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//===- llvm/unittest/ADT/DenseMapMap.cpp - DenseMap unit tests --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <map>
#include <set>
#include <utility>
#include <variant>
using namespace llvm;
namespace {
uint32_t getTestKey(int i, uint32_t *) { return i; }
uint32_t getTestValue(int i, uint32_t *) { return 42 + i; }
uint32_t *getTestKey(int i, uint32_t **) {
static uint32_t dummy_arr1[8192];
assert(i < 8192 && "Only support 8192 dummy keys.");
return &dummy_arr1[i];
}
uint32_t *getTestValue(int i, uint32_t **) {
static uint32_t dummy_arr1[8192];
assert(i < 8192 && "Only support 8192 dummy keys.");
return &dummy_arr1[i];
}
/// A test class that tries to check that construction and destruction
/// occur correctly.
class CtorTester {
static std::set<CtorTester *> Constructed;
int Value;
public:
explicit CtorTester(int Value = 0) : Value(Value) {
EXPECT_TRUE(Constructed.insert(this).second);
}
CtorTester(uint32_t Value) : Value(Value) {
EXPECT_TRUE(Constructed.insert(this).second);
}
CtorTester(const CtorTester &Arg) : Value(Arg.Value) {
EXPECT_TRUE(Constructed.insert(this).second);
}
CtorTester &operator=(const CtorTester &) = default;
~CtorTester() {
EXPECT_EQ(1u, Constructed.erase(this));
}
operator uint32_t() const { return Value; }
int getValue() const { return Value; }
bool operator==(const CtorTester &RHS) const { return Value == RHS.Value; }
};
std::set<CtorTester *> CtorTester::Constructed;
struct CtorTesterMapInfo {
static inline CtorTester getEmptyKey() { return CtorTester(-1); }
static inline CtorTester getTombstoneKey() { return CtorTester(-2); }
static unsigned getHashValue(const CtorTester &Val) {
return Val.getValue() * 37u;
}
static bool isEqual(const CtorTester &LHS, const CtorTester &RHS) {
return LHS == RHS;
}
};
CtorTester getTestKey(int i, CtorTester *) { return CtorTester(i); }
CtorTester getTestValue(int i, CtorTester *) { return CtorTester(42 + i); }
// Test fixture, with helper functions implemented by forwarding to global
// function overloads selected by component types of the type parameter. This
// allows all of the map implementations to be tested with shared
// implementations of helper routines.
template <typename T>
class DenseMapTest : public ::testing::Test {
protected:
T Map;
static typename T::key_type *const dummy_key_ptr;
static typename T::mapped_type *const dummy_value_ptr;
typename T::key_type getKey(int i = 0) {
return getTestKey(i, dummy_key_ptr);
}
typename T::mapped_type getValue(int i = 0) {
return getTestValue(i, dummy_value_ptr);
}
};
template <typename T>
typename T::key_type *const DenseMapTest<T>::dummy_key_ptr = nullptr;
template <typename T>
typename T::mapped_type *const DenseMapTest<T>::dummy_value_ptr = nullptr;
// Register these types for testing.
