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e223f1fc9b
* Remove RegisterPreservingCC. It was unused. * Remove DefaultCC from the runtime. The distinction between C_CC and DefaultCC was unused and inconsistently applied. Separate C_CC and DefaultCC are still present in the compiler. * Remove function pointer indirection from runtime functions except those that are used by Instruments. The remaining Instruments interface is expected to change later due to function pointer liability. * Remove swift_rt_ wrappers. Function pointers are an ABI liability that we don't want, and there are better ways to get nonlazy binding if we need it. The fully custom wrappers were only needed for RegisterPreservingCC and for optimizing the Instruments function pointers.
151 lines
5.2 KiB
C++
151 lines
5.2 KiB
C++
//===--- Config.h - Swift Language Platform Configuration -------*- 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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// Definitions of common interest in Swift.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_CONFIG_H
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#define SWIFT_RUNTIME_CONFIG_H
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// Bring in visibility attribute macros for library visibility.
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#include "llvm/Support/Compiler.h"
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/// Does the current Swift platform support "unbridged" interoperation
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/// with Objective-C? If so, the implementations of various types must
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/// implicitly handle Objective-C pointers.
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///
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/// Apple platforms support this by default.
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#ifndef SWIFT_OBJC_INTEROP
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#ifdef __APPLE__
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#define SWIFT_OBJC_INTEROP 1
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#else
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#define SWIFT_OBJC_INTEROP 0
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#endif
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#endif
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/// Does the current Swift platform allow information other than the
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/// class pointer to be stored in the isa field? If so, when deriving
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/// the class pointer of an object, we must apply a
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/// dynamically-determined mask to the value loaded from the first
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/// field of the object.
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///
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/// According to the Objective-C ABI, this is true only for 64-bit
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/// platforms.
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#ifndef SWIFT_HAS_ISA_MASKING
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#if SWIFT_OBJC_INTEROP && __POINTER_WIDTH__ == 64
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#define SWIFT_HAS_ISA_MASKING 1
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#else
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#define SWIFT_HAS_ISA_MASKING 0
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#endif
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#endif
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/// Does the current Swift platform have ISA pointers which should be opaque
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/// to anyone outside the Swift runtime? Similarly to the ISA_MASKING case
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/// above, information other than the class pointer could be contained in the
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/// ISA.
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#ifndef SWIFT_HAS_OPAQUE_ISAS
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#if __ARM_ARCH_7K__ >= 2
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#define SWIFT_HAS_OPAQUE_ISAS 1
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#else
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#define SWIFT_HAS_OPAQUE_ISAS 0
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#endif
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#endif
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#if SWIFT_HAS_OPAQUE_ISAS && SWIFT_HAS_ISA_MASKING
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#error Masking ISAs are incompatible with opaque ISAs
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#endif
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/// Which bits in the class metadata are used to distinguish Swift classes
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/// from ObjC classes?
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#ifndef SWIFT_CLASS_IS_SWIFT_MASK
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# if __APPLE__ && SWIFT_OBJC_INTEROP && SWIFT_DARWIN_ENABLE_STABLE_ABI_BIT
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# define SWIFT_CLASS_IS_SWIFT_MASK 2ULL
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# else
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# define SWIFT_CLASS_IS_SWIFT_MASK 1ULL
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# endif
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#endif
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// We try to avoid global constructors in the runtime as much as possible.
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// These macros delimit allowed global ctors.
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#if __clang__
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# define SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN \
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_Pragma("clang diagnostic push") \
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_Pragma("clang diagnostic ignored \"-Wglobal-constructors\"")
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# define SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END \
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_Pragma("clang diagnostic pop")
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#else
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# define SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN
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# define SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END
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#endif
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// Bring in visibility attribute macros
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#include "../../../stdlib/public/SwiftShims/Visibility.h"
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// Define mappings for calling conventions.
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// Annotation for specifying a calling convention of
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// a runtime function. It should be used with declarations
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// of runtime functions like this:
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// void runtime_function_name() SWIFT_CC(swift)
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#define SWIFT_CC(CC) SWIFT_CC_##CC
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// SWIFT_CC(c) is the C calling convention.
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#define SWIFT_CC_c
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// SWIFT_CC(swift) is the Swift calling convention.
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// FIXME: the next comment is false.
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// Functions outside the stdlib or runtime that include this file may be built
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// with a compiler that doesn't support swiftcall; don't define these macros
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// in that case so any incorrect usage is caught.
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#if __has_attribute(swiftcall)
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#define SWIFT_CC_swift __attribute__((swiftcall))
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#define SWIFT_CONTEXT __attribute__((swift_context))
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#define SWIFT_ERROR_RESULT __attribute__((swift_error_result))
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#define SWIFT_INDIRECT_RESULT __attribute__((swift_indirect_result))
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#else
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#define SWIFT_CC_swift
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#define SWIFT_CONTEXT
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#define SWIFT_ERROR_RESULT
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#define SWIFT_INDIRECT_RESULT
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#endif
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// SWIFT_CC(PreserveMost) is used in the runtime implementation to prevent
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// register spills on the hot path.
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// It is not safe to use for external calls; the loader's lazy function
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// binding may not save all of the registers required for this convention.
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#if __has_attribute(preserve_most) && \
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(defined(__aarch64__) || defined(__x86_64__))
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#define SWIFT_CC_PreserveMost __attribute__((preserve_most))
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#else
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#define SWIFT_CC_PreserveMost
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#endif
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// This is the DefaultCC value used by the compiler.
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// FIXME: the runtime's code does not honor DefaultCC
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// so changing this value is not sufficient.
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#define SWIFT_DEFAULT_LLVM_CC llvm::CallingConv::C
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// These are temporary macros during the +0 cc exploration to cleanly support
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// both +0 and +1 in the runtime.
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#ifndef SWIFT_RUNTIME_ENABLE_GUARANTEED_NORMAL_ARGUMENTS
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#define SWIFT_NS_RELEASES_ARGUMENT NS_RELEASES_ARGUMENT
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#define SWIFT_CC_PLUSONE_GUARD(...) do { __VA_ARGS__ ; } while (0)
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#define SWIFT_CC_PLUSZERO_GUARD(...)
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#else
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#define SWIFT_NS_RELEASES_ARGUMENT
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#define SWIFT_CC_PLUSONE_GUARD(...)
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#define SWIFT_CC_PLUSZERO_GUARD(...) do { __VA_ARGS__ ; } while (0)
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#endif
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#endif // SWIFT_RUNTIME_CONFIG_H
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