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annotate tools/bugpoint-passes/TestPasses.cpp @ 171:66f3bfe93da9

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git version 2c4ca6832fa6b306ee6a7010bfb80a3f2596f824
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 11:07:02 +0900
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171
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1 //===- TestPasses.cpp - "buggy" passes used to test bugpoint --------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file contains "buggy" passes that are used to test bugpoint, to check
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10 // that it is narrowing down testcases correctly.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/IR/BasicBlock.h"
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15 #include "llvm/IR/Constant.h"
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16 #include "llvm/IR/InstVisitor.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/Pass.h"
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20
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21 using namespace llvm;
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22
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23 namespace {
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24 /// CrashOnCalls - This pass is used to test bugpoint. It intentionally
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25 /// crashes on any call instructions.
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26 class CrashOnCalls : public BasicBlockPass {
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27 public:
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28 static char ID; // Pass ID, replacement for typeid
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29 CrashOnCalls() : BasicBlockPass(ID) {}
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30 private:
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31 void getAnalysisUsage(AnalysisUsage &AU) const override {
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32 AU.setPreservesAll();
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33 }
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34
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35 bool runOnBasicBlock(BasicBlock &BB) override {
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36 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
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37 if (isa<CallInst>(*I))
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38 abort();
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39
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40 return false;
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41 }
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42 };
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43 }
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44
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45 char CrashOnCalls::ID = 0;
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46 static RegisterPass<CrashOnCalls>
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47 X("bugpoint-crashcalls",
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48 "BugPoint Test Pass - Intentionally crash on CallInsts");
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49
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50 namespace {
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51 /// DeleteCalls - This pass is used to test bugpoint. It intentionally
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52 /// deletes some call instructions, "misoptimizing" the program.
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53 class DeleteCalls : public BasicBlockPass {
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54 public:
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55 static char ID; // Pass ID, replacement for typeid
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56 DeleteCalls() : BasicBlockPass(ID) {}
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57 private:
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58 bool runOnBasicBlock(BasicBlock &BB) override {
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59 for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
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60 if (CallInst *CI = dyn_cast<CallInst>(I)) {
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61 if (!CI->use_empty())
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62 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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63 CI->getParent()->getInstList().erase(CI);
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64 break;
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65 }
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66 return false;
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67 }
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68 };
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69 }
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70
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71 char DeleteCalls::ID = 0;
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72 static RegisterPass<DeleteCalls>
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73 Y("bugpoint-deletecalls",
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74 "BugPoint Test Pass - Intentionally 'misoptimize' CallInsts");
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75
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76 namespace {
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77 /// CrashOnDeclFunc - This pass is used to test bugpoint. It intentionally
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78 /// crashes if the module has an undefined function (ie a function that is
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79 /// defined in an external module).
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80 class CrashOnDeclFunc : public ModulePass {
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81 public:
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82 static char ID; // Pass ID, replacement for typeid
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83 CrashOnDeclFunc() : ModulePass(ID) {}
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84
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85 private:
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86 bool runOnModule(Module &M) override {
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87 for (auto &F : M.functions()) {
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88 if (F.isDeclaration())
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89 abort();
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90 }
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91 return false;
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92 }
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93 };
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94 }
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95
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96 char CrashOnDeclFunc::ID = 0;
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97 static RegisterPass<CrashOnDeclFunc>
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98 Z("bugpoint-crash-decl-funcs",
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99 "BugPoint Test Pass - Intentionally crash on declared functions");
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100
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101 namespace {
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102 /// CrashOnOneCU - This pass is used to test bugpoint. It intentionally
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103 /// crashes if the Module has two or more compile units
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104 class CrashOnTooManyCUs : public ModulePass {
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105 public:
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106 static char ID;
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107 CrashOnTooManyCUs() : ModulePass(ID) {}
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108
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109 private:
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110 bool runOnModule(Module &M) override {
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111 NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
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112 if (!CU_Nodes)
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113 return false;
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114 if (CU_Nodes->getNumOperands() >= 2)
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115 abort();
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116 return false;
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117 }
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118 };
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119 }
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120
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121 char CrashOnTooManyCUs::ID = 0;
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122 static RegisterPass<CrashOnTooManyCUs>
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123 A("bugpoint-crash-too-many-cus",
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124 "BugPoint Test Pass - Intentionally crash on too many CUs");
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125
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126 namespace {
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127 class CrashOnFunctionAttribute : public FunctionPass {
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128 public:
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129 static char ID; // Pass ID, replacement for typeid
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130 CrashOnFunctionAttribute() : FunctionPass(ID) {}
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131
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132 private:
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133 void getAnalysisUsage(AnalysisUsage &AU) const override {
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134 AU.setPreservesAll();
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135 }
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136
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137 bool runOnFunction(Function &F) override {
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138 AttributeSet A = F.getAttributes().getFnAttributes();
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139 if (A.hasAttribute("bugpoint-crash"))
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140 abort();
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141 return false;
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142 }
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143 };
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144 } // namespace
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145
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146 char CrashOnFunctionAttribute::ID = 0;
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147 static RegisterPass<CrashOnFunctionAttribute>
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148 B("bugpoint-crashfuncattr", "BugPoint Test Pass - Intentionally crash on "
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149 "function attribute 'bugpoint-crash'");