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 namespace {
35
TEST(ArrayRefTest,AllocatorCopy)36 TEST(ArrayRefTest, AllocatorCopy) {
37 BumpPtrAllocator Alloc;
38 static const uint16_t Words1[] = { 1, 4, 200, 37 };
39 ArrayRef<uint16_t> Array1 = makeArrayRef(Words1, 4);
40 static const uint16_t Words2[] = { 11, 4003, 67, 64000, 13 };
41 ArrayRef<uint16_t> Array2 = makeArrayRef(Words2, 5);
42 ArrayRef<uint16_t> Array1c = Array1.copy(Alloc);
43 ArrayRef<uint16_t> Array2c = Array2.copy(Alloc);
44 EXPECT_TRUE(Array1.equals(Array1c));
45 EXPECT_NE(Array1.data(), Array1c.data());
46 EXPECT_TRUE(Array2.equals(Array2c));
47 EXPECT_NE(Array2.data(), Array2c.data());
48
49 // Check that copy can cope with uninitialized memory.
50 struct NonAssignable {
51 const char *Ptr;
52
53 NonAssignable(const char *Ptr) : Ptr(Ptr) {}
54 NonAssignable(const NonAssignable &RHS) = default;
55 void operator=(const NonAssignable &RHS) { assert(RHS.Ptr != nullptr); }
56 bool operator==(const NonAssignable &RHS) const { return Ptr == RHS.Ptr; }
57 } Array3Src[] = {"hello", "world"};
58 ArrayRef<NonAssignable> Array3Copy = makeArrayRef(Array3Src).copy(Alloc);
59 EXPECT_EQ(makeArrayRef(Array3Src), Array3Copy);
60 EXPECT_NE(makeArrayRef(Array3Src).data(), Array3Copy.data());
61 }
62
TEST(ArrayRefTest,DropBack)63 TEST(ArrayRefTest, DropBack) {
64 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
65 ArrayRef<int> AR1(TheNumbers);
66 ArrayRef<int> AR2(TheNumbers, AR1.size() - 1);
67 EXPECT_TRUE(AR1.drop_back().equals(AR2));
68
69 // Check that drop_back accepts size_t-sized numbers.
70 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000);
71 EXPECT_EQ(1U, AR3.drop_back(AR3.size() - 1).size());
72 }
73
TEST(ArrayRefTest,DropFront)74 TEST(ArrayRefTest, DropFront) {
75 static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
76 ArrayRef<int> AR1(TheNumbers);
77 ArrayRef<int> AR2(&TheNumbers[2], AR1.size() - 2);
78 EXPECT_TRUE(AR1.drop_front(2).equals(AR2));
79
80 // Check that drop_front accepts size_t-sized numbers.
81 ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000);
82 EXPECT_EQ(1U, AR3.drop_front(AR3.size() - 1).size());
83 }
84
TEST(ArrayRefTest,Equals)85 TEST(ArrayRefTest, Equals) {
86 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
87 ArrayRef<int> AR1(A1);
88 EXPECT_TRUE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8}));
89 EXPECT_FALSE(AR1.equals({8, 1, 2, 4, 5, 6, 6, 7}));
90 EXPECT_FALSE(AR1.equals({2, 4, 5, 6, 6, 7, 8, 1}));
91 EXPECT_FALSE(AR1.equals({0, 1, 2, 4, 5, 6, 6, 7}));
92 EXPECT_FALSE(AR1.equals({1, 2, 42, 4, 5, 6, 7, 8}));
93 EXPECT_FALSE(AR1.equals({42, 2, 3, 4, 5, 6, 7, 8}));
94 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 42}));
95 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7}));
96 EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8, 9}));
97
98 ArrayRef<int> AR1a = AR1.drop_back();
99 EXPECT_TRUE(AR1a.equals({1, 2, 3, 4, 5, 6, 7}));
100 EXPECT_FALSE(AR1a.equals({1, 2, 3, 4, 5, 6, 7, 8}));
101
102 ArrayRef<int> AR1b = AR1a.slice(2, 4);
103 EXPECT_TRUE(AR1b.equals({3, 4, 5, 6}));
104 EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6}));
105 EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7}));
106 }
107
TEST(ArrayRefTest,EmptyEquals)108 TEST(ArrayRefTest, EmptyEquals) {
109 EXPECT_TRUE(ArrayRef<unsigned>() == ArrayRef<unsigned>());
110 }
111
TEST(ArrayRefTest,Slice)112 TEST(ArrayRefTest, Slice) {
113 // Check that slice accepts size_t-sized numbers.
114 ArrayRef<char> AR((const char *)0x10000, SIZE_MAX - 0x10000);
115 EXPECT_EQ(1U, AR.slice(AR.size() - 1).size());
116 EXPECT_EQ(AR.size() - 1, AR.slice(1, AR.size() - 1).size());
117 }
118
TEST(ArrayRefTest,ConstConvert)119 TEST(ArrayRefTest, ConstConvert) {
120 int buf[4];
121 for (int i = 0; i < 4; ++i)
122 buf[i] = i;
123
124 static int *A[] = {&buf[0], &buf[1], &buf[2], &buf[3]};
125 ArrayRef<const int *> a((ArrayRef<int *>(A)));
126 a = ArrayRef<int *>(A);
127 }
128
ReturnTest12()129 static std::vector<int> ReturnTest12() { return {1, 2}; }
ArgTest12(ArrayRef<int> A)130 static void ArgTest12(ArrayRef<int> A) {
131 EXPECT_EQ(2U, A.size());
132 EXPECT_EQ(1, A[0]);
133 EXPECT_EQ(2, A[1]);
134 }
135
TEST(ArrayRefTest,InitializerList)136 TEST(ArrayRefTest, InitializerList) {
137 ArrayRef<int> A = { 0, 1, 2, 3, 4 };
138 for (int i = 0; i < 5; ++i)
139 EXPECT_EQ(i, A[i]);
140
141 std::vector<int> B = ReturnTest12();
142 A = B;
143 EXPECT_EQ(1, A[0]);
144 EXPECT_EQ(2, A[1]);
145
146 ArgTest12({1, 2});
147 }
148
149 // Test that makeArrayRef works on ArrayRef (no-op)
TEST(ArrayRefTest,makeArrayRef)150 TEST(ArrayRefTest, makeArrayRef) {
151 static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
152
153 // No copy expected for non-const ArrayRef (true no-op)
154 ArrayRef<int> AR1(A1);
155 ArrayRef<int> &AR1Ref = makeArrayRef(AR1);
156 EXPECT_EQ(&AR1, &AR1Ref);
157
158 // A copy is expected for non-const ArrayRef (thin copy)
159 const ArrayRef<int> AR2(A1);
160 const ArrayRef<int> &AR2Ref = makeArrayRef(AR2);
161 EXPECT_NE(&AR2Ref, &AR2);
162 EXPECT_TRUE(AR2.equals(AR2Ref));
163 }
164
165 } // end anonymous namespace
166