[5.7] Explicitly copy defsIDependUpon into an appropriately sized array when initializing SourceFileDependencyGraph.Node #1124
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@swift-ci please test |
…n initializing SourceFileDependencyGraph.Node Previously, the removeAll call below the initializer would trigger CoW. If the scratch buffer was larger than the count, this would result in an unnecesarily large allocation. In a very large file, the source-file-provides-implementation node may have multiple orders of magnitude more edges compared to any other node in the graph, which could lead to excessive memory usage and a large slowdown deallocating the array storage when tearing down the graph. rdar://95648282
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This is now updated with the additional type annotation needed to compile in regular swift CI |
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@swift-ci please test |
artemcm
approved these changes
Jul 15, 2022
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@swift-ci please test |
nkcsgexi
approved these changes
Jul 18, 2022
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5.7 cherry pick of #1119