launch-cache/dyld_shared_cache_util.cpp

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2009-2012 Apple Inc. All rights reserved.
   4  *
   5  * @APPLE_LICENSE_HEADER_START@
   6  *
   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  19  * Please see the License for the specific language governing rights and
  20  * limitations under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <sys/stat.h>
  28 #include <string.h>
  29 #include <dlfcn.h>
  30 #include <fcntl.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <sys/mman.h>
  34 #include <sys/syslimits.h>
  35 #include <mach-o/arch.h>
  36 #include <mach-o/loader.h>
  37 #include <mach-o/dyld.h>
  38 #include <mach-o/dyld_priv.h>
  39 #include <mach/mach.h>
  40
  41 #include <map>
  42 #include <vector>
  43
  44 #include "DyldSharedCache.h"
  45
  46 #include "dsc_iterator.h"
  47 #include "dsc_extractor.h"
  48 #include "dyld_cache_format.h"
  49 #include "Architectures.hpp"
  50 #include "MachOFileAbstraction.hpp"
  51 #include "CacheFileAbstraction.hpp"
  52 #include "Trie.hpp"
  53 #include "SupportedArchs.h"
  54
  55 enum Mode {
  56         modeNone,
  57         modeList,
  58         modeMap,
  59         modeDependencies,
  60         modeSlideInfo,
  61     modeVerboseSlideInfo,
  62         modeAcceleratorInfo,
  63         modeTextInfo,
  64         modeLinkEdit,
  65         modeLocalSymbols,
  66     modeStrings,
  67         modeInfo,
  68         modeSize,
  69         modeExtract
  70 };
  71
  72 struct Options {
  73         Mode            mode;
  74         const char*     dependentsOfPath;
  75         const void*     mappedCache;
  76         const char*     extractionDir;
  77         bool            printUUIDs;
  78         bool            printVMAddrs;
  79     bool                printDylibVersions;
  80         bool            printInodes;
  81 };
  82
  83 struct TextInfo {
  84         uint64_t                textSize;
  85         const char*             path;
  86 };
  87
  88 struct TextInfoSorter {
  89         bool operator()(const TextInfo& left, const TextInfo& right) {
  90                 return (left.textSize > right.textSize);
  91         }
  92 };
  93
  94 struct Results {
  95         std::map<uint32_t, const char*> pageToContent;
  96         uint64_t                                                linkeditBase;
  97         bool                                                    dependentTargetFound;
  98         std::vector<TextInfo>                   textSegments;
  99 };
 100
 101
 102 // mmap() an shared cache file read/only but laid out like it would be at runtime
 103 static const DyldSharedCache* mapCacheFile(const char* path, size_t& cacheLength)
 104 {
 105     struct stat statbuf;
 106     if ( ::stat(path, &statbuf) ) {
 107         fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", path);
 108         return nullptr;
 109     }
 110
 111     int cache_fd = ::open(path, O_RDONLY);
 112     if (cache_fd < 0) {
 113         fprintf(stderr, "Error: failed to open shared cache file at %s\n", path);
 114         return nullptr;
 115     }
 116
 117     uint8_t  firstPage[4096];
 118     if ( ::pread(cache_fd, firstPage, 4096, 0) != 4096 ) {
 119         fprintf(stderr, "Error: failed to read shared cache file at %s\n", path);
 120         return nullptr;
 121     }
 122     const dyld_cache_header*       header   = (dyld_cache_header*)firstPage;
 123     const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(firstPage + header->mappingOffset);
 124
 125     size_t vmSize = (size_t)(mappings[2].address + mappings[2].size - mappings[0].address);
 126     vm_address_t result;
 127     kern_return_t r = ::vm_allocate(mach_task_self(), &result, vmSize, VM_FLAGS_ANYWHERE);
 128     if ( r != KERN_SUCCESS ) {
 129         fprintf(stderr, "Error: failed to allocate space to load shared cache file at %s\n", path);
 130         return nullptr;
 131     }
 132     for (int i=0; i < 3; ++i) {
 133         void* mapped_cache = ::mmap((void*)(result + mappings[i].address - mappings[0].address), (size_t)mappings[i].size,
 134                                     PROT_READ, MAP_FIXED | MAP_PRIVATE, cache_fd, mappings[i].fileOffset);
 135         if (mapped_cache == MAP_FAILED) {
 136             fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", path, errno);
 137             return nullptr;
 138         }
 139     }
 140     ::close(cache_fd);
 141
 142     cacheLength = statbuf.st_size;
 143
 144     return (DyldSharedCache*)result;
 145 }
 146
 147
 148
 149 void usage() {
 150         fprintf(stderr, "Usage: dyld_shared_cache_util -list [ -uuid ] [-vmaddr] | -dependents <dylib-path> [ -versions ] | -linkedit | -map | -slide_info | -verbose_slide_info | -info | -extract <dylib-dir>  [ shared-cache-file ] \n");
 151 }
 152
 153 #if __x86_64__
 154 static bool isHaswell()
 155 {
 156         // check system is capable of running x86_64h code
 157         struct host_basic_info info;
 158         mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
 159         mach_port_t hostPort = mach_host_self();
 160         kern_return_t result = host_info(hostPort, HOST_BASIC_INFO, (host_info_t)&info, &count);
 161         mach_port_deallocate(mach_task_self(), hostPort);
 162         if ( result != KERN_SUCCESS )
 163                 return false;
 164         return ( info.cpu_subtype == CPU_SUBTYPE_X86_64_H );
 165 }
 166 #endif
 167
 168 /*
 169  * Get the path to the native shared cache for this host
 170  */
 171 static const char* default_shared_cache_path() {
 172 #if __i386__
 173         return MACOSX_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "i386";
 174 #elif __x86_64__
 175         if ( isHaswell() )
 176                 return MACOSX_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "x86_64h";
 177         else
 178                 return MACOSX_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "x86_64";
 179 #elif __ARM_ARCH_5TEJ__
 180         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv5";
 181 #elif __ARM_ARCH_6K__
 182         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv6";
 183 #elif __ARM_ARCH_7K__
 184         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv7k";
 185 #elif __ARM_ARCH_7A__
 186         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv7";
 187 #elif __ARM_ARCH_7F__
 188         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv7f";
 189 #elif __ARM_ARCH_7S__
 190         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "armv7s";
 191 #elif __ARM64_ARCH_8_32__
 192         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "arm64_32";
 193 #elif __arm64e__
 194         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "arm64e";
 195 #elif __arm64__
 196         return IPHONE_DYLD_SHARED_CACHE_DIR DYLD_SHARED_CACHE_BASE_NAME "arm64";
 197 #else
 198         #error unsupported architecture
 199 #endif
 200 }
 201
 202 typedef void (*segment_callback_t)(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo,
 203                                                                         const Options& options, Results& results);
 204
 205
 206
 207 /*
 208  * List dependencies from the mach-o header at headerAddr
 209  * in the same format as 'otool -L'
 210  */
 211 template <typename A>
 212 void print_dependencies(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo,
 213                                                                                                                                         const Options& options, Results& results) {
 214         typedef typename A::P           P;
 215         typedef typename A::P::E        E;
 216
 217         if ( strcmp(options.dependentsOfPath, dylibInfo->path) != 0 )
 218                 return;
 219         if ( strcmp(segInfo->name, "__TEXT") != 0 )
 220                 return;
 221
 222         const macho_dylib_command<P>* dylib_cmd;
 223         const macho_header<P>* mh = (const macho_header<P>*)dylibInfo->machHeader;
 224         const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uintptr_t)dylibInfo->machHeader + sizeof(macho_header<P>));
 225         const uint32_t cmd_count = mh->ncmds();
 226         const macho_load_command<P>* cmd = cmds;
 227         for (uint32_t i = 0; i < cmd_count; ++i) {
 228                 switch ( cmd->cmd() ) {
 229                         case LC_LOAD_DYLIB:
 230                         case LC_ID_DYLIB:
 231                         case LC_REEXPORT_DYLIB:
