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 // 37 // Disable this check under MSVC; even MSVC 2015 isn't inconsistent between 38 // std::is_assignable and actually writing such an assignment. 39 #if !defined(_MSC_VER) 40 static_assert( 41 !std::is_assignable<ArrayRef<int *>, int *>::value, 42 "Assigning from single prvalue element"); 43 static_assert( 44 !std::is_assignable<ArrayRef<int *>, int * &&>::value, 45 "Assigning from single xvalue element"); 46 static_assert( 47 std::is_assignable<ArrayRef<int *>, int * &>::value, 48 "Assigning from single lvalue element"); 49 static_assert( 50 !std::is_assignable<ArrayRef<int *>, std::initializer_list<int *>>::value, 51 "Assigning from an initializer list"); 52 #endif 53 54 namespace { 55 56 TEST(ArrayRefTest, AllocatorCopy) { 57 BumpPtrAllocator Alloc; 58 static const uint16_t Words1[] = { 1, 4, 200, 37 }; 59 ArrayRef<uint16_t> Array1 = makeArrayRef(Words1, 4); 60 static const uint16_t Words2[] = { 11, 4003, 67, 64000, 13 }; 61 ArrayRef<uint16_t> Array2 = makeArrayRef(Words2, 5); 62 ArrayRef<uint16_t> Array1c = Array1.copy(Alloc); 63 ArrayRef<uint16_t> Array2c = Array2.copy(Alloc); 64 EXPECT_TRUE(Array1.equals(Array1c)); 65 EXPECT_NE(Array1.data(), Array1c.data()); 66 EXPECT_TRUE(Array2.equals(Array2c)); 67 EXPECT_NE(Array2.data(), Array2c.data()); 68 69 // Check that copy can cope with uninitialized memory. 70 struct NonAssignable { 71 const char *Ptr; 72 73 NonAssignable(const char *Ptr) : Ptr(Ptr) {} 74 NonAssignable(const NonAssignable &RHS) = default; 75 void operator=(const NonAssignable &RHS) { assert(RHS.Ptr != nullptr); } 76 bool operator==(const NonAssignable &RHS) const { return Ptr == RHS.Ptr; } 77 } Array3Src[] = {"hello", "world"}; 78 ArrayRef<NonAssignable> Array3Copy = makeArrayRef(Array3Src).copy(Alloc); 79 EXPECT_EQ(makeArrayRef(Array3Src), Array3Copy); 80 EXPECT_NE(makeArrayRef(Array3Src).data(), Array3Copy.data()); 81 } 82 83 TEST(ArrayRefTest, DropBack) { 84 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 85 ArrayRef<int> AR1(TheNumbers); 86 ArrayRef<int> AR2(TheNumbers, AR1.size() - 1); 87 EXPECT_TRUE(AR1.drop_back().equals(AR2)); 88 89 // Check that drop_back accepts size_t-sized numbers. 90 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000); 91 EXPECT_EQ(1U, AR3.drop_back(AR3.size() - 1).size()); 92 } 93 94 TEST(ArrayRefTest, DropFront) { 95 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 96 ArrayRef<int> AR1(TheNumbers); 97 ArrayRef<int> AR2(&TheNumbers[2], AR1.size() - 2); 98 EXPECT_TRUE(AR1.drop_front(2).equals(AR2)); 99 100 // Check that drop_front accepts size_t-sized numbers. 101 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000); 102 EXPECT_EQ(1U, AR3.drop_front(AR3.size() - 1).size()); 103 } 104 105 TEST(ArrayRefTest, TakeBack) { 106 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 107 ArrayRef<int> AR1(TheNumbers); 108 ArrayRef<int> AR2(AR1.end() - 1, 1); 109 EXPECT_TRUE(AR1.take_back().equals(AR2)); 110 } 111 112 TEST(ArrayRefTest, TakeFront) { 113 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42}; 114 