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fix: Nail destructuring assignment once and for all #18254

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fix: Nail destructuring assignment once and for all #18254

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9292218
Remove now-incorrect code
ChayimFriedman2 Sep 29, 2024
2fe98c3
Handle destructuring assignments uniformly
ChayimFriedman2 Oct 6, 2024
632a21d
Store patterns desugared from destructuring assignments in source map
ChayimFriedman2 Oct 6, 2024
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178 changes: 167 additions & 11 deletions crates/hir-def/src/body.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ use std::ops::{Deref, Index};

use base_db::CrateId;
use cfg::{CfgExpr, CfgOptions};
use either::Either;
use hir_expand::{name::Name, ExpandError, InFile};
use la_arena::{Arena, ArenaMap, Idx, RawIdx};
use rustc_hash::FxHashMap;
Expand All @@ -22,7 +23,8 @@ use crate::{
db::DefDatabase,
expander::Expander,
hir::{
dummy_expr_id, Binding, BindingId, Expr, ExprId, Label, LabelId, Pat, PatId, RecordFieldPat,
dummy_expr_id, Array, AsmOperand, Binding, BindingId, Expr, ExprId, ExprOrPatId, Label,
LabelId, Pat, PatId, RecordFieldPat, Statement,
},
item_tree::AttrOwner,
nameres::DefMap,
Expand Down Expand Up @@ -67,9 +69,12 @@ pub type LabelSource = InFile<LabelPtr>;
pub type FieldPtr = AstPtr<ast::RecordExprField>;
pub type FieldSource = InFile<FieldPtr>;

pub type PatFieldPtr = AstPtr<ast::RecordPatField>;
pub type PatFieldPtr = AstPtr<Either<ast::RecordExprField, ast::RecordPatField>>;
pub type PatFieldSource = InFile<PatFieldPtr>;

pub type ExprOrPatPtr = AstPtr<Either<ast::Expr, ast::Pat>>;
pub type ExprOrPatSource = InFile<ExprOrPatPtr>;

/// 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
Expand All @@ -83,11 +88,13 @@ pub type PatFieldSource = InFile<PatFieldPtr>;
/// this properly for macros.
#[derive(Default, Debug, Eq, PartialEq)]
pub struct BodySourceMap {
expr_map: FxHashMap<ExprSource, ExprId>,
// AST expressions can create patterns in destructuring assignments. Therefore, `ExprSource` can also map
// to `PatId`, and `PatId` can also map to `ExprSource` (the other way around is unaffected).
expr_map: FxHashMap<ExprSource, ExprOrPatId>,
expr_map_back: ArenaMap<ExprId, ExprSource>,

pat_map: FxHashMap<PatSource, PatId>,
pat_map_back: ArenaMap<PatId, PatSource>,
pat_map_back: ArenaMap<PatId, ExprOrPatSource>,

label_map: FxHashMap<LabelSource, LabelId>,
label_map_back: ArenaMap<LabelId, LabelSource>,
Expand Down Expand Up @@ -286,7 +293,8 @@ impl Body {
| Pat::Path(..)
| Pat::ConstBlock(..)
| Pat::Wild
| Pat::Missing => {}
| Pat::Missing
| Pat::Expr(_) => {}
&Pat::Bind { subpat, .. } => {
if let Some(subpat) = subpat {
f(subpat);
Expand Down Expand Up @@ -322,6 +330,143 @@ impl Body {
None => true,
}
}

pub fn walk_child_exprs(&self, expr_id: ExprId, mut f: impl FnMut(ExprId)) {
let expr = &self[expr_id];
match expr {
Expr::Continue { .. }
| Expr::Const(_)
| Expr::Missing
| Expr::Path(_)
| Expr::OffsetOf(_)
| Expr::Literal(_)
| Expr::Underscore => {}
Expr::InlineAsm(it) => it.operands.iter().for_each(|(_, op)| match op {
AsmOperand::In { expr, .. }
| AsmOperand::Out { expr: Some(expr), .. }
| AsmOperand::InOut { expr, .. } => f(*expr),
AsmOperand::SplitInOut { in_expr, out_expr, .. } => {
f(*in_expr);
if let Some(out_expr) = out_expr {
f(*out_expr);
}
}
AsmOperand::Out { expr: None, .. }
| AsmOperand::Const(_)
| AsmOperand::Label(_)
| AsmOperand::Sym(_) => (),
}),
Expr::If { condition, then_branch, else_branch } => {
f(*condition);
f(*then_branch);
if let &Some(else_branch) = else_branch {
f(else_branch);
}
}
Expr::Let { expr, .. } => {
f(*expr);
}
Expr::Block { statements, tail, .. }
| Expr::Unsafe { statements, tail, .. }
| Expr::Async { statements, tail, .. } => {
for stmt in statements.iter() {
match stmt {
Statement::Let { initializer, else_branch, pat, .. } => {
if let &Some(expr) = initializer {
f(expr);
}
if let &Some(expr) = else_branch {
f(expr);
}
self.walk_exprs_in_pat(*pat, &mut f);
}
Statement::Expr { expr: expression, .. } => f(*expression),
Statement::Item => (),
}
}
if let &Some(expr) = tail {
f(expr);
}
}
Expr::Loop { body, .. } => f(*body),
Expr::Call { callee, args, .. } => {
f(*callee);
args.iter().copied().for_each(f);
}
Expr::MethodCall { receiver, args, .. } => {
f(*receiver);
args.iter().copied().for_each(f);
}
Expr::Match { expr, arms } => {
f(*expr);
arms.iter().map(|arm| arm.expr).for_each(f);
}
Expr::Break { expr, .. }
| Expr::Return { expr }
| Expr::Yield { expr }
| Expr::Yeet { expr } => {
if let &Some(expr) = expr {
f(expr);
}
}
Expr::Become { expr } => f(*expr),
Expr::RecordLit { fields, spread, .. } => {
for field in fields.iter() {
f(field.expr);
}
if let &Some(expr) = spread {
f(expr);
}
}
Expr::Closure { body, .. } => {
f(*body);
}
Expr::BinaryOp { lhs, rhs, .. } => {
f(*lhs);
f(*rhs);
}
Expr::Range { lhs, rhs, .. } => {
if let &Some(lhs) = rhs {
f(lhs);
}
if let &Some(rhs) = lhs {
f(rhs);
}
}
Expr::Index { base, index, .. } => {
f(*base);
f(*index);
}
Expr::Field { expr, .. }
| Expr::Await { expr }
| Expr::Cast { expr, .. }
| Expr::Ref { expr, .. }
| Expr::UnaryOp { expr, .. }
| Expr::Box { expr } => {
f(*expr);
}
Expr::Tuple { exprs, .. } => exprs.iter().copied().for_each(f),
Expr::Array(a) => match a {
Array::ElementList { elements, .. } => elements.iter().copied().for_each(f),
Array::Repeat { initializer, repeat } => {
f(*initializer);
f(*repeat)
}
},
&Expr::Assignment { target, value } => {
self.walk_exprs_in_pat(target, &mut f);
f(value);
}
}
}

