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This test failed during testing on the RISC-V target because we couldn't
strip the main label from the binary. main is dynamically linked when
the -fPIC flag is enabled. The RISC-V ABI requires that executables
support loading at arbitrary addresses to enable shared libraries and
secure loading (ASLR). In PIC mode, function addresses cannot be
hardcoded in the code. Instead, code is generated to load addresses from
the GOT/PLT tables, which are initialized by the dynamic loader. The
reference to main thus ends up in .dynsym and is dynamically bound. We
cannot strip main or any other dynamically linked functions because
these functions are referenced indirectly via dynamic linking tables
(.plt and .got). Removing these symbols would break the dynamic linking
mechanism needed to resolve function addresses at runtime, causing the
executable to fail to correctly call them.
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Sections now support specifying:
- user IDs
- file offset/size
- alignment
- flags
- bool values for fake, encrypted and thread specific sections
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This patch adds the ability to create subsections in a section and
allows permissions to be specified.
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ObjectFileJSON sections didn't work, they were set to zero all of the
time. Fixed the bug and fixed the test to ensure it was testing real
values.
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A follow-up for https://github.com/llvm/llvm-project/pull/111816.
This is to fix buildbot failure
https://lab.llvm.org/staging/#/builders/195/builds/4242.
TestSymbolFileJSON.py doesn't pass with llvm-strip on macOS. Apparently,
llvm-strip/llvm-objcopy can't clean symbols from Mach-O nlists.
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This is an ongoing series of commits that are reformatting our Python
code. Reformatting is done with `black` (23.1.0).
If you end up having problems merging this commit because you have made
changes to a python file, the best way to handle that is to run `git
checkout --ours <yourfile>` and then reformat it with black.
RFC: https://discourse.llvm.org/t/rfc-document-and-standardize-python-code-style
Differential revision: https://reviews.llvm.org/D151460
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- Separate the two test and only have TestSymbolFileJSON rely on strip.
- Use different file names to make sure LLDB reloads the module.
This should address all the post commit review from D148062.
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