--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/unittests/FuzzMutate/RandomIRBuilderTest.cpp	Sat Feb 17 09:57:20 2018 +0900
@@ -0,0 +1,299 @@
+//===- RandomIRBuilderTest.cpp - Tests for injector strategy --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/FuzzMutate/RandomIRBuilder.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/AsmParser/SlotMapping.h"
+#include "llvm/FuzzMutate/IRMutator.h"
+#include "llvm/FuzzMutate/OpDescriptor.h"
+#include "llvm/FuzzMutate/Operations.h"
+#include "llvm/IR/Constants.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<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;
+}
+
+TEST(RandomIRBuilderTest, ShuffleVectorIncorrectOperands) {
+  // Test that we don't create load instruction as a source for the shuffle
+  // vector operation.
+
+  LLVMContext Ctx;
+  const char *Source =
+      "define <2 x i32> @test(<2 x i1> %cond, <2 x i32> %a) {\n"
+      "  %A = alloca <2 x i32>\n"
+      "  %I = insertelement <2 x i32> %a, i32 1, i32 1\n"
+      "  ret <2 x i32> undef\n"
+      "}";
+  auto M = parseAssembly(Source, Ctx);
+
+  fuzzerop::OpDescriptor Descr = fuzzerop::shuffleVectorDescriptor(1);
+
+  // Empty known types since we ShuffleVector descriptor doesn't care about them
+  RandomIRBuilder IB(Seed, {});
+
+  // Get first basic block of the first function
+  Function &F = *M->begin();
+  BasicBlock &BB = *F.begin();
+
+  SmallVector<Instruction *, 32> Insts;
+  for (auto I = BB.getFirstInsertionPt(), E = BB.end(); I != E; ++I)
+    Insts.push_back(&*I);
+
+  // Pick first and second sources
+  SmallVector<Value *, 2> Srcs;
+  ASSERT_TRUE(Descr.SourcePreds[0].matches(Srcs, Insts[1]));
+  Srcs.push_back(Insts[1]);
+  ASSERT_TRUE(Descr.SourcePreds[1].matches(Srcs, Insts[1]));
+  Srcs.push_back(Insts[1]);
+
+  // Create new source. Check that it always matches with the descriptor.
+  // Run some iterations to account for random decisions.
+  for (int i = 0; i < 10; ++i) {
+    Value *LastSrc = IB.newSource(BB, Insts, Srcs, Descr.SourcePreds[2]);
+    ASSERT_TRUE(Descr.SourcePreds[2].matches(Srcs, LastSrc));
+  }
+}
+
+TEST(RandomIRBuilderTest, InsertValueIndexes) {
+  // Check that we will generate correct indexes for the insertvalue operation
+
+  LLVMContext Ctx;
+  const char *Source =
+      "%T = type {i8, i32, i64}\n"
+      "define void @test() {\n"
+      "  %A = alloca %T\n"
+      "  %L = load %T, %T* %A"
+      "  ret void\n"
+      "}";
+  auto M = parseAssembly(Source, Ctx);
+
+  fuzzerop::OpDescriptor IVDescr = fuzzerop::insertValueDescriptor(1);
+
+  std::vector<Type *> Types =
+      {Type::getInt8Ty(Ctx), Type::getInt32Ty(Ctx), Type::getInt64Ty(Ctx)};
+  RandomIRBuilder IB(Seed, Types);
+
+  // Get first basic block of the first function
+  Function &F = *M->begin();
+  BasicBlock &BB = *F.begin();
+
+  // Pick first source
+  Instruction *Src = &*std::next(BB.begin());
+
+  SmallVector<Value *, 2> Srcs(2);
+  ASSERT_TRUE(IVDescr.SourcePreds[0].matches({}, Src));
+  Srcs[0] = Src;
+
+  // Generate constants for each of the types and check that we pick correct
+  // index for the given type
+  for (auto *T: Types) {
+    // Loop to account for possible random decisions
+    for (int i = 0; i < 10; ++i) {
+      // Create value we want to insert. Only it's type matters.
+      Srcs[1] = ConstantInt::get(T, 5);
+
+      // Try to pick correct index
+      Value *Src = IB.findOrCreateSource(
+          BB, &*BB.begin(), Srcs, IVDescr.SourcePreds[2]);
+      ASSERT_TRUE(IVDescr.SourcePreds[2].matches(Srcs, Src));
+    }
+  }
+}
+
+TEST(RandomIRBuilderTest, ShuffleVectorSink) {
+  // Check that we will never use shuffle vector mask as a sink form the
+  // unrelated operation.
+
+  LLVMContext Ctx;
+  const char *SourceCode =
+      "define void @test(<4 x i32> %a) {\n"
+      "  %S1 = shufflevector <4 x i32> %a, <4 x i32> %a, <4 x i32> undef\n"
+      "  %S2 = shufflevector <4 x i32> %a, <4 x i32> %a, <4 x i32> undef\n"
+      "  ret void\n"
+      "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+  fuzzerop::OpDescriptor IVDescr = fuzzerop::insertValueDescriptor(1);
+
+  RandomIRBuilder IB(Seed, {});
+
+  // Get first basic block of the first function
+  Function &F = *M->begin();
+  BasicBlock &BB = *F.begin();
+
+  // Source is %S1
+  Instruction *Source = &*BB.begin();
+  // Sink is %S2
+  SmallVector<Instruction *, 1> Sinks = {&*std::next(BB.begin())};
+
+  // Loop to account for random decisions
+  for (int i = 0; i < 10; ++i) {
+    // Try to connect S1 to S2. We should always create new sink.
