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31b90a7187
Without this, the following statements will create ArrayRefs that
refer to temporary storage that goes out of scope by the end of the
line:
someArrayRef = getSingleElement();
someArrayRef = {elem1, elem2};
Note that the constructor still has this problem:
ArrayRef<Element> someArrayRef = getSingleElement();
ArrayRef<Element> someArrayRef = {elem1, elem2};
but that's a little harder to get rid of because we want to be able to
use this in calls:
takesArrayRef(getSingleElement());
takesArrayRef({elem1, elem2});
Part of rdar://problem/16375365. Reviewed by Duncan Exon Smith.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283798 91177308-0d34-0410-b5e6-96231b3b80d8
204 lines
6.8 KiB
C++
204 lines
6.8 KiB
C++
//===- llvm/unittest/ADT/ArrayRefTest.cpp - ArrayRef unit tests -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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#include <vector>
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using namespace llvm;
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// Check that the ArrayRef-of-pointer converting constructor only allows adding
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// cv qualifiers (not removing them, or otherwise changing the type)
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static_assert(
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std::is_convertible<ArrayRef<int *>, ArrayRef<const int *>>::value,
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"Adding const");
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static_assert(
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std::is_convertible<ArrayRef<int *>, ArrayRef<volatile int *>>::value,
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"Adding volatile");
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static_assert(!std::is_convertible<ArrayRef<int *>, ArrayRef<float *>>::value,
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"Changing pointer of one type to a pointer of another");
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static_assert(
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!std::is_convertible<ArrayRef<const int *>, ArrayRef<int *>>::value,
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"Removing const");
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static_assert(
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!std::is_convertible<ArrayRef<volatile int *>, ArrayRef<int *>>::value,
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"Removing volatile");
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// Check that we can't accidentally assign a temporary location to an ArrayRef.
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// (Unfortunately we can't make use of the same thing with constructors.)
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static_assert(
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!std::is_assignable<ArrayRef<int *>, int *>::value,
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"Assigning from single prvalue element");
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static_assert(
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!std::is_assignable<ArrayRef<int *>, int * &&>::value,
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"Assigning from single xvalue element");
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static_assert(
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std::is_assignable<ArrayRef<int *>, int * &>::value,
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"Assigning from single lvalue element");
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static_assert(
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!std::is_assignable<ArrayRef<int *>, std::initializer_list<int *>>::value,
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"Assigning from an initializer list");
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namespace {
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TEST(ArrayRefTest, AllocatorCopy) {
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BumpPtrAllocator Alloc;
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static const uint16_t Words1[] = { 1, 4, 200, 37 };
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ArrayRef<uint16_t> Array1 = makeArrayRef(Words1, 4);
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static const uint16_t Words2[] = { 11, 4003, 67, 64000, 13 };
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ArrayRef<uint16_t> Array2 = makeArrayRef(Words2, 5);
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ArrayRef<uint16_t> Array1c = Array1.copy(Alloc);
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ArrayRef<uint16_t> Array2c = Array2.copy(Alloc);
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EXPECT_TRUE(Array1.equals(Array1c));
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EXPECT_NE(Array1.data(), Array1c.data());
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EXPECT_TRUE(Array2.equals(Array2c));
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EXPECT_NE(Array2.data(), Array2c.data());
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// Check that copy can cope with uninitialized memory.
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struct NonAssignable {
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const char *Ptr;
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NonAssignable(const char *Ptr) : Ptr(Ptr) {}
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NonAssignable(const NonAssignable &RHS) = default;
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void operator=(const NonAssignable &RHS) { assert(RHS.Ptr != nullptr); }
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bool operator==(const NonAssignable &RHS) const { return Ptr == RHS.Ptr; }
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} Array3Src[] = {"hello", "world"};
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ArrayRef<NonAssignable> Array3Copy = makeArrayRef(Array3Src).copy(Alloc);
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EXPECT_EQ(makeArrayRef(Array3Src), Array3Copy);
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EXPECT_NE(makeArrayRef(Array3Src).data(), Array3Copy.data());
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}
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TEST(ArrayRefTest, DropBack) {
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static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
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ArrayRef<int> AR1(TheNumbers);
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ArrayRef<int> AR2(TheNumbers, AR1.size() - 1);
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EXPECT_TRUE(AR1.drop_back().equals(AR2));
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// Check that drop_back accepts size_t-sized numbers.
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ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000);
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EXPECT_EQ(1U, AR3.drop_back(AR3.size() - 1).size());
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}
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TEST(ArrayRefTest, DropFront) {
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static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
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ArrayRef<int> AR1(TheNumbers);
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ArrayRef<int> AR2(&TheNumbers[2], AR1.size() - 2);
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EXPECT_TRUE(AR1.drop_front(2).equals(AR2));
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// Check that drop_front accepts size_t-sized numbers.
