68 lines
1.7 KiB
Rust
68 lines
1.7 KiB
Rust
//! Span debugger
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//!
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//! This module shows spans for all expressions in the crate
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//! to help with compiler debugging.
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use std::str::FromStr;
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use rustc_ast as ast;
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use rustc_ast::visit;
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use rustc_ast::visit::Visitor;
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use crate::errors;
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enum Mode {
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Expression,
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Pattern,
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Type,
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}
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impl FromStr for Mode {
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type Err = ();
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fn from_str(s: &str) -> Result<Mode, ()> {
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let mode = match s {
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"expr" => Mode::Expression,
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"pat" => Mode::Pattern,
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"ty" => Mode::Type,
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_ => return Err(()),
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};
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Ok(mode)
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}
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}
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struct ShowSpanVisitor<'a> {
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span_diagnostic: &'a rustc_errors::Handler,
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mode: Mode,
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}
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impl<'a> Visitor<'a> for ShowSpanVisitor<'a> {
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fn visit_expr(&mut self, e: &'a ast::Expr) {
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if let Mode::Expression = self.mode {
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self.span_diagnostic.emit_warning(errors::ShowSpan { span: e.span, msg: "expression" });
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}
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visit::walk_expr(self, e);
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}
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fn visit_pat(&mut self, p: &'a ast::Pat) {
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if let Mode::Pattern = self.mode {
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self.span_diagnostic.emit_warning(errors::ShowSpan { span: p.span, msg: "pattern" });
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}
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visit::walk_pat(self, p);
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}
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fn visit_ty(&mut self, t: &'a ast::Ty) {
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if let Mode::Type = self.mode {
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self.span_diagnostic.emit_warning(errors::ShowSpan { span: t.span, msg: "type" });
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}
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visit::walk_ty(self, t);
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}
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}
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pub fn run(span_diagnostic: &rustc_errors::Handler, mode: &str, krate: &ast::Crate) {
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let Ok(mode) = mode.parse() else {
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return;
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};
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let mut v = ShowSpanVisitor { span_diagnostic, mode };
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visit::walk_crate(&mut v, krate);
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}
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