compiler alias analysis: Fix bug in status of map extracts #8686
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As the destructive update pass does not have any support for patching literal maps, as it can do for tuples to ensure that the term that will be destructively updated is on the heap, we must conservatively consider anything extracted from a literal map as aliased. This is not a significant limitation as tracking the alias status of individual associations of non-literal maps is currently considered non feasible.
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jhogberg
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@jhogberg, as far as I can tell this one is now merged to all of 26, 27, and master, shouldn't it be closed? |
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It will close itself when the next 26 patch is released. :-) |
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... turns out that it didn't get closed automatically this time. I've closed the PR manually. |
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As the destructive update pass does not have any support for patching literal maps, as it can do for tuples to ensure that the term that will be destructively updated is on the heap, we must conservatively consider anything extracted from a literal map as aliased.
This is not a significant limitation as tracking the alias status of individual associations of non-literal maps is currently considered non feasible.
This bug is present in 26, 27 as well as in master. I'm not at all sure on the interrelationship between the various maint branches and the patch cannot be just merged forward. To help merging here is what applies to maint-27 and this is what should go into master.