| /* |
| * Interface for configuring and controlling the state of tracing events. |
| * |
| * Copyright (C) 2011-2014 LluĂs Vilanova <vilanova@ac.upc.edu> |
| * |
| * 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 |
| #include "qapi/error.h" |
| #include "qemu/error-report.h" |
| #include "monitor/monitor.h" |
| |
| int trace_events_enabled_count; |
| bool trace_events_dstate[TRACE_EVENT_COUNT]; |
| |
| TraceEvent *trace_event_name(const char *name) |
| { |
| assert(name != NULL); |
| |
| TraceEventID i; |
| for (i = 0; i < trace_event_count(); i++) { |
| TraceEvent *ev = trace_event_id(i); |
| 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; |
| } |
| } |
| |
| TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev) |
| { |
| assert(pat != NULL); |
| |
| TraceEventID i; |
| |
| if (ev == NULL) { |
| i = -1; |
| } else { |
| i = trace_event_get_id(ev); |
| } |
| i++; |
| |
| while (i < trace_event_count()) { |
| TraceEvent *res = trace_event_id(i); |
| if (pattern_glob(pat, trace_event_get_name(res))) { |
| return res; |
| } |
| i++; |
| } |
| |
| return NULL; |
| } |
| |
| void trace_list_events(void) |
| { |
| int i; |
| for (i = 0; i < trace_event_count(); i++) { |
| TraceEvent *res = trace_event_id(i); |
| fprintf(stderr, "%s\n", trace_event_get_name(res)); |
| } |
| } |
| |
| 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; |
| |
| if (trace_event_is_pattern(line_ptr)) { |
| TraceEvent *ev = NULL; |
| while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) { |
| if (trace_event_get_state_static(ev)) { |
| trace_event_set_state_dynamic(ev, enable); |
| } |
| } |
| } else { |
| TraceEvent *ev = trace_event_name(line_ptr); |
| if (ev == NULL) { |
| error_report("WARNING: trace event '%s' does not exist", |
| line_ptr); |
| } else if (!trace_event_get_state_static(ev)) { |
| error_report("WARNING: trace event '%s' is not traceable", |
| line_ptr); |
| } else { |
| trace_event_set_state_dynamic(ev, enable); |
| } |
| } |
| } |
| |
| void trace_enable_events(const char *line_buf) |
| { |
| if (is_help_option(line_buf)) { |
| trace_list_events(); |
| if (cur_mon == NULL) { |
| exit(0); |
| } |
| } else { |
| do_trace_enable_events(line_buf); |
| } |
| } |
| |
| void trace_init_events(const char *fname) |
| { |
| Location loc; |
| FILE *fp; |
| char line_buf[1024]; |
| size_t line_idx = 0; |
| |
| if (fname == NULL) { |
| return; |
| } |
| |
| loc_push_none(&loc); |
| loc_set_file(fname, 0); |
| fp = fopen(fname, "r"); |
| if (!fp) { |
| error_report("%s", strerror(errno)); |
| exit(1); |
| } |
| 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; |
| } |
| trace_enable_events(line_buf); |
| } |
| } |
| if (fclose(fp) != 0) { |
| 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 |
| |
| return true; |
| } |