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authorLluís Vilanova <vilanova@ac.upc.edu>2013-03-05 14:47:38 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-28 14:19:57 +0100
commitb1bae816c4c0743e37ee9e797a503610c34e3073 (patch)
tree4b10c9a3a0bfa301d8ecd728db20e61867eeb4ac /trace/control.c
parent45be2f5d0dcdd314cd0c70a11220e5e09a44d654 (diff)
downloadqemu-arm-b1bae816c4c0743e37ee9e797a503610c34e3073.tar.gz
trace: Provide a detailed event control interface
This interface decouples event obtaining from interaction. Events can be obtained through three different methods: * identifier * name * simple wildcard pattern Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'trace/control.c')
-rw-r--r--trace/control.c106
1 files changed, 93 insertions, 13 deletions
diff --git a/trace/control.c b/trace/control.c
index be05efb99b..49f61e137b 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -1,19 +1,86 @@
/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2011-2012 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 "trace/control.h"
-void trace_backend_init_events(const char *fname)
+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)
{
- int ret;
+ 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_backend_init_events(const char *fname)
+{
if (fname == NULL) {
return;
}
@@ -32,15 +99,28 @@ void trace_backend_init_events(const char *fname)
if ('#' == line_buf[0]) { /* skip commented lines */
continue;
}
- if ('-' == line_buf[0]) {
- ret = trace_event_set_state(line_buf+1, false);
+ const bool enable = ('-' != line_buf[0]);
+ 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 {
- ret = trace_event_set_state(line_buf, true);
- }
- if (!ret) {
- fprintf(stderr,
- "error: trace event '%s' does not exist\n", line_buf);
- exit(1);
+ TraceEvent *ev = trace_event_name(line_ptr);
+ if (ev == NULL) {
+ fprintf(stderr,
+ "error: trace event '%s' does not exist\n", line_ptr);
+ exit(1);
+ }
+ if (!trace_event_get_state_static(ev)) {
+ fprintf(stderr,
+ "error: trace event '%s' is not traceable\n", line_ptr);
+ exit(1);
+ }
+ trace_event_set_state_dynamic(ev, enable);
}
}
}