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3e64d03a52
Some notes: 1. Even though I refactored out AccessSet/Access from Exclusivity.cpp -> ExclusivityPrivate.h, I left the actual implementations of insert/remove in Exclusivity.cpp to allow for the most aggressive optimization for use in Exclusivity.cpp without exposing a bunch of internal details to other parts of the runtime. Smaller routines like getHead() and manipulating the linked list directly I left as methods that can be used by other parts of the runtime. I am going to use these methods to enable backwards deployment of exclusivity support for concurrency. 2. I moved function replacements out of the Exclusivity header/cpp files since it has nothing to do with Exclusivity beyond taking advantage of the TLS context that we are already using.
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
//===--- ProtocolConformance.cpp - Swift protocol conformance checking ----===//
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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 - 2019 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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// Runtime support for dynamic replaceable functions.
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//
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// This implementation is intended to be backward-deployed into Swift 5.0
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// runtimes.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Runtime/Exclusivity.h"
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#include "swift/Runtime/FunctionReplacement.h"
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#include "swift/Runtime/Once.h"
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#include "swift/Runtime/ThreadLocalStorage.h"
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using namespace swift;
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__attribute__((visibility("hidden"), weak))
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extern "C" char *swift_getFunctionReplacement50(char **ReplFnPtr, char *CurrFn) {
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// Call the current implementation if it is available.
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if (swift_getFunctionReplacement)
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return swift_getFunctionReplacement(ReplFnPtr, CurrFn);
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char *ReplFn = *ReplFnPtr;
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char *RawReplFn = ReplFn;
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#if SWIFT_PTRAUTH
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RawReplFn = ptrauth_strip(RawReplFn, ptrauth_key_function_pointer);
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#endif
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if (RawReplFn == CurrFn)
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return nullptr;
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auto origKey =
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(uintptr_t)SWIFT_THREAD_GETSPECIFIC(SWIFT_COMPATIBILITY_50_TLS_KEY);
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if ((origKey & 0x1) != 0) {
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auto mask = ((uintptr_t)-1) < 1;
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auto resetKey = origKey & mask;
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SWIFT_THREAD_SETSPECIFIC(SWIFT_COMPATIBILITY_50_TLS_KEY, (void *)resetKey);
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return nullptr;
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}
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return ReplFn;
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}
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__attribute__((visibility("hidden"), weak))
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extern "C" char *swift_getOrigOfReplaceable50(char **OrigFnPtr) {
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// Call the current implementation if it is available.
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if (swift_getOrigOfReplaceable)
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return swift_getOrigOfReplaceable(OrigFnPtr);
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char *OrigFn = *OrigFnPtr;
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auto origKey =
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(uintptr_t)SWIFT_THREAD_GETSPECIFIC(SWIFT_COMPATIBILITY_50_TLS_KEY);
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auto newKey = origKey | 0x1;
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SWIFT_THREAD_SETSPECIFIC(SWIFT_COMPATIBILITY_50_TLS_KEY, (void *)newKey);
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return OrigFn;
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}
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// Allow this library to get force-loaded by autolinking
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__attribute__((weak, visibility("hidden")))
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extern "C"
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char _swift_FORCE_LOAD_$_swiftCompatibilityDynamicReplacements = 0;
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