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 #include <stdbool.h>
  12 #include <string.h>
  13
  14 #include <lttng/ust-arch.h>
  15
  16 /*
  17  * calloc() does not always populate the page table for the allocated
  18  * memory. Optionally enforce page table populate.
  19  */
  20 static inline
  21 void *zmalloc_populate(size_t len, bool populate)
  22         __attribute__((always_inline));
  23 static inline
  24 void *zmalloc_populate(size_t len, bool populate)
  25 {
  26         if (populate) {
  27                 void *ret = malloc(len);
  28                 if (ret == NULL)
  29                         return ret;
  30                 bzero(ret, len);
  31                 return ret;
  32         } else {
  33                 return calloc(len, 1);
  34         }
  35 }
  36
  37 /*
  38  * Memory allocation zeroed
  39  */
  40 static inline
  41 void *zmalloc(size_t len)
  42         __attribute__((always_inline));
  43 static inline
  44 void *zmalloc(size_t len)
  45 {
  46         return zmalloc_populate(len, false);
  47 }
  48
  49 #define max_t(type, x, y)                               \
  50         ({                                              \
  51                 type __max1 = (x);                      \
  52                 type __max2 = (y);                      \
  53                 __max1 > __max2 ? __max1: __max2;       \
  54         })
  55
  56 #define min_t(type, x, y)                               \
  57         ({                                              \
  58                 type __min1 = (x);                      \
  59                 type __min2 = (y);                      \
  60                 __min1 <= __min2 ? __min1: __min2;      \
  61         })
  62
  63 #define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  64
  65 /*
  66  * Use of __builtin_return_address(0) sometimes seems to cause stack
  67  * corruption on 32-bit PowerPC. Disable this feature on that
  68  * architecture for now by always using the NULL value for the ip
  69  * context.
  70  */
  71 #if defined(LTTNG_UST_ARCH_PPC) && !defined(LTTNG_UST_ARCH_PPC64)
  72 #define LTTNG_UST_CALLER_IP()           NULL
  73 #else
  74 #define LTTNG_UST_CALLER_IP()           __builtin_return_address(0)
  75 #endif
  76
  77 #endif /* _UST_COMMON_MACROS_H */