perf probe: Move probe event utility functions to probe-event.c

Split probe event (kprobe-events and perf probe events) utility
functions from builtin-probe.c to probe-event.c.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091201001958.10235.90243.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 218 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 5f47e624e57e..bf20df2e816d 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -40,6 +40,7 @@
 #include "util/parse-options.h"
 #include "util/parse-events.h"	/* For debugfs_path */
 #include "util/probe-finder.h"
+#include "util/probe-event.h"
 
 /* Default vmlinux search paths */
 #define NR_SEARCH_PATH 3
@@ -51,8 +52,6 @@ const char *default_search_path[NR_SEARCH_PATH] = {
 
 #define MAX_PATH_LEN 256
 #define MAX_PROBES 128
-#define MAX_PROBE_ARGS 128
-#define PERFPROBE_GROUP "probe"
 
 /* Session management structure */
 static struct {
@@ -63,155 +62,17 @@ static struct {
 	struct probe_point probes[MAX_PROBES];
 } session;
 
-#define semantic_error(msg ...) die("Semantic error :" msg)
-
-/* Parse probe point. Return 1 if return probe */
-static void parse_probe_point(char *arg, struct probe_point *pp)
-{
-	char *ptr, *tmp;
-	char c, nc = 0;
-	/*
-	 * <Syntax>
-	 * perf probe SRC:LN
-	 * perf probe FUNC[+OFFS|%return][@SRC]
-	 */
-
-	ptr = strpbrk(arg, ":+@%");
-	if (ptr) {
-		nc = *ptr;
-		*ptr++ = '\0';
-	}
-
-	/* Check arg is function or file and copy it */
-	if (strchr(arg, '.'))	/* File */
-		pp->file = strdup(arg);
-	else			/* Function */
-		pp->function = strdup(arg);
-	DIE_IF(pp->file == NULL && pp->function == NULL);
-
-	/* Parse other options */
-	while (ptr) {
-		arg = ptr;
-		c = nc;
-		ptr = strpbrk(arg, ":+@%");
-		if (ptr) {
-			nc = *ptr;
-			*ptr++ = '\0';
-		}
-		switch (c) {
-		case ':':	/* Line number */
-			pp->line = strtoul(arg, &tmp, 0);
-			if (*tmp != '\0')
-				semantic_error("There is non-digit charactor"
-						" in line number.");
-			break;
-		case '+':	/* Byte offset from a symbol */
-			pp->offset = strtoul(arg, &tmp, 0);
-			if (*tmp != '\0')
-				semantic_error("There is non-digit charactor"
-						" in offset.");
-			break;
-		case '@':	/* File name */
-			if (pp->file)
-				semantic_error("SRC@SRC is not allowed.");
-			pp->file = strdup(arg);
-			DIE_IF(pp->file == NULL);
-			if (ptr)
-				semantic_error("@SRC must be the last "
-					       "option.");
-			break;
-		case '%':	/* Probe places */
-			if (strcmp(arg, "return") == 0) {
-				pp->retprobe = 1;
-			} else	/* Others not supported yet */
-				semantic_error("%%%s is not supported.", arg);
-			break;
-		default:
-			DIE_IF("Program has a bug.");
-			break;
-		}
-	}
-
-	/* Exclusion check */
-	if (pp->line && pp->offset)
-		semantic_error("Offset can't be used with line number.");
-	if (!pp->line && pp->file && !pp->function)
-		semantic_error("File always requires line number.");
-	if (pp->offset && !pp->function)
-		semantic_error("Offset requires an entry function.");
-	if (pp->retprobe && !pp->function)
-		semantic_error("Return probe requires an entry function.");
-	if ((pp->offset || pp->line) && pp->retprobe)
-		semantic_error("Offset/Line can't be used with return probe.");
-
-	pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n",
-		 pp->function, pp->file, pp->line, pp->offset, pp->retprobe);
-}
-
 /* Parse an event definition. Note that any error must die. */
 static void parse_probe_event(const char *str)
 {
-	char *argv[MAX_PROBE_ARGS + 1];	/* probe + args */
-	int argc, i;
 	struct probe_point *pp = &session.probes[session.nr_probe];
 
 	pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
 	if (++session.nr_probe == MAX_PROBES)
-		semantic_error("Too many probes");
-
-	/* Separate arguments, similar to argv_split */
-	argc = 0;
-	do {
-		/* Skip separators */
-		while (isspace(*str))
-			str++;
-
-		/* Add an argument */
-		if (*str != '\0') {
-			const char *s = str;
-			/* Check the limit number of arguments */
-			if (argc == MAX_PROBE_ARGS + 1)
-				semantic_error("Too many arguments");
-
-			/* Skip the argument */
-			while (!isspace(*str) && *str != '\0')
-				str++;
-
-			/* Duplicate the argument */
-			argv[argc] = strndup(s, str - s);
-			if (argv[argc] == NULL)
-				die("strndup");
-			pr_debug("argv[%d]=%s\n", argc, argv[argc]);
-			argc++;
-
-		}
-	} while (*str != '\0');
-	if (!argc)
-		semantic_error("An empty argument.");
-
-	/* Parse probe point */
-	parse_probe_point(argv[0], pp);
-	free(argv[0]);
-	if (pp->file || pp->line)
-		session.need_dwarf = 1;
-
-	/* Copy arguments */
-	pp->nr_args = argc - 1;
-	if (pp->nr_args > 0) {
-		pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
-		if (!pp->args)
-			die("malloc");
-		memcpy(pp->args, &argv[1], sizeof(char *) * pp->nr_args);
-	}
+		die("Too many probes (> %d) are specified.", MAX_PROBES);
 
