[Bug modula2/118600] Assigning to a record from a constructor can cause an alignment exception

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118600

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

https://gcc.gnu.org/g:d286ece094ca52f41bf71096aa1de0a0cd954dfb

commit r15-8475-gd286ece094ca52f41bf71096aa1de0a0cd954dfb
Author: Gaius Mulley <gaiusmod2@gmail.com>
Date:   Thu Mar 20 20:10:31 2025 +0000

    PR modula2/118600 Assigning to a record causes alignment exception

    This patch recursively tests every assignment (of a constructor
    to a designator) to ensure the types are GCC equivalent.  If they
    are equivalent then it uses gimple assignment and if not then it
    copies a structure by field and uses __builtin_strncpy to copy a
    string cst into an array.  Unions are copied by __builtin_memcpy.

    gcc/m2/ChangeLog:

            PR modula2/118600
            * gm2-compiler/M2GenGCC.mod (PerformCodeBecomes): New procedure.
            (CodeBecomes): Refactor and call PerformCodeBecomes.
            * gm2-gcc/m2builtins.cc (gm2_strncpy_node): New global variable.
            (DoBuiltinStrNCopy): New function.
            (m2builtins_BuiltinStrNCopy): New function.
            (m2builtins_init): Initialize gm2_strncpy_node.
            * gm2-gcc/m2builtins.def (BuiltinStrNCopy): New procedure
            function.
            * gm2-gcc/m2builtins.h (m2builtins_BuiltinStrNCopy): New
            function.
            * gm2-gcc/m2statement.cc (copy_record_fields): New function.
            (copy_array): Ditto.
            (copy_strncpy): Ditto.
            (copy_memcpy): Ditto.
            (CopyByField_Lower): Ditto.
            (m2statement_CopyByField): Ditto.
            * gm2-gcc/m2statement.def (CopyByField): New procedure function.
            * gm2-gcc/m2statement.h (m2statement_CopyByField): New function.
            * gm2-gcc/m2type.cc (check_record_fields): Ditto.
            (check_array_types): Ditto.
            (m2type_IsGccStrictTypeEquivalent): Ditto.
            * gm2-gcc/m2type.def (IsGccStrictTypeEquivalent): New procedure
            function.
            * gm2-gcc/m2type.h (m2type_IsAddress): Replace return type int
            with bool.

    Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>