1 //===- TestPasses.cpp - "buggy" passes used to test bugpoint --------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains "buggy" passes that are used to test bugpoint, to check 11 // that it is narrowing down testcases correctly. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/BasicBlock.h" 16 #include "llvm/Constant.h" 17 #include "llvm/Instructions.h" 18 #include "llvm/Pass.h" 19 #include "llvm/Type.h" 20 #include "llvm/Support/InstVisitor.h" 21 22 using namespace llvm; 23 24 namespace { 25 /// CrashOnCalls - This pass is used to test bugpoint. It intentionally 26 /// crashes on any call instructions. 27 class CrashOnCalls : public BasicBlockPass { 28 public: 29 static char ID; // Pass ID, replacement for typeid 30 CrashOnCalls() : BasicBlockPass(ID) {} 31 private: 32 virtual void getAnalysisUsage(AnalysisUsage &AU) const { 33 AU.setPreservesAll(); 34 } 35 36 bool runOnBasicBlock(BasicBlock &BB) { 37 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I) 38 if (isa<CallInst>(*I)) 39 abort(); 40 41 return false; 42 } 43 }; 44 } 45 46 char CrashOnCalls::ID = 0; 47 static RegisterPass<CrashOnCalls> 48 X("bugpoint-crashcalls", 49 "BugPoint Test Pass - Intentionally crash on CallInsts"); 50 51 namespace { 52 /// DeleteCalls - This pass is used to test bugpoint. It intentionally 53 /// deletes some call instructions, "misoptimizing" the program. 54 class DeleteCalls : public BasicBlockPass { 55 public: 56 static char ID; // Pass ID, replacement for typeid 57 DeleteCalls() : BasicBlockPass(ID) {} 58 private: 59 bool runOnBasicBlock(BasicBlock &BB) { 60 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I) 61 if (CallInst *CI = dyn_cast<CallInst>(I)) { 62 if (!CI->use_empty()) 63 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType())); 64 CI->getParent()->getInstList().erase(CI); 65 break; 66 } 67 return false; 68 } 69 }; 70 } 71 72 char DeleteCalls::ID = 0; 73 static RegisterPass<DeleteCalls> 74 Y("bugpoint-deletecalls", 75 "BugPoint Test Pass - Intentionally 'misoptimize' CallInsts"); 76
