objc4-750.tar.gz

[apple/objc4.git] / runtime / objc-ptrauth.h

diff --git a/runtime/objc-ptrauth.h b/runtime/objc-ptrauth.h
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+/*
+ * Copyright (c) 2017 Apple Inc.  All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef _OBJC_PTRAUTH_H_
+#define _OBJC_PTRAUTH_H_
+
+#include <objc/objc.h>
+
+// On some architectures, method lists and method caches store signed IMPs.
+
+// StorageSignedFunctionPointer is declared by libclosure.
+#include <Block_private.h>
+
+// fixme simply include ptrauth.h once all build trains have it
+#if __has_include (<ptrauth.h>)
+#include <ptrauth.h>
+#else
+#define ptrauth_strip(__value, __key) __value
+#define ptrauth_blend_discriminator(__pointer, __integer) ((uintptr_t)0)
+#define ptrauth_sign_constant(__value, __key, __data) __value
+#define ptrauth_sign_unauthenticated(__value, __key, __data) __value
+#define ptrauth_auth_and_resign(__value, __old_key, __old_data, __new_key, __new_data) __value
+#define ptrauth_auth_function(__value, __old_key, __old_data) __value
+#define ptrauth_auth_data(__value, __old_key, __old_data) __value
+#define ptrauth_string_discriminator(__string) ((int)0)
+#define ptrauth_sign_generic_data(__value, __data) ((ptrauth_generic_signature_t)0)
+
+#define __ptrauth_function_pointer
+#define __ptrauth_return_address
+#define __ptrauth_block_invocation_pointer
+#define __ptrauth_block_copy_helper
+#define __ptrauth_block_destroy_helper
+#define __ptrauth_block_byref_copy_helper
+#define __ptrauth_block_byref_destroy_helper
+#define __ptrauth_objc_method_list_imp
+#define __ptrauth_cxx_vtable_pointer
+#define __ptrauth_cxx_vtt_vtable_pointer
+#define __ptrauth_swift_heap_object_destructor
+#define __ptrauth_cxx_virtual_function_pointer(__declkey)
+#define __ptrauth_swift_function_pointer(__typekey)
+#define __ptrauth_swift_class_method_pointer(__declkey)
+#define __ptrauth_swift_protocol_witness_function_pointer(__declkey)
+#define __ptrauth_swift_value_witness_function_pointer(__key)
+#endif
+
+
+#if __has_feature(ptrauth_calls)
+
+// Method lists use process-independent signature for compatibility.
+// Method caches use process-dependent signature for extra protection.
+//   (fixme not yet __ptrauth(...) because of `stp` inline asm in objc-cache.mm)
+using MethodListIMP = IMP __ptrauth_objc_method_list_imp;
+using MethodCacheIMP =
+    StorageSignedFunctionPointer<IMP, ptrauth_key_process_dependent_code>;
+
+#else
+
+using MethodListIMP = IMP;
+using MethodCacheIMP = IMP;
+
+#endif
+
+// _OBJC_PTRAUTH_H_
+#endif