From 6a83e470e7d1687bbd83c776891122efe814c52f Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@casey.soma.redhat.com>
Date: Sat, 3 Jun 2000 02:20:09 +0000
Subject: [PATCH] exception.cc (__cp_pop_exception): If we aren't popping or
 rethrowing, push down past any uncaught exceptions.

        * exception.cc (__cp_pop_exception): If we aren't popping or
        rethrowing, push down past any uncaught exceptions.
        (__uncatch_exception): Rethrow the currently handled exception.
        Move it to the top of the exception stack.

From-SVN: r34375
---
 gcc/cp/ChangeLog    |  7 ++++++
 gcc/cp/exception.cc | 61 ++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 59 insertions(+), 9 deletions(-)

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index fc78de7f6185..20e505811674 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,10 @@
+2000-06-02  Jason Merrill  <jason@casey.soma.redhat.com>
+
+	* exception.cc (__cp_pop_exception): If we aren't popping or
+	rethrowing, push down past any uncaught exceptions.
+	(__uncatch_exception): Rethrow the currently handled exception.
+	Move it to the top of the exception stack.
+
 Fri Jun  2 19:38:57 2000  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
 	* cp-tree.h: Use struct tree_common instead of a char array.
diff --git a/gcc/cp/exception.cc b/gcc/cp/exception.cc
index a38477b050d8..9263bfeaa011 100644
--- a/gcc/cp/exception.cc
+++ b/gcc/cp/exception.cc
@@ -247,17 +247,37 @@ __cp_push_exception (void *value, void *type, cleanup_fn cleanup)
 extern "C" void
 __cp_pop_exception (cp_eh_info *p)
 {
-  cp_eh_info **q = __get_eh_info ();
+  cp_eh_info **stack = __get_eh_info ();
+  cp_eh_info **q = stack;
 
   --p->handlers;
 
-  /* Don't really pop if there are still active handlers for our exception,
-     or if our exception is being rethrown (i.e. if the active exception is
-     our exception and it is uncaught).  */
-  if (p->handlers != 0
-      || (p == *q && !p->caught))
+  /* Do nothing if our exception is being rethrown (i.e. if the active
+     exception is our exception and it is uncaught).  */
+  if (p == *q && !p->caught)
     return;
 
+  /* Don't really pop if there are still active handlers for our exception;
+     rather, push it down past any uncaught exceptions.  */
+  if (p->handlers != 0)
+    {
+      if (p == *q && p->next && !p->next->caught)
+	{
+	  q = &(p->next);
+	  while (1)
+	    {
+	      if (*q == 0 || (*q)->caught)
+		break;
+
+	      q = &((*q)->next);
+	    }
+	  *stack = p->next;
+	  p->next = *q;
+	  *q = p;
+	}
+      return;
+    }
+
   for (; *q; q = &((*q)->next))
     if (*q == p)
       break;
@@ -277,12 +297,35 @@ __cp_pop_exception (cp_eh_info *p)
   __eh_free (p);
 }
 
+/* We're doing a rethrow.  Find the currently handled exception, mark it
+   uncaught, and move it to the top of the EH stack.  */
+
 extern "C" void
 __uncatch_exception (void)
 {
-  cp_eh_info *p = CP_EH_INFO;
-  if (p == 0)
-    terminate ();
+  cp_eh_info **stack = __get_eh_info ();
+  cp_eh_info **q = stack;
+  cp_eh_info *p;
+
+  while (1)
+    {
+      p = *q;
+
+      if (p == 0)
+	terminate ();
+      if (p->caught)
+	break;
+
+      q = &(p->next);
+    }
+
+  if (q != stack)
+    {
+      *q = p->next;
+      p->next = *stack;
+      *stack = p;
+    }
+
   p->caught = false;
 }
 
-- 
2.43.5