1 | #if defined(OS_LINUX) |
2 | #include <stdlib.h> |
3 | |
4 | /// Interposing these symbols explicitly. The idea works like this: malloc.cpp compiles to a |
5 | /// dedicated object (namely clickhouse_malloc.o), and it will show earlier in the link command |
6 | /// than malloc libs like libjemalloc.a. As a result, these symbols get picked in time right after. |
7 | |
8 | #pragma GCC diagnostic push |
9 | #pragma GCC diagnostic ignored "-Wredundant-decls" |
10 | extern "C" |
11 | { |
12 | void *malloc(size_t size); |
13 | void free(void *ptr); |
14 | void *calloc(size_t nmemb, size_t size); |
15 | void *realloc(void *ptr, size_t size); |
16 | int posix_memalign(void **memptr, size_t alignment, size_t size); |
17 | void *aligned_alloc(size_t alignment, size_t size); |
18 | void *valloc(size_t size); |
19 | void *memalign(size_t alignment, size_t size); |
20 | void *pvalloc(size_t size); |
21 | } |
22 | #pragma GCC diagnostic pop |
23 | |
24 | template<typename T> |
25 | inline void ignore(T x __attribute__((unused))) |
26 | { |
27 | } |
28 | |
29 | static void dummyFunctionForInterposing() __attribute__((used)); |
30 | static void dummyFunctionForInterposing() |
31 | { |
32 | void* dummy; |
33 | /// Suppression for PVS-Studio. |
34 | free(nullptr); // -V575 |
35 | ignore(malloc(0)); // -V575 |
36 | ignore(calloc(0, 0)); // -V575 |
37 | ignore(realloc(nullptr, 0)); // -V575 |
38 | ignore(posix_memalign(&dummy, 0, 0)); // -V575 |
39 | ignore(aligned_alloc(0, 0)); // -V575 |
40 | ignore(valloc(0)); // -V575 |
41 | ignore(memalign(0, 0)); // -V575 |
42 | ignore(pvalloc(0)); // -V575 |
43 | } |
44 | #endif |
45 | |