typedef ::testing::Types<DenseMap<uint32_t, uint32_t>,
DenseMap<uint32_t *, uint32_t *>,
DenseMap<CtorTester, CtorTester, CtorTesterMapInfo>,
SmallDenseMap<uint32_t, uint32_t>,
SmallDenseMap<uint32_t *, uint32_t *>,
SmallDenseMap<CtorTester, CtorTester, 4,
CtorTesterMapInfo>
> DenseMapTestTypes;
TYPED_TEST_SUITE(DenseMapTest, DenseMapTestTypes, );
// Empty map tests
TYPED_TEST(DenseMapTest, EmptyIntMapTest) {
// Size tests
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
// Iterator tests
EXPECT_TRUE(this->Map.begin() == this->Map.end());
// Lookup tests
EXPECT_FALSE(this->Map.count(this->getKey()));
EXPECT_TRUE(this->Map.find(this->getKey()) == this->Map.end());
EXPECT_EQ(typename TypeParam::mapped_type(),
this->Map.lookup(this->getKey()));
}
// Constant map tests
TYPED_TEST(DenseMapTest, ConstEmptyMapTest) {
const TypeParam &ConstMap = this->Map;
EXPECT_EQ(0u, ConstMap.size());
EXPECT_TRUE(ConstMap.empty());
EXPECT_TRUE(ConstMap.begin() == ConstMap.end());
}
// A map with a single entry
TYPED_TEST(DenseMapTest, SingleEntryMapTest) {
this->Map[this->getKey()] = this->getValue();
// Size tests
EXPECT_EQ(1u, this->Map.size());
EXPECT_FALSE(this->Map.begin() == this->Map.end());
EXPECT_FALSE(this->Map.empty());
// Iterator tests
typename TypeParam::iterator it = this->Map.begin();
EXPECT_EQ(this->getKey(), it->first);
EXPECT_EQ(this->getValue(), it->second);
++it;
EXPECT_TRUE(it == this->Map.end());
// Lookup tests
EXPECT_TRUE(this->Map.count(this->getKey()));
EXPECT_TRUE(this->Map.find(this->getKey()) == this->Map.begin());
EXPECT_EQ(this->getValue(), this->Map.lookup(this->getKey()));
EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
}
// Test clear() method
TYPED_TEST(DenseMapTest, ClearTest) {
this->Map[this->getKey()] = this->getValue();
this->Map.clear();
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
EXPECT_TRUE(this->Map.begin() == this->Map.end());
}
// Test erase(iterator) method
TYPED_TEST(DenseMapTest, EraseTest) {
this->Map[this->getKey()] = this->getValue();
this->Map.erase(this->Map.begin());
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
EXPECT_TRUE(this->Map.begin() == this->Map.end());
}
// Test erase(value) method
TYPED_TEST(DenseMapTest, EraseTest2) {
this->Map[this->getKey()] = this->getValue();
this->Map.erase(this->getKey());
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
EXPECT_TRUE(this->Map.begin() == this->Map.end());
}
// Test insert() method
TYPED_TEST(DenseMapTest, InsertTest) {
this->Map.insert(std::make_pair(this->getKey(), this->getValue()));
EXPECT_EQ(1u, this->Map.size());
EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
}
// Test copy constructor method
TYPED_TEST(DenseMapTest, CopyConstructorTest) {
this->Map[this->getKey()] = this->getValue();
TypeParam copyMap(this->Map);
EXPECT_EQ(1u, copyMap.size());
EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
}
// Test copy constructor method where SmallDenseMap isn't small.
TYPED_TEST(DenseMapTest, CopyConstructorNotSmallTest) {
for (int Key = 0; Key < 5; ++Key)
this->Map[this->getKey(Key)] = this->getValue(Key);
TypeParam copyMap(this->Map);
EXPECT_EQ(5u, copyMap.size());
for (int Key = 0; Key < 5; ++Key)
EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
}
// Test copying from a default-constructed map.
TYPED_TEST(DenseMapTest, CopyConstructorFromDefaultTest) {
TypeParam copyMap(this->Map);
EXPECT_TRUE(copyMap.empty());
}
// Test copying from an empty map where SmallDenseMap isn't small.
