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/*-------------------------------------------------------------------------
*
* memdebug.h
* Memory debugging support.
*
* Currently, this file either wraps <valgrind/memcheck.h> or substitutes
* empty definitions for Valgrind client request macros we use.
*
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/memdebug.h
*
*-------------------------------------------------------------------------
*/
#ifndef MEMDEBUG_H
#define MEMDEBUG_H
#ifdef USE_VALGRIND
#include <valgrind/memcheck.h>
#else
#define VALGRIND_CHECK_MEM_IS_DEFINED(addr, size) do {} while (0)
#define VALGRIND_CREATE_MEMPOOL(context, redzones, zeroed) do {} while (0)
#define VALGRIND_DESTROY_MEMPOOL(context) do {} while (0)
#define VALGRIND_MAKE_MEM_DEFINED(addr, size) do {} while (0)
#define VALGRIND_MAKE_MEM_NOACCESS(addr, size) do {} while (0)
#define VALGRIND_MAKE_MEM_UNDEFINED(addr, size) do {} while (0)
#define VALGRIND_MEMPOOL_ALLOC(context, addr, size) do {} while (0)
#define VALGRIND_MEMPOOL_FREE(context, addr) do {} while (0)
#define VALGRIND_MEMPOOL_CHANGE(context, optr, nptr, size) do {} while (0)
#define VALGRIND_MEMPOOL_TRIM(context, addr, size) do {} while (0)
#endif
#ifdef CLOBBER_FREED_MEMORY
/* Wipe freed memory for debugging purposes */
static inline void
wipe_mem(void *ptr, size_t size)
{
VALGRIND_MAKE_MEM_UNDEFINED(ptr, size);
memset(ptr, 0x7F, size);
VALGRIND_MAKE_MEM_NOACCESS(ptr, size);
}
#endif /* CLOBBER_FREED_MEMORY */
#ifdef MEMORY_CONTEXT_CHECKING
static inline void
set_sentinel(void *base, Size offset)
{
char *ptr = (char *) base + offset;
VALGRIND_MAKE_MEM_UNDEFINED(ptr, 1);
*ptr = 0x7E;
VALGRIND_MAKE_MEM_NOACCESS(ptr, 1);
}
static inline bool
sentinel_ok(const void *base, Size offset)
{
const char *ptr = (const char *) base + offset;
bool ret;
VALGRIND_MAKE_MEM_DEFINED(ptr, 1);
ret = *ptr == 0x7E;
VALGRIND_MAKE_MEM_NOACCESS(ptr, 1);
return ret;
}
#endif /* MEMORY_CONTEXT_CHECKING */
#ifdef RANDOMIZE_ALLOCATED_MEMORY
void randomize_mem(char *ptr, size_t size);
#endif /* RANDOMIZE_ALLOCATED_MEMORY */
#endif /* MEMDEBUG_H */
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