Add extra/barectf-tracepoint.h (tracepoint() macro wrapper)

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>

diff --git a/extra/barectf-tracepoint.h b/extra/barectf-tracepoint.h
new file mode 100644 (file)
index 0000000..fb49a70
--- /dev/null
+++ b/extra/barectf-tracepoint.h
@@ -0,0 +1,70 @@
+#ifndef _BARECTF_TRACEPOINT_H
+#define _BARECTF_TRACEPOINT_H
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Philippe Proulx <pproulx@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* get prefix */
+#ifdef BARECTF_TRACEPOINT_PREFIX
+# define _BARECTF_TRACEPOINT_PREFIX BARECTF_TRACEPOINT_PREFIX
+#else
+# ifdef _BARECTF_PREFIX
+#  define _BARECTF_TRACEPOINT_PREFIX _BARECTF_PREFIX
+# else
+#  error You need to define BARECTF_TRACEPOINT_PREFIX in order to use this header.
+# endif
+#endif
+
+/* get stream name to use */
+#ifdef BARECTF_TRACEPOINT_STREAM
+# define _BARECTF_TRACEPOINT_STREAM BARECTF_TRACEPOINT_STREAM
+#else
+# ifdef _BARECTF_DEFAULT_STREAM
+#  define _BARECTF_TRACEPOINT_STREAM _BARECTF_DEFAULT_STREAM
+# else
+#  error You need to define BARECTF_TRACEPOINT_STREAM in order to use this header.
+# endif
+#endif
+
+/* get context to use */
+#ifndef BARECTF_TRACEPOINT_CTX
+# error You need to define BARECTF_TRACEPOINT_CTX in order to use this header.
+#endif
+
+/*
+ * Combines 6 token. Inspired by __TP_COMBINE_TOKENS4() in
+ * <lttng/tracepoint.h>. See sections 6.10.3 and 6.10.3.1 of
+ * ISO/IEC 9899:1999.
+ */
+#define __COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
+       _a ## _b ## _c ## _d ## _e ## _f
+#define _COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f) \
+       __COMBINE_TOKENS6(_a, _b, _c, _d, _e, _f)
+
+/* tracepoint() used by the user */
+#undef tracepoint
+#define tracepoint(_prov_name, _tp_name, ...) \
+       _COMBINE_TOKENS6(_BARECTF_TRACEPOINT_PREFIX, _BARECTF_TRACEPOINT_STREAM, _trace_, _prov_name, _, _tp_name)(BARECTF_TRACEPOINT_CTX, ##__VA_ARGS__)
+
+#endif /* _BARECTF_TRACEPOINT_H */