debugability: Protect against invalid param num in trace_event macro

Introduce STATIC_ASSERT macro for compile-time verifications.

Signed-off-by: ArturX Kloniecki <arturx.kloniecki@linux.intel.com>

Author: akloniex

src/include/sof/sof.h

@@ -48,6 +48,12 @@ struct sa;
 #define PP_NARG(...) (sizeof((unsigned int[]){0, ##__VA_ARGS__}) \
 	/ sizeof(unsigned int) - 1)
 
+/* compile-time assertion */
+#define STATIC_ASSERT(COND, MESSAGE)	\
+	__attribute__((unused))		\
+	typedef char assertion_failed_##MESSAGE[(COND) ? 1 : -1]
+
+
 /* general firmware context */
 struct sof {
 	/* init data */

src/include/sof/trace.h

@@ -227,25 +227,28 @@ typedef void(*log_func)();
 		format					\
 	}
 
-#define BASE_LOG(function_name, entry, ...)			\
-{								\
-	log_func log_function = NULL;				\
-	if (PP_NARG(__VA_ARGS__) == 0) {			\
-		log_function = (log_func)&function_name##0;	\
-		log_function(entry, ##__VA_ARGS__);		\
-	} else if (PP_NARG(__VA_ARGS__) == 1) {			\
-		log_function = (log_func)&function_name##1;	\
-		log_function(entry, ##__VA_ARGS__);		\
-	} else if (PP_NARG(__VA_ARGS__) == 2) {			\
-		log_function = (log_func)&function_name##2;	\
-		log_function(entry, ##__VA_ARGS__);		\
-	} else if (PP_NARG(__VA_ARGS__) == 3) {			\
-		log_function = (log_func)&function_name##3;	\
-		log_function(entry, ##__VA_ARGS__);		\
-	} else if (PP_NARG(__VA_ARGS__) == 4) {			\
-		log_function = (log_func)&function_name##4;	\
-		log_function(entry, ##__VA_ARGS__);		\
-	}							\
+#define BASE_LOG(function_name, entry, ...)				\
+{									\
+	log_func log_function = NULL;					\
+	if (PP_NARG(__VA_ARGS__) == 0) {				\
+		log_function = (log_func)&function_name##0;		\
+		log_function(entry, ##__VA_ARGS__);			\
+	} else if (PP_NARG(__VA_ARGS__) == 1) {				\
+		log_function = (log_func)&function_name##1;		\
+		log_function(entry, ##__VA_ARGS__);			\
+	} else if (PP_NARG(__VA_ARGS__) == 2) {				\
+		log_function = (log_func)&function_name##2;		\
+		log_function(entry, ##__VA_ARGS__);			\
+	} else if (PP_NARG(__VA_ARGS__) == 3) {				\
+		log_function = (log_func)&function_name##3;		\
+		log_function(entry, ##__VA_ARGS__);			\
+	} else if (PP_NARG(__VA_ARGS__) == 4) {				\
+		log_function = (log_func)&function_name##4;		\
+		log_function(entry, ##__VA_ARGS__);			\
+	} else {							\
+		STATIC_ASSERT(PP_NARG(__VA_ARGS__) <= 4,		\
+			unsupported_amount_of_params_in_trace_event);	\
+	}								\
 }
 
 #define __log_message(func_name, lvl, comp_id, format, ...)		\