[LLVMdev] About writing a modulePass in addPreEmitPass() for NVPTX

[Antony Yu]

I try to use INITIALIZE_PASS instead of RegisterPass<> to register my pass,
though I don't understand what's their difference and how it works because
its documents doesn't exist. But it still doesn't work.

Parts of my codes is as follows:

in  NVPTXTest.h

namespace llvm {

void initializeNVPTXTestPass(PassRegistry &r);

class NVPTXTest : public ModulePass
{
public:

    NVPTXTest() : ModulePass(ID){
        initializeNVPTXTestPass(*PassRegistry::getPassRegistry());
    }
    void getAnalysisUsage(AnalysisUsage &AU) const {
        AU.setPreservesAll();
        ModulePass::getAnalysisUsage(AU);
    }

};

in NVPTXTest.cpp

#include "NVPTXTest.h"

namespace llvm
{
    //static RegisterPass<NVPTXTest> X("test", "Test Module Pass");
    char NVPTXTest::ID = 0;
    ModulePass *createTest()
    {
        return new NVPTXTest();
    }
}
using namespace llvm;

INITIALIZE_PASS(NVPTXTest, "test", "TestModule Pass", true, true);
====
When I use the same way to write a CallGraphSCCPass, it still doesn't work,
but this time it tells me that my CallGraphSCCPass is not initialized
instead of 'NVPTX Assembly Printer'.
It's really weird...




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