X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Fhelper.h;h=e529ba08bc5f2bd0e101e8dbdf5228eba62dd39d;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hp=b9448e3324febca1f1923b6ef01c53532529d36c;hpb=415dfaf718b209207bf492a5f9afa571f76d789c;p=lttng-ust.git

diff --git a/include/helper.h b/include/helper.h
index b9448e33..e529ba08 100644
--- a/include/helper.h
+++ b/include/helper.h
@@ -1,24 +1,12 @@
-#ifndef _LTTNG_UST_HELPER_H
-#define _LTTNG_UST_HELPER_H
-
 /*
- * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; version 2.1 of
- * the License.
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_UST_HELPER_H
+#define _LTTNG_UST_HELPER_H
+
 #include <stdlib.h>
 
 static inline __attribute__((always_inline))
@@ -41,4 +29,29 @@ void *zmalloc(size_t len)
 		__min1 <= __min2 ? __min1: __min2;	\
 	})
 
+#define LTTNG_ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+/*
+ * Use of __builtin_return_address(0) sometimes seems to cause stack
+ * corruption on 32-bit PowerPC. Disable this feature on that
+ * architecture for now by always using the NULL value for the ip
+ * context.
+ */
+#if defined(__PPC__) && !defined(__PPC64__)
+#define LTTNG_UST_CALLER_IP()		NULL
+#else /* #if defined(__PPC__) && !defined(__PPC64__) */
+#define LTTNG_UST_CALLER_IP()		__builtin_return_address(0)
+#endif /* #else #if defined(__PPC__) && !defined(__PPC64__) */
+
+/*
+ * LTTNG_HIDDEN: set the hidden attribute for internal functions
+ * On Windows, symbols are local unless explicitly exported,
+ * see https://gcc.gnu.org/wiki/Visibility
+ */
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define LTTNG_HIDDEN
+#else
+#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
 #endif /* _LTTNG_UST_HELPER_H */