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70c9b7ef2c
I was running into issues where these names would conflict with the type's own Get/Set methods and these names have the added benefit of indicating a bit more that atomic stuff is going on. Differential Revision: https://phabricator.services.mozilla.com/D99268
464 lines
21 KiB
C++
464 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_AtomicBitfields_h
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#define mozilla_AtomicBitfields_h
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#include "mozilla/Assertions.h"
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#include "mozilla/MacroArgs.h"
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#include "mozilla/MacroForEach.h"
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#include <atomic>
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#include <limits>
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#include <stdint.h>
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#include <type_traits>
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namespace mozilla {
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// Creates a series of atomic bitfields.
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//
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// |aBitfields| is the name of the underlying storage for the bitfields.
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// |aBitFieldsSize| is the size of the underlying storage (8, 16, 32, or 64).
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//
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// Bitfields are specified as a triplet of (type, name, size), which mirrors
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// the way you declare native C++ bitfields (bool mMyField1: 1). Trailing
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// commas are not supported in the list of bitfields.
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//
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// Signed integer types are not supported by this Macro to avoid dealing with
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// packing/unpacking the sign bit and C++'s general messiness around signed
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// integer representations not being fully defined.
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//
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// You cannot request a single field that's the
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// size of the the entire bitfield storage. Just use a normal atomic integer!
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//
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//
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// ========================== SEMANTICS AND SAFETY ============================
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//
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// All fields are default-initialized to 0.
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//
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// In debug builds, storing a value to a bitfield that's larger than its bits
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// can fit will trigger an assertion. In release builds, the value will just be
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// masked off.
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//
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// If you request anything unsupported by this macro it should result in
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// a compile-time error (either a static assert or just weird macro errors).
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// For instance, this macro will statically prevent using more bits than
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// |aBitFieldsSize|, so specifying the size is just to prevent accidentally
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// making the storage bigger.
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//
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// Each field will get a Load$NAME and Store$Name method which will atomically
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// load and store the requested value with a Sequentially Consistent memory
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// order (to be on the safe side). Storing a field requires a compare-exchange,
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// so a thread may get stalled if there's a lot of contention on the bitfields.
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//
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//
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// ============================== MOTIVATION ==================================
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//
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// You might be wondering: why would I need atomic bitfields? Well as it turns
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// out, bitfields and concurrency mess a lot of people up!
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//
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// CPUs don't have operations to write to a handful of bits -- they generally
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// only have the precision of a byte. So when you use C++'s native bitfields,
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// the compiler generates code to mask and shift the values in for you. This
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// means writing to a single field will actually overwrite all the other
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// bitfields that are packed in with it!
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//
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// In single-threaded code this is fine; the old values are loaded and written
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// back by the compiler's generated code. But in concurrent code, it means
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// that accessing two different fields can be an unexpected Data Race (which is
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// Undefined Behavior!).
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//
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// By using MOZ_ATOMIC_BITFIELDS, you protect yourself from these Data Races,
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// and don't have to worry about writes getting lost.
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//
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//
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// ================================ EXAMPLE ===================================
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//
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// #include "mozilla/AtomicBitfields.h"
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// #include <stdint.h>
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//
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//
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// struct MyType {
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// MOZ_ATOMIC_BITFIELDS(mAtomicFields, 8, (
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// (bool, IsDownloaded, 1),
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// (uint32_t, SomeData, 2),
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// (uint8_t, OtherData, 5)
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// ))
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//
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// int32_t aNormalInteger;
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//
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// explicit MyType(uint32_t aSomeData): aNormalInteger(7) {
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// StoreSomeData(aSomeData);
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// // Other bitfields were already default initialized to 0/false
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// }
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// };
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//
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//
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// int main() {
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// MyType val(3);
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//
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// if (!val.LoadIsDownloaded()) {
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// val.StoreOtherData(2);
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// val.StoreIsDownloaded(true);
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// }
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// }
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//
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//
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// ============================== GENERATED ===================================
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//
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// This macro is a real mess to read because, well, it's a macro. So for the
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// sake of anyone who has to review or modify its internals, here's a rough
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// sketch of what the above example would expand to:
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//
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// struct MyType {
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// // The actual storage of the bitfields, initialized to 0.
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// std::atomic_uint8_t mAtomicFields{0};
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//
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// // How many bits were actually used (in this case, all of them).
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// static const size_t mAtomicFields_USED_BITS = 8;
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//
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// // The offset values for each field.
