[all-commits] [llvm/llvm-project] 3eebeb: [libc] Add aligned_alloc (#96586)

[PiJoules via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3eebeb7e50c49ece2788ff4d5ffab5cc6c3da455
      https://github.com/llvm/llvm-project/commit/3eebeb7e50c49ece2788ff4d5ffab5cc6c3da455
  Author: PiJoules <6019989+PiJoules at users.noreply.github.com>
  Date:   2024-07-03 (Wed, 03 Jul 2024)

  Changed paths:
    M libc/src/__support/block.h
    M libc/src/__support/freelist.h
    M libc/src/__support/freelist_heap.h
    A libc/src/stdlib/aligned_alloc.h
    M libc/src/stdlib/freelist_malloc.cpp
    M libc/test/src/__support/CMakeLists.txt
    M libc/test/src/__support/block_test.cpp
    M libc/test/src/__support/freelist_heap_test.cpp
    M libc/test/src/__support/freelist_malloc_test.cpp

  Log Message:
  -----------
  [libc] Add aligned_alloc (#96586)

This adds support for aligned_alloc with the freelist allocator. This
works by finding blocks large enough to hold the requested size plus
some shift amount that's at most the requested alignment. Blocks that
meet this requirement but aren't properly aligned can be split such that
the usable_space of a new block is aligned properly. The "padding" block
created will be merged with the previous block if one exists.



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