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188c7bd626
This patch replaces the platform version check with a dlsym to grab the symbol we need. If we're on a new enough platform, the symbol should be available and we can use it. Otherwise, it will be empty and we should return true. This breaks the link requirement for the platform version symbol.
113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
//===--- VoucherShims.h - Shims for OS vouchers --------------------*- 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 - 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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//
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// Shims for interfacing with OS voucher calls.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_CONCURRENCY_VOUCHERSHIMS_BACKDEPLOY56_H
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#define SWIFT_CONCURRENCY_VOUCHERSHIMS_BACKDEPLOY56_H
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#include <cstdint>
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#include "swift/Runtime/Config.h"
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#include "swift/Basic/Lazy.h"
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#include <dlfcn.h>
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// swift-corelibs-libdispatch has os/voucher_private.h but it doesn't work for
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// us yet, so only look for it on Apple platforms.
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#if __APPLE__ && __has_include(<os/voucher_private.h>)
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#define SWIFT_HAS_VOUCHER_HEADER 1
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#include <os/voucher_private.h>
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#endif
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// A "dead" voucher pointer, indicating that a voucher has been removed from
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// a Job, distinct from a NULL voucher that could just mean no voucher was
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// present. This allows us to catch problems like adopting a voucher from the
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// same Job twice without restoring it.
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#define SWIFT_DEAD_VOUCHER ((voucher_t)-1)
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// The OS has voucher support if it has the header or if it has ObjC interop.
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#if SWIFT_HAS_VOUCHER_HEADER || SWIFT_OBJC_INTEROP
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#define SWIFT_HAS_VOUCHERS 1
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#endif
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#if SWIFT_HAS_VOUCHERS
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#if SWIFT_HAS_VOUCHER_HEADER
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#else // SWIFT_HAS_VOUCHER_HEADER
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// If the header isn't available, declare the necessary calls here.
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#include <os/object.h>
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
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OS_OBJECT_DECL_CLASS(voucher);
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#pragma clang diagnostic pop
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extern "C" voucher_t _Nullable voucher_copy(void);
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// Consumes argument, returns retained value.
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extern "C" voucher_t _Nullable voucher_adopt(voucher_t _Nullable voucher);
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#endif // __has_include(<os/voucher_private.h>)
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static inline void swift_voucher_release(voucher_t _Nullable voucher) {
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// This NULL check isn't necessary, but NULL vouchers will be common, so
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// optimize for that.
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if (!voucher)
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return;
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if (voucher == SWIFT_DEAD_VOUCHER)
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return;
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os_release(voucher);
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}
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#else // __APPLE__
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// Declare some do-nothing stubs for OSes without voucher support.
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typedef void *voucher_t;
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static inline voucher_t _Nullable voucher_copy(void) { return nullptr; }
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static inline voucher_t _Nullable voucher_adopt(voucher_t _Nullable voucher) {
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return nullptr;
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}
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static inline void swift_voucher_release(voucher_t _Nullable voucher) {}
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#endif // __APPLE__
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// Declare our own voucher_needs_adopt for when we don't get it from the SDK.
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// This declaration deliberately takes `void *` instead of `voucher_t`. When the
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// SDK provides one that takes `voucher_t`, then C++ overload resolution will
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// favor that one. When the SDK does not provide a declaration, then the call
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// site will invoke this stub instead.
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static inline bool voucher_needs_adopt(void * _Nullable voucher) {
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return true;
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}
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static inline bool swift_voucher_needs_adopt(voucher_t _Nullable voucher) {
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#if __APPLE__
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// _Z19voucher_needs_adoptP9voucher_s
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const auto voucherNeedsAdopt =
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reinterpret_cast<bool(*)(voucher_t)>(SWIFT_LAZY_CONSTANT(
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dlsym(RTLD_DEFAULT, "_Z19voucher_needs_adoptP9voucher_s")));
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if (voucherNeedsAdopt) {
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return voucherNeedsAdopt(voucher);
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}
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return true;
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#else
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return voucher_needs_adopt(voucher);
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#endif
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}
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#endif // SWIFT_CONCURRENCY_VOUCHERSHIMS_BACKDEPLOY56_H
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