Function transform_dwarf

crates/cranelift/src/debug/transform/mod.rs:130–233

(
    isa: &dyn TargetIsa,
    compilation: &mut Compilation<'_>,
)

}

pub fn transform_dwarf(
    isa: &dyn TargetIsa,
    compilation: &mut Compilation<'_>,
) -> Result<write::Dwarf, Error> {
    dbi_log!("Commencing DWARF transform for {:?}", compilation);

    let mut transforms = PrimaryMap::new();
    for (i, _) in compilation.translations.iter() {
        transforms.push(AddressTransform::new(compilation, i));
    }

    let buffer = Vec::new();

    let dwarf_package = compilation
        .dwarf_package_bytes
        .map(
            |bytes| -> Option<DwarfPackage<gimli::EndianSlice<'_, gimli::LittleEndian>>> {
                read_dwarf_package_from_bytes(bytes, &buffer, compilation.tunables)
            },
        )
        .flatten();

    let out_encoding = gimli::Encoding {
        format: gimli::Format::Dwarf32,
        version: 4, // TODO: this should be configurable
        address_size: isa.pointer_bytes(),
    };
    let mut out_dwarf = write::Dwarf::default();

    let mut vmctx_ptr_die_refs = PrimaryMap::new();

    let mut translated = HashSet::new();

    for (module, translation) in compilation.translations.iter() {
        dbi_log!("[== Transforming CUs for module #{} ==]", module.as_u32());

        let addr_tr = &transforms[module];
        let di = &translation.debuginfo;

        let out_module_synthetic_unit = ModuleSyntheticUnit::new(
            module,
            compilation,
            out_encoding,
            &mut out_dwarf.units,
            &mut out_dwarf.strings,
        );
        // TODO-DebugInfo-Cleanup: move the simulation code to be per-module and delete this map.
        vmctx_ptr_die_refs.push(out_module_synthetic_unit.vmctx_ptr_die_ref());

        let mut filter = write::FilterUnitSection::new(&di.dwarf)?;
        build_dependencies(&mut filter, addr_tr)?;
        let mut convert = out_dwarf.convert_with_filter(filter)?;
        while let Some((mut unit, root_entry)) = convert.read_unit()? {
            if let Some(dwp) = dwarf_package.as_ref()
                && let Some(dwo_id) = unit.read_unit.dwo_id
                && let Ok(Some(split_dwarf)) = dwp.find_cu(dwo_id, unit.read_unit.dwarf)
            {
                let mut split_filter =