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Reserve space in advance

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This commit is contained in:
Dániel Buga 2020-10-16 11:43:39 +02:00
parent 2ca0b85593
commit a7f2bb6343
4 changed files with 9 additions and 7 deletions
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2
compiler/rustc_ast/src/tokenstream.rs
View File

@ -221,7 +221,7 @@ impl TokenStream {
}
}
if let Some((pos, comma, sp)) = suggestion {
let mut new_stream = vec![];
let mut new_stream = Vec::with_capacity(self.0.len() + 1);
let parts = self.0.split_at(pos + 1);
new_stream.extend_from_slice(parts.0);
new_stream.push(comma);

10
compiler/rustc_ast_lowering/src/lib.rs
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@ -2011,17 +2011,17 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
//
// For the "output" lifetime parameters, we just want to
// generate `'_`.
let mut generic_args: Vec<_> = lifetime_params[..input_lifetimes_count]
.iter()
.map(|&(span, hir_name)| {
let mut generic_args = Vec::with_capacity(lifetime_params.len());
generic_args.extend(lifetime_params[..input_lifetimes_count].iter().map(
|&(span, hir_name)| {
// Input lifetime like `'a` or `'1`:
GenericArg::Lifetime(hir::Lifetime {
hir_id: self.next_id(),
span,
name: hir::LifetimeName::Param(hir_name),
})
})
.collect();
},
));
generic_args.extend(lifetime_params[input_lifetimes_count..].iter().map(|&(span, _)|
// Output lifetime like `'_`.
GenericArg::Lifetime(hir::Lifetime {

2
compiler/rustc_builtin_macros/src/deriving/debug.rs
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@ -66,7 +66,7 @@ fn show_substructure(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>
let fmt = substr.nonself_args[0].clone();
let mut stmts = vec![];
let mut stmts = Vec::with_capacity(fields.len() + 2);
match vdata {
ast::VariantData::Tuple(..) | ast::VariantData::Unit(..) => {
// tuple struct/"normal" variant

2
compiler/rustc_lint/src/levels.rs
View File

@ -30,6 +30,8 @@ fn lint_levels(tcx: TyCtxt<'_>, cnum: CrateNum) -> LintLevelMap {
let mut builder = LintLevelMapBuilder { levels, tcx, store };
let krate = tcx.hir().krate();
builder.levels.id_to_set.reserve(krate.exported_macros.len() + 1);
let push = builder.levels.push(&krate.item.attrs, &store, true);
builder.levels.register_id(hir::CRATE_HIR_ID);
for macro_def in krate.exported_macros {