Unhandled exceptions leak

[Momchil Velikov]

   When a thread is terminated from within an exception handling block,
exception object(s) (__cxa_exeption) are leaked, as the TSD destructor
for __cxa_eh_globals instance does delete them.  The following program
demonstrates the leak.  A patch and a ChangeLog entry follows.

#include <pthread.h>

static void *
foo (void *p)
{
   try
     {
       throw 0;
     }
   catch (int)
     {
       pthread_exit (0);
     }
}

int
main ()
{
   pthread_t t;
   void *p;

   pthread_create (&t, 0, foo, 0);
   pthread_join (t, &p);
   return 0;
}


--- /home/velco/src/gcc-4.0/libstdc++-v3/libsupc++/eh_globals.cc.~1.6.~ 
Tue Aug 3 09:45:54 2004
+++ /home/velco/src/gcc-4.0/libstdc++-v3/libsupc++/eh_globals.cc Wed Oct 
27 20:50:17 2004
@@ -48,7 +48,19 @@
  get_globals_dtor (void *ptr)
  {
    if (ptr)
-    std::free (ptr);
+    {
+      __cxa_exception *exn, *next;
+
+      exn = ((__cxa_eh_globals *) ptr)->caughtExceptions;
+      while (exn)
+	{
+	  next = exn->nextException;
+	  _Unwind_DeleteException (&exn->unwindHeader);
+	  exn = next;
+	}
+
+      std::free (ptr);
+    }
  }

  static void

2004-10-27  Momchil Velikov  <velco@fadata.bg>

	* libsupc++/eh_globals.cc (get_globals_dtor): Delete unhandled
	exceptions.