| //===- Hello.cpp - Example code from "Writing an LLVM Pass" ---------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 llvm { |
| |
| 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<Hello> 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<Hello2> Y("hello2", "Hello World Pass (with getAnalysisUsage implemented)"); |
| } |
| |
| } // End llvm namespace |