diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs index abf4ae4023..9ac811232f 100644 --- a/crates/ra_hir/src/db.rs +++ b/crates/ra_hir/src/db.rs @@ -113,10 +113,10 @@ pub trait HirDatabase: DefDatabase + AstDatabase { #[salsa::invoke(crate::ty::generic_defaults_query)] fn generic_defaults(&self, def: GenericDef) -> Substs; - #[salsa::invoke(Body::body_with_source_map_query)] + #[salsa::invoke(crate::expr::body_with_source_map_query)] fn body_with_source_map(&self, def: DefWithBody) -> (Arc, Arc); - #[salsa::invoke(Body::body_query)] + #[salsa::invoke(crate::expr::body_query)] fn body(&self, def: DefWithBody) -> Arc; #[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 ddf6051118..82955fa558 100644 --- a/crates/ra_hir/src/expr.rs +++ b/crates/ra_hir/src/expr.rs @@ -1,112 +1,52 @@ //! FIXME: write short doc here -pub(crate) mod lower; pub(crate) mod scope; pub(crate) mod validation; -use std::{ops::Index, sync::Arc}; +use std::sync::Arc; -use ra_arena::{map::ArenaMap, Arena}; use ra_syntax::{ast, AstPtr}; -use rustc_hash::FxHashMap; -use crate::{db::HirDatabase, DefWithBody, Either, HasSource, Resolver, Source}; +use crate::{db::HirDatabase, DefWithBody, HasSource, Resolver}; pub use self::scope::ExprScopes; -pub use hir_def::expr::{ - ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp, MatchArm, - Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, UnaryOp, +pub use hir_def::{ + body::{Body, BodySourceMap, ExprPtr, ExprSource, PatPtr, PatSource}, + expr::{ + ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp, + MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, UnaryOp, + }, }; -/// The body of an item (function, const etc.). -#[derive(Debug, Eq, PartialEq)] -pub struct Body { - exprs: Arena, - pats: Arena, - /// The patterns for the function's parameters. While the parameter types are - /// part of the function signature, the patterns are not (they don't change - /// the external type of the function). - /// - /// If this `Body` is for the body of a constant, this will just be - /// empty. - params: Vec, - /// The `ExprId` of the actual body expression. - body_expr: ExprId, +pub(crate) fn body_with_source_map_query( + db: &impl HirDatabase, + def: DefWithBody, +) -> (Arc, Arc) { + let mut params = None; + + let (file_id, body) = match def { + DefWithBody::Function(f) => { + let src = f.source(db); + params = src.ast.param_list(); + (src.file_id, src.ast.body().map(ast::Expr::from)) + } + DefWithBody::Const(c) => { + let src = c.source(db); + (src.file_id, src.ast.body()) + } + DefWithBody::Static(s) => { + let src = s.source(db); + (src.file_id, src.ast.body()) + } + }; + let resolver = hir_def::body::MacroResolver::new(db, def.module(db).id); + let (body, source_map) = Body::new(db, resolver, file_id, params, body); + (Arc::new(body), Arc::new(source_map)) } -type ExprPtr = Either, AstPtr>; -type ExprSource = Source; - -type PatPtr = Either, AstPtr>; -type PatSource = Source; - -/// An item body together with the mapping from syntax nodes to HIR expression -/// IDs. This is needed to go from e.g. a position in a file to the HIR -/// expression containing it; but for type inference etc., we want to operate on -/// a structure that is agnostic to the actual positions of expressions in the -/// file, so that we don't recompute types whenever some whitespace is typed. -/// -/// One complication here is that, due to macro expansion, a single `Body` might -/// be spread across several files. So, for each ExprId and PatId, we record -/// both the HirFileId and the position inside the file. However, we only store -/// AST -> ExprId mapping for non-macro files, as it is not clear how to handle -/// this properly for macros. -#[derive(Default, Debug, Eq, PartialEq)] -pub struct BodySourceMap { - expr_map: FxHashMap, - expr_map_back: ArenaMap, - pat_map: FxHashMap, - pat_map_back: ArenaMap, - field_map: FxHashMap<(ExprId, usize), AstPtr>, -} - -impl Body { - pub(crate) fn body_with_source_map_query( - db: &impl HirDatabase, - def: DefWithBody, - ) -> (Arc, Arc) { - let mut params = None; - - let (file_id, body) = match def { - DefWithBody::Function(f) => { - let src = f.source(db); - params = src.ast.param_list(); - (src.file_id, src.ast.body().map(ast::Expr::from)) - } - DefWithBody::Const(c) => { - let src = c.source(db); - (src.file_id, src.ast.body()) - } - DefWithBody::Static(s) => { - let src = s.source(db); - (src.file_id, src.ast.body()) - } - }; - - let (body, source_map) = lower::lower(db, def.resolver(db), file_id, params, body); - (Arc::new(body), Arc::new(source_map)) - } - - pub(crate) fn body_query(db: &impl HirDatabase, def: DefWithBody) -> Arc { - db.body_with_source_map(def).0 - } - - pub fn params(&self) -> &[PatId] { - &self.params - } - - pub fn body_expr(&self) -> ExprId { - self.body_expr - } - - pub fn exprs(&self) -> impl Iterator { - self.exprs.iter() - } - - pub fn pats(&self) -> impl Iterator { - self.pats.iter() - } +pub(crate) fn body_query(db: &impl HirDatabase, def: DefWithBody) -> Arc { + db.body_with_source_map(def).0 } // needs arbitrary_self_types to be a method... or maybe move to the def? @@ -132,41 +72,3 @@ pub(crate) fn resolver_for_scope( } r } - -impl Index for Body { - type Output = Expr; - - fn index(&self, expr: ExprId) -> &Expr { - &self.exprs[expr] - } -} - -impl Index for Body { - type Output = Pat; - - fn index(&self, pat: PatId) -> &Pat { - &self.pats[pat] - } -} - -impl BodySourceMap { - pub(crate) fn expr_syntax(&self, expr: ExprId) -> Option { - self.expr_map_back.get(expr).copied() - } - - pub(crate) fn node_expr(&self, node: &ast::Expr) -> Option { - self.expr_map.get(&Either::A(AstPtr::new(node))).cloned() - } - - pub(crate) fn pat_syntax(&self, pat: PatId) -> Option { - self.pat_map_back.get(pat).copied() - } - - pub(crate) fn