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6a383b270e
We have a few constructor functions that aren't wrapped in SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN/SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END and which have started to produce warnings in a new clang version. Explicitly allow these constructors by adding those. rdar://147703947
123 lines
4.3 KiB
C++
123 lines
4.3 KiB
C++
//===--- Overrides.cpp - Compat override table for Swift 5.0 runtime ------===//
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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 - 2020 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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// This file provides compatibility override hooks for Swift 5.0 runtimes.
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//
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//===----------------------------------------------------------------------===//
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#include "Overrides.h"
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#include "../Compatibility51/Overrides.h"
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#include "CompatibilityOverride.h"
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#include <dlfcn.h>
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#include <mach-o/dyld.h>
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#include <mach-o/getsect.h>
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using namespace swift;
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struct OverrideSection {
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uintptr_t version;
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#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
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Override_ ## name name;
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#include "CompatibilityOverride.def"
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};
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wmissing-designated-field-initializers"
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OverrideSection Swift50Overrides
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__attribute__((used, section("__DATA,__swift_hooks"))) = {
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.version = 0,
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.conformsToProtocol = swift50override_conformsToProtocol,
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// We use the same hook for conformsToSwiftProtocol as we do for a 5.1
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// runtime, so reference the override from the Compatibility51 library.
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// If we're back deploying to Swift 5.0, we also have to support 5.1, so
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// the Compatibility51 library is always linked when the 50 library is.
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.conformsToSwiftProtocol = swift51override_conformsToSwiftProtocol,
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};
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#pragma clang diagnostic pop
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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_$_swiftCompatibility50 = 0;
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// Put a getClass hook in front of the system Swift runtime's hook to prevent it
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// from trying to interpret symbolic references. rdar://problem/55036306
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// FIXME: delete this #if and dlsym once we don't
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// need to build with older libobjc headers
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#if !OBJC_GETCLASSHOOK_DEFINED
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using objc_hook_getClass = BOOL(*)(const char * _Nonnull name,
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Class _Nullable * _Nonnull outClass);
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#endif
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static objc_hook_getClass OldGetClassHook;
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static BOOL
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getObjCClassByMangledName_untrusted(const char * _Nonnull typeName,
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Class _Nullable * _Nonnull outClass) {
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// Scan the string for byte sequences that might be recognized as
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// symbolic references, and reject them.
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for (const char *c = typeName; *c != 0; ++c) {
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if (*c >= 1 && *c < 0x20) {
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*outClass = Nil;
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return NO;
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}
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}
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if (OldGetClassHook) {
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return OldGetClassHook(typeName, outClass);
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}
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// In case the OS runtime for some reason didn't install a hook, fallback to
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// NO.
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return NO;
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}
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#if __POINTER_WIDTH__ == 64
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using mach_header_platform = mach_header_64;
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#else
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using mach_header_platform = mach_header;
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#endif
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SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN
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__attribute__((constructor))
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static void installGetClassHook_untrusted() {
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extern char __dso_handle[];
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// swiftCompatibility* might be linked into multiple dynamic libraries because
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// of build system reasons, but the copy in the main executable is the only
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// one that should count. Bail early unless we're running out of the main
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// executable.
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auto machHeader = (const mach_header_platform *)__dso_handle;
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if (machHeader->filetype != MH_EXECUTE)
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return;
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// FIXME: delete this #if and dlsym once we don't
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// need to build with older libobjc headers
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#if !OBJC_GETCLASSHOOK_DEFINED
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using objc_hook_getClass = BOOL(*)(const char * _Nonnull name,
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Class _Nullable * _Nonnull outClass);
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auto objc_setHook_getClass =
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(void(*)(objc_hook_getClass _Nonnull,
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objc_hook_getClass _Nullable * _Nonnull))
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dlsym(RTLD_DEFAULT, "objc_setHook_getClass");
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#endif
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunguarded-availability"
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if (&objc_setHook_getClass) {
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objc_setHook_getClass(getObjCClassByMangledName_untrusted,
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&OldGetClassHook);
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}
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#pragma clang diagnostic pop
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}
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SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END
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