unittests/ADT/ArrayRefTest.cpp

   1 //===- llvm/unittest/ADT/ArrayRefTest.cpp - ArrayRef unit tests -----------===//
   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/ArrayRef.h"
  10 #include "llvm/Support/Allocator.h"
  11 #include "llvm/Support/raw_ostream.h"
  12 #include "gtest/gtest.h"
  13 #include <limits>
  14 #include <vector>
  15 using namespace llvm;
  16
  17 // Check that the ArrayRef-of-pointer converting constructor only allows adding
  18 // cv qualifiers (not removing them, or otherwise changing the type)
  19 static_assert(
  20     std::is_convertible<ArrayRef<int *>, ArrayRef<const int *>>::value,
  21     "Adding const");
  22 static_assert(
  23     std::is_convertible<ArrayRef<int *>, ArrayRef<volatile int *>>::value,
  24     "Adding volatile");
  25 static_assert(!std::is_convertible<ArrayRef<int *>, ArrayRef<float *>>::value,
  26               "Changing pointer of one type to a pointer of another");
  27 static_assert(
  28     !std::is_convertible<ArrayRef<const int *>, ArrayRef<int *>>::value,
  29     "Removing const");
  30 static_assert(
  31     !std::is_convertible<ArrayRef<volatile int *>, ArrayRef<int *>>::value,
  32     "Removing volatile");
  33
  34 // Check that we can't accidentally assign a temporary location to an ArrayRef.
  35 // (Unfortunately we can't make use of the same thing with constructors.)
  36 static_assert(
  37     !std::is_assignable<ArrayRef<int *>&, int *>::value,
  38     "Assigning from single prvalue element");
  39 static_assert(
  40     !std::is_assignable<ArrayRef<int *>&, int * &&>::value,
  41     "Assigning from single xvalue element");
  42 static_assert(
  43     std::is_assignable<ArrayRef<int *>&, int * &>::value,
  44     "Assigning from single lvalue element");
  45 static_assert(
  46     !std::is_assignable<ArrayRef<int *>&, std::initializer_list<int *>>::value,
  47     "Assigning from an initializer list");
  48
  49 namespace {
  50
  51 TEST(ArrayRefTest, AllocatorCopy) {
  52   BumpPtrAllocator Alloc;
  53   static const uint16_t Words1[] = { 1, 4, 200, 37 };
  54   ArrayRef<uint16_t> Array1 = makeArrayRef(Words1, 4);
  55   static const uint16_t Words2[] = { 11, 4003, 67, 64000, 13 };
  56   ArrayRef<uint16_t> Array2 = makeArrayRef(Words2, 5);
  57   ArrayRef<uint16_t> Array1c = Array1.copy(Alloc);
  58   ArrayRef<uint16_t> Array2c = Array2.copy(Alloc);
  59   EXPECT_TRUE(Array1.equals(Array1c));
  60   EXPECT_NE(Array1.data(), Array1c.data());
  61   EXPECT_TRUE(Array2.equals(Array2c));
  62   EXPECT_NE(Array2.data(), Array2c.data());
  63
  64   // Check that copy can cope with uninitialized memory.
  65   struct NonAssignable {
  66     const char *Ptr;
  67
  68     NonAssignable(const char *Ptr) : Ptr(Ptr) {}
  69     NonAssignable(const NonAssignable &RHS) = default;
  70     void operator=(const NonAssignable &RHS) { assert(RHS.Ptr != nullptr); }
  71     bool operator==(const NonAssignable &RHS) const { return Ptr == RHS.Ptr; }
  72   } Array3Src[] = {"hello", "world"};
  73   ArrayRef<NonAssignable> Array3Copy = makeArrayRef(Array3Src).copy(Alloc);
  74   EXPECT_EQ(makeArrayRef(Array3Src), Array3Copy);
  75   EXPECT_NE(makeArrayRef(Array3Src).data(), Array3Copy.data());
  76 }
  77
  78 // This test is pure UB given the ArrayRef<> implementation.
  79 // You are not allowed to produce non-null pointers given null base pointer.
  80 TEST(ArrayRefTest, DISABLED_SizeTSizedOperations) {
  81   ArrayRef<char> AR(nullptr, std::numeric_limits<ptrdiff_t>::max());
  82
  83   // Check that drop_back accepts size_t-sized numbers.
  84   EXPECT_EQ(1U, AR.drop_back(AR.size() - 1).size());
  85
  86   // Check that drop_front accepts size_t-sized numbers.
