Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/lldb/examples/summaries/cocoa/cache.py

@@ -0,0 +1,36 @@
+"""
+Objective-C runtime wrapper for use by LLDB Python formatters
+
+part of The LLVM Compiler Infrastructure
+This file is distributed under the University of Illinois Open Source
+License. See LICENSE.TXT for details.
+"""
+import lldb.formatters.metrics
+
+
+class Cache:
+
+    def __init__(self):
+        self.data = {}
+        self.statistics = lldb.formatters.metrics.Metrics()
+        self.statistics.add_metric('hit')
+        self.statistics.add_metric('miss')
+
+    def look_for_key(self, key):
+        if key in self.data:
+            return True
+        return False
+
+    def add_item(self, key, value, ok_to_replace=True):
+        if not(ok_to_replace) and self.look_for_key(key):
+            return False
+        self.data[key] = value
+        return True
+
+    def get_value(self, key, default=None):
+        if self.look_for_key(key):
+            self.statistics.metric_hit('hit', key)
+            return self.data[key]
+        else:
+            self.statistics.metric_hit('miss', key)
+            return default