linux-kernel - Re: [RFC][PATCH 06/17 v3] tracing: Add TRACE_DEFINE_ENUM() macro to map enums to their values

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Date:	Thu, 2 Apr 2015 12:25:11 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Guilherme Cox <cox@...puter.org>,
	Tony Luck <tony.luck@...il.com>,
	Xie XiuQi <xiexiuqi@...wei.com>
Subject: Re: [RFC][PATCH 06/17 v3] tracing: Add TRACE_DEFINE_ENUM() macro to
 map enums to their values


I updated the function to handle structures that were saved as well.
Just in case something like REC->my_enum does not get converted.

Also, I found that I never needed to decrement the pointer for those
locations that I did so.

Here's the new function:

static void update_event_printk(struct ftrace_event_call *call,
				struct trace_enum_map *map)
{
	char *ptr;
	int quote = 0;
	int len = strlen(map->enum_string);

	for (ptr = call->print_fmt; *ptr; ptr++) {
		if (*ptr == '\\') {
			ptr++;
			/* paranoid */
			if (!*ptr)
				break;
			continue;
		}
		if (*ptr == '"') {
			quote ^= 1;
			continue;
		}
		if (quote)
			continue;
		if (isdigit(*ptr)) {
			/* skip numbers */
			do {
				ptr++;
				/* Check for alpha chars like ULL */
			} while (isalnum(*ptr));
			/*
			 * A number must have some kind of delimiter after
			 * it, and we can ignore that too.
			 */
			continue;
		}
		if (isalpha(*ptr) || *ptr == '_') {
			if (strncmp(map->enum_string, ptr, len) == 0 &&
			    !isalnum(ptr[len]) && ptr[len] != '_') {
				ptr = enum_replace(ptr, map, len);
				/* Hmm, enum string smaller than value */
				if (WARN_ON_ONCE(!ptr))
					return;
				/*
				 * No need to decrement here, as enum_replace()
				 * returns the pointer to the character passed
				 * the enum, and two enums can not be placed
				 * back to back without something in between.
				 * We can skip that something in between.
				 */
				continue;
			}
		skip_more:
			do {
				ptr++;
			} while (isalnum(*ptr) || *ptr == '_');
			/*
			 * If what comes after this variable is a '.' or
			 * '->' then we can continue to ignore that string.
			 */
			if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) {
				ptr += *ptr == '.' ? 1 : 2;
				goto skip_more;
			}
			/*
			 * Once again, we can skip the delimiter that came
			 * after the string.
			 */
			continue;
		}
	}
}

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