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Refactor: Remove unused features and functions, and move most allocator operations to a global namespace. (#750)

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* 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 commit is contained in:
Matthew Parkinson
2025-02-22 19:53:27 +00:00
committed by GitHub
parent 6d50141e35
commit 5f7baef755
50 changed files with 818 additions and 1403 deletions
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6
docs/release/0.7/README.md
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@@ -109,10 +109,10 @@ The additional meta-data size in snmalloc 0.6 was fixed and under a cache line i
In snmalloc 0.7, we have made this meta-data size configurable.
This allows developers to build new security features on top of snmalloc.
For instance, building snmalloc with the following definition of `Alloc` will allow you to store a 64-bit counter for each allocation:
For instance, building snmalloc with the following definition of `Config` will allow you to store a 64-bit counter for each allocation:
```cpp
using Alloc = snmalloc::LocalAllocator<snmalloc::StandardConfigClientMeta<
ArrayClientMetaDataProvider<std::atomic<size_t>>>>;
using Config = snmalloc::StandardConfigClientMeta<
ArrayClientMetaDataProvider<std::atomic<size_t>>>;
```
This does not affect the underlying alignment of the allocations.