[libc-commits] [libc] [libc][malloc] Ensure a minimum block alignment of 4 (PR #169447)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- libc/fuzzing/__support/freelist_heap_fuzz.cpp libc/src/__support/block.h libc/src/__support/freelist_heap.h libc/src/__support/freestore.h libc/test/src/__support/block_test.cpp libc/test/src/__support/freelist_heap_test.cpp libc/test/src/__support/freestore_test.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libc/src/__support/block.h b/libc/src/__support/block.h
index 1f0566259..d45af1079 100644
--- a/libc/src/__support/block.h
+++ b/libc/src/__support/block.h
@@ -310,13 +310,15 @@ public:
   static BlockInfo allocate(Block *block, size_t alignment, size_t size);
 
   // These two functions may wrap around.
-  LIBC_INLINE static uintptr_t next_possible_block_start(
-      uintptr_t ptr, size_t usable_space_alignment = MIN_ALIGN) {
+  LIBC_INLINE static uintptr_t
+  next_possible_block_start(uintptr_t ptr,
+                            size_t usable_space_alignment = MIN_ALIGN) {
     return align_up(ptr + sizeof(Block), usable_space_alignment) -
            sizeof(Block);
   }
-  LIBC_INLINE static uintptr_t prev_possible_block_start(
-      uintptr_t ptr, size_t usable_space_alignment = MIN_ALIGN) {
+  LIBC_INLINE static uintptr_t
+  prev_possible_block_start(uintptr_t ptr,
+                            size_t usable_space_alignment = MIN_ALIGN) {
     return align_down(ptr, usable_space_alignment) - sizeof(Block);
   }
 

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https://github.com/llvm/llvm-project/pull/169447