diff options
| -rw-r--r-- | include/llvm/Pass.h | 8 | ||||
| -rw-r--r-- | lib/VMCore/Pass.cpp | 4 |
2 files changed, 12 insertions, 0 deletions
diff --git a/include/llvm/Pass.h b/include/llvm/Pass.h index 7138fadef5..9e8976e4de 100644 --- a/include/llvm/Pass.h +++ b/include/llvm/Pass.h @@ -142,6 +142,14 @@ public: return dynamic_cast<AnalysisType*>(Resolver->getAnalysisToUpdate(PI)); } + /// mustPreserveAnalysisID - This method serves the same function as + /// getAnalysisToUpdate, but works if you just have an AnalysisID. This + /// obviously cannot give you a properly typed instance of the class if you + /// don't have the class name available (use getAnalysisToUpdate if you do), + /// but it can tell you if you need to preserve the pass at least. + /// + bool mustPreserveAnalysisID(const PassInfo *AnalysisID) const; + /// getAnalysis<AnalysisType>() - This function is used by subclasses to get /// to the analysis information that they claim to use by overriding the /// getAnalysisUsage function. diff --git a/lib/VMCore/Pass.cpp b/lib/VMCore/Pass.cpp index 96a4a3c02b..ca55b0da0a 100644 --- a/lib/VMCore/Pass.cpp +++ b/lib/VMCore/Pass.cpp @@ -142,6 +142,10 @@ void Pass::addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU) { PM->addPass(this, AU); } +bool Pass::mustPreserveAnalysisID(const PassInfo *AnalysisID) const { + return Resolver->getAnalysisToUpdate(AnalysisID) != 0; +} + // dumpPassStructure - Implement the -debug-passes=Structure option void Pass::dumpPassStructure(unsigned Offset) { std::cerr << std::string(Offset*2, ' ') << getPassName() << "\n"; |