1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
//===- InjectorIRStrategyTest.cpp - Tests for injector strategy -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringRef.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/AsmParser/SlotMapping.h"
#include "llvm/FuzzMutate/IRMutator.h"
#include "llvm/FuzzMutate/Operations.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
static constexpr int Seed = 5;
namespace {
std::unique_ptr<IRMutator> createInjectorMutator() {
std::vector<TypeGetter> Types{
Type::getInt1Ty, Type::getInt8Ty, Type::getInt16Ty, Type::getInt32Ty,
Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
Strategies.push_back(
std::make_unique<InjectorIRStrategy>(
InjectorIRStrategy::getDefaultOps()));
return std::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
}
std::unique_ptr<IRMutator> createDeleterMutator() {
std::vector<TypeGetter> Types{
Type::getInt1Ty, Type::getInt8Ty, Type::getInt16Ty, Type::getInt32Ty,
Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
Strategies.push_back(std::make_unique<InstDeleterIRStrategy>());
return std::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
}
std::unique_ptr<IRMutator> createInstModifierMutator() {
std::vector<TypeGetter> Types{
Type::getInt1Ty, Type::getInt8Ty, Type::getInt16Ty, Type::getInt32Ty,
Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
Strategies.push_back(std::make_unique<InstModificationIRStrategy>());
return std::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
}
std::unique_ptr<Module> parseAssembly(
const char *Assembly, LLVMContext &Context) {
SMDiagnostic Error;
std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
std::string ErrMsg;
raw_string_ostream OS(ErrMsg);
Error.print("", OS);
assert(M && !verifyModule(*M, &errs()));
return M;
}
void IterateOnSource(StringRef Source, IRMutator &Mutator) {
LLVMContext Ctx;
for (int i = 0; i < 10; ++i) {
auto M = parseAssembly(Source.data(), Ctx);
ASSERT_TRUE(M && !verifyModule(*M, &errs()));
Mutator.mutateModule(*M, Seed, Source.size(), Source.size() + 100);
EXPECT_TRUE(!verifyModule(*M, &errs()));
}
}
TEST(InjectorIRStrategyTest, EmptyModule) {
// Test that we can inject into empty module
LLVMContext Ctx;
auto M = std::make_unique<Module>("M", Ctx);
ASSERT_TRUE(M && !verifyModule(*M, &errs()));
auto Mutator = createInjectorMutator();
ASSERT_TRUE(Mutator);
Mutator->mutateModule(*M, Seed, 1, 1);
EXPECT_TRUE(!verifyModule(*M, &errs()));
}
TEST(InstDeleterIRStrategyTest, EmptyFunction) {
// Test that we don't crash even if we can't remove from one of the functions.
StringRef Source = ""
"define <8 x i32> @func1() {\n"
"ret <8 x i32> undef\n"
"}\n"
"\n"
"define i32 @func2() {\n"
"%A9 = alloca i32\n"
"%L6 = load i32, i32* %A9\n"
"ret i32 %L6\n"
"}\n";
auto Mutator = createDeleterMutator();
ASSERT_TRUE(Mutator);
IterateOnSource(Source, *Mutator);
}
TEST(InstDeleterIRStrategyTest, PhiNodes) {
// Test that inst deleter works correctly with the phi nodes.
LLVMContext Ctx;
StringRef Source = "\n\
define i32 @earlyreturncrash(i32 %x) {\n\
entry:\n\
switch i32 %x, label %sw.epilog [\n\
i32 1, label %sw.bb1\n\
]\n\
\n\
sw.bb1:\n\
br label %sw.epilog\n\
\n\
sw.epilog:\n\
%a.0 = phi i32 [ 7, %entry ], [ 9, %sw.bb1 ]\n\
%b.0 = phi i32 [ 10, %entry ], [ 4, %sw.bb1 ]\n\
ret i32 %a.0\n\
}";
auto Mutator = createDeleterMutator();
ASSERT_TRUE(Mutator);
IterateOnSource(Source, *Mutator);
}
static void checkModifyNoUnsignedAndNoSignedWrap(StringRef Opc) {
LLVMContext Ctx;
std::string Source = std::string("\n\
define i32 @test(i32 %x) {\n\
%a = ") + Opc.str() +
std::string(" i32 %x, 10\n\
ret i32 %a\n\
}");
auto Mutator = createInstModifierMutator();
ASSERT_TRUE(Mutator);
auto M = parseAssembly(Source.data(), Ctx);
auto &F = *M->begin();
auto *AddI = &*F.begin()->begin();
ASSERT_TRUE(M && !verifyModule(*M, &errs()));
bool FoundNUW = false;
bool FoundNSW = false;
for (int i = 0; i < 100; ++i) {
Mutator->mutateModule(*M, Seed + i, Source.size(), Source.size() + 100);
EXPECT_TRUE(!verifyModule(*M, &errs()));
FoundNUW |= AddI->hasNoUnsignedWrap();
FoundNSW |= AddI->hasNoSignedWrap();
}
// The mutator should have added nuw and nsw during some mutations.
EXPECT_TRUE(FoundNUW);
EXPECT_TRUE(FoundNSW);
}
TEST(InstModificationIRStrategyTest, Add) {
checkModifyNoUnsignedAndNoSignedWrap("add");
}
TEST(InstModificationIRStrategyTest, Sub) {
checkModifyNoUnsignedAndNoSignedWrap("sub");
}
TEST(InstModificationIRStrategyTest, Mul) {
checkModifyNoUnsignedAndNoSignedWrap("mul");
}
TEST(InstModificationIRStrategyTest, Shl) {
checkModifyNoUnsignedAndNoSignedWrap("shl");
}
TEST(InstModificationIRStrategyTest, ICmp) {
LLVMContext Ctx;
StringRef Source = "\n\
define i1 @test(i32 %x) {\n\
%a = icmp eq i32 %x, 10\n\
ret i1 %a\n\
}";
auto Mutator = createInstModifierMutator();
ASSERT_TRUE(Mutator);
auto M = parseAssembly(Source.data(), Ctx);
auto &F = *M->begin();
CmpInst *CI = cast<CmpInst>(&*F.begin()->begin());
ASSERT_TRUE(M && !verifyModule(*M, &errs()));
bool FoundNE = false;
for (int i = 0; i < 100; ++i) {
Mutator->mutateModule(*M, Seed + i, Source.size(), Source.size() + 100);
EXPECT_TRUE(!verifyModule(*M, &errs()));
FoundNE |= CI->getPredicate() == CmpInst::ICMP_NE;
}
EXPECT_TRUE(FoundNE);
}
TEST(InstModificationIRStrategyTest, GEP) {
LLVMContext Ctx;
StringRef Source = "\n\
define i32* @test(i32* %ptr) {\n\
%gep = getelementptr i32, i32* %ptr, i32 10\n\
ret i32* %gep\n\
}";
auto Mutator = createInstModifierMutator();
ASSERT_TRUE(Mutator);
auto M = parseAssembly(Source.data(), Ctx);
auto &F = *M->begin();
GetElementPtrInst *GEP = cast<GetElementPtrInst>(&*F.begin()->begin());
ASSERT_TRUE(M && !verifyModule(*M, &errs()));
bool FoundInbounds = false;
for (int i = 0; i < 100; ++i) {
Mutator->mutateModule(*M, Seed + i, Source.size(), Source.size() + 100);
EXPECT_TRUE(!verifyModule(*M, &errs()));
FoundInbounds |= GEP->isInBounds();
}
EXPECT_TRUE(FoundInbounds);
}
}
|
