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[msan] Update Use-after-destruction documentation

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Reviewed By: kda, eugenis

Differential Revision: https://reviews.llvm.org/D124058
This commit is contained in:
Vitaly Buka 2022-04-19 18:42:17 -07:00
parent 311929267d
commit b580c0e019
1 changed files with 7 additions and 8 deletions
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clang/docs/MemorySanitizer.rst
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@ -162,17 +162,16 @@ not intermediate stores.
Use-after-destruction detection
===============================
You can enable experimental use-after-destruction detection in MemorySanitizer.
After invocation of the destructor, the object will be considered no longer
readable, and using underlying memory will lead to error reports in runtime.
Refer to the standard for `lifetime <https://eel.is/c++draft/basic.life#1>`_ definition.
MemorySanitizer includes use-after-destruction detection. After invocation of
the destructor, the object will be considered no longer readable, and using
underlying memory will lead to error reports in runtime. Refer to the standard
for `lifetime <https://eel.is/c++draft/basic.life#1>`_ definition.
This feature is still experimental, in order to enable it at runtime you need
to:
This feature can be disabled with either:
#. Pass addition Clang option ``-fsanitize-memory-use-after-dtor`` during
#. Pass addition Clang option ``-fno-sanitize-memory-use-after-dtor`` during
compilation.
#. Set environment variable `MSAN_OPTIONS=poison_in_dtor=1` before running
#. Set environment variable `MSAN_OPTIONS=poison_in_dtor=0` before running
the program.
Handling external code