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Des références à un nouvel OS d'Apple appelé Reality OS émergent dans des référentiels GitHub utilisés par l'entreprise
Suggérant qu'Apple prépare un OS dédié à la réalité augmentée

Le , par Stéphane le calme

166PARTAGES

9  0 
Les développeurs logiciels ont découvert des références apparentes à un nouveau système d'exploitation Apple appelé realityOS dans les journaux de téléchargement de l'App Store et dans les référentiels GitHub utilisés par l'entreprise. Les références ont été largement partagées par les développeurs sur Twitter.

Il n'y a plus beaucoup de place pour le doute : des éléments indiquent qu'Apple prépare bien un système d'exploitation spécifiquement dédié à la réalité augmentée. En parcourant la portion de code open source utilisée par l'App Store et publiée sur GitHub, des développeurs ont trouvé des lignes de code qui évoquent un nouveau système baptisé « realityOS », qui sera sans doute lié au projet de casque AR/VR d'Apple. Des liens entre iOS et ce nouveau système sont mentionnés, mais aussi un simulateur utilisé par les développeurs pour tester leurs applications sans avoir le matériel sous la main.

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#include <stdlib.h> 
#include <assert.h> 
#include <string.h> 
#include <stdio.h> 
#include <sys/stat.h> 
#include <sys/types.h> 
#include <sys/errno.h> 
#include <sys/fcntl.h> 
#include <unistd.h> 
#include <TargetConditionals.h> 
#include <mach/host_info.h> 
#include <mach/mach.h> 
#include <mach/mach_host.h> 
  
#include "Array.h" 
#include "MachOFile.h" 
#include "SupportedArchs.h" 
  
#if BUILDING_DYLD || BUILDING_LIBDYLD 
    // define away restrict until rdar://60166935 is fixed 
    #define restrict 
    #include <subsystem.h> 
#endif 
  
namespace dyld3 { 
  
////////////////////////////  posix wrappers //////////////////////////////////////// 
  
// <rdar://problem/10111032> wrap calls to stat() with check for EAGAIN 
int stat(const char* path, struct stat* buf) 
{ 
    int result; 
    do { 
#if BUILDING_DYLD 
        result = ::stat_with_subsystem(path, buf); 
#else 
        result = ::stat(path, buf); 
#endif 
    } while ((result == -1) && ((errno == EAGAIN) || (errno == EINTR))); 
  
    return result; 
} 
  
// <rdar://problem/13805025> dyld should retry open() if it gets an EGAIN 
int open(const char* path, int flag, int other) 
{ 
    int result; 
    do { 
#if BUILDING_DYLD 
        if (flag & O_CREAT) 
            result = ::open(path, flag, other); 
        else 
            result = ::open_with_subsystem(path, flag); 
#else 
        result = ::open(path, flag, other); 
#endif 
    } while ((result == -1) && ((errno == EAGAIN) || (errno == EINTR))); 
  
    return result; 
} 
  
  
////////////////////////////  FatFile //////////////////////////////////////// 
  
const FatFile* FatFile::isFatFile(const void* fileStart) 
{ 
    const FatFile* fileStartAsFat = (FatFile*)fileStart; 
    if ( (fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC)) || (fileStartAsFat->magic == OSSwapBigToHostInt32(FAT_MAGIC_64)) ) 
        return fileStartAsFat; 
    else 
        return nullptr; 
} 
  
bool FatFile::isValidSlice(Diagnostics& diag, uint64_t fileLen, uint32_t sliceIndex, 
                           uint32_t sliceCpuType, uint32_t sliceCpuSubType, uint64_t sliceOffset, uint64_t sliceLen) const { 
    if ( greaterThanAddOrOverflow(sliceOffset, sliceLen, fileLen) ) { 
        diag.error("slice %d extends beyond end of file", sliceIndex); 
        return false; 
    } 
    const dyld3::MachOFile* mf = (const dyld3::MachOFile*)((uint8_t*)this+sliceOffset); 
    if (!mf->isMachO(diag, sliceLen)) 
        return false; 
    if ( mf->cputype != (cpu_type_t)sliceCpuType ) { 
        diag.error("cpu type in slice (0x%08X) does not match fat header (0x%08X)", mf->cputype, sliceCpuType); 
        return false; 
    } 
    else if ( (mf->cpusubtype & ~CPU_SUBTYPE_MASK) != (sliceCpuSubType & ~CPU_SUBTYPE_MASK) ) { 
        diag.error("cpu subtype in slice (0x%08X) does not match fat header (0x%08X)", mf->cpusubtype, sliceCpuSubType); 
        return false; 
    } 
    uint32_t pageSizeMask = mf->uses16KPages() ? 0x3FFF : 0xFFF; 
    if ( (sliceOffset & pageSizeMask) != 0 ) { 
        // slice not page aligned 
        if ( strncmp((char*)this+sliceOffset, "!<arch>", 7) == 0 ) 
            diag.error("file is static library"); 
        else 
            diag.error("slice is not page aligned"); 
        return false; 
    } 
    return true; 
} 
  
