On Mon, Sep 10, 2018 at 3:42 PM, John Darrington <j...@darrington.wattle.id.au> wrote: > On Mon, Sep 10, 2018 at 03:36:26PM +0100, Jason Merrill wrote: > On Mon, Aug 27, 2018 at 8:20 PM, John Darrington > <j...@darrington.wattle.id.au> wrote: > > * include/dwarf2.h (enum dwarf_unit_type) [DE_EH_PE_udata3]: > New member. > > > What's the rationale? Do you have a separate patch that uses this new > macro? > > Yes. I there is an upcoming patch for GDB. See > https://sourceware.org/ml/gdb-patches/2018-08/msg00731.html
This looks like support for reading fixed 3-byte values from the exception handling unwind information. Do you expect this information to ever need to store 3-byte values? The offsets in the unwind info don't need to correspond exactly to target word sizes, and if you use an assembler that supports it (such as GNU as), the table will use variable-length encoding anyway. Jason
