forked from OSchip/llvm-project
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
//===- Hello.cpp - Example code from "Writing an LLVM Pass" ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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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#define DEBUG_TYPE "hello"
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#include "llvm/Pass.h"
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#include "llvm/Function.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(HelloCounter, "Counts number of functions greeted");
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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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static char ID; // Pass identification, replacement for typeid
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Hello() : FunctionPass((intptr_t)&ID) {}
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virtual bool runOnFunction(Function &F) {
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HelloCounter++;
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std::string fname = F.getName();
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EscapeString(fname);
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cerr << "Hello: " << fname << "\n";
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return false;
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}
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};
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char Hello::ID = 0;
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RegisterPass<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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static char ID; // Pass identification, replacement for typeid
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Hello2() : FunctionPass((intptr_t)&ID) {}
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virtual bool runOnFunction(Function &F) {
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HelloCounter++;
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std::string fname = F.getName();
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EscapeString(fname);
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cerr << "Hello: " << fname << "\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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char Hello2::ID = 0;
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RegisterPass<Hello2> Y("hello2",
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"Hello World Pass (with getAnalysisUsage implemented)");
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}
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