void FatFile::forEachSlice(Diagnostics& diag, uint64_t fileLen, bool validate, 
                           void (^callback)(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop)) const 
{ 
	if ( this->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) { 
        const uint64_t maxArchs = ((4096 - sizeof(fat_header)) / sizeof(fat_arch)); 
        const uint32_t numArchs = OSSwapBigToHostInt32(nfat_arch); 
        if ( numArchs > maxArchs ) { 
            diag.error("fat header too large: %u entries", numArchs); 
            return; 
        } 
        bool stop = false; 
        const fat_arch* const archs = (fat_arch*)(((char*)this)+sizeof(fat_header)); 
        for (uint32_t i=0; i < numArchs; ++i) { 
            uint32_t cpuType    = OSSwapBigToHostInt32(archs[i].cputype); 
            uint32_t cpuSubType = OSSwapBigToHostInt32(archs[i].cpusubtype); 
            uint32_t offset     = OSSwapBigToHostInt32(archs[i].offset); 
            uint32_t len        = OSSwapBigToHostInt32(archs[i].size); 
            Diagnostics sliceDiag; 
            if ( !validate || isValidSlice(sliceDiag, fileLen, i, cpuType, cpuSubType, offset, len) ) 
                callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop); 
            if ( stop ) 
                break; 
            if ( sliceDiag.hasError() ) 
                diag.appendError("%s, ", sliceDiag.errorMessageCStr()); 
        } 
  
        // Look for one more slice 
        if ( numArchs != maxArchs ) { 
            uint32_t cpuType    = OSSwapBigToHostInt32(archs[numArchs].cputype); 
            uint32_t cpuSubType = OSSwapBigToHostInt32(archs[numArchs].cpusubtype); 
            uint32_t offset     = OSSwapBigToHostInt32(archs[numArchs].offset); 
            uint32_t len        = OSSwapBigToHostInt32(archs[numArchs].size); 
            if ((cpuType == CPU_TYPE_ARM64) && ((cpuSubType == CPU_SUBTYPE_ARM64_ALL || cpuSubType == CPU_SUBTYPE_ARM64_V8))) { 
                if ( !validate || isValidSlice(diag, fileLen, numArchs, cpuType, cpuSubType, offset, len) ) 
                    callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop); 
            } 
        } 
    } 
    else if ( this->magic == OSSwapBigToHostInt32(FAT_MAGIC_64) ) { 
        if ( OSSwapBigToHostInt32(nfat_arch) > ((4096 - sizeof(fat_header)) / sizeof(fat_arch)) ) { 
            diag.error("fat header too large: %u entries", OSSwapBigToHostInt32(nfat_arch)); 
            return; 
        } 
        bool stop = false; 
        const fat_arch_64* const archs = (fat_arch_64*)(((char*)this)+sizeof(fat_header)); 
        for (uint32_t i=0; i < OSSwapBigToHostInt32(nfat_arch); ++i) { 
            uint32_t cpuType    = OSSwapBigToHostInt32(archs[i].cputype); 
            uint32_t cpuSubType = OSSwapBigToHostInt32(archs[i].cpusubtype); 
            uint64_t offset     = OSSwapBigToHostInt64(archs[i].offset); 
            uint64_t len        = OSSwapBigToHostInt64(archs[i].size); 
            if ( !validate || isValidSlice(diag, fileLen, i, cpuType, cpuSubType, offset, len) ) 
                callback(cpuType, cpuSubType, (uint8_t*)this+offset, len, stop); 
            if ( stop ) 
                break; 
        } 
    } 
    else { 
        diag.error("not a fat file"); 
    } 
} 
  
void FatFile::forEachSlice(Diagnostics& diag, uint64_t fileLen, void (^callback)(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop)) const 
{ 
    forEachSlice(diag, fileLen, true, callback); 
} 
  
