runtime/objc-file.h

   1 /*
   2  * Copyright (c) 2009 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef _OBJC_FILE_NEW_H
  25 #define _OBJC_FILE_NEW_H
  26
  27 #if __OBJC2__
  28
  29 #include "objc-runtime-new.h"
  30
  31 // classref_t is not fixed up at launch; use remapClass() to convert
  32
  33 extern SEL *_getObjc2SelectorRefs(const header_info *hi, size_t *count);
  34 extern message_ref_t *_getObjc2MessageRefs(const header_info *hi, size_t *count);
  35 extern Class*_getObjc2ClassRefs(const header_info *hi, size_t *count);
  36 extern Class*_getObjc2SuperRefs(const header_info *hi, size_t *count);
  37 extern classref_t *_getObjc2ClassList(const header_info *hi, size_t *count);
  38 extern classref_t *_getObjc2NonlazyClassList(const header_info *hi, size_t *count);
  39 extern category_t **_getObjc2CategoryList(const header_info *hi, size_t *count);
  40 extern category_t **_getObjc2NonlazyCategoryList(const header_info *hi, size_t *count);
  41 extern protocol_t **_getObjc2ProtocolList(const header_info *hi, size_t *count);
  42 extern protocol_t **_getObjc2ProtocolRefs(const header_info *hi, size_t *count);
  43
  44 // FIXME: rdar://29241917&33734254 clang doesn't sign static initializers.
  45 struct UnsignedInitializer {
  46 private:
  47     uintptr_t storage;
  48 public:
  49     void operator () () const {
  50         using Initializer = void(*)();
  51         Initializer init =
  52             ptrauth_sign_unauthenticated((Initializer)storage,
  53                                          ptrauth_key_function_pointer, 0);
  54         init();
  55     }
  56 };
  57
  58 extern UnsignedInitializer *getLibobjcInitializers(const header_info *hi, size_t *count);
  59
  60 extern classref_t *_getObjc2NonlazyClassList(const headerType *mhdr, size_t *count);
  61 extern category_t **_getObjc2NonlazyCategoryList(const headerType *mhdr, size_t *count);
  62 extern UnsignedInitializer *getLibobjcInitializers(const headerType *mhdr, size_t *count);
  63
  64 static inline void
  65 foreach_data_segment(const headerType *mhdr,
  66                      std::function<void(const segmentType *, intptr_t slide)> code)
  67 {
  68     intptr_t slide = 0;
  69
  70     // compute VM slide
  71     const segmentType *seg = (const segmentType *) (mhdr + 1);
  72     for (unsigned long i = 0; i < mhdr->ncmds; i++) {
  73         if (seg->cmd == SEGMENT_CMD  &&
  74             segnameEquals(seg->segname, "__TEXT"))
  75         {
  76             slide = (char *)mhdr - (char *)seg->vmaddr;
  77             break;
  78         }
  79         seg = (const segmentType *)((char *)seg + seg->cmdsize);
  80     }
  81
  82     // enumerate __DATA* segments
  83     seg = (const segmentType *) (mhdr + 1);
  84     for (unsigned long i = 0; i < mhdr->ncmds; i++) {
  85         if (seg->cmd == SEGMENT_CMD  &&
  86             segnameStartsWith(seg->segname, "__DATA"))
  87         {
  88             code(seg, slide);
  89         }
  90         seg = (const segmentType *)((char *)seg + seg->cmdsize);
  91     }
  92 }
  93
  94 #endif
  95
  96 #endif