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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 | /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- * * Copyright (c) 2009-2012 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@ */ #include <stdio.h> #include <unistd.h> #include <sys/stat.h> #include <string.h> #include <dlfcn.h> #include <fcntl.h> #include <stdlib.h> #include <errno.h> #include <sys/mman.h> #include <sys/syslimits.h> #include <mach-o/arch.h> #include <mach-o/loader.h> #include <mach-o/dyld_priv.h> #include <bootstrap.h> #include <mach/mach.h> #include <dispatch/dispatch.h> #include <uuid/uuid.h> #include <TargetConditionals.h> #include <map> #include <vector> #include <iostream> #include <optional> #include "ClosureBuilder.h" #include "DyldSharedCache.h" #include "ClosureFileSystemPhysical.h" #include "JSONWriter.h" #include "Trie.hpp" #include "dsc_extractor.h" #include "objc-shared-cache.h" #if TARGET_OS_OSX #define DSC_BUNDLE_REL_PATH "../../lib/dsc_extractor.bundle" #else #define DSC_BUNDLE_REL_PATH "../lib/dsc_extractor.bundle" #endif using dyld3::closure::ClosureBuilder; using dyld3::closure::FileSystemPhysical; // mmap() an shared cache file read/only but laid out like it would be at runtime static const DyldSharedCache* mapCacheFile(const char* path) { struct stat statbuf; if ( ::stat(path, &statbuf) ) { fprintf(stderr, "Error: stat failed for dyld shared cache at %s\n", path); return nullptr; } int cache_fd = ::open(path, O_RDONLY); if (cache_fd < 0) { fprintf(stderr, "Error: failed to open shared cache file at %s\n", path); return nullptr; } uint8_t firstPage[4096]; if ( ::pread(cache_fd, firstPage, 4096, 0) != 4096 ) { fprintf(stderr, "Error: failed to read shared cache file at %s\n", path); return nullptr; } const dyld_cache_header* header = (dyld_cache_header*)firstPage; const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)(firstPage + header->mappingOffset); const dyld_cache_mapping_info* lastMapping = &mappings[header->mappingCount - 1]; size_t vmSize = (size_t)(lastMapping->address + lastMapping->size - mappings[0].address); vm_address_t result; kern_return_t r = ::vm_allocate(mach_task_self(), &result, vmSize, VM_FLAGS_ANYWHERE); if ( r != KERN_SUCCESS ) { fprintf(stderr, "Error: failed to allocate space to load shared cache file at %s\n", path); return nullptr; } for (int i=0; i < header->mappingCount; ++i) { void* mapped_cache = ::mmap((void*)(result + mappings[i].address - mappings[0].address), (size_t)mappings[i].size, PROT_READ, MAP_FIXED | MAP_PRIVATE, cache_fd, mappings[i].fileOffset); if (mapped_cache == MAP_FAILED) { fprintf(stderr, "Error: mmap() for shared cache at %s failed, errno=%d\n", path, errno); return nullptr; } } ::close(cache_fd); return (DyldSharedCache*)result; } enum Mode { modeNone, modeList, modeMap, modeDependencies, modeSlideInfo, modeVerboseSlideInfo, modeTextInfo, modeLinkEdit, modeLocalSymbols, modeJSONMap, modeJSONDependents, modeSectionSizes, modeStrings, modeInfo, modeSize, modeObjCProtocols, modeObjCImpCaches, modeObjCClasses, modeObjCSelectors, modeExtract, modePatchTable, modeListDylibsWithSection }; struct Options { Mode mode; const char* dependentsOfPath; const char* extractionDir; const char* segmentName; const char* sectionName; bool printUUIDs; bool printVMAddrs; bool printDylibVersions; bool printInodes; }; void usage() { 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"); } static void checkMode(Mode mode) { if ( mode != modeNone ) { fprintf(stderr, "Error: select one of: -list, -dependents, -info, -slide_info, -verbose_slide_info, -linkedit, -map, -extract, or -size\n"); usage(); exit(1); } } struct SegmentInfo { uint64_t vmAddr; uint64_t vmSize; const char* installName; const char* segName; }; static void buildSegmentInfo(const DyldSharedCache* dyldCache, std::vector<SegmentInfo>& segInfos) { dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; ma->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo& info, bool& stop) { segInfos.push_back({info.vmAddr, info.vmSize, installName, info.segName}); }); }); std::sort(segInfos.begin(), segInfos.end(), [](const SegmentInfo& l, const SegmentInfo& r) -> bool { return l.vmAddr < r.vmAddr; }); } static void printSlideInfoForDataRegion(const DyldSharedCache* dyldCache, uint64_t dataStartAddress, uint64_t dataSize, const uint8_t* dataPagesStart, const dyld_cache_slide_info* slideInfoHeader, bool verboseSlideInfo) { printf("slide info version=%d\n", slideInfoHeader->version); if ( slideInfoHeader->version == 1 ) { printf("toc_count=%d, data page count=%lld\n", slideInfoHeader->toc_count, dataSize/4096); const dyld_cache_slide_info_entry* entries = (dyld_cache_slide_info_entry*)((char*)slideInfoHeader + slideInfoHeader->entries_offset); const uint16_t* tocs = (uint16_t*)((char*)slideInfoHeader + slideInfoHeader->toc_offset); for(int i=0; i < slideInfoHeader->toc_count; ++i) { printf("0x%08llX: [% 5d,% 5d] ", dataStartAddress + i*4096, i, tocs[i]); const dyld_cache_slide_info_entry* entry = &entries[tocs[i]]; for(int j=0; j < slideInfoHeader->entries_size; ++j) printf("%02X", entry->bits[j]); printf("\n"); } } else if ( slideInfoHeader->version == 2 ) { const dyld_cache_slide_info2* slideInfo = (dyld_cache_slide_info2*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("delta_mask=0x%016llX\n", slideInfo->delta_mask); printf("value_add=0x%016llX\n", slideInfo->value_add); printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count, slideInfo->page_extras_count); const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset); const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset); for (int i=0; i < slideInfo->page_starts_count; ++i) { const uint16_t start = starts[i]; auto rebaseChain = [&](uint8_t* pageContent, uint16_t startOffset) { uintptr_t slideAmount = 0; const uintptr_t deltaMask = (uintptr_t)(slideInfo->delta_mask); const uintptr_t valueMask = ~deltaMask; const uintptr_t valueAdd = (uintptr_t)(slideInfo->value_add); const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2; uint32_t pageOffset = startOffset; uint32_t delta = 1; while ( delta != 0 ) { uint8_t* loc = pageContent + pageOffset; uintptr_t rawValue = *((uintptr_t*)loc); delta = (uint32_t)((rawValue & deltaMask) >> deltaShift); uintptr_t value = (rawValue & valueMask); if ( value != 0 ) { value += valueAdd; value += slideAmount; } printf(" [% 5d + 0x%04llX]: 0x%016llX = 0x%016llX\n", i, (uint64_t)(pageOffset), (uint64_t)rawValue, (uint64_t)value); pageOffset += delta; } }; if ( start == DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); } else if ( start & DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA ) { printf("page[% 5d]: ", i); int j=(start & 0x3FFF); bool done = false; do { uint16_t aStart = extras[j]; printf("start=0x%04X ", aStart & 0x3FFF); if ( verboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = (aStart & 0x3FFF)*4; rebaseChain(page, pageStartOffset); } done = (extras[j] & DYLD_CACHE_SLIDE_PAGE_ATTR_END); ++j; } while ( !done ); printf("\n"); } else { printf("page[% 5d]: start=0x%04X\n", i, starts[i]); if ( verboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = start*4; rebaseChain(page, pageStartOffset); } } } } else if ( slideInfoHeader->version == 3 ) { const dyld_cache_slide_info3* slideInfo = (dyld_cache_slide_info3*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("page_starts_count=%d\n", slideInfo->page_starts_count); printf("auth_value_add=0x%016llX\n", slideInfo->auth_value_add); const uintptr_t