use std::ops::Index; use std::sync::Arc; use rustc_hash::FxHashMap; use ra_arena::{Arena, RawId, impl_arena_id, map::ArenaMap}; use ra_syntax::{ SyntaxNodePtr, AstPtr, AstNode, ast::{self, LoopBodyOwner, ArgListOwner, NameOwner, LiteralKind,ArrayExprKind, TypeAscriptionOwner}, }; use crate::{ Path, Name, HirDatabase, Resolver,DefWithBody, Either, HirFileId, MacroCallLoc, MacroFileKind, name::AsName, type_ref::{Mutability, TypeRef}, }; use crate::{path::GenericArgs, ty::primitive::{IntTy, UncertainIntTy, FloatTy, UncertainFloatTy}}; pub use self::scope::ExprScopes; pub(crate) mod scope; pub(crate) mod validation; #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] pub struct ExprId(RawId); impl_arena_id!(ExprId); /// The body of an item (function, const etc.). #[derive(Debug, Eq, PartialEq)] pub struct Body { /// The def of the item this body belongs to owner: DefWithBody, 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, } /// 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. #[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>, } type PatPtr = Either, AstPtr>; impl Body { pub fn params(&self) -> &[PatId] { &self.params } pub fn body_expr(&self) -> ExprId { self.body_expr } pub fn owner(&self) -> DefWithBody { self.owner } pub fn exprs(&self) -> impl Iterator { self.exprs.iter() } pub fn pats(&self) -> impl Iterator { self.pats.iter() } } // needs arbitrary_self_types to be a method... or maybe move to the def? pub(crate) fn resolver_for_expr( body: Arc, db: &impl HirDatabase, expr_id: ExprId, ) -> Resolver { let scopes = db.expr_scopes(body.owner); resolver_for_scope(body, db, scopes.scope_for(expr_id)) } pub(crate) fn resolver_for_scope( body: Arc, db: &impl HirDatabase, scope_id: Option, ) -> Resolver { let mut r = body.owner.resolver(db); let scopes = db.expr_scopes(body.owner); let scope_chain = scopes.scope_chain(scope_id).collect::>(); for scope in scope_chain.into_iter().rev() { r = r.push_expr_scope(Arc::clone(&scopes), 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).cloned() } pub(crate) fn syntax_expr(&self, ptr: SyntaxNodePtr) -> Option { self.expr_map.get(&ptr).cloned() } pub(crate) fn node_expr(&self, node: &ast::Expr) -> Option { self.expr_map.get(&SyntaxNodePtr::new(node.syntax())).cloned() } pub(crate) fn pat_syntax(&self, pat: PatId) -> Option { self.pat_map_back.get(pat).cloned() } 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)].clone() } } #[derive(Debug, Clone, Eq, PartialEq)] pub enum Literal { String(String), ByteString(Vec), Char(char), Bool(bool), Int(u64, UncertainIntTy), Float(u64, UncertainFloatTy), // FIXME: f64 is not Eq } #[derive(Debug, Clone, Eq, PartialEq)] pub enum Expr { /// This is produced if syntax tree does not have a required expression piece. Missing, Path(Path), If { condition: ExprId, then_branch: ExprId, else_branch: Option, }, Block { statements: Vec, tail: Option, }, Loop { body: ExprId, }, While { condition: ExprId, body: ExprId, }, For { iterable: ExprId, pat: PatId, body: ExprId, }, Call { callee: ExprId, args: Vec, }, MethodCall { receiver: ExprId, method_name: Name, args: Vec, generic_args: Option, }, Match { expr: ExprId, arms: Vec, }, Continue, Break { expr: Option, }, Return { expr: Option, }, StructLit { path: Option, fields: Vec, spread: Option, }, Field { expr: ExprId, name: Name, }, Try { expr: ExprId, }, Cast { expr: ExprId, type_ref: TypeRef, }, Ref { expr: ExprId, mutability: Mutability, }, UnaryOp { expr: ExprId, op: UnaryOp, }, BinaryOp { lhs: ExprId, rhs: ExprId, op: Option, }, Lambda { args: Vec, arg_types: Vec>, body: ExprId, }, Tuple { exprs: Vec, }, Array(Array), Literal(Literal), } pub use ra_syntax::ast::PrefixOp as UnaryOp; pub use ra_syntax::ast::BinOp as BinaryOp; #[derive(Debug, Clone, Eq, PartialEq)] pub enum Array { ElementList(Vec), Repeat { initializer: ExprId, repeat: ExprId }, } #[derive(Debug, Clone, Eq, PartialEq)] pub struct MatchArm { pub pats: Vec, pub guard: Option, pub expr: ExprId, } #[derive(Debug, Clone, Eq, PartialEq)] pub struct StructLitField { pub name: Name, pub expr: ExprId, } #[derive(Debug, Clone, Eq, PartialEq)] pub enum Statement { Let { pat: PatId, type_ref: Option, initializer: Option }, Expr(ExprId), } impl Expr { pub fn walk_child_exprs(&self, mut f: impl FnMut(ExprId)) { match self { Expr::Missing => {} Expr::Path(_) => {} Expr::If { condition, then_branch, else_branch } => { f(*condition); f(*then_branch); if let Some(else_branch) = else_branch { f(*else_branch); } } Expr::Block { statements, tail } => { for stmt in statements { match stmt { Statement::Let { initializer, .. } => { if let Some(expr) = initializer { f(*expr); } } Statement::Expr(e) => f(*e), } } if let Some(expr) = tail { f(*expr); } } Expr::Loop { body } => f(*body), Expr::While { condition, body } => { f(*condition); f(*body); } Expr::For { iterable, body, .. } => { f(*iterable); f(*body); } Expr::Call { callee, args } => { f(*callee); for arg in args { f(*arg); } } Expr::MethodCall { receiver, args, .. } => { f(*receiver); for arg in args { f(*arg); } } Expr::Match { expr, arms } => { f(*expr); for arm in arms { f(arm.expr); } } Expr::Continue => {} Expr::Break { expr } | Expr::Return { expr } => { if let Some(expr) = expr { f(*expr); } } Expr::StructLit { fields, spread, .. } => { for field in fields { f(field.expr); } if let Some(expr) = spread { f(*expr); } } Expr::Lambda { body, .. } => { f(*body); } Expr::BinaryOp { lhs, rhs, .. } => { f(*lhs); f(*rhs); } Expr::Field { expr, .. } | Expr::Try { expr } | Expr::Cast { expr, .. } | Expr::Ref { expr, .. } | Expr::UnaryOp { expr, .. } => { f(*expr); } Expr::Tuple { exprs } => { for expr in exprs { f(*expr); } } Expr::Array(a) => match a { Array::ElementList(exprs) => { for expr in exprs { f(*expr); } } Array::Repeat { initializer, repeat } => { f(*initializer); f(*repeat) } }, Expr::Literal(_) => {} } } } #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] pub struct PatId(RawId); impl_arena_id!(PatId); /// Explicit binding annotations given in the HIR for a binding. Note /// that this is not the final binding *mode* that we infer after type /// inference. #[derive(Clone, PartialEq, Eq, Debug, Copy)] pub enum BindingAnnotation { /// No binding annotation given: this means that the final binding mode /// will depend on whether we have skipped through a `&` reference /// when matching. For example, the `x` in `Some(x)` will have binding /// mode `None`; if you do `let Some(x) = &Some(22)`, it will /// ultimately be inferred to be by-reference. Unannotated, /// Annotated with `mut x` -- could be either ref or not, similar to `None`. Mutable, /// Annotated as `ref`, like `ref x` Ref, /// Annotated as `ref mut x`. RefMut, } impl BindingAnnotation { fn new(is_mutable: bool, is_ref: bool) -> Self { match (is_mutable, is_ref) { (true, true) => BindingAnnotation::RefMut, (false, true) => BindingAnnotation::Ref, (true, false) => BindingAnnotation::Mutable, (false, false) => BindingAnnotation::Unannotated, } } } #[derive(Debug, Clone, Eq, PartialEq)] pub struct FieldPat { pub(crate) name: Name, pub(crate) pat: PatId, } /// Close relative to rustc's hir::PatKind #[derive(Debug, Clone, Eq, PartialEq)] pub enum Pat { Missing, Wild, Tuple(Vec), Struct { path: Option, args: Vec, // FIXME: 'ellipsis' option }, Range { start: ExprId, end: ExprId, }, Slice { prefix: Vec, rest: Option, suffix: Vec, }, Path(Path), Lit(ExprId), Bind { mode: BindingAnnotation, name: Name, subpat: Option, }, TupleStruct { path: Option, args: Vec, }, Ref { pat: PatId, mutability: Mutability, }, } impl Pat { pub fn walk_child_pats(&self, mut f: impl FnMut(PatId)) { match self { Pat::Range { .. } | Pat::Lit(..) | Pat::Path(..) | Pat::Wild | Pat::Missing => {} Pat::Bind { subpat, .. } => { subpat.iter().map(|pat| *pat).for_each(f); } Pat::Tuple(args) | Pat::TupleStruct { args, .. } => { args.iter().map(|pat| *pat).for_each(f); } Pat::Ref { pat, .. } => f(*pat), Pat::Slice { prefix, rest, suffix } => { let total_iter = prefix.iter().chain(rest.iter()).chain(suffix.iter()); total_iter.map(|pat| *pat).for_each(f); } Pat::Struct { args, .. } => { args.iter().map(|f| f.pat).for_each(f); } } } } // Queries pub(crate) struct ExprCollector { db: DB, owner: DefWithBody, exprs: Arena, pats: Arena, source_map: BodySourceMap, params: Vec, body_expr: Option, 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, } impl<'a, DB> ExprCollector<&'a DB> where DB: HirDatabase, { fn new(owner: DefWithBody, file_id: HirFileId, resolver: Resolver, db: &'a DB) -> Self { ExprCollector { owner, resolver, db, exprs: Arena::default(), pats: Arena::default(), source_map: BodySourceMap::default(), params: Vec::new(), body_expr: None, original_file_id: file_id, current_file_id: file_id, } } fn alloc_expr(&mut self, expr: Expr, syntax_ptr: SyntaxNodePtr) -> ExprId { let id = self.exprs.alloc(expr); if self.current_file_id == self.original_file_id { self.source_map.expr_map.insert(syntax_ptr, id); self.source_map.expr_map_back.insert(id, syntax_ptr); } id } fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId { let id = self.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, ptr); } id } fn empty_block(&mut self) -> ExprId { let block = Expr::Block { statements: Vec::new(), tail: None }; self.exprs.alloc(block) } fn collect_expr(&mut self, expr: &ast::Expr) -> ExprId { let syntax_ptr = SyntaxNodePtr::new(expr.syntax()); match expr.kind() { ast::ExprKind::IfExpr(e) => { if let Some(pat) = e.condition().and_then(|c| c.pat()) { // if let -- desugar to match let pat = self.collect_pat(pat); let match_expr = self.collect_expr_opt(e.condition().expect("checked above").expr()); 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()).unwrap(); self.collect_expr(expr) } }) .unwrap_or_else(|| self.empty_block()); let placeholder_pat = self.pats.alloc(Pat::Missing); let arms = vec![ MatchArm { pats: vec![pat], expr: then_branch, guard: None }, MatchArm { pats: vec![placeholder_pat], expr: else_branch, guard: None }, ]; self.alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr) } else { let condition = self.collect_expr_opt(e.condition().and_then(|c| c.expr())); 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()).unwrap(); self.collect_expr(expr) } }); self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr) } } ast::ExprKind::BlockExpr(e) => self.collect_block_opt(e.block()), ast::ExprKind::LoopExpr(e) => { let body = self.collect_block_opt(e.loop_body()); self.alloc_expr(Expr::Loop { body }, syntax_ptr) } ast::ExprKind::WhileExpr(e) => { let condition = if let Some(condition) = e.condition() { if condition.pat().is_none() { self.collect_expr_opt(condition.expr()) } else { // FIXME handle while let return self.alloc_expr(Expr::Missing, syntax_ptr); } } else { self.exprs.alloc(Expr::Missing) }; let body = self.collect_block_opt(e.loop_body()); self.alloc_expr(Expr::While { condition, body }, syntax_ptr) } ast::ExprKind::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::ExprKind::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::ExprKind::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::ExprKind::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::ExprKind::PathExpr(e) => { let path = e.path().and_then(Path::from_ast).map(Expr::Path).unwrap_or(Expr::Missing); self.alloc_expr(path, syntax_ptr) } ast::ExprKind::ContinueExpr(_e) => { // FIXME: labels self.alloc_expr(Expr::Continue, syntax_ptr) } ast::ExprKind::BreakExpr(e) => { let expr = e.expr().map(|e| self.collect_expr(e)); self.alloc_expr(Expr::Break { expr }, syntax_ptr) } ast::ExprKind::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(syntax_ptr, inner); inner } ast::ExprKind::ReturnExpr(e) => { let expr = e.expr().map(|e| self.collect_expr(e)); self.alloc_expr(Expr::Return { expr }, syntax_ptr) } ast::ExprKind::StructLit(e) => { let path = e.path().and_then(Path::from_ast); let mut field_ptrs = Vec::new(); let struct_lit = if let Some(nfl) = e.named_field_list() { let fields = nfl .fields() .inspect(|field| field_ptrs.push(AstPtr::new(*field))) .map(|field| StructLitField { 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 let id = self.exprs.alloc(Expr::Path(Path::from_name_ref(nr))); self.source_map .expr_map .insert(SyntaxNodePtr::new(nr.syntax()), id); self.source_map .expr_map_back .insert(id, SyntaxNodePtr::new(nr.syntax())); id } else { self.exprs.alloc(Expr::Missing) }, }) .collect(); let spread = nfl.spread().map(|s| self.collect_expr(s)); Expr::StructLit { path, fields, spread } } else { Expr::StructLit { path, fields: Vec::new(), spread: None } }; let res = self.alloc_expr(struct_lit, syntax_ptr); for (i, ptr) in field_ptrs.into_iter().enumerate() { self.source_map.field_map.insert((res, i), ptr); } res } ast::ExprKind::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::ExprKind::TryExpr(e) => { let expr = self.collect_expr_opt(e.expr()); self.alloc_expr(Expr::Try { expr }, syntax_ptr) } ast::ExprKind::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::ExprKind::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::ExprKind::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::ExprKind::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::ExprKind::BinExpr(e) => { let lhs = self.collect_expr_opt(e.lhs()); let rhs = self.collect_expr_opt(e.rhs()); let op = e.op_kind(); self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr) } ast::ExprKind::TupleExpr(e) => { let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect(); self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr) } ast::ExprKind::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::ExprKind::Literal(e) => { let lit = match e.kind() { LiteralKind::IntNumber { suffix } => { let known_name = suffix .and_then(|it| IntTy::from_suffix(&it).map(UncertainIntTy::Known)); Literal::Int( Default::default(), known_name.unwrap_or(UncertainIntTy::Unknown), ) } LiteralKind::FloatNumber { suffix } => { let known_name = suffix .and_then(|it| FloatTy::from_suffix(&it).map(UncertainFloatTy::Known)); Literal::Float( Default::default(), known_name.unwrap_or(UncertainFloatTy::Unknown), ) } LiteralKind::ByteString => Literal::ByteString(Default::default()), LiteralKind::String => Literal::String(Default::default()), LiteralKind::Byte => { Literal::Int(Default::default(), UncertainIntTy::Known(IntTy::u8())) } LiteralKind::Bool => Literal::Bool(Default::default()), LiteralKind::Char => Literal::Char(Default::default()), }; self.alloc_expr(Expr::Literal(lit), syntax_ptr) } // FIXME implement HIR for these: ast::ExprKind::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), ast::ExprKind::IndexExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), ast::ExprKind::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr), ast::ExprKind::MacroCall(e) => { // very hacky.FIXME change to use the macro resolution let path = e.path().and_then(Path::from_ast); let ast_id = self .db .ast_id_map(self.current_file_id) .ast_id(e) .with_file_id(self.current_file_id); if let Some(def) = self.resolver.resolve_macro_call(path) { let call_id = MacroCallLoc { def, ast_id }.id(self.db); 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().debug_dump()); 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<&ast::Expr>) -> ExprId { if let Some(expr) = expr { self.collect_expr(expr) } else { self.exprs.alloc(Expr::Missing) } } fn collect_block(&mut self, block: &ast::Block) -> ExprId { let statements = block .statements() .map(|s| match