const char* FatFile::archNames(char strBuf[256]) const 
{ 
    strBuf[0] = '\0'; 
    Diagnostics   diag; 
    __block bool  needComma = false; 
    this->forEachSlice(diag, 0xFFFFFFFF, false, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) { 
        if ( needComma ) 
            strlcat(strBuf, ",", 256); 
        strlcat(strBuf, MachOFile::archName(sliceCpuType, sliceCpuSubType), 256); 
        needComma = true; 
    }); 
    return strBuf; 
} 
  
bool FatFile::isFatFileWithSlice(Diagnostics& diag, uint64_t fileLen, const GradedArchs& archs, bool isOSBinary, 
                                 uint64_t& sliceOffset, uint64_t& sliceLen, bool& missingSlice) const 
{ 
    missingSlice = false; 
    if ( (this->magic != OSSwapBigToHostInt32(FAT_MAGIC)) && (this->magic != OSSwapBigToHostInt32(FAT_MAGIC_64)) ) 
        return false; 
  
    __block int bestGrade = 0; 
    forEachSlice(diag, fileLen, ^(uint32_t sliceCpuType, uint32_t sliceCpuSubType, const void* sliceStart, uint64_t sliceSize, bool& stop) { 
        if (int sliceGrade = archs.grade(sliceCpuType, sliceCpuSubType, isOSBinary)) { 
            if ( sliceGrade > bestGrade ) { 
                sliceOffset = (char*)sliceStart - (char*)this; 
                sliceLen    = sliceSize; 
                bestGrade   = sliceGrade; 
            } 
        } 
    }); 
    if ( diag.hasError() ) 
        return false; 
  
    if ( bestGrade == 0 ) 
        missingSlice = true; 
  
    return (bestGrade != 0); 
} 
  
  
////////////////////////////  GradedArchs //////////////////////////////////////// 
  
  
#define GRADE_i386        CPU_TYPE_I386,       CPU_SUBTYPE_I386_ALL,    false 
#define GRADE_x86_64      CPU_TYPE_X86_64,     CPU_SUBTYPE_X86_64_ALL,  false 
#define GRADE_x86_64h     CPU_TYPE_X86_64,     CPU_SUBTYPE_X86_64_H,    false 
#define GRADE_armv7       CPU_TYPE_ARM,        CPU_SUBTYPE_ARM_V7,      false 
#define GRADE_armv7s      CPU_TYPE_ARM,        CPU_SUBTYPE_ARM_V7S,     false 
#define GRADE_armv7k      CPU_TYPE_ARM,        CPU_SUBTYPE_ARM_V7K,     false 
#define GRADE_arm64       CPU_TYPE_ARM64,      CPU_SUBTYPE_ARM64_ALL,   false 
#define GRADE_arm64e      CPU_TYPE_ARM64,      CPU_SUBTYPE_ARM64E,      false 
#define GRADE_arm64e_pb   CPU_TYPE_ARM64,      CPU_SUBTYPE_ARM64E,      true 
#define GRADE_arm64_32    CPU_TYPE_ARM64_32,   CPU_SUBTYPE_ARM64_32_V8, false 
  
const GradedArchs GradedArchs::i386              = { {{GRADE_i386,    1}} }; 
const GradedArchs GradedArchs::x86_64            = { {{GRADE_x86_64,  1}} }; 
const GradedArchs GradedArchs::x86_64h           = { {{GRADE_x86_64h, 2}, {GRADE_x86_64, 1}} }; 
const GradedArchs GradedArchs::arm64             = { {{GRADE_arm64,   1}} }; 
#if SUPPORT_ARCH_arm64e 
const GradedArchs GradedArchs::arm64e_keysoff    = { {{GRADE_arm64e,    2}, {GRADE_arm64, 1}} }; 
const GradedArchs GradedArchs::arm64e_keysoff_pb = { {{GRADE_arm64e_pb, 2}, {GRADE_arm64, 1}} }; 
const GradedArchs GradedArchs::arm64e            = { {{GRADE_arm64e,    1}} }; 
const GradedArchs GradedArchs::arm64e_pb         = { {{GRADE_arm64e_pb, 1}} }; 
#endif 
const GradedArchs GradedArchs::armv7             = { {{GRADE_armv7,   1}} }; 
const GradedArchs GradedArchs::armv7s            = { {{GRADE_armv7s,  2}, {GRADE_armv7, 1}} }; 
const GradedArchs GradedArchs::armv7k            = { {{GRADE_armv7k,  1}} }; 
#if SUPPORT_ARCH_arm64_32 
const GradedArchs GradedArchs::arm64_32          = { {{GRADE_arm64_32, 1}} }; 
#endif 
  
