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;
 }