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//===- 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"
#include <iostream>
using 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)");
}
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