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05445e30aa
SlowOperatingInfo, Statistics). Besides providing an example of how to use these facilities, it also serves to debug problems with runtime linking when dlopening a loadable module. These three support facilities exercise different combinations of Text/Weak Weak/Text and Text/Text linking between the executable and the module. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29552 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.9 KiB
C++
57 lines
1.9 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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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#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/SlowOperationInformer.h"
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#include "llvm/ADT/Statistic.h"
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#include <iostream>
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using namespace llvm;
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namespace {
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Statistic<int> HelloCounter("hellocount",
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"Counts number of functions greeted");
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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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SlowOperationInformer soi("EscapeString");
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HelloCounter++;
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std::string fname = F.getName();
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EscapeString(fname);
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std::cerr << "Hello: " << fname << "\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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SlowOperationInformer soi("EscapeString");
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HelloCounter++;
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std::string fname = F.getName();
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EscapeString(fname);
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std::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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RegisterOpt<Hello2> Y("hello2", "Hello World Pass (with getAnalysisUsage implemented)");
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}
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