 232                         case LC_LOAD_WEAK_DYLIB:
 233                         case LC_LOAD_UPWARD_DYLIB:
 234                                 dylib_cmd = (macho_dylib_command<P>*)cmd;
 235                                 if ( options.printDylibVersions ) {
 236                                         uint32_t compat_vers = dylib_cmd->compatibility_version();
 237                                         uint32_t current_vers = dylib_cmd->current_version();
 238                                         printf("\t%s", dylib_cmd->name());
 239                                         if ( compat_vers != 0xFFFFFFFF ) {
 240                                                 printf("(compatibility version %u.%u.%u, current version %u.%u.%u)\n",
 241                                                    (compat_vers >> 16),
 242                                                    (compat_vers >> 8) & 0xff,
 243                                                    (compat_vers) & 0xff,
 244                                                    (current_vers >> 16),
 245                                                    (current_vers >> 8) & 0xff,
 246                                                    (current_vers) & 0xff);
 247                                         }
 248                                         else {
 249                                                 printf("\n");
 250                                         }
 251                                 }
 252                                 else {
 253                                         printf("\t%s\n", dylib_cmd->name());
 254                                 }
 255                                 break;
 256                 }
 257                 cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
 258         }
 259         results.dependentTargetFound = true;
 260 }
 261
 262 /*
 263  * Print out a dylib from the shared cache, optionally including the UUID or unslid load address
 264  */
 265 template <typename A>
 266 void print_list(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo,
 267                                                                                                                                                 const Options& options, Results& results)
 268 {
 269         if ( strcmp(segInfo->name, "__TEXT") != 0 )
 270                 return;
 271
 272         if ( options.printVMAddrs )
 273                 printf("0x%08llX ", segInfo->address);
 274         if ( options.printInodes )
 275                 printf("0x%08llX 0x%08llX ", dylibInfo->inode, dylibInfo->modTime);
 276         if ( options.printUUIDs ) {
 277                 if ( dylibInfo->uuid != NULL ) {
 278                         const uint8_t* uuid = (uint8_t*)dylibInfo->uuid;;
 279                         printf("<%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X> ",
 280                                 uuid[0],  uuid[1],  uuid[2],  uuid[3],
 281                                         uuid[4],  uuid[5],  uuid[6],  uuid[7],
 282                                 uuid[8],  uuid[9],  uuid[10], uuid[11],
 283                                         uuid[12], uuid[13], uuid[14], uuid[15]);
 284                 }
 285             else
 286                         printf("<     no uuid in dylib               > ");
 287     }
 288         if ( dylibInfo->isAlias )
 289                 printf("[alias] %s\n", dylibInfo->path);
 290         else
 291                 printf("%s\n", dylibInfo->path);
 292 }
 293
 294
 295 template <typename A>
 296 void collect_size(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo,
 297                                                                                                                                                 const Options& options, Results& results)
 298 {
 299         if ( strcmp(segInfo->name, "__TEXT") != 0 )
 300                 return;
 301         if ( dylibInfo->isAlias )
 302                 return;
 303
 304         TextInfo info;
 305         info.textSize = segInfo->fileSize;
 306         info.path = dylibInfo->path;
 307         results.textSegments.push_back(info);
 308 }
 309
 310
 311
 312
 313 static void add_linkedit(uint32_t pageStart, uint32_t pageEnd, const char* message, Results& results)
 314 {
 315         for (uint32_t p = pageStart; p <= pageEnd; p += 4096) {
 316                 std::map<uint32_t, const char*>::iterator pos = results.pageToContent.find(p);
 317                 if ( pos == results.pageToContent.end() ) {
 318                         results.pageToContent[p] = strdup(message);
 319                 }
 320                 else {
 321                         const char* oldMessage = pos->second;
 322                         char* newMesssage;
 323                         asprintf(&newMesssage, "%s, %s", oldMessage, message);
 324                         results.pageToContent[p] = newMesssage;
 325                         ::free((void*)oldMessage);
 326                 }
 327         }
 328 }
 329
 330
 331 /*
 332  * get LINKEDIT info for dylib
 333  */
 334 template <typename A>
 335 void process_linkedit(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo,
 336                                                                                                                                                         const Options& options, Results& results) {
 337         typedef typename A::P           P;
 338         typedef typename A::P::E        E;
 339         // filter out symlinks
 340         if ( dylibInfo->isAlias )
 341                 return;
 342         const macho_header<P>* mh = (const macho_header<P>*)dylibInfo->machHeader;
 343         uint32_t ncmds = mh->ncmds();
 344         const macho_load_command<P>* const cmds = (macho_load_command<P>*)((long)mh + sizeof(macho_header<P>));
 345         const macho_load_command<P>* cmd = cmds;
 346         for (uint32_t i = 0; i < ncmds; i++) {
 347                 if ( cmd->cmd() == LC_DYLD_INFO_ONLY ) {
 348                         macho_dyld_info_command<P>* dyldInfo = (macho_dyld_info_command<P>*)cmd;
 349                         char message[1000];
 350                         const char* shortName = strrchr(dylibInfo->path, '/') + 1;
 351                         // add export trie info
 352                         if ( dyldInfo->export_size() != 0 ) {
 353                                 //printf("export_off=0x%X\n", dyldInfo->export_off());
 354                                 uint32_t exportPageOffsetStart = dyldInfo->export_off() & (-4096);
 355                                 uint32_t exportPageOffsetEnd = (dyldInfo->export_off() + dyldInfo->export_size()) & (-4096);
 356                                 sprintf(message, "exports from %s", shortName);
 357                                 add_linkedit(exportPageOffsetStart, exportPageOffsetEnd, message, results);
 358                         }
 359                         // add binding info
 360                         if ( dyldInfo->bind_size() != 0 ) {
 361                                 uint32_t bindPageOffsetStart = dyldInfo->bind_off() & (-4096);
 362                                 uint32_t bindPageOffsetEnd = (dyldInfo->bind_off() + dyldInfo->bind_size()) & (-4096);
 363                                 sprintf(message, "bindings from %s", shortName);
 364                                 add_linkedit(bindPageOffsetStart, bindPageOffsetEnd, message, results);
 365                         }
 366                         // add lazy binding info
 367                         if ( dyldInfo->lazy_bind_size() != 0 ) {
 368                                 uint32_t lazybindPageOffsetStart = dyldInfo->lazy_bind_off() & (-4096);
 369                                 uint32_t lazybindPageOffsetEnd = (dyldInfo->lazy_bind_off() + dyldInfo->lazy_bind_size()) & (-4096);
 370                                 sprintf(message, "lazy bindings from %s", shortName);
 371                                 add_linkedit(lazybindPageOffsetStart, lazybindPageOffsetEnd, message, results);
 372                         }
 373                         // add weak binding info
 374                         if ( dyldInfo->weak_bind_size() != 0 ) {
 375                                 uint32_t weakbindPageOffsetStart = dyldInfo->weak_bind_off() & (-4096);
 376                                 uint32_t weakbindPageOffsetEnd = (dyldInfo->weak_bind_off() + dyldInfo->weak_bind_size()) & (-4096);
