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https://github.com/apple/swift.git
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091b005a60
This change adds a new type of cache (cache by type descriptor) to the protocol conformance lookup system. This optimization is beneficial for generic types, where the same conformance can be reused across different instantiations of the generic type. Key changes: - Add a `GetOrInsertManyScope` class to `ConcurrentReadableHashMap` for performing multiple insertions under a single lock - Add type descriptor-based caching for protocol conformances - Add environment variables for controlling and debugging the conformance cache - Add tests to verify the behavior of the conformance cache - Fix for https://github.com/swiftlang/swift/issues/82889 The implementation is controlled by the `SWIFT_DEBUG_ENABLE_CACHE_PROTOCOL_CONFORMANCES_BY_TYPE_DESCRIPTOR` environment variable, which is enabled by default. This reapplies https://github.com/swiftlang/swift/pull/82818 after it's been reverted in https://github.com/swiftlang/swift/pull/83770.
122 lines
5.5 KiB
Swift
122 lines
5.5 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-build-swift %s -o %t/a.out
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// RUN: env SWIFT_DEBUG_ENABLE_PROTOCOL_CONFORMANCES_LOOKUP_LOG=1 %target-run %t/a.out 2>&1 | %FileCheck %s
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// REQUIRES: executable_test
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// REQUIRES: swift_stdlib_asserts
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// UNSUPPORTED: DARWIN_SIMULATOR=ios
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// UNSUPPORTED: DARWIN_SIMULATOR=tvos
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// UNSUPPORTED: DARWIN_SIMULATOR=watchos
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// UNSUPPORTED: DARWIN_SIMULATOR=xros
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// UNSUPPORTED: use_os_stdlib
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// The optimizer will remove many of these conformance checks due to statically
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// knowing the result.
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// UNSUPPORTED: swift_test_mode_optimize
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// UNSUPPORTED: swift_test_mode_optimize_size
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protocol Proto {}
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extension Proto {
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static var selfType: Any.Type { Self.self }
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}
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func conformsToProto<T>(_ type: T.Type) -> Bool {
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(type as? Proto.Type)?.selfType == type
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}
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func doesNotConformToProto<T>(_ type: T) -> Bool {
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(type as? Proto.Type) == nil
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}
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extension Array: Proto {}
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extension Dictionary: Proto where Key: Proto {}
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extension Int: Proto {}
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// CHECK: Check confomance Swift.Int to Proto: found, source: section scan
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assert(conformsToProto(Int.self))
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// CHECK: Check confomance Swift.Int to Proto: found, source: cache by type metadata
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assert(conformsToProto(Int.self))
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// CHECK: Check confomance Swift.String to Proto: not found, source: section scan
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assert(doesNotConformToProto(String.self))
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// CHECK: Check confomance Swift.String to Proto: not found, source: cache by type metadata
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assert(doesNotConformToProto(String.self))
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// CHECK: Check confomance Swift.Array<Swift.Int> to Proto: found, source: section scan
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assert(conformsToProto([Int].self))
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// CHECK: Check confomance Swift.Array<Swift.Int> to Proto: found, source: cache by type metadata
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assert(conformsToProto([Int].self))
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// CHECK: Check confomance Swift.Array<Swift.String> to Proto: found, source: cache by type descriptor
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assert(conformsToProto([String].self))
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// CHECK: Check confomance Swift.Array<Swift.String> to Proto: found, source: cache by type metadata
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assert(conformsToProto([String].self))
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// CHECK: Check confomance Swift.Dictionary<Swift.Int, Swift.Int> to Proto: found, source: section scan
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assert(conformsToProto([Int: Int].self))
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// CHECK: Check confomance Swift.Dictionary<Swift.String, Swift.Int> to Proto: not found, source: cache by type descriptor
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assert(doesNotConformToProto([String: Int].self))
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// CHECK: Check confomance Swift.Dictionary<Swift.String, Swift.Int> to Proto: not found, source: cache by type metadata
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assert(doesNotConformToProto([String: Int].self))
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class BaseClass: Proto {}
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class DerivedClass: BaseClass {}
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class GenericClass<T>: Proto {}
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class GenericClassConditional<T> {}
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extension GenericClassConditional: Proto where T: Proto {}
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// CHECK: Check confomance a.BaseClass to Proto: found, source: section scan
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assert(conformsToProto(BaseClass.self))
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// CHECK: Check confomance a.BaseClass to Proto: found, source: cache by type metadata
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assert(conformsToProto(BaseClass.self))
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// CHECK: Check confomance a.DerivedClass to Proto: found, source: section scan
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assert(conformsToProto(DerivedClass.self))
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// CHECK: Check confomance a.DerivedClass to Proto: found, source: cache by type metadata
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assert(conformsToProto(DerivedClass.self))
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// CHECK: Check confomance a.GenericClass<Swift.Int> to Proto: found, source: section scan
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assert(conformsToProto(GenericClass<Int>.self))
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// CHECK: Check confomance a.GenericClass<Swift.Int> to Proto: found, source: cache by type metadata
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assert(conformsToProto(GenericClass<Int>.self))
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// CHECK: Check confomance a.GenericClass<Swift.String> to Proto: found, source: cache by type descriptor
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assert(conformsToProto(GenericClass<String>.self))
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// CHECK: Check confomance a.GenericClass<Swift.String> to Proto: found, source: cache by type metadata
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assert(conformsToProto(GenericClass<String>.self))
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// CHECK: Check confomance a.GenericClassConditional<Swift.Int> to Proto: found, source: section scan
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assert(conformsToProto(GenericClassConditional<Int>.self))
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// CHECK: Check confomance a.GenericClassConditional<Swift.Int> to Proto: found, source: cache by type metadata
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assert(conformsToProto(GenericClassConditional<Int>.self))
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// CHECK: Check confomance a.GenericClassConditional<Swift.String> to Proto: not found, source: cache by type descriptor
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assert(doesNotConformToProto(GenericClassConditional<String>.self))
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// CHECK: Check confomance a.GenericClassConditional<Swift.String> to Proto: not found, source: cache by type metadata
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assert(doesNotConformToProto(GenericClassConditional<String>.self))
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enum Enum: Proto {}
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extension Optional: Proto where Wrapped: Proto {}
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// CHECK: Check confomance a.Enum to Proto: found, source: section scan
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assert(conformsToProto(Enum.self))
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// CHECK: Check confomance a.Enum to Proto: found, source: cache by type metadata
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assert(conformsToProto(Enum.self))
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// CHECK: Check confomance Swift.Optional<a.Enum> to Proto: found, source: section scan
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assert(conformsToProto(Enum?.self))
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// CHECK: Check confomance Swift.Optional<a.Enum> to Proto: found, source: cache by type metadata
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assert(conformsToProto(Enum?.self))
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// CHECK: Check confomance Swift.Optional<Swift.Int> to Proto: found, source: cache by type descriptor
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assert(conformsToProto(Int?.self))
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// CHECK: Check confomance Swift.Optional<Swift.Int> to Proto: found, source: cache by type metadata
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assert(conformsToProto(Int?.self))
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// CHECK: Check confomance Swift.Optional<Swift.String> to Proto: not found, source: cache by type descriptor
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assert(doesNotConformToProto(String?.self))
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// CHECK: Check confomance Swift.Optional<Swift.String> to Proto: not found, source: cache by type metadata
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assert(doesNotConformToProto(String?.self))
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