pub fn walk_exprs_in_pat(&self, pat_id: PatId, f: &mut impl FnMut(ExprId)) {
self.walk_pats(pat_id, &mut |pat| {
if let Pat::Expr(expr) | Pat::ConstBlock(expr) = self[pat] {
f(expr);
}
});
}
}

impl Default for Body {
Expand Down Expand Up @@ -375,11 +520,18 @@ impl Index<BindingId> for Body {
// FIXME: Change `node_` prefix to something more reasonable.
// Perhaps `expr_syntax` and `expr_id`?
impl BodySourceMap {
pub fn expr_or_pat_syntax(&self, id: ExprOrPatId) -> Result<ExprOrPatSource, SyntheticSyntax> {
match id {
ExprOrPatId::ExprId(id) => self.expr_syntax(id).map(|it| it.map(AstPtr::wrap_left)),
ExprOrPatId::PatId(id) => self.pat_syntax(id),
}
}

pub fn expr_syntax(&self, expr: ExprId) -> Result<ExprSource, SyntheticSyntax> {
self.expr_map_back.get(expr).cloned().ok_or(SyntheticSyntax)
}

pub fn node_expr(&self, node: InFile<&ast::Expr>) -> Option<ExprId> {
pub fn node_expr(&self, node: InFile<&ast::Expr>) -> Option<ExprOrPatId> {
let src = node.map(AstPtr::new);
self.expr_map.get(&src).cloned()
}
Expand All @@ -395,7 +547,7 @@ impl BodySourceMap {
self.expansions.iter().map(|(&a, &b)| (a, b))
}

pub fn pat_syntax(&self, pat: PatId) -> Result<PatSource, SyntheticSyntax> {
pub fn pat_syntax(&self, pat: PatId) -> Result<ExprOrPatSource, SyntheticSyntax> {
self.pat_map_back.get(pat).cloned().ok_or(SyntheticSyntax)
}

Expand Down Expand Up @@ -428,7 +580,7 @@ impl BodySourceMap {
self.pat_field_map_back[&pat]
}

pub fn macro_expansion_expr(&self, node: InFile<&ast::MacroExpr>) -> Option<ExprId> {
pub fn macro_expansion_expr(&self, node: InFile<&ast::MacroExpr>) -> Option<ExprOrPatId> {
let src = node.map(AstPtr::new).map(AstPtr::upcast::<ast::MacroExpr>).map(AstPtr::upcast);
self.expr_map.get(&src).copied()
}
Expand All @@ -444,16 +596,20 @@ impl BodySourceMap {
node: InFile<&ast::FormatArgsExpr>,
) -> Option<&[(syntax::TextRange, Name)]> {
let src = node.map(AstPtr::new).map(AstPtr::upcast::<ast::Expr>);
self.template_map.as_ref()?.0.get(self.expr_map.get(&src)?).map(std::ops::Deref::deref)
self.template_map
.as_ref()?
.0
.get(&self.expr_map.get(&src)?.as_expr()?)
.map(std::ops::Deref::deref)
}

pub fn asm_template_args(
&self,
node: InFile<&ast::AsmExpr>,
) -> Option<(ExprId, &[Vec<(syntax::TextRange, usize)>])> {
let src = node.map(AstPtr::new).map(AstPtr::upcast::<ast::Expr>);
let expr = self.expr_map.get(&src)?;
Some(*expr).zip(self.template_map.as_ref()?.1.get(expr).map(std::ops::Deref::deref))
let expr = self.expr_map.get(&src)?.as_expr()?;
Some(expr).zip(self.template_map.as_ref()?.1.get(&expr).map(std::ops::Deref::deref))
}

/// Get a reference to the body source map's diagnostics.
Expand Down
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