170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*
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* Interface for configuring and controlling the state of tracing events.
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*
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* Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "trace/control.h"
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#ifdef CONFIG_TRACE_SIMPLE
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#include "trace/simple.h"
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#endif
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#ifdef CONFIG_TRACE_FTRACE
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#include "trace/ftrace.h"
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#endif
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#include "qemu/error-report.h"
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TraceEvent *trace_event_name(const char *name)
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{
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assert(name != NULL);
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TraceEventID i;
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for (i = 0; i < trace_event_count(); i++) {
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TraceEvent *ev = trace_event_id(i);
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if (strcmp(trace_event_get_name(ev), name) == 0) {
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return ev;
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}
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}
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return NULL;
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}
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static bool pattern_glob(const char *pat, const char *ev)
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{
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while (*pat != '\0' && *ev != '\0') {
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if (*pat == *ev) {
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pat++;
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ev++;
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}
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else if (*pat == '*') {
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if (pattern_glob(pat, ev+1)) {
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return true;
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} else if (pattern_glob(pat+1, ev)) {
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return true;
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} else {
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return false;
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}
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} else {
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return false;
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}
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}
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while (*pat == '*') {
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pat++;
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}
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if (*pat == '\0' && *ev == '\0') {
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return true;
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} else {
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return false;
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}
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}
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TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev)
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{
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assert(pat != NULL);
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TraceEventID i;
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if (ev == NULL) {
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i = -1;
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} else {
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i = trace_event_get_id(ev);
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}
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i++;
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while (i < trace_event_count()) {
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TraceEvent *res = trace_event_id(i);
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if (pattern_glob(pat, trace_event_get_name(res))) {
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return res;
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}
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i++;
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}
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return NULL;
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}
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static void trace_init_events(const char *fname)
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{
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Location loc;
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FILE *fp;
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char line_buf[1024];
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size_t line_idx = 0;
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if (fname == NULL) {
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return;
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}
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loc_push_none(&loc);
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loc_set_file(fname, 0);
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fp = fopen(fname, "r");
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if (!fp) {
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error_report("%s", strerror(errno));
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exit(1);
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}
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while (fgets(line_buf, sizeof(line_buf), fp)) {
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loc_set_file(fname, ++line_idx);
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size_t len = strlen(line_buf);
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if (len > 1) { /* skip empty lines */
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line_buf[len - 1] = '\0';
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if ('#' == line_buf[0]) { /* skip commented lines */
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continue;
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}
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const bool enable = ('-' != line_buf[0]);
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char *line_ptr = enable ? line_buf : line_buf + 1;
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if (trace_event_is_pattern(line_ptr)) {
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TraceEvent *ev = NULL;
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while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) {
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if (trace_event_get_state_static(ev)) {
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trace_event_set_state_dynamic(ev, enable);
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}
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}
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} else {
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TraceEvent *ev = trace_event_name(line_ptr);
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if (ev == NULL) {
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error_report("WARNING: trace event '%s' does not exist",
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line_ptr);
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} else if (!trace_event_get_state_static(ev)) {
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error_report("WARNING: trace event '%s' is not traceable\n",
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line_ptr);
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} else {
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trace_event_set_state_dynamic(ev, enable);
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}
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}
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}
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}
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if (fclose(fp) != 0) {
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loc_set_file(fname, 0);
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error_report("%s", strerror(errno));
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exit(1);
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}
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loc_pop(&loc);
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}
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bool trace_init_backends(const char *events, const char *file)
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{
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#ifdef CONFIG_TRACE_SIMPLE
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if (!st_init(file)) {
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fprintf(stderr, "failed to initialize simple tracing backend.\n");
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return false;
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}
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#else
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if (file) {
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fprintf(stderr, "error: -trace file=...: "
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"option not supported by the selected tracing backends\n");
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return false;
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}
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#endif
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#ifdef CONFIG_TRACE_FTRACE
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if (!ftrace_init()) {
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fprintf(stderr, "failed to initialize ftrace backend.\n");
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return false;
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}
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#endif
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trace_init_events(events);
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return true;
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}
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