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/Instructions.h"
18 #include "llvm/IR/LLVMContext.h"
19 #include "llvm/IR/Module.h"
20 #include "gtest/gtest.h"
21 
22 namespace llvm {
23 namespace {
24 
25 TEST(VerifierTest, Branch_i1) {
26   LLVMContext &C = getGlobalContext();
27   Module M("M", C);
28   FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
29   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
30   BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
31   BasicBlock *Exit = BasicBlock::Create(C, "exit", F);
32   ReturnInst::Create(C, Exit);
33 
34   // To avoid triggering an assertion in BranchInst::Create, we first create
35   // a branch with an 'i1' condition ...
36 
37   Constant *False = ConstantInt::getFalse(C);
38   BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);
39 
40   // ... then use setOperand to redirect it to a value of different type.
41 
42   Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
43   BI->setOperand(0, Zero32);
44 
45   EXPECT_TRUE(verifyFunction(*F));
46 }
47 
48 TEST(VerifierTest, InvalidRetAttribute) {
49   LLVMContext &C = getGlobalContext();
50   Module M("M", C);
51   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
52   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
53   AttributeSet AS = F->getAttributes();
54   F->setAttributes(AS.addAttribute(C, AttributeSet::ReturnIndex,
55                                    Attribute::UWTable));
56 
57   std::string Error;
58   raw_string_ostream ErrorOS(Error);
59   EXPECT_TRUE(verifyModule(M, &ErrorOS));
60   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
61       "Attribute 'uwtable' only applies to functions!"));
62 }
63 
64 TEST(VerifierTest, CrossModuleRef) {
65   LLVMContext &C = getGlobalContext();
66   Module M1("M1", C);
67   Module M2("M2", C);
68   Module M3("M3", C);
69   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
70   Function *F1 = cast<Function>(M1.getOrInsertFunction("foo1", FTy));
71   Function *F2 = cast<Function>(M2.getOrInsertFunction("foo2", FTy));
72   Function *F3 = cast<Function>(M3.getOrInsertFunction("foo3", FTy));
73 
74   BasicBlock *Entry1 = BasicBlock::Create(C, "entry", F1);
75   BasicBlock *Entry3 = BasicBlock::Create(C, "entry", F3);
76 
77   // BAD: Referencing function in another module
78   CallInst::Create(F2,"call",Entry1);
79 
80   // BAD: Referencing personality routine in another module
81   F3->setPersonalityFn(F2);
82 
83   // Fill in the body
84   Constant *ConstZero = ConstantInt::get(Type::getInt32Ty(C), 0);
85   ReturnInst::Create(C, ConstZero, Entry1);
86   ReturnInst::Create(C, ConstZero, Entry3);
87 
88   std::string Error;
89   raw_string_ostream ErrorOS(Error);
90   EXPECT_TRUE(verifyModule(M2, &ErrorOS));
91   EXPECT_TRUE(StringRef(ErrorOS.str())
92                   .equals("Global is used by function in a different module\n"
93                           "i32 ()* @foo2\n"
94                           "; ModuleID = 'M2'\n"
95                           "i32 ()* @foo3\n"
96                           "; ModuleID = 'M3'\n"
97                           "Global is referenced in a different module!\n"
98                           "i32 ()* @foo2\n"
99                           "; ModuleID = 'M2'\n"
100                           "  %call = call i32 @foo2()\n"
101                           "i32 ()* @foo1\n"
102                           "; ModuleID = 'M1'\n"));
103 
104   Error.clear();
105   EXPECT_TRUE(verifyModule(M1, &ErrorOS));
106   EXPECT_TRUE(StringRef(ErrorOS.str()).equals(
107       "Referencing function in another module!\n"
108       "  %call = call i32 @foo2()\n"
109       "; ModuleID = 'M1'\n"
110       "i32 ()* @foo2\n"
111       "; ModuleID = 'M2'\n"));
112 
113   Error.clear();
114   EXPECT_TRUE(verifyModule(M3, &ErrorOS));
115   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
116       "Referencing personality function in another module!"));
117 
118   // Erase bad methods to avoid triggering an assertion failure on destruction
119   F1->eraseFromParent();
120   F3->eraseFromParent();
121 }
122 
123 TEST(VerifierTest, CrossModuleMetadataRef) {
124   LLVMContext &C = getGlobalContext();
125   Module M1("M1", C);
126   Module M2("M2", C);
127   GlobalVariable *newGV =
128       new GlobalVariable(M1, Type::getInt8Ty(C), false,
129                          GlobalVariable::ExternalLinkage, nullptr,
130                          "Some Global");
131 
132   DIBuilder dbuilder(M2);
133   auto CU = dbuilder.createCompileUnit(dwarf::DW_LANG_Julia, "test.jl", ".",
134                                        "unittest", false, "", 0);
135   auto File = dbuilder.createFile("test.jl", ".");
136   auto Ty = dbuilder.createBasicType("Int8", 8, 8, dwarf::DW_ATE_signed);
137   dbuilder.createGlobalVariable(CU, "_SOME_GLOBAL", "_SOME_GLOBAL", File, 1, Ty,
138                                 false, newGV);
139   dbuilder.finalize();
140 
141   std::string Error;
142   raw_string_ostream ErrorOS(Error);
143   EXPECT_TRUE(verifyModule(M2, &ErrorOS));
144   EXPECT_TRUE(StringRef(ErrorOS.str())
145                   .startswith("Referencing global in another module!"));
146 }
147 } // end anonymous namespace
148 } // end namespace llvm
149