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Diffstat (limited to 'crates/span/src/ast_id.rs')
| -rw-r--r-- | crates/span/src/ast_id.rs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/crates/span/src/ast_id.rs b/crates/span/src/ast_id.rs index bd49e08b10..e54e0bd2fc 100644 --- a/crates/span/src/ast_id.rs +++ b/crates/span/src/ast_id.rs @@ -48,6 +48,11 @@ pub const ROOT_ERASED_FILE_AST_ID: ErasedFileAstId = pub const FIXUP_ERASED_FILE_AST_ID_MARKER: ErasedFileAstId = ErasedFileAstId(pack_hash_index_and_kind(0, 0, ErasedFileAstIdKind::Fixup as u32)); +/// [`ErasedFileAstId`] used as the span for syntax nodes that should not be mapped down to +/// macro expansion. Any `Span` containing this file id is to be considered fake. +pub const NO_DOWNMAP_ERASED_FILE_AST_ID_MARKER: ErasedFileAstId = + ErasedFileAstId(pack_hash_index_and_kind(0, 0, ErasedFileAstIdKind::NoDownmap as u32)); + /// This is a type erased FileAstId. #[derive(Clone, Copy, PartialEq, Eq, Hash)] pub struct ErasedFileAstId(u32); @@ -95,6 +100,7 @@ impl fmt::Debug for ErasedFileAstId { BlockExpr, AsmExpr, Fixup, + NoDownmap, ); if f.alternate() { write!(f, "{kind}[{:04X}, {}]", self.hash_value(), self.index()) @@ -150,6 +156,9 @@ enum ErasedFileAstIdKind { // because incrementality is not a problem, they will always be the only item in the macro file, // and memory usage also not because they're rare. AsmExpr, + /// Represents a fake [`ErasedFileAstId`] that should not be mapped down to macro expansion + /// result. + NoDownmap, /// Keep this last. Root, } @@ -158,7 +167,7 @@ enum ErasedFileAstIdKind { const HASH_BITS: u32 = 16; const INDEX_BITS: u32 = 11; const KIND_BITS: u32 = 5; -const _: () = assert!(ErasedFileAstIdKind::Fixup as u32 <= ((1 << KIND_BITS) - 1)); +const _: () = assert!(ErasedFileAstIdKind::Root as u32 <= ((1 << KIND_BITS) - 1)); const _: () = assert!(HASH_BITS + INDEX_BITS + KIND_BITS == u32::BITS); #[inline] |