Start node has no immediate dominator #111547
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Would it be more consistent to make the |
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Right now there is no other information that would describe which nodes are reachable, nor which node is the start node (the code is generic and works with arbitrary control flow graphs, not just MIR basic blocks). Of course, I can add information about the start node, if you prefer that approach. |
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Yes, that would be more natural. The algorithm in this file is complicated enough to avoid adding corner cases. |
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Change the immediate_dominator return type to Option, and use None to indicate that node has no immediate dominator. Also fix the issue where the start node would be returned as its own immediate dominator.
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Thanks! |
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…illot Start node has no immediate dominator Change the immediate_dominator return type to Option, and use None to indicate that node has no immediate dominator. Also fix the issue where the start node would be returned as its own immediate dominator.
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#102673 (Update doc for `PhantomData` to match code example) - rust-lang#111531 (Fix ice caused by shorthand fields in NoFieldsForFnCall) - rust-lang#111547 (Start node has no immediate dominator) - rust-lang#111548 (add util function to TokenStream to eliminate some clones) - rust-lang#111560 (Simplify find_width_of_character_at_span.) - rust-lang#111569 (Appease lints) - rust-lang#111581 (Fix some misleading and copy-pasted `Pattern` examples) - rust-lang#111582 ((docs) Change "wanting" to "want") Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Change the immediate_dominator return type to Option, and use None to
indicate that node has no immediate dominator.
Also fix the issue where the start node would be returned as its own
immediate dominator.