[lldb] Set static Module's load addresses via ObjectFile (#87439)
This is a followup to
https://github.com/llvm/llvm-project/pull/86359
"[lldb] [ObjectFileMachO] LLVM_COV is not mapped into firmware memory
(#86359)"
where I treat LLVM_COV segments in a Mach-O binary as non-loadable.
There is another codepath in
`DynamicLoaderStatic::LoadAllImagesAtFileAddresses` which is called to
set the load addresses for a Module to the file addresses. It has no
logic to detect a segment that is not loaded in virtual memory
(ObjectFileMachO::SectionIsLoadable), so it would set the load address
for this LLVM_COV segment to the file address and shadow actual code,
breaking lldb behavior.
This method currently sets the load address for any section that doesn't
have a load address set already. This presumes that a Module was added
to the Target, some mechanism set the correct load address for SOME
segments, and then this method is going to set the other segments to a
no-slide value, assuming they were forgotten.
ObjectFile base class doesn't, today, vend a SectionIsLoadable method,
but we do have ObjectFile::SetLoadAddress and at a higher level,
Module::SetLoadAddress, when we're setting the same slide to all
segments.
That's the behavior we want in this method. If any section has a load
address, we don't touch this Module. Otherwise we set all sections to
have a load address that is the same as the file address.
I also audited the other parts of lldb that are calling
SectionList::SectionLoadAddress and looked if they should be more
correctly using Module::SetLoadAddress for the entire binary. But in
most cases, we have the potential for different slides for different
sections so this section-by-section approach must be taken.
rdar://125800290
GitOrigin-RevId: 622851a9059694487811a7f6078312fc2cce5486
1 file changed
