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29c350e813
Create a version of the metadata specialization code which is abstracted so that it can work in different contexts, such as building specialized metadata from dylibs on disk rather than from inside a running process. The GenericMetadataBuilder class is templatized on a ReaderWriter. The ReaderWriter abstracts out everything that's different between in-process and external construction of this data. Instead of reading and writing pointers directly, the builder calls the ReaderWriter to resolve and write pointers. The ReaderWriter also handles symbol lookups and looking up other Swift types by name. This is accompanied by a simple implementation of the ReaderWriter which works in-process. The abstracted calls to resolve and write pointers are implemented using standard pointer dereferencing. A new SWIFT_DEBUG_VALIDATE_EXTERNAL_GENERIC_METADATA_BUILDER environment variable uses the in-process ReaderWriter to validate the builder by running it in parallel with the existing metadata builder code in the runtime. When enabled, the GenericMetadataBuilder is used to build a second copy of metadata built by the runtime, and the two are compared to ensure that they match. When this environment variable is not set, the new builder code is inactive. The builder is incomplete, and this initial version only works on structs. Any unsupported type produces an error, and skips the validation. rdar://116592420
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
//===--- GenericMetadataBuilder.h - Math utilities. -------------*- 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 - 2024 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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// Utility functions for math operations.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_MATH_UTILS_H
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#define SWIFT_BASIC_MATH_UTILS_H
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#include <cstddef>
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namespace swift {
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/// Round the given value up to the given alignment, as a power of two.
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template <class T>
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static inline constexpr T roundUpToAlignment(T offset, T alignment) {
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return (offset + alignment - 1) & ~(alignment - 1);
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}
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/// Round the given value up to the given alignment, expressed as a mask (a
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/// power of two minus one).
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static inline size_t roundUpToAlignMask(size_t size, size_t alignMask) {
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return (size + alignMask) & ~alignMask;
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}
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} // namespace swift
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#endif // #ifndef SWIFT_BASIC_MATH_UTILS_H
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