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db_include/utils/memdebug.h

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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) 1996-2021, 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)
+#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 */