D28596 added SANITIZER_INTERFACE_WEAK_DEF which can guarantee `*_default_options` are always defined.
The weak attributes on the `__{asan,lsan,msan,ubsan}_default_options` declarations can thus be removed.
`MaybeCall*DefaultOptions` no longer need nullptr checks, so their call sites can just be replaced by `__*_default_options`.
Reviewed By: #sanitizers, vitalybuka
Differential Revision: https://reviews.llvm.org/D87175
Add functions exposed via the MSAN interface to enable MSAN within
binaries that perform manual stack switching (e.g. through using fibers
or coroutines).
This functionality is analogous to the fiber APIs available for ASAN and TSAN.
Fixesgoogle/sanitizers#1232
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D86471
The former function is particularly optimized for exactly the
use case we're interested in: an all-zero buffer.
This reduces the overhead of calling this function some 80% or
more. This is particularly for instrumenting code heavy with
string processing functions, like grep. An invocation of grep
with the pattern '[aeiou]k[aeiou]' has its runtime reduced by
~75% with this patch
Differential Revision: https://reviews.llvm.org/D84961
Summary:
Normally, the Origin is passed over TLS, which seems like it introduces unnecessary overhead. It's in the (extremely) cold path though, so the only overhead is in code size.
But with eager-checks, calls to __msan_warning functions are extremely common, so this becomes a useful optimization.
This can save ~5% code size.
Reviewers: eugenis, vitalybuka
Reviewed By: eugenis, vitalybuka
Subscribers: hiraditya, #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D81700
Summary:
Previously it wasn't obvious what the default value of various sanitizer
options were. A very close approximation of the "default values" for the
options are the current value of the options at the time of printing the
help output.
In the case that no other options are provided then the current values
are the default values (apart from `help`).
```
ASAN_OPTIONS=help=1 ./program
```
This patch causes the current option values to be printed when the
`help` output is enabled. The original intention for this patch was to append
`(Default: <value>)` to an option's help text. However because this
is technically wrong (and misleading) I've opted to append
`(Current Value: <value>)` instead.
When trying to implement a way of displaying the default value of the
options I tried another solution where the default value used in `*.inc` files
were used to create compile time strings that where used when printing
the help output. This solution was not satisfactory for several reasons:
* Stringifying the default values with the preprocessor did not work very
well in several cases. Some options contain boolean operators which no
amount of macro expansion can get rid of.
* It was much more invasive than this patch. Every sanitizer had to be changed.
* The settings of `__<sanitizer>_default_options()` are ignored.
For those reasons I opted for the solution in this patch.
rdar://problem/42567204
Reviewers: kubamracek, yln, kcc, dvyukov, vitalybuka, cryptoad, eugenis, samsonov
Subscribers: #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D69546
- Especially MemorySanitizer fails if those sysctl configs are enabled.
Reviewers: vitalybuka, emaste, dim
Reviewed By: dim
Differential Revision: https://reviews.llvm.org/D66582
llvm-svn: 369708
Vitaly Buka