parseAbbrevTable

fn parseAbbrevTable(di: *Dwarf, gpa: Allocator, offset: u64) !Abbrev.Table {
    var fr: Reader = .fixed(di.section(.debug_abbrev).?);
    fr.seek = cast(usize, offset) orelse return bad();

    var abbrevs: std.ArrayList(Abbrev) = .empty;
    defer {
        for (abbrevs.items) |*abbrev| {
            abbrev.deinit(gpa);
        }
        abbrevs.deinit(gpa);
    }

    var attrs: std.ArrayList(Abbrev.Attr) = .empty;
    defer attrs.deinit(gpa);

    while (true) {
        const code = try fr.takeLeb128(u64);
        if (code == 0) break;
        const tag_id = try fr.takeLeb128(u64);
        const has_children = (try fr.takeByte()) == DW.CHILDREN.yes;

        while (true) {
            const attr_id = try fr.takeLeb128(u64);
            const form_id = try fr.takeLeb128(u64);
            if (attr_id == 0 and form_id == 0) break;
            try attrs.append(gpa, .{
                .id = attr_id,
                .form_id = form_id,
                .payload = switch (form_id) {
                    FORM.implicit_const => try fr.takeLeb128(i64),
                    else => undefined,
                },
            });
        }
        try abbrevs.ensureUnusedCapacity(gpa, 1);
        abbrevs.appendAssumeCapacity(.{
            .code = code,
            .tag_id = tag_id,
            .has_children = has_children,
            .attrs = try attrs.toOwnedSlice(gpa),
        });
    }

    return .{
        .offset = offset,
        .abbrevs = try abbrevs.toOwnedSlice(gpa),
    };
}