src/common/macros.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 _UST_COMMON_MACROS_H
   8 #define _UST_COMMON_MACROS_H
   9
  10 #include <stdlib.h>
  11
  12 #include <lttng/ust-arch.h>
  13
  14 /*
  15  * Memory allocation zeroed
  16  */
  17 static inline
  18 void *zmalloc(size_t len)
  19         __attribute__((always_inline));
  20 static inline
  21 void *zmalloc(size_t len)
  22 {
  23         return calloc(len, 1);
  24 }
  25
  26 #define max_t(type, x, y)                               \
  27         ({                                              \
  28                 type __max1 = (x);                      \
  29                 type __max2 = (y);                      \
  30                 __max1 > __max2 ? __max1: __max2;       \
  31         })
  32
  33 #define min_t(type, x, y)                               \
  34         ({                                              \
  35                 type __min1 = (x);                      \
  36                 type __min2 = (y);                      \
  37                 __min1 <= __min2 ? __min1: __min2;      \
  38         })
  39
  40 #define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  41
  42 /*
  43  * Use of __builtin_return_address(0) sometimes seems to cause stack
  44  * corruption on 32-bit PowerPC. Disable this feature on that
  45  * architecture for now by always using the NULL value for the ip
  46  * context.
  47  */
  48 #if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
  49 #define LTTNG_UST_CALLER_IP()           NULL
  50 #else
  51 #define LTTNG_UST_CALLER_IP()           __builtin_return_address(0)
  52 #endif
  53
  54 #endif /* _UST_COMMON_MACROS_H */