 377                                 sprintf(message, "weak bindings from %s", shortName);
 378                                 add_linkedit(weakbindPageOffsetStart, weakbindPageOffsetEnd, message, results);
 379                         }
 380                 }
 381                 cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
 382         }
 383 }
 384
 385
 386 /*
 387  * Print out a .map file similar to what update_dyld_shared_cache created when the cache file was built
 388  */
 389 template <typename A>
 390 void print_map(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo, const Options& options, Results& results) {
 391         if ( !dylibInfo->isAlias )
 392                 printf("0x%08llX - 0x%08llX %s %s\n", segInfo->address, segInfo->address + segInfo->fileSize, segInfo->name, dylibInfo->path);
 393 }
 394
 395
 396 static void checkMode(Mode mode) {
 397         if ( mode != modeNone ) {
 398                 fprintf(stderr, "Error: select one of: -list, -dependents, -info, -slide_info, -verbose_slide_info, -linkedit, -map, -extract, or -size\n");
 399                 usage();
 400                 exit(1);
 401         }
 402 }
 403
 404 int main (int argc, const char* argv[]) {
 405
 406         const char* sharedCachePath = default_shared_cache_path();
 407
 408         Options options;
 409         options.mode = modeNone;
 410     options.printUUIDs = false;
 411         options.printVMAddrs = false;
 412     options.printDylibVersions = false;
 413         options.printInodes = false;
 414     options.dependentsOfPath = NULL;
 415     options.extractionDir = NULL;
 416
 417     bool printStrings = false;
 418     bool printExports = false;
 419
 420     for (uint32_t i = 1; i < argc; i++) {
 421         const char* opt = argv[i];
 422         if (opt[0] == '-') {
 423             if (strcmp(opt, "-list") == 0) {
 424                                 checkMode(options.mode);
 425                                 options.mode = modeList;
 426             }
 427                         else if (strcmp(opt, "-dependents") == 0) {
 428                                 checkMode(options.mode);
 429                                 options.mode = modeDependencies;
 430                                 options.dependentsOfPath = argv[++i];
 431                 if ( i >= argc ) {
 432                     fprintf(stderr, "Error: option -depdendents requires an argument\n");
 433                     usage();
 434                     exit(1);
 435                 }
 436             }
 437                         else if (strcmp(opt, "-linkedit") == 0) {
 438                                 checkMode(options.mode);
 439                                 options.mode = modeLinkEdit;
 440                         }
 441                         else if (strcmp(opt, "-info") == 0) {
 442                                 checkMode(options.mode);
 443                                 options.mode = modeInfo;
 444                         }
 445                         else if (strcmp(opt, "-slide_info") == 0) {
 446                                 checkMode(options.mode);
 447                                 options.mode = modeSlideInfo;
 448                         }
 449             else if (strcmp(opt, "-verbose_slide_info") == 0) {
 450                 checkMode(options.mode);
 451                 options.mode = modeVerboseSlideInfo;
 452             }
 453                         else if (strcmp(opt, "-accelerator_info") == 0) {
 454                                 checkMode(options.mode);
 455                                 options.mode = modeAcceleratorInfo;
 456                         }
 457                         else if (strcmp(opt, "-text_info") == 0) {
 458                                 checkMode(options.mode);
 459                                 options.mode = modeTextInfo;
 460                         }
 461             else if (strcmp(opt, "-local_symbols") == 0) {
 462                 checkMode(options.mode);
 463                 options.mode = modeLocalSymbols;
 464             }
 465             else if (strcmp(opt, "-strings") == 0) {
 466                 if (options.mode != modeStrings)
 467                     checkMode(options.mode);
 468                 options.mode = modeStrings;
 469                 printStrings = true;
 470             }
 471             else if (strcmp(opt, "-exports") == 0) {
 472                 if (options.mode != modeStrings)
 473                     checkMode(options.mode);
 474                 options.mode = modeStrings;
 475                 printExports = true;
 476             }
 477                         else if (strcmp(opt, "-map") == 0) {
 478                                 checkMode(options.mode);
 479                                 options.mode = modeMap;
 480             }
 481                         else if (strcmp(opt, "-size") == 0) {
 482                                 checkMode(options.mode);
 483                                 options.mode = modeSize;
 484             }
 485                         else if (strcmp(opt, "-extract") == 0) {
 486                                 checkMode(options.mode);
 487                                 options.mode = modeExtract;
 488                                 options.extractionDir = argv[++i];
 489                 if ( i >= argc ) {
 490                     fprintf(stderr, "Error: option -extract requires a directory argument\n");
 491                     usage();
 492                     exit(1);
 493                 }
 494            }
 495                         else if (strcmp(opt, "-uuid") == 0) {
 496                 options.printUUIDs = true;
 497             }
 498                         else if (strcmp(opt, "-inode") == 0) {
 499                 options.printInodes = true;
 500             }
 501                         else if (strcmp(opt, "-versions") == 0) {
 502                 options.printDylibVersions = true;
 503             }
 504                         else if (strcmp(opt, "-vmaddr") == 0) {
 505                                 options.printVMAddrs = true;
 506                     }
 507                         else {
 508                 fprintf(stderr, "Error: unrecognized option %s\n", opt);
 509                 usage();
 510                 exit(1);
 511             }
 512         }
 513                 else {
 514             sharedCachePath = opt;
 515         }
 516     }
 517
 518         if ( options.mode == modeNone ) {
 519                 fprintf(stderr, "Error: select one of -list, -dependents, -info, -linkedit, or -map\n");
 520                 usage();
 521                 exit(1);
 522         }
 523
 524         if ( options.mode != modeSlideInfo &&  options.mode != modeVerboseSlideInfo ) {
 525                 if ( options.printUUIDs && (options.mode != modeList) )
 526                         fprintf(stderr, "Warning: -uuid option ignored outside of -list mode\n");
 527
 528                 if ( options.printVMAddrs && (options.mode != modeList) )
 529                         fprintf(stderr, "Warning: -vmaddr option ignored outside of -list mode\n");
 530
 531                 if ( options.printDylibVersions && (options.mode != modeDependencies) )
 532                         fprintf(stderr, "Warning: -versions option ignored outside of -dependents mode\n");
 533
 534                 if ( (options.mode == modeDependencies) && (options.dependentsOfPath == NULL) ) {
 535                         fprintf(stderr, "Error: -dependents given, but no dylib path specified\n");
 536                         usage();
 537                         exit(1);
 538                 }
 539         }
 540
 541     const DyldSharedCache* dyldCache = nullptr;
 542     bool dyldCacheIsLive = true;
 543     size_t cacheLength = 0;
 544     if ( sharedCachePath != nullptr ) {
 545         dyldCache = mapCacheFile(sharedCachePath, cacheLength);
 546         dyldCacheIsLive = false;
 547     }
 548     else {
 549 #if __MAC_OS_X_VERSION_MIN_REQUIRED && (__MAC_OS_X_VERSION_MIN_REQUIRED < 101300)
 550         fprintf(stderr, "this tool needs to run on macOS 10.13 or later\n");
 551         return 1;
 552 #else
 553         dyldCache = (DyldSharedCache*)_dyld_get_shared_cache_range(&cacheLength);
 554 #endif
 555     }
 556
 557     options.mappedCache = dyldCache;
 558
 559         if ( options.mode == modeSlideInfo || options.mode == modeVerboseSlideInfo ) {
 560                 const dyldCacheHeader<LittleEndian>* header = (dyldCacheHeader<LittleEndian>*)options.mappedCache;
