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 B198D3858C00; Thu, 23 Feb 2023 22:50:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B198D3858C00
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1677192602;
	bh=m+Y2LleYgC2wusS6vB9ZFcUfLHhZQBNG9OeAqxL6yVQ=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=pbPRwIU9raH6bHfjl7X6uHXGwNmne4lpYvRiWXwH5vNkZCMBUxmUFxgkY+2yYcwgY
	 1yXeRWHEQoYC2AdWrR+yikGvuxbzWwp32JHSUwFk3TB9aK3CUQ4W2pWf4cPZI8OCIU
	 XnJo6s8cjWtmTXu+v9ml6CMmTsNZl2EKOjDOTvaU=
From: "ibuclaw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/106977] [13 regression] d21 dies with SIGBUS on 32-bit Darwin
Date: Thu, 23 Feb 2023 22:49:59 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: d
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ibuclaw at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P4
X-Bugzilla-Assigned-To: ibuclaw at gdcproject dot org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-106977-4-hLUTOeBrr7@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106977-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106977-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106977

--- Comment #12 from ibuclaw at gcc dot gnu.org ---
Looks like a bad mismatch between C++ and D.

When C++ calls the method, it pushes one register.  When D calls it, pushes
two.

Looks like the method itself returns the result in 2 registers as well - or
maybe uses return slot optimization.
---
// C++ Caller code
#include "tree.h"
#include "dmd/dsymbol.h"
#include "dmd/aggregate.h"
void
set_visibility_for_decl (tree node, Dsymbol *sym)
{
  Visibility visibility =3D sym->visible ();

// C++ Caller asm
        pushl   %ebx
        subl    $20, %esp
        .loc 1 2561 1
        movl    32(%esp), %eax
        movl    28(%esp), %ebx
        .loc 1 2562 40
        movl    (%eax), %edx
        pushl   %eax
        call    *104(%edx)

// D Caller code
import dmd.dsymbol;
import dmd.aggregate;
import dmd.gluelayer;
extern(C++)
void
set_visibility_for_decl (tree_node* node, Dsymbol sym)
{
  Visibility visibility =3D sym.visible();
}
// D Caller asm
        subl    $28, %esp
        .loc 1 5 1
        movl    36(%esp), %eax
        .loc 1 8 27
        leal    8(%esp), %ecx
        subl    $8, %esp
        movl    (%eax), %edx
        pushl   %eax
        pushl   %ecx
        call    *104(%edx)

// D Callee code
override final Visibility visible() pure nothrow @nogc @safe
{
  return visibility;
}
// D Callee asm
        movl    8(%esp), %edx
        movl    4(%esp), %eax
        .loc 1 789 9
        movl    208(%edx), %ecx
        movl    212(%edx), %edx
        movl    %ecx, (%eax)
        movl    %edx, 4(%eax)
        .loc 1 790 5
        ret     $4=