pub const CompileUnit = struct {
    version: u16,
    format: Format,
    die: Die,
    pc_range: ?PcRange,

    str_offsets_base: usize,
    addr_base: usize,
    rnglists_base: usize,
    loclists_base: usize,
    frame_base: ?*const FormValue,

    src_loc_cache: ?SrcLocCache,

    pub const SrcLocCache = struct {
        line_table: LineTable,
        directories: []const FileEntry,
        files: []FileEntry,
        version: u16,

        pub const LineTable = std.AutoArrayHashMapUnmanaged(u64, LineEntry);

        pub const LineEntry = struct {
            line: u32,
            column: u32,
            /// Offset by 1 depending on whether Dwarf version is >= 5.
            file: u32,

            pub const invalid: LineEntry = .{
                .line = undefined,
                .column = undefined,
                .file = std.math.maxInt(u32),
            };

            pub fn isInvalid(le: LineEntry) bool {
                return le.file == invalid.file;
            }
        };

        pub fn findSource(slc: *const SrcLocCache, address: u64) !LineEntry {
            const index = std.sort.upperBound(u64, slc.line_table.keys(), address, struct {
                fn order(context: u64, item: u64) std.math.Order {
                    return std.math.order(context, item);
                }
            }.order);
            if (index == 0) return missing();
            return slc.line_table.values()[index - 1];
        }
    };
}