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5b027ca456
When back-deploying, create global-actor-qualified function types via a separate entrypoint (`swift_getFunctionTypeMetadataGlobalActorBackDeploy`) in the compatibility library, which checks whether it is running with a new-enough runtime to use `swift_getFunctionTypeMetadataGlobalActor`. Failing that, it calls into a separate copy of the implementation that exists only in the back-deployed concurrency library. Fixes rdar://79153988.
83 lines
3.4 KiB
C++
83 lines
3.4 KiB
C++
//===--- CompatibilityConcurrency.cpp -------------------------------------===//
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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 - 2021 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 "swift/Runtime/Metadata.h"
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#include <dispatch/dispatch.h>
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#include <dlfcn.h>
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// Allow this library to get force-loaded by autolinking
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__attribute__((weak, visibility("hidden"))) extern "C" char
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_swift_FORCE_LOAD_$_swiftCompatibilityConcurrency = 0;
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using namespace swift;
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namespace swift {
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// Entrypoint provided by the runtime in the OS that first contains support for
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// concurrency. Explicitly redeclared as "weak" because this code will run on
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// systems where it is not present.
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const FunctionTypeMetadata *
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swift_getFunctionTypeMetadataGlobalActor(
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FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
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const Metadata *const *parameters, const uint32_t *parameterFlags,
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const Metadata *result, const Metadata *globalActor
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) SWIFT_RUNTIME_WEAK_IMPORT;
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// Entrypoint provided only in the back-deployed concurrency library, which
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// has a separate allocation area for global-actor-qualified function types.
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extern "C"
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const FunctionTypeMetadata *
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swift_getFunctionTypeMetadataGlobalActorStandalone(
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FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
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const Metadata *const *parameters, const uint32_t *parameterFlags,
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const Metadata *result, const Metadata *globalActor
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) SWIFT_RUNTIME_WEAK_IMPORT;
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// Entrypoint called by the compiler when back-deploying concurrency, which
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// switches between the real implementation of
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// swift_getFunctionTypeMetadataGlobalActor and
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// swift_getFunctionTypeMetadataGlobalActorStandalone depending on what system
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// it is running on.
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SWIFT_RUNTIME_STDLIB_INTERNAL
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const FunctionTypeMetadata *
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swift_getFunctionTypeMetadataGlobalActorBackDeploy(
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FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
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const Metadata *const *parameters, const uint32_t *parameterFlags,
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const Metadata *result, const Metadata *globalActor);
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} // end namespace swift
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const FunctionTypeMetadata *
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swift::swift_getFunctionTypeMetadataGlobalActorBackDeploy(
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FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
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const Metadata *const *parameters, const uint32_t *parameterFlags,
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const Metadata *result, const Metadata *globalActor) {
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using BuilderFn = const FunctionTypeMetadata *(*)(
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FunctionTypeFlags, FunctionMetadataDifferentiabilityKind,
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const Metadata *const *, const uint32_t *,
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const Metadata *, const Metadata *);
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static BuilderFn builderFn;
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static dispatch_once_t builderToken;
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dispatch_once(&builderToken, ^{
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if (swift_getFunctionTypeMetadataGlobalActor) {
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builderFn = swift_getFunctionTypeMetadataGlobalActor;
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return;
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}
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builderFn = reinterpret_cast<BuilderFn>(
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dlsym(RTLD_DEFAULT,
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"swift_getFunctionTypeMetadataGlobalActorStandalone"));
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});
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assert(builderFn && "No way to build global-actor-qualified function type");
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return builderFn(
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flags, diffKind, parameters, parameterFlags, result, globalActor);
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}
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