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Bump parser step limit a little

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Laurențiu Nicola 2021-12-06 11:47:36 +02:00
parent 7d6fcbc0be
commit f5db6e0e95
3 changed files with 7 additions and 1 deletions
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1
Cargo.lock generated
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@ -1071,6 +1071,7 @@ name = "parser"
version = "0.0.0" version = "0.0.0"
dependencies = [ dependencies = [
"drop_bomb", "drop_bomb",
"limit",
] ]
[[package]] [[package]]

2
crates/parser/Cargo.toml
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@ -11,3 +11,5 @@ doctest = false
[dependencies] [dependencies]
drop_bomb = "0.1.4" drop_bomb = "0.1.4"
limit = { path = "../limit", version = "0.0.0" }

5
crates/parser/src/parser.rs
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@ -3,6 +3,7 @@
use std::cell::Cell; use std::cell::Cell;
use drop_bomb::DropBomb; use drop_bomb::DropBomb;
use limit::Limit;
use crate::{ use crate::{
event::Event, event::Event,
@ -26,6 +27,8 @@ pub(crate) struct Parser<'t> {
steps: Cell<u32>, steps: Cell<u32>,
} }
static PARSER_STEP_LIMIT: Limit = Limit::new(15_000_000);
impl<'t> Parser<'t> { impl<'t> Parser<'t> {
pub(super) fn new(token_source: &'t mut dyn TokenSource) -> Parser<'t> { pub(super) fn new(token_source: &'t mut dyn TokenSource) -> Parser<'t> {
Parser { token_source, events: Vec::new(), steps: Cell::new(0) } Parser { token_source, events: Vec::new(), steps: Cell::new(0) }
@ -48,7 +51,7 @@ impl<'t> Parser<'t> {
assert!(n <= 3); assert!(n <= 3);
let steps = self.steps.get(); let steps = self.steps.get();
assert!(steps <= 10_000_000, "the parser seems stuck"); assert!(PARSER_STEP_LIMIT.check(steps as usize).is_ok(), "the parser seems stuck");
self.steps.set(steps + 1); self.steps.set(steps + 1);
self.token_source.lookahead_nth(n).kind self.token_source.lookahead_nth(n).kind