[llvm-dis] Update header comment to reflect current command-line options #1
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- Updated the header comment in llvm-dis.cpp to accurately reflect
the current available command-line options and positional arguments.
- Added details for:
- Short options: -o, -f.
- Long options: --disable-output, --set-importing, --show-annotations,
--preserve-ll-uselistorder, --materialize-metadata, --print-thinlto-index-only.
- Ensured hidden options are excluded from the header.
|
Duplicate of llvm#108073 |
MainakSil
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Sep 16, 2024
When SPARC Asan testing is enabled by PR llvm#107405, many Linux/sparc64 tests just hang like ``` #0 0xf7ae8e90 in syscall () from /usr/lib32/libc.so.6 #1 0x701065e8 in __sanitizer::FutexWait(__sanitizer::atomic_uint32_t*, unsigned int) () at compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp:766 #2 0x70107c90 in Wait () at compiler-rt/lib/sanitizer_common/sanitizer_mutex.cpp:35 #3 0x700f7cac in Lock () at compiler-rt/lib/asan/../sanitizer_common/sanitizer_mutex.h:196 llvm#4 Lock () at compiler-rt/lib/asan/../sanitizer_common/sanitizer_thread_registry.h:98 llvm#5 LockThreads () at compiler-rt/lib/asan/asan_thread.cpp:489 llvm#6 0x700e9c8c in __asan::BeforeFork() () at compiler-rt/lib/asan/asan_posix.cpp:157 llvm#7 0xf7ac83f4 in ?? () from /usr/lib32/libc.so.6 Backtrace stopped: previous frame identical to this frame (corrupt stack?) ``` It turns out that this happens in tests using `internal_fork` (e.g. invoking `llvm-symbolizer`): unlike most other Linux targets, which use `clone`, Linux/sparc64 has to use `__fork` instead. While `clone` doesn't trigger `pthread_atfork` handlers, `__fork` obviously does, causing the hang. To avoid this, this patch disables `InstallAtForkHandler` and lets the ASan tests run to completion. Tested on `sparc64-unknown-linux-gnu`.
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Summary:
This PR updates the header comment in
llvm-dis.cppto accurately reflect the current command-line options and positional arguments supported byllvm-dis. The original comment was outdated and only mentioned the--helpoption, whereas several additional options have been introduced.Changes Made:
-o,-f.--disable-output,--set-importing,--show-annotations,--preserve-ll-uselistorder,--materialize-metadata,--print-thinlto-index-only.Testing:
This change only affects comments in the source code and does not impact the functionality of the tool itself. The tool has been tested to verify that no functionality is affected by this update.
Issue Reference:
This PR resolves issue llvm#108069.