.match_arm_list() {
256 match_arm_list
257 .arms()
258 .map(|arm| MatchArm {
259 pats: arm.pats().map(|p| self.collect_pat(p)).collect(),
260 expr: self.collect_expr_opt(arm.expr()),
261 guard: arm
262 .guard()
263 .and_then(|guard| guard.expr())
264 .map(|e| self.collect_expr(e)),
265 })
266 .collect()
267 } else {
268 Vec::new()
269 };
270 self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr)
271 }
272 ast::Expr::PathExpr(e) => {
273 let path = e
274 .path()
275 .and_then(|path| self.parse_path(path))
276 .map(Expr::Path)
277 .unwrap_or(Expr::Missing);
278 self.alloc_expr(path, syntax_ptr)
279 }
280 ast::Expr::ContinueExpr(_e) => {
281 // FIXME: labels
282 self.alloc_expr(Expr::Continue, syntax_ptr)
283 }
284 ast::Expr::BreakExpr(e) => {
285 let expr = e.expr().map(|e| self.collect_expr(e));
286 self.alloc_expr(Expr::Break { expr }, syntax_ptr)
287 }
288 ast::Expr::ParenExpr(e) => {
289 let inner = self.collect_expr_opt(e.expr());
290 // make the paren expr point to the inner expression as well
291 self.source_map.expr_map.insert(Either::A(syntax_ptr), inner);
292 inner
293 }
294 ast::Expr::ReturnExpr(e) => {
295 let expr = e.expr().map(|e| self.collect_expr(e));
296 self.alloc_expr(Expr::Return { expr }, syntax_ptr)
297 }
298 ast::Expr::RecordLit(e) => {
299 let path = e.path().and_then(|path| self.parse_path(path));
300 let mut field_ptrs = Vec::new();
301 let record_lit = if let Some(nfl) = e.record_field_list() {
302 let fields = nfl
303 .fields()
304 .inspect(|field| field_ptrs.push(AstPtr::new(field)))
305 .map(|field| RecordLitField {
306 name: field
307 .name_ref()
308 .map(|nr| nr.as_name())
309 .unwrap_or_else(Name::missing),
310 expr: if let Some(e) = field.expr() {
311 self.collect_expr(e)
312 } else if let Some(nr) = field.name_ref() {
313 // field shorthand
314 self.alloc_expr_field_shorthand(
315 Expr::Path(Path::from_name_ref(&nr)),
316 AstPtr::new(&field),
317 )
318 } else {
319 self.missing_expr()
320 },
321 })
322 .collect();
323 let spread = nfl.spread().map(|s| self.collect_expr(s));
324 Expr::RecordLit { path, fields, spread }
325 } else {
326 Expr::RecordLit { path, fields: Vec::new(), spread: None }
327 };
328
329 let res = self.alloc_expr(record_lit, syntax_ptr);
330 for (i, ptr) in field_ptrs.into_iter().enumerate() {
331 self.source_map.field_map.insert((res, i), ptr);
332 }
333 res
334 }
335 ast::Expr::FieldExpr(e) => {
336 let expr = self.collect_expr_opt(e.expr());
337 let name = match e.field_access() {
338 Some(kind) => kind.as_name(),
339 _ => Name::missing(),
340 };
341 self.alloc_expr(Expr::Field { expr, name }, syntax_ptr)
342 }
343 ast::Expr::AwaitExpr(e) => {
344 let expr = self.collect_expr_opt(e.expr());
345 self.alloc_expr(Expr::Await { expr }, syntax_ptr)
346 }
347 ast::Expr::TryExpr(e) => {
348 let expr = self.collect_expr_opt(e.expr());
349 self.alloc_expr(Expr::Try { expr }, syntax_ptr)
350 }
351 ast::Expr::CastExpr(e) => {
352 let expr = self.collect_expr_opt(e.expr());
353 let type_ref = TypeRef::from_ast_opt(e.type_ref());
354 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
355 }
356 ast::Expr::RefExpr(e) => {
357 let expr = self.collect_expr_opt(e.expr());
358 let mutability = Mutability::from_mutable(e.is_mut());
359 self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr)
360 }
361 ast::Expr::PrefixExpr(e) => {
362 let expr = self.collect_expr_opt(e.expr());
363 if let Some(op) = e.op_kind() {
364 self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
365 } else {
366 self.alloc_expr(Expr::Missing, syntax_ptr)
367 }
368 }
369 ast::Expr::LambdaExpr(e) => {
370 let mut args = Vec::new();
371 let mut arg_types = Vec::new();
372 if let Some(pl) = e.param_list() {
373 for param in pl.params() {
374 let pat = self.collect_pat_opt(param.pat());
375 let type_ref = param.ascribed_type().map(TypeRef::from_ast);
376 args.push(pat);
377 arg_types.push(type_ref);
378 }
379 }
380 let body = self.collect_expr_opt(e.body());
