linux-kernel - [PATCH 2/2] perf script: handle the num array type in python properly

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Date:	Tue, 27 May 2014 18:14:34 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 2/2] perf script: handle the num array type in python properly

The raw_syscalls:sys_enter tracer for instance passes has one argument
named 'arg' which is an array of 6 integers. Right the python scripts
gets only 0 passed as an argument. The reason is that
pevent_read_number() can not handle data types of 48 and returns always
0.
This patch changes this by passing num array as list of nums which fit
the description. As a result python will now see a list named arg which
contains 6 (integer) items.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 .../util/scripting-engines/trace-event-python.c    | 43 ++++++++++++++++------
 1 file changed, 31 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index aa11790..40a815a 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -233,22 +233,41 @@ static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 static PyObject *get_field_numeric_entry(struct event_format *event,
 		struct format_field *field, void *data)
 {
-	PyObject *obj;
+	bool is_array = field->flags & FIELD_IS_ARRAY;
+	PyObject *obj, *list = NULL;
 	unsigned long long val;
+	unsigned int item_size, n_items, i;
 
-	val = read_size(event, data + field->offset, field->size);
-	if (field->flags & FIELD_IS_SIGNED) {
-		if ((long long)val >= LONG_MIN &&
-				(long long)val <= LONG_MAX)
-			obj = PyInt_FromLong(val);
-		else
-			obj = PyLong_FromLongLong(val);
+	if (is_array) {
+		list = PyList_New(field->arraylen);
+		item_size = field->size / field->arraylen;
+		n_items = field->arraylen;
 	} else {
-		if (val <= LONG_MAX)
-			obj = PyInt_FromLong(val);
-		else
-			obj = PyLong_FromUnsignedLongLong(val);
+		item_size = field->size;
+		n_items = 1;
+	}
+
+	for (i = 0; i < n_items; i++) {
+
+		val = read_size(event, data + field->offset + i * item_size,
+				item_size);
+		if (field->flags & FIELD_IS_SIGNED) {
+			if ((long long)val >= LONG_MIN &&
+					(long long)val <= LONG_MAX)
+				obj = PyInt_FromLong(val);
+			else
+				obj = PyLong_FromLongLong(val);
+		} else {
+			if (val <= LONG_MAX)
+				obj = PyInt_FromLong(val);
+			else
+				obj = PyLong_FromUnsignedLongLong(val);
+		}
+		if (is_array)
+			PyList_SET_ITEM(list, i, obj);
 	}
+	if (is_array)
+		obj = list;
 	return obj;
 }
 
-- 
2.0.0.rc4

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