Cleanup: ust-tracepoint-event.h: extract `__num_fields` in a variable

This makes it easier to understand what the `_TP_ARRAY_SIZE()` macro
expands to in this context.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I6b44e1e444df1dab0496282af4cea260ae895ca0

diff --git a/include/lttng/ust-tracepoint-event.h b/include/lttng/ust-tracepoint-event.h
index 0360bb6c6226ec0e81e780bb0c40b15b0da1fb9d..336125a6c4821507369ae932fd75d14484521bb4 100644 (file)
--- a/include/lttng/ust-tracepoint-event.h
+++ b/include/lttng/ust-tracepoint-event.h
@@ -781,9 +781,10 @@ void __event_probe__##_provider##___##_name(_TP_ARGS_DATA_PROTO(_args))          \
        struct lttng_stack_ctx __lttng_ctx;                                   \
        size_t __event_len, __event_align;                                    \
        size_t __dynamic_len_idx = 0;                                         \
+       const size_t __num_fields = _TP_ARRAY_SIZE(__event_fields___##_provider##___##_name) - 1; \
        union {                                                               \
-               size_t __dynamic_len[_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name) - 1]; \
-               char __filter_stack_data[2 * sizeof(unsigned long) * (_TP_ARRAY_SIZE(__event_fields___##_provider##___##_name) - 1)]; \
+               size_t __dynamic_len[__num_fields];                           \
+               char __filter_stack_data[2 * sizeof(unsigned long) * __num_fields]; \
        } __stackvar;                                                         \
        int __ret;                                                            \
                                                                              \