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// static const size_t mAtomicFieldsIsDownloaded = 0;
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// static const size_t mAtomicFieldsSomeData = 1;
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// static const size_t mAtomicFieldsOtherData = 3;
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//
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// // Quick safety guard to prevent capacity overflow.
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// static_assert(mAtomicFields_USED_BITS <= 8);
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//
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// // Asserts that fields are reasonable.
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// static_assert(8>1, "mAtomicFields: MOZ_ATOMIC_BITFIELDS field too big");
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// static_assert(std::is_unsigned<bool>(), "mAtomicFields:
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// MOZ_ATOMIC_BITFIELDS doesn't support signed payloads");
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// // ...and so on
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//
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// // Load/Store methods for all the fields.
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//
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// bool LoadIsDownloaded() { ... }
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// void StoreIsDownloaded(bool aValue) { ... }
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//
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// uint32_t LoadSomeData() { ... }
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// void StoreSomeData(uint32_t aValue) { ... }
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//
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// uint8_t LoadOtherData() { ... }
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// void StoreOtherData(uint8_t aValue) { ... }
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//
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//
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// // Remainder of the struct body continues normally.
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// int32_t aNormalInteger;
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// explicit MyType(uint32_t aSomeData): aNormalInteger(7) {
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// StoreSomeData(aSomeData);
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// // Other bitfields were already default initialized to 0/false.
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// }
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// }
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//
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// Also if you're wondering why there's so many MOZ_CONCAT's -- it's because
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// the preprocessor sometimes gets confused if we use ## on certain arguments.
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// MOZ_CONCAT reliably kept the preprocessor happy, sorry it's so ugly!
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//
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//
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// ==================== FIXMES / FUTURE WORK ==================================
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//
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// * It would be nice if LoadField could be IsField for booleans.
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//
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// * For the case of setting something to all 1's or 0's, we can use
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// |fetch_or| or |fetch_and| instead of |compare_exchange_weak|. Is this
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// worth providing? (Possibly for 1-bit boolean fields?)
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//
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// * Try harder to hide the atomic/enum/array internals from
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// the outer struct?
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//
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#define MOZ_ATOMIC_BITFIELDS(aBitfields, aBitfieldsSize, aFields) \
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std::atomic_uint##aBitfieldsSize##_t aBitfields{0}; \
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\
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static const size_t MOZ_CONCAT(aBitfields, _USED_BITS) = \
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MOZ_FOR_EACH_SEPARATED(MOZ_ATOMIC_BITFIELDS_FIELD_SIZE, (+), (), \
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aFields); \
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\
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MOZ_ROLL_EACH(MOZ_ATOMIC_BITFIELDS_OFFSET_HELPER1, (aBitfields, ), aFields) \
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\
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static_assert(MOZ_CONCAT(aBitfields, _USED_BITS) <= aBitfieldsSize, \
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#aBitfields ": Maximum bits (" #aBitfieldsSize \
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") exceeded for MOZ_ATOMIC_BITFIELDS instance"); \
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\
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MOZ_FOR_EACH(MOZ_ATOMIC_BITFIELDS_FIELD_HELPER, \
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(aBitfields, aBitfieldsSize, ), aFields)
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// Just a helper to unpack the head of the list.
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#define MOZ_ATOMIC_BITFIELDS_OFFSET_HELPER1(aBitfields, aFields) \
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MOZ_ATOMIC_BITFIELDS_OFFSET_HELPER2(aBitfields, MOZ_ARG_1 aFields, aFields);
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// Just a helper to unpack the name and call the real function.
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#define MOZ_ATOMIC_BITFIELDS_OFFSET_HELPER2(aBitfields, aField, aFields) \
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MOZ_ATOMIC_BITFIELDS_OFFSET(aBitfields, MOZ_ARG_2 aField, aFields)
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// To compute the offset of a field, why sum up all the offsets after it
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// (inclusive) and subtract that from the total sum itself. We do this to swap
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// the rolling sum that |MOZ_ROLL_EACH| gets us from descending to ascending.
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#define MOZ_ATOMIC_BITFIELDS_OFFSET(aBitfields, aFieldName, aFields) \
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static const size_t MOZ_CONCAT(aBitfields, aFieldName) = \
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MOZ_CONCAT(aBitfields, _USED_BITS) - \
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(MOZ_FOR_EACH_SEPARATED(MOZ_ATOMIC_BITFIELDS_FIELD_SIZE, (+), (), \
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aFields));
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// Just a more clearly named way of unpacking the size.
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#define MOZ_ATOMIC_BITFIELDS_FIELD_SIZE(aArgs) MOZ_ARG_3 aArgs
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// Just a helper to unpack the tuple and call the real function.
