- // The `uwtable` attribute according to LLVM is:
- //
- // This attribute indicates that the ABI being targeted requires that an
- // unwind table entry be produced for this function even if we can show
- // that no exceptions passes by it. This is normally the case for the
- // ELF x86-64 abi, but it can be disabled for some compilation units.
- //
- // Typically when we're compiling with `-C panic=abort` (which implies this
- // `no_landing_pads` check) we don't need `uwtable` because we can't
- // generate any exceptions! On Windows, however, exceptions include other
- // events such as illegal instructions, segfaults, etc. This means that on
- // Windows we end up still needing the `uwtable` attribute even if the `-C
- // panic=abort` flag is passed.
- //
- // You can also find more info on why Windows is whitelisted here in:
- // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
- if !cx.sess().no_landing_pads() ||
- cx.sess().target.target.options.requires_uwtable {
- attributes::emit_uwtable(lldecl, true);
- }
-