authValueAdd = (uintptr_t)(slideInfo->auth_value_add); for (int i=0; i < slideInfo->page_starts_count; ++i) { uint16_t delta = slideInfo->page_starts[i]; if ( delta == DYLD_CACHE_SLIDE_V3_PAGE_ATTR_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); continue; } printf("page[% 5d]: start=0x%04X\n", i, delta); if ( !verboseSlideInfo ) continue; delta = delta/sizeof(uint64_t); // initial offset is byte based const uint8_t* pageStart = dataPagesStart + (i * slideInfo->page_size); const dyld_cache_slide_pointer3* loc = (dyld_cache_slide_pointer3*)pageStart; do { loc += delta; delta = loc->plain.offsetToNextPointer; dyld3::MachOLoaded::ChainedFixupPointerOnDisk ptr; ptr.raw64 = *((uint64_t*)loc); if ( loc->auth.authenticated ) { uint64_t target = authValueAdd + loc->auth.offsetFromSharedCacheBase; uint64_t targetValue = ptr.arm64e.signPointer((void*)loc, target); printf(" [% 5d + 0x%04llX]: 0x%016llX (JOP: diversity %d, address %s, %s)\n", i, (uint64_t)((const uint8_t*)loc - pageStart), targetValue, ptr.arm64e.authBind.diversity, ptr.arm64e.authBind.addrDiv ? "true" : "false", ptr.arm64e.keyName()); } else { uint64_t targetValue = ptr.arm64e.unpackTarget(); printf(" [% 5d + 0x%04llX]: 0x%016llX\n", i, (uint64_t)((const uint8_t*)loc - pageStart), targetValue); } } while (delta != 0); } } else if ( slideInfoHeader->version == 4 ) { const dyld_cache_slide_info4* slideInfo = (dyld_cache_slide_info4*)(slideInfoHeader); printf("page_size=%d\n", slideInfo->page_size); printf("delta_mask=0x%016llX\n", slideInfo->delta_mask); printf("value_add=0x%016llX\n", slideInfo->value_add); printf("page_starts_count=%d, page_extras_count=%d\n", slideInfo->page_starts_count, slideInfo->page_extras_count); const uint16_t* starts = (uint16_t* )((char*)slideInfo + slideInfo->page_starts_offset); const uint16_t* extras = (uint16_t* )((char*)slideInfo + slideInfo->page_extras_offset); for (int i=0; i < slideInfo->page_starts_count; ++i) { const uint16_t start = starts[i]; auto rebaseChainV4 = [&](uint8_t* pageContent, uint16_t startOffset) { uintptr_t slideAmount = 0; const uintptr_t deltaMask = (uintptr_t)(slideInfo->delta_mask); const uintptr_t valueMask = ~deltaMask; const uintptr_t valueAdd = (uintptr_t)(slideInfo->value_add); const unsigned deltaShift = __builtin_ctzll(deltaMask) - 2; uint32_t pageOffset = startOffset; uint32_t delta = 1; while ( delta != 0 ) { uint8_t* loc = pageContent + pageOffset; uint32_t rawValue = *((uint32_t*)loc); delta = (uint32_t)((rawValue & deltaMask) >> deltaShift); uintptr_t value = (rawValue & valueMask); if ( (value & 0xFFFF8000) == 0 ) { // small positive non-pointer, use as-is } else if ( (value & 0x3FFF8000) == 0x3FFF8000 ) { // small negative non-pointer value |= 0xC0000000; } else { value += valueAdd; value += slideAmount; } printf(" [% 5d + 0x%04X]: 0x%08X\n", i, pageOffset, rawValue); pageOffset += delta; } }; if ( start == DYLD_CACHE_SLIDE4_PAGE_NO_REBASE ) { printf("page[% 5d]: no rebasing\n", i); } else if ( start & DYLD_CACHE_SLIDE4_PAGE_USE_EXTRA ) { printf("page[% 5d]: ", i); int j=(start & DYLD_CACHE_SLIDE4_PAGE_INDEX); bool done = false; do { uint16_t aStart = extras[j]; printf("start=0x%04X ", aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX); if ( verboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = (aStart & DYLD_CACHE_SLIDE4_PAGE_INDEX)*4; rebaseChainV4(page, pageStartOffset); } done = (extras[j] & DYLD_CACHE_SLIDE4_PAGE_EXTRA_END); ++j; } while ( !done ); printf("\n"); } else { printf("page[% 5d]: start=0x%04X\n", i, starts[i]); if ( verboseSlideInfo ) { uint8_t* page = (uint8_t*)(long)(dataPagesStart + (slideInfo->page_size*i)); uint16_t pageStartOffset = start*4; rebaseChainV4(page, pageStartOffset); } } } } } static void findImageAndSegment(const DyldSharedCache* dyldCache, const std::vector<SegmentInfo>& segInfos, uint32_t cacheOffset, SegmentInfo* found) { const uint64_t locVmAddr = dyldCache->unslidLoadAddress() + cacheOffset; const SegmentInfo target = { locVmAddr, 0, NULL, NULL }; const auto lowIt = std::lower_bound(segInfos.begin(), segInfos.end(), target, [](const SegmentInfo& l, const SegmentInfo& r) -> bool { return l.vmAddr+l.vmSize < r.vmAddr+r.vmSize; }); *found = *lowIt; } int main (int argc, const char* argv[]) { const char* sharedCachePath = nullptr; Options options; options.mode = modeNone; options.printUUIDs = false; options.printVMAddrs = false; options.printDylibVersions = false; options.printInodes = false; options.dependentsOfPath = NULL; options.extractionDir = NULL; bool printStrings = false; bool printExports = false; for (uint32_t i = 1; i < argc; i++) { const char* opt = argv[i]; if (opt[0] == '-') { if (strcmp(opt, "-list") == 0) { checkMode(options.mode); options.mode = modeList; } else if (strcmp(opt, "-dependents") == 0) { checkMode(options.mode); options.mode = modeDependencies; options.dependentsOfPath = argv[++i]; if ( i >= argc ) { fprintf(stderr, "Error: option -depdendents requires an argument\n"); usage(); exit(1); } } else if (strcmp(opt, "-linkedit") == 0) { checkMode(options.mode); options.mode = modeLinkEdit; } else if (strcmp(opt, "-info") == 0) { checkMode(options.mode); options.mode = modeInfo; } else if (strcmp(opt, "-slide_info") == 0) { checkMode(options.mode); options.mode = modeSlideInfo; } else if (strcmp(opt, "-verbose_slide_info") == 0) { checkMode(options.mode); options.mode = modeVerboseSlideInfo; } else if (strcmp(opt, "-text_info") == 0) { checkMode(options.mode); options.mode = modeTextInfo; } else if (strcmp(opt, "-local_symbols") == 0) { checkMode(options.mode); options.mode = modeLocalSymbols; } else if (strcmp(opt, "-strings") == 0) { if (options.mode != modeStrings) checkMode(options.mode); options.mode = modeStrings; printStrings = true; } else if (strcmp(opt, "-sections") == 0) { checkMode(options.mode); options.mode = modeSectionSizes; } else if (strcmp(opt, "-exports") == 0) { if (options.mode != modeStrings) checkMode(options.mode); options.mode = modeStrings; printExports = true; } else if (strcmp(opt, "-map") == 0) { checkMode(options.mode); options.mode = modeMap; } else if (strcmp(opt, "-json-map") == 0) { checkMode(options.mode); options.mode = modeJSONMap; } else if (strcmp(opt, "-json-dependents") == 0) { checkMode(options.mode); options.mode = modeJSONDependents; } else if (strcmp(opt, "-size") == 0) { checkMode(options.mode); options.mode = modeSize; } else if (strcmp(opt, "-objc-protocols") == 0) { checkMode(options.mode); options.mode = modeObjCProtocols; } else if (strcmp(opt, "-objc-imp-caches") == 0) { checkMode(options.mode); options.mode = modeObjCImpCaches; } else if (strcmp(opt, "-objc-classes") == 0) { checkMode(options.mode); options.mode = modeObjCClasses; } else if (strcmp(opt, "-objc-selectors") == 0) { checkMode(options.mode); options.mode = modeObjCSelectors; } else if (strcmp(opt, "-extract") == 0) { checkMode(options.mode); options.mode = modeExtract; options.extractionDir = argv[++i]; if ( i >= argc ) { fprintf(stderr, "Error: option -extract requires a directory argument\n"); usage(); exit(1); } } else if (strcmp(opt, "-uuid") == 0) { options.printUUIDs = true; } else if (strcmp(opt, "-inode") == 0) { options.printInodes = true; } else if (strcmp(opt, "-versions") == 0) { options.printDylibVersions = true; } else if (strcmp(opt, "-vmaddr") == 0) { options.printVMAddrs = true; } else if (strcmp(opt, "-patch_table") == 0) { options.mode = modePatchTable; } else if (strcmp(opt, "-list_dylibs_with_section") == 0) { options.mode = modeListDylibsWithSection; options.segmentName = argv[++i]; options.sectionName = argv[++i]; if ( i >= argc ) { fprintf(stderr, "Error: option -list_dylibs_with_section requires a segment and section name\n"); usage(); exit(1); } } else { fprintf(stderr, "Error: unrecognized option %s\n", opt); usage(); exit(1); } } else { sharedCachePath = opt; } } if ( options.mode == modeNone ) { fprintf(stderr, "Error: select one of -list, -dependents, -info, -linkedit, or -map\n"); usage(); exit(1); } if ( options.mode != modeSlideInfo && options.mode != modeVerboseSlideInfo ) { if ( options.printUUIDs && (options.mode != modeList) ) fprintf(stderr, "Warning: -uuid option ignored outside of -list mode\n"); if ( options.printVMAddrs && (options.mode != modeList) ) fprintf(stderr, "Warning: -vmaddr option ignored outside of -list mode\n"); if ( options.printDylibVersions && (options.mode != modeDependencies) ) fprintf(stderr, "Warning: -versions option ignored outside of -dependents mode\n"); if ( (options.mode == modeDependencies) && (options.dependentsOfPath == NULL) ) { fprintf(stderr, "Error: -dependents given, but no dylib path specified\n"); usage(); exit(1); } } const DyldSharedCache* dyldCache = nullptr; if ( sharedCachePath != nullptr ) { dyldCache = mapCacheFile(sharedCachePath); // mapCacheFile prints an error if something goes wrong, so just return in that case. if ( dyldCache == nullptr ) return 1; } else { size_t cacheLength; dyldCache = (DyldSharedCache*)_dyld_get_shared_cache_range(&cacheLength); if (dyldCache == nullptr) { fprintf(stderr, "Could not get in-memory shared cache\n"); return 1; } if ( options.mode == modeObjCClasses ) { fprintf(stderr, "Cannot use -objc-classes with a live cache. Please run with a path to an on-disk cache file\n"); return 1; } } if ( options.mode == modeSlideInfo || options.mode == modeVerboseSlideInfo ) { if ( !dyldCache->hasSlideInfo() ) { fprintf(stderr, "Error: dyld shared cache does not contain slide info\n"); exit(1); } const bool verboseSlideInfo = (options.mode == modeVerboseSlideInfo); dyldCache->forEachSlideInfo(^(uint64_t mappingStartAddress, uint64_t mappingSize, const uint8_t *mappingPagesStart, uint64_t slideInfoOffset, uint64_t slideInfoSize, const dyld_cache_slide_info *slideInfoHeader) { printSlideInfoForDataRegion(dyldCache, mappingStartAddress, mappingSize, mappingPagesStart, slideInfoHeader, verboseSlideInfo); }); return 0; } else if ( options.mode == modeInfo ) { const dyld_cache_header* header = &dyldCache->header; uuid_string_t uuidString; uuid_unparse_upper(header->uuid, uuidString); printf("uuid: %s\n", uuidString); dyld3::Platform platform = dyldCache->platform(); printf("platform: %s\n", dyld3::MachOFile::platformName(platform)); printf("built by: %s\n", header->locallyBuiltCache ? "local machine" : "B&I"); printf("cache type: %s\n", header->cacheType ? "production" : "development"); printf("image count: %u\n", header->imagesCount); if ( (header->mappingOffset >= 0x78) && (header->branchPoolsOffset != 0) ) { printf("branch pool count: %u\n", header->branchPoolsCount); } if ( dyldCache->hasSlideInfo() ) { uint32_t pageSize = 0x4000; // fix me for intel uint32_t possibleSlideValues = (uint32_t)(header->maxSlide/pageSize); uint32_t entropyBits = 0; if ( possibleSlideValues > 1 ) entropyBits = __builtin_clz(possibleSlideValues - 1); printf("ASLR entropy: %u-bits\n", entropyBits); } printf("mappings:\n"); dyldCache->forEachRegion(^(const void *content, uint64_t vmAddr, uint64_t size, uint32_t initProt, uint32_t maxProt, uint64_t flags) { std::string mappingName = ""; if ( maxProt & VM_PROT_EXECUTE ) { mappingName = "__TEXT"; } else if ( maxProt & VM_PROT_WRITE ) { // Start off with __DATA or __AUTH if ( flags & DYLD_CACHE_MAPPING_AUTH_DATA ) mappingName = "__AUTH"; else mappingName = "__DATA"; // Then add one of "", _DIRTY, or _CONST if ( flags & DYLD_CACHE_MAPPING_DIRTY_DATA ) mappingName += "_DIRTY"; else if ( flags & DYLD_CACHE_MAPPING_CONST_DATA ) mappingName += "_CONST"; } else if ( maxProt & VM_PROT_READ ) { mappingName = "__LINKEDIT"; } else { mappingName = "*unknown*"; } uint64_t fileOffset = (uint8_t*)content - (uint8_t*)dyldCache; printf("%16s %4lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", mappingName.c_str(), size / (1024*1024), fileOffset, fileOffset + size, vmAddr, vmAddr + size); }); if ( header->codeSignatureOffset != 0 ) { uint64_t size = header->codeSignatureSize; uint64_t csAddr = dyldCache->getCodeSignAddress(); if ( size != 0 ) printf("%16s %4lluMB, file offset: 0x%08llX -> 0x%08llX, address: 0x%08llX -> 0x%08llX\n", "code sign", size/(1024*1024), header->codeSignatureOffset, header->codeSignatureOffset + size, csAddr, csAddr + size); } dyldCache->forEachSlideInfo(^(uint64_t mappingStartAddress, uint64_t mappingSize, const uint8_t *mappingPagesStart, uint64_t slideInfoOffset, uint64_t slideInfoSize, const dyld_cache_slide_info *slideInfoHeader) { printf("slide info: %4lluKB, file offset: 0x%08llX -> 0x%08llX\n", slideInfoSize/1024, slideInfoOffset, slideInfoOffset + slideInfoSize); }); if ( header->localSymbolsOffset != 0 ) printf("local symbols: %3lluMB, file offset: 0x%08llX -> 0x%08llX\n", header->localSymbolsSize/(1024*1024), header->localSymbolsOffset, header->localSymbolsOffset + header->localSymbolsSize); } else if ( options.mode == modeTextInfo ) { const dyld_cache_header* header = &dyldCache->header; printf("dylib text infos (count=%llu):\n", header->imagesTextCount); dyldCache->forEachImageTextSegment(^(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const unsigned char *dylibUUID, const char *installName, bool &stop) { uuid_string_t uuidString; uuid_unparse_upper(dylibUUID, uuidString); printf(" 0x%09llX -> 0x%09llX <%s> %s\n", loadAddressUnslid, loadAddressUnslid + textSegmentSize, uuidString, installName); }); } else if ( options.mode == modeLocalSymbols ) { if ( !dyldCache->hasLocalSymbolsInfo() ) { fprintf(stderr, "Error: dyld shared cache does not contain local symbols info\n"); exit(1); } const bool is64 = (strstr(dyldCache->archName(), "64") != NULL); const uint32_t nlistFileOffset = (uint32_t)((uint8_t*)dyldCache->getLocalNlistEntries() - (uint8_t*)dyldCache); const uint32_t nlistCount = dyldCache->getLocalNlistCount(); const uint32_t nlistByteSize = is64 ? nlistCount*16 : nlistCount*12; const char* localStrings = dyldCache->getLocalStrings(); const uint32_t stringsFileOffset = (uint32_t)((uint8_t*)localStrings - (uint8_t*)dyldCache); const uint32_t stringsSize = dyldCache->getLocalStringsSize(); printf("local symbols nlist array: %3uMB, file offset: 0x%08X -> 0x%08X\n", nlistByteSize/(1024*1024), nlistFileOffset, nlistFileOffset+nlistByteSize); printf("local symbols string pool: %3uMB, file offset: 0x%08X -> 0x%08X\n", stringsSize/(1024*1024), stringsFileOffset, stringsFileOffset+stringsSize); __block uint32_t entriesCount = 0; dyldCache->forEachLocalSymbolEntry(^(uint32_t dylibOffset, uint32_t nlistStartIndex, uint32_t nlistCount, bool &stop) { const char* imageName = dyldCache->getIndexedImagePath(entriesCount); printf(" nlistStartIndex=%5d, nlistCount=%5d, image=%s\n", nlistStartIndex, nlistCount, imageName); #if 0 if ( is64 ) { const nlist_64* symTab = (nlist_64*)((char*)dyldCache + nlistFileOffset); for (int e = 0; e < nlistCount; ++e) { const nlist_64* entry = &symTab[nlistStartIndex + e]; printf(" nlist[%d].str=%d, %s\n", e, entry->n_un.n_strx, &localStrings[entry->n_un.n_strx]); printf(" nlist[%d].value=0x%0llX\n", e, entry->n_value); } } #endif entriesCount++; }); printf("local