+    IB.connectToSink(BB, Sinks, Source);
+    ASSERT_TRUE(!verifyModule(*M, &errs()));
+  }
+}
+
+TEST(RandomIRBuilderTest, InsertValueArray) {
+  // Check that we can generate insertvalue for the vector operations
+
+  LLVMContext Ctx;
+  const char *SourceCode =
+      "define void @test() {\n"
+      "  %A = alloca [8 x i32]\n"
+      "  %L = load [8 x i32], [8 x i32]* %A"
+      "  ret void\n"
+      "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+  fuzzerop::OpDescriptor Descr = fuzzerop::insertValueDescriptor(1);
+
+  std::vector<Type *> Types =
+      {Type::getInt8Ty(Ctx), Type::getInt32Ty(Ctx), Type::getInt64Ty(Ctx)};
+  RandomIRBuilder IB(Seed, Types);
+
+  // Get first basic block of the first function
+  Function &F = *M->begin();
+  BasicBlock &BB = *F.begin();
+
+  // Pick first source
+  Instruction *Source = &*std::next(BB.begin());
+  ASSERT_TRUE(Descr.SourcePreds[0].matches({}, Source));
+
+  SmallVector<Value *, 2> Srcs(2);
+
+  // Check that we can always pick the last two operands.
+  for (int i = 0; i < 10; ++i) {
+    Srcs[0] = Source;
+    Srcs[1] = IB.findOrCreateSource(BB, {Source}, Srcs, Descr.SourcePreds[1]);
+    IB.findOrCreateSource(BB, {}, Srcs, Descr.SourcePreds[2]);
+  }
+}
+
+TEST(RandomIRBuilderTest, Invokes) {
+  // Check that we never generate load or store after invoke instruction
+
+  LLVMContext Ctx;
+  const char *SourceCode =
+      "declare i32* @f()"
+      "declare i32 @personality_function()"
+      "define i32* @test() personality i32 ()* @personality_function {\n"
+      "entry:\n"
+      "  %val = invoke i32* @f()\n"
+      "          to label %normal unwind label %exceptional\n"
+      "normal:\n"
+      "  ret i32* %val\n"
+      "exceptional:\n"
+      "  %landing_pad4 = landingpad token cleanup\n"
+      "  ret i32* undef\n"
+      "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+
+  std::vector<Type *> Types = {Type::getInt8Ty(Ctx)};
+  RandomIRBuilder IB(Seed, Types);
+
+  // Get first basic block of the test function
+  Function &F = *M->getFunction("test");
+  BasicBlock &BB = *F.begin();
+
+  Instruction *Invoke = &*BB.begin();
+
+  // Find source but never insert new load after invoke
+  for (int i = 0; i < 10; ++i) {
+    (void)IB.findOrCreateSource(BB, {Invoke}, {}, fuzzerop::anyIntType());
+    ASSERT_TRUE(!verifyModule(*M, &errs()));
+  }
+}
+
+TEST(RandomIRBuilderTest, FirstClassTypes) {
+  // Check that we never insert new source as a load from non first class
+  // or unsized type.
+
+  LLVMContext Ctx;
+  const char *SourceCode = "%Opaque = type opaque\n"
+                           "define void @test(i8* %ptr) {\n"
+                           "entry:\n"
+                           "  %tmp = bitcast i8* %ptr to i32* (i32*)*\n"
+                           "  %tmp1 = bitcast i8* %ptr to %Opaque*\n"
+                           "  ret void\n"
+                           "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+  std::vector<Type *> Types = {Type::getInt8Ty(Ctx)};
+  RandomIRBuilder IB(Seed, Types);
+
+  Function &F = *M->getFunction("test");
+  BasicBlock &BB = *F.begin();
+  // Non first class type
+  Instruction *FuncPtr = &*BB.begin();
+  // Unsized type
+  Instruction *OpaquePtr = &*std::next(BB.begin());
+
+  for (int i = 0; i < 10; ++i) {
+    Value *V = IB.findOrCreateSource(BB, {FuncPtr, OpaquePtr});
+    ASSERT_FALSE(isa<LoadInst>(V));
+  }
+}
+
+TEST(RandomIRBuilderTest, SwiftError) {
+  // Check that we never pick swifterror value as a source for operation
+  // other than load, store and call.
+
+  LLVMContext Ctx;
+  const char *SourceCode = "declare void @use(i8** swifterror %err)"
+                           "define void @test() {\n"
+                           "entry:\n"
+                           "  %err = alloca swifterror i8*, align 8\n"
+                           "  call void @use(i8** swifterror %err)\n"
+                           "  ret void\n"
+                           "}";
+  auto M = parseAssembly(SourceCode, Ctx);
+
+  std::vector<Type *> Types = {Type::getInt8Ty(Ctx)};
+  RandomIRBuilder IB(Seed, Types);
+
+  // Get first basic block of the test function
+  Function &F = *M->getFunction("test");
+  BasicBlock &BB = *F.begin();
+  Instruction *Alloca = &*BB.begin();
+
+  fuzzerop::OpDescriptor Descr = fuzzerop::gepDescriptor(1);
+
+  for (int i = 0; i < 10; ++i) {
+    Value *V = IB.findOrCreateSource(BB, {Alloca}, {}, Descr.SourcePreds[0]);
+    ASSERT_FALSE(isa<AllocaInst>(V));
+  }
+}
+
+}