int GradedArchs::grade(uint32_t cputype, uint32_t cpusubtype, bool isOSBinary) const 
{ 
    for (const CpuGrade* p = _orderedCpuTypes; p->type != 0; ++p) { 
        if ( (p->type == cputype) && (p->subtype == (cpusubtype & ~CPU_SUBTYPE_MASK)) ) { 
            if ( p->osBinary ) { 
                if ( isOSBinary ) 
                    return p->grade; 
            } 
            else { 
                return p->grade; 
            } 
        } 
    } 
    return 0; 
} 
  
const char* GradedArchs::name() const 
{ 
    return MachOFile::archName(_orderedCpuTypes[0].type, _orderedCpuTypes[0].subtype); 
} 
  
bool GradedArchs::checksOSBinary() const 
{ 
    for (const CpuGrade* p = _orderedCpuTypes; p->type != 0; ++p) { 
        if ( p->osBinary ) 
            return true; 
    } 
    return false; 
} 
  
#if __x86_64__ 
static bool isHaswell() 
{ 
    // FIXME: figure out a commpage way to check this 
    struct host_basic_info info; 
    mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT; 
    mach_port_t hostPort = mach_host_self(); 
    kern_return_t result = host_info(hostPort, HOST_BASIC_INFO, (host_info_t)&info, &count); 
    mach_port_deallocate(mach_task_self(), hostPort); 
    return (result == KERN_SUCCESS) && (info.cpu_subtype == CPU_SUBTYPE_X86_64_H); 
} 
#endif 
  
const GradedArchs& GradedArchs::forCurrentOS(bool keysOff, bool osBinariesOnly) 
{ 
#if __arm64e__ 
    if ( osBinariesOnly ) 
        return (keysOff ? arm64e_keysoff_pb : arm64e_pb); 
    else 
        return (keysOff ? arm64e_keysoff : arm64e); 
#elif __ARM64_ARCH_8_32__ 
    return arm64_32; 
#elif __arm64__ 
    return arm64; 
#elif __ARM_ARCH_7K__ 
    return armv7k; 
#elif __ARM_ARCH_7S__ 
    return armv7s; 
#elif __ARM_ARCH_7A__ 
    return armv7; 
#elif __x86_64__ 
 #if TARGET_OS_SIMULATOR 
    return x86_64; 
  #else 
    return isHaswell() ? x86_64h : x86_64; 
  #endif 
#elif __i386__ 
    return i386; 
#else 
    #error unknown platform 
#endif 
} 
  
const GradedArchs& GradedArchs::forName(const char* archName, bool keysOff) 
{ 
    if (strcmp(archName, "x86_64h") == 0 ) 
        return x86_64h; 
    else if (strcmp(archName, "x86_64") == 0 ) 
        return x86_64; 
#if SUPPORT_ARCH_arm64e 
    else if (strcmp(archName, "arm64e") == 0 ) 
        return keysOff ? arm64e_keysoff : arm64e; 
#endif 
    else if (strcmp(archName, "arm64") == 0 ) 
        return arm64; 
    else if (strcmp(archName, "armv7k") == 0 ) 
        return armv7k; 
    else if (strcmp(archName, "armv7s") == 0 ) 
        return armv7s; 
    else if (strcmp(archName, "armv7") == 0 ) 
        return armv7; 
#if SUPPORT_ARCH_arm64_32 
    else if (strcmp(archName, "arm64_32") == 0 ) 
        return arm64_32; 
#endif 
    else if (strcmp(archName, "i386") == 0 ) 
        return i386; 
    assert(0 && "unknown arch name"); 
} 
  
  
  
