[AST] Rewrite collectExportedImports() to be non-recursive. #74861
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The issue with recursion here is that if there are enough modules involved, this function will blow the process stack, particularly in the case where the `FileUnit`s are not `SourceFile`s, since in that instance a `SmallVector` gets allocated on the stack for each level of the recursion. rdar://130527640
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@swift-ci Please test |
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Explanation: If there are enough imports, the original code would blow the process stack. Switch to using an explicit stack on the heap instead (actually, since it's in a |
DougGregor
approved these changes
Jul 1, 2024
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The issue with recursion here is that if there are enough modules involved, this function will blow the process stack, particularly in the case where the
FileUnits are notSourceFiles, since in that instance aSmallVectorgets allocated on the stack for each level of the recursion.rdar://130527640