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#define MOZ_ATOMIC_BITFIELDS_FIELD_HELPER(aBitfields, aBitfieldsSize, aArgs) \
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MOZ_ATOMIC_BITFIELDS_FIELD(aBitfields, aBitfieldsSize, MOZ_ARG_1 aArgs, \
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MOZ_ARG_2 aArgs, MOZ_ARG_3 aArgs)
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// We need to disable this with coverity because it doesn't like checking that
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// booleans are < 2 (because they always are).
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#ifdef __COVERITY__
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# define MOZ_ATOMIC_BITFIELDS_STORE_GUARD(aValue, aFieldSize)
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#else
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# define MOZ_ATOMIC_BITFIELDS_STORE_GUARD(aValue, aFieldSize) \
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MOZ_ASSERT(((uint64_t)aValue) < (1ull << aFieldSize), \
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"Stored value exceeded capacity of bitfield!")
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#endif
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// Generates the Load and Store methods for each field.
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//
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// Some comments here because inline macro comments are a pain in the neck:
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//
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// Most of the locals are forward declared to minimize messy macroified
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// type declaration. Also a lot of locals are used to try to make things
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// a little more clear, while also avoiding integer promotion issues.
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// This is why some locals are literally just copying a value we already have:
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// to force it to the right size.
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//
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// There's an annoying overflow case where a bitfields instance has a field
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// that is the same size as the bitfields. Rather than trying to handle that,
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// we just static_assert against it.
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//
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//
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// BITMATH EXPLAINED:
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//
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// For |Load$Name|:
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//
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// mask = ((1 << fieldSize) - 1) << offset
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//
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// If you subtract 1 from a value with 1 bit set you get all 1's below that bit.
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// This is perfect for ANDing out |fieldSize| bits. We shift by |offset| to get
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// it in the right place.
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//
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// value = (aBitfields.load() & mask) >> offset
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//
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// This sets every bit we're not interested in to 0. Shifting the result by
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// |offset| converts the value back to its native format, ready to be cast
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// up to an integer type.
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//
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//
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// For |Store$Name|:
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//
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// packedValue = (resizedValue << offset) & mask
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//
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// This converts a native value to the packed format. If the value is in bounds,
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// the AND will do nothing. If it's out of bounds (not checked in release),
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// then it will cause the value to wrap around by modulo 2^aFieldSize, just like
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// a normal uint.
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//
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// clearedValue = oldValue & ~mask;
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//
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// This clears the bits where our field is stored on our bitfield storage by
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// ANDing it with an inverted (NOTed) mask.
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//
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// newValue = clearedValue | packedValue;
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//
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// Once we have |packedValue| and |clearedValue| they just need to be ORed
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// together to merge the new field value with the old values of all the other
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// fields.
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//
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// This last step is done in a while loop because someone else can modify
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// the bits before we have a chance to. If we didn't guard against this,
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// our write would undo the write the other thread did. |compare_exchange_weak|
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// is specifically designed to handle this. We give it what we expect the
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// current value to be, and what we want it to be. If someone else modifies
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// the bitfields before us, then we will reload the value and try again.
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//
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// Note that |compare_exchange_weak| writes back the actual value to the
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// "expected" argument (it's passed by-reference), so we don't need to do
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// another load in the body of the loop when we fail to write our result.
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#define MOZ_ATOMIC_BITFIELDS_FIELD(aBitfields, aBitfieldsSize, aFieldType, \
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aFieldName, aFieldSize) \
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static_assert(aBitfieldsSize > aFieldSize, \
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#aBitfields ": MOZ_ATOMIC_BITFIELDS field too big"); \
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static_assert(std::is_unsigned<aFieldType>(), #aBitfields \
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": MOZ_ATOMIC_BITFIELDS doesn't support signed payloads"); \
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\
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aFieldType MOZ_CONCAT(Load, aFieldName)() const { \
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uint##aBitfieldsSize##_t fieldSize, mask, masked, value; \
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size_t offset = MOZ_CONCAT(aBitfields, aFieldName); \
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fieldSize = aFieldSize; \
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mask = ((1ull << fieldSize) - 1ull) << offset; \
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masked = aBitfields.load() & mask; \
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value = (masked >> offset); \
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return value; \
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} \
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\
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void MOZ_CONCAT(Store, aFieldName)(aFieldType aValue) { \
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MOZ_ATOMIC_BITFIELDS_STORE_GUARD(aValue, aFieldSize); \
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uint##aBitfieldsSize##_t fieldSize, mask, resizedValue, packedValue, \
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oldValue, clearedValue, newValue; \
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size_t offset = MOZ_CONCAT(aBitfields, aFieldName); \
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fieldSize = aFieldSize; \
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mask = ((1ull << fieldSize) - 1ull) << offset; \
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resizedValue = aValue; \
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packedValue = (resizedValue << offset) & mask; \
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oldValue = aBitfields.load(); \
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do { \
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clearedValue = oldValue & ~mask; \
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newValue = clearedValue | packedValue; \
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} while (!aBitfields.compare_exchange_weak(oldValue, newValue)); \
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}
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// OK SO THIS IS A GROSS HACK. GCC 10.2 (and below) has a bug[1] where it
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// doesn't allow a static array to reference itself in its initializer, so we
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// need to create a hacky way to produce a rolling sum of all the offsets.
