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* [Bug c++/14154] New: g++ silently creates incorrect code when "this" used in initializer list
@ 2004-02-16 7:28 rls at tamu dot edu
2004-02-16 7:33 ` [Bug c++/14154] " rls at tamu dot edu
2004-02-16 12:08 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: rls at tamu dot edu @ 2004-02-16 7:28 UTC (permalink / raw)
To: gcc-bugs
I'm not completely sure that this is the problem...but given the same code MS
Visual C++ warns about "'this' used in argument initialization list". G++
merrily compiles the code and then gets a segfault inside of the C++ standard
library.
Here is a code snippet that will reproduce the problem:
(the command-line to compile: g++ test.cpp -g3 -o test)
------------------------
// The obligatory includes
#include <string>
using namespace std;
class bar; // Forward declaration
class foo {
public:
foo(bar * b); // foo takes a pointer-to-bar
};
class bar {
public:
foo f; // bar has a foo member...
string str;
bar() : f(this) { } //...to which it gives pointer-to-self...
void setString(const string &s) { str = s; }
};
//...which foo uses to call back into the partially-constructed bar
// This is probably not valid, in which case should cause a compile
error/warning
foo::foo(bar * b) { b->setString(string("Die, G++!")); }
int main() {
bar b; // BOOM!
return 0;
}
------------------------
Program received signal SIGSEGV, Segmentation fault.
0xffffffff in ?? ()
Current language: auto; currently c
(gdb) bt
#0 0xffffffff in ?? ()
#1 0x4012f785 in ?? () from /lib/tls/libc.so.6
#2 0x40016b28 in ?? () from /lib/ld-linux.so.2
(gdb)
--
Summary: g++ silently creates incorrect code when "this" used in
initializer list
Product: gcc
Version: 3.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rls at tamu dot edu
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i586-mandrake-linux-gnu
GCC host triplet: i586-mandrake-linux-gnu
GCC target triplet: i586-mandrake-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14154
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/14154] g++ silently creates incorrect code when "this" used in initializer list
2004-02-16 7:28 [Bug c++/14154] New: g++ silently creates incorrect code when "this" used in initializer list rls at tamu dot edu
@ 2004-02-16 7:33 ` rls at tamu dot edu
2004-02-16 12:08 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: rls at tamu dot edu @ 2004-02-16 7:33 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rls at tamu dot edu 2004-02-16 07:33 -------
Created an attachment (id=5755)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5755&action=view)
Testcase that reproduces the problem
Here is the source file that I used to cause the error.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14154
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/14154] g++ silently creates incorrect code when "this" used in initializer list
2004-02-16 7:28 [Bug c++/14154] New: g++ silently creates incorrect code when "this" used in initializer list rls at tamu dot edu
2004-02-16 7:33 ` [Bug c++/14154] " rls at tamu dot edu
@ 2004-02-16 12:08 ` pinskia at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-02-16 12:08 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-02-16 12:07 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |diagnostic
Known to fail| |2.95.3 3.1 3.3.3 3.3 3.4.0
| |3.5.0
Last reconfirmed|0000-00-00 00:00:00 |2004-02-16 12:07:56
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14154
^ permalink raw reply [flat|nested] 3+ messages in thread
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2004-02-16 7:28 [Bug c++/14154] New: g++ silently creates incorrect code when "this" used in initializer list rls at tamu dot edu
2004-02-16 7:33 ` [Bug c++/14154] " rls at tamu dot edu
2004-02-16 12:08 ` pinskia at gcc dot gnu dot org
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