forked from OSchip/llvm-project
35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
//===- Hello.cpp - Example code from "Writing an LLVM Pass" ---------------===//
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//
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// This file implements two versions of the LLVM "Hello World" pass described
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// in docs/WritingAnLLVMPass.html
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Pass.h"
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#include "llvm/Function.h"
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namespace {
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// Hello - The first implementation, without getAnalysisUsage.
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struct Hello : public FunctionPass {
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virtual bool runOnFunction(Function &F) {
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std::cerr << "Hello: " << F.getName() << "\n";
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return false;
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}
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};
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RegisterOpt<Hello> X("hello", "Hello World Pass");
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// Hello2 - The second implementation with getAnalysisUsage implemented.
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struct Hello2 : public FunctionPass {
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virtual bool runOnFunction(Function &F) {
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std::cerr << "Hello: " << F.getName() << "\n";
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return false;
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}
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// We don't modify the program, so we preserve all analyses
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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};
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};
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RegisterOpt<Hello2> Y("hello2", "Hello World Pass (with getAnalysisUsage implemented)");
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}
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