symbols by dylib (count=%d):\n", entriesCount); } else if ( options.mode == modeJSONMap ) { std::string buffer = dyldCache->generateJSONMap("unknown"); printf("%s\n", buffer.c_str()); } else if ( options.mode == modeJSONDependents ) { std::cout << dyldCache->generateJSONDependents(); } else if ( options.mode == modeStrings ) { if (printStrings) { dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; int64_t slide = ma->getSlide(); ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo& info, bool malformedSectionRange, bool& stop) { if ( ( (info.sectFlags & SECTION_TYPE) == S_CSTRING_LITERALS ) ) { if ( malformedSectionRange ) { stop = true; return; } const uint8_t* content = (uint8_t*)(info.sectAddr + slide); const char* s = (char*)content; const char* end = s + info.sectSize; while ( s < end ) { printf("%s: %s\n", ma->installName(), s); while (*s != '\0' ) ++s; ++s; } } }); }); } if (printExports) { dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; uint32_t exportTrieRuntimeOffset; uint32_t exportTrieSize; if ( ma->hasExportTrie(exportTrieRuntimeOffset, exportTrieSize) ) { const uint8_t* start = (uint8_t*)mh + exportTrieRuntimeOffset; const uint8_t* end = start + exportTrieSize; std::vector<ExportInfoTrie::Entry> exports; if ( !ExportInfoTrie::parseTrie(start, end, exports) ) { return; } for (const ExportInfoTrie::Entry& entry: exports) { printf("%s: %s\n", ma->installName(), entry.name.c_str()); } } }); } } else if ( options.mode == modeSectionSizes ) { __block std::map<std::string, uint64_t> sectionSizes; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; ma->forEachSection(^(const dyld3::MachOAnalyzer::SectionInfo §Info, bool malformedSectionRange, bool &stop) { std::string section = std::string(sectInfo.segInfo.segName) + " " + sectInfo.sectName; sectionSizes[section] += sectInfo.sectSize; }); }); for (const auto& keyAndValue : sectionSizes) { printf("%lld %s\n", keyAndValue.second, keyAndValue.first.c_str()); } } else if ( options.mode == modeObjCProtocols ) { if ( dyldCache->objcOpt() == nullptr ) { fprintf(stderr, "Error: could not get optimized objc\n"); return 1; } objc_opt::objc_protocolopt2_t* protocols = dyldCache->objcOpt()->protocolopt2(); if ( protocols == nullptr ) { fprintf(stderr, "Error: could not get optimized objc protocols\n"); return 1; } for (uint64_t index = 0; index != protocols->capacity; ++index) { const objc_opt::objc_classheader_t& clshi = protocols->classOffsets()[index]; if ( clshi.clsOffset == 0 ) { fprintf(stderr, "[% 5lld]\n", index); continue; } const char* name = (const char*)(((const uint8_t*)protocols) + protocols->offsets()[index]); if ( !clshi.isDuplicate() ) { fprintf(stderr, "[% 5lld] -> (% 8d, % 8d) = %s\n", index, clshi.clsOffset, clshi.hiOffset, name); continue; } // class appears in more than one header uint32_t count = clshi.duplicateCount(); fprintf(stderr, "[% 5lld] -> duplicates [% 5d..% 5d] = %s\n", index, clshi.duplicateIndex(), clshi.duplicateIndex() + clshi.duplicateCount() - 1, name); const objc_opt::objc_classheader_t *list = &protocols->duplicateOffsets()[clshi.duplicateIndex()]; for (uint32_t i = 0; i < count; i++) { fprintf(stderr, " - [% 5lld] -> (% 8d, % 8d)\n", (uint64_t)(clshi.duplicateIndex() + i), list[i].clsOffset, list[i].hiOffset); } } } else if ( options.mode == modeObjCClasses ) { using dyld3::json::Node; using dyld3::json::NodeValueType; using ObjCClassInfo = dyld3::MachOAnalyzer::ObjCClassInfo; const bool rebased = false; std::string instancePrefix("-"); std::string classPrefix("+"); auto getString = ^const char *(const dyld3::MachOAnalyzer* ma, uint64_t nameVMAddr){ dyld3::MachOAnalyzer::PrintableStringResult result; const char* name = ma->getPrintableString(nameVMAddr, result); if (result == dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return name; return nullptr; }; // Build a map of class vm addrs to their names so that categories know the // name of the class they are attaching to __block std::unordered_map<uint64_t, const char*> classVMAddrToName; __block std::unordered_map<uint64_t, const char*> metaclassVMAddrToName; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; const uint32_t pointerSize = ma->pointerSize(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { if (auto className = getString(ma, objcClass.nameVMAddr(pointerSize))) { if (isMetaClass) metaclassVMAddrToName[classVMAddr] = className; else classVMAddrToName[classVMAddr] = className; } }; Diagnostics diag; dyld3::MachOAnalyzer::VMAddrConverter vmAddrConverter = dyldCache->makeVMAddrConverter(rebased); ma->forEachObjCClass(diag, vmAddrConverter, visitClass); }); // These are used only for the on-disk binaries we analyze __block std::vector<const char*> onDiskChainedFixupBindTargets; __block std::unordered_map<uint64_t, const char*> onDiskClassVMAddrToName; __block std::unordered_map<uint64_t, const char*> onDiskMetaclassVMAddrToName; auto getProperties = ^(const dyld3::MachOAnalyzer* ma, uint64_t propertiesVMAddr, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { __block Node propertiesNode; auto visitProperty = ^(uint64_t propertyVMAddr, const dyld3::MachOAnalyzer::ObjCProperty& property) { // Get the name && attributes auto propertyName = getString(ma, property.nameVMAddr); auto propertyAttributes = getString(ma, property.attributesVMAddr); if (!propertyName || !propertyAttributes) return; Node propertyNode; propertyNode.map["name"] = Node{propertyName}; propertyNode.map["attributes"] = Node{propertyAttributes}; propertiesNode.array.push_back(propertyNode); }; ma->forEachObjCProperty(propertiesVMAddr, vmAddrConverter, visitProperty); return propertiesNode.array.empty() ? std::optional<Node>() : propertiesNode; }; auto getClassProtocols = ^(const dyld3::MachOAnalyzer* ma, uint64_t protocolsVMAddr, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { __block Node protocolsNode; auto visitProtocol = ^(uint64_t protocolVMAddr, const dyld3::MachOAnalyzer::ObjCProtocol& protocol) { if (const char *name = getString(ma, protocol.nameVMAddr)) { protocolsNode.array.push_back(Node{name}); } }; ma->forEachObjCProtocol(protocolsVMAddr, vmAddrConverter, visitProtocol); return protocolsNode.array.empty() ? std::optional<Node>() : protocolsNode; }; auto getProtocols = ^(const dyld3::MachOAnalyzer* ma, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { __block Node protocols; auto getMethods = ^(const dyld3::MachOAnalyzer* ma, uint64_t methodListVMAddr, const std::string &prefix, Node &node){ auto visitMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { if (auto name = getString(ma, method.nameVMAddr)) { node.array.push_back(Node{prefix + name}); } }; ma->forEachObjCMethod(methodListVMAddr, vmAddrConverter, visitMethod); }; auto visitProtocol = ^(Diagnostics& diag, uint64_t protoVMAddr, const dyld3::MachOAnalyzer::ObjCProtocol& objcProto) { const char* protoName = getString(ma, objcProto.nameVMAddr); if (!protoName) return; Node entry; entry.map["protocolName"] = Node{protoName}; if ( objcProto.protocolsVMAddr != 0 ) { __block Node protocols; auto visitProtocol = ^(uint64_t protocolRefVMAddr, const dyld3::MachOAnalyzer::ObjCProtocol &protocol) { if (auto name = getString(ma, protocol.nameVMAddr)) { protocols.array.push_back(Node{name}); } }; ma->forEachObjCProtocol(objcProto.protocolsVMAddr, vmAddrConverter, visitProtocol); if (!protocols.array.empty()) { entry.map["protocols"] = protocols; } } Node methods; getMethods(ma, objcProto.instanceMethodsVMAddr, instancePrefix, methods); getMethods(ma, objcProto.classMethodsVMAddr, classPrefix, methods); if (!methods.array.empty()) { entry.map["methods"] = methods; } Node optMethods; getMethods(ma, objcProto.optionalInstanceMethodsVMAddr, instancePrefix, optMethods); getMethods(ma, objcProto.optionalClassMethodsVMAddr, classPrefix, optMethods); if (!optMethods.array.empty()) { entry.map["optionalMethods"] = optMethods; } protocols.array.push_back(entry); }; Diagnostics diag; ma->forEachObjCProtocol(diag, vmAddrConverter, visitProtocol); return protocols.array.empty() ? std::optional<Node>() : protocols; }; auto getSelRefs = ^(const dyld3::MachOAnalyzer* ma, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { __block std::vector<const char *> selNames; auto visitSelRef = ^(uint64_t selRefVMAddr, uint64_t selRefTargetVMAddr) { if (auto selValue = getString(ma, selRefTargetVMAddr)) { selNames.push_back(selValue); } }; Diagnostics diag; ma->forEachObjCSelectorReference(diag, vmAddrConverter, visitSelRef); std::sort(selNames.begin(), selNames.end(), [](const char* a, const char* b) { return strcasecmp(a, b) < 0; }); Node selrefs; for (auto s: selNames) { selrefs.array.push_back(Node{s}); } return selrefs.array.empty() ? std::optional<Node>() : selrefs; }; auto getClasses = ^(const dyld3::MachOAnalyzer* ma, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { Diagnostics diag; const uint32_t pointerSize = ma->pointerSize(); // Get the vmAddrs for all exported symbols as we want to know if classes // are exported std::set<uint64_t> exportedSymbolVMAddrs; { uint64_t loadAddress = ma->preferredLoadAddress(); uint32_t exportTrieRuntimeOffset; uint32_t exportTrieSize; if ( ma->hasExportTrie(exportTrieRuntimeOffset, exportTrieSize) ) { const uint8_t* start = (uint8_t*)ma + exportTrieRuntimeOffset; const uint8_t* end = start + exportTrieSize; std::vector<ExportInfoTrie::Entry> exports; if ( ExportInfoTrie::parseTrie(start, end, exports) ) { for (const ExportInfoTrie::Entry& entry: exports) { exportedSymbolVMAddrs.insert(loadAddress + entry.info.address); } } } } __block Node classesNode; __block bool skippedPreviousClass = false; auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { if (isMetaClass) { if (skippedPreviousClass) { // If the class was bad, then skip the meta class too skippedPreviousClass = false; return; } } else { skippedPreviousClass = true; } std::string classType = "-"; if (isMetaClass) classType = "+"; dyld3::MachOAnalyzer::PrintableStringResult classNameResult; const char* className = ma->getPrintableString(objcClass.nameVMAddr(pointerSize), classNameResult); if (classNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) { return; } const char* superClassName = nullptr; if ( ma->inDyldCache() ) { if ( objcClass.superclassVMAddr != 0 ) { if (isMetaClass) { // If we are root class, then our superclass should actually point to our own class const uint32_t RO_ROOT = (1<<1); if ( objcClass.flags(pointerSize) & RO_ROOT ) { auto it = classVMAddrToName.find(objcClass.superclassVMAddr); assert(it != classVMAddrToName.end()); superClassName = it->second; } else { auto it = metaclassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != metaclassVMAddrToName.end()); superClassName = it->second; } } else { auto it = classVMAddrToName.find(objcClass.superclassVMAddr); assert(it != classVMAddrToName.end()); superClassName = it->second; } } } else { // On-disk binary. Lets crack the chain to work out what we are pointing at dyld3::MachOAnalyzer::ChainedFixupPointerOnDisk fixup; fixup.raw64 = objcClass.superclassVMAddr; if (fixup.arm64e.bind.bind) { uint64_t bindOrdinal = fixup.arm64e.authBind.auth ? fixup.arm64e.authBind.ordinal : fixup.arm64e.bind.ordinal; // Bind to another image. Use the bind table to work out which name to bind to const char* symbolName = onDiskChainedFixupBindTargets[bindOrdinal]; if (isMetaClass) { if ( strstr(symbolName, "_OBJC_METACLASS_$_") == symbolName ) { superClassName = symbolName + strlen("_OBJC_METACLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them if (objcClass.isSwiftLegacy || objcClass.isSwiftStable) return; } } else { if ( strstr(symbolName, "_OBJC_CLASS_$_") == symbolName ) { superClassName = symbolName + strlen("_OBJC_CLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them if (objcClass.isSwiftLegacy || objcClass.isSwiftStable) return; } } } else { // Rebase within this image. if (isMetaClass) { auto it = onDiskMetaclassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != onDiskMetaclassVMAddrToName.end()); superClassName = it->second; } else { auto it = onDiskClassVMAddrToName.find(objcClass.superclassVMAddr); assert(it != onDiskClassVMAddrToName.end()); superClassName = it->second; } } } // Print the methods on this class __block Node methodsNode; auto visitMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { dyld3::MachOAnalyzer::PrintableStringResult methodNameResult; const char* methodName = ma->getPrintableString(method.nameVMAddr, methodNameResult); if (methodNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; methodsNode.array.push_back(Node{classType + methodName}); }; ma->forEachObjCMethod(objcClass.baseMethodsVMAddr(pointerSize), vmAddrConverter, visitMethod); std::optional<Node> properties = getProperties(ma, objcClass.basePropertiesVMAddr(pointerSize), vmAddrConverter); if (isMetaClass) { assert(!classesNode.array.empty()); Node& currentClassNode = classesNode.array.back(); assert(currentClassNode.map["className"].value == className); if (!methodsNode.array.empty()) { Node& currentMethodsNode = currentClassNode.map["methods"]; currentMethodsNode.array.insert(currentMethodsNode.array.end(), methodsNode.array.begin(), methodsNode.array.end()); } if (properties.has_value()) { Node& currentPropertiesNode = currentClassNode.map["properties"]; currentPropertiesNode.array.insert(currentPropertiesNode.array.end(), properties->array.begin(), properties->array.end()); } return; } Node currentClassNode; currentClassNode.map["className"] = Node{className}; if ( superClassName != nullptr ) currentClassNode.map["superClassName"] = Node{superClassName}; if (!methodsNode.array.empty()) currentClassNode.map["methods"] = methodsNode; if (properties.has_value()) currentClassNode.map["properties"] = properties.value(); if (std::optional<Node> protocols = getClassProtocols(ma, objcClass.baseProtocolsVMAddr(pointerSize), vmAddrConverter)) currentClassNode.map["protocols"] = protocols.value(); currentClassNode.map["exported"] = Node{exportedSymbolVMAddrs.count(classVMAddr) != 0}; // We didn't skip this class so mark it as such skippedPreviousClass = false; classesNode.array.push_back(currentClassNode); }; ma->forEachObjCClass(diag, vmAddrConverter, visitClass); return classesNode.array.empty() ? std::optional<Node>() : classesNode; }; auto getCategories = ^(const dyld3::MachOAnalyzer* ma, const dyld3::MachOAnalyzer::VMAddrConverter& vmAddrConverter) { Diagnostics diag; __block Node categoriesNode; auto visitCategory = ^(Diagnostics& diag, uint64_t categoryVMAddr, const dyld3::MachOAnalyzer::ObjCCategory& objcCategory) { dyld3::MachOAnalyzer::PrintableStringResult categoryNameResult; const char* categoryName = ma->getPrintableString(objcCategory.nameVMAddr, categoryNameResult); if (categoryNameResult != dyld3::MachOAnalyzer::PrintableStringResult::CanPrint) return; const char* className = nullptr; if ( ma->inDyldCache() ) { auto it = classVMAddrToName.find(objcCategory.clsVMAddr); assert(it != classVMAddrToName.end()); className = it->second; } else { // On-disk binary. Lets crack