From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 3D66A384803D; Thu, 10 Jun 2021 21:08:31 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3D66A384803D
From: "hedayat.fwd at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101010] Feature request: add builtins to provide mangled
 symbols, optionally with a prefix
Date: Thu, 10 Jun 2021 21:08:30 +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: 11.1.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: hedayat.fwd at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-101010-4-aBOkjcCN14@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-101010-4@http.gcc.gnu.org/bugzilla/>
References: <bug-101010-4@http.gcc.gnu.org/bugzilla/>
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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 10 Jun 2021 21:08:31 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101010

--- Comment #2 from Hedayat Vatankhah <hedayat.fwd at gmail dot com> ---
(In reply to Martin Sebor from comment #1)
> Does the type_info::name() string match what you're looking for?

No, not at all. Looks like I've not clearly described my intent.=20

First of all, type_info::name() is a runtime function. Both builtins I asked
are compile-time builtins: they should be replaced at compile time with the
desired string or symbol.

Also, I want the symbol name of the referred function or variable, not its
type. What your sample program outputs is the mangled name of type "void
(MyClass::*)(MyClass*, int)", but what I want is the mangled name of symbol
"void MyClass::member(MyClass*, int)".=20

Finally, I asked about two distinct type of builtins:
1. The first kind is replaced at compile time with the mangled name as a
string. This kind, makes the following possible (note that probably droppin=
g &
makes it more clear):
void f() __attribute__ ((weak, alias (__builtin_mangle(MyClass::member))));
Should become same as the following:
void f() __attribute__ ((weak, alias ("_ZN7MyClass6memberEi")));


2. The second kind, does not generate a "string"; It generates a symbol at
compile time. Consider the example I provided in comment 0, it should be
converted to the following at compile time:

void __wrap__ZN7MyClass6memberEi(MyClass *mc_this, int a)
{
   if (call_real)
       __real__ZN7MyClass6memberEi(mc_this, a);
   else
   {...}
}=