GlobalFileTable

rustc_codegen_llvm::coverageinfo::mapgen

Struct GlobalFileTable 

Source 
struct GlobalFileTable {
    raw_file_table: FxIndexMap<StableSourceFileId, String>,
    filenames_buffer: Vec<u8>,
    filenames_hash: u64,
}
Expand description

Maps “global” (per-CGU) file ID numbers to their underlying source file paths.

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§raw_file_table: FxIndexMap<StableSourceFileId, String>

This “raw” table doesn’t include the working dir, so a file’s global ID is its index in this set plus one.

§filenames_buffer: Vec<u8>

The file table in encoded form (possibly compressed), which can be included directly in this CGU’s __llvm_covmap record.

§filenames_hash: u64

Truncated hash of the bytes in filenames_buffer.

The llvm-cov tool uses this hash to associate each covfun record with its corresponding filenames table, since the final binary will typically contain multiple covmap records from different compilation units.

Implementations§

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impl GlobalFileTable

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fn build<'a>( tcx: TyCtxt<'_>, all_files: impl Iterator<Item = &'a SourceFile>, ) -> Self

Builds a “global file table” for this CGU, mapping numeric IDs to path strings.

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fn get_existing_id(&self, file: &SourceFile) -> Option<GlobalFileId>

Trait Implementations§

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impl Debug for GlobalFileTable

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 88 bytes