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use static memory for parser table generation #42

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Merged
ehwan merged 3 commits into from
Oct 3, 2025
Merged

use static memory for parser table generation #42

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08dd107
emit terminal sets to static variables
ehwan Oct 3, 2025
c02b34f
emit ruleset and shifted static
ehwan Oct 3, 2025
e97141e
use Default if reduce_map was empty in code emit
ehwan Oct 3, 2025
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30 changes: 20 additions & 10 deletions rusty_lr_parser/src/emit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -679,7 +679,7 @@ impl Grammar {
let new_index = terminal_sets_name_map.len();
terminal_sets_name_map
.entry(set)
.or_insert_with(|| format_ident!("__rustylr_tset{new_index}"))
.or_insert_with(|| format_ident!("__RUSTYLR_TSET{new_index}"))
.clone()
};
for state in &self.states {
Expand Down Expand Up @@ -743,6 +743,7 @@ impl Grammar {

let mut ruleset_rules_body_stream = TokenStream::new();
let mut ruleset_shifted_body_stream = TokenStream::new();
let ruleset_len = state.ruleset.len();
let mut max_shifted = 0;
for &rule in &state.ruleset {
max_shifted = max_shifted.max(rule.shifted);
Expand All @@ -765,23 +766,31 @@ impl Grammar {
quote! { usize }
};

let reduce_map_construct_stream = if reduce_body_stream.is_empty() {
quote! { Default::default() }
} else {
quote! {
{
let mut __reduce_map = std::collections::BTreeMap::new();
#reduce_body_stream
__reduce_map.into_iter().collect()
}
}
};

states_body_stream.extend(quote! {
#module_prefix::parser::state::IntermediateState {
shift_goto_map_term: vec![#shift_term_body_stream],
shift_goto_map_nonterm: vec![#shift_nonterm_body_stream],
reduce_map: {
let mut __reduce_map = std::collections::BTreeMap::new();
#reduce_body_stream
__reduce_map.into_iter().collect()
},
reduce_map: #reduce_map_construct_stream,
ruleset: {
let rules: &'static [#rule_index_typename] = &[
static __RULES: [#rule_index_typename; #ruleset_len] = [
#ruleset_rules_body_stream
];
let shifted: &'static [#shifted_typename] = &[
static __SHIFTED: [#shifted_typename; #ruleset_len] = [
#ruleset_shifted_body_stream
];
rules.iter().zip(shifted.iter()).map(
__RULES.iter().zip(__SHIFTED.iter()).map(
|(&rule, &shifted)| {
#module_prefix::rule::ShiftedRuleRef {
rule: rule as usize,
Expand All @@ -796,6 +805,7 @@ impl Grammar {

let mut terminal_set_initialize_stream = TokenStream::new();
for (set, name) in terminal_sets_name_map {
let len = set.len();
let set_it = set.into_iter().map(|val| match val {
TerminalSymbol::Term(term) => {
let var = &class_variants[term];
Expand All @@ -811,7 +821,7 @@ impl Grammar {
}
});
terminal_set_initialize_stream.extend(quote! {
let #name: Vec<#termclass_typename> = vec![#(#set_it),*];
static #name: [#termclass_typename; #len] = [#(#set_it),*];
});
}

Expand Down
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