update unusedmethods loplugin to update unused return values

Change-Id: I825d022d09282bc9b6cffd9178e40e4090d335da

compilerplugins/clang/unusedmethods.py

@@ -7,6 +7,7 @@ import io
 definitionSet = set()
 definitionToSourceLocationMap = dict()
 callSet = set()
+returnSet = set()
 sourceLocationSet = set()
 # things we need to exclude for reasons like :
 # - it's a weird template thingy that confuses the plugin
@@ -125,6 +126,9 @@ with io.open(sys.argv[1], "rb", buffering=1024*1024) as txt:
         elif line.startswith("call:\t"):
             idx1 = line.find("\t",6)
             callSet.add((normalizeTypeParams(line[6:idx1]), normalizeTypeParams(line[idx1+1:].strip())))
+        elif line.startswith("usedReturn:\t"):
+            idx1 = line.find("\t",12)
+            returnSet.add((normalizeTypeParams(line[12:idx1]), normalizeTypeParams(line[idx1+1:].strip())))
 
 # Invert the definitionToSourceLocationMap
 # If we see more than one method at the same sourceLocation, it's being autogenerated as part of a template
@@ -138,6 +142,10 @@ for k, definitions in sourceLocationToDefinitionMap.iteritems():
         for d in definitions:
             definitionSet.remove(d)
     
+# -------------------------------------------
+# Do the "unused methods" part
+# -------------------------------------------
+
 tmp1set = set()
 for d in definitionSet:
     clazz = d[0] + " " + d[1]
@@ -228,12 +236,45 @@ def natural_sort_key(s, _nsre=re.compile('([0-9]+)')):
 tmp1list = sorted(tmp1set, key=lambda v: natural_sort_key(v[1]))
 
 # print out the results
-for t in tmp1list:
+#for t in tmp1list:
+#    print t[1]
+#    print "    ", t[0]
+
+
+# -------------------------------------------
+# Do the "unused return types" part
+# -------------------------------------------
+
+tmp2set = set()
+for d in definitionSet:
+    clazz = d[0] + " " + d[1]
+    if clazz in exclusionSet:
+        continue
+    if d in returnSet:
+        continue
+    if d[0] == "void":
+        continue
+    # ignore UNO constructor method entrypoints
+    if "_get_implementation" in d[1]:
+        continue
+    # the plugin can't see calls to these
+    if "operator new" in d[1]:
+        continue
+    # unused return type is not a problem here
+    if "operator=(" in d[1]:
+        continue
+    # ignore external code
+    if definitionToSourceLocationMap[d].startswith("external/"):
+       continue
+    tmp2set.add((clazz, definitionToSourceLocationMap[d]))
+
+# sort results by name and line number
+tmp2list = sorted(tmp2set, key=lambda v: natural_sort_key(v[1]))
+    
+for t in tmp2list:
     print t[1]
     print "    ", t[0]
 
-    
-
 # add an empty line at the end to make it easier for the unusedmethodsremove plugin to mmap() the output file 
 print