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96555ba51c
The existing lookup uses a hash table with the type's mangled name as the key. Building that key is costly. Add a new table that uses pointer keys, so that we can use the descriptor and arguments directly as the key. rdar://127621414
103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
//===--- LibPrespecialized.h - Interface for prespecializations -*- 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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// Interface for interacting with prespecialized metadata library.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_LIB_PRESPECIALIZED_H
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#define SWIFT_LIB_PRESPECIALIZED_H
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#include "PrebuiltStringMap.h"
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#include "swift/ABI/Metadata.h"
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#include "swift/ABI/TargetLayout.h"
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#define LIB_PRESPECIALIZED_TOP_LEVEL_SYMBOL_NAME "_swift_prespecializationsData"
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namespace swift {
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template <typename Runtime>
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struct LibPrespecializedData {
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uint32_t majorVersion;
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uint32_t minorVersion;
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TargetPointer<Runtime, const void> metadataMap;
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TargetPointer<Runtime, const void> disabledProcessesTable;
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TargetPointer<Runtime, const void> pointerKeyedMetadataMap;
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typename Runtime::StoredSize optionFlags;
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// Existing fields are above, add new fields below this point.
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static constexpr uint32_t currentMajorVersion = 1;
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static constexpr uint32_t currentMinorVersion = 3;
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static constexpr uint32_t minorVersionWithDisabledProcessesTable = 2;
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static constexpr uint32_t minorVersionWithPointerKeyedMetadataMap = 3;
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static constexpr uint32_t minorVersionWithOptionFlags = 3;
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// Option flags values.
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enum : typename Runtime::StoredSize {
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// When this flag is set, the runtime should default to using the
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// pointer-keyed table. When not set, default to using the name-keyed table.
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OptionFlagDefaultToPointerKeyedMap = 1ULL << 0,
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};
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// Helpers for retrieving the metadata map in-process.
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static bool stringIsNull(const char *str) { return str == nullptr; }
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using MetadataMap = PrebuiltStringMap<const char *, Metadata *, stringIsNull>;
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const MetadataMap *getMetadataMap() const {
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return reinterpret_cast<const MetadataMap *>(metadataMap);
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}
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const char *const *getDisabledProcessesTable() const {
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if (minorVersion < minorVersionWithDisabledProcessesTable)
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return nullptr;
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return reinterpret_cast<const char *const *>(disabledProcessesTable);
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}
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const void *getPointerKeyedMetadataMap() const {
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if (minorVersion < minorVersionWithPointerKeyedMetadataMap)
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return nullptr;
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return pointerKeyedMetadataMap;
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}
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typename Runtime::StoredSize getOptionFlags() const {
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if (minorVersion < minorVersionWithOptionFlags)
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return 0;
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return optionFlags;
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}
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};
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const LibPrespecializedData<InProcess> *getLibPrespecializedData();
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Metadata *getLibPrespecializedMetadata(const TypeContextDescriptor *description,
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const void *const *arguments);
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void libPrespecializedImageLoaded();
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} // namespace swift
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// Validate the prespecialized metadata map by building each entry dynamically
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// and comparing. This should be called before any metadata is built for other
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// purposes, as any prespecialized entries that have already been cached will
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// not be rebuilt, so the validation will be comparing the prespecialized
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// metadata with itself.
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//
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// On return, outValidated is set to the total number of metadata records that
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// were validated (which is the total number in the table), and outFailed is set
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// to the number that failed validation.
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SWIFT_RUNTIME_EXPORT
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void _swift_validatePrespecializedMetadata();
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#endif // SWIFT_LIB_PRESPECIALIZED_H
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