 561                 if ( header->slideInfoOffset() == 0 ) {
 562                         fprintf(stderr, "Error: dyld shared cache does not contain slide info\n");
 563                         exit(1);
 564                 }
 565                 const dyldCacheFileMapping<LittleEndian>* mappings = (dyldCacheFileMapping<LittleEndian>*)((char*)options.mappedCache + header->mappingOffset());
 566         const dyldCacheFileMapping<LittleEndian>* textMapping = &mappings[0];
 567                 const dyldCacheFileMapping<LittleEndian>* dataMapping = &mappings[1];
 568         const dyldCacheFileMapping<LittleEndian>* linkEditMapping = &mappings[2];
 569                 uint64_t dataStartAddress = dataMapping->address();
 570                 uint64_t dataSize = dataMapping->size();
 571         uint64_t slideInfoMappedOffset = (header->slideInfoOffset()-linkEditMapping->file_offset()) + (linkEditMapping->address() - textMapping->address());
 572                 const dyldCacheSlideInfo<LittleEndian>* slideInfoHeader = (dyldCacheSlideInfo<LittleEndian>*)((char*)options.mappedCache+slideInfoMappedOffset);
 573                 printf("slide info version=%d\n", slideInfoHeader->version());
 574                 if ( slideInfoHeader->version() == 1 ) {
 575                         printf("toc_count=%d, data page count=%lld\n", slideInfoHeader->toc_count(), dataSize/4096);
 576                         const dyldCacheSlideInfoEntry* entries = (dyldCacheSlideInfoEntry*)((char*)slideInfoHeader + slideInfoHeader->entries_offset());
 577                         for(int i=0; i < slideInfoHeader->toc_count(); ++i) {
 578                                 printf("0x%08llX: [% 5d,% 5d] ", dataStartAddress + i*4096, i, slideInfoHeader->toc(i));
 579                                 const dyldCacheSlideInfoEntry* entry = &entries[slideInfoHeader->toc(i)];
 580                                 for(int j=0; j < slideInfoHeader->entries_size(); ++j)
 581                                         printf("%02X", entry->bits[j]);
 582                                 printf("\n");
 583                         }
 584                 }
 585                 else if ( slideInfoHeader->version() == 2 ) {
 586                         const dyldCacheSlideInfo2<LittleEndian>* slideInfo = (dyldCacheSlideInfo2<LittleEndian>*)(slideInfoHeader);
 587                         printf("page_size=%d\n", slideInfo->page_size());
 588                         printf("delta_mask=0x%016llX\n", slideInfo->delta_mask());
 589                         printf("value_add=0x%016llX\n", slideInfo->value_add());
 590                         printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count(), slideInfo->page_extras_count());
 591                         const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset());
 592                         const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset());
 593                         for (int i=0; i < slideInfo->page_starts_count(); ++i) {
 594                                 const uint16_t start = starts[i];
 595                 auto rebaseChain = [&](uint8_t* pageContent, uint16_t startOffset)
 596                 {
 597                     uintptr_t slideAmount = 0;
 598                     const uintptr_t   deltaMask    = (uintptr_t)(slideInfo->delta_mask());
 599                     const uintptr_t   valueMask    = ~deltaMask;
 600                     const uintptr_t   valueAdd     = (uintptr_t)(slideInfo->value_add());
 601                     const unsigned    deltaShift   = __builtin_ctzll(deltaMask) - 2;
 602
 603                     uint32_t pageOffset = startOffset;
 604                     uint32_t delta = 1;
 605                     while ( delta != 0 ) {
 606                         uint8_t* loc = pageContent + pageOffset;
 607                         uintptr_t rawValue = *((uintptr_t*)loc);
 608                         delta = (uint32_t)((rawValue & deltaMask) >> deltaShift);
 609                         uintptr_t value = (rawValue & valueMask);
 610                         if ( value != 0 ) {
 611                             value += valueAdd;
 612                             value += slideAmount;
 613                         }
 614                         printf("    [% 5d + 0x%04llX]: 0x%016llX\n", i, (uint64_t)(pageOffset), (uint64_t)rawValue);
 615                         pageOffset += delta;
 616                     }
 617                 };
 618                 const uint8_t* dataPagesStart = (uint8_t*)((char*)options.mappedCache + dataMapping->file_offset());
 619                                 if ( start == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) {
 620                                         printf("page[% 5d]: no rebasing\n", i);
 621                                 }
 622                                 else if ( start & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) {
 623                                         printf("page[% 5d]: ", i);
 624                                         int j=(start & 0x3FFF);
 625                                         bool done = false;
 626                                         do {
 627                                                 uint16_t aStart = extras[j];
 628                                                 printf("start=0x%04X ", aStart & 0x3FFF);
 629                         if ( options.mode == modeVerboseSlideInfo ) {
 630                             uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size()*i));
 631                             uint16_t pageStartOffset = (aStart & 0x3FFF)*4;
 632                             rebaseChain(page, pageStartOffset);
 633                         }
 634                                                 done = (extras[j] & DYLD_CACHE_SLIDE_PAGE_ATTR_END);
 635                                                 ++j;
 636                                         } while ( !done );
 637                                         printf("\n");
 638                                 }
 639                                 else {
 640                                         printf("page[% 5d]: start=0x%04X\n", i, starts[i]);
 641                     if ( options.mode == modeVerboseSlideInfo ) {
 642                         uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size()*i));
 643                         uint16_t pageStartOffset = start*4;
 644                         rebaseChain(page, pageStartOffset);
 645                     }
 646                                 }
 647                         }
 648                 }
 649         else if ( slideInfoHeader->version() == 3 ) {
 650             const dyldCacheSlideInfo3<LittleEndian>* slideInfo = (dyldCacheSlideInfo3<LittleEndian>*)(slideInfoHeader);
 651             printf("page_size=%d\n", slideInfo->page_size());
 652             printf("page_starts_count=%d\n", slideInfo->page_starts_count());
 653             printf("auth_value_add=0x%016llX\n", slideInfo->auth_value_add());
 654             const uint8_t* dataSegmentStart = (uint8_t*)((char*)options.mappedCache + dataMapping->file_offset());
 655             for (int i=0; i < slideInfo->page_starts_count(); ++i) {
 656                 const uint16_t start = slideInfo->page_starts(i);
 657                 if ( start == 0xFFFF ) {
 658                     printf("page[% 5d]: no rebasing\n", i);
 659                 }
 660                 else {
 661                     printf("page[% 5d]: start=0x%04X\n", i, start);
 662                     if ( options.mode == modeVerboseSlideInfo ) {
 663                         typedef Pointer64<LittleEndian> P;
 664                         typedef typename P::uint_t      pint_t;
 665                         const uint8_t* pageStart = dataSegmentStart + (i * slideInfo->page_size());
 666                         pint_t delta = start;
 667                         const uint8_t* rebaseLocation = pageStart;
 668                         do {
 669                             rebaseLocation += delta;
 670                             pint_t value = (pint_t)P::getP(*(uint64_t*)rebaseLocation);
 671                             delta = ( (value & 0x3FF8000000000000) >> 51) * sizeof(pint_t);
 672
 673                             // Regular pointer which needs to fit in 51-bits of value.
 674                             // C++ RTTI uses the top bit, so we'll allow the whole top-byte
 675                             // and the signed-extended bottom 43-bits to be fit in to 51-bits.
