diff --git a/lib/Transforms/Hello/Hello.cpp b/lib/Transforms/Hello/Hello.cpp new file mode 100644 index 00000000000..6ca450f0078 --- /dev/null +++ b/lib/Transforms/Hello/Hello.cpp @@ -0,0 +1,34 @@ +//===- Hello.cpp - Example code from "Writing an LLVM Pass" ---------------===// +// +// This file implements two versions of the LLVM "Hello World" pass described +// in docs/WritingAnLLVMPass.html +// +//===----------------------------------------------------------------------===// + +#include "llvm/Pass.h" +#include "llvm/Function.h" + +namespace { + // Hello - The first implementation, without getAnalysisUsage. + struct Hello : public FunctionPass { + virtual bool runOnFunction(Function &F) { + std::cerr << "Hello: " << F.getName() << "\n"; + return false; + } + }; + RegisterOpt X("hello", "Hello World Pass"); + + // Hello2 - The second implementation with getAnalysisUsage implemented. + struct Hello2 : public FunctionPass { + virtual bool runOnFunction(Function &F) { + std::cerr << "Hello: " << F.getName() << "\n"; + return false; + } + + // We don't modify the program, so we preserve all analyses + virtual void getAnalysisUsage(AnalysisUsage &AU) const { + AU.setPreservesAll(); + }; + }; + RegisterOpt Y("hello2", "Hello World Pass (with getAnalysisUsage implemented)"); +} diff --git a/lib/Transforms/Hello/Makefile b/lib/Transforms/Hello/Makefile new file mode 100644 index 00000000000..0a4746d69f7 --- /dev/null +++ b/lib/Transforms/Hello/Makefile @@ -0,0 +1,6 @@ +LEVEL = ../../.. +LIBRARYNAME = hello +SHARED_LIBRARY = 1 + +include $(LEVEL)/Makefile.common +