TYPED_TEST(DenseMapTest, CopyConstructorFromEmptyTest) {
for (int Key = 0; Key < 5; ++Key)
this->Map[this->getKey(Key)] = this->getValue(Key);
this->Map.clear();
TypeParam copyMap(this->Map);
EXPECT_TRUE(copyMap.empty());
}
// Test assignment operator method
TYPED_TEST(DenseMapTest, AssignmentTest) {
this->Map[this->getKey()] = this->getValue();
TypeParam copyMap = this->Map;
EXPECT_EQ(1u, copyMap.size());
EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
// test self-assignment.
copyMap = static_cast<TypeParam &>(copyMap);
EXPECT_EQ(1u, copyMap.size());
EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
}
TYPED_TEST(DenseMapTest, AssignmentTestNotSmall) {
for (int Key = 0; Key < 5; ++Key)
this->Map[this->getKey(Key)] = this->getValue(Key);
TypeParam copyMap = this->Map;
EXPECT_EQ(5u, copyMap.size());
for (int Key = 0; Key < 5; ++Key)
EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
// test self-assignment.
copyMap = static_cast<TypeParam &>(copyMap);
EXPECT_EQ(5u, copyMap.size());
for (int Key = 0; Key < 5; ++Key)
EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
}
// Test swap method
TYPED_TEST(DenseMapTest, SwapTest) {
this->Map[this->getKey()] = this->getValue();
TypeParam otherMap;
this->Map.swap(otherMap);
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
EXPECT_EQ(1u, otherMap.size());
EXPECT_EQ(this->getValue(), otherMap[this->getKey()]);
this->Map.swap(otherMap);
EXPECT_EQ(0u, otherMap.size());
EXPECT_TRUE(otherMap.empty());
EXPECT_EQ(1u, this->Map.size());
EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
// Make this more interesting by inserting 100 numbers into the map.
for (int i = 0; i < 100; ++i)
this->Map[this->getKey(i)] = this->getValue(i);
this->Map.swap(otherMap);
EXPECT_EQ(0u, this->Map.size());
EXPECT_TRUE(this->Map.empty());
EXPECT_EQ(100u, otherMap.size());
for (int i = 0; i < 100; ++i)
EXPECT_EQ(this->getValue(i), otherMap[this->getKey(i)]);
this->Map.swap(otherMap);
EXPECT_EQ(0u, otherMap.size());
EXPECT_TRUE(otherMap.empty());
EXPECT_EQ(100u, this->Map.size());
for (int i = 0; i < 100; ++i)
EXPECT_EQ(this->getValue(i), this->Map[this->getKey(i)]);
}
// A more complex iteration test
TYPED_TEST(DenseMapTest, IterationTest) {
bool visited[100];
std::map<typename TypeParam::key_type, unsigned> visitedIndex;
// Insert 100 numbers into the map
for (int i = 0; i < 100; ++i) {
visited[i] = false;
visitedIndex[this->getKey(i)] = i;
this->Map[this->getKey(i)] = this->getValue(i);
}
// Iterate over all numbers and mark each one found.
for (typename TypeParam::iterator it = this->Map.begin();
it != this->Map.end(); ++it)
visited[visitedIndex[it->first]] = true;
// Ensure every number was visited.
for (int i = 0; i < 100; ++i)
ASSERT_TRUE(visited[i]) << "Entry #" << i << " was never visited";
}
// const_iterator test
TYPED_TEST(DenseMapTest, ConstIteratorTest) {
// Check conversion from iterator to const_iterator.
typename TypeParam::iterator it = this->Map.begin();
typename TypeParam::const_iterator cit(it);
EXPECT_TRUE(it == cit);
// Check copying of const_iterators.
typename TypeParam::const_iterator cit2(cit);
EXPECT_TRUE(cit == cit2);
}
namespace {
// Simple class that counts how many moves and copy happens when growing a map
struct CountCopyAndMove {
static int Move;
static int Copy;
CountCopyAndMove() {}
CountCopyAndMove(const CountCopyAndMove &) { Copy++; }
CountCopyAndMove &operator=(const CountCopyAndMove &) {
Copy++;
return *this;
}
CountCopyAndMove(CountCopyAndMove &&) { Move++; }
CountCopyAndMove &operator=(const CountCopyAndMove &&) {
Move++;
return *this;
}
};
int CountCopyAndMove::Copy = 0;
int CountCopyAndMove::Move = 0;
} // anonymous namespace
// Test initializer list construction.
