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AST/HIR: Introduce ExprKind::Err for better error recovery in the front-end

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This commit is contained in:
Vadim Petrochenkov 2018-12-17 04:57:32 +03:00
parent d2986970ad
commit a5c52c72ae
17 changed files with 51 additions and 11 deletions
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3
src/librustc/cfg/construct.rs
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@ -392,7 +392,8 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
hir::ExprKind::Closure(..) |
hir::ExprKind::Lit(..) |
hir::ExprKind::Path(_) => {
hir::ExprKind::Path(_) |
hir::ExprKind::Err => {
self.straightline(expr, pred, None::<hir::Expr>.iter())
}
}

1
src/librustc/hir/intravisit.rs
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@ -1099,6 +1099,7 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr) {
ExprKind::Yield(ref subexpression) => {
visitor.visit_expr(subexpression);
}
ExprKind::Err => {}
}
}

2
src/librustc/hir/lowering.rs
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@ -4117,6 +4117,8 @@ impl<'a> LoweringContext<'a> {
hir::ExprKind::Yield(P(expr))
}
ExprKind::Err => hir::ExprKind::Err,
// Desugar `ExprIfLet`
// from: `if let <pat> = <sub_expr> <body> [<else_opt>]`
ExprKind::IfLet(ref pats, ref sub_expr, ref body, ref else_opt) => {

7
src/librustc/hir/mod.rs
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@ -1362,6 +1362,7 @@ impl Expr {
ExprKind::Struct(..) => ExprPrecedence::Struct,
ExprKind::Repeat(..) => ExprPrecedence::Repeat,
ExprKind::Yield(..) => ExprPrecedence::Yield,
ExprKind::Err => ExprPrecedence::Err,
}
}
@ -1412,7 +1413,8 @@ impl Expr {
ExprKind::AddrOf(..) |
ExprKind::Binary(..) |
ExprKind::Yield(..) |
ExprKind::Cast(..) => {
ExprKind::Cast(..) |
ExprKind::Err => {
false
}
}
@ -1525,6 +1527,9 @@ pub enum ExprKind {
/// A suspension point for generators. This is `yield <expr>` in Rust.
Yield(P<Expr>),
/// Placeholder for an expression that wasn't syntactically well formed in some way.
Err,
}
/// Optionally `Self`-qualified value/type path or associated extension.

9
src/librustc/hir/print.rs
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@ -430,7 +430,9 @@ impl<'a> State<'a> {
self.s.word("_")?;
}
hir::TyKind::Err => {
self.s.word("?")?;
self.popen()?;
self.s.word("/*ERROR*/")?;
self.pclose()?;
}
}
self.end()
@ -1540,6 +1542,11 @@ impl<'a> State<'a> {
self.word_space("yield")?;
self.print_expr_maybe_paren(&expr, parser::PREC_JUMP)?;
}
hir::ExprKind::Err => {
self.popen()?;
self.s.word("/*ERROR*/")?;
self.pclose()?;
}
}
self.ann.post(self, AnnNode::Expr(expr))?;
self.end()

3
src/librustc/ich/impls_hir.rs
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@ -592,7 +592,8 @@ impl_stable_hash_for!(enum hir::ExprKind {
InlineAsm(asm, inputs, outputs),
Struct(path, fields, base),
Repeat(val, times),
Yield(val)
Yield(val),
Err
});
impl_stable_hash_for!(enum hir::LocalSource {

3
src/librustc/middle/expr_use_visitor.rs
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@ -479,7 +479,8 @@ impl<'a, 'gcx, 'tcx> ExprUseVisitor<'a, 'gcx, 'tcx> {
}
hir::ExprKind::Continue(..) |
hir::ExprKind::Lit(..) => {}
hir::ExprKind::Lit(..) |
hir::ExprKind::Err => {}
hir::ExprKind::Loop(ref blk, _, _) => {
self.walk_block(&blk);

6
src/librustc/middle/liveness.rs
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@ -515,6 +515,7 @@ fn visit_expr<'a, 'tcx>(ir: &mut IrMaps<'a, 'tcx>, expr: &'tcx Expr) {
hir::ExprKind::Box(..) |
hir::ExprKind::Yield(..) |
hir::ExprKind::Type(..) |
hir::ExprKind::Err |
hir::ExprKind::Path(hir::QPath::TypeRelative(..)) => {
intravisit::walk_expr(ir, expr);
}
@ -1254,7 +1255,8 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
self.propagate_through_exprs(inputs, succ)
}
hir::ExprKind::Lit(..) | hir::ExprKind::Path(hir::QPath::TypeRelative(..)) => {
hir::ExprKind::Lit(..) | hir::ExprKind::Err |
hir::ExprKind::Path(hir::QPath::TypeRelative(..)) => {
succ
}
@ -1521,7 +1523,7 @@ fn check_expr<'a, 'tcx>(this: &mut Liveness<'a, 'tcx>, expr: &'tcx Expr) {
hir::ExprKind::Block(..) | hir::ExprKind::AddrOf(..) |
hir::ExprKind::Struct(..) | hir::ExprKind::Repeat(..) |
hir::ExprKind::Closure(..) | hir::ExprKind::Path(_) | hir::ExprKind::Yield(..) |
hir::ExprKind::Box(..) | hir::ExprKind::Type(..) => {
hir::ExprKind::Box(..) | hir::ExprKind::Type(..) | hir::ExprKind::Err => {
intravisit::walk_expr(this, expr);
}
}