381 self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr)
382 }
383 ast::Expr::BinExpr(e) => {
384 let lhs = self.collect_expr_opt(e.lhs());
385 let rhs = self.collect_expr_opt(e.rhs());
386 let op = e.op_kind().map(BinaryOp::from);
387 self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr)
388 }
389 ast::Expr::TupleExpr(e) => {
390 let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect();
391 self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr)
392 }
393 ast::Expr::BoxExpr(e) => {
394 let expr = self.collect_expr_opt(e.expr());
395 self.alloc_expr(Expr::Box { expr }, syntax_ptr)
396 }
397
398 ast::Expr::ArrayExpr(e) => {
399 let kind = e.kind();
400
401 match kind {
402 ArrayExprKind::ElementList(e) => {
403 let exprs = e.map(|expr| self.collect_expr(expr)).collect();
404 self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr)
405 }
406 ArrayExprKind::Repeat { initializer, repeat } => {
407 let initializer = self.collect_expr_opt(initializer);
408 let repeat = self.collect_expr_opt(repeat);
409 self.alloc_expr(
410 Expr::Array(Array::Repeat { initializer, repeat }),
411 syntax_ptr,
412 )
413 }
414 }
415 }
416
417 ast::Expr::Literal(e) => {
418 let lit = match e.kind() {
419 LiteralKind::IntNumber { suffix } => {
420 let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it));
421
422 Literal::Int(Default::default(), known_name)
423 }
424 LiteralKind::FloatNumber { suffix } => {
425 let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it));
426
427 Literal::Float(Default::default(), known_name)
428 }
429 LiteralKind::ByteString => Literal::ByteString(Default::default()),
430 LiteralKind::String => Literal::String(Default::default()),
431 LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)),
432 LiteralKind::Bool => Literal::Bool(Default::default()),
433 LiteralKind::Char => Literal::Char(Default::default()),
434 };
435 self.alloc_expr(Expr::Literal(lit), syntax_ptr)
436 }
437 ast::Expr::IndexExpr(e) => {
438 let base = self.collect_expr_opt(e.base());
439 let index = self.collect_expr_opt(e.index());
440 self.alloc_expr(Expr::Index { base, index }, syntax_ptr)
441 }
442
443 // FIXME implement HIR for these:
444 ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
445 ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
446 ast::Expr::MacroCall(e) => {
447 let ast_id = AstId::new(
448 self.current_file_id,
449 self.db.ast_id_map(self.current_file_id).ast_id(&e),
450 );
451
452 if let Some(path) = e.path().and_then(|path| self.parse_path(path)) {
453 if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) {
454 let call_id = self.db.intern_macro(MacroCallLoc { def, ast_id });
455 let file_id = call_id.as_file(MacroFileKind::Expr);
456 if let Some(node) = self.db.parse_or_expand(file_id) {
457 if let Some(expr) = ast::Expr::cast(node) {
458 log::debug!("macro expansion {:#?}", expr.syntax());
459 let old_file_id =
460 std::mem::replace(&mut self.current_file_id, file_id);
461 let id = self.collect_expr(expr);
462 self.current_file_id = old_file_id;
463 return id;
464 }
465 }
466 }
467 }
468 // FIXME: Instead of just dropping the error from expansion
469 // report it
470 self.alloc_expr(Expr::Missing, syntax_ptr)
471 }
472 }
473 }
474
475 fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
476 if let Some(expr) = expr {
477 self.collect_expr(expr)
478 } else {
479 self.missing_expr()
480 }
481 }
482
483 fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId {
484 let syntax_node_ptr = AstPtr::new(&expr.clone().into());
485 let block = match expr.block() {
486 Some(block) => block,
487 None => return self.alloc_expr(Expr::Missing, syntax_node_ptr),
488 };
489 let statements = block
490 .statements()
491 .map(|s| match s {
492 ast::Stmt::LetStmt(stmt) => {
493 let pat = self.collect_pat_opt(stmt.pat());
494 let type_ref = stmt.ascribed_type().map(TypeRef::from_ast);
495 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
