From 1a90ad58023b065b7eecddf7f24417889a311850 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Tue, 12 Nov 2019 18:46:57 +0300 Subject: Move expression lowering to hir_def --- crates/ra_hir/src/expr/lower.rs | 593 ---------------------------------------- 1 file changed, 593 deletions(-) delete mode 100644 crates/ra_hir/src/expr/lower.rs (limited to 'crates/ra_hir/src/expr/lower.rs') 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 @@ -//! 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) - } -} -- cgit v1.2.3