[PATCH 6/9] scripts: python: implement get or create stack function

[Anup Sharma]

The get_or_create_stack function is responsible for retrieving
or creating a stack based on the provided frame and prefix.
It first generates a key using the frame and prefix values.
If the stack corresponding to the key is found in the stackMap,
it is returned. Otherwise, a new stack is created by appending
the prefix and frame to the stackTable's 'data' array. The key
and the index of the newly created stack are added to the
stackMap for future reference.

Signed-off-by: Anup Sharma <anupnewsmail@xxxxxxxxx>
---
 tools/perf/scripts/python/firefox-gecko-converter.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
index cdd7f901c13f..30fc542cfdeb 100644
--- a/tools/perf/scripts/python/firefox-gecko-converter.py
+++ b/tools/perf/scripts/python/firefox-gecko-converter.py
@@ -57,6 +57,18 @@ def convertPerfScriptProfile(profile):
             },
             'data': [],
         }
+        
+        stringTable = []
+
+        stackMap = dict()
+        def get_or_create_stack(frame, prefix):
+            key = f"{frame}" if prefix is None else f"{frame},{prefix}"
+            stack = stackMap.get(key)
+            if stack is None:
+                stack = len(stackTable['data'])
+                stackTable['data'].append([prefix, frame])
+                stackMap[key] = stack
+            return stack
 
         def addSample(threadName, stackArray, time):
             nonlocal name
-- 
2.34.1