--- libmalloc/libmalloc-374.120.1/src/thresholds.h
+++ /dev/null
@@ -1,229 +0,0 @@
-/*
- * Copyright (c) 2015 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#ifndef __THRESHOLDS_H
-#define __THRESHOLDS_H
-
-/*
- * The actual threshold boundaries between allocators. These boundaries are
- * where the next allocator will take over and they are *inclusive* of the
- * limit value.  That is, a TINY limit of X implies that an X-byte
- * allocation will come from TINY.
- *
- * The LARGE allocator cuts in at whatever the last boundary limit is. So, when
- * the medium allocator is compiled out, or not engaged, then large starts at
- * the limit of SMALL.
- */
-#if MALLOC_TARGET_64BIT
-#define TINY_LIMIT_THRESHOLD (1008)
-#else // MALLOC_TARGET_64BIT
-#define TINY_LIMIT_THRESHOLD (496)
-#endif // MALLOC_TARGET_64BIT
-
-#if MALLOC_TARGET_IOS
-#define SMALL_LIMIT_THRESHOLD (15 * 1024)
-#else // MALLOC_TARGET_IOS
-#define SMALL_LIMIT_THRESHOLD (32 * 1024)
-#endif // MALLOC_TARGET_IOS
-#define MEDIUM_LIMIT_THRESHOLD (8 * 1024 * 1024)
-
-/*
- * Tiny region size definitions; these are split into quanta of 16 bytes,
- * 64504 blocks is the magical value of how many quanta we can fit in a 1mb
- * region including the region trailer and metadata.
- */
-#define SHIFT_TINY_QUANTUM 4ull
-#define SHIFT_TINY_CEIL_BLOCKS 16 // ceil(log2(NUM_TINY_BLOCKS))
-#define TINY_QUANTUM (1 << SHIFT_TINY_QUANTUM)
-#define NUM_TINY_BLOCKS 64504
-#define NUM_TINY_CEIL_BLOCKS (1 << SHIFT_TINY_CEIL_BLOCKS)
-#define NUM_TINY_SLOTS (TINY_LIMIT_THRESHOLD >> SHIFT_TINY_QUANTUM)
-
-#if MALLOC_TARGET_64BIT
-#define TINY_BITMAP_RANGE_LIMIT 63
-#else
-#define TINY_BITMAP_RANGE_LIMIT 31
-#endif
-
-/*
- * Small region size definitions.
- *
- * We can only represent up to 1<<15 for msize; but we choose to stay
- * even below that to avoid the convention msize=0 => msize = (1<<15)
- */
-#define SHIFT_SMALL_QUANTUM (SHIFT_TINY_QUANTUM + 5) // 9
-#define SHIFT_SMALL_CEIL_BLOCKS 14 // ceil(log2(NUM_SMALL_BLOCKs))
-#define SMALL_QUANTUM (1 << SHIFT_SMALL_QUANTUM) // 512 bytes
-#define SMALL_BLOCKS_ALIGN (SHIFT_SMALL_CEIL_BLOCKS + SHIFT_SMALL_QUANTUM) // 23
-#define NUM_SMALL_BLOCKS 16319
-#define NUM_SMALL_CEIL_BLOCKS (1 << SHIFT_SMALL_CEIL_BLOCKS)
-#define NUM_SMALL_SLOTS (SMALL_LIMIT_THRESHOLD >> SHIFT_SMALL_QUANTUM)
-
-/*
- * Medium region size definitions.
