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The existing code explicitly passes a (type name) path around to determine cycles; it also restarts the path for types that "break" a cycle (such as a pointer, function, etc.). This does not work for alias types (whose cycles are broken in a different way). Furthermore, because the path is not passed through all type checker functions that need it, we can't see the path or use it for detection of some cycles (e.g. cycles involving array lengths), which required ad-hoc solutions in those cases. This change introduces an explicit marking scheme for any kind of object; an object is painted in various colors indicating its state. It also introduces an object path (a stack) main- tained with the Checker state, which is available in all type checker functions that need access to it. The change only introduces these mechanisms and exercises the basic functionality, with no effect on the existing code for now. For #25141. Change-Id: I7c28714bdafe6c8d9afedf12a8a887554237337c Reviewed-on: https://go-review.googlesource.com/114517 Reviewed-by: Alan Donovan <adonovan@google.com> |
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