/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
*/
+#include "qemu/osdep.h"
#include "trace/control.h"
+#include "qemu/help_option.h"
+#ifdef CONFIG_TRACE_SIMPLE
+#include "trace/simple.h"
+#endif
+#ifdef CONFIG_TRACE_FTRACE
+#include "trace/ftrace.h"
+#endif
+#ifdef CONFIG_TRACE_LOG
+#include "qemu/log.h"
+#endif
+#ifdef CONFIG_TRACE_SYSLOG
+#include <syslog.h>
+#endif
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/config-file.h"
+#include "monitor/monitor.h"
+int trace_events_enabled_count;
-void trace_backend_init_events(const char *fname)
+QemuOptsList qemu_trace_opts = {
+ .name = "trace",
+ .implied_opt_name = "enable",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
+ .desc = {
+ {
+ .name = "enable",
+ .type = QEMU_OPT_STRING,
+ },
+ {
+ .name = "events",
+ .type = QEMU_OPT_STRING,
+ },{
+ .name = "file",
+ .type = QEMU_OPT_STRING,
+ },
+ { /* end of list */ }
+ },
+};
+
+
+TraceEvent *trace_event_name(const char *name)
+{
+ assert(name != NULL);
+
+ TraceEventIter iter;
+ TraceEvent *ev;
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ if (strcmp(trace_event_get_name(ev), name) == 0) {
+ return ev;
+ }
+ }
+ return NULL;
+}
+
+static bool pattern_glob(const char *pat, const char *ev)
+{
+ while (*pat != '\0' && *ev != '\0') {
+ if (*pat == *ev) {
+ pat++;
+ ev++;
+ }
+ else if (*pat == '*') {
+ if (pattern_glob(pat, ev+1)) {
+ return true;
+ } else if (pattern_glob(pat+1, ev)) {
+ return true;
+ } else {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ }
+
+ while (*pat == '*') {
+ pat++;
+ }
+
+ if (*pat == '\0' && *ev == '\0') {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+
+void trace_event_iter_init(TraceEventIter *iter, const char *pattern)
+{
+ iter->event = 0;
+ iter->pattern = pattern;
+}
+
+TraceEvent *trace_event_iter_next(TraceEventIter *iter)
+{
+ while (iter->event < TRACE_EVENT_COUNT) {
+ TraceEvent *ev = trace_events[iter->event];
+ iter->event++;
+ if (!iter->pattern ||
+ pattern_glob(iter->pattern,
+ trace_event_get_name(ev))) {
+ return ev;
+ }
+ }
+
+ return NULL;
+}
+
+void trace_list_events(void)
+{
+ TraceEventIter iter;
+ TraceEvent *ev;
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ fprintf(stderr, "%s\n", trace_event_get_name(ev));
+ }
+}
+
+static void do_trace_enable_events(const char *line_buf)
+{
+ const bool enable = ('-' != line_buf[0]);
+ const char *line_ptr = enable ? line_buf : line_buf + 1;
+ TraceEventIter iter;
+ TraceEvent *ev;
+ bool is_pattern = trace_event_is_pattern(line_ptr);
+
+ trace_event_iter_init(&iter, line_ptr);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ if (!trace_event_get_state_static(ev)) {
+ if (!is_pattern) {
+ error_report("WARNING: trace event '%s' is not traceable",
+ line_ptr);
+ return;
+ }
+ continue;
+ }
+
+ /* start tracing */
+ trace_event_set_state_dynamic(ev, enable);
+ if (!is_pattern) {
+ return;
+ }
+ }
+
+ if (!is_pattern) {
+ error_report("WARNING: trace event '%s' does not exist",
+ line_ptr);
+ }
+}
+
+void trace_enable_events(const char *line_buf)
{
- int ret;
+ if (is_help_option(line_buf)) {
+ trace_list_events();
+ if (cur_mon == NULL) {
+ exit(0);
+ }
+ } else {
+ do_trace_enable_events(line_buf);
+ }
+}
+
+static void trace_init_events(const char *fname)
+{
+ Location loc;
+ FILE *fp;
+ char line_buf[1024];
+ size_t line_idx = 0;
if (fname == NULL) {
return;
}
- FILE *fp = fopen(fname, "r");
+ loc_push_none(&loc);
+ loc_set_file(fname, 0);
+ fp = fopen(fname, "r");
if (!fp) {
- fprintf(stderr, "error: could not open trace events file '%s': %s\n",
- fname, strerror(errno));
+ error_report("%s", strerror(errno));
exit(1);
}
- char line_buf[1024];
while (fgets(line_buf, sizeof(line_buf), fp)) {
+ loc_set_file(fname, ++line_idx);
size_t len = strlen(line_buf);
if (len > 1) { /* skip empty lines */
line_buf[len - 1] = '\0';
if ('#' == line_buf[0]) { /* skip commented lines */
continue;
}
- if ('-' == line_buf[0]) {
- ret = trace_event_set_state(line_buf+1, false);
- } else {
- ret = trace_event_set_state(line_buf, true);
- }
- if (!ret) {
- fprintf(stderr,
- "error: trace event '%s' does not exist\n", line_buf);
- exit(1);
- }
+ trace_enable_events(line_buf);
}
}
if (fclose(fp) != 0) {
- fprintf(stderr, "error: closing file '%s': %s\n",
- fname, strerror(errno));
+ loc_set_file(fname, 0);
+ error_report("%s", strerror(errno));
+ exit(1);
+ }
+ loc_pop(&loc);
+}
+
+void trace_init_file(const char *file)
+{
+#ifdef CONFIG_TRACE_SIMPLE
+ st_set_trace_file(file);
+#elif defined CONFIG_TRACE_LOG
+ /* If both the simple and the log backends are enabled, "-trace file"
+ * only applies to the simple backend; use "-D" for the log backend.
+ */
+ if (file) {
+ qemu_set_log_filename(file, &error_fatal);
+ }
+#else
+ if (file) {
+ fprintf(stderr, "error: -trace file=...: "
+ "option not supported by the selected tracing backends\n");
exit(1);
}
+#endif
+}
+
+bool trace_init_backends(void)
+{
+#ifdef CONFIG_TRACE_SIMPLE
+ if (!st_init()) {
+ fprintf(stderr, "failed to initialize simple tracing backend.\n");
+ return false;
+ }
+#endif
+
+#ifdef CONFIG_TRACE_FTRACE
+ if (!ftrace_init()) {
+ fprintf(stderr, "failed to initialize ftrace backend.\n");
+ return false;
+ }
+#endif
+
+#ifdef CONFIG_TRACE_SYSLOG
+ openlog(NULL, LOG_PID, LOG_DAEMON);
+#endif
+
+ return true;
+}
+
+char *trace_opt_parse(const char *optarg)
+{
+ char *trace_file;
+ QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
+ optarg, true);
+ if (!opts) {
+ exit(1);
+ }
+ if (qemu_opt_get(opts, "enable")) {
+ trace_enable_events(qemu_opt_get(opts, "enable"));
+ }
+ trace_init_events(qemu_opt_get(opts, "events"));
+ trace_file = g_strdup(qemu_opt_get(opts, "file"));
+ qemu_opts_del(opts);
+
+ return trace_file;
}
projects / mirror_qemu.git / blobdiff