node_pat(&self, node: &ast::Pat) -> Option { - self.pat_map.get(&Either::A(AstPtr::new(node))).cloned() - } - - pub(crate) fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr { - self.field_map[&(expr, field)] - } -} diff --git a/crates/ra_hir/src/expr/lower.rs b/crates/ra_hir/src/expr/lower.rs deleted file mode 100644 index adc68b23c5..0000000000 --- a/crates/ra_hir/src/expr/lower.rs +++ /dev/null @@ -1,593 +0,0 @@ -//! FIXME: write short doc here - -use hir_def::{ - builtin_type::{BuiltinFloat, BuiltinInt}, - path::GenericArgs, - type_ref::TypeRef, -}; -use hir_expand::{ - hygiene::Hygiene, - name::{self, AsName, Name}, -}; -use ra_arena::Arena; -use ra_syntax::{ - ast::{ - self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner, - TypeAscriptionOwner, - }, - AstNode, AstPtr, -}; -use test_utils::tested_by; - -use crate::{ - db::HirDatabase, AstId, Either, HirFileId, MacroCallLoc, MacroFileKind, Mutability, Path, - Resolver, Source, -}; - -use super::{ - Array, BinaryOp, BindingAnnotation, Body, BodySourceMap, Expr, ExprId, Literal, MatchArm, Pat, - PatId, PatPtr, RecordFieldPat, RecordLitField, Statement, -}; - -pub(super) fn lower( - db: &impl HirDatabase, - resolver: Resolver, - file_id: HirFileId, - params: Option, - body: Option, -) -> (Body, BodySourceMap) { - ExprCollector { - resolver, - db, - original_file_id: file_id, - current_file_id: file_id, - source_map: BodySourceMap::default(), - body: Body { - exprs: Arena::default(), - pats: Arena::default(), - params: Vec::new(), - body_expr: ExprId::dummy(), - }, - } - .collect(params, body) -} - -struct ExprCollector { - db: DB, - resolver: Resolver, - // Expr collector expands macros along the way. original points to the file - // we started with, current points to the current macro expansion. source - // maps don't support macros yet, so we only record info into source map if - // current == original (see #1196) - original_file_id: HirFileId, - current_file_id: HirFileId, - - body: Body, - source_map: BodySourceMap, -} - -impl<'a, DB> ExprCollector<&'a DB> -where - DB: HirDatabase, -{ - fn collect( - mut self, - param_list: Option, - body: Option, - ) -> (Body, BodySourceMap) { - if let Some(param_list) = param_list { - if let Some(self_param) = param_list.self_param() { - let ptr = AstPtr::new(&self_param); - let param_pat = self.alloc_pat( - Pat::Bind { - name: name::SELF_PARAM, - mode: BindingAnnotation::Unannotated, - subpat: None, - }, - Either::B(ptr), - ); - self.body.params.push(param_pat); - } - - for param in param_list.params() { - let pat = match param.pat() { - None => continue, - Some(pat) => pat, - }; - let param_pat = self.collect_pat(pat); - self.body.params.push(param_pat); - } - }; - - self.body.body_expr = self.collect_expr_opt(body); - (self.body, self.source_map) - } - - fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr) -> ExprId { - let ptr = Either::A(ptr); - let id = self.body.exprs.alloc(expr); - if self.current_file_id == self.original_file_id { - self.source_map.expr_map.insert(ptr, id); - } - self.source_map - .expr_map_back - .insert(id, Source { file_id: self.current_file_id, ast: ptr }); - id - } - // desugared exprs don't have ptr, that's wrong and should be fixed - // somehow. - fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId { - self.body.exprs.alloc(expr) - } - fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr) -> ExprId { - let ptr = Either::B(ptr); - let id = self.body.exprs.alloc(expr); - if self.current_file_id == self.original_file_id { - self.source_map.expr_map.insert(ptr, id); - } - self.source_map - .expr_map_back - .insert(id, Source { file_id: self.current_file_id, ast: ptr }); - id - } - fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId { - let id = self.body.pats.alloc(pat); - if self.current_file_id == self.original_file_id { - self.source_map.pat_map.insert(ptr, id); - } - self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr }); - id - } - - fn empty_block(&mut self) -> ExprId { - let block = Expr::Block { statements: Vec::new(), tail: None }; - self.body.exprs.alloc(block) - } - - fn missing_expr(&mut self) -> ExprId { - self.body.exprs.alloc(Expr::Missing) - } - - fn missing_pat(&mut self) -> PatId { - self.body.pats.alloc(Pat::Missing) - } - - fn collect_expr(&mut self, expr: ast::Expr) -> ExprId { - let syntax_ptr = AstPtr::new(&expr); - match expr { - ast::Expr::IfExpr(e) => { - let then_branch = self.collect_block_opt(e.then_branch()); - - let else_branch = e.else_branch().map(|b| match b { - ast::ElseBranch::Block(it) => self.collect_block(it), - ast::ElseBranch::IfExpr(elif) => { - let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap(); - self.collect_expr(expr) - } - }); - - let condition = match e.condition() { - None => self.missing_expr(), - Some(condition) => match condition.pat() { - None => self.collect_expr_opt(condition.expr()), - // if let -- desugar to match - Some(pat) => { - let pat = self.collect_pat(pat); - let match_expr = self.collect_expr_opt(condition.expr()); - let placeholder_pat = self.missing_pat(); - let arms = vec![ - MatchArm { pats: vec![pat], expr: then_branch, guard: None }, - MatchArm { - pats: vec![placeholder_pat], - expr: else_branch.unwrap_or_else(|| self.empty_block()), - guard: None, - }, - ]; - return self - .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr); - } - }, - }; - - self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr) - } - ast::Expr::TryBlockExpr(e) => { - let body = self.collect_block_opt(e.body()); - self.alloc_expr(Expr::TryBlock { body }, syntax_ptr) - } - ast::Expr::BlockExpr(e) => self.collect_block(e), - ast::Expr::LoopExpr(e) => { - let body = self.collect_block_opt(e.loop_body()); - self.alloc_expr(Expr::Loop { body }, syntax_ptr) - } - ast::Expr::WhileExpr(e) => { - let body = self.collect_block_opt(e.loop_body()); - - let condition = match e.condition() { - None => self.missing_expr(), - Some(condition) => match condition.pat() { - None => self.collect_expr_opt(condition.expr()), - // if let -- desugar to match - Some(pat) => { - tested_by!