2 files changed, 261 insertions, 5 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index a7750256c408..e96bb534b948 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -6,6 +6,46 @@
 #include "util/thread.h"
 #include "util/header.h"
 
+static char const               *script_name;
+static char const               *generate_script_lang;
+
+static int default_start_script(const char *script __attribute((unused)))
+{
+        return 0;
+}
+
+static int default_stop_script(void)
+{
+        return 0;
+}
+
+static int default_generate_script(const char *outfile __attribute ((unused)))
+{
+        return 0;
+}
+
+static struct scripting_ops default_scripting_ops = {
+        .start_script           = default_start_script,
+        .stop_script            = default_stop_script,
+        .process_event          = print_event,
+        .generate_script        = default_generate_script,
+};
+
+static struct scripting_ops     *scripting_ops;
+
+static void setup_scripting(void)
+{
+        /* make sure PERF_EXEC_PATH is set for scripts */
+        perf_set_argv_exec_path(perf_exec_path());
+
+        scripting_ops = &default_scripting_ops;
+}
+
+static int cleanup_scripting(void)
+{
+        return scripting_ops->stop_script();
+}
+
 #include "util/parse-options.h"
 
 #include "perf.h"
@@ -13,11 +53,12 @@
 
 #include "util/trace-event.h"
 #include "util/data_map.h"
+#include "util/exec_cmd.h"
 
-static char             const *input_name = "perf.data";
+static char const               *input_name = "perf.data";
 
-static struct perf_header *header;
-static u64              sample_type;
+static struct perf_header       *header;
+static u64                      sample_type;
 
 static int process_sample_event(event_t *event)
 {
@@ -69,7 +110,8 @@ static int process_sample_event(event_t *event)
                  * field, although it should be the same than this perf
                  * event pid
                  */
-                print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
+                scripting_ops->process_event(cpu, raw->data, raw->size,
+                                             timestamp, thread->comm);
         }
         event__stats.total += period;
 
@@ -105,6 +147,154 @@ static int __cmd_trace(void)
                                        0, 0, &event__cwdlen, &event__cwd);
 }
 
+struct script_spec {
+        struct list_head        node;
+        struct scripting_ops    *ops;
+        char                    spec[0];
+};
+
+LIST_HEAD(script_specs);
+
+static struct script_spec *script_spec__new(const char *spec,
+                                            struct scripting_ops *ops)
+{
+        struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
+
+        if (s != NULL) {
+                strcpy(s->spec, spec);
+                s->ops = ops;
+        }
+
+        return s;
+}
+
+static void script_spec__delete(struct script_spec *s)
+{
+        free(s->spec);
+        free(s);
+}
+
+static void script_spec__add(struct script_spec *s)
+{
+        list_add_tail(&s->node, &script_specs);
+}
+
+static struct script_spec *script_spec__find(const char *spec)
+{
+        struct script_spec *s;
+
+        list_for_each_entry(s, &script_specs, node)
+                if (strcasecmp(s->spec, spec) == 0)
+                        return s;
+        return NULL;
+}
+
+static struct script_spec *script_spec__findnew(const char *spec,
+                                                struct scripting_ops *ops)
+{
+        struct script_spec *s = script_spec__find(spec);
+
+        if (s)
+                return s;
+
+        s = script_spec__new(spec, ops);
+        if (!s)
+                goto out_delete_spec;
+
+        script_spec__add(s);
+
+        return s;
+
+out_delete_spec:
+        script_spec__delete(s);
+
+        return NULL;
+}
+
+int script_spec_register(const char *spec, struct scripting_ops *ops)
+{
+        struct script_spec *s;
+
+        s = script_spec__find(spec);
+        if (s)
+                return -1;
+
+        s = script_spec__findnew(spec, ops);
+        if (!s)
+                return -1;
+
+        return 0;
+}
+
+static struct scripting_ops *script_spec__lookup(const char *spec)
+{
+        struct script_spec *s = script_spec__find(spec);
+        if (!s)
+                return NULL;
+
+        return s->ops;
+}
+
+static void list_available_languages(void)
+{
+        struct script_spec *s;
+
+        fprintf(stderr, "\n");
+        fprintf(stderr, "Scripting language extensions (used in "
+                "perf trace -s [spec:]script.[spec]):\n\n");
+
+        list_for_each_entry(s, &script_specs, node)
+                fprintf(stderr, "  %-42s [%s]\n", s->spec, s->ops->name);
+
+        fprintf(stderr, "\n");
+}
+
+static int parse_scriptname(const struct option *opt __used,
+                            const char *str, int unset __used)
+{
+        char spec[PATH_MAX];
+        const char *script, *ext;
+        int len;
+
+        if (strcmp(str, "list") == 0) {
+                list_available_languages();
+                return 0;
+        }
+
+        script = strchr(str, ':');
+        if (script) {
+                len = script - str;
+                if (len >= PATH_MAX) {
+                        fprintf(stderr, "invalid language specifier");
+                        return -1;
+                }
+                strncpy(spec, str, len);
+                spec[len] = '\0';
+                scripting_ops = script_spec__lookup(spec);
+                if (!scripting_ops) {
+                        fprintf(stderr, "invalid language specifier");
+                        return -1;
+                }
+                script++;
+        } else {
+                script = str;
+                ext = strchr(script, '.');
+                if (!ext) {
+                        fprintf(stderr, "invalid script extension");
+                        return -1;
+                }
+                scripting_ops = script_spec__lookup(++ext);
+                if (!scripting_ops) {
+                        fprintf(stderr, "invalid script extension");
+                        return -1;
+                }
+        }
+
+        script_name = strdup(script);
+
+        return 0;
+}
+
 static const char * const annotate_usage[] = {
         "perf trace [<options>] <command>",
         NULL
@@ -117,13 +307,23 @@ static const struct option options[] = {
                     "be more verbose (show symbol address, etc)"),
         OPT_BOOLEAN('l', "latency", &latency_format,
                     "show latency attributes (irqs/preemption disabled, etc)"),
+        OPT_CALLBACK('s', "script", NULL, "name",
+                     "script file name (lang:script name, script name, or *)",
+                     parse_scriptname),
+        OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
+                   "generate perf-trace.xx script in specified language"),
+
         OPT_END()
 };
 
