[PATCH v2 7/7] scripts: python: Add trace end processing and JSON output

[Anup Sharma <anupnewsmail@gmail.com>]

Inside the trace end function the final output will be dumped
to standard output in JSON gecko format. Additionally, constants
such as USER_CATEGORY_INDEX, KERNEL_CATEGORY_INDEX, CATEGORIES, and
PRODUCT are defined to provide contextual information.
Also added _addThreadSample call which was missing.

Signed-off-by: Anup Sharma <anupnewsmail@gmail.com>
---
 .../scripts/python/firefox-gecko-converter.py | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
index 910e598c743f..6a2a4d816799 100644
--- a/tools/perf/scripts/python/firefox-gecko-converter.py
+++ b/tools/perf/scripts/python/firefox-gecko-converter.py
@@ -18,9 +18,47 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
 from perf_trace_context import *
 from Core import *
 
+USER_CATEGORY_INDEX = 0
+KERNEL_CATEGORY_INDEX = 1
 thread_map = {}
 start_time = None
 
+CATEGORIES = [
+    {'name': 'User', 'color': 'yellow', 'subcategories': ['Other']},
+    {'name': 'Kernel', 'color': 'orange', 'subcategories': ['Other']}
+]
+
+PRODUCT = os.popen('uname -op').read().strip()
+
+def trace_end():
+    thread_array = list(map(lambda thread: thread['finish'](), thread_map.values()))
+    for thread in thread_array:
+        key = thread['samples']['schema']['time']
+        thread['samples']['data'].sort(key=lambda data : float(data[key]))
+
+    result = {
+        'meta': {
+            'interval': 1,
+            'processType': 0,
+            'product': PRODUCT,
+            'stackwalk': 1,
+            'debug': 0,
+            'gcpoison': 0,
+            'asyncstack': 1,
+            'startTime': start_time,
+            'shutdownTime': None,
+            'version': 24,
+            'presymbolicated': True,
+            'categories': CATEGORIES,
+            'markerSchema': []
+            },
+        'libs': [],
+        'threads': thread_array,
+        'processes': [],
+        'pausedRanges': []
+    }
+    json.dump(result, sys.stdout, indent=2)
+
 def process_event(param_dict):
 	global start_time
 	global thread_map
@@ -159,6 +197,8 @@ def process_event(param_dict):
 			stack.append(call['sym']['name'] + f' (in {call["dso"]})')
 		if len(stack) != 0:
 			stack = stack[::-1]
+			_addThreadSample(pid, tid, thread_name, time_stamp, stack)
 	else:
 		mod = param_dict['symbol'] if 'symbol' in param_dict else '[unknown]'
 		dso = param_dict['dso'] if 'dso' in param_dict else '[unknown]'
+		_addThreadSample(pid, tid, thread_name, time_stamp, [mod + f' (in {dso})'])
-- 
2.34.1