From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 19AF43858D33; Tue, 31 Jan 2023 23:42:45 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 19AF43858D33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1675208565; bh=h20p/IhAq7vbqBARXgdIj8z/+Q+Zj9IxPXWYv9xMeh0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=E6rifZbhpaHJzOzA8JvdlnYxjd044aM0p/wqLvCbpEEOeBubbzjYOMV5valjhbRuh nohWlY7FaCbefvCrdyxi47491iUec0JmBCLIZKnkj5O7VRJt06DZJjz1qRXopa7eZW q3NyNyu1RijrIk/ln319A8RhRV/4/yrOJgyfwAeE= From: "mpolacek at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/107574] [10/11/12/13 Regression] ICE: tree check in cp_fold_convert with ptr to member field cast inside a class not completed and inherent since r9-50-gd760b06868d660bc Date: Tue, 31 Jan 2023 23:42:44 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 13.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: mpolacek at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 10.5 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107574 Marek Polacek changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mpolacek at gcc dot gnu.org --- Comment #6 from Marek Polacek --- Are we sure we want to accept this? I know we did, but that seems like an accident (cp_fold_convert wasn't checking same_type_p). Essentially it comes down to the fact that we're attempting to evaluate a PTRMEM_CST in a class that hasn't been completed yet, but that doesn't work: /* We can't lower this until the class is complete. */ if (!COMPLETE_TYPE_P (DECL_CONTEXT (member))) return cst; and then this unlowered PTRMEM_CST is used as EXPR in tree op1 =3D build_nop (ptrdiff_type_node, expr); and we crash in cp_fold_convert which gets type=3Dptrdiff_type_node, expr=3DPTRMEM_CST and does else if (TREE_CODE (expr) =3D=3D PTRMEM_CST && same_type_p (TYPE_PTRMEM_CLASS_TYPE (type), PTRMEM_CST_CLASS (expr))) where TYPE_PTRMEM_CLASS_TYPE (type) is going to crash. We could just add a TYPE_PTRMEM_P check and go back to the GCC 7 error.=