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56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
//===--- Reflection.h - Swift Language Reflection Support -------*- 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 - 2016 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 http://swift.org/LICENSE.txt for license information
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// See http://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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// An implementation of value reflection based on type metadata.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Runtime/Metadata.h"
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#include <cstdlib>
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namespace swift {
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struct MirrorWitnessTable;
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/// The layout of protocol<Mirror>.
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struct Mirror {
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OpaqueExistentialContainer Header;
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const MirrorWitnessTable *MirrorWitness;
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};
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// Swift assumes Mirror is returned in memory.
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// Use MirrorReturn to guarantee that even on architectures
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// where Mirror would be returned in registers.
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struct MirrorReturn {
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Mirror mirror;
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MirrorReturn(Mirror m) : mirror(m) { }
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operator Mirror() { return mirror; }
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~MirrorReturn() { }
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};
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// We intentionally use a non-POD return type with these entry points to give
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// them an indirect return ABI for compatibility with Swift.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wreturn-type-c-linkage"
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/// func reflect<T>(x: T) -> Mirror
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///
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/// Produce a mirror for any value. If the value's type conforms to _Reflectable,
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/// invoke its _getMirror() method; otherwise, fall back to an implementation
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/// in the runtime that structurally reflects values of any type.
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extern "C" MirrorReturn
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swift_reflectAny(OpaqueValue *value, const Metadata *T);
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#pragma clang diagnostic pop
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}
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