David Spickett a76518cadc [lldb][ELF] Return address class map changes from symbol table parsing methods (#91585) ...

Instead of updating the member of the ObjectFileELF instance. This means
that if one object file asks another to parse the symbol table, that
first object's can update its address class map with the same changes
that the other object did.

(I'm not returning a reference to the other object's m_address_class_map
member because there may be other things in there not related to the
symbol table being parsed)

This will fix the code added in
https://github.com/llvm/llvm-project/pull/90622 which broke the test
`Expr/TestStringLiteralExpr.test` on 32 bit Arm Linux.

This happened because we had the program file, then asked for a better
object file, which returned the same program file again. This creates a
second ObjectFileELF for the same file, so when we tell the second
instance to parse the symbol table it actually calls into the first
instance, leaving the address class map of the second instance empty.

Which caused us to put an Arm breakpoint instuction at a Thumb return
address and broke the ability to call mmap.

2024-05-10 09:20:48 +01:00

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