The new operator in the snmalloc did not throw exceptions in the case of
allocation failure. Moreover, it was not possible to override the
behaviour of the failure of the new operator using the
std::set_new_handler function.
This PR adds the necessary code to the snmalloc new operator to
throw std::bad_alloc when the allocation fails. It also allows the
std::set_new_handler function to be used to set a custom handler for
allocation failures.
* Factor out explicit Config type
Instead of using snmalloc::Alloc::Config, expose snmalloc::Config, which is then used to derive the allocator type.
* Move globalalloc to front end.
* Remove unneed template parameter from global snmalloc functions.
* Remove SNMALLOC_PASS_THROUGH
VeronaRT now has an abstraction layer which can easily replace the allocator.
Having such a complex integration still in snmalloc does not make sense.
* Take some global functions off of local alloc.
* Drop comparison overloads on atomic Capptr.
Performing a comparison on two atomic ptr is a complex operation, and should not be implicit. The memory model order and such things needs to be considered by the caller.
* Remove function_ref and use templates
The implementation prefers to use templates over the function_ref. This now only exists in the Pal for a currently unused feature.
* Removing function_ref reduces stl needs.
* Remove use of __is_convertible to support older g++
* Inline function that is only used once.
* Remove unused function
* Restrict ThreadAlloc usage to globalalloc
This commit introduces various inline functions on snmalloc:: that perform allocation/deallocation using the thread local allocator.
They remove all usage from a particular test.
* Move cheri checks to own file.
* Refactor is_owned checks.
* Move alloc_size and check_size to globalalloc.
* Minor simplification of dealloc path
* Fix up is_owned to take a config
* Improve usage of scoped allocator.
* Handle Config_ in globalalloc.
This provide a way to configure snmalloc to provide per object meta-data that is out of band. This can be used to provide different mitigations on top of snmalloc, such as storing memory tags in a compressed form, or provide a miracle pointer like feature.
This also includes a couple of TSAN fixes as it wasn't fully on in CI.