- *
- * We can only represent up to 1<<15 for msize; but we choose to stay
- * even below that to avoid the convention msize=0 => msize = (1<<15)
- */
-#define SHIFT_MEDIUM_QUANTUM (SHIFT_SMALL_QUANTUM + 6) // 15
-#define SHIFT_MEDIUM_CEIL_BLOCKS 12ull // ceil(log2(NUM_MEDIUM_BLOCKS))
-#define MEDIUM_QUANTUM ((uint64_t)(1 << SHIFT_MEDIUM_QUANTUM)) // 32kbytes
-#define MEDIUM_BLOCKS_ALIGN (SHIFT_MEDIUM_CEIL_BLOCKS + SHIFT_MEDIUM_QUANTUM) // 27
-#define NUM_MEDIUM_BLOCKS 4095
-#define NUM_MEDIUM_CEIL_BLOCKS (1ull << SHIFT_MEDIUM_CEIL_BLOCKS)
-#define NUM_MEDIUM_SLOTS (MEDIUM_LIMIT_THRESHOLD >> SHIFT_MEDIUM_QUANTUM)
-#define MEDIUM_ACTIVATION_THRESHOLD (32ull * 1024 * 1024 * 1024)
-#define MEDIUM_CONDITIONAL_MADVISE_LIMIT (2 * 1024 * 1024)
-#define MEDIUM_MADVISE_SHIFT 4
-#define MEDIUM_MADVISE_MIN ((3 * 1024 * 1024) / 2) // 1.5 megabytes
-#define MEDIUM_MADVISE_DRAM_SCALE_DIVISOR (128ull * 1024 * 1024 * 1024) // 128GB
-
-/*
- * When performing a realloc() that must fallback to creating a new allocation
- * and copying the previous contents to the new allocation, vm_copy is used if
- * the allocation is greater than a given size.
- *
- * This threshold must be set such that all eligible allocations would have
- * come from a page-sized, page-aligned allocator (so, medium or large).
- *
- * Note: iOS disables this threshold because the VM forces non-sharing from
- * malloc-tagged allocations.
- */
-#define VM_COPY_THRESHOLD (2 * 1024 * 1024)
-
-/*
- * <rdar://problem/6881926&27190324> Extremely old versions of Microsoft Word
- * (and, subsequently, versions of Adobe apps) required the Leopard behaviour
- * where LARGE allocations were zero-filled prior to returning them to the
- * caller.
- *
- * We've always used LARGE_THRESHOLD to denote this boundary but as we keep
- * moving it around it's better to fix it at the point it was originally.
- */
-#define LEGACY_ZEROING_THRESHOLD (127 * 1024)
-
-/*
- * Large entry cache (death row) sizes. The large cache is bounded with
- * an overall top limit size, each entry is allowed a given slice of
- * that limit.
- */
-
-#define LARGE_CACHE_EXPANDED_THRESHOLD (32ull * 1024 * 1024 * 1024)
-
-#if MALLOC_TARGET_64BIT
-#define LARGE_ENTRY_CACHE_SIZE_HIGH 64
-#define LARGE_ENTRY_SIZE_ENTRY_LIMIT_HIGH (512 * 1024 * 1024)
-// lowmem config
-#define LARGE_ENTRY_CACHE_SIZE_LOW 16
-#define LARGE_ENTRY_SIZE_ENTRY_LIMIT_LOW (128 * 1024 * 1024)
-#else // MALLOC_TARGET_64BIT
-#define LARGE_ENTRY_CACHE_SIZE_HIGH 8
-#define LARGE_ENTRY_SIZE_ENTRY_LIMIT_HIGH (32 * 1024 * 1024)
-// lowmem config same as "highmem"
-#define LARGE_ENTRY_CACHE_SIZE_LOW LARGE_ENTRY_CACHE_SIZE_HIGH
-#define LARGE_ENTRY_SIZE_ENTRY_LIMIT_LOW LARGE_ENTRY_SIZE_ENTRY_LIMIT_HIGH
-#endif // MALLOC_TARGET_64BIT
-
-/*
- * Large entry cache (death row) "flotsam" limits. Until the large cache
- * contains at least "high" bytes, the cache is not cleaned under memory
- * pressure. After that, memory pressure notifications cause cache cleaning
- * until the large cache drops below the "low" limit.
- */
-#define SZONE_FLOTSAM_THRESHOLD_LOW (1024 * 512)
-#define SZONE_FLOTSAM_THRESHOLD_HIGH (1024 * 1024)
-
-/*
- * The magazine freelist array must be large enough to accomodate the allocation
- * granularity of the tiny, small and medium allocators. In addition, the last
- * slot in the list is special and reserved for coalesced regions bigger than
- * the overall max allocation size of the allocator.
- */
-#define MAGAZINE_FREELIST_SLOTS (NUM_MEDIUM_SLOTS + 1)
-#define MAGAZINE_FREELIST_BITMAP_WORDS ((MAGAZINE_FREELIST_SLOTS + 31) >> 5)
-
-/*
- * Density threshold used in determining the level of emptiness before
- * moving regions to the recirc depot.