////////////////////////////  MachOFile //////////////////////////////////////// 
  
  
const MachOFile::ArchInfo MachOFile::_s_archInfos[] = { 
    { "x86_64",   CPU_TYPE_X86_64,   CPU_SUBTYPE_X86_64_ALL  }, 
    { "x86_64h",  CPU_TYPE_X86_64,   CPU_SUBTYPE_X86_64_H    }, 
    { "i386",     CPU_TYPE_I386,     CPU_SUBTYPE_I386_ALL    }, 
    { "arm64",    CPU_TYPE_ARM64,    CPU_SUBTYPE_ARM64_ALL   }, 
#if SUPPORT_ARCH_arm64e 
    { "arm64e",   CPU_TYPE_ARM64,    CPU_SUBTYPE_ARM64E     }, 
#endif 
#if SUPPORT_ARCH_arm64_32 
    { "arm64_32", CPU_TYPE_ARM64_32, CPU_SUBTYPE_ARM64_32_V8 }, 
#endif 
    { "armv7k",   CPU_TYPE_ARM,      CPU_SUBTYPE_ARM_V7K     }, 
    { "armv7s",   CPU_TYPE_ARM,      CPU_SUBTYPE_ARM_V7S     }, 
    { "armv7",    CPU_TYPE_ARM,      CPU_SUBTYPE_ARM_V7      } 
}; 
  
const MachOFile::PlatformInfo MachOFile::_s_platformInfos[] = { 
    { "macOS",       Platform::macOS,             LC_VERSION_MIN_MACOSX   }, 
    { "iOS",         Platform::iOS,               LC_VERSION_MIN_IPHONEOS }, 
    { "tvOS",        Platform::tvOS,              LC_VERSION_MIN_TVOS     }, 
    { "watchOS",     Platform::watchOS,           LC_VERSION_MIN_WATCHOS  }, 
    { "bridgeOS",    Platform::bridgeOS,          LC_BUILD_VERSION        }, 
    { "MacCatalyst", Platform::iOSMac,            LC_BUILD_VERSION        }, 
    { "iOS-sim",     Platform::iOS_simulator,     LC_BUILD_VERSION        }, 
    { "tvOS-sim",    Platform::tvOS_simulator,    LC_BUILD_VERSION        }, 
    { "watchOS-sim", Platform::watchOS_simulator, LC_BUILD_VERSION        }, 
    { "driverKit",   Platform::driverKit,         LC_BUILD_VERSION        }, 
}; 
  
  
  
bool MachOFile::is64() const 
{ 
    return (this->magic == MH_MAGIC_64); 
} 
  
size_t MachOFile::machHeaderSize() const 
{ 
    return is64() ? sizeof(mach_header_64) : sizeof(mach_header); 
} 
  
uint32_t MachOFile::maskedCpuSubtype() const 
{ 
    return (this->cpusubtype & ~CPU_SUBTYPE_MASK); 
} 
  
uint32_t MachOFile::pointerSize() const 
{ 
    if (this->magic == MH_MAGIC_64) 
        return 8; 
    else 
        return 4; 
} 
  
bool MachOFile::uses16KPages() const 
{ 
    switch (this->cputype) { 
        case CPU_TYPE_ARM64: 
        case CPU_TYPE_ARM64_32: 
            return true; 
        case CPU_TYPE_ARM: 
            // iOS is 16k aligned for armv7/armv7s and watchOS armv7k is 16k aligned 
            return this->cpusubtype == CPU_SUBTYPE_ARM_V7K; 
        default: 
            return false; 
    } 
} 
  
bool MachOFile::isArch(const char* aName) const 
{ 
    return (strcmp(aName, archName(this->cputype, this->cpusubtype)) == 0); 
} 
  
const char* MachOFile::archName(uint32_t cputype, uint32_t cpusubtype) 
{ 
    for (const ArchInfo& info : _s_archInfos) { 
        if ( (cputype == info.cputype) && ((cpusubtype & ~CPU_SUBTYPE_MASK) == info.cpusubtype) ) { 
            return info.name; 
        } 
    } 
    return "unknown"; 
} 
  
uint32_t MachOFile::cpuTypeFromArchName(const char* archName) 
{ 
    for (const ArchInfo& info : _s_archInfos) { 
        if ( strcmp(archName, info.name) == 0 ) { 
            return info.cputype; 
        } 
    } 
    return 0; 
} 
  
uint32_t MachOFile::cpuSubtypeFromArchName(const char* archName) 
{ 
    for (const ArchInfo& info : _s_archInfos) { 
        if ( strcmp(archName, info.name) == 0 ) { 
            return info.cpusubtype; 
        } 
    } 
    return 0; 
} 
  
const char* MachOFile::archName() const 
{ 
    return archName(this->cputype, this->cpusubtype); 
} 
  
static void appendDigit(char*& s, unsigned& num, unsigned place, bool& startedPrinting) 
{ 
    if ( num >= place ) { 
        unsigned dig = (num/place); 
        *s++ = '0' + dig; 
        num -= (dig*place); 
        startedPrinting = true; 
    } 
    else if ( startedPrinting ) { 
        *s++ = '0'; 
    } 
} 
  
