unittests/FuzzMutate/StrategiesTest.cpp

   1 //===- InjectorIRStrategyTest.cpp - Tests for injector strategy -----------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ADT/StringRef.h"
  10 #include "llvm/AsmParser/Parser.h"
  11 #include "llvm/AsmParser/SlotMapping.h"
  12 #include "llvm/FuzzMutate/IRMutator.h"
  13 #include "llvm/FuzzMutate/Operations.h"
  14 #include "llvm/IR/Instructions.h"
  15 #include "llvm/IR/LLVMContext.h"
  16 #include "llvm/IR/Module.h"
  17 #include "llvm/IR/Verifier.h"
  18 #include "llvm/Support/SourceMgr.h"
  19
  20 #include "gtest/gtest.h"
  21
  22 using namespace llvm;
  23
  24 static constexpr int Seed = 5;
  25
  26 namespace {
  27
  28 std::unique_ptr<IRMutator> createInjectorMutator() {
  29   std::vector<TypeGetter> Types{
  30       Type::getInt1Ty,  Type::getInt8Ty,  Type::getInt16Ty, Type::getInt32Ty,
  31       Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
  32
  33   std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
  34   Strategies.push_back(
  35       llvm::make_unique<InjectorIRStrategy>(
  36           InjectorIRStrategy::getDefaultOps()));
  37
  38   return llvm::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
  39 }
  40
  41 std::unique_ptr<IRMutator> createDeleterMutator() {
  42   std::vector<TypeGetter> Types{
  43       Type::getInt1Ty,  Type::getInt8Ty,  Type::getInt16Ty, Type::getInt32Ty,
  44       Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
  45
  46   std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
  47   Strategies.push_back(llvm::make_unique<InstDeleterIRStrategy>());
  48
  49   return llvm::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
  50 }
  51
  52 std::unique_ptr<Module> parseAssembly(
  53     const char *Assembly, LLVMContext &Context) {
  54
  55   SMDiagnostic Error;
  56   std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
  57
  58   std::string ErrMsg;
  59   raw_string_ostream OS(ErrMsg);
  60   Error.print("", OS);
  61
  62   assert(M && !verifyModule(*M, &errs()));
  63   return M;
  64 }
  65
  66 void IterateOnSource(StringRef Source, IRMutator &Mutator) {
  67   LLVMContext Ctx;
  68
  69   for (int i = 0; i < 10; ++i) {
  70     auto M = parseAssembly(Source.data(), Ctx);
  71     ASSERT_TRUE(M && !verifyModule(*M, &errs()));
  72
  73     Mutator.mutateModule(*M, Seed, Source.size(), Source.size() + 100);
  74     EXPECT_TRUE(!verifyModule(*M, &errs()));
  75   }
  76 }
  77
  78 TEST(InjectorIRStrategyTest, EmptyModule) {
  79   // Test that we can inject into empty module
  80
  81   LLVMContext Ctx;
  82   auto M = llvm::make_unique<Module>("M", Ctx);
  83   ASSERT_TRUE(M && !verifyModule(*M, &errs()));
  84
  85   auto Mutator = createInjectorMutator();
  86   ASSERT_TRUE(Mutator);
  87
  88   Mutator->mutateModule(*M, Seed, 1, 1);
  89   EXPECT_TRUE(!verifyModule(*M, &errs()));
  90 }
  91
  92 TEST(InstDeleterIRStrategyTest, EmptyFunction) {
  93   // Test that we don't crash even if we can't remove from one of the functions.
  94
  95   StringRef Source = ""
  96       "define <8 x i32> @func1() {\n"
  97         "ret <8 x i32> undef\n"
  98       "}\n"
  99       "\n"
 100       "define i32 @func2() {\n"
 101         "%A9 = alloca i32\n"
 102         "%L6 = load i32, i32* %A9\n"
 103         "ret i32 %L6\n"
 104       "}\n";
 105
 106   auto Mutator = createDeleterMutator();
 107   ASSERT_TRUE(Mutator);
 108
 109   IterateOnSource(Source, *Mutator);
 110 }
 111
 112 TEST(InstDeleterIRStrategyTest, PhiNodes) {
 113   // Test that inst deleter works correctly with the phi nodes.
 114
 115   LLVMContext Ctx;
 116   StringRef Source = "\n\
 117       define i32 @earlyreturncrash(i32 %x) {\n\
 118       entry:\n\
 119         switch i32 %x, label %sw.epilog [\n\
 120           i32 1, label %sw.bb1\n\
 121         ]\n\
 122       \n\
 123       sw.bb1:\n\
 124         br label %sw.epilog\n\
 125       \n\
 126       sw.epilog:\n\
 127         %a.0 = phi i32 [ 7, %entry ],  [ 9, %sw.bb1 ]\n\
 128         %b.0 = phi i32 [ 10, %entry ], [ 4, %sw.bb1 ]\n\
 129         ret i32 %a.0\n\
 130       }";
 131
 132   auto Mutator = createDeleterMutator();
 133   ASSERT_TRUE(Mutator);
 134
 135   IterateOnSource(Source, *Mutator);
 136 }
 137
 138 }