c5823a2e27
Change-Id: Idab013bf2ff1f274a07911ec8b545cd26142139c Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171050 Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org> Tested-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>
266 lines
11 KiB
Python
Executable file
266 lines
11 KiB
Python
Executable file
#!/usr/bin/python3
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from collections import defaultdict
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import io
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import re
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import subprocess
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# --------------------------------------------------------------------------------------------
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# globals
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# --------------------------------------------------------------------------------------------
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definitionSet = set() # set of method_name
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definitionToSourceLocationMap = dict()
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# for the "unused methods" analysis
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callDict = defaultdict(set) # map of from_method_name -> set(method_name)
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# clang does not always use exactly the same numbers in the type-parameter vars it generates
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# so I need to substitute them to ensure we can match correctly.
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normalizeTypeParamsRegex = re.compile(r"type-parameter-\d+-\d+")
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def normalizeTypeParams( line ):
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line = normalizeTypeParamsRegex.sub("type-parameter-?-?", line)
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# make some of the types a little prettier
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line = line.replace("std::__debug", "std::")
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line = line.replace("class ", "")
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line = line.replace("struct ", "")
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line = line.replace("_Bool", "bool")
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return line
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# --------------------------------------------------------------------------------------------
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# primary input loop
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# --------------------------------------------------------------------------------------------
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cnt = 0
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with io.open("workdir/loplugin.methodcycles.log", "r", buffering=1024*1024) as txt:
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for line in txt:
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tokens = line.strip().split("\t")
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if tokens[0] == "definition:":
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returnType = tokens[1]
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nameAndParams = tokens[2]
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sourceLocation = tokens[3]
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funcInfo = (normalizeTypeParams(returnType) + " " + normalizeTypeParams(nameAndParams)).strip()
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definitionSet.add(funcInfo)
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definitionToSourceLocationMap[funcInfo] = sourceLocation
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elif tokens[0] == "call:":
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returnTypeFrom = tokens[1]
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nameAndParamsFrom = tokens[2]
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returnTypeTo = tokens[3]
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nameAndParamsTo = tokens[4]
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caller = (normalizeTypeParams(returnTypeFrom) + " " + normalizeTypeParams(nameAndParamsFrom)).strip()
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callee = (normalizeTypeParams(returnTypeTo) + " " + normalizeTypeParams(nameAndParamsTo)).strip()
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callDict[caller].add(callee)
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else:
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print( "unknown line: " + line)
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cnt = cnt + 1
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#if cnt > 100000: break
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# sort the results using a "natural order" so sequences like [item1,item2,item10] sort nicely
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def natural_sort_key(s, _nsre=re.compile('([0-9]+)')):
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return [int(text) if text.isdigit() else text.lower()
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for text in re.split(_nsre, s)]
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# sort by both the source-line and the datatype, so the output file ordering is stable
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# when we have multiple items on the same source line
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def v_sort_key(v):
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return natural_sort_key(v[1]) + [v[0]]
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def sort_set_by_natural_key(s):
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return sorted(s, key=lambda v: v_sort_key(v))
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# --------------------------------------------------------------------------------------------
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# analysis
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# --------------------------------------------------------------------------------------------
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# follow caller-callee chains, removing all methods reachable from a root method
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def remove_reachable(callDict, startCaller):
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worklist = list()
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worklist.append(startCaller)
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while len(worklist) > 0:
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caller = worklist.pop()
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if caller not in callDict:
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continue
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calleeSet = callDict[caller]
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del callDict[caller]
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if caller in definitionSet:
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definitionSet.remove(caller)
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for c in calleeSet:
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worklist.append(c)
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# look for all the external entry points and remove code called from there
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to_be_removed = set()
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to_be_removed.add("int main(int,char **)")
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# random dynload entrypoints that we don't otherwise find
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to_be_removed.add("bool TestImportOLE2(SvStream &)")
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to_be_removed.add("void SbiRuntime::StepREDIMP()")
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to_be_removed.add("_object * (anonymous namespace)::createUnoStructHelper(_object *,_object *,_object *)")
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for caller in definitionSet:
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if caller not in definitionToSourceLocationMap:
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to_be_removed.append(caller)
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continue
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location = definitionToSourceLocationMap[caller]
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if "include/com/" in location \
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or "include/cppu/" in location \
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or "include/cppuhelper/" in location \
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or "include/osl/" in location \
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or "include/rtl/" in location \
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or "include/sal/" in location \
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or "include/salhelper/" in location \
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or "include/typelib/" in location \
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or "include/uno/" in location \
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or "workdir/UnpackedTarball/" in location \
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or "workdir/UnoApiHeadersTarget/" in location \
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or "workdir/CustomTarget/officecfg/" in location \
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or "workdir/LexTarget/" in location \
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or "workdir/CustomTarget/i18npool/localedata/" in location \
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or "workdir/SdiTarget/" in location \
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or "/qa/" in location \
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or "include/test/" in location:
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to_be_removed.add(caller)
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# TODO calls to destructors are not mentioned in the AST, so we'll just have to assume they get called,
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# which is not ideal
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if "::~" in caller:
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to_be_removed.add(caller)
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# dyload entry points for VCL builder
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if "(VclPtr<vcl::Window> & rRet, const VclPtr<vcl::Window> & pParent, VclBuilder::stringmap & rMap)" in caller:
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to_be_removed.add(caller)
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if "(VclPtr<vcl::Window> &,const VclPtr<vcl::Window> &,std::::map<rtl::OString, rtl::OUString, std::less<rtl::OString>, std::allocator<std::pair<const rtl::OString, rtl::OUString> > > &)" in caller:
