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3ae6d7cb4d
On architectures where the calling convention uses the same argument register as
return register this allows the argument register to be live through the calls.
We use LLVM's 'returned' attribute on the parameter to facilitate this.
We used to perform this optimization via an optimization pass. This was ripped
out some time ago around commit 955e4ed652.
By using LLVM's 'returned' attribute on swift_*retain, we get the same
optimization from the LLVM backend.
72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
//===--- InstrumentsSupport.h - Support for Instruments.app -----*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Swift runtime support for instruments.app
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// In the long run, they plan to use dyld to make this indirection go away.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_INSTRUMENTS_SUPPORT_H
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#define SWIFT_RUNTIME_INSTRUMENTS_SUPPORT_H
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namespace swift {
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SWIFT_RUNTIME_EXPORT
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HeapObject *(*_swift_allocObject)(HeapMetadata const *metadata,
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size_t requiredSize,
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size_t requiredAlignmentMask);
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SWIFT_RUNTIME_EXPORT
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BoxPair::Return (*_swift_allocBox)(Metadata const *type);
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SWIFT_RUNTIME_EXPORT
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HeapObject *(*_swift_retain)(HeapObject *object);
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SWIFT_RUNTIME_EXPORT
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HeapObject *(*_swift_retain_n)(HeapObject *object, uint32_t n);
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SWIFT_RUNTIME_EXPORT
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HeapObject *(*_swift_nonatomic_retain)(HeapObject *object);
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SWIFT_RUNTIME_EXPORT
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HeapObject *(*_swift_tryRetain)(HeapObject *object);
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SWIFT_RUNTIME_EXPORT
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bool (*_swift_isDeallocating)(HeapObject *object);
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SWIFT_RUNTIME_EXPORT
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void (*_swift_release)(HeapObject *object);
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SWIFT_RUNTIME_EXPORT
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void (*_swift_release_n)(HeapObject *object, uint32_t n);
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SWIFT_RUNTIME_EXPORT
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void (*_swift_nonatomic_release)(HeapObject *object);
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// liboainject on iOS 8 patches the function pointers below if present.
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// Do not reuse these names unless you do what oainject expects you to do.
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typedef size_t AllocIndex;
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SWIFT_RUNTIME_EXPORT
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void *(*_swift_alloc)(AllocIndex idx);
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SWIFT_RUNTIME_EXPORT
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void *(*_swift_tryAlloc)(AllocIndex idx);
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SWIFT_RUNTIME_EXPORT
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void *(*_swift_slowAlloc)(size_t bytes, size_t alignMask,
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uintptr_t flags);
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SWIFT_RUNTIME_EXPORT
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void (*_swift_dealloc)(void *ptr, AllocIndex idx);
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SWIFT_RUNTIME_EXPORT
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void (*_swift_slowDealloc)(void *ptr, size_t bytes, size_t alignMask);
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SWIFT_RUNTIME_EXPORT
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size_t _swift_indexToSize(AllocIndex idx);
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SWIFT_RUNTIME_EXPORT
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int _swift_sizeToIndex(size_t size);
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SWIFT_RUNTIME_EXPORT
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void _swift_zone_init(void);
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};
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#endif
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