tools lib traceevent: Let filtering numbers by string use function names

As a pointer can be converted into a function name, let the filters
work with the function name as well as with the pointer number.  If
the comparison expects a string, then convert numbers into functions,
but only when the number is the same size as a long.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-oxsa1qkr2eq7u8d7r0aapedu@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

1 files changed, 35 insertions, 10 deletions

diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index dfcfe2c131de..80d872a81f26 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1710,18 +1710,43 @@ static int test_num(struct event_format *event,
 
 static const char *get_field_str(struct filter_arg *arg, struct pevent_record *record)
 {
-        const char *val = record->data + arg->str.field->offset;
+        struct event_format *event;
+        struct pevent *pevent;
+        unsigned long long addr;
+        const char *val = NULL;
+        char hex[64];
 
-        /*
-         * We need to copy the data since we can't be sure the field
-         * is null terminated.
-         */
-        if (*(val + arg->str.field->size - 1)) {
-                /* copy it */
-                memcpy(arg->str.buffer, val, arg->str.field->size);
-                /* the buffer is already NULL terminated */
-                val = arg->str.buffer;
+        /* If the field is not a string convert it */
+        if (arg->str.field->flags & FIELD_IS_STRING) {
+                val = record->data + arg->str.field->offset;
+
+                /*
+                 * We need to copy the data since we can't be sure the field
+                 * is null terminated.
+                 */
+                if (*(val + arg->str.field->size - 1)) {
+                        /* copy it */
+                        memcpy(arg->str.buffer, val, arg->str.field->size);
+                        /* the buffer is already NULL terminated */
+                        val = arg->str.buffer;
+                }
+
+        } else {
+                event = arg->str.field->event;
+                pevent = event->pevent;
+                addr = get_value(event, arg->str.field, record);
+
+                if (arg->str.field->flags & (FIELD_IS_POINTER | FIELD_IS_LONG))
+                        /* convert to a kernel symbol */
+                        val = pevent_find_function(pevent, addr);
+
+                if (val == NULL) {
+                        /* just use the hex of the string name */
+                        snprintf(hex, 64, "0x%llx", addr);
+                        val = hex;
+                }
         }
+
         return val;
 }