TEST(DenseMapCustomTest, InitializerList) {
DenseMap<int, int> M({{0, 0}, {0, 1}, {1, 2}});
EXPECT_EQ(2u, M.size());
EXPECT_EQ(1u, M.count(0));
EXPECT_EQ(0, M[0]);
EXPECT_EQ(1u, M.count(1));
EXPECT_EQ(2, M[1]);
}
// Test initializer list construction.
TEST(DenseMapCustomTest, EqualityComparison) {
DenseMap<int, int> M1({{0, 0}, {1, 2}});
DenseMap<int, int> M2({{0, 0}, {1, 2}});
DenseMap<int, int> M3({{0, 0}, {1, 3}});
EXPECT_EQ(M1, M2);
EXPECT_NE(M1, M3);
}
// Test for the default minimum size of a DenseMap
TEST(DenseMapCustomTest, DefaultMinReservedSizeTest) {
// IF THIS VALUE CHANGE, please update InitialSizeTest, InitFromIterator, and
// ReserveTest as well!
const int ExpectedInitialBucketCount = 64;
// Formula from DenseMap::getMinBucketToReserveForEntries()
const int ExpectedMaxInitialEntries = ExpectedInitialBucketCount * 3 / 4 - 1;
DenseMap<int, CountCopyAndMove> Map;
// Will allocate 64 buckets
Map.reserve(1);
unsigned MemorySize = Map.getMemorySize();
CountCopyAndMove::Copy = 0;
CountCopyAndMove::Move = 0;
for (int i = 0; i < ExpectedMaxInitialEntries; ++i)
Map.insert(std::pair<int, CountCopyAndMove>(std::piecewise_construct,
std::forward_as_tuple(i),
std::forward_as_tuple()));
// Check that we didn't grow
EXPECT_EQ(MemorySize, Map.getMemorySize());
// Check that move was called the expected number of times
EXPECT_EQ(ExpectedMaxInitialEntries, CountCopyAndMove::Move);
// Check that no copy occurred
EXPECT_EQ(0, CountCopyAndMove::Copy);
// Adding one extra element should grow the map
Map.insert(std::pair<int, CountCopyAndMove>(
std::piecewise_construct,
std::forward_as_tuple(ExpectedMaxInitialEntries),
std::forward_as_tuple()));
// Check that we grew
EXPECT_NE(MemorySize, Map.getMemorySize());
// Check that move was called the expected number of times
// This relies on move-construction elision, and cannot be reliably tested.
// EXPECT_EQ(ExpectedMaxInitialEntries + 2, CountCopyAndMove::Move);
// Check that no copy occurred
EXPECT_EQ(0, CountCopyAndMove::Copy);
}
// Make sure creating the map with an initial size of N actually gives us enough
// buckets to insert N items without increasing allocation size.
TEST(DenseMapCustomTest, InitialSizeTest) {
// Test a few different sizes, 48 is *not* a random choice: we need a value
// that is 2/3 of a power of two to stress the grow() condition, and the power
// of two has to be at least 64 because of minimum size allocation in the
// DenseMap (see DefaultMinReservedSizeTest). 66 is a value just above the
// 64 default init.
