unittests/IR/VerifierTest.cpp

   1 //===- llvm/unittest/IR/VerifierTest.cpp - Verifier unit tests --*- C++ -*-===//
   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 #include "llvm/IR/Verifier.h"
  11 #include "llvm/IR/Constants.h"
  12 #include "llvm/IR/DIBuilder.h"
  13 #include "llvm/IR/DerivedTypes.h"
  14 #include "llvm/IR/Function.h"
  15 #include "llvm/IR/GlobalAlias.h"
  16 #include "llvm/IR/GlobalVariable.h"
  17 #include "llvm/IR/IRBuilder.h"
  18 #include "llvm/IR/Instructions.h"
  19 #include "llvm/IR/LLVMContext.h"
  20 #include "llvm/IR/Module.h"
  21 #include "gtest/gtest.h"
  22
  23 namespace llvm {
  24 namespace {
  25
  26 TEST(VerifierTest, Branch_i1) {
  27   LLVMContext C;
  28   Module M("M", C);
  29   FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
  30   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
  31   BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
  32   BasicBlock *Exit = BasicBlock::Create(C, "exit", F);
  33   ReturnInst::Create(C, Exit);
  34
  35   // To avoid triggering an assertion in BranchInst::Create, we first create
  36   // a branch with an 'i1' condition ...
  37
  38   Constant *False = ConstantInt::getFalse(C);
  39   BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);
  40
  41   // ... then use setOperand to redirect it to a value of different type.
  42
  43   Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
  44   BI->setOperand(0, Zero32);
  45
  46   EXPECT_TRUE(verifyFunction(*F));
  47 }
  48
  49 TEST(VerifierTest, InvalidRetAttribute) {
  50   LLVMContext C;
  51   Module M("M", C);
  52   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
  53   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
  54   AttributeList AS = F->getAttributes();
  55   F->setAttributes(
  56       AS.addAttribute(C, AttributeList::ReturnIndex, Attribute::UWTable));
  57
  58   std::string Error;
  59   raw_string_ostream ErrorOS(Error);
  60   EXPECT_TRUE(verifyModule(M, &ErrorOS));
  61   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
  62       "Attribute 'uwtable' only applies to functions!"));
  63 }
  64
  65 TEST(VerifierTest, CrossModuleRef) {
  66   LLVMContext C;
  67   Module M1("M1", C);
  68   Module M2("M2", C);
  69   Module M3("M3", C);
  70   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
  71   Function *F1 = cast<Function>(M1.getOrInsertFunction("foo1", FTy));
  72   Function *F2 = cast<Function>(M2.getOrInsertFunction("foo2", FTy));
  73   Function *F3 = cast<Function>(M3.getOrInsertFunction("foo3", FTy));
  74
  75   BasicBlock *Entry1 = BasicBlock::Create(C, "entry", F1);
  76   BasicBlock *Entry3 = BasicBlock::Create(C, "entry", F3);
  77
  78   // BAD: Referencing function in another module
  79   CallInst::Create(F2,"call",Entry1);
  80
  81   // BAD: Referencing personality routine in another module
  82   F3->setPersonalityFn(F2);
  83
  84   // Fill in the body
  85   Constant *ConstZero = ConstantInt::get(Type::getInt32Ty(C), 0);
  86   ReturnInst::Create(C, ConstZero, Entry1);
  87   ReturnInst::Create(C, ConstZero, Entry3);
  88
  89   std::string Error;
  90   raw_string_ostream ErrorOS(Error);
  91   EXPECT_TRUE(verifyModule(M2, &ErrorOS));
  92   EXPECT_TRUE(StringRef(ErrorOS.str())
  93                   .equals("Global is used by function in a different module\n"
  94                           "i32 ()* @foo2\n"
  95                           "; ModuleID = 'M2'\n"
  96                           "i32 ()* @foo3\n"
  97                           "; ModuleID = 'M3'\n"
  98                           "Global is referenced in a different module!\n"
  99                           "i32 ()* @foo2\n"
 100                           "; ModuleID = 'M2'\n"
