[Bug c++/101597] [12 Regression] ICE in pretty-printer formatting an OBJ_TYPE_REF since r12-2132-ga110855667782dac

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101597

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:ef9462581076218d2370fabb09c39d2c83814b9a

commit r12-6487-gef9462581076218d2370fabb09c39d2c83814b9a
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jan 11 19:21:30 2022 +0100

    c++: Fix ICEs with OBJ_TYPE_REF pretty printing [PR101597]

    The following testcase ICEs, because middle-end uses the C++ FE pretty
    printing code through langhooks in the diagnostics.
    The FE expects OBJ_TYPE_REF_OBJECT's type to be useful (pointer to the
    class type it is called on), but in the middle-end conversions between
    pointer types are useless, so the actual type can be some random
    unrelated pointer type (in the testcase void * pointer).  The pretty
    printing code then ICEs on it.

    The following patch fixes that by sticking the original
    OBJ_TYPE_REF_OBJECT's also as type of OBJ_TYPE_REF_TOKEN operand.
    That one must be an INTEGER_CST, all the current uses of
    OBJ_TYPE_REF_TOKEN just use tree_to_uhwi or tree_to_shwi on it,
    and because it is constant, there is no risk of the middle-end propagating
    into it some other pointer type.  So, approach similar to how MEM_REF
    treats its second operand or a couple of internal functions (e.g.
    IFN_VA_ARG) some of its parameters.

    2022-01-11  Jakub Jelinek  <jakub@redhat.com>

            PR c++/101597
    gcc/
            * tree.def (OBJ_TYPE_REF): Document type of OBJ_TYPE_REF_TOKEN.
    gcc/cp/
            * class.c (build_vfn_ref): Build OBJ_TYPE_REF with INTEGER_CST
            OBJ_TYPE_REF_TOKEN with type equal to OBJ_TYPE_REF_OBJECT type.
            * error.c (resolve_virtual_fun_from_obj_type_ref): Use type of
            OBJ_TYPE_REF_TOKEN rather than type of OBJ_TYPE_REF_OBJECT as
            obj_type.
    gcc/objc/
            * objc-act.c (objc_rewrite_function_call): Build OBJ_TYPE_REF
            with INTEGER_CST OBJ_TYPE_REF_TOKEN with type equal to
            OBJ_TYPE_REF_OBJECT type.
            * objc-next-runtime-abi-01.c (build_objc_method_call): Likewise.
            * objc-gnu-runtime-abi-01.c (build_objc_method_call): Likewise.
            * objc-next-runtime-abi-02.c (build_v2_objc_method_fixup_call,
            build_v2_build_objc_method_call): Likewise.
    gcc/testsuite/
            * g++.dg/opt/pr101597.C: New test.