Hello,
I have a Problem I just can not understand. I want to reduce the Module to
the Subgraph which has a given function as root.
I first calculate a list of functions I want to keep:
//Find all called functions from this CallNode recursively
std::vector<llvm::Function*> calledFunctionsFromEntryPointList;
calcCalledFunctionsFromEntryPoint(entry,
&calledFunctionsFromEntryPointList);
Then I am dropping all calls to CallGraphNodes not in the list and try to
delete them afterwards.
//Drop calls //TODO
for (llvm::CallGraph::iterator G = callGraph.begin(), end
callGraph.end(); G != end; ++G) {
if(G->second->getFunction())
{
if(std::find(calledFunctionsFromEntryPointList.begin(),calledFunctionsFromEntryPointList.end(),G->second->getFunction())
== calledFunctionsFromEntryPointList.end())
{
std::cout << "Function:" <<
G->second->getFunction()->getName().str() << " not in call
List dropping
called functions\n";
G->second->removeAllCalledFunctions();
}
}
else {
for (llvm::CallGraphNode::const_iterator CI
G->second->begin(), CE = G->second->end(); CI != CE; ++CI) {
if(std::find(calledFunctionsFromEntryPointList.begin(),calledFunctionsFromEntryPointList.end(),CI->second->getFunction())
== calledFunctionsFromEntryPointList.end())
{
if(CI->second->getFunction()){
G->second->removeAnyCallEdgeTo(CI->second);
}
}
}
}
}
//TODO Somehow there is a Bug that sometimes a Function after
dropping calls is no longer a function and does not get deleted
//Drop not called functions //TODO
for (llvm::CallGraph::iterator G = callGraph.begin(), end
callGraph.end(); G != end; ++G) {
if(G->second->getFunction())
{
if(std::find(calledFunctionsFromEntryPointList.begin(),calledFunctionsFromEntryPointList.end(),G->second->getFunction())
== calledFunctionsFromEntryPointList.end())
{
std::cout << "Function:" <<
G->second->getFunction()->getName().str() << " not in call
List deleting
it\n";
G->second->getFunction()->dropAllReferences();
callGraph.removeFunctionFromModule(G->second);
}
}
}
The Problem now is that somehow functions become something else and i can
not delete them.
However they are still in the list as they can be found with the iterator
and addressed with the Callgraph node.
for (llvm::Module::iterator F = callGraph.getModule().begin(), end
callGraph.getModule().end(); F != end; ++F) {
if(std::find(calledFunctionsFromEntryPointList.begin(),calledFunctionsFromEntryPointList.end(),F)
== calledFunctionsFromEntryPointList.end()){
std::cout << "Found Bug Function: " <<
callGraph[F]->getFunction()->getName().str() << std::endl;
callGraph[F]->getFunction()->dropAllReferences();
callGraph.getModule().getFunctionList().remove(F);
}
}
If I however try to delete it from the Callgraph instead just from the List
with:
callGraph.removeFunctionFromModule(callGraph[F]);
I get a Segmentation fault.
And to make it even less understandable if I run the same code again I find
new function not found in the first round.
for (llvm::Module::iterator F = callGraph.getModule().begin(), end
callGraph.getModule().end(); F != end; ++F) {
if(std::find(calledFunctionsFromEntryPointList.begin(),calledFunctionsFromEntryPointList.end(),F)
== calledFunctionsFromEntryPointList.end()){
std::cout << "Found Bug Function: " <<
callGraph[F]->getFunction()->getName().str() << std::endl;
callGraph[F]->getFunction()->dropAllReferences();
callGraph.getModule().getFunctionList().remove(F);
}
}
Any help is appreciated.
Many Thanks
Andreas
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20141219/aee108cf/attachment.html>