Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * memdebug.h
4 : * Memory debugging support.
5 : *
6 : * Currently, this file either wraps <valgrind/memcheck.h> or substitutes
7 : * empty definitions for Valgrind client request macros we use.
8 : *
9 : *
10 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
11 : * Portions Copyright (c) 1994, Regents of the University of California
12 : *
13 : * src/include/utils/memdebug.h
14 : *
15 : *-------------------------------------------------------------------------
16 : */
17 : #ifndef MEMDEBUG_H
18 : #define MEMDEBUG_H
19 :
20 : #ifdef USE_VALGRIND
21 : #include <valgrind/memcheck.h>
22 : #else
23 : #define VALGRIND_CHECK_MEM_IS_DEFINED(addr, size) do {} while (0)
24 : #define VALGRIND_CREATE_MEMPOOL(context, redzones, zeroed) do {} while (0)
25 : #define VALGRIND_DESTROY_MEMPOOL(context) do {} while (0)
26 : #define VALGRIND_MAKE_MEM_DEFINED(addr, size) do {} while (0)
27 : #define VALGRIND_MAKE_MEM_NOACCESS(addr, size) do {} while (0)
28 : #define VALGRIND_MAKE_MEM_UNDEFINED(addr, size) do {} while (0)
29 : #define VALGRIND_MEMPOOL_ALLOC(context, addr, size) do {} while (0)
30 : #define VALGRIND_MEMPOOL_FREE(context, addr) do {} while (0)
31 : #define VALGRIND_MEMPOOL_CHANGE(context, optr, nptr, size) do {} while (0)
32 : #define VALGRIND_MEMPOOL_TRIM(context, addr, size) do {} while (0)
33 : #endif
34 :
35 :
36 : #ifdef CLOBBER_FREED_MEMORY
37 :
38 : /* Wipe freed memory for debugging purposes */
39 : static inline void
3113 andres@anarazel.de 40 CBC 273718752 : wipe_mem(void *ptr, size_t size)
41 : {
42 : VALGRIND_MAKE_MEM_UNDEFINED(ptr, size);
43 273718752 : memset(ptr, 0x7F, size);
44 : VALGRIND_MAKE_MEM_NOACCESS(ptr, size);
45 273718752 : }
46 :
47 : #endif /* CLOBBER_FREED_MEMORY */
48 :
49 : #ifdef MEMORY_CONTEXT_CHECKING
50 :
51 : static inline void
52 366844263 : set_sentinel(void *base, Size offset)
53 : {
54 366844263 : char *ptr = (char *) base + offset;
55 :
56 : VALGRIND_MAKE_MEM_UNDEFINED(ptr, 1);
57 366844263 : *ptr = 0x7E;
58 : VALGRIND_MAKE_MEM_NOACCESS(ptr, 1);
59 366844263 : }
60 :
61 : static inline bool
62 1884376180 : sentinel_ok(const void *base, Size offset)
63 : {
64 1884376180 : const char *ptr = (const char *) base + offset;
65 : bool ret;
66 :
67 : VALGRIND_MAKE_MEM_DEFINED(ptr, 1);
68 1884376180 : ret = *ptr == 0x7E;
69 : VALGRIND_MAKE_MEM_NOACCESS(ptr, 1);
70 :
71 1884376180 : return ret;
72 : }
73 :
74 : #endif /* MEMORY_CONTEXT_CHECKING */
75 :
76 : #ifdef RANDOMIZE_ALLOCATED_MEMORY
77 :
78 : void randomize_mem(char *ptr, size_t size);
79 :
80 : #endif /* RANDOMIZE_ALLOCATED_MEMORY */
81 :
82 :
83 : #endif /* MEMDEBUG_H */
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