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Factor out some Vecs

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This commit is contained in:
Cameron Steffen 2021-11-01 14:12:17 -05:00
parent a9a24d5106
commit 9f6a58e86b
1 changed files with 6 additions and 9 deletions
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15
compiler/rustc_builtin_macros/src/format.rs
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@ -760,9 +760,9 @@ impl<'a, 'b> Context<'a, 'b> {
/// Actually builds the expression which the format_args! block will be
/// expanded to.
fn into_expr(self) -> P<ast::Expr> {
let mut locals =
Vec::with_capacity((0..self.args.len()).map(|i| self.arg_unique_types[i].len()).sum());
let mut counts = Vec::with_capacity(self.count_args.len());
let mut args = Vec::with_capacity(
self.arg_unique_types.iter().map(|v| v.len()).sum::<usize>() + self.count_args.len(),
);
let mut heads = Vec::with_capacity(self.args.len());
// First, build up the static array which will become our precompiled
@ -783,7 +783,7 @@ impl<'a, 'b> Context<'a, 'b> {
// passed to this function.
for (i, e) in self.args.into_iter().enumerate() {
for arg_ty in self.arg_unique_types[i].iter() {
locals.push(Context::format_arg(self.ecx, self.macsp, e.span, arg_ty, i));
args.push(Context::format_arg(self.ecx, self.macsp, e.span, arg_ty, i));
}
heads.push(self.ecx.expr_addr_of(e.span, e));
}
@ -793,13 +793,10 @@ impl<'a, 'b> Context<'a, 'b> {
_ => panic!("should never happen"),
};
let span = spans_pos[index];
counts.push(Context::format_arg(self.ecx, self.macsp, span, &Count, index));
args.push(Context::format_arg(self.ecx, self.macsp, span, &Count, index));
}
// Now create a vector containing all the arguments
let args = locals.into_iter().chain(counts.into_iter());
let args_array = self.ecx.expr_vec(self.macsp, args.collect());
let args_array = self.ecx.expr_vec(self.macsp, args);
// Constructs an AST equivalent to:
//