Added macros to inform valgrind that memory is uninitialized

include/Makefile.am:
  Make my_valgrind.h global (as it's used by my_global.h)
include/my_global.h:
  Include my_valgrind.h
include/my_sys.h:
  TRASH() moved to my_valgrind.h
include/my_valgrind.h:
  Add VALGRIND defines to mark memory
mysys/my_alloc.c:
  Mark internal freed memory as undefined

include/Makefile.am

@@ -23,7 +23,7 @@ HEADERS_ABI =		mysql.h mysql_com.h mysql_time.h \
 pkginclude_HEADERS =	$(HEADERS_ABI) my_dbug.h m_string.h my_sys.h \
 			my_xml.h mysql_embed.h \
 		  	my_pthread.h my_no_pthread.h \
-			decimal.h errmsg.h my_global.h my_net.h \
+			decimal.h errmsg.h my_global.h my_valgrind.h my_net.h \
 			my_getopt.h sslopt-longopts.h my_dir.h \
 			sslopt-vars.h sslopt-case.h sql_common.h keycache.h \
 			m_ctype.h my_attribute.h $(HEADERS_GEN_CONFIGURE) \

include/my_global.h

@@ -566,18 +566,14 @@ int	__void__;
 #define LINT_INIT(var)
 #endif
 
+#include <my_valgrind.h>
+
 #if defined(_lint) || defined(FORCE_INIT_OF_VARS) || defined(HAVE_valgrind)
 #define VALGRIND_OR_LINT_INIT(var) var=0
 #else
 #define VALGRIND_OR_LINT_INIT(var)
 #endif
 
-#ifdef HAVE_valgrind
-#define IF_VALGRIND(A,B) (A)
-#else
-#define IF_VALGRIND(A,B) (B)
-#endif
-
 /* 
    Suppress uninitialized variable warning without generating code.
 

include/my_sys.h

@@ -145,7 +145,6 @@ extern int NEAR my_errno;		/* Last error in mysys */
 #define my_memdup(A,B,C) _my_memdup((A),(B), __FILE__,__LINE__,C)
 #define my_strdup(A,C) _my_strdup((A), __FILE__,__LINE__,C)
 #define my_strndup(A,B,C) _my_strndup((A),(B),__FILE__,__LINE__,C)
-
 #define QUICK_SAFEMALLOC sf_malloc_quick=1
 #define NORMAL_SAFEMALLOC sf_malloc_quick=0
 extern uint sf_malloc_prehunc,sf_malloc_endhunc,sf_malloc_quick;
@@ -173,7 +172,6 @@ extern char *my_strndup(const char *from, size_t length,
 #define CALLER_INFO_PROTO   /* nothing */
 #define CALLER_INFO         /* nothing */
 #define ORIG_CALLER_INFO    /* nothing */
-#define TRASH(A,B) /* nothing */
 #endif
 
 #if defined(ENABLED_DEBUG_SYNC)

include/my_valgrind.h

@@ -0,0 +1,38 @@
+/* Copyright (C) 2010 Monty Program Ab
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+
+/* Some defines to make it easier to use valgrind */
+
+#ifdef HAVE_valgrind
+#define IF_VALGRIND(A,B) (A)
+#else
+#define IF_VALGRIND(A,B) (B)
+#endif
+
+#if defined(HAVE_valgrind)&& defined(HAVE_VALGRIND_MEMCHECK_H)
+#include <valgrind/memcheck.h>
+#else
+#define VALGRIND_MAKE_MEM_DEFINED(addr, size) do { } while(0)
+#define VALGRIND_MAKE_MEM_NOACCESS(addr, size) do { } while(0)
+#ifdef SAFEMALLOC
+#define VALGRIND_MAKE_MEM_UNDEFINED(addr, size) bfill(addr, size, 0x8F)
+#else
+#define VALGRIND_MAKE_MEM_UNDEFINED(addr, size) do { } while(0)
+#endif /* SAFEMALLOC */
+#endif /* HAVE_valgrind */
+
+/* Compatibility with old source */
+#define TRASH(A,B) VALGRIND_MAKE_MEM_UNDEFINED(A, B)

mysys/my_alloc.c

@@ -21,7 +21,6 @@
 #undef EXTRA_DEBUG
 #define EXTRA_DEBUG
 
-
 /*
   Initialize memory root
 
@@ -276,7 +275,7 @@ void *multi_alloc_root(MEM_ROOT *root, ...)
   DBUG_RETURN((void*) start);
 }
 
-#define TRASH_MEM(X) TRASH(((char*)(X) + ((X)->size-(X)->left)), (X)->left)
+#define TRASH_MEM(X) VALGRIND_MAKE_MEM_UNDEFINED(((char*)(X) + ((X)->size-(X)->left)), (X)->left)
 
 /* Mark all data in blocks free for reusage */