2
src/librustc/middle/mem_categorization.rs
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@ -687,7 +687,7 @@ impl<'a, 'gcx, 'tcx> MemCategorizationContext<'a, 'gcx, 'tcx> {
hir::ExprKind::Block(..) | hir::ExprKind::Loop(..) | hir::ExprKind::Match(..) |
hir::ExprKind::Lit(..) | hir::ExprKind::Break(..) |
hir::ExprKind::Continue(..) | hir::ExprKind::Struct(..) | hir::ExprKind::Repeat(..) |
hir::ExprKind::InlineAsm(..) | hir::ExprKind::Box(..) => {
hir::ExprKind::InlineAsm(..) | hir::ExprKind::Box(..) | hir::ExprKind::Err => {
Ok(self.cat_rvalue_node(expr.hir_id, expr.span, expr_ty))
}
}

1
src/librustc_mir/hair/cx/expr.rs
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@ -780,6 +780,7 @@ fn make_mirror_unadjusted<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
hir::ExprKind::Tup(ref fields) => ExprKind::Tuple { fields: fields.to_ref() },
hir::ExprKind::Yield(ref v) => ExprKind::Yield { value: v.to_ref() },
hir::ExprKind::Err => unreachable!(),
};
Expr {

3
src/librustc_passes/rvalue_promotion.rs
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@ -449,7 +449,8 @@ fn check_expr_kind<'a, 'tcx>(
struct_result
}
hir::ExprKind::Lit(_) => Promotable,
hir::ExprKind::Lit(_) |
hir::ExprKind::Err => Promotable,
hir::ExprKind::AddrOf(_, ref expr) |
hir::ExprKind::Repeat(ref expr, _) => {

3
src/librustc_typeck/check/mod.rs
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@ -4513,6 +4513,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
}
tcx.mk_unit()
}
hir::ExprKind::Err => {
tcx.types.err
}
}
}

4
src/libsyntax/ast.rs
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@ -1001,6 +1001,7 @@ impl Expr {
ExprKind::Paren(..) => ExprPrecedence::Paren,
ExprKind::Try(..) => ExprPrecedence::Try,
ExprKind::Yield(..) => ExprPrecedence::Yield,
ExprKind::Err => ExprPrecedence::Err,
}
}
}
@ -1160,6 +1161,9 @@ pub enum ExprKind {
/// A `yield`, with an optional value to be yielded.
Yield(Option<P<Expr>>),
/// Placeholder for an expression that wasn't syntactically well formed in some way.
Err,
}
/// The explicit `Self` type in a "qualified path". The actual

1
src/libsyntax/fold.rs
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@ -1367,6 +1367,7 @@ pub fn noop_fold_expr<T: Folder>(Expr {id, node, span, attrs}: Expr, folder: &mu
ExprKind::Yield(ex) => ExprKind::Yield(ex.map(|x| folder.fold_expr(x))),
ExprKind::Try(ex) => ExprKind::Try(folder.fold_expr(ex)),
ExprKind::TryBlock(body) => ExprKind::TryBlock(folder.fold_block(body)),
ExprKind::Err => ExprKind::Err,
},
id: folder.new_id(id),
span: folder.new_span(span),

9
src/libsyntax/print/pprust.rs
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@ -1093,7 +1093,9 @@ impl<'a> State<'a> {
self.s.word("_")?;
}
ast::TyKind::Err => {
self.s.word("?")?;
self.popen()?;
self.s.word("/*ERROR*/")?;
self.pclose()?;
}
ast::TyKind::ImplicitSelf => {
self.s.word("Self")?;
@ -2391,6 +2393,11 @@ impl<'a> State<'a> {
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?
}
ast::ExprKind::Err => {
self.popen()?;
self.s.word("/*ERROR*/")?;
self.pclose()?
}
}
self.ann.post(self, AnnNode::Expr(expr))?;
self.end()

4
src/libsyntax/util/parser.rs
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@ -267,6 +267,7 @@ pub enum ExprPrecedence {
TryBlock,
Struct,
Async,
Err,
}
impl ExprPrecedence {
@ -325,7 +326,8 @@ impl ExprPrecedence {
ExprPrecedence::Block |
ExprPrecedence::TryBlock |
ExprPrecedence::Async |
ExprPrecedence::Struct => PREC_PAREN,
ExprPrecedence::Struct |
ExprPrecedence::Err => PREC_PAREN,
}
}
}

1
src/libsyntax/visit.rs
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@ -802,6 +802,7 @@ pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) {
ExprKind::TryBlock(ref body) => {
visitor.visit_block(body)
}
ExprKind::Err => {}
}
visitor.visit_expr_post(expression)