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DenseMapInfo: support std::optional<T> #147851

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Merged
merged 8 commits into from
Jul 10, 2025
+35 −1
Merged

DenseMapInfo: support std::optional<T> #147851

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c93c4c4
[ADT] Implement DenseMapInfo of std::optional<T>
elijahkin Jul 9, 2025
2557b8f
Merge branch 'llvm:main' into patch-1
elijahkin Jul 9, 2025
f7a244c
Registering std::optional<uint32_t> for testing
elijahkin Jul 9, 2025
c8b3e81
Avoiding else after return
elijahkin Jul 9, 2025
fb6a46e
Including <optional> in DenseMapInfo
elijahkin Jul 10, 2025
bf9ece3
Remove newline after template
elijahkin Jul 10, 2025
ddae4e7
Avoid make_optional
elijahkin Jul 10, 2025
6d62db8
Adding getTestKey and getTestValue for std::optional<T>
elijahkin Jul 10, 2025
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27 changes: 27 additions & 0 deletions llvm/include/llvm/ADT/DenseMapInfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <optional>
#include <tuple>
#include <type_traits>
#include <utility>
Expand Down Expand Up @@ -320,6 +321,32 @@ struct DenseMapInfo<Enum, std::enable_if_t<std::is_enum_v<Enum>>> {

static bool isEqual(const Enum &LHS, const Enum &RHS) { return LHS == RHS; }
};

template <typename T> struct DenseMapInfo<std::optional<T>> {
using Optional = std::optional<T>;
using Info = DenseMapInfo<T>;

static inline Optional getEmptyKey() {
return std::make_optional(Info::getEmptyKey());
}

static inline Optional getTombstoneKey() {
return std::make_optional(Info::getTombstoneKey());
}

static unsigned getHashValue(const Optional &OptionalVal) {
return detail::combineHashValue(
OptionalVal.has_value(),
Info::getHashValue(OptionalVal.value_or(Info::getEmptyKey())));
}

static bool isEqual(const Optional &LHS, const Optional &RHS) {
if (LHS && RHS) {
return Info::isEqual(LHS.value(), RHS.value());
}
return !LHS && !RHS;
}
};
} // end namespace llvm

#endif // LLVM_ADT_DENSEMAPINFO_H
5 changes: 4 additions & 1 deletion llvm/unittests/ADT/DenseMapTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <map>
#include <optional>
#include <set>
#include <utility>
#include <variant>
Expand Down Expand Up @@ -117,11 +118,13 @@ typedef ::testing::Types<DenseMap<uint32_t, uint32_t>,
DenseMap<uint32_t *, uint32_t *>,
DenseMap<CtorTester, CtorTester, CtorTesterMapInfo>,
DenseMap<EnumClass, uint32_t>,
DenseMap<std::optional<uint32_t>, uint32_t>,
SmallDenseMap<uint32_t, uint32_t>,
SmallDenseMap<uint32_t *, uint32_t *>,
SmallDenseMap<CtorTester, CtorTester, 4,
CtorTesterMapInfo>,
SmallDenseMap<EnumClass, uint32_t>
SmallDenseMap<EnumClass, uint32_t>,
SmallDenseMap<std::optional<uint32_t>, uint32_t>
> DenseMapTestTypes;
// clang-format on

Expand Down
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