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AK+LibRegex: Only set node metadata on Trie::ensure_child if missing

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a290034a81 passed an empty vector to this,
which caused nodes that appeared multiple times to reset the trie
metadata...which broke the optimisation.

This patchset makes the function take a 'provide missing metadata'
function instead, and only invokes it when the node is missing rather
than unconditionally setting the metadata on all nodes.
This commit is contained in:
Ali Mohammad Pur
2025-11-20 23:47:21 +01:00
committed by Ali Mohammad Pur
parent 2c5beeabe3
commit d5d37abfa5
Notes: github-actions[bot] 2025-11-21 01:47:30 +00:00 
Author: https://github.com/alimpfard
Commit: https://github.com/LadybirdBrowser/ladybird/commit/d5d37abfa57
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6890
2 changed files with 17 additions and 11 deletions
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26
AK/Trie.h
View File

@@ -95,23 +95,29 @@ public:
ValueType const& value() const { return m_value; }
ValueType& value() { return m_value; }
ErrorOr<Trie*> ensure_child(ValueType value, Optional<MetadataType> metadata = {})
template<typename F = Function<Optional<MetadataType>()>>
ErrorOr<Trie*> ensure_child(ValueType value, F metadata_if_missing = [] { return OptionalNone {}; })
{
auto it = m_children.find(value);
if (it == m_children.end()) {
OwnPtr<Trie> node;
if constexpr (requires { { value->try_clone() } -> SpecializationOf<ErrorOr>; })
node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(TRY(value->try_clone()), move(metadata))));
Optional<MetadataType> missing_metadata;
if constexpr (requires { { metadata_if_missing() } -> SpecializationOf<ErrorOr>; })
missing_metadata = TRY(metadata_if_missing());
else
node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(value, move(metadata))));
missing_metadata = metadata_if_missing();
if constexpr (requires { { value->try_clone() } -> SpecializationOf<ErrorOr>; })
node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(TRY(value->try_clone()), move(missing_metadata))));
else
node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(value, move(missing_metadata))));
auto& node_ref = *node;
TRY(m_children.try_set(move(value), node.release_nonnull()));
return &static_cast<BaseType&>(node_ref);
}
auto& node_ref = *it->value;
if (metadata.has_value())
node_ref.m_metadata = move(metadata);
return &static_cast<BaseType&>(node_ref);
}
@@ -129,9 +135,9 @@ public:
};
for (; it != end; ++it) {
if constexpr (requires { { ValueType::ElementType::try_create(*it) } -> SpecializationOf<ErrorOr>; })
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)), TRY(invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it)))));
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)), [&] { return invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it); })));
else
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it, TRY(invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it)))));
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it, [&] { return invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it); })));
}
last_root_node->set_metadata(move(metadata));
return static_cast<BaseType*>(last_root_node);
@@ -144,9 +150,9 @@ public:
Trie* last_root_node = &traverse_until_last_accessible_node(it, end);
for (; it != end; ++it) {
if constexpr (requires { { ValueType::ElementType::try_create(*it) } -> SpecializationOf<ErrorOr>; })
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)), {})));
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)))));
else
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it, {})));
last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it)));
}
return static_cast<BaseType*>(last_root_node);
}

2
Libraries/LibRegex/RegexOptimizer.cpp
View File

@@ -1467,7 +1467,7 @@ void Optimizer::append_alternation(ByteCode& target, Span<ByteCode> alternatives
node_key_bytes.append(edge.jump_insn);
}
active_node = static_cast<decltype(active_node)>(MUST(active_node->ensure_child(DisjointSpans<ByteCodeValueType const> { move(node_key_bytes) }, Vector<NodeMetadataEntry> {})));
active_node = static_cast<decltype(active_node)>(MUST(active_node->ensure_child(DisjointSpans<ByteCodeValueType const> { move(node_key_bytes) }, [] -> Vector<NodeMetadataEntry> { return {}; })));
auto next_compare = [&alternative, &state](StaticallyInterpretedCompares& compares) {
TemporaryChange state_change { state.instruction_position, state.instruction_position };