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5f290c090a
Only using that change in StringRef already decreases the number of preoprocessed lines from 7837621 to 7776151 for LLVMSupport Perhaps more interestingly, it shows that many files were relying on the inclusion of StringRef.h to have the declaration from STLExtras.h. This patch tries hard to patch relevant part of llvm-project impacted by this hidden dependency removal. Potential impact: - "llvm/ADT/StringRef.h" no longer includes <memory>, "llvm/ADT/Optional.h" nor "llvm/ADT/STLExtras.h" Related Discourse thread: https://llvm.discourse.group/t/include-what-you-use-include-cleanup/5831
111 lines
3.4 KiB
C++
111 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 "llvm/ADT/STLExtras.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 (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 (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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