bjoernager/rust
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Emit unused externs

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This commit is contained in:
est31 2020-06-30 18:58:15 +02:00
parent 76c500ec6c
commit aef1e35edc
4 changed files with 34 additions and 0 deletions
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19
compiler/rustc_errors/src/json.rs
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@ -159,6 +159,19 @@ impl Emitter for JsonEmitter {
}
}
fn emit_unused_externs(&mut self, unused_externs: &[&str]) {
let data = UnusedExterns { unused_extern_names: unused_externs };
let result = if self.pretty {
writeln!(&mut self.dst, "{}", as_pretty_json(&data))
} else {
writeln!(&mut self.dst, "{}", as_json(&data))
}
.and_then(|_| self.dst.flush());
if let Err(e) = result {
panic!("failed to print unused externs: {:?}", e);
}
}
fn source_map(&self) -> Option<&Lrc<SourceMap>> {
Some(&self.sm)
}
@ -322,6 +335,12 @@ struct FutureIncompatReport {
future_incompat_report: Vec<FutureBreakageItem>,
}
#[derive(Encodable)]
struct UnusedExterns<'a, 'b> {
/// List of unused externs by their names.
unused_extern_names: &'a [&'b str],
}
impl Diagnostic {
fn from_errors_diagnostic(diag: &crate::Diagnostic, je: &JsonEmitter) -> Diagnostic {
let sugg = diag.suggestions.iter().map(|sugg| Diagnostic {