Jorge Gorbe Moya 314a0d73a8 Fix crash after looking up dwo_id=0 in CU index. ...

In the current state, if getFromHash(0) is called and there's no CU with
dwo_id=0, the lookup will stop at an empty slot, then the check
`Rows[H].getSignature() != S` won't cause the lookup to fail and return
a nullptr (as it should), because the empty slot has a 0 in the
signature field, and a pointer to the empty slot will be incorrectly
returned.

This patch fixes this by using the index field in the hash entry to
check for empty slots: signature = 0 can match a valid hash but
according to the spec the index for an occupied slot will always be
non-zero.

Differential Revision: https://reviews.llvm.org/D91670

2020-11-19 11:15:01 -08:00

9.1 KiB

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