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to_be_removed.add(caller)
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# find all the UNO load-by-symbol-name entrypoints
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uno_constructor_entrypoints = set()
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git_grep_process = subprocess.Popen("git grep -h 'constructor=' -- *.component", stdout=subprocess.PIPE, shell=True)
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with git_grep_process.stdout as txt:
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for line in txt:
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idx1 = line.find(b"\"")
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idx2 = line.find(b"\"", idx1 + 1)
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func = line[idx1+1 : idx2]
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uno_constructor_entrypoints.add(func.decode('utf-8'))
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for caller in callDict:
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if "(com::sun::star::uno::XComponentContext *,const com::sun::star::uno::Sequence<com::sun::star::uno::Any> &)" in caller:
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for func in uno_constructor_entrypoints:
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if func in caller:
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to_be_removed.add(caller)
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# remove everything reachable from the found entry points
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for caller in to_be_removed:
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remove_reachable(callDict, caller)
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for caller in callDict:
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callDict[caller] -= to_be_removed
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# create a reverse call graph
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inverseCallDict = defaultdict(set) # map of from_method_name -> set(method_name)
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for caller in callDict:
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for callee in callDict[caller]:
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inverseCallDict[callee].add(caller)
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print_tree_recurse_set = set() # protect against cycles
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def print_tree(f, callDict, caller, depth):
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if depth == 0:
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f.write("\n") # add an empty line before each tree
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print_tree_recurse_set.clear()
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# protect against cycles
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if caller in print_tree_recurse_set:
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return
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# when printing out trees, things that are not in the map are things that are reachable,
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# so we're not interested in them
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if caller not in callDict:
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return
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print_tree_recurse_set.add(caller)
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f.write(" " * depth + caller + "\n")
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f.write(" " * depth + definitionToSourceLocationMap[caller] + "\n")
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calleeSet = callDict[caller]
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for c in calleeSet:
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print_tree(f, callDict, c, depth+1)
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# find possible roots (ie. entrypoints) by looking for methods that are not called
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def dump_possible_roots():
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possibleRootList = list()
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for caller in callDict:
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if caller not in inverseCallDict and caller in definitionToSourceLocationMap:
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possibleRootList.append(caller)
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possibleRootList.sort()
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# print out first 100 trees of caller->callees
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count = 0
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with open("compilerplugins/clang/methodcycles.roots", "wt") as f:
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f.write("callDict size " + str(len(callDict)) + "\n")
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f.write("possibleRootList size " + str(len(possibleRootList)) + "\n")
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f.write("\n")
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for caller in possibleRootList:
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f.write(caller + "\n")
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f.write(" " + definitionToSourceLocationMap[caller] + "\n")
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#print_tree(f, caller, 0)
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count = count + 1
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#if count>1000: break
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# Look for cycles in a directed graph
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# Adapted from:
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# https://codereview.stackexchange.com/questions/86021/check-if-a-directed-graph-contains-a-cycle
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def print_cycles():
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with open("compilerplugins/clang/methodcycles.results", "wt") as f:
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path = set()
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visited = set()
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def printPath(path):
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if len(path) < 2:
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return
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# we may have found a cycle, but if the cycle is called from outside the cycle
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# the code is still in use.
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for p in path:
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for caller in inverseCallDict[p]:
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if caller not in path:
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return
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f.write("found cycle\n")
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for p in path:
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f.write(" " + p + "\n")
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f.write(" " + definitionToSourceLocationMap[p] + "\n")
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f.write("\n")
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def checkCyclic(vertex):
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if vertex in visited:
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return
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visited.add(vertex)
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path.add(vertex)
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if vertex in callDict:
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for neighbour in callDict[vertex]:
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if neighbour in path:
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printPath(path)
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break
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else:
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checkCyclic(neighbour)
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path.remove(vertex)
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for caller in callDict:
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checkCyclic(caller)
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print_cycles()
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# print partitioned sub-graphs
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def print_partitions():
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callDict2 = callDict
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# Remove anything with no callees, and that is itself not called.
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# After this stage, we should only be left with closed sub-graphs ie. partitions
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while True:
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to_be_removed.clear()
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for caller in callDict2:
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if len(callDict2[caller]) == 0 \
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or caller not in inverseCallDict[caller]:
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to_be_removed.add(caller)
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if len(to_be_removed) == 0:
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break
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for caller in to_be_removed:
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remove_reachable(callDict2, caller)
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for caller in callDict2:
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callDict2[caller] -= to_be_removed
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count = 0
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with open("compilerplugins/clang/methodcycles.partition.results", "wt") as f:
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f.write("callDict size " + str(len(callDict2)) + "\n")
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f.write("\n")
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while len(callDict2) > 0:
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print_tree(f, callDict2, next(iter(callDict2)), 0)
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for c in print_tree_recurse_set:
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callDict2.pop(c, None)
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count = count + 1
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if count>1000:
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break
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print_partitions()
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