mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
//===--- Overrides.cpp - Compat override table for Swift 5.0 runtime ------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2017 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file provides compatibility override hooks for Swift 5.0 runtimes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "Overrides.h"
|
|
#include "../../public/runtime/CompatibilityOverride.h"
|
|
|
|
#include <dlfcn.h>
|
|
|
|
using namespace swift;
|
|
|
|
struct OverrideSection {
|
|
uintptr_t version;
|
|
#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
|
|
Override_ ## name name;
|
|
#include "../../public/runtime/CompatibilityOverride.def"
|
|
};
|
|
|
|
OverrideSection Overrides
|
|
__attribute__((used, section("__DATA,__swift_hooks"))) = {
|
|
.version = 0,
|
|
.conformsToProtocol = swift50override_conformsToProtocol,
|
|
};
|
|
|
|
// Allow this library to get force-loaded by autolinking
|
|
__attribute__((weak, visibility("hidden")))
|
|
extern "C"
|
|
char _swift_FORCE_LOAD_$_swiftCompatibility50 = 0;
|
|
|
|
// Put a getClass hook in front of the system Swift runtime's hook to prevent it
|
|
// from trying to interpret symbolic references. rdar://problem/55036306
|
|
|
|
// FIXME: delete this #if and dlsym once we don't
|
|
// need to build with older libobjc headers
|
|
#if !OBJC_GETCLASSHOOK_DEFINED
|
|
using objc_hook_getClass = BOOL(*)(const char * _Nonnull name,
|
|
Class _Nullable * _Nonnull outClass);
|
|
#endif
|
|
static objc_hook_getClass OldGetClassHook;
|
|
|
|
static BOOL
|
|
getObjCClassByMangledName_untrusted(const char * _Nonnull typeName,
|
|
Class _Nullable * _Nonnull outClass) {
|
|
// Scan the string for byte sequences that might be recognized as
|
|
// symbolic references, and reject them.
|
|
for (const char *c = typeName; *c != 0; ++c) {
|
|
if (*c >= 1 && *c < 0x20) {
|
|
*outClass = Nil;
|
|
return NO;
|
|
}
|
|
}
|
|
|
|
if (OldGetClassHook) {
|
|
return OldGetClassHook(typeName, outClass);
|
|
}
|
|
// In case the OS runtime for some reason didn't install a hook, fallback to
|
|
// NO.
|
|
return NO;
|
|
}
|
|
|
|
__attribute__((constructor))
|
|
static void installGetClassHook_untrusted() {
|
|
// FIXME: delete this #if and dlsym once we don't
|
|
// need to build with older libobjc headers
|
|
#if !OBJC_GETCLASSHOOK_DEFINED
|
|
using objc_hook_getClass = BOOL(*)(const char * _Nonnull name,
|
|
Class _Nullable * _Nonnull outClass);
|
|
auto objc_setHook_getClass =
|
|
(void(*)(objc_hook_getClass _Nonnull,
|
|
objc_hook_getClass _Nullable * _Nonnull))
|
|
dlsym(RTLD_DEFAULT, "objc_setHook_getClass");
|
|
#endif
|
|
|
|
#pragma clang diagnostic push
|
|
#pragma clang diagnostic ignored "-Wunguarded-availability"
|
|
if (objc_setHook_getClass) {
|
|
objc_setHook_getClass(getObjCClassByMangledName_untrusted,
|
|
&OldGetClassHook);
|
|
}
|
|
#pragma clang diagnostic pop
|
|
}
|