Skip to content

syntax: improve a few allocations #55542

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Nov 1, 2018
Merged

syntax: improve a few allocations #55542

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions src/libsyntax/ext/expand.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -387,6 +387,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
add_derived_markers(&mut self.cx, item.span(), &traits, item.clone());
let derives = derives.entry(invoc.expansion_data.mark).or_default();

derives.reserve(traits.len());
invocations.reserve(traits.len());
for path in &traits {
let mark = Mark::fresh(self.cx.current_expansion.mark);
derives.push(mark);
Expand Down
2 changes: 1 addition & 1 deletion src/libsyntax_ext/deriving/generic/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1384,7 +1384,7 @@ impl<'a> MethodDef<'a> {
// let __self2_vi = unsafe {
// std::intrinsics::discriminant_value(&arg2) } as i32;
// ```
let mut index_let_stmts: Vec<ast::Stmt> = Vec::new();
let mut index_let_stmts: Vec<ast::Stmt> = Vec::with_capacity(vi_idents.len() + 1);

// We also build an expression which checks whether all discriminants are equal
// discriminant_test = __self0_vi == __self1_vi && __self0_vi == __self2_vi && ...
Expand Down