 676                             uint64_t top8Bits = value & 0x007F80000000000ULL;
 677                             uint64_t bottom43Bits = value & 0x000007FFFFFFFFFFULL;
 678                             uint64_t targetValue = ( top8Bits << 13 ) | (((intptr_t)(bottom43Bits << 21) >> 21) & 0x00FFFFFFFFFFFFFF);
 679                             printf("    [% 5d + 0x%04llX]: 0x%016llX\n", i, (uint64_t)(rebaseLocation - pageStart), targetValue);
 680                         } while (delta != 0);
 681                     }
 682                 }
 683             }
 684         }
 685         else if ( slideInfoHeader->version() == 4 ) {
 686             const dyld_cache_slide_info4* slideInfo = (dyld_cache_slide_info4*)(slideInfoHeader);
 687             printf("page_size=%d\n", slideInfo->page_size);
 688             printf("delta_mask=0x%016llX\n", slideInfo->delta_mask);
 689             printf("value_add=0x%016llX\n", slideInfo->value_add);
 690             printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count, slideInfo->page_extras_count);
 691             const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset);
 692             const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset);
 693             for (int i=0; i < slideInfo->page_starts_count; ++i) {
 694                 const uint16_t start = starts[i];
 695                 auto rebaseChainV4 = [&](uint8_t* pageContent, uint16_t startOffset)
 696                 {
 697                     uintptr_t slideAmount = 0;
 698                     const uintptr_t   deltaMask    = (uintptr_t)(slideInfo->delta_mask);
 699                     const uintptr_t   valueMask    = ~deltaMask;
 700                     const uintptr_t   valueAdd     = (uintptr_t)(slideInfo->value_add);
 701                     const unsigned    deltaShift   = __builtin_ctzll(deltaMask) - 2;
 702
 703                     uint32_t pageOffset = startOffset;
 704                     uint32_t delta = 1;
 705                     while ( delta != 0 ) {
 706                         uint8_t* loc = pageContent + pageOffset;
 707                         uint32_t rawValue = *((uint32_t*)loc);
 708                         delta = (uint32_t)((rawValue & deltaMask) >> deltaShift);
 709                         uintptr_t value = (rawValue & valueMask);
 710                         if ( (value & 0xFFFF8000) == 0 ) {
 711                             // small positive non-pointer, use as-is
 712                         }
 713                         else if ( (value & 0x3FFF8000) == 0x3FFF8000 ) {
 714                             // small negative non-pointer
 715                             value |= 0xC0000000;
 716                         }
 717                         else  {
 718                             value += valueAdd;
 719                             value += slideAmount;
 720                         }
 721                         printf("    [% 5d + 0x%04X]: 0x%08X\n", i, pageOffset, rawValue);
 722                         pageOffset += delta;
 723                     }
 724                 };
 725                 const uint8_t* dataPagesStart = (uint8_t*)((char*)options.mappedCache + dataMapping->file_offset());
 726                 if ( start == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE ) {
 727                     printf("page[% 5d]: no rebasing\n", i);
 728                 }
 729                 else if ( start & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA ) {
 730                     printf("page[% 5d]: ", i);
 731                     int j=(start & DYLD_CACHE_SLIDE4_PAGE_INDEX);
 732                     bool done = false;
 733                     do {
 734                         uint16_t aStart = extras[j];
 735                         printf("start=0x%04X ", aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX);
 736                         if ( options.mode == modeVerboseSlideInfo ) {
 737                             uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i));
 738                             uint16_t pageStartOffset = (aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX)*4;
 739                             rebaseChainV4(page, pageStartOffset);
 740                         }
 741                         done = (extras[j] & DYLD_CACHE_SLIDE4_PAGE_EXTRA_END);
 742                         ++j;
 743                     } while ( !done );
 744                     printf("\n");
 745                 }
 746                 else {
 747                     printf("page[% 5d]: start=0x%04X\n", i, starts[i]);
 748                     if ( options.mode == modeVerboseSlideInfo ) {
 749                         uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i));
 750                         uint16_t pageStartOffset = start*4;
 751                         rebaseChainV4(page, pageStartOffset);
 752                     }
 753                 }
 754             }
 755         }
 756         return 0;
 757         }
 758
 759     if ( options.mode == modeInfo ) {
 760                 const dyldCacheHeader<LittleEndian>* header = (dyldCacheHeader<LittleEndian>*)options.mappedCache;
 761                 printf("uuid: ");
 762                 if ( header->mappingOffset() >= 0x68 ) {
 763                         const uint8_t* uuid = header->uuid();
 764                         printf("%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
 765                                    uuid[0],  uuid[1],  uuid[2],  uuid[3],
 766                                    uuid[4],  uuid[5],  uuid[6],  uuid[7],
 767                                    uuid[8],  uuid[9],  uuid[10], uuid[11],
 768                                    uuid[12], uuid[13], uuid[14], uuid[15]);
 769                 }
 770                 else {
 771                         printf("n/a\n");
 772                 }
 773                 if ( header->mappingOffset() >= 0xE0 ) {
 774             // HACK until this uses new header
 775             uint32_t platform = *((uint32_t*)(((char*)header) + 0xD8));
 776             uint32_t bitfield = *((uint32_t*)(((char*)header) + 0xDC));
 777             uint32_t simulator = bitfield & 0x200;
 778             uint32_t locallyBuiltCache = bitfield & 0x400;
 779             switch (platform) {
 780                 case 1:
 781                     printf("platform: macOS\n");
 782                     break;
 783                 case 2:
 784                     if ( simulator )
 785                         printf("platform: iOS simulator\n");
 786                     else
 787                         printf("platform: iOS\n");
 788                     break;
 789                 case 3:
 790                     if ( simulator )
 791                         printf("platform: tvOS simulator\n");
 792                     else
 793                         printf("platform: tvOS\n");
 794                     break;
 795                 case 4:
 796                     if ( simulator )
 797                         printf("platform: watchOS simulator\n");
 798                     else
 799                         printf("platform: watchOS\n");
 800                     break;
 801                 case 5:
 802                     printf("platform: bridgeOS\n");
 803                     break;
 804                 default:
 805                     printf("platform: 0x%08X 0x%08X\n", platform, simulator);
 806             }
 807             printf("built by: %s\n", locallyBuiltCache ? "local machine" : "B&I");
 808         }
 809                 printf("image count: %u\n", header->imagesCount());
 810                 if ( (header->mappingOffset() >= 0x78) && (header->branchPoolsOffset() != 0) ) {
 811                         printf("branch pool count:  %u\n", header->branchPoolsCount());
 812                 }
 813                 printf("mappings:\n");
 814                 const dyldCacheFileMapping<LittleEndian>* mappings = (dyldCacheFileMapping<LittleEndian>*)((char*)options.mappedCache + header->mappingOffset());
 815                 for (uint32_t i=0; i < header->mappingCount(); ++i) {
 816                         if ( mappings[i].init_prot() & VM_PROT_EXECUTE )
 817                                 printf("    __TEXT      %3lluMB,  file offset: 0x%08llX -> 0x%08llX,  address: 0x%08llX -> 0x%08llX\n",
 818                                                 mappings[i].size()/(1024*1024), mappings[i].file_offset(), mappings[i].file_offset() + mappings[i].size(),
 819                                                                                                             mappings[i].address(), mappings[i].address() + mappings[i].size());
 820                         else if ( mappings[i]. init_prot() & VM_PROT_WRITE )
 821                                 printf("    __DATA      %3lluMB,  file offset: 0x%08llX -> 0x%08llX,  address: 0x%08llX -> 0x%08llX\n",
 822                                                 mappings[i].size()/(1024*1024), mappings[i].file_offset(), mappings[i].file_offset() + mappings[i].size(),
 823                                                                                                             mappings[i].address(), mappings[i].address() + mappings[i].size());
 824                         else if ( mappings[i].init_prot() & VM_PROT_READ )
 825                                 printf("    __LINKEDIT  %3lluMB,  file offset: 0x%08llX -> 0x%08llX,  address: 0x%08llX -> 0x%08llX\n",
 826                                                 mappings[i].size()/(1024*1024), mappings[i].file_offset(), mappings[i].file_offset() + mappings[i].size(),
 827                                                                                                             mappings[i].address(), mappings[i].address() + mappings[i].size());
 828                 }
 829                 if ( header->codeSignatureOffset() != 0 ) {
 830                         uint64_t size = cacheLength - header->codeSignatureOffset();
