46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
// Copyright 2021 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ALLOCATOR_EARLY_ZONE_REGISTRATION_MAC_H_
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#define BASE_ALLOCATOR_EARLY_ZONE_REGISTRATION_MAC_H_
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// This is an Apple-only file, used to register PartitionAlloc's zone *before*
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// the process becomes multi-threaded.
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namespace partition_alloc {
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static constexpr char kDelegatingZoneName[] =
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"DelegatingDefaultZoneForPartitionAlloc";
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static constexpr char kPartitionAllocZoneName[] = "PartitionAlloc";
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// Zone version. Determines which callbacks are set in the various malloc_zone_t
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// structs.
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#if (__MAC_OS_X_VERSION_MAX_ALLOWED >= 130000) || \
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(__IPHONE_OS_VERSION_MAX_ALLOWED >= 160100)
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#define PA_TRY_FREE_DEFAULT_IS_AVAILABLE 1
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#endif
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#if PA_TRY_FREE_DEFAULT_IS_AVAILABLE
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constexpr int kZoneVersion = 13;
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#else
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constexpr int kZoneVersion = 9;
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#endif
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// Must be called *once*, *before* the process becomes multi-threaded.
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void EarlyMallocZoneRegistration();
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// Tricks the registration code to believe that PartitionAlloc was not already
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// registered. This allows a future library load to register PartitionAlloc's
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// zone as well, rather than bailing out.
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//
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// This is mutually exclusive with EarlyMallocZoneRegistation(), and should
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// ideally be removed. Indeed, by allowing two zones to be registered, we still
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// end up with a split heap, and more memory usage.
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//
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// This is a hack for crbug.com/1274236.
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void AllowDoublePartitionAllocZoneRegistration();
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} // namespace partition_alloc
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#endif // BASE_ALLOCATOR_EARLY_ZONE_REGISTRATION_H_
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