80 lines
2.7 KiB
Rust
80 lines
2.7 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Sanity check AST before lowering it to HIR
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//
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// This pass is supposed to catch things that fit into AST data structures,
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// but not permitted by the language. It runs after expansion when AST is frozen,
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// so it can check for erroneous constructions produced by syntax extensions.
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// This pass is supposed to perform only simple checks not requiring name resolution
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// or type checking or some other kind of complex analysis.
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use rustc::lint;
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use rustc::session::Session;
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use syntax::ast::*;
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use syntax::codemap::Span;
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use syntax::errors;
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use syntax::parse::token::keywords;
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use syntax::visit::{self, Visitor};
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struct SanityChecker<'a> {
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session: &'a Session,
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}
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impl<'a> SanityChecker<'a> {
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fn err_handler(&self) -> &errors::Handler {
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&self.session.parse_sess.span_diagnostic
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}
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fn check_label(&self, label: Ident, span: Span, id: NodeId) {
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if label.name == keywords::StaticLifetime.name() {
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self.err_handler().span_err(span, &format!("invalid label name `{}`", label.name));
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}
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if label.name.as_str() == "'_" {
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self.session.add_lint(
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lint::builtin::LIFETIME_UNDERSCORE, id, span,
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format!("invalid label name `{}`", label.name)
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);
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}
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}
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}
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impl<'a, 'v> Visitor<'v> for SanityChecker<'a> {
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fn visit_lifetime(&mut self, lt: &Lifetime) {
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if lt.name.as_str() == "'_" {
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self.session.add_lint(
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lint::builtin::LIFETIME_UNDERSCORE, lt.id, lt.span,
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format!("invalid lifetime name `{}`", lt.name)
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);
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}
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visit::walk_lifetime(self, lt)
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}
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fn visit_expr(&mut self, expr: &Expr) {
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match expr.node {
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ExprKind::While(_, _, Some(ident)) | ExprKind::Loop(_, Some(ident)) |
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ExprKind::WhileLet(_, _, _, Some(ident)) | ExprKind::ForLoop(_, _, _, Some(ident)) => {
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self.check_label(ident, expr.span, expr.id);
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}
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ExprKind::Break(Some(ident)) | ExprKind::Again(Some(ident)) => {
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self.check_label(ident.node, ident.span, expr.id);
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}
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_ => {}
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}
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visit::walk_expr(self, expr)
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}
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}
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pub fn check_crate(session: &Session, krate: &Crate) {
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visit::walk_crate(&mut SanityChecker { session: session }, krate)
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}
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