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e42130e9cd
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
117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
/* Copyright (c) 2000, 2001, 2003-2006 MySQL AB, 2009 Sun Microsystems, Inc.
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Use is subject to license terms.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/*
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This is a replacement of new/delete operators to be used when compiling
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with gcc 3.0.x to avoid including libstdc++
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It is also used to make all memory allocations to go through
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my_malloc/my_free wrappers (for debugging/safemalloc and accounting)
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*/
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#include "mysys_priv.h"
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#include <new>
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/*
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We don't yet enable the my new operators by default.
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The reasons (for MariaDB) are:
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- There are several global objects in plugins (wsrep_info, InnoDB,
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tpool) that allocates data with 'new'. These objects are not
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freed properly before exit() is called and safemalloc will report
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these as lost memory. The proper fix is to ensure that all plugins
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either ensure that all objects frees there data or the global object are
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changed to a pointer that as allocated and freed on demand.
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Doing this will make it easier to find leaks and also speed up plugin
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loads when we don't have to initialize a lot of objects until they
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are really needed.
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- Rocksdb calls malloc_usable_size, that will crash if used with new based
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on my_malloc. One suggested fix would be to not define
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ROCKSDB_MALLOC_USABLE_SIZE if MYSYS_USE_NEW is defined.
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When the above is fixed, we can add enable ADD_DEFINITIONS(-DUSE_MYSYS_NEW)
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in CMakeLists.txt
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*/
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#if defined(USE_MYSYS_NEW)
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void *operator new (size_t sz)
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{
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return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
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}
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void *operator new[] (size_t sz)
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{
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return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
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}
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void* operator new(std::size_t sz, const std::nothrow_t&) throw()
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{
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return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
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}
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void* operator new[](std::size_t sz, const std::nothrow_t&) throw()
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{
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return (void *) my_malloc(key_memory_new, sz ? sz : 1, MYF(0));
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}
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void operator delete (void *ptr, std::size_t) throw ()
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{
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my_free(ptr);
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}
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void operator delete (void *ptr) throw ()
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{
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my_free(ptr);
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}
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void operator delete[] (void *ptr) throw ()
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{
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my_free(ptr);
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}
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void operator delete[] (void *ptr, std::size_t) throw ()
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{
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my_free(ptr);
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}
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void operator delete(void* ptr, const std::nothrow_t&) throw()
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{
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my_free(ptr);
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}
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void operator delete[](void* ptr, const std::nothrow_t&) throw()
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{
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my_free(ptr);
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}
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C_MODE_START
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int __cxa_pure_virtual()
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{
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assert(! "Aborted: pure virtual method called.");
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return 0;
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}
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C_MODE_END
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#else
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/*
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Define a dummy symbol, just to avoid compiler/linker warnings
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about compiling an essentially empty file.
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*/
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int my_new_cc_symbol;
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#endif /* USE_MYSYS_NEW */
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