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ArrayRef<char> AR3((const char *)0x10000, SIZE_MAX - 0x10000);
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EXPECT_EQ(1U, AR3.drop_front(AR3.size() - 1).size());
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}
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TEST(ArrayRefTest, TakeBack) {
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static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
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ArrayRef<int> AR1(TheNumbers);
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ArrayRef<int> AR2(AR1.end() - 1, 1);
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EXPECT_TRUE(AR1.take_back().equals(AR2));
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}
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TEST(ArrayRefTest, TakeFront) {
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static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
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ArrayRef<int> AR1(TheNumbers);
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ArrayRef<int> AR2(AR1.data(), 2);
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EXPECT_TRUE(AR1.take_front(2).equals(AR2));
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}
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TEST(ArrayRefTest, Equals) {
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static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
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ArrayRef<int> AR1(A1);
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EXPECT_TRUE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8}));
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EXPECT_FALSE(AR1.equals({8, 1, 2, 4, 5, 6, 6, 7}));
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EXPECT_FALSE(AR1.equals({2, 4, 5, 6, 6, 7, 8, 1}));
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EXPECT_FALSE(AR1.equals({0, 1, 2, 4, 5, 6, 6, 7}));
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EXPECT_FALSE(AR1.equals({1, 2, 42, 4, 5, 6, 7, 8}));
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EXPECT_FALSE(AR1.equals({42, 2, 3, 4, 5, 6, 7, 8}));
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EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 42}));
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EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7}));
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EXPECT_FALSE(AR1.equals({1, 2, 3, 4, 5, 6, 7, 8, 9}));
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ArrayRef<int> AR1a = AR1.drop_back();
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EXPECT_TRUE(AR1a.equals({1, 2, 3, 4, 5, 6, 7}));
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EXPECT_FALSE(AR1a.equals({1, 2, 3, 4, 5, 6, 7, 8}));
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ArrayRef<int> AR1b = AR1a.slice(2, 4);
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EXPECT_TRUE(AR1b.equals({3, 4, 5, 6}));
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EXPECT_FALSE(AR1b.equals({2, 3, 4, 5, 6}));
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EXPECT_FALSE(AR1b.equals({3, 4, 5, 6, 7}));
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}
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TEST(ArrayRefTest, EmptyEquals) {
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EXPECT_TRUE(ArrayRef<unsigned>() == ArrayRef<unsigned>());
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}
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TEST(ArrayRefTest, Slice) {
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// Check that slice accepts size_t-sized numbers.
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ArrayRef<char> AR((const char *)0x10000, SIZE_MAX - 0x10000);
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EXPECT_EQ(1U, AR.slice(AR.size() - 1).size());
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EXPECT_EQ(AR.size() - 1, AR.slice(1, AR.size() - 1).size());
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}
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TEST(ArrayRefTest, ConstConvert) {
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int buf[4];
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for (int i = 0; i < 4; ++i)
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buf[i] = i;
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static int *A[] = {&buf[0], &buf[1], &buf[2], &buf[3]};
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ArrayRef<const int *> a((ArrayRef<int *>(A)));
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a = ArrayRef<int *>(A);
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}
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static std::vector<int> ReturnTest12() { return {1, 2}; }
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static void ArgTest12(ArrayRef<int> A) {
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EXPECT_EQ(2U, A.size());
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EXPECT_EQ(1, A[0]);
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EXPECT_EQ(2, A[1]);
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}
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TEST(ArrayRefTest, InitializerList) {
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std::initializer_list<int> init_list = { 0, 1, 2, 3, 4 };
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ArrayRef<int> A = init_list;
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for (int i = 0; i < 5; ++i)
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EXPECT_EQ(i, A[i]);
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std::vector<int> B = ReturnTest12();
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A = B;
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EXPECT_EQ(1, A[0]);
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EXPECT_EQ(2, A[1]);
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ArgTest12({1, 2});
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}
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TEST(ArrayRefTest, EmptyInitializerList) {
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ArrayRef<int> A = {};
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EXPECT_TRUE(A.empty());
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A = {};
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EXPECT_TRUE(A.empty());
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}
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// Test that makeArrayRef works on ArrayRef (no-op)
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TEST(ArrayRefTest, makeArrayRef) {
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static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
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// No copy expected for non-const ArrayRef (true no-op)
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ArrayRef<int> AR1(A1);
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ArrayRef<int> &AR1Ref = makeArrayRef(AR1);
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EXPECT_EQ(&AR1, &AR1Ref);
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// A copy is expected for non-const ArrayRef (thin copy)
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const ArrayRef<int> AR2(A1);
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const ArrayRef<int> &AR2Ref = makeArrayRef(AR2);
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EXPECT_NE(&AR2Ref, &AR2);
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EXPECT_TRUE(AR2.equals(AR2Ref));
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}
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} // end anonymous namespace
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