Alexandru Ionut Diaconescu
2013-Mar-15 12:30 UTC
[LLVMdev] write a simple MachineFunctionPass
Hello everyone,
I have written several complex passes till now, but I cannot write a
MachineFunctionPass pass. It just gives me segfault. Hence I reduced the
pass to the following form :
using namespace llvm;
namespace {
class CFGexplorator : public MachineFunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
CFGexplorator() : MachineFunctionPass(ID) {
//initializeMemDepPrinterPass(*PassRegistry::getPassRegistry());
}
private:
virtual bool runOnMachineFunction(MachineFunction &MF);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
MachineFunctionPass::getAnalysisUsage(AU);
}
};
} // end anonymous namespace
char CFGexplorator::ID = 0;
static RegisterPass<CFGexplorator> Y("mycfg", "mycfg",
false, false);
bool CFGexplorator::runOnMachineFunction(MachineFunction &MF) {
return false;
}
I get the error :
Pass 'mycfg' is not initialized.
Verify if there is a pass dependency cycle.
Required Passes:
opt: PassManager.cpp:638: void
llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI &&
"Expected required passes to be initialized"' failed.
So I have to initialize the pass. But in my all other passes I did not any
initialization and I don't want to use INITIALIZE_PASS since I have to
recompile the llvm file that is keeping the pass registration... Is there a
way to keep using static RegisterPass for a MachineFunctionPass ? I mention
that if I change to FunctionPass, I have no problems and that is weird..
Thank you for any advice !
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Alexandru Ionut Diaconescu
2013-Mar-15 12:41 UTC
[LLVMdev] write a simple MachineFunctionPass
I found that : "Code generator passes are registered and initialized specially by TargetMachine::addPassesToEmitFile and similar routines, so they cannot generally be run from the *opt* or *bugpoint* commands."...So how I can run a MachineFunctionPass? In the end, I just want to apply a DFS on a CFG of a function. And I need oriented edges and wanted to use MachineBasicBlock::const_succ_iterator. It is there a way to get the CFG with oriented edges by using a FunctionPass? Thank you ! On Fri, Mar 15, 2013 at 1:30 PM, Alexandru Ionut Diaconescu < alexandruionutdiaconescu at gmail.com> wrote:> Hello everyone, > > I have written several complex passes till now, but I cannot write a > MachineFunctionPass pass. It just gives me segfault. Hence I reduced the > pass to the following form : > > > using namespace llvm; > > namespace { > class CFGexplorator : public MachineFunctionPass { > public: > static char ID; // Pass identification, replacement for typeid > CFGexplorator() : MachineFunctionPass(ID) { > //initializeMemDepPrinterPass(*PassRegistry::getPassRegistry()); > } > > private: > virtual bool runOnMachineFunction(MachineFunction &MF); > > virtual void getAnalysisUsage(AnalysisUsage &AU) const { > MachineFunctionPass::getAnalysisUsage(AU); > } > }; > } // end anonymous namespace > > char CFGexplorator::ID = 0; > static RegisterPass<CFGexplorator> Y("mycfg", "mycfg", false, false); > > bool CFGexplorator::runOnMachineFunction(MachineFunction &MF) { > return false; > } > > > > I get the error : > Pass 'mycfg' is not initialized. > Verify if there is a pass dependency cycle. > Required Passes: > opt: PassManager.cpp:638: void > llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI && > "Expected required passes to be initialized"' failed. > > > So I have to initialize the pass. But in my all other passes I did not any > initialization and I don't want to use INITIALIZE_PASS since I have to > recompile the llvm file that is keeping the pass registration... Is there a > way to keep using static RegisterPass for a MachineFunctionPass ? I mention > that if I change to FunctionPass, I have no problems and that is weird.. > > Thank you for any advice ! > > > >-- Best regards, Alexandru Ionut Diaconescu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130315/6af0d924/attachment.html>
Hi Alexandru,> I don't want to use INITIALIZE_PASS since I have to recompile the llvmfile that is keeping the pass registration... I would have encouraged you to use INITIALIZE_PASS to fix this. If you really don't want to though, I think RegisterPass is still intended to work for MachineFunctionPasses, though this may no longer be well tested. Can you attach a skeleton pass that exhibits the problem you're seeing? Cheers, Lang. On Fri, Mar 15, 2013 at 5:41 AM, Alexandru Ionut Diaconescu < alexandruionutdiaconescu at gmail.com> wrote:> I found that : "Code generator passes are registered and initialized > specially by TargetMachine::addPassesToEmitFile and similar routines, so > they cannot generally be run from the *opt* or *bugpoint* commands."...So > how I can run a MachineFunctionPass? In the end, I just want to apply a DFS > on a CFG of a function. And I need oriented edges and wanted to use > MachineBasicBlock::const_succ_iterator. It is there a way to get the CFG > with oriented edges by using a FunctionPass? > > Thank you ! > > > On Fri, Mar 15, 2013 at 1:30 PM, Alexandru Ionut Diaconescu < > alexandruionutdiaconescu at gmail.com> wrote: > >> Hello everyone, >> >> I have written several complex passes till now, but I cannot write a >> MachineFunctionPass pass. It just gives me segfault. Hence I reduced the >> pass to the following form : >> >> >> using namespace llvm; >> >> namespace { >> class CFGexplorator : public MachineFunctionPass { >> public: >> static char ID; // Pass identification, replacement for typeid >> CFGexplorator() : MachineFunctionPass(ID) { >> //initializeMemDepPrinterPass(*PassRegistry::getPassRegistry()); >> } >> >> private: >> virtual bool runOnMachineFunction(MachineFunction &MF); >> >> virtual void getAnalysisUsage(AnalysisUsage &AU) const { >> MachineFunctionPass::getAnalysisUsage(AU); >> } >> }; >> } // end anonymous namespace >> >> char CFGexplorator::ID = 0; >> static RegisterPass<CFGexplorator> Y("mycfg", "mycfg", false, false); >> >> bool CFGexplorator::runOnMachineFunction(MachineFunction &MF) { >> return false; >> } >> >> >> >> I get the error : >> Pass 'mycfg' is not initialized. >> Verify if there is a pass dependency cycle. >> Required Passes: >> opt: PassManager.cpp:638: void >> llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI && >> "Expected required passes to be initialized"' failed. >> >> >> So I have to initialize the pass. But in my all other passes I did not >> any initialization and I don't want to use INITIALIZE_PASS since I have to >> recompile the llvm file that is keeping the pass registration... Is there a >> way to keep using static RegisterPass for a MachineFunctionPass ? I mention >> that if I change to FunctionPass, I have no problems and that is weird.. >> >> Thank you for any advice ! >> >> >> >> > > > -- > Best regards, > Alexandru Ionut Diaconescu > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130328/cec93cb8/attachment.html>