for (auto Size : {1, 2, 48, 66}) {
DenseMap<int, CountCopyAndMove> Map(Size);
unsigned MemorySize = Map.getMemorySize();
CountCopyAndMove::Copy = 0;
CountCopyAndMove::Move = 0;
for (int i = 0; i < Size; ++i)
Map.insert(std::pair<int, CountCopyAndMove>(std::piecewise_construct,
std::forward_as_tuple(i),
std::forward_as_tuple()));
// Check that we didn't grow
EXPECT_EQ(MemorySize, Map.getMemorySize());
// Check that move was called the expected number of times
EXPECT_EQ(Size, CountCopyAndMove::Move);
// Check that no copy occurred
EXPECT_EQ(0, CountCopyAndMove::Copy);
}
}
// Make sure creating the map with a iterator range does not trigger grow()
TEST(DenseMapCustomTest, InitFromIterator) {
std::vector<std::pair<int, CountCopyAndMove>> Values;
// The size is a random value greater than 64 (hardcoded DenseMap min init)
const int Count = 65;
Values.reserve(Count);
for (int i = 0; i < Count; i++)
Values.emplace_back(i, CountCopyAndMove());
CountCopyAndMove::Move = 0;
CountCopyAndMove::Copy = 0;
DenseMap<int, CountCopyAndMove> Map(Values.begin(), Values.end());
// Check that no move occurred
EXPECT_EQ(0, CountCopyAndMove::Move);
// Check that copy was called the expected number of times
EXPECT_EQ(Count, CountCopyAndMove::Copy);
}
// Make sure reserve actually gives us enough buckets to insert N items
// without increasing allocation size.
TEST(DenseMapCustomTest, ReserveTest) {
// Test a few different size, 48 is *not* a random choice: we need a value
// that is 2/3 of a power of two to stress the grow() condition, and the power
// of two has to be at least 64 because of minimum size allocation in the
// DenseMap (see DefaultMinReservedSizeTest). 66 is a value just above the
// 64 default init.
for (auto Size : {1, 2, 48, 66}) {
DenseMap<int, CountCopyAndMove> Map;
Map.reserve(Size);
unsigned MemorySize = Map.getMemorySize();
CountCopyAndMove::Copy = 0;
CountCopyAndMove::Move = 0;
for (int i = 0; i < Size; ++i)
Map.insert(std::pair<int, CountCopyAndMove>(std::piecewise_construct,
std::forward_as_tuple(i),
std::forward_as_tuple()));
// Check that we didn't grow
EXPECT_EQ(MemorySize, Map.getMemorySize());
// Check that move was called the expected number of times
EXPECT_EQ(Size, CountCopyAndMove::Move);
// Check that no copy occurred
EXPECT_EQ(0, CountCopyAndMove::Copy);
}
}
// Make sure DenseMap works with StringRef keys.
TEST(DenseMapCustomTest, StringRefTest) {
DenseMap<StringRef, int> M;
M["a"] = 1;
M["b"] = 2;
M["c"] = 3;
EXPECT_EQ(3u, M.size());
EXPECT_EQ(1, M.lookup("a"));
EXPECT_EQ(2, M.lookup("b"));
EXPECT_EQ(3, M.lookup("c"));
EXPECT_EQ(0, M.lookup("q"));
// Test the empty string, spelled various ways.
EXPECT_EQ(0, M.lookup(""));
EXPECT_EQ(0, M.lookup(StringRef()));
EXPECT_EQ(0, M.lookup(StringRef("a", 0)));
M[""] = 42;
EXPECT_EQ(42, M.lookup(""));
EXPECT_EQ(42, M.lookup(StringRef()));
EXPECT_EQ(42, M.lookup(StringRef("a", 0)));
}
// Key traits that allows lookup with either an unsigned or char* key;
// In the latter case, "a" == 0, "b" == 1 and so on.