496 Statement::Let { pat, type_ref, initializer }
497 }
498 ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())),
499 })
500 .collect();
501 let tail = block.expr().map(|e| self.collect_expr(e));
502 self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr)
503 }
504
505 fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
506 if let Some(block) = expr {
507 self.collect_block(block)
508 } else {
509 self.missing_expr()
510 }
511 }
512
513 fn collect_pat(&mut self, pat: ast::Pat) -> PatId {
514 let pattern = match &pat {
515 ast::Pat::BindPat(bp) => {
516 let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
517 let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref());
518 let subpat = bp.pat().map(|subpat| self.collect_pat(subpat));
519 Pat::Bind { name, mode: annotation, subpat }
520 }
521 ast::Pat::TupleStructPat(p) => {
522 let path = p.path().and_then(|path| self.parse_path(path));
523 let args = p.args().map(|p| self.collect_pat(p)).collect();
524 Pat::TupleStruct { path, args }
525 }
526 ast::Pat::RefPat(p) => {
527 let pat = self.collect_pat_opt(p.pat());
528 let mutability = Mutability::from_mutable(p.is_mut());
529 Pat::Ref { pat, mutability }
530 }
531 ast::Pat::PathPat(p) => {
532 let path = p.path().and_then(|path| self.parse_path(path));
533 path.map(Pat::Path).unwrap_or(Pat::Missing)
534 }
535 ast::Pat::TuplePat(p) => {
536 let args = p.args().map(|p| self.collect_pat(p)).collect();
537 Pat::Tuple(args)
538 }
539 ast::Pat::PlaceholderPat(_) => Pat::Wild,
540 ast::Pat::RecordPat(p) => {
541 let path = p.path().and_then(|path| self.parse_path(path));
542 let record_field_pat_list =
543 p.record_field_pat_list().expect("every struct should have a field list");
544 let mut fields: Vec<_> = record_field_pat_list
545 .bind_pats()
546 .filter_map(|bind_pat| {
547 let ast_pat =
548 ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat");
549 let pat = self.collect_pat(ast_pat);
550 let name = bind_pat.name()?.as_name();
551 Some(RecordFieldPat { name, pat })
552 })
553 .collect();
554 let iter = record_field_pat_list.record_field_pats().filter_map(|f| {
555 let ast_pat = f.pat()?;
556 let pat = self.collect_pat(ast_pat);
557 let name = f.name()?.as_name();
558 Some(RecordFieldPat { name, pat })
559 });
560 fields.extend(iter);
561
562 Pat::Record { path, args: fields }
563 }
564
565 // FIXME: implement
566 ast::Pat::DotDotPat(_) => Pat::Missing,
567 ast::Pat::BoxPat(_) => Pat::Missing,
568 ast::Pat::LiteralPat(_) => Pat::Missing,
569 ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing,
570 };
571 let ptr = AstPtr::new(&pat);
572 self.alloc_pat(pattern, Either::A(ptr))
573 }
574
575 fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
576 if let Some(pat) = pat {
577 self.collect_pat(pat)
578 } else {
579 self.missing_pat()
580 }
581 }
582
583 fn parse_path(&mut self, path: ast::Path) -> Option<Path> {
584 let hygiene = Hygiene::new(self.db, self.current_file_id);
585 Path::from_src(path, &hygiene)
586 }
587}
6 588
7impl From<ast::BinOp> for BinaryOp { 589impl From<ast::BinOp> for BinaryOp {
8 fn from(ast_op: ast::BinOp) -> Self { 590 fn from(ast_op: ast::BinOp) -> Self {
diff --git a/crates/ra_hir_def/src/expr.rs b/crates/ra_hir_def/src/expr.rs
index 12eb0da68..04c1d8f69 100644
--- a/crates/ra_hir_def/src/expr.rs
+++ b/crates/ra_hir_def/src/expr.rs
@@ -9,6 +9,8 @@
9//! 3. Unresolved. Paths are stored as sequences of names, and not as defs the 9//! 3. Unresolved. Paths are stored as sequences of names, and not as defs the
10//! names refer to. 10//! names refer to.
11//! 4. Desugared. There's no `if let`. 11//! 4. Desugared. There's no `if let`.
12//!
13//! See also a neighboring `body` module.
12 14
13use hir_expand::name::Name; 15use hir_expand::name::Name;
14use ra_arena::{impl_arena_id, RawId}; 16use ra_arena::{impl_arena_id, RawId};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 23:10:00 +0000