(infer_while_let); - let pat = self.collect_pat(pat); - let match_expr = self.collect_expr_opt(condition.expr()); - let placeholder_pat = self.missing_pat(); - let break_ = self.alloc_expr_desugared(Expr::Break { expr: None }); - let arms = vec![ - MatchArm { pats: vec![pat], expr: body, guard: None }, - MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None }, - ]; - let match_expr = - self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms }); - return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr); - } - }, - }; - - self.alloc_expr(Expr::While { condition, body }, syntax_ptr) - } - ast::Expr::ForExpr(e) => { - let iterable = self.collect_expr_opt(e.iterable()); - let pat = self.collect_pat_opt(e.pat()); - let body = self.collect_block_opt(e.loop_body()); - self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr) - } - ast::Expr::CallExpr(e) => { - let callee = self.collect_expr_opt(e.expr()); - let args = if let Some(arg_list) = e.arg_list() { - arg_list.args().map(|e| self.collect_expr(e)).collect() - } else { - Vec::new() - }; - self.alloc_expr(Expr::Call { callee, args }, syntax_ptr) - } - ast::Expr::MethodCallExpr(e) => { - let receiver = self.collect_expr_opt(e.expr()); - let args = if let Some(arg_list) = e.arg_list() { - arg_list.args().map(|e| self.collect_expr(e)).collect() - } else { - Vec::new() - }; - let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing); - let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast); - self.alloc_expr( - Expr::MethodCall { receiver, method_name, args, generic_args }, - syntax_ptr, - ) - } - ast::Expr::MatchExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - let arms = if let Some(match_arm_list) = e.match_arm_list() { - match_arm_list - .arms() - .map(|arm| MatchArm { - pats: arm.pats().map(|p| self.collect_pat(p)).collect(), - expr: self.collect_expr_opt(arm.expr()), - guard: arm - .guard() - .and_then(|guard| guard.expr()) - .map(|e| self.collect_expr(e)), - }) - .collect() - } else { - Vec::new() - }; - self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr) - } - ast::Expr::PathExpr(e) => { - let path = e - .path() - .and_then(|path| self.parse_path(path)) - .map(Expr::Path) - .unwrap_or(Expr::Missing); - self.alloc_expr(path, syntax_ptr) - } - ast::Expr::ContinueExpr(_e) => { - // FIXME: labels - self.alloc_expr(Expr::Continue, syntax_ptr) - } - ast::Expr::BreakExpr(e) => { - let expr = e.expr().map(|e| self.collect_expr(e)); - self.alloc_expr(Expr::Break { expr }, syntax_ptr) - } - ast::Expr::ParenExpr(e) => { - let inner = self.collect_expr_opt(e.expr()); - // make the paren expr point to the inner expression as well - self.source_map.expr_map.insert(Either::A(syntax_ptr), inner); - inner - } - ast::Expr::ReturnExpr(e) => { - let expr = e.expr().map(|e| self.collect_expr(e)); - self.alloc_expr(Expr::Return { expr }, syntax_ptr) - } - ast::Expr::RecordLit(e) => { - let path = e.path().and_then(|path| self.parse_path(path)); - let mut field_ptrs = Vec::new(); - let record_lit = if let Some(nfl) = e.record_field_list() { - let fields = nfl - .fields() - .inspect(|field| field_ptrs.push(AstPtr::new(field))) - .map(|field| RecordLitField { - name: field - .name_ref() - .map(|nr| nr.as_name()) - .unwrap_or_else(Name::missing), - expr: if let Some(e) = field.expr() { - self.collect_expr(e) - } else if let Some(nr) = field.name_ref() { - // field shorthand - self.alloc_expr_field_shorthand( - Expr::Path(Path::from_name_ref(&nr)), - AstPtr::new(&field), - ) - } else { - self.missing_expr() - }, - }) - .collect(); - let spread = nfl.spread().map(|s| self.collect_expr(s)); - Expr::RecordLit { path, fields, spread } - } else { - Expr::RecordLit { path, fields: Vec::new(), spread: None } - }; - - let res = self.alloc_expr(record_lit, syntax_ptr); - for (i, ptr) in field_ptrs.into_iter().enumerate() { - self.source_map.field_map.insert((res, i), ptr); - } - res - } - ast::Expr::FieldExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - let name = match e.field_access() { - Some(kind) => kind.as_name(), - _ => Name::missing(), - }; - self.alloc_expr(Expr::Field { expr, name }, syntax_ptr) - } - ast::Expr::AwaitExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - self.alloc_expr(Expr::Await { expr }, syntax_ptr) - } - ast::Expr::TryExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - self.alloc_expr(Expr::Try { expr }, syntax_ptr) - } - ast::Expr::CastExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - let type_ref = TypeRef::from_ast_opt(e.type_ref()); - self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr) - } - ast::Expr::RefExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - let mutability = Mutability::from_mutable(e.is_mut()); - self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr) - } - ast::Expr::PrefixExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - if let Some(op) = e.op_kind() { - self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr) - } else { - self.alloc_expr(Expr::Missing, syntax_ptr) - } - } - ast::Expr::LambdaExpr(e) => { - let mut args = Vec::new(); - let mut arg_types = Vec::new(); - if let Some(pl) = e.param_list() { - for param in pl.params() { - let pat = self.collect_pat_opt(param.pat()); - let type_ref = param.ascribed_type().map(TypeRef::from_ast); - args.push(pat); - arg_types.push(type_ref); - } - } - let body = self.collect_expr_opt(e.body()); - self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr) - } - ast::Expr::BinExpr(e) => { - let lhs = self.collect_expr_opt(e.lhs()); - let