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tools lib traceevent: Support function __get_dynamic_array_len

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Support helper function __get_dynamic_array_len() in libtraceevent, this
function is used accompany with __print_array() or __print_hex(), but
currently it is not an available function in the function list of
process_function().

The total allocated length of the dynamic array is embedded in the top
half of __data_loc_##item field. This patch adds new arg type
PRINT_DYNAMIC_ARRAY_LEN to return the length to eval_num_arg(),

Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1440822125-52691-32-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
He Kuang 2015-08-29 04:22:05 +00:00 committed by Arnaldo Carvalho de Melo
parent dabf626f7f
commit 76055940c1
4 changed files with 57 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
tools/lib/traceevent/event-parse.c
View File

@ -848,6 +848,7 @@ static void free_arg(struct print_arg *arg)
free(arg->bitmask.bitmask);
break;
case PRINT_DYNAMIC_ARRAY:
case PRINT_DYNAMIC_ARRAY_LEN:
free(arg->dynarray.index);
break;
case PRINT_OP:
@ -2728,6 +2729,42 @@ process_dynamic_array(struct event_format *event, struct print_arg *arg, char **
return EVENT_ERROR;
}
static enum event_type
process_dynamic_array_len(struct event_format *event, struct print_arg *arg,
char **tok)
{
struct format_field *field;
enum event_type type;
char *token;
if (read_expect_type(EVENT_ITEM, &token) < 0)
goto out_free;
arg->type = PRINT_DYNAMIC_ARRAY_LEN;
/* Find the field */
field = pevent_find_field(event, token);
if (!field)
goto out_free;
arg->dynarray.field = field;
arg->dynarray.index = 0;
if (read_expected(EVENT_DELIM, ")") < 0)
goto out_err;
type = read_token(&token);
*tok = token;
return type;
out_free:
free_token(token);
out_err:
*tok = NULL;
return EVENT_ERROR;
}
static enum event_type
process_paren(struct event_format *event, struct print_arg *arg, char **tok)
{
@ -2975,6 +3012,10 @@ process_function(struct event_format *event, struct print_arg *arg,
free_token(token);
return process_dynamic_array(event, arg, tok);
}
if (strcmp(token, "__get_dynamic_array_len") == 0) {
free_token(token);
return process_dynamic_array_len(event, arg, tok);
}
func = find_func_handler(event->pevent, token);
if (func) {
@ -3655,14 +3696,25 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
goto out_warning_op;
}
break;
case PRINT_DYNAMIC_ARRAY_LEN:
offset = pevent_read_number(pevent,
data + arg->dynarray.field->offset,
arg->dynarray.field->size);
/*
* The total allocated length of the dynamic array is
* stored in the top half of the field, and the offset
* is in the bottom half of the 32 bit field.
*/
val = (unsigned long long)(offset >> 16);
break;
case PRINT_DYNAMIC_ARRAY:
/* Without [], we pass the address to the dynamic data */
offset = pevent_read_number(pevent,
data + arg->dynarray.field->offset,
arg->dynarray.field->size);
/*
* The actual length of the dynamic array is stored
* in the top half of the field, and the offset
* The total allocated length of the dynamic array is
* stored in the top half of the field, and the offset
* is in the bottom half of the 32 bit field.
*/
offset &= 0xffff;

1
tools/lib/traceevent/event-parse.h
View File

@ -294,6 +294,7 @@ enum print_arg_type {
PRINT_OP,
PRINT_FUNC,
PRINT_BITMASK,
PRINT_DYNAMIC_ARRAY_LEN,
};
struct print_arg {

1
tools/perf/util/scripting-engines/trace-event-perl.c
View File

@ -221,6 +221,7 @@ static void define_event_symbols(struct event_format *event,
break;
case PRINT_BSTRING:
case PRINT_DYNAMIC_ARRAY:
case PRINT_DYNAMIC_ARRAY_LEN:
case PRINT_STRING:
case PRINT_BITMASK:
break;

1
tools/perf/util/scripting-engines/trace-event-python.c
View File

@ -251,6 +251,7 @@ static void define_event_symbols(struct event_format *event,
/* gcc warns for these? */
case PRINT_BSTRING:
case PRINT_DYNAMIC_ARRAY:
case PRINT_DYNAMIC_ARRAY_LEN:
case PRINT_FUNC:
case PRINT_BITMASK:
/* we should warn... */