2 * Interface for configuring and controlling the state of tracing events.
4 * Copyright (C) 2011-2014 LluĂs Vilanova <vilanova@ac.upc.edu>
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
10 #include "qemu/osdep.h"
11 #include "trace/control.h"
12 #include "qemu/help_option.h"
13 #ifdef CONFIG_TRACE_SIMPLE
14 #include "trace/simple.h"
16 #ifdef CONFIG_TRACE_FTRACE
17 #include "trace/ftrace.h"
19 #ifdef CONFIG_TRACE_LOG
22 #include "qemu/error-report.h"
23 #include "monitor/monitor.h"
25 int trace_events_enabled_count;
26 bool trace_events_dstate[TRACE_EVENT_COUNT];
28 TraceEvent *trace_event_name(const char *name)
33 for (i = 0; i < trace_event_count(); i++) {
34 TraceEvent *ev = trace_event_id(i);
35 if (strcmp(trace_event_get_name(ev), name) == 0) {
42 static bool pattern_glob(const char *pat, const char *ev)
44 while (*pat != '\0' && *ev != '\0') {
49 else if (*pat == '*') {
50 if (pattern_glob(pat, ev+1)) {
52 } else if (pattern_glob(pat+1, ev)) {
66 if (*pat == '\0' && *ev == '\0') {
73 TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev)
82 i = trace_event_get_id(ev);
86 while (i < trace_event_count()) {
87 TraceEvent *res = trace_event_id(i);
88 if (pattern_glob(pat, trace_event_get_name(res))) {
97 void trace_list_events(void)
100 for (i = 0; i < trace_event_count(); i++) {
101 TraceEvent *res = trace_event_id(i);
102 fprintf(stderr, "%s\n", trace_event_get_name(res));
106 static void do_trace_enable_events(const char *line_buf)
108 const bool enable = ('-' != line_buf[0]);
109 const char *line_ptr = enable ? line_buf : line_buf + 1;
111 if (trace_event_is_pattern(line_ptr)) {
112 TraceEvent *ev = NULL;
113 while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) {
114 if (trace_event_get_state_static(ev)) {
115 trace_event_set_state_dynamic(ev, enable);
119 TraceEvent *ev = trace_event_name(line_ptr);
121 error_report("WARNING: trace event '%s' does not exist",
123 } else if (!trace_event_get_state_static(ev)) {
124 error_report("WARNING: trace event '%s' is not traceable",
127 trace_event_set_state_dynamic(ev, enable);
132 void trace_enable_events(const char *line_buf)
134 if (is_help_option(line_buf)) {
136 if (cur_mon == NULL) {
140 do_trace_enable_events(line_buf);
144 void trace_init_events(const char *fname)
156 loc_set_file(fname, 0);
157 fp = fopen(fname, "r");
159 error_report("%s", strerror(errno));
162 while (fgets(line_buf, sizeof(line_buf), fp)) {
163 loc_set_file(fname, ++line_idx);
164 size_t len = strlen(line_buf);
165 if (len > 1) { /* skip empty lines */
166 line_buf[len - 1] = '\0';
167 if ('#' == line_buf[0]) { /* skip commented lines */
170 trace_enable_events(line_buf);
173 if (fclose(fp) != 0) {
174 loc_set_file(fname, 0);
175 error_report("%s", strerror(errno));
181 void trace_init_file(const char *file)
183 #ifdef CONFIG_TRACE_SIMPLE
184 st_set_trace_file(file);
185 #elif defined CONFIG_TRACE_LOG
186 /* If both the simple and the log backends are enabled, "-trace file"
187 * only applies to the simple backend; use "-D" for the log backend.
190 qemu_set_log_filename(file);
194 fprintf(stderr, "error: -trace file=...: "
195 "option not supported by the selected tracing backends\n");
201 bool trace_init_backends(void)
203 #ifdef CONFIG_TRACE_SIMPLE
205 fprintf(stderr, "failed to initialize simple tracing backend.\n");
210 #ifdef CONFIG_TRACE_FTRACE
211 if (!ftrace_init()) {
212 fprintf(stderr, "failed to initialize ftrace backend.\n");