ArrayRef<int> AR1(TheNumbers); 115 ArrayRef<int> AR2(AR1.data(), 2); 116 EXPECT_TRUE(AR1.take_front(2).equals(AR2)); 117 } 118 119 TEST(ArrayRefTest, Equals) { 120 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8}; 121 ArrayRef<int> AR1(A1); 122 EXPECT_TRUE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8})); 123 EXPECT_FALSE(AR1.equals({8, 1, 2, 4, 5, 6, 6, 7})); 124 EXPECT_FALSE(AR1.equals({2, 4, 5, 6, 6, 7, 8, 1})); 125 EXPECT_FALSE(AR1.equals({0, 1, 2, 4, 5, 6, 6, 7})); 126 EXPECT_FALSE(AR1.equals({1, 2, 42, 4, 5, 6, 7, 8})); 127 EXPECT_FALSE(AR1.equals({42, 2, 3, 4, 5, 6, 7, 8})); 128 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 42})); 129 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7})); 130 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8, 9})); 131 132 ArrayRef<int> AR1a = AR1.drop_back(); 133 EXPECT_TRUE(AR1a.equals({1, 2, 3, 4, 5, 6, 7})); 134 EXPECT_FALSE(AR1a.equals({1, 2, 3, 4, 5, 6, 7, 8})); 135 136 ArrayRef<int> AR1b = AR1a.slice(2, 4); 137 EXPECT_TRUE(AR1b.equals({3, 4, 5, 6})); 138 EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6})); 139 EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7})); 140 } 141 142 TEST(ArrayRefTest, EmptyEquals) { 143 EXPECT_TRUE(ArrayRef<unsigned>() == ArrayRef<unsigned>()); 144 } 145 146 TEST(ArrayRefTest, Slice) { 147 // Check that slice accepts size_t-sized numbers. 148 ArrayRef<char> AR((const char *)0x10000, SIZE_MAX - 0x10000); 149 EXPECT_EQ(1U, AR.slice(AR.size() - 1).size()); 150 EXPECT_EQ(AR.size() - 1, AR.slice(1, AR.size() - 1).size()); 151 } 152 153 TEST(ArrayRefTest, ConstConvert) { 154 int buf[4]; 155 for (int i = 0; i < 4; ++i) 156 buf[i] = i; 157 158 static int *A[] = {&buf[0], &buf[1], &buf[2], &buf[3]}; 159 ArrayRef<const int *> a((ArrayRef<int *>(A))); 160 a = ArrayRef<int *>(A); 161 } 162 163 static std::vector<int> ReturnTest12() { return {1, 2}; } 164 static void ArgTest12(ArrayRef<int> A) { 165 EXPECT_EQ(2U, A.size()); 166 EXPECT_EQ(1, A[0]); 167 EXPECT_EQ(2, A[1]); 168 } 169 170 TEST(ArrayRefTest, InitializerList) { 171 std::initializer_list<int> init_list = { 0, 1, 2, 3, 4 }; 172 ArrayRef<int> A = init_list; 173 for (int i = 0; i < 5; ++i) 174 EXPECT_EQ(i, A[i]); 175 176 std::vector<int> B = ReturnTest12(); 177 A = B; 178 EXPECT_EQ(1, A[0]); 179 EXPECT_EQ(2, A[1]); 180 181 ArgTest12({1, 2}); 182 } 183 184 TEST(ArrayRefTest, EmptyInitializerList) { 185 ArrayRef<int> A = {}; 186 EXPECT_TRUE(A.empty()); 187 188 A = {}; 189 EXPECT_TRUE(A.empty()); 190 } 191 192 // Test that makeArrayRef works on ArrayRef (no-op) 193 TEST(ArrayRefTest, makeArrayRef) { 194 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8}; 195 196 // No copy expected for non-const ArrayRef (true no-op) 197 ArrayRef<int> AR1(A1); 198 ArrayRef<int> &AR1Ref = makeArrayRef(AR1); 199 EXPECT_EQ(&AR1, &AR1Ref); 200 201 // A copy is expected for non-const ArrayRef (thin copy) 202 const ArrayRef<int> AR2(A1); 203 const ArrayRef<int> &AR2Ref = makeArrayRef(AR2); 204 EXPECT_NE(&AR2Ref, &AR2); 205 EXPECT_TRUE(AR2.equals(AR2Ref)); 206 } 207 208 } // end anonymous namespace 209