s.kind() { ast::StmtKind::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::StmtKind::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 }, SyntaxNodePtr::new(block.syntax())) } fn collect_block_opt(&mut self, block: Option<&ast::Block>) -> ExprId { if let Some(block) = block { self.collect_block(block) } else { self.exprs.alloc(Expr::Missing) } } fn collect_pat(&mut self, pat: &ast::Pat) -> PatId { let pattern = match pat.kind() { ast::PatKind::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::PatKind::TupleStructPat(p) => { let path = p.path().and_then(Path::from_ast); let args = p.args().map(|p| self.collect_pat(p)).collect(); Pat::TupleStruct { path, args } } ast::PatKind::RefPat(p) => { let pat = self.collect_pat_opt(p.pat()); let mutability = Mutability::from_mutable(p.is_mut()); Pat::Ref { pat, mutability } } ast::PatKind::PathPat(p) => { let path = p.path().and_then(Path::from_ast); path.map(Pat::Path).unwrap_or(Pat::Missing) } ast::PatKind::TuplePat(p) => { let args = p.args().map(|p| self.collect_pat(p)).collect(); Pat::Tuple(args) } ast::PatKind::PlaceholderPat(_) => Pat::Wild, ast::PatKind::StructPat(p) => { let path = p.path().and_then(Path::from_ast); let field_pat_list = p.field_pat_list().expect("every struct should have a field list"); let mut fields: Vec<_> = field_pat_list .bind_pats() .filter_map(|bind_pat| { let ast_pat = ast::Pat::cast(bind_pat.syntax()).expect("bind pat is a pat"); let pat = self.collect_pat(ast_pat); let name = bind_pat.name()?.as_name(); Some(FieldPat { name, pat }) }) .collect(); let iter = field_pat_list.field_pats().filter_map(|f| { let ast_pat = f.pat()?; let pat = self.collect_pat(ast_pat); let name = f.name()?.as_name(); Some(FieldPat { name, pat }) }); fields.extend(iter); Pat::Struct { path, args: fields } } // FIXME: implement ast::PatKind::LiteralPat(_) => Pat::Missing, ast::PatKind::SlicePat(_) | ast::PatKind::RangePat(_) => Pat::Missing, }; let ptr = AstPtr::new(pat); self.alloc_pat(pattern, Either::A(ptr)) } fn collect_pat_opt(&mut self, pat: Option<&ast::Pat>) -> PatId { if let Some(pat) = pat { self.collect_pat(pat) } else { self.pats.alloc(Pat::Missing) } } fn collect_const_body(&mut self, node: &ast::ConstDef) { let body = self.collect_expr_opt(node.body()); self.body_expr = Some(body); } fn collect_static_body(&mut self, node: &ast::StaticDef) { let body = self.collect_expr_opt(node.body()); self.body_expr = Some(body); } fn collect_fn_body(&mut self, node: &ast::FnDef) { if let Some(param_list) = node.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.params.push(param_pat); } for param in param_list.params() { let pat = if let Some(pat) = param.pat() { pat } else { continue; }; let param_pat = self.collect_pat(pat); self.params.push(param_pat); } }; let body = self.collect_block_opt(node.body()); self.body_expr = Some(body); } fn finish(self) -> (Body, BodySourceMap) { let body = Body { owner: self.owner, exprs: self.exprs, pats: self.pats, params: self.params, body_expr: self.body_expr.expect("A body should have been collected"), }; (body, self.source_map) } } pub(crate) fn body_with_source_map_query( db: &impl HirDatabase, def: DefWithBody, ) -> (Arc, Arc) { let mut collector; match def { DefWithBody::Const(ref c) => { let (file_id, src) = c.source(db); collector = ExprCollector::new(def, file_id, def.resolver(db), db); collector.collect_const_body(&src) } DefWithBody::Function(ref f) => { let (file_id, src) = f.source(db); collector = ExprCollector::new(def, file_id, def.resolver(db), db); collector.collect_fn_body(&src) } DefWithBody::Static(ref s) => { let (file_id, src) = s.source(db); collector = ExprCollector::new(def, file_id, def.resolver(db), db); collector.collect_static_body(&src) } } let (body, source_map) = collector.finish(); (Arc::new(body), Arc::new(source_map)) } pub(crate) fn body_hir_query(db: &impl HirDatabase, def: DefWithBody) -> Arc { db.body_with_source_map(def).0 }