1 files changed, 129 insertions, 0 deletions
diff --git a/compilerplugins/clang/virtualdead.py b/compilerplugins/clang/virtualdead.py
new file mode 100755
index 000000000..4584345da
--- /dev/null
+++ b/compilerplugins/clang/virtualdead.py
@@ -0,0 +1,129 @@
+#!/usr/bin/python3
+
+import sys
+import re
+import io
+
+callDict = dict() # callInfo tuple -> callValue
+definitionToSourceLocationMap = dict()
+paramSet = set() # paraminfo tuple
+
+# clang does not always use exactly the same numbers in the type-parameter vars it generates
+# so I need to substitute them to ensure we can match correctly.
+normalizeTypeParamsRegex = re.compile(r"type-parameter-\d+-\d+")
+def normalizeTypeParams( line ):
+    return normalizeTypeParamsRegex.sub("type-parameter-?-?", line)
+
+# reading as binary (since we known it is pure ascii) is much faster than reading as unicode
+with io.open("workdir/loplugin.virtualdead.log", "r", encoding="ascii", errors="ignore", buffering=1024*1024) as txt:
+    for line in txt:
+        try:
+            tokens = line.strip().split("\t")
+            if tokens[0] == "virtual:":
+                nameAndParams = normalizeTypeParams(tokens[1])
+                sourceLocation = tokens[2]
+                returnValue = tokens[3]
+                callInfo = (nameAndParams, sourceLocation)
+                if not callInfo in callDict:
+                    callDict[callInfo] = set()
+                callDict[callInfo].add(returnValue)
+                definitionToSourceLocationMap[nameAndParams] = sourceLocation
+            elif tokens[0] == "param:":
+                name = normalizeTypeParams(tokens[1])
+                if len(tokens)>2:
+                    bitfield = tokens[2]
+                    paramSet.add((name,bitfield))
+            else:
+                print( "unknown line: " + line)
+        except IndexError:
+            print("problem with line " + line.strip())
+            raise
+
+tmp1list = list()
+for callInfo, callValues in iter(callDict.items()):
+    nameAndParams = callInfo[1]
+    if len(callValues) != 1:
+        continue
+    callValue = next(iter(callValues))
+    if "unknown-stmt" in callValue:
+        continue
+    if "unknown2" in callValue:
+        continue
+    if "unknown3" in callValue:
+        continue
+    if "unknown4" in callValue:
+        continue
+    if "pure" in callValue:
+        continue
+    srcloc = callInfo[1]
+    if srcloc.startswith("workdir/"): continue
+    # ignore Qt stuff
+    if srcloc.startswith("Gui/"): continue
+    if srcloc.startswith("Widgets/"): continue
+    if srcloc.startswith("Core/"): continue
+    if srcloc.startswith("/Qt"): continue
+    if srcloc.startswith("Qt"): continue
+    if srcloc.startswith("64-"): continue
+    functionSig = callInfo[0]
+    tmp1list.append((srcloc, functionSig, callValue))
+
+def merge_bitfield(a, b):
+    if len(a) == 0: return b
+    ret = ""
+    for i, c in enumerate(b):
+        if c == "1" or a[i] == "1":
+            ret += "1"
+        else:
+            ret += "0"
+    return ret;
+tmp2dict = dict()
+tmp2list = list()
+for paramInfo in paramSet:
+    name = paramInfo[0]
+    bitfield = paramInfo[1]
+    if re.match( r"\w+ com::", name): continue
+    if re.match( r"\w+ ooo::vba::", name): continue
+    if re.match( r"\w+ orcus::", name): continue
+    if re.match( r"\w+ std::", name): continue
+    if not name in tmp2dict:
+        tmp2dict[name] = bitfield
+    else:
+        tmp2dict[name] = merge_bitfield(tmp2dict[name], bitfield)
+for name, bitfield in iter(tmp2dict.items()):
+    srcloc = definitionToSourceLocationMap[name]
+    # ignore Qt stuff
+    if srcloc.startswith("Gui/"): continue
+    if srcloc.startswith("Widgets/"): continue
+    if srcloc.startswith("Core/"): continue
+    if srcloc.startswith("/Qt"): continue
+    if srcloc.startswith("Qt"): continue
+    if srcloc.startswith("64-"): continue
+    # ignore external stuff
+    if srcloc.startswith("workdir/"): continue
+    # referenced by generated code in workdir/
+    if srcloc.startswith("writerfilter/source/ooxml/OOXMLFactory.hxx"): continue
+    if "0" in bitfield:
+        tmp2list.append((srcloc, name, bitfield))
+
+# sort results by filename:lineno
+def natural_sort_key(s, _nsre=re.compile('([0-9]+)')):
+    return [int(text) if text.isdigit() else text.lower()
+            for text in re.split(_nsre, s)]
+# sort by both the source-line and the datatype, so the output file ordering is stable
+# when we have multiple items on the same source line
+def v_sort_key(v):
+    return natural_sort_key(v[0]) + [v[1]]
+tmp1list.sort(key=lambda v: v_sort_key(v))
+tmp2list.sort(key=lambda v: v_sort_key(v))
+
+# print out the results
+with open("compilerplugins/clang/virtualdead.results", "wt") as f:
+    for v in tmp1list:
+        f.write(v[0] + "\n")
+        f.write("    " + v[1] + "\n")
+        f.write("    " + v[2] + "\n")
+with open("compilerplugins/clang/virtualdead.unusedparams.results", "wt") as f:
+    for v in tmp2list:
+        f.write(v[0] + "\n")
+        f.write("    " + v[1] + "\n")
+        f.write("    " + v[2] + "\n")