the chain to work out what we are pointing at dyld3::MachOAnalyzer::ChainedFixupPointerOnDisk fixup; fixup.raw64 = objcCategory.clsVMAddr; if (fixup.arm64e.bind.bind) { uint64_t bindOrdinal = fixup.arm64e.authBind.auth ? fixup.arm64e.authBind.ordinal : fixup.arm64e.bind.ordinal; // Bind to another image. Use the bind table to work out which name to bind to const char* symbolName = onDiskChainedFixupBindTargets[bindOrdinal]; if ( strstr(symbolName, "_OBJC_CLASS_$_") == symbolName ) { className = symbolName + strlen("_OBJC_CLASS_$_"); } else { // Swift classes don't start with these prefixes so just skip them // We don't know that this is a Swift class/category though, but skip it anyway return; } } else { auto it = onDiskClassVMAddrToName.find(objcCategory.clsVMAddr); if (it == onDiskClassVMAddrToName.end()) { // This is an odd binary with perhaps a Swift class. Just skip this entry return; } className = it->second; } } // Print the instance methods on this category __block Node methodsNode; auto visitInstanceMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { if (auto methodName = getString(ma, method.nameVMAddr)) methodsNode.array.push_back(Node{instancePrefix + methodName}); }; ma->forEachObjCMethod(objcCategory.instanceMethodsVMAddr, vmAddrConverter, visitInstanceMethod); // Print the instance methods on this category __block Node classMethodsNode; auto visitClassMethod = ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { if (auto methodName = getString(ma, method.nameVMAddr)) methodsNode.array.push_back(Node{classPrefix + methodName}); }; ma->forEachObjCMethod(objcCategory.classMethodsVMAddr, vmAddrConverter, visitClassMethod); Node currentCategoryNode; currentCategoryNode.map["categoryName"] = Node{categoryName}; currentCategoryNode.map["className"] = Node{className}; if (!methodsNode.array.empty()) currentCategoryNode.map["methods"] = methodsNode; if (std::optional<Node> properties = getProperties(ma, objcCategory.instancePropertiesVMAddr, vmAddrConverter)) currentCategoryNode.map["properties"] = properties.value(); if (std::optional<Node> protocols = getClassProtocols(ma, objcCategory.protocolsVMAddr, vmAddrConverter)) currentCategoryNode.map["protocols"] = protocols.value(); categoriesNode.array.push_back(currentCategoryNode); }; ma->forEachObjCCategory(diag, vmAddrConverter, visitCategory); return categoriesNode.array.empty() ? std::optional<Node>() : categoriesNode; }; __block bool needsComma = false; dyld3::json::streamArrayBegin(needsComma); dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { dyld3::MachOAnalyzer::VMAddrConverter vmAddrConverter = dyldCache->makeVMAddrConverter(rebased); const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; Node imageRecord; imageRecord.map["imagePath"] = Node{installName}; imageRecord.map["imageType"] = Node{"cache-dylib"}; std::optional<Node> classes = getClasses(ma, vmAddrConverter); std::optional<Node> categories = getCategories(ma, vmAddrConverter); std::optional<Node> protocols = getProtocols(ma, vmAddrConverter); std::optional<Node> selrefs = getSelRefs(ma, vmAddrConverter); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value() && !protocols.has_value() && !selrefs.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); if (protocols.has_value()) imageRecord.map["protocols"] = protocols.value(); if (selrefs.has_value()) imageRecord.map["selrefs"] = selrefs.value(); dyld3::json::streamArrayNode(needsComma, imageRecord); }); FileSystemPhysical fileSystem; dyld3::Platform platform = dyldCache->platform(); const dyld3::GradedArchs& archs = dyld3::GradedArchs::forName(dyldCache->archName(), true); dyldCache->forEachLaunchClosure(^(const char *executableRuntimePath, const dyld3::closure::LaunchClosure *closure) { Diagnostics diag; char realerPath[MAXPATHLEN]; dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(diag, fileSystem, executableRuntimePath, archs, platform, realerPath); const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)loadedFileInfo.fileContent; uint32_t pointerSize = ma->pointerSize(); // Populate the bind targets for classes from other images onDiskChainedFixupBindTargets.clear(); ma->forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) { onDiskChainedFixupBindTargets.push_back(symbolName); }); if ( diag.hasError() ) return; // Populate the rebase targets for class names onDiskMetaclassVMAddrToName.clear(); onDiskClassVMAddrToName.clear(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { if (auto className = getString(ma, objcClass.nameVMAddr(pointerSize))) { if (isMetaClass) onDiskMetaclassVMAddrToName[classVMAddr] = className; else onDiskClassVMAddrToName[classVMAddr] = className; } }; // Get a vmAddrConverter for this on-disk binary. We can't use the shared cache one dyld3::MachOAnalyzer::VMAddrConverter onDiskVMAddrConverter = ma->makeVMAddrConverter(rebased); ma->forEachObjCClass(diag, onDiskVMAddrConverter, visitClass); Node imageRecord; imageRecord.map["imagePath"] = Node{executableRuntimePath}; imageRecord.map["imageType"] = Node{"executable"}; std::optional<Node> classes = getClasses(ma, onDiskVMAddrConverter); std::optional<Node> categories = getCategories(ma, onDiskVMAddrConverter); // TODO: protocols std::optional<Node> selrefs = getSelRefs(ma, onDiskVMAddrConverter); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value() && !selrefs.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); if (selrefs.has_value()) imageRecord.map["selrefs"] = selrefs.value(); dyld3::json::streamArrayNode(needsComma, imageRecord); }); dyldCache->forEachDlopenImage(^(const char *runtimePath, const dyld3::closure::Image *image) { Diagnostics diag; char realerPath[MAXPATHLEN]; dyld3::closure::LoadedFileInfo loadedFileInfo = dyld3::MachOAnalyzer::load(diag, fileSystem, runtimePath, archs, platform, realerPath); const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)loadedFileInfo.fileContent; uint32_t pointerSize = ma->pointerSize(); // Populate the bind targets for classes from other images onDiskChainedFixupBindTargets.clear(); ma->forEachChainedFixupTarget(diag, ^(int libOrdinal, const char* symbolName, uint64_t addend, bool weakImport, bool& stop) { onDiskChainedFixupBindTargets.push_back(symbolName); }); if ( diag.hasError() ) return; // Populate the rebase targets for class names onDiskMetaclassVMAddrToName.clear(); onDiskClassVMAddrToName.clear(); auto visitClass = ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { if (auto className = getString(ma, objcClass.nameVMAddr(pointerSize))) { if (isMetaClass) onDiskMetaclassVMAddrToName[classVMAddr] = className; else onDiskClassVMAddrToName[classVMAddr] = className; } }; // Get a vmAddrConverter for this on-disk binary. We can't use the shared cache one dyld3::MachOAnalyzer::VMAddrConverter onDiskVMAddrConverter = ma->makeVMAddrConverter(rebased); ma->forEachObjCClass(diag, onDiskVMAddrConverter, visitClass); Node imageRecord; imageRecord.map["imagePath"] = Node{runtimePath}; imageRecord.map["imageType"] = Node{"non-cache-dylib"}; std::optional<Node> classes = getClasses(ma, onDiskVMAddrConverter); std::optional<Node> categories = getCategories(ma, onDiskVMAddrConverter); // TODO: protocols std::optional<Node> selrefs = getSelRefs(ma, onDiskVMAddrConverter); // Skip emitting images with no objc data if (!classes.has_value() && !categories.has_value() && !selrefs.has_value()) return; if (classes.has_value()) imageRecord.map["classes"] = classes.value(); if (categories.has_value()) imageRecord.map["categories"] = categories.value(); if (selrefs.has_value()) imageRecord.map["selrefs"] = selrefs.value(); dyld3::json::streamArrayNode(needsComma, imageRecord); }); dyld3::json::streamArrayEnd(needsComma); } else if ( options.mode == modeObjCSelectors ) { if ( dyldCache->objcOpt() == nullptr ) { fprintf(stderr, "Error: could not get optimized objc\n"); return 1; } const objc_opt::objc_selopt_t* selectors = dyldCache->objcOpt()->selopt(); if ( selectors == nullptr ) { fprintf(stderr, "Error: could not get optimized objc selectors\n"); return 1; } std::vector<const char*> selNames; for (uint64_t index = 0; index != selectors->capacity; ++index) { objc_opt::objc_stringhash_offset_t offset = selectors->offsets()[index]; if ( offset == 0 ) continue; const char* selName = selectors->getEntryForIndex((uint32_t)index); selNames.push_back(selName); } std::sort(selNames.begin(), selNames.end(), [](const char* a, const char* b) { // Sort by offset, not string value return a < b; }); dyld3::json::Node root; for (const char* selName : selNames) { dyld3::json::Node selNode; selNode.map["selectorName"] = dyld3::json::Node{selName}; selNode.map["offset"] = dyld3::json::Node{(int64_t)selName - (int64_t)dyldCache}; root.array.push_back(selNode); } dyld3::json::printJSON(root, 0, std::cout); } else if ( options.mode == modeExtract ) { return dyld_shared_cache_extract_dylibs(sharedCachePath, options.extractionDir); } else if ( options.mode == modeObjCImpCaches ) { if (sharedCachePath == nullptr) { fprintf(stderr, "Cannot emit imp caches with live cache. Run again with the path to the cache file\n"); return 1; } __block std::map<uint64_t, const char*> methodToClassMap; __block std::map<uint64_t, const char*> classVMAddrToNameMap; const bool contentRebased = false; const uint32_t pointerSize = 8; // Get the base pointers from the magic section in objc __block uint64_t objcCacheOffsetsSize = 0; __block const void* objcCacheOffsets = nullptr; __block Diagnostics diag; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { if ( !strcmp(installName, "/usr/lib/libobjc.A.dylib") ) { const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; objcCacheOffsets = ma->findSectionContent("__DATA_CONST", "__objc_scoffs", objcCacheOffsetsSize); } }); if ( objcCacheOffsets == nullptr ) { fprintf(stderr, "Unable to print imp-caches as cannot find __DATA_CONST __objc_scoffs inside /usr/lib/libobjc.A.dylib\n"); return 1; } if ( objcCacheOffsetsSize < (4 * pointerSize) ) { fprintf(stderr, "Unable to print imp-caches as __DATA_CONST __objc_scoffs is too small (%lld vs required %u)\n", objcCacheOffsetsSize, (4 * pointerSize)); return 1; } dyld3::MachOAnalyzer::VMAddrConverter vmAddrConverter = dyldCache->makeVMAddrConverter(contentRebased); uint64_t selectorStringVMAddrStart = vmAddrConverter.convertToVMAddr(((uint64_t*)objcCacheOffsets)[0]); uint64_t selectorStringVMAddrEnd = vmAddrConverter.convertToVMAddr(((uint64_t*)objcCacheOffsets)[1]); dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { if (diag.hasError()) return; const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; intptr_t slide = ma->getSlide(); ma->forEachObjCClass(diag, vmAddrConverter, ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { const char* className = (const char*)objcClass.nameVMAddr(pointerSize) + slide; classVMAddrToNameMap[classVMAddr] = className; ma->forEachObjCMethod(objcClass.baseMethodsVMAddr(pointerSize), vmAddrConverter, ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { // const char* methodName = (const char*)(method.nameVMAddr + slide); methodToClassMap[method.impVMAddr] = className; }); }); ma->forEachObjCCategory(diag, vmAddrConverter, ^(Diagnostics& diag, uint64_t categoryVMAddr, const dyld3::MachOAnalyzer::ObjCCategory& objcCategory) { ma->forEachObjCMethod(objcCategory.instanceMethodsVMAddr, vmAddrConverter, ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { const char* catName = (const char*)objcCategory.nameVMAddr + slide; // const char* methodName = (const char*)(method.nameVMAddr + slide); methodToClassMap[method.impVMAddr] = catName; }); ma->forEachObjCMethod(objcCategory.classMethodsVMAddr, vmAddrConverter, ^(uint64_t methodVMAddr, const dyld3::MachOAnalyzer::ObjCMethod& method) { const char* catName = (const char*)objcCategory.nameVMAddr + slide; // const char* methodName = (const char*)(method.nameVMAddr + slide); methodToClassMap[method.impVMAddr] = catName; }); }); }); if (diag.hasError()) return 1; dyldCache->forEachImage(^(const mach_header *mh, const char *installName) { if (diag.hasError()) return; const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)mh; intptr_t slide = ma->getSlide(); ma->forEachObjCClass(diag, vmAddrConverter, ^(Diagnostics& diag, uint64_t classVMAddr, uint64_t classSuperclassVMAddr, uint64_t classDataVMAddr, const dyld3::MachOAnalyzer::ObjCClassInfo& objcClass, bool isMetaClass) { const char* type = "class"; if (isMetaClass) type = "meta-class"; const char* className = (const char*)objcClass.nameVMAddr(pointerSize) + slide; if (objcClass.methodCacheVMAddr == 0) { printf("%s (%s): empty\n", className, type); return; } struct Bucket { uint32_t selOffset; uint32_t impOffset; }; struct ImpCache { int32_t fallback_class_offset; uint32_t cache_shift : 5; uint32_t cache_mask : 11; uint32_t occupied : 14; uint32_t has_inlines : 1; uint32_t bit_one : 1; struct Bucket buckets[]; }; const ImpCache* impCache = (const ImpCache*)(objcClass.methodCacheVMAddr + slide); printf("%s (%s): %d buckets\n", className, type, impCache->cache_mask + 1); if ((classVMAddr + impCache->fallback_class_offset) != objcClass.superclassVMAddr) { printf("Flattening fallback: %s\n", classVMAddrToNameMap[classVMAddr + impCache->fallback_class_offset]); } // Buckets are a 32-bit offset from the impcache itself for (uint32_t i = 0; i <= impCache->cache_mask ; ++i) { const Bucket& b = impCache->buckets[i]; uint64_t sel = (uint64_t)b.selOffset + selectorStringVMAddrStart; uint64_t imp = classVMAddr - (uint64_t)b.impOffset; if (b.selOffset == 0xFFFFFFFF) { // Empty bucket printf(" - 0x%016llx: %s\n", 0ULL, ""); } else { assert(sel < selectorStringVMAddrEnd); auto it = methodToClassMap.find(imp); if (it == methodToClassMap.end()) { fprintf(stderr, "Could not find IMP %llx (for %s)\n", imp, (const char*)(sel + slide)); } assert(it != methodToClassMap.end()); printf(" - 0x%016llx: %s (from %s)\n", imp, (const char*)(sel + slide), it->second); } } }); }); } else { switch ( options.mode ) { case modeList: { // list all dylibs, including their aliases (symlinks to them) with option vmaddr __block std::vector<std::unordered_set<std::string>> indexToPaths; __block std::vector<uint64_t> indexToAddr; __block std::vector<std::string> indexToUUID; dyldCache->forEachImageTextSegment(^(uint64_t loadAddressUnslid, uint64_t textSegmentSize, const unsigned char* dylibUUID, const char* installName, bool& stop) { std::unordered_set<std::string> empty; if ( options.printVMAddrs ) indexToAddr.push_back(loadAddressUnslid); if ( options.printUUIDs ) { uuid_string_t uuidString; uuid_unparse_upper(dylibUUID, uuidString); indexToUUID.push_back(uuidString); } indexToPaths.push_back(empty); indexToPaths.back().insert(installName); }); dyldCache->forEachDylibPath(^(const char* dylibPath, uint32_t index) { indexToPaths[index].insert(dylibPath); }); int index = 0; for (const std::unordered_set<std::string>& paths : indexToPaths) { for (const std::string& path: paths) { if ( options.printVMAddrs ) printf("0x%08llX ", indexToAddr[index]); if ( options.printUUIDs ) printf("<%s> ", indexToUUID[index].c_str()); printf("%s\n", path.c_str()); } ++index; } break; } case modeListDylibsWithSection: { dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOFile* mf = (dyld3::MachOFile*)mh; mf->forEachSection(^(const dyld3::MachOFile::SectionInfo& sectInfo, bool malformedSectionRange, bool& stop) { if ( (strcmp(sectInfo.sectName, options.sectionName) == 0) && (strcmp(sectInfo.segInfo.segName, options.segmentName) == 0) ) { printf("%s\n", installName); stop = true; } }); }); break; } case modeMap: { __block std::map<uint64_t, const char*> dataSegNames; __block std::map<uint64_t, uint64_t> dataSegEnds; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOFile* mf = (dyld3::MachOFile*)mh; mf->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo &info, bool &stop) { printf("0x%08llX - 0x%08llX %s %s\n", info.vmAddr, info.vmAddr + info.vmSize, info.segName, installName); if ( strncmp(info.segName, "__DATA", 6) == 0 ) { dataSegNames[info.vmAddr] = installName; dataSegEnds[info.vmAddr] = info.vmAddr + info.vmSize; } }); }); // <rdar://problem/51084507> Enhance dyld_shared_cache_util to show where section alignment added padding uint64_t lastEnd = 0; for (const auto& entry : dataSegEnds) { uint64_t padding = entry.first - lastEnd; if ( (padding > 32) && (lastEnd != 0) ) { printf("0x%08llX - 0x%08llX PADDING %lluKB\n", lastEnd, entry.first, padding/1024); } lastEnd = entry.second; } break; } case modeDependencies: { __block bool dependentTargetFound = false; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { if ( strcmp(options.dependentsOfPath, installName) != 0 ) return; dependentTargetFound = true; auto printDep = [&options](const char *loadPath, uint32_t compatVersion, uint32_t curVersion) { if ( options.printDylibVersions ) { uint32_t compat_vers = compatVersion; uint32_t current_vers = curVersion; printf("\t%s", loadPath); if ( compat_vers != 0xFFFFFFFF ) { printf("(compatibility version %u.%u.%u, current version %u.%u.%u)\n", (compat_vers >> 16), (compat_vers >> 8) & 0xff, (compat_vers) & 0xff, (current_vers >> 16), (current_vers >> 8) & 0xff, (current_vers) & 0xff); } else { printf("\n"); } } else { printf("\t%s\n", loadPath); } }; dyld3::MachOFile* mf = (dyld3::MachOFile*)mh; // First print out our dylib and version. const char* dylibInstallName; uint32_t currentVersion; uint32_t compatVersion; if ( mf->getDylibInstallName(&dylibInstallName, &compatVersion, ¤tVersion) ) { printDep(dylibInstallName, compatVersion, currentVersion); } // Then the dependent dylibs. mf->forEachDependentDylib(^(const char *loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool &stop) { printDep(loadPath, compatVersion, curVersion); }); }); if (options.dependentsOfPath && !dependentTargetFound) { fprintf(stderr, "Error: could not find '%s' in the shared cache at\n %s\n", options.dependentsOfPath, sharedCachePath); exit(1); } break; } case modeLinkEdit: { std::map<uint32_t, const char*> pageToContent; auto add_linkedit = [&pageToContent](uint32_t pageStart, uint32_t pageEnd, const char* message) { for (uint32_t p = pageStart; p <= pageEnd; p += 4096) { std::map<uint32_t, const char*>::iterator pos = pageToContent.find(p); if ( pos == pageToContent.end() ) { pageToContent[p] = strdup(message); } else { const char* oldMessage = pos->second; char* newMesssage; asprintf(&newMesssage, "%s, %s", oldMessage, message); pageToContent[p] = newMesssage; ::free((void*)oldMessage); } } }; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; Diagnostics diag; dyld3::MachOAnalyzer::LinkEditInfo leInfo; ma->getLinkEditPointers(diag, leInfo); if (diag.hasError()) return; char message[1000]; const char* shortName = strrchr(installName, '/') + 1; // add export trie info if ( leInfo.dyldInfo->export_size != 0 ) { //printf("export_off=0x%X\n", leInfo.dyldInfo->export_off()); uint32_t exportPageOffsetStart = leInfo.dyldInfo->export_off & (-4096); uint32_t exportPageOffsetEnd = (leInfo.dyldInfo->export_off + leInfo.dyldInfo->export_size) & (-4096); sprintf(message, "exports from %s", shortName); add_linkedit(exportPageOffsetStart, exportPageOffsetEnd, message); } // add binding info if ( leInfo.dyldInfo->bind_size != 0 ) { uint32_t bindPageOffsetStart = leInfo.dyldInfo->bind_off & (-4096); uint32_t bindPageOffsetEnd = (leInfo.dyldInfo->bind_off + leInfo.dyldInfo->bind_size) & (-4096); sprintf(message, "bindings from %s", shortName); add_linkedit(bindPageOffsetStart, bindPageOffsetEnd, message); } // add lazy binding info if ( leInfo.dyldInfo->lazy_bind_size != 0 ) { uint32_t lazybindPageOffsetStart = leInfo.dyldInfo->lazy_bind_off & (-4096); uint32_t lazybindPageOffsetEnd = (leInfo.dyldInfo->lazy_bind_off + leInfo.dyldInfo->lazy_bind_size) & (-4096); sprintf(message, "lazy bindings from %s", shortName); add_linkedit(lazybindPageOffsetStart, lazybindPageOffsetEnd, message); } // add weak binding info if ( leInfo.dyldInfo->weak_bind_size != 0 ) { uint32_t weakbindPageOffsetStart = leInfo.dyldInfo->weak_bind_off & (-4096); uint32_t weakbindPageOffsetEnd = (leInfo.dyldInfo->weak_bind_off + leInfo.dyldInfo->weak_bind_size) & (-4096); sprintf(message, "weak bindings from %s", shortName); add_linkedit(weakbindPageOffsetStart, weakbindPageOffsetEnd, message); } }); for (std::map<uint32_t, const char*>::iterator it = pageToContent.begin(); it != pageToContent.end(); ++it) { printf("0x%08X %s\n", it->first, it->second); } break; } case modeSize: { struct TextInfo { uint64_t textSize; const char* path; }; __block std::vector<TextInfo> textSegments; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { dyld3::MachOAnalyzer* ma = (dyld3::MachOAnalyzer*)mh; ma->forEachSegment(^(const dyld3::MachOAnalyzer::SegmentInfo &info, bool &stop) { if ( strcmp(info.segName, "__TEXT") != 0 ) return; textSegments.push_back({ info.fileSize, installName }); }); }); std::sort(textSegments.begin(), textSegments.end(), [](const TextInfo& left, const TextInfo& right) { return (left.textSize > right.textSize); }); for (std::vector<TextInfo>::iterator it = textSegments.begin(); it != textSegments.end(); ++it) { printf(" 0x%08llX %s\n", it->textSize, it->path); } break; } case modePatchTable: { std::vector<SegmentInfo> segInfos; buildSegmentInfo(dyldCache, segInfos); __block uint32_t imageIndex = 0; dyldCache->forEachImage(^(const mach_header* mh, const char* installName) { printf("%s:\n", installName); dyldCache->forEachPatchableExport(imageIndex, ^(uint32_t cacheOffsetOfImpl, const char* exportName) { printf(" export: 0x%08X %s\n", cacheOffsetOfImpl, exportName); dyldCache->forEachPatchableUseOfExport(imageIndex, cacheOffsetOfImpl, ^(dyld_cache_patchable_location patchLocation) { SegmentInfo usageAt; const uint64_t patchLocVmAddr = dyldCache->unslidLoadAddress() + patchLocation.cacheOffset; findImageAndSegment(dyldCache, segInfos, patchLocation.cacheOffset, &usageAt); if ( patchLocation.addend == 0 ) printf(" used by: %s+0x%04llX in %s\n", usageAt.segName, patchLocVmAddr-usageAt.vmAddr, usageAt.installName); else printf(" used by: %s+0x%04llX (addend=%d) in %s\n", usageAt.segName, patchLocVmAddr-usageAt.vmAddr, patchLocation.addend, usageAt.installName); }); }); ++imageIndex; }); break; } case modeNone: case modeInfo: case modeSlideInfo: case modeVerboseSlideInfo: case modeTextInfo: case modeLocalSymbols: case modeJSONMap: case modeJSONDependents: case modeSectionSizes: case modeStrings: case modeObjCProtocols: case modeObjCImpCaches: case modeObjCClasses: case modeObjCSelectors: case modeExtract: break; } } return 0; } |