  87   EXPECT_EQ(1U, AR.drop_front(AR.size() - 1).size());
  88
  89   // Check that slice accepts size_t-sized numbers.
  90   EXPECT_EQ(1U, AR.slice(AR.size() - 1).size());
  91   EXPECT_EQ(AR.size() - 1, AR.slice(1, AR.size() - 1).size());
  92 }
  93
  94 TEST(ArrayRefTest, DropBack) {
  95   static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
  96   ArrayRef<int> AR1(TheNumbers);
  97   ArrayRef<int> AR2(TheNumbers, AR1.size() - 1);
  98   EXPECT_TRUE(AR1.drop_back().equals(AR2));
  99 }
 100
 101 TEST(ArrayRefTest, DropFront) {
 102   static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
 103   ArrayRef<int> AR1(TheNumbers);
 104   ArrayRef<int> AR2(&TheNumbers[2], AR1.size() - 2);
 105   EXPECT_TRUE(AR1.drop_front(2).equals(AR2));
 106 }
 107
 108 TEST(ArrayRefTest, DropWhile) {
 109   static const int TheNumbers[] = {1, 3, 5, 8, 10, 11};
 110   ArrayRef<int> AR1(TheNumbers);
 111   ArrayRef<int> Expected = AR1.drop_front(3);
 112   EXPECT_EQ(Expected, AR1.drop_while([](const int &N) { return N % 2 == 1; }));
 113
 114   EXPECT_EQ(AR1, AR1.drop_while([](const int &N) { return N < 0; }));
 115   EXPECT_EQ(ArrayRef<int>(),
 116             AR1.drop_while([](const int &N) { return N > 0; }));
 117 }
 118
 119 TEST(ArrayRefTest, DropUntil) {
 120   static const int TheNumbers[] = {1, 3, 5, 8, 10, 11};
 121   ArrayRef<int> AR1(TheNumbers);
 122   ArrayRef<int> Expected = AR1.drop_front(3);
 123   EXPECT_EQ(Expected, AR1.drop_until([](const int &N) { return N % 2 == 0; }));
 124
 125   EXPECT_EQ(ArrayRef<int>(),
 126             AR1.drop_until([](const int &N) { return N < 0; }));
 127   EXPECT_EQ(AR1, AR1.drop_until([](const int &N) { return N > 0; }));
 128 }
 129
 130 TEST(ArrayRefTest, TakeBack) {
 131   static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
 132   ArrayRef<int> AR1(TheNumbers);
 133   ArrayRef<int> AR2(AR1.end() - 1, 1);
 134   EXPECT_TRUE(AR1.take_back().equals(AR2));
 135 }
 136
 137 TEST(ArrayRefTest, TakeFront) {
 138   static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
 139   ArrayRef<int> AR1(TheNumbers);
 140   ArrayRef<int> AR2(AR1.data(), 2);
 141   EXPECT_TRUE(AR1.take_front(2).equals(AR2));
 142 }
 143
 144 TEST(ArrayRefTest, TakeWhile) {
 145   static const int TheNumbers[] = {1, 3, 5, 8, 10, 11};
 146   ArrayRef<int> AR1(TheNumbers);
 147   ArrayRef<int> Expected = AR1.take_front(3);
 148   EXPECT_EQ(Expected, AR1.take_while([](const int &N) { return N % 2 == 1; }));
 149
 150   EXPECT_EQ(ArrayRef<int>(),
 151             AR1.take_while([](const int &N) { return N < 0; }));
 152   EXPECT_EQ(AR1, AR1.take_while([](const int &N) { return N > 0; }));
 153 }
 154
 155 TEST(ArrayRefTest, TakeUntil) {
 156   static const int TheNumbers[] = {1, 3, 5, 8, 10, 11};
 157   ArrayRef<int> AR1(TheNumbers);
 158   ArrayRef<int> Expected = AR1.take_front(3);
 159   EXPECT_EQ(Expected, AR1.take_until([](const int &N) { return N % 2 == 0; }));
 160
 161   EXPECT_EQ(AR1, AR1.take_until([](const int &N) { return N < 0; }));
 162   EXPECT_EQ(ArrayRef<int>(),
 163             AR1.take_until([](const int &N) { return N > 0; }));
 164 }
 165
 166 TEST(ArrayRefTest, Equals) {
 167   static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
 168   ArrayRef<int> AR1(A1);
 169   EXPECT_TRUE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8}));
