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//===--- CompatibilityConcurrency.cpp -------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Runtime/Metadata.h"
#include <dispatch/dispatch.h>
#include <dlfcn.h>
// Allow this library to get force-loaded by autolinking
__attribute__((weak, visibility("hidden"))) extern "C" char
_swift_FORCE_LOAD_$_swiftCompatibilityConcurrency = 0;
using namespace swift;
namespace swift {
// Entrypoint called by the compiler when back-deploying concurrency, which
// switches between the real implementation of
// swift_getFunctionTypeMetadataGlobalActor and
// swift_getFunctionTypeMetadataGlobalActorStandalone depending on what system
// it is running on.
SWIFT_RUNTIME_STDLIB_INTERNAL
const FunctionTypeMetadata *
swift_getFunctionTypeMetadataGlobalActorBackDeploy(
FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
const Metadata *const *parameters, const uint32_t *parameterFlags,
const Metadata *result, const Metadata *globalActor);
} // end namespace swift
const FunctionTypeMetadata *
swift::swift_getFunctionTypeMetadataGlobalActorBackDeploy(
FunctionTypeFlags flags, FunctionMetadataDifferentiabilityKind diffKind,
const Metadata *const *parameters, const uint32_t *parameterFlags,
const Metadata *result, const Metadata *globalActor) {
using BuilderFn = const FunctionTypeMetadata *(*)(
FunctionTypeFlags, FunctionMetadataDifferentiabilityKind,
const Metadata *const *, const uint32_t *,
const Metadata *, const Metadata *);
static BuilderFn builderFn;
static dispatch_once_t builderToken;
dispatch_once(&builderToken, ^{
// Prefer the function from the Swift runtime if it is available.
builderFn = reinterpret_cast<BuilderFn>(
dlsym(RTLD_DEFAULT, "swift_getFunctionTypeMetadataGlobalActor"));
if (builderFn)
return;
builderFn = reinterpret_cast<BuilderFn>(
dlsym(RTLD_DEFAULT,
"swift_getFunctionTypeMetadataGlobalActorStandalone"));
});
assert(builderFn && "No way to build global-actor-qualified function type");
return builderFn(
flags, diffKind, parameters, parameterFlags, result, globalActor);
}
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