[PATCH] D63231: [scudo][standalone] Introduce the combined allocator

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad created this revision.
cryptoad added reviewers: morehouse, hctim, eugenis, vitalybuka.
Herald added subscribers: Sanitizers, jfb, delcypher, mgorny, srhines.
Herald added projects: LLVM, Sanitizers.

The Combined allocator hold together all the other components, and
provides a memory allocator interface based on various template
parameters. This will be in turn used by "wrappers" that will provide
the standard C and C++ memory allocation functions, but can be
used as is as well.

This doesn't depart significantly from the current Scudo implementation
except for a few details:

- Quarantine batches are now protected by a header a well;
- an Allocator instance has its own TSD registry, as opposed to a static one for everybody;
- a function to iterate over busy chunks has been added, for Android purposes;

This also adds the associated tests, and a few default configurations
for several platforms, that will likely be further tuned later on.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D63231

Files:
  lib/scudo/standalone/CMakeLists.txt
  lib/scudo/standalone/allocator.h
  lib/scudo/standalone/combined.h
  lib/scudo/standalone/tests/CMakeLists.txt
  lib/scudo/standalone/tests/combined_test.cc

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