-	/* Ensure return probe has no C argument */
-	for (i = 0; i < pp->nr_args; i++)
-		if (is_c_varname(pp->args[i])) {
-			if (pp->retprobe)
-				semantic_error("You can't specify local"
-						" variable for kretprobe");
-			session.need_dwarf = 1;
-		}
+	/* Parse perf-probe event into probe_point */
+	session.need_dwarf = parse_perf_probe_event(str, pp);
 
 	pr_debug("%d arguments\n", pp->nr_args);
 }
@@ -288,59 +149,15 @@ static const struct option options[] = {
 		"\t\tALN:\tAbsolute line number in file.\n"
 		"\t\tARG:\tProbe argument (local variable name or\n"
 #endif
-		"\t\t\tkprobe-tracer argument format is supported.)\n",
+		"\t\t\tkprobe-tracer argument format.)\n",
 		opt_add_probe_event),
 	OPT_END()
 };
 
-static int write_new_event(int fd, const char *buf)
-{
-	int ret;
-
-	ret = write(fd, buf, strlen(buf));
-	if (ret <= 0)
-		die("Failed to create event.");
-	else
-		printf("Added new event: %s\n", buf);
-
-	return ret;
-}
-
-#define MAX_CMDLEN 256
-
-static int synthesize_probe_event(struct probe_point *pp)
-{
-	char *buf;
-	int i, len, ret;
-	pp->probes[0] = buf = zalloc(MAX_CMDLEN);
-	if (!buf)
-		die("Failed to allocate memory by zalloc.");
-	ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
-	if (ret <= 0 || ret >= MAX_CMDLEN)
-		goto error;
-	len = ret;
-
-	for (i = 0; i < pp->nr_args; i++) {
-		ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
-			       pp->args[i]);
-		if (ret <= 0 || ret >= MAX_CMDLEN - len)
-			goto error;
-		len += ret;
-	}
-	pp->found = 1;
-	return pp->found;
-error:
-	free(pp->probes[0]);
-	if (ret > 0)
-		ret = -E2BIG;
-	return ret;
-}
-
 int cmd_probe(int argc, const char **argv, const char *prefix __used)
 {
 	int i, j, fd, ret;
 	struct probe_point *pp;
-	char buf[MAX_CMDLEN];
 
 	argc = parse_options(argc, argv, options, probe_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
@@ -352,7 +169,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
 
 	if (session.need_dwarf)
 #ifdef NO_LIBDWARF
-		semantic_error("Debuginfo-analysis is not supported");
+		die("Debuginfo-analysis is not supported");
 #else	/* !NO_LIBDWARF */
 		pr_debug("Some probes require debuginfo.\n");
 
@@ -398,41 +215,15 @@ end_dwarf:
 		if (pp->found)	/* This probe is already found. */
 			continue;
 
-		ret = synthesize_probe_event(pp);
+		ret = synthesize_trace_kprobe_event(pp);
 		if (ret == -E2BIG)
-			semantic_error("probe point is too long.");
+			die("probe point definition becomes too long.");
 		else if (ret < 0)
 			die("Failed to synthesize a probe point.");
 	}
 
 	/* Settng up probe points */
-	snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
-	fd = open(buf, O_WRONLY, O_APPEND);
-	if (fd < 0) {
-		if (errno == ENOENT)
-			die("kprobe_events file does not exist - please rebuild with CONFIG_KPROBE_TRACER.");
-		else
-			die("Could not open kprobe_events file: %s",
-			    strerror(errno));
-	}
-	for (j = 0; j < session.nr_probe; j++) {
-		pp = &session.probes[j];
-		if (pp->found == 1) {
-			snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n",
-				pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP,
-				pp->function, pp->offset, pp->probes[0]);
-			write_new_event(fd, buf);
-		} else
-			for (i = 0; i < pp->found; i++) {
-				snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n",
-					pp->retprobe ? 'r' : 'p',
-					PERFPROBE_GROUP,
-					pp->function, pp->offset, i,
-					pp->probes[i]);
-				write_new_event(fd, buf);
-			}
-	}
-	close(fd);
+	add_trace_kprobe_events(session.probes, session.nr_probe);
 	return 0;
 }