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//
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// To do this, we make a tweaked version of |MOZ_FOR_EACH| which instead of
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// passing just one argument to |aMacro| it passes the remaining values of
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// |aArgs|.
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//
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// This allows us to expand an input (a, b, c, d) quadratically to:
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//
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// int sum1 = a + b + c + d;
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// int sum2 = b + c + d;
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// int sum3 = c + d;
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// int sum4 = d;
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//
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// So all of this is a copy-paste of |MOZ_FOR_EACH| except the definition
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// of |MOZ_FOR_EACH_HELPER| no longer extracts an argument with |MOZ_ARG_1|.
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// Also this is restricted to 32 arguments just to reduce footprint a little.
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//
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// If the GCC bug is ever fixed, then this hack can be removed, and we can
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// use the non-quadratic version that was originally written[2]. In case
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// that link dies, a brief summary of that implementation:
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//
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// * Associate each field with an index by creating an `enum class` with
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// entries for each field (an existing gecko patten).
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//
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// * Calculate offsets with a constexpr static array whose initializer
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// self-referentially adds the contents of the previous index to the
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// compute the current one.
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//
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// * Index into this array with the enum.
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//
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// [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97234
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// [2]: https://phabricator.services.mozilla.com/D91622?id=346499
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#define MOZ_ROLL_EACH_EXPAND_HELPER(...) __VA_ARGS__
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#define MOZ_ROLL_EACH_GLUE(a, b) a b
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#define MOZ_ROLL_EACH_SEPARATED(aMacro, aSeparator, aFixedArgs, aArgs) \
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MOZ_ROLL_EACH_GLUE(MOZ_PASTE_PREFIX_AND_ARG_COUNT( \
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MOZ_ROLL_EACH_, MOZ_ROLL_EACH_EXPAND_HELPER aArgs), \
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(aMacro, aSeparator, aFixedArgs, aArgs))
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#define MOZ_ROLL_EACH(aMacro, aFixedArgs, aArgs) \
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MOZ_ROLL_EACH_SEPARATED(aMacro, (), aFixedArgs, aArgs)
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#define MOZ_ROLL_EACH_HELPER_GLUE(a, b) a b
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#define MOZ_ROLL_EACH_HELPER(aMacro, aFixedArgs, aArgs) \
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MOZ_ROLL_EACH_HELPER_GLUE(aMacro, \
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(MOZ_ROLL_EACH_EXPAND_HELPER aFixedArgs aArgs))
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#define MOZ_ROLL_EACH_0(m, s, fa, a)
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#define MOZ_ROLL_EACH_1(m, s, fa, a) MOZ_ROLL_EACH_HELPER(m, fa, a)
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#define MOZ_ROLL_EACH_2(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_1(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_3(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_2(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_4(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_3(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_5(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_4(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_6(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_5(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_7(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_6(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_8(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_7(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_9(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_8(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_10(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_9(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_11(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_10(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_12(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_11(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_13(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_12(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_14(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_13(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_15(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_14(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_16(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_15(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_17(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_16(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_18(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_17(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_19(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_18(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_20(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_19(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_21(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_20(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_22(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_21(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_23(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_22(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_24(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_23(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_25(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_24(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_26(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_25(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_27(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_26(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_28(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_27(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_29(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_28(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_30(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_29(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_31(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_30(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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#define MOZ_ROLL_EACH_32(m, s, fa, a) \
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MOZ_ROLL_EACH_HELPER(m, fa, a) \
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MOZ_ROLL_EACH_EXPAND_HELPER s MOZ_ROLL_EACH_31(m, s, fa, (MOZ_ARGS_AFTER_1 a))
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} // namespace mozilla
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#endif /* mozilla_AtomicBitfields_h */
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