 170   EXPECT_FALSE(AR1.equals({8, 1, 2, 4, 5, 6, 6, 7}));
 171   EXPECT_FALSE(AR1.equals({2, 4, 5, 6, 6, 7, 8, 1}));
 172   EXPECT_FALSE(AR1.equals({0, 1, 2, 4, 5, 6, 6, 7}));
 173   EXPECT_FALSE(AR1.equals({1, 2, 42, 4, 5, 6, 7, 8}));
 174   EXPECT_FALSE(AR1.equals({42, 2, 3, 4, 5, 6, 7, 8}));
 175   EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 42}));
 176   EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7}));
 177   EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8, 9}));
 178
 179   ArrayRef<int> AR1a = AR1.drop_back();
 180   EXPECT_TRUE(AR1a.equals({1, 2, 3, 4, 5, 6, 7}));
 181   EXPECT_FALSE(AR1a.equals({1, 2, 3, 4, 5, 6, 7, 8}));
 182
 183   ArrayRef<int> AR1b = AR1a.slice(2, 4);
 184   EXPECT_TRUE(AR1b.equals({3, 4, 5, 6}));
 185   EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6}));
 186   EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7}));
 187 }
 188
 189 TEST(ArrayRefTest, EmptyEquals) {
 190   EXPECT_TRUE(ArrayRef<unsigned>() == ArrayRef<unsigned>());
 191 }
 192
 193 TEST(ArrayRefTest, ConstConvert) {
 194   int buf[4];
 195   for (int i = 0; i < 4; ++i)
 196     buf[i] = i;
 197
 198   static int *A[] = {&buf[0], &buf[1], &buf[2], &buf[3]};
 199   ArrayRef<const int *> a((ArrayRef<int *>(A)));
 200   a = ArrayRef<int *>(A);
 201 }
 202
 203 static std::vector<int> ReturnTest12() { return {1, 2}; }
 204 static void ArgTest12(ArrayRef<int> A) {
 205   EXPECT_EQ(2U, A.size());
 206   EXPECT_EQ(1, A[0]);
 207   EXPECT_EQ(2, A[1]);
 208 }
 209
 210 TEST(ArrayRefTest, InitializerList) {
 211   std::initializer_list<int> init_list = { 0, 1, 2, 3, 4 };
 212   ArrayRef<int> A = init_list;
 213   for (int i = 0; i < 5; ++i)
 214     EXPECT_EQ(i, A[i]);
 215
 216   std::vector<int> B = ReturnTest12();
 217   A = B;
 218   EXPECT_EQ(1, A[0]);
 219   EXPECT_EQ(2, A[1]);
 220
 221   ArgTest12({1, 2});
 222 }
 223
 224 TEST(ArrayRefTest, EmptyInitializerList) {
 225   ArrayRef<int> A = {};
 226   EXPECT_TRUE(A.empty());
 227
 228   A = {};
 229   EXPECT_TRUE(A.empty());
 230 }
 231
 232 // Test that makeArrayRef works on ArrayRef (no-op)
 233 TEST(ArrayRefTest, makeArrayRef) {
 234   static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
 235
 236   // No copy expected for non-const ArrayRef (true no-op)
 237   ArrayRef<int> AR1(A1);
 238   ArrayRef<int> &AR1Ref = makeArrayRef(AR1);
 239   EXPECT_EQ(&AR1, &AR1Ref);
 240
 241   // A copy is expected for non-const ArrayRef (thin copy)
 242   const ArrayRef<int> AR2(A1);
 243   const ArrayRef<int> &AR2Ref = makeArrayRef(AR2);
 244   EXPECT_NE(&AR2Ref, &AR2);
 245   EXPECT_TRUE(AR2.equals(AR2Ref));
 246 }
 247
 248 TEST(ArrayRefTest, OwningArrayRef) {
 249   static const int A1[] = {0, 1};
 250   OwningArrayRef<int> A(makeArrayRef(A1));
 251   OwningArrayRef<int> B(std::move(A));
 252   EXPECT_EQ(A.data(), nullptr);
 253 }
 254
 255 TEST(ArrayRefTest, makeArrayRefFromStdArray) {
 256   std::array<int, 5> A1{{42, -5, 0, 1000000, -1000000}};
 257   ArrayRef<int> A2 = makeArrayRef(A1);
 258
 259   EXPECT_EQ(A1.size(), A2.size());
 260   for (std::size_t i = 0; i < A1.size(); ++i) {
 261     EXPECT_EQ(A1[i], A2[i]);
 262   }
 263 }
 264
 265 static_assert(is_trivially_copyable<ArrayRef<int>>::value,
 266               "trivially copyable");
 267
 268 } // end anonymous namespace