 831                         uint64_t csAddr = mappings[header->mappingCount()-1].address() + mappings[header->mappingCount()-1].size();
 832                         if ( size != 0 )
 833                                 printf("    code sign   %3lluMB,  file offset: 0x%08llX -> 0x%08llX,  address: 0x%08llX -> 0x%08llX\n",
 834                                         size/(1024*1024), header->codeSignatureOffset(), header->codeSignatureOffset() + size, csAddr, csAddr + size);
 835                 }
 836                                 printf("slide info:    %4lluKB,  file offset: 0x%08llX -> 0x%08llX\n",
 837                                                 header->slideInfoSize()/1024, header->slideInfoOffset(), header->slideInfoOffset() + header->slideInfoSize());
 838                 if ( header->localSymbolsOffset() != 0 )
 839                         printf("local symbols:  %3lluMB,  file offset: 0x%08llX -> 0x%08llX\n",
 840                                                 header->localSymbolsSize()/(1024*1024), header->localSymbolsOffset(), header->localSymbolsOffset() + header->localSymbolsSize());
 841                 if ( (header->mappingOffset() >= 0x78) && (header->accelerateInfoSize() != 0) )
 842                                 printf("accelerate tab: %3lluKB,                                          address: 0x%08llX -> 0x%08llX\n",
 843                                                 header->accelerateInfoSize()/1024, header->accelerateInfoAddr(), header->accelerateInfoAddr() + header->accelerateInfoSize());
 844         }
 845         else if ( options.mode == modeAcceleratorInfo ) {
 846                 const dyldCacheHeader<LittleEndian>* header = (dyldCacheHeader<LittleEndian>*)options.mappedCache;
 847                 if ( (header->mappingOffset() < sizeof(dyldCacheHeader<LittleEndian>)) || (header->accelerateInfoSize() == 0) ) {
 848                         printf("no accelerator info\n");
 849                 }
 850                 else {
 851                         const dyldCacheFileMapping<LittleEndian>* mappings = (dyldCacheFileMapping<LittleEndian>*)((char*)options.mappedCache + header->mappingOffset());
 852                         uint64_t aiAddr = header->accelerateInfoAddr();
 853                         dyldCacheAcceleratorInfo<LittleEndian>* accelInfo = NULL;
 854                         for (uint32_t i=0; i < header->mappingCount(); ++i) {
 855                                 if ( (mappings[i].address() <= aiAddr) && (aiAddr < mappings[i].address()+mappings[i].size()) ) {
 856                                         uint64_t offset = aiAddr - mappings[i].address() + mappings[i].file_offset();
 857                                         accelInfo = (dyldCacheAcceleratorInfo<LittleEndian>*)((uint8_t*)options.mappedCache + offset);
 858                                 }
 859                         }
 860                         if ( accelInfo == NULL ) {
 861                                 printf("accelerator info not in any mapped range\n");
 862                         }
 863                         else {
 864                                 const dyldCacheImageInfo<LittleEndian>* images = (dyldCacheImageInfo<LittleEndian>*)((char*)options.mappedCache + header->imagesOffset());
 865                                 const dyldCacheImageInfoExtra<LittleEndian>* imagesExtra = (dyldCacheImageInfoExtra<LittleEndian>*)((char*)accelInfo + accelInfo->imagesExtrasOffset());
 866                                 const uint16_t* dependencyArray = (uint16_t*)((char*)accelInfo + accelInfo->depListOffset());
 867                                 const uint16_t* reExportArray = (uint16_t*)((char*)accelInfo + accelInfo->reExportListOffset());
 868                                 printf("extra image info (count=%u):\n", accelInfo->imageExtrasCount());
 869                                 for (uint32_t i=0; i < accelInfo->imageExtrasCount(); ++i) {
 870                                         printf("  image[%3u] %s:\n", i, (char*)options.mappedCache +images[i].pathFileOffset());
 871                                         printf("     exports trie: addr=0x%llX, size=0x%08X\n", imagesExtra[i].exportsTrieAddr(), imagesExtra[i].exportsTrieSize());
 872                                         if ( imagesExtra[i].weakBindingsSize() )
 873                                                 printf("     weak bind info: addr=0x%llX, size=0x%08X\n", imagesExtra[i].weakBindingsAddr(), imagesExtra[i].weakBindingsSize());
 874                                         printf("     dependents: ");
 875                                         for (uint32_t d=imagesExtra[i].dependentsStartArrayIndex(); dependencyArray[d] != 0xFFFF; ++d) {
 876                                                 uint16_t depIndex = dependencyArray[d];
 877                                                 if ( depIndex & 0x8000 )
 878                                                         printf(" up(%d) ", depIndex & 0x7FFF);
 879                                                 else
 880                                                         printf(" %d ", depIndex);
 881                                         }
 882                                         printf("\n");
 883                                         printf("     re-exports: ");
 884                                         for (uint32_t r=imagesExtra[i].reExportsStartArrayIndex(); reExportArray[r] != 0xFFFF; ++r)
 885                                                 printf(" %d ", reExportArray[r]);
 886                                         printf("\n");
 887                                 }
 888                                 printf("libdyld.dylib:\n");
 889                                 printf("   __dyld section address: 0x%llX\n", accelInfo->dyldSectionAddr());
 890                                 printf("initializers (count=%u):\n", accelInfo->initializersCount());
 891                                 const dyldCacheAcceleratorInitializer<LittleEndian>* initializers = (dyldCacheAcceleratorInitializer<LittleEndian>*)((char*)accelInfo + accelInfo->initializersOffset());
 892                                 for (uint32_t i=0; i < accelInfo->initializersCount(); ++i) {
 893                                         printf("  image[%3u] 0x%llX\n", initializers[i].imageIndex(), mappings[0].address() + initializers[i].functionOffset());
 894                                 }
 895                                 printf("DOF sections (count=%u):\n", accelInfo->dofSectionsCount());
 896                                 const dyldCacheAcceleratorDOFEntry<LittleEndian>* dofs = (dyldCacheAcceleratorDOFEntry<LittleEndian>*)((char*)accelInfo + accelInfo->dofSectionsOffset());
 897                                 for (uint32_t i=0; i < accelInfo->dofSectionsCount(); ++i) {
 898                                         printf("  image[%3u] 0x%llX -> 0x%llX\n", dofs[i].imageIndex(), dofs[i].sectionAddress(), dofs[i].sectionAddress()+dofs[i].sectionSize());
 899                                 }
 900                                 printf("bottom up order (count=%u):\n", accelInfo->imageExtrasCount());
 901                                 const uint16_t* bottomUpArray = (uint16_t*)((char*)accelInfo + accelInfo->bottomUpListOffset());
 902                                 for (uint32_t i=0; i < accelInfo->imageExtrasCount(); ++i) {
 903                                         unsigned imageIndex = bottomUpArray[i];
 904                                         if ( imageIndex < accelInfo->imageExtrasCount() )
 905                                                 printf("  image[%3u] %s\n", imageIndex, (char*)options.mappedCache + images[imageIndex].pathFileOffset());
 906                                         else
 907                                                 printf("  image[%3u] BAD INDEX\n", imageIndex);
 908                                 }
 909                                 printf("range table (count=%u):\n", accelInfo->rangeTableCount());
 910                                 const dyldCacheAcceleratorRangeEntry<LittleEndian>* rangeTable = (dyldCacheAcceleratorRangeEntry<LittleEndian>*)((char*)accelInfo + accelInfo->rangeTableOffset());
 911                                 for (uint32_t i=0; i < accelInfo->rangeTableCount(); ++i) {
 912                                         const dyldCacheAcceleratorRangeEntry<LittleEndian>& entry = rangeTable[i];
 913                                         printf("  0x%llX -> 0x%llX %s\n", entry.startAddress(), entry.startAddress() + entry.size(), (char*)options.mappedCache + images[entry.imageIndex()].pathFileOffset());
 914                                 }
 915                                 printf("dylib trie (size=%u):\n", accelInfo->dylibTrieSize());
 916                                 const uint8_t* dylibTrieStart = (uint8_t*)accelInfo + accelInfo->dylibTrieOffset();
 917                                 const uint8_t* dylibTrieEnd = dylibTrieStart + accelInfo->dylibTrieSize();
 918                                 std::vector<DylibIndexTrie::Entry> dylibEntries;
 919                                 if ( !Trie<DylibIndex>::parseTrie(dylibTrieStart, dylibTrieEnd, dylibEntries) )
 920                                         printf("  malformed dylibs trie\n");
 921                                 for (const DylibIndexTrie::Entry& x : dylibEntries) {
 922                                         printf("  image[%3u] %s\n", x.info.index, x.name.c_str());
 923                                 }
 924                         }
 925                 }
 926         }
 927         else if ( options.mode == modeTextInfo ) {
 928                 const dyldCacheHeader<LittleEndian>* header = (dyldCacheHeader<LittleEndian>*)options.mappedCache;
 929                 if ( (header->mappingOffset() < sizeof(dyldCacheHeader<LittleEndian>)) || (header->imagesTextCount() == 0) ) {
