re PR c++/5757 (Throwing exception in constructor, causes segfault during unwind)

        PR c++/5757
        * init.c (build_new_1): Pass the right pointer to op delete.

From-SVN: r50917

gcc/cp/ChangeLog

+2002-03-17  Jason Merrill  <jason@redhat.com>
+
+	PR c++/5757
+	* init.c (build_new_1): Pass the right pointer to op delete.
+
 2002-03-16  Nathan Sidwell  <nathan@codesourcery.com>
 
 	PR c++/4361

gcc/cp/init.c

@@ -2288,7 +2288,7 @@ build_new_1 (exp)
     use_cookie = 0;
   /* When using placement new, users may not realize that they need
      the extra storage.  We require that the operator called be
-     the global placement operator delete[].  */
+     the global placement operator new[].  */
   else if (placement && !TREE_CHAIN (placement) 
 	   && same_type_p (TREE_TYPE (TREE_VALUE (placement)),
 			   ptr_type_node))
@@ -2473,13 +2473,22 @@ build_new_1 (exp)
 	  tree cleanup;
 	  int flags = (LOOKUP_NORMAL 
 		       | (globally_qualified_p * LOOKUP_GLOBAL));
+	  tree delete_node;
+
+	  if (use_cookie)
+	    /* Subtract the padding back out to get to the pointer returned
+	       from operator new.  */
+	    delete_node = fold (build (MINUS_EXPR, TREE_TYPE (alloc_node),
+				       alloc_node, cookie_size));
+	  else
+	    delete_node = alloc_node;
 
 	  /* The Standard is unclear here, but the right thing to do
              is to use the same method for finding deallocation
              functions that we use for finding allocation functions.  */
 	  flags |= LOOKUP_SPECULATIVELY;
 
-	  cleanup = build_op_delete_call (dcode, alloc_node, size, flags,
+	  cleanup = build_op_delete_call (dcode, delete_node, size, flags,
 					  (placement_allocation_fn_p 
 					   ? alloc_call : NULL_TREE));
 

gcc/testsuite/g++.dg/eh/new1.C

+// PR c++/5757
+// Test that when a constructor throws in a new-expression, we pass the
+// right pointer to operator delete.
+
+// { dg-do run }
+
+#include <new>
+
+int ret = 1;
+
+void *ptr;
+void * operator new[] (size_t s) throw (std::bad_alloc)
+{
+  ptr = operator new (s);
+  return ptr;
+}
+
+void operator delete[] (void *p) throw ()
+{
+  if (p == ptr)
+    ret = 0;
+  operator delete (p);
+}
+
+struct A
+{
+  A() { throw 1; }
+  ~A() {}
+};
+
+int
+main ()
+{
+  try
+    {
+      A *p = new A[4];
+    }
+  catch (...) {}
+  return ret;
+}