110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
//===- llvm/unittest/Support/ReverseIterationTest.cpp ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===---------------------------------------------------------------------===//
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//
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// Reverse Iteration unit tests.
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//
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//===---------------------------------------------------------------------===//
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#include "llvm/Support/ReverseIteration.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseMapInfo.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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TEST(ReverseIterationTest, DenseMapTest1) {
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static_assert(detail::IsPointerLike<int *>::value,
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"int * is pointer-like");
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static_assert(detail::IsPointerLike<uintptr_t>::value,
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"uintptr_t is pointer-like");
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static_assert(!detail::IsPointerLike<int>::value,
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"int is not pointer-like");
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static_assert(detail::IsPointerLike<void *>::value,
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"void * is pointer-like");
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struct IncompleteType;
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static_assert(detail::IsPointerLike<IncompleteType *>::value,
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"incomplete * is pointer-like");
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// For a DenseMap with non-pointer-like keys, forward iteration equals
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// reverse iteration.
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DenseMap<int, int> Map;
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int Keys[] = { 1, 2, 3, 4 };
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// Insert keys into the DenseMap.
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for (auto Key: Keys)
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Map[Key] = 0;
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// Note: This is the observed order of keys in the DenseMap.
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// If there is any change in the behavior of the DenseMap, this order
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// would need to be adjusted accordingly.
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int IterKeys[] = { 2, 4, 1, 3 };
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// Check that the DenseMap is iterated in the expected order.
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for (const auto &Tuple : zip(Map, IterKeys))
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ASSERT_EQ(std::get<0>(Tuple).first, std::get<1>(Tuple));
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// Check operator++ (post-increment).
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int i = 0;
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for (auto iter = Map.begin(), end = Map.end(); iter != end; iter++, ++i)
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ASSERT_EQ(iter->first, IterKeys[i]);
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}
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// Define a pointer-like int.
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struct PtrLikeInt { int value; };
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namespace llvm {
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template<> struct DenseMapInfo<PtrLikeInt *> {
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static PtrLikeInt *getEmptyKey() {
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static PtrLikeInt EmptyKey;
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return &EmptyKey;
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}
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static PtrLikeInt *getTombstoneKey() {
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static PtrLikeInt TombstoneKey;
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return &TombstoneKey;
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}
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static int getHashValue(const PtrLikeInt *P) {
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return P->value;
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}
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static bool isEqual(const PtrLikeInt *LHS, const PtrLikeInt *RHS) {
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return LHS == RHS;
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}
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};
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} // end namespace llvm
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TEST(ReverseIterationTest, DenseMapTest2) {
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static_assert(detail::IsPointerLike<PtrLikeInt *>::value,
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"PtrLikeInt * is pointer-like");
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PtrLikeInt a = {4}, b = {8}, c = {12}, d = {16};
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PtrLikeInt *Keys[] = { &a, &b, &c, &d };
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// Insert keys into the DenseMap.
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DenseMap<PtrLikeInt *, int> Map;
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for (auto *Key : Keys)
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Map[Key] = Key->value;
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// Note: If there is any change in the behavior of the DenseMap,
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// the observed order of keys would need to be adjusted accordingly.
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if (shouldReverseIterate<PtrLikeInt *>())
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std::reverse(&Keys[0], &Keys[4]);
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// Check that the DenseMap is iterated in the expected order.
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for (const auto &Tuple : zip(Map, Keys))
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ASSERT_EQ(std::get<0>(Tuple).second, std::get<1>(Tuple)->value);
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// Check operator++ (post-increment).
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int i = 0;
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for (auto iter = Map.begin(), end = Map.end(); iter != end; iter++, ++i)
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ASSERT_EQ(iter->second, Keys[i]->value);
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}
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