tools lib traceevent: Add support for __print_array()

Since 6ea22486ba46 ("tracing: Add array printing helper") trace can
generate traces with variable element size arrays.  Add support to
parse them.

Signed-off-by: Javi Merino <javi.merino@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1427195239-15730-1-git-send-email-javi.merino@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 101 insertions, 0 deletions

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index bc227225c7f4..b6d11eea8a57 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -766,6 +766,11 @@ static void free_arg(struct print_arg *arg)
                 free_arg(arg->hex.field);
                 free_arg(arg->hex.size);
                 break;
+        case PRINT_INT_ARRAY:
+                free_arg(arg->int_array.field);
+                free_arg(arg->int_array.count);
+                free_arg(arg->int_array.el_size);
+                break;
         case PRINT_TYPE:
                 free(arg->typecast.type);
                 free_arg(arg->typecast.item);
@@ -2545,6 +2550,32 @@ out:
 }
 
 static enum event_type
+process_int_array(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        memset(arg, 0, sizeof(*arg));
+        arg->type = PRINT_INT_ARRAY;
+
+        if (alloc_and_process_delim(event, ",", &arg->int_array.field))
+                goto out;
+
+        if (alloc_and_process_delim(event, ",", &arg->int_array.count))
+                goto free_field;
+
+        if (alloc_and_process_delim(event, ")", &arg->int_array.el_size))
+                goto free_size;
+
+        return read_token_item(tok);
+
+free_size:
+        free_arg(arg->int_array.count);
+free_field:
+        free_arg(arg->int_array.field);
+out:
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
 {
         struct format_field *field;
@@ -2839,6 +2870,10 @@ process_function(struct event_format *event, struct print_arg *arg,
                 free_token(token);
                 return process_hex(event, arg, tok);
         }
+        if (strcmp(token, "__print_array") == 0) {
+                free_token(token);
+                return process_int_array(event, arg, tok);
+        }
         if (strcmp(token, "__get_str") == 0) {
                 free_token(token);
                 return process_str(event, arg, tok);
@@ -3367,6 +3402,7 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
                 break;
         case PRINT_FLAGS:
         case PRINT_SYMBOL:
+        case PRINT_INT_ARRAY:
         case PRINT_HEX:
                 break;
         case PRINT_TYPE:
@@ -3777,6 +3813,54 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
                 }
                 break;
 
+        case PRINT_INT_ARRAY: {
+                void *num;
+                int el_size;
+
+                if (arg->int_array.field->type == PRINT_DYNAMIC_ARRAY) {
+                        unsigned long offset;
+                        struct format_field *field =
+                                arg->int_array.field->dynarray.field;
+                        offset = pevent_read_number(pevent,
+                                                    data + field->offset,
+                                                    field->size);
+                        num = data + (offset & 0xffff);
+                } else {
+                        field = arg->int_array.field->field.field;
+                        if (!field) {
+                                str = arg->int_array.field->field.name;
+                                field = pevent_find_any_field(event, str);
+                                if (!field)
+                                        goto out_warning_field;
+                                arg->int_array.field->field.field = field;
+                        }
+                        num = data + field->offset;
+                }
+                len = eval_num_arg(data, size, event, arg->int_array.count);
+                el_size = eval_num_arg(data, size, event,
+                                       arg->int_array.el_size);
+                for (i = 0; i < len; i++) {
+                        if (i)
+                                trace_seq_putc(s, ' ');
+
+                        if (el_size == 1) {
+                                trace_seq_printf(s, "%u", *(uint8_t *)num);
+                        } else if (el_size == 2) {
+                                trace_seq_printf(s, "%u", *(uint16_t *)num);
+                        } else if (el_size == 4) {
+                                trace_seq_printf(s, "%u", *(uint32_t *)num);
+                        } else if (el_size == 8) {
+                                trace_seq_printf(s, "%lu", *(uint64_t *)num);
+                        } else {
+                                trace_seq_printf(s, "BAD SIZE:%d 0x%x",
+                                                 el_size, *(uint8_t *)num);
+                                el_size = 1;
+                        }
+
+                        num += el_size;
+                }
+                break;
+        }
         case PRINT_TYPE:
                 break;
         case PRINT_STRING: {
@@ -5361,6 +5445,15 @@ static void print_args(struct print_arg *args)
                 print_args(args->hex.size);
                 printf(")");
                 break;
+        case PRINT_INT_ARRAY:
+                printf("__print_array(");
+                print_args(args->int_array.field);
+                printf(", ");
+                print_args(args->int_array.count);
+                printf(", ");
+                print_args(args->int_array.el_size);
+                printf(")");
+                break;
         case PRINT_STRING:
         case PRINT_BSTRING:
                 printf("__get_str(%s)", args->string.string);
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 8ca1b8ee50da..86a5839fb048 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -251,6 +251,12 @@ struct print_arg_hex {
         struct print_arg        *size;
 };
 
+struct print_arg_int_array {
+        struct print_arg        *field;
+        struct print_arg        *count;
+        struct print_arg        *el_size;
+};
+
 struct print_arg_dynarray {
         struct format_field     *field;
         struct print_arg        *index;
@@ -279,6 +285,7 @@ enum print_arg_type {
         PRINT_FLAGS,
         PRINT_SYMBOL,
         PRINT_HEX,
+        PRINT_INT_ARRAY,
         PRINT_TYPE,
         PRINT_STRING,
         PRINT_BSTRING,
@@ -298,6 +305,7 @@ struct print_arg {
                 struct print_arg_flags          flags;
                 struct print_arg_symbol         symbol;
                 struct print_arg_hex            hex;
+                struct print_arg_int_array      int_array;
                 struct print_arg_func           func;
                 struct print_arg_string         string;
                 struct print_arg_bitmask        bitmask;