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perf: reserve Vec capacities where appropriate

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(cherry picked from commit 1e7d77c517)
This commit is contained in:
Will Lillis 2025-07-07 21:56:42 -04:00
parent bf4217f0ff
commit d7529c3265
12 changed files with 32 additions and 25 deletions
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11
cli/generate/src/render.rs
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@ -678,12 +678,12 @@ impl Generator {
&mut next_flat_field_map_index,
);
let mut field_map_ids = Vec::new();
let mut field_map_ids = Vec::with_capacity(self.parse_table.production_infos.len());
for production_info in &self.parse_table.production_infos {
if production_info.field_map.is_empty() {
field_map_ids.push((0, 0));
} else {
let mut flat_field_map = Vec::new();
let mut flat_field_map = Vec::with_capacity(production_info.field_map.len());
for (field_name, locations) in &production_info.field_map {
for location in locations {
flat_field_map.push((field_name.clone(), *location));
@ -1350,7 +1350,12 @@ impl Generator {
indent!(self);
let mut next_table_index = 0;
let mut small_state_indices = Vec::new();
let mut small_state_indices = Vec::with_capacity(
self.parse_table
.states
.len()
.saturating_sub(self.large_state_count),
);
let mut symbols_by_value = HashMap::<(usize, SymbolType), Vec<Symbol>>::new();
for state in self.parse_table.states.iter().skip(self.large_state_count) {
small_state_indices.push(next_table_index);