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liveness: Delay conversion from a symbol to a string until linting

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This commit is contained in:
Tomasz Miąsko 2020-09-26 00:00:00 +00:00
parent 2fb1564457
commit 70f150b51e
1 changed files with 12 additions and 5 deletions
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17
compiler/rustc_passes/src/liveness.rs
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@ -96,7 +96,7 @@ use rustc_middle::hir::map::Map;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{self, TyCtxt};
use rustc_session::lint;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::Span;
use std::collections::VecDeque;
@ -309,9 +309,9 @@ impl IrMaps<'tcx> {
}
}
fn variable_name(&self, var: Variable) -> String {
fn variable_name(&self, var: Variable) -> Symbol {
match self.var_kinds[var.get()] {
Local(LocalInfo { name, .. }) | Param(_, name) | Upvar(_, name) => name.to_string(),
Local(LocalInfo { name, .. }) | Param(_, name) | Upvar(_, name) => name,
}
}
@ -1587,7 +1587,14 @@ impl<'tcx> Liveness<'_, 'tcx> {
fn should_warn(&self, var: Variable) -> Option<String> {
let name = self.ir.variable_name(var);
if name.is_empty() || name.as_bytes()[0] == b'_' { None } else { Some(name) }
if name == kw::Invalid {
return None;
}
let name: &str = &name.as_str();
if name.as_bytes()[0] == b'_' {
return None;
}
Some(name.to_owned())
}
fn warn_about_unused_upvars(&self, entry_ln: LiveNode) {
@ -1659,7 +1666,7 @@ impl<'tcx> Liveness<'_, 'tcx> {
// bindings, and we also consider the first pattern to be the "authoritative" set of ids.
// However, we should take the ids and spans of variables with the same name from the later
// patterns so the suggestions to prefix with underscores will apply to those too.
let mut vars: FxIndexMap<String, (LiveNode, Variable, Vec<(HirId, Span)>)> = <_>::default();
let mut vars: FxIndexMap<Symbol, (LiveNode, Variable, Vec<(HirId, Span)>)> = <_>::default();
pat.each_binding(|_, hir_id, pat_sp, ident| {
let ln = entry_ln.unwrap_or_else(|| self.live_node(hir_id, pat_sp));