 101                           "  %call = call i32 @foo2()\n"
 102                           "i32 ()* @foo1\n"
 103                           "; ModuleID = 'M1'\n"));
 104
 105   Error.clear();
 106   EXPECT_TRUE(verifyModule(M1, &ErrorOS));
 107   EXPECT_TRUE(StringRef(ErrorOS.str()).equals(
 108       "Referencing function in another module!\n"
 109       "  %call = call i32 @foo2()\n"
 110       "; ModuleID = 'M1'\n"
 111       "i32 ()* @foo2\n"
 112       "; ModuleID = 'M2'\n"));
 113
 114   Error.clear();
 115   EXPECT_TRUE(verifyModule(M3, &ErrorOS));
 116   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
 117       "Referencing personality function in another module!"));
 118
 119   // Erase bad methods to avoid triggering an assertion failure on destruction
 120   F1->eraseFromParent();
 121   F3->eraseFromParent();
 122 }
 123
 124 TEST(VerifierTest, InvalidVariableLinkage) {
 125   LLVMContext C;
 126   Module M("M", C);
 127   new GlobalVariable(M, Type::getInt8Ty(C), false,
 128                      GlobalValue::LinkOnceODRLinkage, nullptr, "Some Global");
 129   std::string Error;
 130   raw_string_ostream ErrorOS(Error);
 131   EXPECT_TRUE(verifyModule(M, &ErrorOS));
 132   EXPECT_TRUE(
 133       StringRef(ErrorOS.str()).startswith("Global is external, but doesn't "
 134                                           "have external or weak linkage!"));
 135 }
 136
 137 TEST(VerifierTest, InvalidFunctionLinkage) {
 138   LLVMContext C;
 139   Module M("M", C);
 140
 141   FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
 142   Function::Create(FTy, GlobalValue::LinkOnceODRLinkage, "foo", &M);
 143   std::string Error;
 144   raw_string_ostream ErrorOS(Error);
 145   EXPECT_TRUE(verifyModule(M, &ErrorOS));
 146   EXPECT_TRUE(
 147       StringRef(ErrorOS.str()).startswith("Global is external, but doesn't "
 148                                           "have external or weak linkage!"));
 149 }
 150
 151 TEST(VerifierTest, DetectInvalidDebugInfo) {
 152   {
 153     LLVMContext C;
 154     Module M("M", C);
 155     DIBuilder DIB(M);
 156     DIB.createCompileUnit(dwarf::DW_LANG_C89, DIB.createFile("broken.c", "/"),
 157                           "unittest", false, "", 0);
 158     DIB.finalize();
 159     EXPECT_FALSE(verifyModule(M));
 160
 161     // Now break it by inserting non-CU node to the list of CUs.
 162     auto *File = DIB.createFile("not-a-CU.f", ".");
 163     NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.cu");
 164     NMD->addOperand(File);
 165     EXPECT_TRUE(verifyModule(M));
 166   }
 167   {
 168     LLVMContext C;
 169     Module M("M", C);
 170     DIBuilder DIB(M);
 171     auto *CU = DIB.createCompileUnit(dwarf::DW_LANG_C89,
 172                                      DIB.createFile("broken.c", "/"),
 173                                      "unittest", false, "", 0);
 174     new GlobalVariable(M, Type::getInt8Ty(C), false,
 175                        GlobalValue::ExternalLinkage, nullptr, "g");
 176
 177     auto *F = cast<Function>(M.getOrInsertFunction(
 178         "f", FunctionType::get(Type::getVoidTy(C), false)));
 179     IRBuilder<> Builder(BasicBlock::Create(C, "", F));
 180     Builder.CreateUnreachable();
 181     F->setSubprogram(DIB.createFunction(CU, "f", "f",
 182                                         DIB.createFile("broken.c", "/"), 1,
 183                                         nullptr, true, true, 1));
 184     DIB.finalize();
 185     EXPECT_FALSE(verifyModule(M));
 186
 187     // Now break it by not listing the CU at all.
 188     M.eraseNamedMetadata(M.getOrInsertNamedMetadata("llvm.dbg.cu"));
 189     EXPECT_TRUE(verifyModule(M));
 190   }
 191 }
 192
 193 } // end anonymous namespace
 194 } // end namespace llvm