[LLVMdev] Trouble with using PassManager to execute custom passes that have dependencies.

Paul Vario paul.paul.mit at gmail.com
Thu Jan 23 16:15:55 PST 2014


    I wrote my own FunctionPass that depends on DominatorTree and LoopInfo
passes. Then my own pass is executed outside the LLVM optimizer
infrastructure (I.e., in a main file). However, I got the following error:

LLVM/llvm-3.3.src/lib/IR/PassManager.cpp:637: void
llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI &&
"Expected required passes to be initialized"' failed.

    Since the pass was not executed by opt, I took it that I did not need
to register the pass or modify the LLVM code base to accommodate it ...
Then I try to fix the problem by calling INITIALIZE_PASS_DEPENDENCY right
after char XXXPass::ID=0. Then the compiler complains something about it
has to be declared inside the llvm namespace. Any hints on how to fix that?

Best Regards,

--------------------------- Code -----------------------------------

using namespace llvm;

class XXXPass : public FunctionPass {
  XXXPass() : FunctionPass(ID) {}

  void getAnalysisUsage(AnalysisUsage &AU) const {
  virtual bool runOnFunction(Function &F) {
      DominatorTree *DT = &getAnalysis<DominatorTree>();
      LoopInfo *li = &getAnalysis<LoopInfo>();
      return false;
  static char ID;

char XXXPass::ID = 0;

int main(int argc, char **argv) {
  SMDiagnostic Err;
  Module *Mod = ParseIRFile(argv[2], Err, getGlobalContext());
  if (!Mod) {
    Err.print(argv[0], errs());
    return 1;
  Function *Func = Mod->getFunction("test");

  PassManager PM;
  PM.add(new XXXPass());
  return 0;
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