[Bug modula2/119504] ICE when attempting to access an element of a constant string

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119504

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Gaius Mulley <ga...@gcc.gnu.org>:

https://gcc.gnu.org/g:b69945d511b394ef092c888c6475f8c72bee0c03

commit r15-9011-gb69945d511b394ef092c888c6475f8c72bee0c03
Author: Gaius Mulley <gaiusm...@gmail.com>
Date:   Fri Mar 28 15:25:55 2025 +0000

    PR modula2/119504: ICE when attempting to access an element of a constant
string

    This patch prevents an ICE and generates an error if an array access to a
    constant string is attempted.  The patch also allows HIGH ("string").

    gcc/m2/ChangeLog:

            PR modula2/119504
            * gm2-compiler/M2Quads.mod (BuildHighFunction): Defend against
            Type = NulSym and fall into BuildConstHighFromSym.
            (BuildDesignatorArray): Rewrite to detect an array access to
            a constant string.
            (BuildDesignatorArrayStaticDynamic): New procedure.

    gcc/testsuite/ChangeLog:

            PR modula2/119504
            * gm2/iso/fail/conststrarray2.mod: New test.
            * gm2/iso/run/pass/constarray2.mod: New test.
            * gm2/pim/pass/hexstring.mod: New test.

    Signed-off-by: Gaius Mulley <gaiusm...@gmail.com>