[Bug middle-end/78786] GCC hangs/out of memory calling sprintf with large precision

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78786

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Dec 14 21:58:19 2016
New Revision: 243672

URL: https://gcc.gnu.org/viewcvs?rev=243672&root=gcc&view=rev
Log:
PR middle-end/78786 - GCC hangs/out of memory calling sprintf with large
precision

gcc/ChangeLog:

        PR middle-end/78786
        * gimple-ssa-sprintf.c (target_dir_max): New macro.
        (get_mpfr_format_length): New function.
        (format_integer): Use HOST_WIDE_INT instead of int.
        (format_floating_max): Same.
        (format_floating): Call get_mpfr_format_length.
        (format_directive): Use target_dir_max.

gcc/testsuite/ChangeLog:

        PR middle-end/78786
        * gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-7.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-sprintf.c
    trunk/gcc/testsuite/ChangeLog