[Bug tree-optimization/86853] sprintf optimization for wide strings doesn't account for conversion failure

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86853

--- Comment #2 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Aug 17 04:01:14 2018
New Revision: 263612

URL: https://gcc.gnu.org/viewcvs?rev=263612&root=gcc&view=rev
Log:
gcc/ChangeLog:

        PR tree-optimization/86853
        * gimple-ssa-sprintf.c (struct format_result): Rename member.
        (struct fmtresult): Add member and initialize it in ctors.
        (format_character): Handle %C.  Extend range to NUL.  Set MAYFAIL.
        (format_string): Handle %S the same as %ls.  Set MAYFAIL.
        (format_directive): Set POSUNDER4K when MAYFAIL is set.
        (parse_directive): Handle %C same as %c.
        (sprintf_dom_walker::compute_format_length): Adjust.
        (is_call_safe): Adjust.

gcc/testsuite/ChangeLog:

        PR tree-optimization/86853
        * gcc.dg/tree-ssa/builtin-sprintf-10.c: New test.
        * gcc.dg/tree-ssa/builtin-sprintf-11.c: New test.
        * gcc.dg/tree-ssa/builtin-sprintf-warn-18.c: Adjust.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-10.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-11.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-sprintf.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-18.c