1 //===- llvm/unittest/ADT/ArrayRefTest.cpp - ArrayRef 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/ADT/ArrayRef.h" 11 #include "llvm/Support/Allocator.h" 12 #include "llvm/Support/raw_ostream.h" 13 #include "gtest/gtest.h" 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 TEST(ArrayRefTest, DropBack) { 79 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 80 ArrayRef<int> AR1(TheNumbers); 81 ArrayRef<int> AR2(TheNumbers, AR1.size() - 1); 82 EXPECT_TRUE(AR1.drop_back().equals(AR2)); 83 84 // Check that drop_back accepts size_t-sized numbers. 85 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000); 86 EXPECT_EQ(1U, AR3.drop_back(AR3.size() - 1).size()); 87 } 88 89 TEST(ArrayRefTest, DropFront) { 90 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 91 ArrayRef<int> AR1(TheNumbers); 92 ArrayRef<int> AR2(&TheNumbers[2], AR1.size() - 2); 93 EXPECT_TRUE(AR1.drop_front(2).equals(AR2)); 94 95 // Check that drop_front accepts size_t-sized numbers. 96 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000); 97 EXPECT_EQ(1U, AR3.drop_front(AR3.size() - 1).size()); 98 } 99 100 TEST(ArrayRefTest, TakeBack) { 101 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 102 ArrayRef<int> AR1(TheNumbers); 103 ArrayRef<int> AR2(AR1.end() - 1, 1); 104 EXPECT_TRUE(AR1.take_back().equals(AR2)); 105 } 106 107 TEST(ArrayRefTest, TakeFront) { 108 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 109 ArrayRef<int> AR1(TheNumbers); 110 ArrayRef<int> AR2(AR1.data(), 2); 111 EXPECT_TRUE(AR1.take_front(2).equals(AR2)); 112 } 113 114 TEST(ArrayRefTest, Equals) { 115 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8}; 116 ArrayRef<int> AR1(A1); 117 EXPECT_TRUE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8})); 118 EXPECT_FALSE(AR1.equals({8, 1, 2, 4, 5, 6, 6, 7})); 119 EXPECT_FALSE(AR1.equals({2, 4, 5, 6, 6, 7, 8, 1})); 120 EXPECT_FALSE(AR1.equals({0, 1, 2, 4, 5, 6, 6, 7})); 121 EXPECT_FALSE(AR1.equals({1, 2, 42, 4, 5, 6, 7, 8})); 122 EXPECT_FALSE(AR1.equals({42, 2, 3, 4, 5, 6, 7, 8})); 123 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 42})); 124 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7})); 125 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8, 9})); 126 127 ArrayRef<int> AR1a = AR1.drop_back(); 128 EXPECT_TRUE(AR1a.equals({1, 2, 3, 4, 5, 6, 7})); 129 EXPECT_FALSE(AR1a.equals({1, 2, 3, 4, 5, 6, 7, 8})); 130 131 ArrayRef<int> AR1b = AR1a.slice(2, 4); 132 EXPECT_TRUE(AR1b.equals({3, 4, 5, 6})); 133 EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6})); 134 EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7})); 135 } 136 137 TEST(ArrayRefTest, EmptyEquals) { 138 EXPECT_TRUE(ArrayRef<unsigned>() == ArrayRef<unsigned>()); 139 } 140 141 TEST(ArrayRefTest, Slice) { 142 // Check that slice accepts size_t-sized numbers. 143 ArrayRef<char> AR((const char *)0x10000, SIZE_MAX - 0x10000); 144 EXPECT_EQ(1U, AR.slice(AR.size() - 1).size()); 145 EXPECT_EQ(AR.size() - 1, AR.slice(1, AR.size() - 1).size()); 146 } 147 148 TEST(ArrayRefTest, ConstConvert) { 149 int buf[4]; 150 for (int i = 0; i < 4; ++i) 151 buf[i] = i; 152 153 static int *A[] = {&buf[0], &buf[1], &buf[2], &buf[3]}; 154 ArrayRef<const int *> a((ArrayRef<int *>(A))); 155 a = ArrayRef<int *>(A); 156 } 157 158 static std::vector<int> ReturnTest12() { return {1, 2}; } 159 static void ArgTest12(ArrayRef<int> A) { 160 EXPECT_EQ(2U, A.size()); 161 EXPECT_EQ(1, A[0]); 162 EXPECT_EQ(2, A[1]); 163 } 164 165 TEST(ArrayRefTest, InitializerList) { 166 std::initializer_list<int> init_list = { 0, 1, 2, 3, 4 }; 167 ArrayRef<int> A = init_list; 168 for (int i = 0; i < 5; ++i) 169 EXPECT_EQ(i, A[i]); 170 171 std::vector<int> B = ReturnTest12(); 172 A = B; 173 EXPECT_EQ(1, A[0]); 174 EXPECT_EQ(2, A[1]); 175 176 ArgTest12({1, 2}); 177 } 178 179 TEST(ArrayRefTest, EmptyInitializerList) { 180 ArrayRef<int> A = {}; 181 EXPECT_TRUE(A.empty()); 182 183 A = {}; 184 EXPECT_TRUE(A.empty()); 185 } 186 187 // Test that makeArrayRef works on ArrayRef (no-op) 188 TEST(ArrayRefTest, makeArrayRef) { 189 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8}; 190 191 // No copy expected for non-const ArrayRef (true no-op) 192 ArrayRef<int> AR1(A1); 193 ArrayRef<int> &AR1Ref = makeArrayRef(AR1); 194 EXPECT_EQ(&AR1, &AR1Ref); 195 196 // A copy is expected for non-const ArrayRef (thin copy) 197 const ArrayRef<int> AR2(A1); 198 const ArrayRef<int> &AR2Ref = makeArrayRef(AR2); 199 EXPECT_NE(&AR2Ref, &AR2); 200 EXPECT_TRUE(AR2.equals(AR2Ref)); 201 } 202 203 } // end anonymous namespace 204