Fixes that enables my_new.cc (new wrapper using my_malloc)

This is not enabled by default, as there are leaks in the
server that needs to be fixed first. One can compile
with -DUSE_MYSYS_NEW to find the memory leaks from
'new'. More comments can be found in mysys/my_new.cc

CMakeLists.txt

@@ -362,7 +362,8 @@ ENDIF()
 # Run platform tests
 INCLUDE(configure.cmake)
 
-# force -DUSE_MYSYS_NEW unless already done by HAVE_CXX_NEW
+# Use mysys/my_new.cc if '#include <new>'  doesn't work.
+# One can also specify -DUSE_MYSYS_NEW explicitly, see mysys/my_new.cc
 IF(NOT HAVE_CXX_NEW)
   ADD_DEFINITIONS(-DUSE_MYSYS_NEW)
 ENDIF()

mysys/my_new.cc

@@ -25,34 +25,55 @@
 #include "mysys_priv.h"
 #include <new>
 
-#ifdef USE_MYSYS_NEW
+/*
+  We don't yet enable the my new operators by default.
+  The reasons (for MariaDB) are:
+
+   - There are several global objects in plugins (wsrep_info, InnoDB,
+     tpool) that allocates data with 'new'. These objects are not
+     freed properly before exit() is called and safemalloc will report
+     these as lost memory.  The proper fix is to ensure that all plugins
+     either ensure that all objects frees there data or the global object are
+     changed to a pointer that as allocated and freed on demand.
+     Doing this will make it easier to find leaks and also speed up plugin
+     loads when we don't have to initialize a lot of objects until they
+     are really needed.
+  - Rocksdb calls malloc_usable_size, that will crash if used with new based
+    on my_malloc. One suggested fix would be to not define
+    ROCKSDB_MALLOC_USABLE_SIZE if MYSYS_USE_NEW is defined.
+
+    When the above is fixed, we can add enable ADD_DEFINITIONS(-DUSE_MYSYS_NEW)
+    in CMakeLists.txt
+*/
+
+#if defined(USE_MYSYS_NEW)
 
 void *operator new (size_t sz)
 {
-  return (void *) my_malloc (sz ? sz : 1, MYF(0));
+  return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
 }
 
 void *operator new[] (size_t sz)
 {
-  return (void *) my_malloc (sz ? sz : 1, MYF(0));
+  return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
 }
 
 void* operator new(std::size_t sz, const std::nothrow_t&) throw()
 {
-  return (void *) my_malloc (sz ? sz : 1, MYF(0));
+  return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
 }
 
 void* operator new[](std::size_t sz, const std::nothrow_t&) throw()
 {
-  return (void *) my_malloc (sz ? sz : 1, MYF(0));
+  return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
 }
 
-void operator delete (void *ptr, std::size_t)
+void operator delete (void *ptr, std::size_t) throw ()
 {
   my_free(ptr);
 }
 
-void operator delete (void *ptr)
+void operator delete (void *ptr) throw ()
 {
   my_free(ptr);
 }

mysys/my_static.c

@@ -48,6 +48,7 @@ PSI_memory_key key_memory_my_err_head;
 PSI_memory_key key_memory_my_file_info;
 PSI_memory_key key_memory_pack_frm;
 PSI_memory_key key_memory_charsets;
+PSI_memory_key key_memory_new= PSI_INSTRUMENT_MEM;
 
 #ifdef _WIN32
 PSI_memory_key key_memory_win_SECURITY_ATTRIBUTES;

mysys/mysys_priv.h

@@ -88,6 +88,7 @@ extern PSI_memory_key key_memory_my_err_head;
 extern PSI_memory_key key_memory_my_file_info;
 extern PSI_memory_key key_memory_pack_frm;
 extern PSI_memory_key key_memory_charsets;
+extern PSI_memory_key key_memory_new;
 
 #ifdef _WIN32
 extern PSI_memory_key key_memory_win_SECURITY_ATTRIBUTES;

mysys/safemalloc.c

@@ -39,8 +39,12 @@ static pthread_mutex_t sf_mutex;
 static int init_done= 0;
 
 #ifndef SF_REMEMBER_FRAMES
+#ifdef USE_MYSYS_NEW
+#define SF_REMEMBER_FRAMES 14
+#else
 #define SF_REMEMBER_FRAMES 8
-#endif
+#endif /* USE_MYSYS_NEW */
+#endif /* SF_REMEMBER_FRAMES */
 
 /* ignore the first two frames (sf_malloc itself, and my_malloc) */
 #define SF_FRAMES_SKIP          2