Re: c++/9629: [3.2/3.3/3.4 regression] virtual inheritance segfault

Re: c++/9629: [3.2/3.3/3.4 regression] virtual inheritance segfault

[nathan]

Synopsis: [3.2/3.3/3.4 regression] virtual inheritance segfault

Responsible-Changed-From-To: unassigned->nathan
Responsible-Changed-By: nathan
Responsible-Changed-When: Fri Feb 21 16:08:06 2003
Responsible-Changed-Why:
    fixing

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9629

Re: c++/9629: [3.2/3.3/3.4 regression] virtual inheritance segfault

[nathan]

Synopsis: [3.2/3.3/3.4 regression] virtual inheritance segfault

State-Changed-From-To: analyzed->closed
State-Changed-By: nathan
State-Changed-When: Mon Mar 17 11:52:48 2003
State-Changed-Why:
    fixed on HEAD and 3.3
    2003-03-16  Nathan Sidwell  <nathan@codesourcery.com>
    
    	PR c++/9629
    	* cp-tree.h (struct language_function): Add in_base_initializer.
    	(in_base_initializer): define it.
    	(expand_member_init): Remove INIT param.
    	* init.c (expand_member_init): Remove INIT param, return the member.
    	(emit_mem_initializers): Set in_base_initializer.
    	* class.c (build_base_path): Check in_base_initializer.
    	* parser.c (cp_parser_mem_initializer): Set in_base_initializer.
    	* pt.c (tsubst_initializer_list): Likewise.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9629

Re: c++/9629: [3.2/3.3/3.4 regression] virtual inheritance segfault

[bangerth]

Old Synopsis: virtual inheritance segfault
New Synopsis: [3.2/3.3/3.4 regression] virtual inheritance segfault

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Fri Feb 14 20:46:18 2003
State-Changed-Why:
    Confirmed. Here's a very slightly reduced testcase:
    --------------------------
    struct A { };
    
    struct B {
    	B(A *) {}
    };
    
    struct C : virtual public A, public B {
    	C() : B(this) {}
    };
    
    struct D : virtual public C {};
    
    main() {
      new D();
    }
    ------------------------
    Executing this program segfaults with 3.2.2, 3.3, and 3.4.
    So it is a regression, assuming the code is legal.
    
    The problem is in casting this to A* in the constructor
    C::C. It's trying to cast to a virtual base, and it seems
    to me that this information is not available at the time
    we get to C::C, which then causes the segfault. But that's
    just a wild guess.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9629