struct TestDenseMapInfo {
static inline unsigned getEmptyKey() { return ~0; }
static inline unsigned getTombstoneKey() { return ~0U - 1; }
static unsigned getHashValue(const unsigned& Val) { return Val * 37U; }
static unsigned getHashValue(const char* Val) {
return (unsigned)(Val[0] - 'a') * 37U;
}
static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
return LHS == RHS;
}
static bool isEqual(const char* LHS, const unsigned& RHS) {
return (unsigned)(LHS[0] - 'a') == RHS;
}
};
// find_as() tests
TEST(DenseMapCustomTest, FindAsTest) {
DenseMap<unsigned, unsigned, TestDenseMapInfo> map;
map[0] = 1;
map[1] = 2;
map[2] = 3;
// Size tests
EXPECT_EQ(3u, map.size());
// Normal lookup tests
EXPECT_EQ(1u, map.count(1));
EXPECT_EQ(1u, map.find(0)->second);
EXPECT_EQ(2u, map.find(1)->second);
EXPECT_EQ(3u, map.find(2)->second);
EXPECT_TRUE(map.find(3) == map.end());
// find_as() tests
EXPECT_EQ(1u, map.find_as("a")->second);
EXPECT_EQ(2u, map.find_as("b")->second);
EXPECT_EQ(3u, map.find_as("c")->second);
EXPECT_TRUE(map.find_as("d") == map.end());
}
TEST(DenseMapCustomTest, SmallDenseMapInitializerList) {
SmallDenseMap<int, int> M = {{0, 0}, {0, 1}, {1, 2}};
EXPECT_EQ(2u, M.size());
EXPECT_EQ(1u, M.count(0));
EXPECT_EQ(0, M[0]);
EXPECT_EQ(1u, M.count(1));
EXPECT_EQ(2, M[1]);
}
struct ContiguousDenseMapInfo {
static inline unsigned getEmptyKey() { return ~0; }
static inline unsigned getTombstoneKey() { return ~0U - 1; }
static unsigned getHashValue(const unsigned& Val) { return Val; }
static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
return LHS == RHS;
}
};
// Test that filling a small dense map with exactly the number of elements in
// the map grows to have enough space for an empty bucket.
TEST(DenseMapCustomTest, SmallDenseMapGrowTest) {
SmallDenseMap<unsigned, unsigned, 32, ContiguousDenseMapInfo> map;
// Add some number of elements, then delete a few to leave us some tombstones.
// If we just filled the map with 32 elements we'd grow because of not enough
// tombstones which masks the issue here.
for (unsigned i = 0; i < 20; ++i)
map[i] = i + 1;
for (unsigned i = 0; i < 10; ++i)
map.erase(i);
for (unsigned i = 20; i < 32; ++i)
map[i] = i + 1;
// Size tests
EXPECT_EQ(22u, map.size());
// Try to find an element which doesn't exist. There was a bug in
// SmallDenseMap which led to a map with num elements == small capacity not
// having an empty bucket any more. Finding an element not in the map would
// therefore never terminate.
EXPECT_TRUE(map.find(32) == map.end());
}
TEST(DenseMapCustomTest, LargeSmallDenseMapCompaction) {
SmallDenseMap<unsigned, unsigned, 128, ContiguousDenseMapInfo> map;
// Fill to < 3/4 load.
for (unsigned i = 0; i < 95; ++i)
map[i] = i;
// And erase, leaving behind tombstones.
for (unsigned i = 0; i < 95; ++i)
map.erase(i);
// Fill further, so that less than 1/8 are empty, but still below 3/4 load.
for (unsigned i = 95; i < 128; ++i)
map[i] = i;
EXPECT_EQ(33u, map.size());
// Similar to the previous test, check for a non-existing element, as an
// indirect check that tombstones have been removed.
EXPECT_TRUE(map.find(0) == map.end());
}
TEST(DenseMapCustomTest, SmallDenseMapWithNumBucketsNonPowerOf2) {
// Is not power of 2.
const unsigned NumInitBuckets = 33;
// Power of 2 less then NumInitBuckets.
constexpr unsigned InlineBuckets = 4;
// Constructor should not trigger assert.
SmallDenseMap<int, int, InlineBuckets> map(NumInitBuckets);
}
TEST(DenseMapCustomTest, TryEmplaceTest) {
DenseMap<int, std::unique_ptr<int>> Map;
std::unique_ptr<int> P(new int(2));
auto Try1 = Map.try_emplace(0, new int(1));
EXPECT_TRUE(Try1.second);
auto Try2 = Map.try_emplace(0, std::move(P));
EXPECT_FALSE(Try2.second);
EXPECT_EQ(Try1.first, Try2.first);
EXPECT_NE(nullptr, P);
}
TEST(DenseMapCustomTest, ConstTest) {
// Test that const pointers work okay for count and find, even when the
// underlying map is a non-const pointer.
