src/hotspot/share/memory/operator_new.cpp
changeset 47216 71c04702a3d5
parent 38254 05e46b580b4e
child 58898 4ec9fc2b2f0d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/operator_new.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "utilities/debug.hpp"
+
+#include <new>
+
+//--------------------------------------------------------------------------------------
+// Non-product code
+
+#ifndef PRODUCT
+// The global operator new should never be called since it will usually indicate
+// a memory leak.  Use CHeapObj as the base class of such objects to make it explicit
+// that they're allocated on the C heap.
+// Commented out in product version to avoid conflicts with third-party C++ native code.
+//
+// In C++98/03 the throwing new operators are defined with the following signature:
+//
+// void* operator new(std::size_tsize) throw(std::bad_alloc);
+// void* operator new[](std::size_tsize) throw(std::bad_alloc);
+//
+// while all the other (non-throwing) new and delete operators are defined with an empty
+// throw clause (i.e. "operator delete(void* p) throw()") which means that they do not
+// throw any exceptions (see section 18.4 of the C++ standard).
+//
+// In the new C++11/14 standard, the signature of the throwing new operators was changed
+// by completely omitting the throw clause (which effectively means they could throw any
+// exception) while all the other new/delete operators where changed to have a 'nothrow'
+// clause instead of an empty throw clause.
+//
+// Unfortunately, the support for exception specifications among C++ compilers is still
+// very fragile. While some more strict compilers like AIX xlC or HP aCC reject to
+// override the default throwing new operator with a user operator with an empty throw()
+// clause, the MS Visual C++ compiler warns for every non-empty throw clause like
+// throw(std::bad_alloc) that it will ignore the exception specification. The following
+// operator definitions have been checked to correctly work with all currently supported
+// compilers and they should be upwards compatible with C++11/14. Therefore
+// PLEASE BE CAREFUL if you change the signature of the following operators!
+
+static void * zero = (void *) 0;
+
+void* operator new(size_t size) /* throw(std::bad_alloc) */ {
+  fatal("Should not call global operator new");
+  return zero;
+}
+
+void* operator new [](size_t size) /* throw(std::bad_alloc) */ {
+  fatal("Should not call global operator new[]");
+  return zero;
+}
+
+void* operator new(size_t size, const std::nothrow_t&  nothrow_constant) throw() {
+  fatal("Should not call global operator new");
+  return 0;
+}
+
+void* operator new [](size_t size, std::nothrow_t&  nothrow_constant) throw() {
+  fatal("Should not call global operator new[]");
+  return 0;
+}
+
+void operator delete(void* p) throw() {
+  fatal("Should not call global delete");
+}
+
+void operator delete [](void* p) throw() {
+  fatal("Should not call global delete []");
+}
+
+#endif // Non-product