Fixed issue with the MSVC++ build of Anope crashing on a DLL throwing an exception, thanks to w00t for pointing out the overloaded new/delete operators from InspIRCd.

git-svn-id: http://anope.svn.sourceforge.net/svnroot/anope/trunk@1838 5417fbe8-f217-4b02-8779-1006273d7864

1 files changed, 57 insertions, 0 deletions

diff --git a/src/win32_memory.cpp b/src/win32_memory.cpp
new file mode 100644
index 000000000..a83677eb2
--- /dev/null
+++ b/src/win32_memory.cpp
@@ -0,0 +1,57 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include <windows.h>
+#include <exception>
+#include <new>
+#include <new.h>
+
+/** On windows, all dll files and executables have their own private heap,
+ * whereas on POSIX systems, shared objects loaded into an executable share
+ * the executable's heap. This means that if we pass an arbitrary pointer to
+ * a windows DLL which is not allocated in that dll, without some form of
+ * marshalling, we get a page fault. To fix this, these overrided operators
+ * new and delete use the windows HeapAlloc and HeapFree functions to claim
+ * memory from the windows global heap. This makes windows 'act like' POSIX
+ * when it comes to memory usage between dlls and exes.
+ */
+
+void * ::operator new(size_t iSize)
+{
+	void *ptr = HeapAlloc(GetProcessHeap(), 0, iSize);		/* zero memory for unix compatibility */
+	/* This is the correct behaviour according to C++ standards for out of memory,
+	 * not returning null -- Brain
+	 */
+	if (!ptr)
+		throw std::bad_alloc();
+	else
+		return ptr;
+}
+
+void ::operator delete(void *ptr)
+{
+	HeapFree(GetProcessHeap(), 0, ptr);
+}
+
+void * operator new[](size_t iSize) {
+	void *ptr = HeapAlloc(GetProcessHeap(), 0, iSize); /* Why were we initializing the memory to zeros here? This is just a waste of cpu! */
+	if (!ptr)
+		throw std::bad_alloc();
+	else
+		return ptr;
+}
+
+void operator delete[](void *ptr)
+{
+	HeapFree(GetProcessHeap(), 0, ptr);
+}