DenseMap<int *, int> Map;
int A;
int *B = &A;
const int *C = &A;
Map.insert({B, 0});
EXPECT_EQ(Map.count(B), 1u);
EXPECT_EQ(Map.count(C), 1u);
EXPECT_NE(Map.find(B), Map.end());
EXPECT_NE(Map.find(C), Map.end());
}
struct IncompleteStruct;
TEST(DenseMapCustomTest, OpaquePointerKey) {
// Test that we can use a pointer to an incomplete type as a DenseMap key.
// This is an important build time optimization, since many classes have
// DenseMap members.
DenseMap<IncompleteStruct *, int> Map;
int Keys[3] = {0, 0, 0};
IncompleteStruct *K1 = reinterpret_cast<IncompleteStruct *>(&Keys[0]);
IncompleteStruct *K2 = reinterpret_cast<IncompleteStruct *>(&Keys[1]);
IncompleteStruct *K3 = reinterpret_cast<IncompleteStruct *>(&Keys[2]);
Map.insert({K1, 1});
Map.insert({K2, 2});
Map.insert({K3, 3});
EXPECT_EQ(Map.count(K1), 1u);
EXPECT_EQ(Map[K1], 1);
EXPECT_EQ(Map[K2], 2);
EXPECT_EQ(Map[K3], 3);
Map.clear();
EXPECT_EQ(Map.find(K1), Map.end());
EXPECT_EQ(Map.find(K2), Map.end());
EXPECT_EQ(Map.find(K3), Map.end());
}
} // namespace
namespace {
struct A {
A(int value) : value(value) {}
int value;
};
struct B : public A {
using A::A;
};
} // namespace
namespace llvm {
template <typename T>
struct DenseMapInfo<T, std::enable_if_t<std::is_base_of_v<A, T>>> {
static inline T getEmptyKey() { return {static_cast<int>(~0)}; }
static inline T getTombstoneKey() { return {static_cast<int>(~0U - 1)}; }
static unsigned getHashValue(const T &Val) { return Val.value; }
static bool isEqual(const T &LHS, const T &RHS) {
return LHS.value == RHS.value;
}
};
} // namespace llvm
namespace {
TEST(DenseMapCustomTest, SFINAEMapInfo) {
// Test that we can use a pointer to an incomplete type as a DenseMap key.
// This is an important build time optimization, since many classes have
// DenseMap members.
DenseMap<B, int> Map;
B Keys[3] = {{0}, {1}, {2}};
Map.insert({Keys[0], 1});
Map.insert({Keys[1], 2});
Map.insert({Keys[2], 3});
EXPECT_EQ(Map.count(Keys[0]), 1u);
EXPECT_EQ(Map[Keys[0]], 1);
EXPECT_EQ(Map[Keys[1]], 2);
EXPECT_EQ(Map[Keys[2]], 3);
Map.clear();
EXPECT_EQ(Map.find(Keys[0]), Map.end());
EXPECT_EQ(Map.find(Keys[1]), Map.end());
EXPECT_EQ(Map.find(Keys[2]), Map.end());
}
TEST(DenseMapCustomTest, VariantSupport) {
using variant = std::variant<int, int>;
DenseMap<variant, int> Map;
variant Keys[] = {
variant(std::in_place_index<0>, 1),
variant(std::in_place_index<1>, 1),
};
Map.try_emplace(Keys[0], 0);
Map.try_emplace(Keys[1], 1);
EXPECT_THAT(Map, testing::SizeIs(2));
EXPECT_NE(DenseMapInfo<variant>::getHashValue(Keys[0]),
DenseMapInfo<variant>::getHashValue(Keys[1]));
}
} // namespace