Add simple memory leak detector.

Can be enabled by configure option -enable-memdebug=yes.

Known issue: not all memory allocations hooked with it.

1 files changed, 183 insertions, 0 deletions

diff --git a/src/debug/debug_new.h b/src/debug/debug_new.h
new file mode 100644
index 000000000..5bcd06eb0
--- /dev/null
+++ b/src/debug/debug_new.h
@@ -0,0 +1,183 @@
+// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+// vim:tabstop=4:shiftwidth=4:expandtab:
+
+/*
+ * Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any
+ * damages arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must
+ *    not claim that you wrote the original software.  If you use this
+ *    software in a product, an acknowledgement in the product
+ *    documentation would be appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must
+ *    not be misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source
+ *    distribution.
+ *
+ * This file is part of Stones of Nvwa:
+ *      http://sourceforge.net/projects/nvwa
+ *
+ * original version changed for ManaPlus
+ *
+ * Copyright (C) 2011 ManaPlus developers
+ */
+
+/**
+ * @file    debug_new.h
+ *
+ * Header file for checking leaks caused by unmatched new/delete.
+ *
+ * @version 4.4, 2007/12/31
+ * @author  Wu Yongwei
+ *
+ */
+
+#ifndef _DEBUG_NEW_H
+#define _DEBUG_NEW_H
+
+#include <new>
+#include <stdio.h>
+
+/**
+ * @def HAVE_PLACEMENT_DELETE
+ *
+ * Macro to indicate whether placement delete operators are supported on
+ * a certain compiler.  Some compilers, like Borland C++ Compiler 5.5.1
+ * and Digital Mars Compiler 8.42, do not support them, and the user
+ * must define this macro to \c 0 to make the program compile.  Also
+ * note that in that case memory leakage will occur if an exception is
+ * thrown in the initialization (constructor) of a dynamically created
+ * object.
+ */
+#ifndef HAVE_PLACEMENT_DELETE
+#define HAVE_PLACEMENT_DELETE 1
+#endif
+
+/**
+ * @def _DEBUG_NEW_REDEFINE_NEW
+ *
+ * Macro to indicate whether redefinition of \c new is wanted.  If one
+ * wants to define one's own <code>operator new</code>, to call
+ * <code>operator new</code> directly, or to call placement \c new, it
+ * should be defined to \c 0 to alter the default behaviour.  Unless, of
+ * course, one is willing to take the trouble to write something like:
+ * @code
+ * # ifdef new
+ * #   define _NEW_REDEFINED
+ * #   undef new
+ * # endif
+ *
+ * // Code that uses new is here
+ *
+ * # ifdef _NEW_REDEFINED
+ * #   ifdef DEBUG_NEW
+ * #     define new DEBUG_NEW
+ * #   endif
+ * #   undef _NEW_REDEFINED
+ * # endif
+ * @endcode
+ */
+#ifndef _DEBUG_NEW_REDEFINE_NEW
+#define _DEBUG_NEW_REDEFINE_NEW 1
+#endif
+
+/* Prototypes */
+int check_leaks();
+int check_mem_corruption();
+void* operator new(size_t size, const char* file, int line);
+void* operator new[](size_t size, const char* file, int line);
+#if HAVE_PLACEMENT_DELETE
+void operator delete(void* pointer, const char* file, int line) throw();
+void operator delete[](void* pointer, const char* file, int line) throw();
+#endif
+#if defined(_MSC_VER) && _MSC_VER < 1300
+// MSVC 6 requires the following declarations; or the non-placement
+// new[]/delete[] will not compile.
+void* operator new[](size_t) throw(std::bad_alloc);
+void operator delete[](void*) throw();
+#endif
+
+/* Control variables */
+extern bool new_autocheck_flag; // default to true: call check_leaks() on exit
+extern bool new_verbose_flag;   // default to false: no verbose information
+extern FILE* new_output_fp;     // default to stderr: output to console
+extern const char* new_progname;// default to NULL; should be assigned argv[0]
+
+/**
+ * @def DEBUG_NEW
+ *
+ * Macro to catch file/line information on allocation.  If
+ * #_DEBUG_NEW_REDEFINE_NEW is \c 0, one can use this macro directly;
+ * otherwise \c new will be defined to it, and one must use \c new
+ * instead.
+ */
+#define DEBUG_NEW __debug_new_recorder(__FILE__, __LINE__) ->* new
+
+# if _DEBUG_NEW_REDEFINE_NEW
+#   define new DEBUG_NEW
+# endif
+# ifdef _DEBUG_NEW_EMULATE_MALLOC
+#   include <stdlib.h>
+#   ifdef new
+#     define malloc(s) ((void*)(new char[s]))
+#   else
+#     define malloc(s) ((void*)(DEBUG_NEW char[s]))
+#   endif
+#   define free(p) delete[] (char*)(p)
+#   define default_free free
+# endif
+
+/**
+ * Recorder class to remember the call context.
+ *
+ * The idea comes from <a href="http://groups.google.com/group/comp.lang.c++.moderated/browse_thread/thread/7089382e3bc1c489/85f9107a1dc79ee9?#85f9107a1dc79ee9">Greg Herlihy's post</a> in comp.lang.c++.moderated.
+ */
+class __debug_new_recorder
+{
+    const char* _M_file;
+    const int   _M_line;
+    void _M_process(void* pointer);
+public:
+    /**
+     * Constructor to remember the call context.  The information will
+     * be used in __debug_new_recorder::operator->*.
+     */
+    __debug_new_recorder(const char* file, int line)
+        : _M_file(file), _M_line(line) {}
+    /**
+     * Operator to write the context information to memory.
+     * <code>operator->*</code> is chosen because it has the right
+     * precedence, it is rarely used, and it looks good: so people can
+     * tell the special usage more quickly.
+     */
+    template <class _Tp> _Tp* operator->*(_Tp* pointer)
+    { _M_process(pointer); return pointer; }
+private:
+    __debug_new_recorder(const __debug_new_recorder&);
+    __debug_new_recorder& operator=(const __debug_new_recorder&);
+};
+
+/**
+ * Counter class for on-exit leakage check.
+ *
+ * This technique is learnt from <em>The C++ Programming Language</em> by
+ * Bjarne Stroustup.
+ */
+class __debug_new_counter
+{
+    static int _S_count;
+public:
+    __debug_new_counter();
+    ~__debug_new_counter();
+};
+/** Counting object for each file including debug_new.h. */
+static __debug_new_counter __debug_new_count;
+
+#endif // _DEBUG_NEW_H