[Bug c++/15662] New: Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[Bug c++/15662] New: Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[rajanba at nortelnetworks dot com]

Consider the following:

#include <iostream.h>


class Exception{
  public:
    Exception() {}
    ~Exception() {}
};

std::string foo(bool throwException)
{
   if( throwException ) {
     throw Exception();
   } else {
     std:: string x = "hello world";
     return x;
  }
}

int main(int argc, char** argv)
{
  try {
    const std::string & str  = foo(true);
  } catch(...) {
    cout << "Caught an exception" << endl;
  }
  return 0;
}

Compiled it for POWERPC target and upon execution, it segmentation faults and 
dumps a core. From the core, it is trying to delete the std::string object 
pointed at by str (reference to string to be returned from foo) while unwinding 
the stack.

The same results are obtained if any of the STL classes are used. 

Everything works fine on x86 targets. 


It seems that the gcc compiler is breaching  ISO/ISE 14882:2003 12.2/5 upon 
throw of an exception.

Thanks

-- 
           Summary: Segmentation fault (POWERPC ) when an exception is
                    thrown - even if try catch is specified
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: critical
          Priority: P1
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rajanba at nortelnetworks dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-26 14:19 -------
How is gcc configured?
And which PPC target, linux, or just elf?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal
             Status|UNCONFIRMED                 |WAITING
          Component|c++                         |target
           Keywords|                            |wrong-code
            Summary|Segmentation fault (POWERPC |Segmentation fault (POWERPC
                   |) when an exception is      |) when an exception is
                   |thrown - even if try catch  |thrown - even if try catch
                   |is specified                |is specified


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-26 14:23 -------
I am going to assume eabi, if not please reopen this bug, other wise this is a dup of bug 10778 which I 
am closing this one.

*** This bug has been marked as a duplicate of 10778 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-05-26 14:26 -------
BTW, you are trying to bind the const reference to a temporary. That 
doesn't sound very good... 
 
W. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[rajanba at nortelnetworks dot com]

------- Additional Comments From rajanba at nortelnetworks dot com  2004-05-26 14:38 -------
It is not the same as 10778. Host is linux on powerpc target machine. Compiled 
with options:

 -DLINUX -D_SVID_SOURCE=1 -D_BSD_SOURCE=1 -D_ISOC99_SOURCE=1 -D_GNU_SOURCE=1 
 -mpowerpc -pthread

As per ISO/ISE 14882:2003 12.2/5, when a reference is bound to temporary, the 
temporrary remains in scope till the reference is in scope. It would seem that 
the gcc 3.3.1 tries to delete the temporary object refered to by a const 
reference upon unwinding the stack - when it should not be attempting to delete 
that object. 

IMPORTANT NOTE: Happens only when STL is involved and on POWERPC only.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
   GCC host triplet|                            |linux
 GCC target triplet|                            |PowerPC
         Resolution|DUPLICATE                   |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-26 15:03 -------
I should note this works on powerpc-apple-darwin.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   GCC host triplet|linux                       |
 GCC target triplet|PowerPC                     |powerpc-*-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-05-26 15:53 -------
As Rajan correctly points out, the code is valid of course. Sorry for the 
confusing. 
W. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[amodra at bigpond dot net dot au]

------- Additional Comments From amodra at bigpond dot net dot au  2004-06-10 12:24 -------
testcase passes with 3.3-hammer, 3.4.1 and 3.5.0 powerpc-linux and powerpc64-linux

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |3.4.1 3.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662

[Bug target/15662] Segmentation fault (POWERPC ) when an exception is thrown - even if try catch is specified

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-06-10 13:07 -------
Closing as fixed then.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |3.4.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15662