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Refactor SyntaxContext::ctxt logic.

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This commit is contained in:
Camille GILLOT 2023-04-18 17:54:34 +00:00
parent de96f3d873
commit 99962a8418
1 changed files with 14 additions and 10 deletions
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24
compiler/rustc_span/src/span_encoding.rs
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@ -181,19 +181,23 @@ impl Span {
#[inline]
pub fn ctxt(self) -> SyntaxContext {
let ctxt_or_tag = self.ctxt_or_tag as u32;
if ctxt_or_tag <= MAX_CTXT {
if self.len_or_tag == LEN_TAG || self.len_or_tag & PARENT_MASK == 0 {
// Inline format or interned format with inline ctxt.
SyntaxContext::from_u32(ctxt_or_tag)
// Check for interned format.
if self.len_or_tag == LEN_TAG {
if ctxt_or_tag == CTXT_TAG {
// Fully interned format.
let index = self.base_or_index;
with_span_interner(|interner| interner.spans[index as usize].ctxt)
} else {
// Inline format or interned format with inline parent.
// We know that the SyntaxContext is root.
SyntaxContext::root()
// Interned format with inline ctxt.
SyntaxContext::from_u32(ctxt_or_tag)
}
} else if self.len_or_tag & PARENT_MASK == 0 {
// Inline format with inline ctxt.
SyntaxContext::from_u32(ctxt_or_tag)
} else {
// Interned format.
let index = self.base_or_index;
with_span_interner(|interner| interner.spans[index as usize].ctxt)
// Inline format with inline parent.
// We know that the SyntaxContext is root.
SyntaxContext::root()
}
}
}