| 1 | /* |
| 2 | * Copyright (C) 2012 Christian Babeux <christian.babeux@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #ifdef NTESTPOINT |
| 9 | |
| 10 | #define testpoint(name) |
| 11 | #define TESTPOINT_DECL(name) |
| 12 | |
| 13 | #else /* NTESTPOINT */ |
| 14 | |
| 15 | #include <urcu.h> /* for caa_likely/unlikely */ |
| 16 | |
| 17 | extern int lttng_testpoint_activated; |
| 18 | |
| 19 | void *lttng_testpoint_lookup(const char *name); |
| 20 | |
| 21 | /* |
| 22 | * Testpoint is only active if the global lttng_testpoint_activated flag is |
| 23 | * set. |
| 24 | * Return a non-zero error code to indicate failure. |
| 25 | */ |
| 26 | #define testpoint(name) \ |
| 27 | ((caa_unlikely(lttng_testpoint_activated)) \ |
| 28 | ? __testpoint_##name##_wrapper() : 0) |
| 29 | |
| 30 | /* |
| 31 | * One wrapper per testpoint is generated. This is to keep track of the symbol |
| 32 | * lookup status and the corresponding function pointer, if any. |
| 33 | */ |
| 34 | #define _TESTPOINT_DECL(_name) \ |
| 35 | static inline int __testpoint_##_name##_wrapper(void) \ |
| 36 | { \ |
| 37 | int ret = 0; \ |
| 38 | static int (*tp)(void); \ |
| 39 | static int found; \ |
| 40 | const char *tp_name = "__testpoint_" #_name; \ |
| 41 | \ |
| 42 | if (tp) { \ |
| 43 | ret = tp(); \ |
| 44 | } else { \ |
| 45 | if (!found) { \ |
| 46 | tp = (int (*)(void)) lttng_testpoint_lookup(tp_name); \ |
| 47 | if (tp) { \ |
| 48 | found = 1; \ |
| 49 | ret = tp(); \ |
| 50 | } else { \ |
| 51 | found = -1; \ |
| 52 | } \ |
| 53 | } \ |
| 54 | } \ |
| 55 | return ret; \ |
| 56 | } |
| 57 | |
| 58 | /* Testpoint declaration */ |
| 59 | #define TESTPOINT_DECL(name) \ |
| 60 | _TESTPOINT_DECL(name) |
| 61 | |
| 62 | #endif /* NTESTPOINT */ |