llvm-project

1d83f821 - [lldb][Darwin] Don't add zero-length segments to SectionLoadList (#195206)

[lldb][Darwin] Don't add zero-length segments to SectionLoadList (#195206) On Darwin systems with a shared cache, all the system binaries are combined into a single range of virtual address space, placing all the TEXT segments together, all the DATA segments together, etc. It shrinks the sizes of the segments from their on-disk file size to the actual size needed for their contents, instead of observing page alignment rules for segments. And in one uncommon case, it is possible for a segment to not be put in the shared cache virtual range at all. When DynamicLoaderDarwin adds each file's segments to the Target SectionLoadList (the table showing what VM ranges they are mapped to), we're using the original file's segment sizes. But the in-memory segment sizes may be different for binaries in the shared cache. And for a segment which is eliminated entirely (zero length), we'll get warnings as the next segment is added to the same address in the SectionLoadList. To start with, this PR is handling the special case of these segments that become zero length -- by not adding them to the SectionLoadList at all. rdar://174948380