rhs = self.collect_expr_opt(e.rhs()); - let op = e.op_kind().map(BinaryOp::from); - self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr) - } - ast::Expr::TupleExpr(e) => { - let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect(); - self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr) - } - ast::Expr::BoxExpr(e) => { - let expr = self.collect_expr_opt(e.expr()); - self.alloc_expr(Expr::Box { expr }, syntax_ptr) - } - - ast::Expr::ArrayExpr(e) => { - let kind = e.kind(); - - match kind { - ArrayExprKind::ElementList(e) => { - let exprs = e.map(|expr| self.collect_expr(expr)).collect(); - self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr) - } - ArrayExprKind::Repeat { initializer, repeat } => { - let initializer = self.collect_expr_opt(initializer); - let repeat = self.collect_expr_opt(repeat); - self.alloc_expr( - Expr::Array(Array::Repeat { initializer, repeat }), - syntax_ptr, - ) - } - } - } - - ast::Expr::Literal(e) => { - let lit = match e.kind() { - LiteralKind::IntNumber { suffix } => { - let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it)); - - Literal::Int(Default::default(), known_name) - } - LiteralKind::FloatNumber { suffix } => { - let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it)); - - Literal::Float(Default::default(), known_name) - } - LiteralKind::ByteString => Literal::ByteString(Default::default()), - LiteralKind::String => Literal::String(Default::default()), - LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)), - LiteralKind::Bool => Literal::Bool(Default::default()), - LiteralKind::Char => Literal::Char(Default::default()), - }; - self.alloc_expr(Expr::Literal(lit), syntax_ptr) - } - ast::Expr::IndexExpr(e) => { - let base = self.collect_expr_opt(e.base()); - let index = self.collect_expr_opt(e.index()); - self.alloc_expr(Expr::Index { base, index }, syntax_ptr) - } - - // FIXME implement HIR for these: - ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), - ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), - ast::Expr::MacroCall(e) => { - let ast_id = AstId::new( - self.current_file_id, - self.db.ast_id_map(self.current_file_id).ast_id(&e), - ); - - if let Some(path) = e.path().and_then(|path| self.parse_path(path)) { - if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) { - let call_id = self.db.intern_macro(MacroCallLoc { def: def.id, ast_id }); - let file_id = call_id.as_file(MacroFileKind::Expr); - if let Some(node) = self.db.parse_or_expand(file_id) { - if let Some(expr) = ast::Expr::cast(node) { - log::debug!("macro expansion {:#?}", expr.syntax()); - let old_file_id = - std::mem::replace(&mut self.current_file_id, file_id); - let id = self.collect_expr(expr); - self.current_file_id = old_file_id; - return id; - } - } - } - } - // FIXME: Instead of just dropping the error from expansion - // report it - self.alloc_expr(Expr::Missing, syntax_ptr) - } - } - } - - fn collect_expr_opt(&mut self, expr: Option) -> ExprId { - if let Some(expr) = expr { - self.collect_expr(expr) - } else { - self.missing_expr() - } - } - - fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId { - let syntax_node_ptr = AstPtr::new(&expr.clone().into()); - let block = match expr.block() { - Some(block) => block, - None => return self.alloc_expr(Expr::Missing, syntax_node_ptr), - }; - let statements = block - .statements() - .map(|s| match s { - ast::Stmt::LetStmt(stmt) => { - let pat = self.collect_pat_opt(stmt.pat()); - let type_ref = stmt.ascribed_type().map(TypeRef::from_ast); - let initializer = stmt.initializer().map(|e| self.collect_expr(e)); - Statement::Let { pat, type_ref, initializer } - } - ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())), - }) - .collect(); - let tail = block.expr().map(|e| self.collect_expr(e)); - self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr) - } - - fn collect_block_opt(&mut self, expr: Option) -> ExprId { - if let Some(block) = expr { - self.collect_block(block) - } else { - self.missing_expr() - } - } - - fn collect_pat(&mut self, pat: ast::Pat) -> PatId { - let pattern = match &pat { - ast::Pat::BindPat(bp) => { - let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing); - let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref()); - let subpat = bp.pat().map(|subpat| self.collect_pat(subpat)); - Pat::Bind { name, mode: annotation, subpat } - } - ast::Pat::TupleStructPat(p) => { - let path = p.path().and_then(|path| self.parse_path(path)); - let args = p.args().map(|p| self.collect_pat(p)).collect(); - Pat::TupleStruct { path, args } - } - ast::Pat::RefPat(p) => { - let pat = self.collect_pat_opt(p.pat()); - let mutability = Mutability::from_mutable(p.is_mut()); - Pat::Ref { pat, mutability } - } - ast::Pat::PathPat(p) => { - let path = p.path().and_then(|path| self.parse_path(path)); - path.map(Pat::Path).unwrap_or(Pat::Missing) - } - ast::Pat::TuplePat(p) => { - let args = p.args().map(|p| self.collect_pat(p)).collect(); - Pat::Tuple(args) - } - ast::Pat::PlaceholderPat(_) => Pat::Wild, - ast::Pat::RecordPat(p) => { - let path = p.path().and_then(|path| self.parse_path(path)); - let record_field_pat_list = - p.record_field_pat_list().expect("every struct should have a field list"); - let mut fields: Vec<_> = record_field_pat_list - .bind_pats() - .filter_map(|bind_pat| { - let ast_pat = - ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat"); - let pat = self.collect_pat(ast_pat); - let name = bind_pat.name()?.as_name(); - Some(RecordFieldPat { name, pat }) - }) - .collect(); - let iter = record_field_pat_list.record_field_pats().filter_map(|f| { - let ast_pat = f.pat()?; - let pat = self.collect_pat(ast_pat); - let name = f.name()?.as_name(); - Some(RecordFieldPat { name, pat }) - }); - fields.extend(iter); - - Pat::Record { path, args: fields } - } - - // FIXME: implement - ast::Pat::DotDotPat(_) => Pat::Missing, - ast::Pat::BoxPat(_) => Pat::Missing, - ast::Pat::LiteralPat(_) => Pat::Missing, - ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing, - }; - let ptr = AstPtr::new(&pat); - self.alloc_pat(pattern, Either::A(ptr)) - } - - fn collect_pat_opt(&mut self, pat: Option) -> PatId { - if let Some(pat) = pat { - self.collect_pat(pat) - } else { - self.missing_pat() - } - } - - fn parse_path(&mut self, path: ast::Path) -> Option { - let hygiene = Hygiene::new(self.db, self.current_file_id); - Path::from_src(path, &hygiene) - } -} diff --git a/crates/ra_hir/src/marks.rs b/crates/ra_hir/src/marks.rs index 0d4fa5b673..0f754eb9c7 100644 --- a/crates/ra_hir/src/marks.rs +++ b/crates/ra_hir/src/marks.rs @@ -5,6 +5,5 @@ test_utils::marks!