 930                         printf("no text info\n");
 931                 }
 932                 else {
 933                         const dyldCacheImageTextInfo<LittleEndian>* imagesText = (dyldCacheImageTextInfo<LittleEndian>*)((char*)options.mappedCache + header->imagesTextOffset());
 934                         const dyldCacheImageTextInfo<LittleEndian>* imagesTextEnd = &imagesText[header->imagesTextCount()];
 935                         printf("dylib text infos (count=%llu):\n", header->imagesTextCount());
 936                         for (const dyldCacheImageTextInfo<LittleEndian>* p=imagesText; p < imagesTextEnd; ++p) {
 937                                 printf("   0x%09llX -> 0x%09llX  <", p->loadAddress(), p->loadAddress() + p->textSegmentSize());
 938                                 for (int i=0; i<16; ++i) {
 939                                         switch (i) {
 940                                                 case 4:
 941                                                 case 6:
 942                                                 case 8:
 943                                                 case 10:
 944                                                         printf("-");
 945                                                         break;
 946                                         }
 947                                         printf("%02X", p->uuid()[i]);
 948                                 }
 949                                 printf(">  %s\n", (char*)options.mappedCache + p->pathOffset());
 950                         }
 951                 }
 952         }
 953         else if ( options.mode == modeLocalSymbols ) {
 954                 const dyldCacheHeader<LittleEndian>* header = (dyldCacheHeader<LittleEndian>*)options.mappedCache;
 955                 if ( header->localSymbolsOffset() == 0 ) {
 956                         fprintf(stderr, "Error: dyld shared cache does not contain local symbols info\n");
 957                         exit(1);
 958                 }
 959                 const bool is64 = (strstr((char*)options.mappedCache, "64") != NULL);
 960                 const dyldCacheImageInfo<LittleEndian>* imageInfos = (dyldCacheImageInfo<LittleEndian>*)((char*)options.mappedCache + header->imagesOffset());
 961                 const dyldCacheLocalSymbolsInfo<LittleEndian>* localsInfo = (dyldCacheLocalSymbolsInfo<LittleEndian>*)((char*)options.mappedCache + header->localSymbolsOffset());
 962                 const uint32_t nlistFileOffset = (uint32_t)(header->localSymbolsOffset() + localsInfo->nlistOffset());
 963                 const uint32_t nlistCount = localsInfo->nlistCount();
 964                 const uint32_t nlistByteSize = is64 ? nlistCount*16 : nlistCount*12;
 965                 const uint32_t stringsFileOffset = (uint32_t)(header->localSymbolsOffset() + localsInfo->stringsOffset());
 966                 const uint32_t stringsSize = localsInfo->stringsSize();
 967                 const uint32_t entriesCount = localsInfo->entriesCount();
 968                 const dyldCacheLocalSymbolEntry<LittleEndian>* entries = (dyldCacheLocalSymbolEntry<LittleEndian>*)((char*)localsInfo + localsInfo->entriesOffset());
 969                 printf("local symbols nlist array:  %3uMB,  file offset: 0x%08X -> 0x%08X\n", nlistByteSize/(1024*1024), nlistFileOffset, nlistFileOffset+nlistByteSize);
 970                 printf("local symbols string pool:  %3uMB,  file offset: 0x%08X -> 0x%08X\n", stringsSize/(1024*1024), stringsFileOffset, stringsFileOffset+stringsSize);
 971                 printf("local symbols by dylib (count=%d):\n", entriesCount);
 972                 //const char* stringPool = (char*)options.mappedCache + stringsFileOffset;
 973                 for (int i=0; i < entriesCount; ++i) {
 974                         const char* imageName = (char*)options.mappedCache + imageInfos[i].pathFileOffset();
 975                         printf("   nlistStartIndex=%5d, nlistCount=%5d, image=%s\n", entries[i].nlistStartIndex(), entries[i].nlistCount(), imageName);
 976                 #if 0
 977                         if ( is64 ) {
 978                                 const nlist_64* symTab = (nlist_64*)((char*)options.mappedCache + nlistFileOffset);
 979                                 for (int e=0; e < entries[i].nlistCount(); ++e) {
 980                                         const nlist_64* entry = &symTab[entries[i].nlistStartIndex()+e];
 981                                         printf("     nlist[%d].str=%d, %s\n", e, entry->n_un.n_strx, &stringPool[entry->n_un.n_strx]);
 982                                         printf("     nlist[%d].value=0x%0llX\n", e, entry->n_value);
 983                                 }
 984                         }
 985                 #endif
 986                 }
 987         }
 988     else if ( options.mode == modeStrings ) {
 989         if (printStrings) {
 990             dyldCache->forEachImage(^(const mach_header *mh, const char *installName) {
 991                 const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh;
 992                 int64_t slide = ma->getSlide();
 993                 ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) {
 994                     if ( ( (info.sectFlags & SECTION_TYPE) == S_CSTRING_LITERALS ) ) {
 995                         if ( malformedSectionRange ) {
 996                             stop = true;
 997                             return;
 998                         }
 999                         const uint8_t* content = (uint8_t*)(info.sectAddr + slide);
1000                         const char* s   = (char*)content;
1001                         const char* end = s + info.sectSize;
1002                         while ( s < end ) {
1003                             printf("%s: %s\n", ma->installName(), s);
1004                             while (*s != '\0' )
1005                                 ++s;
1006                             ++s;
1007                         }
1008                     }
1009                 });
1010             });
1011         }
1012
1013         if (printExports) {
1014             dyldCache->forEachImage(^(const mach_header *mh, const char *installName) {
1015                 const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh;
1016                 uint32_t exportTrieRuntimeOffset;
1017                 uint32_t exportTrieSize;
1018                 if ( ma->hasExportTrie(exportTrieRuntimeOffset, exportTrieSize) ) {
1019                     const uint8_t* start = (uint8_t*)mh + exportTrieRuntimeOffset;
1020                     const uint8_t* end = start + exportTrieSize;
1021                     std::vector<ExportInfoTrie::Entry> exports;
1022                     if ( !ExportInfoTrie::parseTrie(start, end, exports) ) {
1023                         return;
1024                     }
1025
1026                     for (const ExportInfoTrie::Entry& entry: exports) {
1027                         printf("%s: %s\n", ma->installName(), entry.name.c_str());
1028                     }
1029                 }
1030             });
1031         }
1032     }
1033         else if ( options.mode == modeExtract ) {
1034                 char pathBuffer[PATH_MAX];
1035                 uint32_t bufferSize = PATH_MAX;
1036                 if ( _NSGetExecutablePath(pathBuffer, &bufferSize) != 0 ) {
1037                         fprintf(stderr, "Error: could not get path of program\n");
1038                         return 1;
1039                 }
1040                 char* last = strrchr(pathBuffer, '/');
1041                 strcpy(last+1, "../../lib/dsc_extractor.bundle");
1042                 void* handle = dlopen(pathBuffer, RTLD_LAZY);
1043                 if ( handle == NULL ) {
1044                         fprintf(stderr, "Error: dsc_extractor.bundle could not be loaded at %s\n", pathBuffer);
1045                         return 1;
1046                 }
1047
1048                 typedef int (*extractor_proc)(const char* shared_cache_file_path, const char* extraction_root_path,
1049                                                                           void (^progress)(unsigned current, unsigned total));
1050
1051                 extractor_proc proc = (extractor_proc)dlsym(handle, "dyld_shared_cache_extract_dylibs_progress");
1052                 if ( proc == NULL ) {
1053                         fprintf(stderr, "Error: dsc_extractor.bundle did not have dyld_shared_cache_extract_dylibs_progress symbol\n");
1054                         return 1;
1055                 }
1056
1057                 int result = (*proc)(sharedCachePath, options.extractionDir, ^(unsigned c, unsigned total) { } );
1058                 return result;
1059         }
1060         else {
1061                 segment_callback_t callback = nullptr;
1062                 if ( strcmp((char*)options.mappedCache, "dyld_v1    i386") == 0 ) {
1063                         switch ( options.mode ) {
1064                                 case modeList:
1065                                         callback = print_list<x86>;
1066                                         break;
1067                                 case modeMap:
1068                                         callback = print_map<x86>;
1069                                         break;
1070                                 case modeDependencies:
1071                                         callback = print_dependencies<x86>;
1072                                         break;
1073                                 case modeLinkEdit:
1074                                         callback = process_linkedit<x86>;
1075                                         break;
1076                                 case modeSize:
1077                                         callback = collect_size<x86>;
1078                                         break;
