bjoernager/rust
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Shrink parser positions from usize to u32.

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The number of source code bytes can't exceed a `u32`'s range, so a token
position also can't. This reduces the size of `Parser` and
`LazyAttrTokenStreamImpl` by eight bytes each.
This commit is contained in:
Nicholas Nethercote 2024-07-02 16:31:24 +10:00
parent f5b28968db
commit 3d750e2702
5 changed files with 21 additions and 24 deletions
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6
compiler/rustc_parse/src/parser/mod.rs
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@ -153,7 +153,7 @@ pub struct Parser<'a> {
expected_tokens: Vec<TokenType>,
token_cursor: TokenCursor,
// The number of calls to `bump`, i.e. the position in the token stream.
num_bump_calls: usize,
num_bump_calls: u32,
// During parsing we may sometimes need to 'unglue' a glued token into two
// component tokens (e.g. '>>' into '>' and '>), so the parser can consume
// them one at a time. This process bypasses the normal capturing mechanism
@ -192,7 +192,7 @@ pub struct Parser<'a> {
// This type is used a lot, e.g. it's cloned when matching many declarative macro rules with nonterminals. Make sure
// it doesn't unintentionally get bigger.
#[cfg(target_pointer_width = "64")]
rustc_data_structures::static_assert_size!(Parser<'_>, 264);
rustc_data_structures::static_assert_size!(Parser<'_>, 256);
/// Stores span information about a closure.
#[derive(Clone, Debug)]
@ -1572,7 +1572,7 @@ impl<'a> Parser<'a> {
self.expected_tokens.clear();
}
pub fn approx_token_stream_pos(&self) -> usize {
pub fn approx_token_stream_pos(&self) -> u32 {
self.num_bump_calls
}
}