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101788dbd4
Use the KeyPath implementation's new support for instantiating and dealing with captures to lower the generic context required to dispatch computed accessors with dependent generics.
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
//===--- KeyPaths.cpp - Key path helper symbols ---------------------------===//
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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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#include "../SwiftShims/Visibility.h"
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#include "swift/Runtime/Config.h"
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#include <cstdint>
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#include <cstring>
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SWIFT_CC(swift)
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static void copyGenericArguments(const void *src, void *dest, size_t bytes) {
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memcpy(dest, src, bytes);
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}
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SWIFT_CC(swift)
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static bool equateGenericArguments(const void *a, const void *b, size_t bytes) {
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// Generic arguments can't affect equality, since an equivalent key path may
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// have been formed in a fully concrete context without capturing generic
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// arguments.
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return true;
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}
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SWIFT_CC(swift)
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static intptr_t hashGenericArguments(const void *src, size_t bytes) {
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// Generic arguments can't affect equality, since an equivalent key path may
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// have been formed in a fully concrete context without capturing generic
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// arguments. The implementation recognizes a hash value return of '0' as
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// "no effect on the hash".
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return 0;
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}
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/// A prefab witness table for computed key path components that only include
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/// captured generic arguments.
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SWIFT_RUNTIME_EXPORT
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void *(swift_keyPathGenericWitnessTable[]) = {
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nullptr, // no destructor necessary
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(void*)(uintptr_t)copyGenericArguments,
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(void*)(uintptr_t)equateGenericArguments,
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(void*)(uintptr_t)hashGenericArguments,
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};
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