1079                                 case modeNone:
1080                                 case modeInfo:
1081                 case modeSlideInfo:
1082                 case modeVerboseSlideInfo:
1083                                 case modeAcceleratorInfo:
1084                                 case modeTextInfo:
1085                                 case modeLocalSymbols:
1086                 case modeStrings:
1087                                 case modeExtract:
1088                                         break;
1089                         }
1090                 }
1091                 else if (  (strcmp((char*)options.mappedCache, "dyld_v1  x86_64") == 0)
1092                                 || (strcmp((char*)options.mappedCache, "dyld_v1 x86_64h") == 0) ) {
1093                         switch ( options.mode ) {
1094                                 case modeList:
1095                                         callback = print_list<x86_64>;
1096                                         break;
1097                                 case modeMap:
1098                                         callback = print_map<x86_64>;
1099                                         break;
1100                                 case modeDependencies:
1101                                         callback = print_dependencies<x86_64>;
1102                                         break;
1103                                 case modeLinkEdit:
1104                                         callback = process_linkedit<x86_64>;
1105                                         break;
1106                                 case modeSize:
1107                                         callback = collect_size<x86_64>;
1108                                         break;
1109                                 case modeNone:
1110                                 case modeInfo:
1111                 case modeSlideInfo:
1112                 case modeVerboseSlideInfo:
1113                                 case modeAcceleratorInfo:
1114                                 case modeTextInfo:
1115                 case modeLocalSymbols:
1116                 case modeStrings:
1117                                 case modeExtract:
1118                                         break;
1119                         }
1120                 }
1121                 else if ( (strncmp((char*)options.mappedCache, "dyld_v1   armv", 14) == 0)
1122                                  || (strncmp((char*)options.mappedCache, "dyld_v1  armv", 13) == 0)
1123 #if SUPPORT_ARCH_arm64_32
1124                                  || (strcmp((char*)options.mappedCache, "dyld_v1arm64_32") == 0)
1125 #endif
1126                  ) {
1127                         switch ( options.mode ) {
1128                                 case modeList:
1129                                         callback = print_list<arm>;
1130                                         break;
1131                                 case modeMap:
1132                                         callback = print_map<arm>;
1133                                         break;
1134                                 case modeDependencies:
1135                                         callback = print_dependencies<arm>;
1136                                         break;
1137                                 case modeLinkEdit:
1138                                         callback = process_linkedit<arm>;
1139                                         break;
1140                                 case modeSize:
1141                                         callback = collect_size<arm>;
1142                                         break;
1143                                 case modeNone:
1144                                 case modeInfo:
1145                 case modeSlideInfo:
1146                 case modeVerboseSlideInfo:
1147                                 case modeAcceleratorInfo:
1148                                 case modeTextInfo:
1149                 case modeLocalSymbols:
1150                 case modeStrings:
1151                                 case modeExtract:
1152                                         break;
1153                         }
1154                 }
1155                 else if ( (strcmp((char*)options.mappedCache, "dyld_v1   arm64") == 0)
1156 #if SUPPORT_ARCH_arm64e
1157                || (strcmp((char*)options.mappedCache, "dyld_v1  arm64e") == 0)
1158 #endif
1159                  ) {
1160                         switch ( options.mode ) {
1161                                 case modeList:
1162                                         callback = print_list<arm64>;
1163                                         break;
1164                                 case modeMap:
1165                                         callback = print_map<arm64>;
1166                                         break;
1167                                 case modeDependencies:
1168                                         callback = print_dependencies<arm64>;
1169                                         break;
1170                                 case modeLinkEdit:
1171                                         callback = process_linkedit<arm64>;
1172                                         break;
1173                                 case modeSize:
1174                                         callback = collect_size<arm64>;
1175                                         break;
1176                                 case modeNone:
1177                                 case modeInfo:
1178                 case modeSlideInfo:
1179                 case modeVerboseSlideInfo:
1180                                 case modeAcceleratorInfo:
1181                                 case modeTextInfo:
1182                 case modeLocalSymbols:
1183                 case modeStrings:
1184                                 case modeExtract:
1185                                         break;
1186                         }
1187                 }
1188 #if SUPPORT_ARCH_arm64_32
1189                 else if ( (strcmp((char*)options.mappedCache, "dyld_v1arm64_32") == 0) ) {
1190                         switch ( options.mode ) {
1191                                 case modeList:
1192                                         callback = print_list<arm64_32>;
1193                                         break;
1194                                 case modeMap:
1195                                         callback = print_map<arm64_32>;
1196                                         break;
1197                                 case modeDependencies:
1198                                         callback = print_dependencies<arm64_32>;
1199                                         break;
1200                                 case modeLinkEdit:
1201                                         callback = process_linkedit<arm64_32>;
1202                                         break;
1203                                 case modeSize:
1204                                         callback = collect_size<arm64_32>;
1205                                         break;
1206                                 case modeNone:
1207                                 case modeInfo:
1208                                 case modeSlideInfo:
1209                 case modeVerboseSlideInfo:
1210                                 case modeAcceleratorInfo:
1211                                 case modeTextInfo:
1212                 case modeLocalSymbols:
1213                 case modeStrings:
1214                                 case modeExtract:
1215                                         break;
1216                         }
1217                 }
1218 #endif
1219         else {
1220                         fprintf(stderr, "Error: unrecognized dyld shared cache magic.\n");
1221                         exit(1);
1222                 }
1223
1224                 __block Results results;
1225                 results.dependentTargetFound = false;
1226                 int iterateResult = dyld_shared_cache_iterate(options.mappedCache, (uint32_t)cacheLength,
1227                                                                                    ^(const dyld_shared_cache_dylib_info* dylibInfo, const dyld_shared_cache_segment_info* segInfo ) {
1228                                                                                            (callback)(dylibInfo, segInfo, options, results);
1229                                                                                    });
1230                 if ( iterateResult != 0 ) {
1231                         fprintf(stderr, "Error: malformed shared cache file\n");
1232                         exit(1);
1233                 }
1234
1235                 if ( options.mode == modeLinkEdit ) {
1236                         // dump -linkedit information
1237                         for (std::map<uint32_t, const char*>::iterator it = results.pageToContent.begin(); it != results.pageToContent.end(); ++it) {
1238                                 printf("0x%08X %s\n", it->first, it->second);
1239                         }
1240                 }
1241                 else if ( options.mode == modeSize ) {
1242                         std::sort(results.textSegments.begin(), results.textSegments.end(), TextInfoSorter());
1243                         for (std::vector<TextInfo>::iterator it = results.textSegments.begin(); it != results.textSegments.end(); ++it) {
1244                                 printf(" 0x%08llX  %s\n", it->textSize, it->path);
1245                         }
1246                 }
1247
1248                 if ( (options.mode == modeDependencies) && options.dependentsOfPath && !results.dependentTargetFound) {
1249                         fprintf(stderr, "Error: could not find '%s' in the shared cache at\n  %s\n", options.dependentsOfPath, sharedCachePath);
1250                         exit(1);
1251                 }
1252         }
1253         return 0;
1254 }