- */
-#define DENSITY_THRESHOLD(a) \
-	((a) - ((a) >> 2)) // "Emptiness" f = 0.25, so "Density" is (1 - f)*a. Generally: ((a) - ((a) >> -log2(f)))
-
-/*
- * Minimum number of regions to retain in a recirc depot.
- */
-#define DEFAULT_RECIRC_RETAINED_REGIONS 2
-
-/* Sanity checks. */
-
-// Tiny performs an ffsl of a uint64_t in order to determine how big an
-// allocation is. Therefore, the total allocation size of small cannot exceed
-// 63-bits worth of 16-byte quanta (64-bits but minus one for the start of the
-// allocation itself).
-MALLOC_STATIC_ASSERT((TINY_LIMIT_THRESHOLD / TINY_QUANTUM) <= TINY_BITMAP_RANGE_LIMIT,
-		"TINY_LIMIT_THRESHOLD cannot exceed TINY_BITMAP_RANGE_LIMIT-bits worth of metadata");
-
-// Check that the given threshold limits are a round multiple of their
-// allocator's quantum size.
-MALLOC_STATIC_ASSERT((TINY_LIMIT_THRESHOLD % TINY_QUANTUM) == 0,
-		"TINY_LIMIT_THRESHOLD must be a multiple of TINY_QUANTUM");
-
-MALLOC_STATIC_ASSERT((SMALL_LIMIT_THRESHOLD % SMALL_QUANTUM) == 0,
-		"SMALL_LIMIT_THRESHOLD must be a multiple of SMALL_QUANTUM");
-
-MALLOC_STATIC_ASSERT((MEDIUM_LIMIT_THRESHOLD % MEDIUM_QUANTUM) == 0,
-		"MEDIUM_LIMIT_THRESHOLD must be a multiple of MEDIUM_QUANTUM");
-
-// All the "slot" counts are calculated as a shift of thresholds now but
-// in-case someone decides to try hand-crafted values, make sure they adhere to
-// the basic expectation that slot count must account for all valid sizes of
-// allocations.
-MALLOC_STATIC_ASSERT(NUM_TINY_SLOTS >= TINY_LIMIT_THRESHOLD >> SHIFT_TINY_QUANTUM,
-		"NUM_TINY_SLOTS must allow a free list for every valid TINY allocation");
-
-MALLOC_STATIC_ASSERT(NUM_SMALL_SLOTS >= SMALL_LIMIT_THRESHOLD >> SHIFT_SMALL_QUANTUM,
-		"NUM_SMALL_SLOTS must allow a free list for every valid SMALL allocation");
-
-MALLOC_STATIC_ASSERT(NUM_MEDIUM_SLOTS >= MEDIUM_LIMIT_THRESHOLD >> SHIFT_MEDIUM_QUANTUM,
-		"NUM_MEDIUM_SLOTS must allow a free list for every valid MEDIUM allocation");
-
-// MAGAZINE_FREELIST_SLOTS cannot be dynamically selected by the MAX() of all
-// three allocators, so it must match (at least) the maxmium slot count of the
-// allocator with the largest range.
-//
-// Additionally, each allocator assumes that there is one additional free-list
-// slot above their maximum allocation size. This allows each allocator to
-// store an unordered list of maximally-sized free list entries.
-MALLOC_STATIC_ASSERT(NUM_TINY_SLOTS < MAGAZINE_FREELIST_SLOTS,
-		"NUM_TINY_SLOTS must be less than MAGAZINE_FREELIST_SLOTS");
-
-MALLOC_STATIC_ASSERT(NUM_SMALL_SLOTS < MAGAZINE_FREELIST_SLOTS,
-		"NUM_SMALL_SLOTS must be less than MAGAZINE_FREELIST_SLOTS");
-
-MALLOC_STATIC_ASSERT(NUM_MEDIUM_SLOTS < MAGAZINE_FREELIST_SLOTS,
-		"NUM_MEDIUM_SLOTS must be less than MAGAZINE_FREELIST_SLOTS");
-
-MALLOC_STATIC_ASSERT(VM_COPY_THRESHOLD >= SMALL_LIMIT_THRESHOLD,
-		"VM_COPY_THRESHOLD must be larger than SMALL_LIMIT_THRESHOLD");
-
-#endif // __THRESHOLDS_H