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annotate tools/bugpoint-passes/TestPasses.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===- TestPasses.cpp - "buggy" passes used to test bugpoint --------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains "buggy" passes that are used to test bugpoint, to check
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11 // that it is narrowing down testcases correctly.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/IR/BasicBlock.h"
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16 #include "llvm/IR/Constant.h"
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17 #include "llvm/IR/Instructions.h"
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18 #include "llvm/IR/Type.h"
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19 #include "llvm/InstVisitor.h"
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20 #include "llvm/Pass.h"
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21
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22 using namespace llvm;
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23
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24 namespace {
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25 /// CrashOnCalls - This pass is used to test bugpoint. It intentionally
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26 /// crashes on any call instructions.
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27 class CrashOnCalls : public BasicBlockPass {
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28 public:
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29 static char ID; // Pass ID, replacement for typeid
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30 CrashOnCalls() : BasicBlockPass(ID) {}
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31 private:
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32 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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33 AU.setPreservesAll();
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34 }
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35
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36 bool runOnBasicBlock(BasicBlock &BB) {
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37 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
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38 if (isa<CallInst>(*I))
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39 abort();
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40
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41 return false;
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42 }
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43 };
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44 }
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45
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46 char CrashOnCalls::ID = 0;
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47 static RegisterPass<CrashOnCalls>
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48 X("bugpoint-crashcalls",
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49 "BugPoint Test Pass - Intentionally crash on CallInsts");
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50
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51 namespace {
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52 /// DeleteCalls - This pass is used to test bugpoint. It intentionally
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53 /// deletes some call instructions, "misoptimizing" the program.
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54 class DeleteCalls : public BasicBlockPass {
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55 public:
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56 static char ID; // Pass ID, replacement for typeid
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57 DeleteCalls() : BasicBlockPass(ID) {}
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58 private:
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59 bool runOnBasicBlock(BasicBlock &BB) {
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60 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
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61 if (CallInst *CI = dyn_cast<CallInst>(I)) {
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62 if (!CI->use_empty())
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63 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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64 CI->getParent()->getInstList().erase(CI);
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65 break;
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66 }
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67 return false;
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68 }
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69 };
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70 }
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71
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72 char DeleteCalls::ID = 0;
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73 static RegisterPass<DeleteCalls>
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74 Y("bugpoint-deletecalls",
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75 "BugPoint Test Pass - Intentionally 'misoptimize' CallInsts");