Use 'ust-' prefix for all global private headers

[lttng-ust.git] / include / ust-helper.h

diff --git a/include/ust-helper.h b/include/ust-helper.h
new file mode 100644 (file)
index 0000000..e529ba0
--- /dev/null
+++ b/include/ust-helper.h
@@ -0,0 +1,57 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * 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))
+void *zmalloc(size_t len)
+{
+       return calloc(len, 1);
+}
+
+#define max_t(type, x, y)                              \
+       ({                                              \
+               type __max1 = (x);                      \
+               type __max2 = (y);                      \
+               __max1 > __max2 ? __max1: __max2;       \
+       })
+
+#define min_t(type, x, y)                              \
+       ({                                              \
+               type __min1 = (x);                      \
+               type __min2 = (y);                      \
+               __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 */