While running into failures on unmap calls, it becomes difficult to
figure out what's wrong. Break the dieOnMapUnmapError into specific
versions for map, unmap, and then one for mprotect.
Also, put these in a common linux space so that all linux derived code
can reuse this code.
We used to update the deallocated block with
atomic_compare_exchange_strong to ensure the concurrent double-free will
be detected. However, this operation incurs huge performance overhead
which takes over 50% execution time in deallocate(). Given that we
already have the checksum to guard the most double-free cases and other
block verifications in the primary allocator, use atomic-store instead.
The RSS code is not very useful and can be replicated by using
ulimit. Remove it and remove the options associated with it.
Reviewed By: Chia-hungDuan
Differential Revision: https://reviews.llvm.org/D159155
The ScopedString class has two functions named append. One takes
a va_list, but on some platforms va_list is typedef'd to char*.
That means that this call:
std::string value;
Str.append("print this string %s", value.c_str());
The compiler can incorrectly think this is the va_list function,
leading to crashes when calling this. To fix this, change the name
of the va_list function to be vappend to avoid this.
Fix https://github.com/llvm/llvm-project/issues/62893
Reviewed By: Chia-hungDuan
Differential Revision: https://reviews.llvm.org/D153389
Because of lock contention, we temporarily disabled the printing of
regions' status when it's exhausted. Given that it's useful when the
Region OOM happens, this CL brings it back without lock contention.
Differential Revision: https://reviews.llvm.org/D141955
Some platforms (eg: Trusty) are extremelly memory constrained, which
doesn't necessarily work well with some of Scudo's current assumptions.
`Vector` by default (and as such `String` and `ScopedString`) maps a
page, which is a bit of a waste. This CL changes `Vector` to use a
buffer local to the class first, then potentially map more memory if
needed (`ScopedString` currently are all stack based so it would be
stack data). We also want to allow a platform to prevent any dynamic
resizing, so I added a `CanGrow` templated parameter that for now is
always `true` but would be set to `false` on Trusty.
Differential Revision: https://reviews.llvm.org/D103641
Cast of signed types to u64 breaks comparison.
Also remove double () around operands.
Reviewed By: cryptoad, hctim
Differential Revision: https://reviews.llvm.org/D103060
The macros INLINE and COMPILER_CHECK always expand to the same thing (inline
and static_assert respectively). Both expansions are standards compliant C++
and are used consistently in the rest of LLVM, so let's improve consistency
with the rest of LLVM by replacing them with the expansions.
Differential Revision: https://reviews.llvm.org/D70793