static void appendNumber(char*& s, unsigned num) 
{ 
    assert(num < 99999); 
    bool startedPrinting = false; 
    appendDigit(s, num, 10000, startedPrinting); 
    appendDigit(s, num,  1000, startedPrinting); 
    appendDigit(s, num,   100, startedPrinting); 
    appendDigit(s, num,    10, startedPrinting); 
    appendDigit(s, num,     1, startedPrinting); 
    if ( !startedPrinting ) 
        *s++ = '0'; 
} 
  
void MachOFile::packedVersionToString(uint32_t packedVersion, char versionString[32]) 
{ 
    // sprintf(versionString, "%d.%d.%d", (packedVersion >> 16), ((packedVersion >> 8) & 0xFF), (packedVersion & 0xFF)); 
    char* s = versionString; 
    appendNumber(s, (packedVersion >> 16)); 
    *s++ = '.'; 
    appendNumber(s, (packedVersion >> 8) & 0xFF); 
    *s++ = '.'; 
    appendNumber(s, (packedVersion & 0xFF)); 
    *s++ = '\0'; 
} 
  
bool MachOFile::builtForPlatform(Platform reqPlatform, bool onlyOnePlatform) const 
{ 
    __block bool foundRequestedPlatform = false; 
    __block bool foundOtherPlatform     = false; 
    forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) { 
        if ( platform == reqPlatform ) 
            foundRequestedPlatform = true; 
        else 
            foundOtherPlatform = true; 
    }); 
    // if checking that this binary is built for exactly one platform, fail if more 
    if ( foundOtherPlatform && onlyOnePlatform ) 
        return false; 
    if ( foundRequestedPlatform ) 
        return true; 
  
    // binary has no explict load command to mark platform 
    // could be an old macOS binary, look at arch 
    if  ( !foundOtherPlatform && (reqPlatform == Platform::macOS) ) { 
        if ( this->cputype == CPU_TYPE_X86_64 ) 
            return true; 
        if ( this->cputype == CPU_TYPE_I386 ) 
            return true; 
    } 
  
#if BUILDING_DYLDINFO 
    // Allow offline tools to analyze binaries dyld doesn't load, ie, those with platforms 
    if ( !foundOtherPlatform && (reqPlatform == Platform::unknown) ) 
        return true; 
#endif 
  
    return false; 
} 
  
bool MachOFile::loadableIntoProcess(Platform processPlatform, const char* path) const 
{ 
    if ( this->builtForPlatform(processPlatform) ) 
        return true; 
  
    // Some host macOS dylibs can be loaded into simulator processes 
    if ( MachOFile::isSimulatorPlatform(processPlatform) && this->builtForPlatform(Platform::macOS)) { 
        static const char* const macOSHost[] = { 
            "/usr/lib/system/libsystem_kernel.dylib", 
            "/usr/lib/system/libsystem_platform.dylib", 
            "/usr/lib/system/libsystem_pthread.dylib", 
            "/usr/lib/system/libsystem_platform_debug.dylib", 
            "/usr/lib/system/libsystem_pthread_debug.dylib", 
            "/usr/lib/system/host/liblaunch_sim.dylib", 
        }; 
        for (const char* libPath : macOSHost) { 
            if (strcmp(libPath, path) == 0) 
                return true; 
        } 
    } 
  
    // If this is being called on main executable where we expect a macOS program, Catalyst programs are also runnable 
    if ( (this->filetype == MH_EXECUTE) && (processPlatform == Platform::macOS) && this->builtForPlatform(Platform::iOSMac, true) ) 
        return true; 
#if (TARGET_OS_OSX && TARGET_CPU_ARM64) 
    if ( (this->filetype == MH_EXECUTE) && (processPlatform == Platform::macOS) && this->builtForPlatform(Platform::iOS, true) ) 
        return true; 
#endif 
  
#if TARGET_FEATURE_REALITYOS 
    // allow iOS executables to use realityOS dylibs 
    if ( (processPlatform == Platform::iOS) && this->builtForPlatform(Platform::realityOS, true) ) 
        return true; 
  