( type_var_cycles_resolve_as_possible type_var_resolves_to_int_var match_ergonomics_ref - infer_while_let coerce_merge_fail_fallback ); diff --git a/crates/ra_hir/src/ty/tests.rs b/crates/ra_hir/src/ty/tests.rs index 896bf2924b..8863c36087 100644 --- a/crates/ra_hir/src/ty/tests.rs +++ b/crates/ra_hir/src/ty/tests.rs @@ -222,7 +222,6 @@ mod collections { #[test] fn infer_while_let() { - covers!(infer_while_let); let (db, pos) = TestDB::with_position( r#" //- /main.rs @@ -4825,7 +4824,7 @@ fn main() { @r###" ![0; 1) '6': i32 [64; 88) '{ ...!(); }': () - [74; 75) 'x': i32 + [74; 75) 'x': i32 "### ); } diff --git a/crates/ra_hir_def/src/body.rs b/crates/ra_hir_def/src/body.rs index 7447904ea6..ac8f8261b8 100644 --- a/crates/ra_hir_def/src/body.rs +++ b/crates/ra_hir_def/src/body.rs @@ -1,2 +1,144 @@ //! FIXME: write short doc here mod lower; + +use std::{ops::Index, sync::Arc}; + +use hir_expand::{either::Either, HirFileId, MacroDefId, Source}; +use ra_arena::{map::ArenaMap, Arena}; +use ra_syntax::{ast, AstPtr}; +use rustc_hash::FxHashMap; + +use crate::{ + db::DefDatabase2, + expr::{Expr, ExprId, Pat, PatId}, + nameres::CrateDefMap, + path::Path, + ModuleId, +}; + +pub struct MacroResolver { + crate_def_map: Arc, + module: ModuleId, +} + +impl MacroResolver { + pub fn new(db: &impl DefDatabase2, module: ModuleId) -> MacroResolver { + MacroResolver { crate_def_map: db.crate_def_map(module.krate), module } + } + + pub(crate) fn resolve_path_as_macro( + &self, + db: &impl DefDatabase2, + path: &Path, + ) -> Option { + self.crate_def_map.resolve_path(db, self.module.module_id, path).0.get_macros() + } +} + +/// The body of an item (function, const etc.). +#[derive(Debug, Eq, PartialEq)] +pub struct Body { + exprs: Arena, + pats: Arena, + /// The patterns for the function's parameters. While the parameter types are + /// part of the function signature, the patterns are not (they don't change + /// the external type of the function). + /// + /// If this `Body` is for the body of a constant, this will just be + /// empty. + params: Vec, + /// The `ExprId` of the actual body expression. + body_expr: ExprId, +} + +pub type ExprPtr = Either, AstPtr>; +pub type ExprSource = Source; + +pub type PatPtr = Either, AstPtr>; +pub type PatSource = Source; + +/// An item body together with the mapping from syntax nodes to HIR expression +/// IDs. This is needed to go from e.g. a position in a file to the HIR +/// expression containing it; but for type inference etc., we want to operate on +/// a structure that is agnostic to the actual positions of expressions in the +/// file, so that we don't recompute types whenever some whitespace is typed. +/// +/// One complication here is that, due to macro expansion, a single `Body` might +/// be spread across several files. So, for each ExprId and PatId, we record +/// both the HirFileId and the position inside the file. However, we only store +/// AST -> ExprId mapping for non-macro files, as it is not clear how to handle +/// this properly for macros. +#[derive(Default, Debug, Eq, PartialEq)] +pub struct BodySourceMap { + expr_map: FxHashMap, + expr_map_back: ArenaMap, + pat_map: FxHashMap, + pat_map_back: ArenaMap, + field_map: FxHashMap<(ExprId, usize), AstPtr>, +} + +impl Body { + pub fn new( + db: &impl DefDatabase2, + resolver: MacroResolver, + file_id: HirFileId, + params: Option, + body: Option, + ) -> (Body, BodySourceMap) { + lower::lower(db, resolver, file_id, params, body) + } + + pub fn params(&self) -> &[PatId] { + &self.params + } + + pub fn body_expr(&self) -> ExprId { + self.body_expr + } + + pub fn exprs(&self) -> impl Iterator { + self.exprs.iter() + } + + pub fn pats(&self) -> impl Iterator { + self.pats.iter() + } +} + +impl Index for Body { + type Output = Expr; + + fn index(&self, expr: ExprId) -> &Expr { + &self.exprs[expr] + } +} + +impl Index for Body { + type Output = Pat; + + fn index(&self, pat: PatId) -> &Pat { + &self.pats[pat] + } +} + +impl BodySourceMap { + pub fn expr_syntax(&self, expr: ExprId) -> Option { + self.expr_map_back.get(expr).copied() + } + + pub fn node_expr(&self, node: &ast::Expr) -> Option { + self.expr_map.get(&Either::A(AstPtr::new(node))).cloned() + } + + pub fn pat_syntax(&self, pat: PatId) -> Option { + self.pat_map_back.get(pat).copied() + } + + pub fn node_pat(&self, node: &ast::Pat) -> Option { + self.pat_map.get(&Either::A(AstPtr::new(node))).cloned() + } + + pub fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr { + self.field_map[&(expr, field)] + } +} diff --git a/crates/ra_hir_def/src/body/lower.rs b/crates/ra_hir_def/src/body/lower.rs index 1a144b1f91..1f93260d65 100644 --- a/crates/ra_hir_def/src/body/lower.rs +++ b/crates/ra_hir_def/src/body/lower.rs @@ -1,8 +1,594 @@ //! FIXME: write short doc here -use ra_syntax::ast; +use hir_expand::{ + either::Either, + hygiene::Hygiene, + name::{self, AsName, Name}, + AstId, HirFileId, MacroCallLoc, MacroFileKind, Source, +}; +use ra_arena::Arena; +use ra_syntax::{ + ast::{ + self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner, + TypeAscriptionOwner, + }, + AstNode, AstPtr, +}; -use crate::expr::{ArithOp, BinaryOp, CmpOp, LogicOp, Ordering}; +use crate::{ + body::{Body, BodySourceMap, MacroResolver, PatPtr}, + builtin_type::{BuiltinFloat, BuiltinInt}, + db::DefDatabase2, + expr::{ + ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp, + MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, + }, + path::GenericArgs, + path::Path, + type_ref::{Mutability, TypeRef}, +}; + +pub(super) fn lower( + db: &impl DefDatabase2, + resolver: MacroResolver, + file_id: HirFileId, + params: Option, + body: Option, +) -> (Body, BodySourceMap) { + ExprCollector { + resolver, + db, + original_file_id: file_id, + current_file_id: file_id, + source_map: BodySourceMap::default(), + body: Body { + exprs: Arena::default(), + pats: Arena::default(), + params: Vec::new(), + body_expr: ExprId::dummy(), + }, + } + .collect(params, body) +} + +struct ExprCollector { + db: DB, + resolver: MacroResolver, + // Expr collector expands macros along the way. original points to the file + // we started with, current points to the current macro expansion. source + // maps don't support macros yet, so we only record info into source map if + // current == original (see #1196) + original_file_id: HirFileId, + current_file_id: HirFileId, + + body: Body, + source_map: BodySourceMap, +} + +impl<'a, DB> ExprCollector<&'a DB> +where + DB: DefDatabase2, +{ + fn collect( + mut self, + param_list: Option, + body: Option, + ) -> (Body, BodySourceMap) { + if let Some(param_list) = param_list { + if let Some(self_param) = param_list.self_param() { + let ptr = AstPtr::new(&self_param); + let param_pat = self.alloc_pat( + Pat::Bind { + name: name::SELF_PARAM, + mode: BindingAnnotation::Unannotated, + subpat: None, + }, + Either::B(ptr), + ); + self.body.params.push(param_pat); + } + + for param in param_list.params() { + let pat = match param.pat() { + None => continue, + Some(pat) => pat, + }; + let param_pat = self.collect_pat(pat); + self.body.params.push(param_pat); + } + }; + + self.body.body_expr = self.collect_expr_opt(body); + (self.body, self.source_map) + } + + fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr) -> ExprId { + let ptr = Either::A(ptr); + let id = self.body.exprs.alloc(expr); + if self.current_file_id == self.original_file_id { + self.source_map.expr_map.insert(ptr, id); + } + self.source_map + .expr_map_back + .insert(id, Source { file_id: self.current_file_id, ast: ptr }); + id + } + // desugared exprs don't have ptr, that's wrong and should be fixed + // somehow. + fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId { + self.body.exprs.alloc(expr) + } + fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr) -> ExprId { + let ptr = Either::B(ptr); + let id = self.body.exprs.alloc(expr); + if self.current_file_id == self.original_file_id { + self.source_map.expr_map.insert(ptr, id); + } + self.source_map + .expr_map_back + .insert(id, Source { file_id: self.current_file_id, ast: ptr }); + id + } + fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId { + let id = self.body.pats.alloc(pat); + if self.current_file_id == self.original_file_id { + self.source_map.pat_map.insert(ptr, id); + } + self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr }); + id + } + + fn empty_block(&mut self) -> ExprId { + let block = Expr::Block { statements: Vec::new(), tail: None }; + self.body.exprs.alloc(block) + } + + fn missing_expr(&mut self) -> ExprId { + self.body.exprs.alloc(Expr::Missing) + } + + fn missing_pat(&mut self) -> PatId { + self.body.pats.alloc(Pat::Missing) + } + + fn collect_expr(&mut self, expr: ast::Expr) -> ExprId { + let syntax_ptr = AstPtr::new(&expr); + match expr { + ast::Expr::IfExpr(e) => { + let then_branch = self.collect_block_opt(e.then_branch()); + + let else_branch = e.else_branch().map(|b| match b { + ast::ElseBranch::Block(it) => self.collect_block(it), + ast::ElseBranch::IfExpr(elif) => { + let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap(); + self.collect_expr(expr) + } + }); + + let condition = match e.condition() { + None => self.missing_expr(), + Some(condition) => match condition.pat() { + None => self.collect_expr_opt(condition.expr()), + // if let -- desugar to match + Some(pat) => { + let pat = self.collect_pat(pat); + let match_expr = self.collect_expr_opt(condition.expr()); + let placeholder_pat = self.missing_pat(); + let arms = vec![ + MatchArm { pats: vec![pat], expr: then_branch, guard: None }, + MatchArm { + pats: vec![placeholder_pat], + expr: else_branch.unwrap_or_else(|| self.empty_block()), + guard: None, + }, + ]; + return self + .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr); + } + }, + }; + + self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr) + } + ast::Expr::TryBlockExpr(e) => { + let body = self.collect_block_opt(e.body()); + self.alloc_expr(Expr::TryBlock { body }, syntax_ptr) + } + ast::Expr::BlockExpr(e) => self.collect_block(e), + ast::Expr::LoopExpr(e) => { + let body = self.collect_block_opt(e.loop_body()); + self.alloc_expr(Expr::Loop { body }, syntax_ptr) + } + ast::Expr::WhileExpr(e) => { + let body = self.collect_block_opt(e.loop_body()); + + let condition = match e.condition() { + None => self.missing_expr(), + Some(condition) => match condition.pat() { + None => self.collect_expr_opt(condition.expr()), + // if let -- desugar to match + Some(pat) => { + let pat = self.collect_pat(pat); + let match_expr = self.collect_expr_opt(condition.expr()); + let placeholder_pat = self.missing_pat(); + let break_ = self.alloc_expr_desugared(Expr::Break { expr: None }); + let arms = vec![ + MatchArm { pats: vec![pat], expr: body, guard: None }, + MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None }, + ]; + let match_expr = + self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms }); + return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr); + } + }, + }; + + self.alloc_expr(Expr::While { condition, body }, syntax_ptr) + } + ast::Expr::ForExpr(e) => { + let iterable = self.collect_expr_opt(e.iterable()); + let pat = self.collect_pat_opt(e.pat()); + let body = self.collect_block_opt(e.loop_body()); + self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr) + } + ast::Expr::CallExpr(e) => { + let callee = self.collect_expr_opt(e.expr()); + let args = if let Some(arg_list) = e.arg_list() { + arg_list.args().map(|e| self.collect_expr(e)).collect() + } else { + Vec::new() + }; + self.alloc_expr(Expr::Call { callee, args }, syntax_ptr) + } + ast::Expr::MethodCallExpr(e) => { + let receiver = self.collect_expr_opt(e.expr()); + let args = if let Some(arg_list) = e.arg_list() { + arg_list.args().map(|e| self.collect_expr(e)).collect() + } else { + Vec::new() + }; + let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing); + let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast); + self.alloc_expr( + Expr::MethodCall { receiver, method_name, args, generic_args }, + syntax_ptr, + ) + } + ast::Expr::MatchExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + let arms = if let Some(match_arm_list) = e.match_arm_list() { + match_arm_list + .arms() + .map(|arm| MatchArm { + pats: arm.pats().map(|p| self.collect_pat(p)).collect(), + expr: self.collect_expr_opt(arm.expr()), + guard: arm + .guard() + .and_then(|guard| guard.expr()) + .map(|e| self.collect_expr(e)), + }) + .collect() + } else { + Vec::new() + }; + self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr) + } + ast::Expr::PathExpr(e) => { + let path = e + .path() + .and_then(|path| self.parse_path(path)) + .map(Expr::Path) + .unwrap_or(Expr::Missing); + self.alloc_expr(path, syntax_ptr) + } + ast::Expr::ContinueExpr(_e) => { + // FIXME: labels + self.alloc_expr(Expr::Continue, syntax_ptr) + } + ast::Expr::BreakExpr(e) => { + let expr = e.expr().map(|e| self.collect_expr(e)); + self.alloc_expr(Expr::Break { expr }, syntax_ptr) + } + ast::Expr::ParenExpr(e) => { + let inner = self.collect_expr_opt(e.expr()); + // make the paren expr point to the inner expression as well + self.source_map.expr_map.insert(Either::A(syntax_ptr), inner); + inner + } + ast::Expr::ReturnExpr(e) => { + let expr = e.expr().map(|e| self.collect_expr(e)); + self.alloc_expr(Expr::Return { expr }, syntax_ptr) + } + ast::Expr::RecordLit(e) => { + let path = e.path().and_then(|path| self.parse_path(path)); + let mut field_ptrs = Vec::new(); + let record_lit = if let Some(nfl) = e.record_field_list() { + let fields = nfl + .fields() + .inspect(|field| field_ptrs.push(AstPtr::new(field))) + .map(|field| RecordLitField { + name: field + .name_ref() + .map(|nr| nr.as_name()) + .unwrap_or_else(Name::missing), + expr: if let Some(e) = field.expr() { + self.collect_expr(e) + } else if let Some(nr) = field.name_ref() { + // field shorthand + self.alloc_expr_field_shorthand( + Expr::Path(Path::from_name_ref(&nr)), + AstPtr::new(&field), + ) + } else { + self.missing_expr() + }, + }) + .collect(); + let spread = nfl.spread().map(|s| self.collect_expr(s)); + Expr::RecordLit { path, fields, spread } + } else { + Expr::RecordLit { path, fields: Vec::new(), spread: None } + }; + + let res = self.alloc_expr(record_lit, syntax_ptr); + for (i, ptr) in field_ptrs.into_iter().enumerate() { + self.source_map.field_map.insert((res, i), ptr); + } + res + } + ast::Expr::FieldExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + let name = match e.field_access() { + Some(kind) => kind.as_name(), + _ => Name::missing(), + }; + self.alloc_expr(Expr::Field { expr, name }, syntax_ptr) + } + ast::Expr::AwaitExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + self.alloc_expr(Expr::Await { expr }, syntax_ptr) + } + ast::Expr::TryExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + self.alloc_expr(Expr::Try { expr }, syntax_ptr) + } + ast::Expr::CastExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + let type_ref = TypeRef::from_ast_opt(e.type_ref()); + self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr) + } + ast::Expr::RefExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + let mutability = Mutability::from_mutable(e.is_mut()); + self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr) + } + ast::Expr::PrefixExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + if let Some(op) = e.op_kind() { + self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr) + } else { + self.alloc_expr(Expr::Missing, syntax_ptr) + } + } + ast::Expr::LambdaExpr(e) => { + let mut args = Vec::new(); + let mut arg_types = Vec::new(); + if let Some(pl) = e.param_list() { + for param in pl.params() { + let pat = self.collect_pat_opt(param.pat()); + let type_ref = param.ascribed_type().map(TypeRef::from_ast); + args.push(pat); + arg_types.push(type_ref); + } + } + let body = self.collect_expr_opt(e.body()); + self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr) + } + ast::Expr::BinExpr(e) => { + let lhs = self.collect_expr_opt(e.lhs()); + let rhs = self.collect_expr_opt(e.rhs()); + let op = e.op_kind().map(BinaryOp::from); + self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr) + } + ast::Expr::TupleExpr(e) => { + let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect(); + self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr) + } + ast::Expr::BoxExpr(e) => { + let expr = self.collect_expr_opt(e.expr()); + self.alloc_expr(Expr::Box { expr }, syntax_ptr) + } + + ast::Expr::ArrayExpr(e) => { + let kind = e.kind(); + + match kind { + ArrayExprKind::ElementList(e) => { + let exprs = e.map(|expr| self.collect_expr(expr)).collect(); + self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr) + } + ArrayExprKind::Repeat { initializer, repeat } => { + let initializer = self.collect_expr_opt(initializer); + let repeat = self.collect_expr_opt(repeat); + self.alloc_expr( + Expr::Array(Array::Repeat { initializer, repeat }), + syntax_ptr, + ) + } + } + } + + ast::Expr::Literal(e) => { + let lit = match e.kind() { + LiteralKind::IntNumber { suffix } => { + let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it)); + + Literal::Int(Default::default(), known_name) + } + LiteralKind::FloatNumber { suffix } => { + let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it)); + + Literal::Float(Default::default(), known_name) + } + LiteralKind::ByteString => Literal::ByteString(Default::default()), + LiteralKind::String => Literal::String(Default::default()), + LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)), + LiteralKind::Bool => Literal::Bool(Default::default()), + LiteralKind::Char => Literal::Char(Default::default()), + }; + self.alloc_expr(Expr::Literal(lit), syntax_ptr) + } + ast::Expr::IndexExpr(e) => { + let base = self.collect_expr_opt(e.base()); + let index = self.collect_expr_opt(e.index()); + self.alloc_expr(Expr::Index { base, index }, syntax_ptr) + } + + // FIXME implement HIR for these: + ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), + ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), + ast::Expr::MacroCall(e) => { + let ast_id = AstId::new( + self.current_file_id, + self.db.ast_id_map(self.current_file_id).ast_id(&e), + ); + + if let Some(path) = e.path().and_then(|path| self.parse_path(path)) { + if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) { + let call_id = self.db.intern_macro(MacroCallLoc { def, ast_id }); + let file_id = call_id.as_file(MacroFileKind::Expr); + if let Some(node) = self.db.parse_or_expand(file_id) { + if let Some(expr) = ast::Expr::cast(node) { + log::debug!("macro expansion {:#?}", expr.syntax()); + let old_file_id = + std::mem::replace(&mut self.current_file_id, file_id); + let id = self.collect_expr(expr); + self.current_file_id = old_file_id; + return id; + } + } + } + } + // FIXME: Instead of just dropping the error from expansion + // report it + self.alloc_expr(Expr::Missing, syntax_ptr) + } + } + } + + fn collect_expr_opt(&mut self, expr: Option) -> ExprId { + if let Some(expr) = expr { + self.collect_expr(expr) + } else { + self.missing_expr() + } + } + + fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId { + let syntax_node_ptr = AstPtr::new(&expr.clone().into()); + let block = match expr.block() { + Some(block) => block, + None => return self.alloc_expr(Expr::Missing, syntax_node_ptr), + }; + let statements = block + .statements() + .map(|s| match s { + ast::Stmt::LetStmt(stmt) => { + let pat = self.collect_pat_opt(stmt.pat()); + let type_ref = stmt.ascribed_type().map(TypeRef::from_ast); + let initializer = stmt.initializer().map(|e| self.collect_expr(e)); + Statement::Let { pat, type_ref, initializer } + } + ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())), + }) + .collect(); + let tail = block.expr().map(|e| self.collect_expr(e)); + self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr) + } + + fn collect_block_opt(&mut self, expr: Option) -> ExprId { + if let Some(block) = expr { + self.collect_block(block) + } else { + self.missing_expr() + } + } + + fn collect_pat(&mut self, pat: ast::Pat) -> PatId { + let pattern = match &pat { + ast::Pat::BindPat(bp) => { + let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing); + let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref()); + let subpat = bp.pat().map(|subpat| self.collect_pat(subpat)); + Pat::Bind { name, mode: annotation, subpat } + } + ast::Pat::TupleStructPat(p) => { + let path = p.path().and_then(|path| self.parse_path(path)); + let args = p.args().map(|p| self.collect_pat(p)).collect(); + Pat::TupleStruct { path, args } + } + ast::Pat::RefPat(p) => { + let pat = self.collect_pat_opt(p.pat()); + let mutability = Mutability::from_mutable(p.is_mut()); + Pat::Ref { pat, mutability } + } + ast::Pat::PathPat(p) => { + let path = p.path().and_then(|path| self.parse_path(path)); + path.map(Pat::Path).unwrap_or(Pat::Missing) + } + ast::Pat::TuplePat(p) => { + let args = p.args().map(|p| self.collect_pat(p)).collect(); + Pat::Tuple(args) + } + ast::Pat::PlaceholderPat(_) => Pat::Wild, + ast::Pat::RecordPat(p) => { + let path = p.path().and_then(|path| self.parse_path(path)); + let record_field_pat_list = + p.record_field_pat_list().expect("every struct should have a field list"); + let mut fields: Vec<_> = record_field_pat_list + .bind_pats() + .filter_map(|bind_pat| { + let ast_pat = + ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat"); + let pat = self.collect_pat(ast_pat); + let name = bind_pat.name()?.as_name(); + Some(RecordFieldPat { name, pat }) + }) + .collect(); + let iter = record_field_pat_list.record_field_pats().filter_map(|f| { + let ast_pat = f.pat()?; + let pat = self.collect_pat(ast_pat); + let name = f.name()?.as_name(); + Some(RecordFieldPat { name, pat }) + }); + fields.extend(iter); + + Pat::Record { path, args: fields } + } + + // FIXME: implement + ast::Pat::DotDotPat(_) => Pat::Missing, + ast::Pat::BoxPat(_) => Pat::Missing, + ast::Pat::LiteralPat(_) => Pat::Missing, + ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing, + }; + let ptr = AstPtr::new(&pat); + self.alloc_pat(pattern, Either::A(ptr)) + } + + fn collect_pat_opt(&mut self, pat: Option) -> PatId { + if let Some(pat) = pat { + self.collect_pat(pat) + } else { + self.missing_pat() + } + } + + fn parse_path(&mut self, path: ast::Path) -> Option { + let hygiene = Hygiene::new(self.db, self.current_file_id); + Path::from_src(path, &hygiene) + } +} impl From for BinaryOp { fn from(ast_op: ast::BinOp) -> Self {