include/ust-helper.h

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _LTTNG_UST_HELPER_H
   8 #define _LTTNG_UST_HELPER_H
   9
  10 #include <stdlib.h>
  11
  12 #include <lttng/ust-arch.h>
  13
  14 static inline __attribute__((always_inline))
  15 void *zmalloc(size_t len)
  16 {
  17         return calloc(len, 1);
  18 }
  19
  20 #define max_t(type, x, y)                               \
  21         ({                                              \
  22                 type __max1 = (x);                      \
  23                 type __max2 = (y);                      \
  24                 __max1 > __max2 ? __max1: __max2;       \
  25         })
  26
  27 #define min_t(type, x, y)                               \
  28         ({                                              \
  29                 type __min1 = (x);                      \
  30                 type __min2 = (y);                      \
  31                 __min1 <= __min2 ? __min1: __min2;      \
  32         })
  33
  34 #define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  35
  36 /*
  37  * Use of __builtin_return_address(0) sometimes seems to cause stack
  38  * corruption on 32-bit PowerPC. Disable this feature on that
  39  * architecture for now by always using the NULL value for the ip
  40  * context.
  41  */
  42 #if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
  43 #define LTTNG_UST_CALLER_IP()           NULL
  44 #else
  45 #define LTTNG_UST_CALLER_IP()           __builtin_return_address(0)
  46 #endif
  47
  48 #endif /* _LTTNG_UST_HELPER_H */