    // allow iOS_Sim executables to use realityOS_Sim dylibs 
    if ( (processPlatform == Platform::iOS_simulator) && this->builtForPlatform(Platform::realityOS_simulator, true) ) 
        return true; 
#endif 
  
    bool iOSonMac = (processPlatform == Platform::iOSMac); 
#if (TARGET_OS_OSX && TARGET_CPU_ARM64) 
    // allow iOS binaries in iOSApp 
    if ( processPlatform == Platform::iOS ) { 
        // can load Catalyst binaries into iOS process 
        if ( this->builtForPlatform(Platform::iOSMac) ) 
            return true; 
        iOSonMac = true; 
    } 
#endif 
    // macOS dylibs can be loaded into iOSMac processes 
    if ( (iOSonMac) && this->builtForPlatform(Platform::macOS, true) ) 
        return true; 
  
  
    return false; 
} 
  
bool MachOFile::isZippered() const 
{ 
    __block bool macOS = false; 
    __block bool iOSMac = false; 
    forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) { 
        if ( platform == Platform::macOS ) 
            macOS = true; 
        else if ( platform == Platform::iOSMac ) 
            iOSMac = true; 
    }); 
    return macOS && iOSMac; 
} 
  
bool MachOFile::inDyldCache() const { 
    return (this->flags & MH_DYLIB_IN_CACHE); 
} 
  
Platform MachOFile::currentPlatform() 
{ 
#if TARGET_OS_SIMULATOR 
  #if TARGET_OS_WATCH 
    return Platform::watchOS_simulator; 
  #elif TARGET_OS_TV 
    return Platform::tvOS_simulator; 
  #elif TARGET_FEATURE_REALITYOS 
    return Platform::realityOS_simulator; 
  #else 
    return Platform::iOS_simulator; 
  #endif 
#elif TARGET_OS_BRIDGE 
    return Platform::bridgeOS; 
#elif TARGET_OS_WATCH 
    return Platform::watchOS; 
#elif TARGET_OS_TV 
    return Platform::tvOS; 
#elif TARGET_OS_IOS 
    return Platform::iOS; 
#elif TARGET_FEATURE_REALITYOS 
    return Platform::realityOS; 
#elif TARGET_OS_OSX 
    return Platform::macOS; 
#elif TARGET_OS_DRIVERKIT 
    return Platform::driverKit; 
#else 
    #error unknown platform 
#endif 
} 
  
Platform MachOFile::basePlatform(dyld3::Platform reqPlatform) { 
    switch(reqPlatform) { 
        case Platform::unknown:               return Platform::unknown; 
        case Platform::macOS:                 return Platform::macOS; 
        case Platform::iOS:                   return Platform::iOS; 
        case Platform::tvOS:                  return Platform::tvOS; 
        case Platform::watchOS:               return Platform::watchOS; 
        case Platform::bridgeOS:              return Platform::bridgeOS; 
        case Platform::iOSMac:                return Platform::iOS; 
        case Platform::iOS_simulator:         return Platform::iOS; 
        case Platform::tvOS_simulator:        return Platform::tvOS; 
        case Platform::watchOS_simulator:     return Platform::watchOS; 
        case Platform::driverKit:             return Platform::driverKit; 
        default:                              return Platform::unknown; 
    } 
} 
  
  
const char* MachOFile::currentArchName() 
{ 
#if __ARM_ARCH_7K__ 
    return "armv7k"; 
#elif __ARM_ARCH_7A__ 
    return "armv7"; 
#elif __ARM_ARCH_7S__ 
    return "armv7s"; 
#elif __arm64e__ 
    return "arm64e"; 
#elif __arm64__ 
#if __LP64__ 
    return "arm64"; 
#else 
    return "arm64_32"; 
#endif 
#elif __x86_64__ 
    return isHaswell() ? "x86_64h" : "x86_64"; 
#elif __i386__ 
    return "i386"; 
#else 
    #error unknown arch 
#endif 
} 
  
bool MachOFile::isSimulatorPlatform(Platform platform, Platform* basePlatform) 
{ 
    switch ( platform ) { 
        case Platform::iOS_simulator: 
            if ( basePlatform ) 
                *basePlatform = Platform::iOS; 
            return true; 
        case Platform::watchOS_simulator: 
            if ( basePlatform ) 
                *basePlatform = Platform::watchOS; 
            return true; 
        case Platform::tvOS_simulator: 
            if ( basePlatform ) 
                *basePlatform = Platform::tvOS; 
            return true; 
       default: 
            return false; 
    } 
} 
  
bool MachOFile::isDyldManaged() const { 
    switch ( this->filetype ) { 
        case MH_BUNDLE: 
        case MH_EXECUTE: 
        case MH_DYLIB: 
            return true; 
        default: 
            break; 
    } 
    return false; 
} 
  
bool MachOFile::isDylib() const 
{ 
    return (this->filetype == MH_DYLIB); 
} 
  
bool MachOFile::isBundle() const 
{ 
    return (this->filetype == MH_BUNDLE); 
} 
  
bool MachOFile::isMainExecutable() const 
{ 
    return (this->filetype == MH_EXECUTE); 
} 
  
bool MachOFile::isDynamicExecutable() const 
{ 
    if ( this->filetype != MH_EXECUTE ) 
        return false; 
  
