[llvm-dev] correct way to pass data structures between passes?

[Buse Yilmaz via llvm-dev]

Hi all,
I have a function pass which does some analysis and populates

A a;

where

typedef std::map< std::string, B* > A;

class B {
typedef std::vector< C* > D;
D d;
}

class C {
// some class packing information about basic blocks;
}

Hence I have a map of vectors traversed by string.
I wrote associated destructors for these classes. This pass works
successfully on its own.

I have another function pass needing this structure of type A to make some
transformations. I used

 bool secondPass::doInitialization(Module &M) {
   errs() << "now running secondPass\n";
   a = getAnalysis<firstPass>().getA();

      return false;
    }

void secondPass::getAnalysisUsage(AnalysisUsage &AU) const {
    AU.addRequired<firstPass>();
    AU.setPreservesAll();
  }

the whole code compiles fine. But I get  seg. fault when printing this
structure at the end of my first pass *if I call my second pass since B* is
null.*

How should I wrap this data structure and pass it to the second pass
without issues?

Thanks in advance.





-- 
Buse
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