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/* Copyright (c) 2017, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mysql/components/library_mysys/my_memory.h"
#include <assert.h>
#include <stdlib.h>
#include "mysql/components/services/psi_memory.h"
#ifdef HAVE_VALGRIND
#include <valgrind/valgrind.h>
#define MEM_MALLOCLIKE_BLOCK(p1, p2, p3, p4) \
VALGRIND_MALLOCLIKE_BLOCK(p1, p2, p3, p4)
#define MEM_FREELIKE_BLOCK(p1, p2) VALGRIND_FREELIKE_BLOCK(p1, p2)
#else /* HAVE_VALGRIND */
#define MEM_MALLOCLIKE_BLOCK(p1, p2, p3, p4) \
do { \
} while (0)
#define MEM_FREELIKE_BLOCK(p1, p2) \
do { \
} while (0)
#endif /* HAVE_VALGRIND */
#define HEADER_SIZE 32
#define MAGIC 1234
#define USER_TO_HEADER(P) ((my_memory_header *)(((char *)P) - HEADER_SIZE))
#define HEADER_TO_USER(P) (((char *)P) + HEADER_SIZE)
struct my_memory_header {
PSI_memory_key m_key;
unsigned int m_magic;
size_t m_size;
PSI_thread *m_owner;
};
typedef struct my_memory_header my_memory_header;
extern "C" void *my_malloc(PSI_memory_key key, size_t size, int flags) {
my_memory_header *mh;
size_t raw_size;
static_assert(sizeof(my_memory_header) <= HEADER_SIZE,
"We must reserve enough memory to hold the header.");
raw_size = HEADER_SIZE + size;
if (flags & MY_ZEROFILL)
mh = (my_memory_header *)calloc(raw_size, 1);
else
mh = (my_memory_header *)malloc(raw_size);
if (mh != nullptr) {
void *user_ptr;
mh->m_magic = MAGIC;
mh->m_size = size;
mh->m_key = PSI_MEMORY_CALL(memory_alloc)(key, size, &mh->m_owner);
user_ptr = HEADER_TO_USER(mh);
MEM_MALLOCLIKE_BLOCK(user_ptr, size, 0, (flags & MY_ZEROFILL));
return user_ptr;
}
return nullptr;
}
extern "C" void my_free(void *ptr) {
my_memory_header *mh;
if (ptr == nullptr) return;
mh = USER_TO_HEADER(ptr);
assert(mh->m_magic == MAGIC);
PSI_MEMORY_CALL(memory_free)(mh->m_key, mh->m_size, mh->m_owner);
/* Catch double free */
mh->m_magic = 0xDEAD;
MEM_FREELIKE_BLOCK(ptr, 0);
free(mh);
}
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