80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/DenseHash.h"
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#include "doctest.h"
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/** So... why are we picking a very specific number to fill the DenseHash(Map|Set)?
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*
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* That's because that's the count that happens to trigger a specific bug.
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*
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* DHT determines if it is full by checking whether the count is greater than or equal to 75% of
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* its capacity. Once this condition triggers, it rehashes everything by doubling its buffer.
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*
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* If DHT gets rehashed, the iterator gets invalidated, but it's very important that we support
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* the use case of overwriting/merging DHTs while iterating.
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*/
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TEST_SUITE_BEGIN("DenseHashTests");
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TEST_CASE("overwriting_an_existing_field_when_full_shouldnt_rehash")
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{
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// See the note at the top on why these numbers were chosen.
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Luau::DenseHashMap<int, int> m{-1};
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for (int i = 0; i < 12; ++i)
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m[i] = i;
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REQUIRE(m.size() == 12);
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for (auto [k, a] : m)
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m[k] = a + 1;
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for (size_t i = 0; i < m.size(); ++i)
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{
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int* a = m.find(int(i));
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REQUIRE(a);
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CHECK(i + 1 == *a);
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}
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}
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TEST_CASE("merging_another_map_and_resolve_conflicts_that_also_just_so_happens_to_rehash_while_iterating")
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{
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// See the note at the top on why these numbers were chosen.
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Luau::DenseHashMap<int, int> m1{-1};
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for (int i = 0; i < 12; ++i)
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m1[i] = i;
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Luau::DenseHashMap<int, int> m2{-1};
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for (int i = 8; i < 24; ++i)
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m2[i] = i;
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REQUIRE(m1.size() == 12);
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REQUIRE(m2.size() == 16);
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for (auto [k, a] : m1)
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{
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if (int* b = m2.find(k))
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m1[k] = a + *b;
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}
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for (auto [k, a] : m2)
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{
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if (!m1.find(k))
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m1[k] = a;
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}
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REQUIRE(m1.size() == 24);
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for (size_t i = 0; i < m1.size(); ++i)
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{
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int* a = m1.find(int(i));
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REQUIRE(a);
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if (i < 8 || i >= 12)
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CHECK(i == *a);
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else
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CHECK(i + i == *a);
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}
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}
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TEST_SUITE_END();
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