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1 //===- llvm/unittest/IR/VerifierTest.cpp - Verifier unit tests ------------===//
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/DerivedTypes.h"
13 #include "llvm/IR/Function.h"
14 #include "llvm/IR/GlobalAlias.h"
15 #include "llvm/IR/GlobalVariable.h"
16 #include "llvm/IR/Instructions.h"
17 #include "llvm/IR/LLVMContext.h"
18 #include "llvm/IR/Module.h"
19 #include "gtest/gtest.h"
20 
21 namespace llvm {
22 namespace {
23 
TEST(VerifierTest,Branch_i1)24 TEST(VerifierTest, Branch_i1) {
25   LLVMContext &C = getGlobalContext();
26   Module M("M", C);
27   FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
28   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
29   BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
30   BasicBlock *Exit = BasicBlock::Create(C, "exit", F);
31   ReturnInst::Create(C, Exit);
32 
33   // To avoid triggering an assertion in BranchInst::Create, we first create
34   // a branch with an 'i1' condition ...
35 
36   Constant *False = ConstantInt::getFalse(C);
37   BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);
38 
39   // ... then use setOperand to redirect it to a value of different type.
40 
41   Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
42   BI->setOperand(0, Zero32);
43 
44   EXPECT_TRUE(verifyFunction(*F));
45 }
46 
TEST(VerifierTest,InvalidRetAttribute)47 TEST(VerifierTest, InvalidRetAttribute) {
48   LLVMContext &C = getGlobalContext();
49   Module M("M", C);
50   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
51   Function *F = cast<Function>(M.getOrInsertFunction("foo", FTy));
52   AttributeSet AS = F->getAttributes();
53   F->setAttributes(AS.addAttribute(C, AttributeSet::ReturnIndex,
54                                    Attribute::UWTable));
55 
56   std::string Error;
57   raw_string_ostream ErrorOS(Error);
58   EXPECT_TRUE(verifyModule(M, &ErrorOS));
59   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
60       "Attribute 'uwtable' only applies to functions!"));
61 }
62 
TEST(VerifierTest,CrossModuleRef)63 TEST(VerifierTest, CrossModuleRef) {
64   LLVMContext &C = getGlobalContext();
65   Module M1("M1", C);
66   Module M2("M2", C);
67   Module M3("M2", C);
68   FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
69   Function *F1 = cast<Function>(M1.getOrInsertFunction("foo1", FTy));
70   Function *F2 = cast<Function>(M2.getOrInsertFunction("foo2", FTy));
71   Function *F3 = cast<Function>(M3.getOrInsertFunction("foo3", FTy));
72 
73   BasicBlock *Entry1 = BasicBlock::Create(C, "entry", F1);
74   BasicBlock *Entry3 = BasicBlock::Create(C, "entry", F3);
75 
76   // BAD: Referencing function in another module
77   CallInst::Create(F2,"call",Entry1);
78 
79   // BAD: Referencing personality routine in another module
80   F3->setPersonalityFn(F2);
81 
82   // Fill in the body
83   Constant *ConstZero = ConstantInt::get(Type::getInt32Ty(C), 0);
84   ReturnInst::Create(C, ConstZero, Entry1);
85   ReturnInst::Create(C, ConstZero, Entry3);
86 
87   std::string Error;
88   raw_string_ostream ErrorOS(Error);
89   EXPECT_FALSE(verifyModule(M2, &ErrorOS));
90   EXPECT_TRUE(verifyModule(M1, &ErrorOS));
91   EXPECT_TRUE(StringRef(ErrorOS.str()).equals(
92       "Referencing function in another module!\n"
93       "  %call = call i32 @foo2()\n"
94       "; ModuleID = 'M1'\n"
95       "i32 ()* @foo2\n"
96       "; ModuleID = 'M2'\n"));
97 
98   Error.clear();
99   EXPECT_TRUE(verifyModule(M3, &ErrorOS));
100   EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
101       "Referencing personality function in another module!"));
102 
103   // Erase bad methods to avoid triggering an assertion failure on destruction
104   F1->eraseFromParent();
105   F3->eraseFromParent();
106 }
107 
108 
109 
110 }
111 }
112