 int cmd_trace(int argc, const char **argv, const char *prefix __used)
 {
+        int err;
+
         symbol__init(0);
 
+        setup_scripting();
+
         argc = parse_options(argc, argv, options, annotate_usage, 0);
         if (argc) {
                 /*
@@ -136,5 +336,50 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)
 
         setup_pager();
 
-        return __cmd_trace();
+        if (generate_script_lang) {
+                struct stat perf_stat;
+
+                int input = open(input_name, O_RDONLY);
+                if (input < 0) {
+                        perror("failed to open file");
+                        exit(-1);
+                }
+
+                err = fstat(input, &perf_stat);
+                if (err < 0) {
+                        perror("failed to stat file");
+                        exit(-1);
+                }
+
+                if (!perf_stat.st_size) {
+                        fprintf(stderr, "zero-sized file, nothing to do!\n");
+                        exit(0);
+                }
+
+                scripting_ops = script_spec__lookup(generate_script_lang);
+                if (!scripting_ops) {
+                        fprintf(stderr, "invalid language specifier");
+                        return -1;
+                }
+
+                header = perf_header__new();
+                if (header == NULL)
+                        return -1;
+
+                perf_header__read(header, input);
+                err = scripting_ops->generate_script("perf-trace");
+                goto out;
+        }
+
+        if (script_name) {
+                err = scripting_ops->start_script(script_name);
+                if (err)
+                        goto out;
+        }
+
+        err = __cmd_trace();
+
+        cleanup_scripting();
+out:
+        return err;
 }
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index dd51c6872a15..e7aaf002e667 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -259,4 +259,15 @@ enum trace_flag_type {
         TRACE_FLAG_SOFTIRQ              = 0x10,
 };
 
+struct scripting_ops {
+        const char *name;
+        int (*start_script) (const char *);
+        int (*stop_script) (void);
+        void (*process_event) (int cpu, void *data, int size,
+                               unsigned long long nsecs, char *comm);
+        int (*generate_script) (const char *outfile);
+};
+
+int script_spec_register(const char *spec, struct scripting_ops *ops);
+
 #endif /* __PERF_TRACE_EVENTS_H */