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75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
//===--- MetadataSections.h -----------------------------------------------===//
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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 - 2020 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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/// \file
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/// This file contains the declaration of the MetadataSectionsRange and
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/// MetadataSections struct, which represent, respectively, information about
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/// an image's section, and an image's metadata information (which is composed
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/// of multiple section information).
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///
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_STDLIB_SHIMS_METADATASECTIONS_H
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#define SWIFT_STDLIB_SHIMS_METADATASECTIONS_H
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#include "SwiftStddef.h"
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#include "SwiftStdint.h"
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#ifdef __cplusplus
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namespace swift {
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extern "C" {
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#endif
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/// Specifies the address range corresponding to a section.
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typedef struct MetadataSectionRange {
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__swift_uintptr_t start;
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__swift_size_t length;
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} MetadataSectionRange;
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/// Identifies the address space ranges for the Swift metadata required by the Swift runtime.
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struct MetadataSections {
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__swift_uintptr_t version;
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__swift_uintptr_t reserved;
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/// `next` and `prev` are used by the runtime to construct a
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/// circularly doubly linked list to quickly iterate over the metadata
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/// from each image loaded into the address space. These are invasive
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/// to enable the runtime registration, which occurs at image load time, to
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/// be allocation-free as it is invoked from an image constructor function
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/// context where the system may not yet be ready to perform allocations.
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/// Additionally, avoiding the allocation enables a fast load operation, which
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/// directly impacts application load time.
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struct MetadataSections *next;
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struct MetadataSections *prev;
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MetadataSectionRange swift5_protocols;
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MetadataSectionRange swift5_protocol_conformances;
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MetadataSectionRange swift5_type_metadata;
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MetadataSectionRange swift5_typeref;
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MetadataSectionRange swift5_reflstr;
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MetadataSectionRange swift5_fieldmd;
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MetadataSectionRange swift5_assocty;
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MetadataSectionRange swift5_replace;
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MetadataSectionRange swift5_replac2;
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MetadataSectionRange swift5_builtin;
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MetadataSectionRange swift5_capture;
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};
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#ifdef __cplusplus
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} //extern "C"
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} // namespace swift
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#endif
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#endif // SWIFT_STDLIB_SHIMS_METADATASECTIONS_H
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