    // static executables do not have dyld load command 
    return hasLoadCommand(LC_LOAD_DYLINKER); 
} 
  
bool MachOFile::isStaticExecutable() const 
{ 
    if ( this->filetype != MH_EXECUTE ) 
        return false; 
  
    // static executables do not have dyld load command 
    return !hasLoadCommand(LC_LOAD_DYLINKER); 
} 
  
bool MachOFile::isKextBundle() const 
{ 
    return (this->filetype == MH_KEXT_BUNDLE); 
} 
  
bool MachOFile::isFileSet() const 
{ 
    return (this->filetype == MH_FILESET); 
} 
  
bool MachOFile::isPIE() const 
{ 
    return (this->flags & MH_PIE); 
} 
  
bool MachOFile::isPreload() const 
{ 
    return (this->filetype == MH_PRELOAD); 
} 
  
const char* MachOFile::platformName(Platform reqPlatform) 
{ 
    for (const PlatformInfo& info : _s_platformInfos) { 
        if ( info.platform == reqPlatform ) 
            return info.name; 
    } 
    return "unknown"; 
} 
  
void MachOFile::forEachSupportedPlatform(void (^handler)(Platform platform, uint32_t minOS, uint32_t sdk)) const 
{ 
    Diagnostics diag; 
    __block bool foundPlatform = false; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        const build_version_command* buildCmd = (build_version_command *)cmd; 
        const version_min_command*   versCmd  = (version_min_command*)cmd; 
        uint32_t                     sdk; 
        switch ( cmd->cmd ) { 
            case LC_BUILD_VERSION: 
                handler((Platform)(buildCmd->platform), buildCmd->minos, buildCmd->sdk); 
                foundPlatform = true; 
                break; 
            case LC_VERSION_MIN_MACOSX: 
                sdk = versCmd->sdk; 
                // The original LC_VERSION_MIN_MACOSX did not have an sdk field, assume sdk is same as minOS for those old binaries 
                if ( sdk == 0 ) 
                    sdk = versCmd->version; 
                handler(Platform::macOS, versCmd->version, sdk); 
                foundPlatform = true; 
                break; 
            case LC_VERSION_MIN_IPHONEOS: 
                if ( (this->cputype == CPU_TYPE_X86_64) || (this->cputype == CPU_TYPE_I386) ) 
                    handler(Platform::iOS_simulator, versCmd->version, versCmd->sdk); // old sim binary 
                else 
                    handler(Platform::iOS, versCmd->version, versCmd->sdk); 
                foundPlatform = true; 
                break; 
            case LC_VERSION_MIN_TVOS: 
                if ( this->cputype == CPU_TYPE_X86_64 ) 
                    handler(Platform::tvOS_simulator, versCmd->version, versCmd->sdk); // old sim binary 
                else 
                    handler(Platform::tvOS, versCmd->version, versCmd->sdk); 
                foundPlatform = true; 
                break; 
            case LC_VERSION_MIN_WATCHOS: 
                if ( (this->cputype == CPU_TYPE_X86_64) || (this->cputype == CPU_TYPE_I386) ) 
                    handler(Platform::watchOS_simulator, versCmd->version, versCmd->sdk); // old sim binary 
                else 
                    handler(Platform::watchOS, versCmd->version, versCmd->sdk); 
                foundPlatform = true; 
                break; 
        } 
    }); 
    if ( !foundPlatform ) { 
        // old binary with no explicit platform 
#if (BUILDING_DYLD || BUILDING_CLOSURE_UTIL) && TARGET_OS_OSX 
        if ( this->cputype == CPU_TYPE_X86_64 ) 
            handler(Platform::macOS, 0x000A0500, 0x000A0500); // guess it is a macOS 10.5 binary 
        // <rdar://problem/75343399> 
        // The Go linker emits non-standard binaries without a platform and we have to live with it. 
        if ( this->cputype == CPU_TYPE_ARM64 ) 
            handler(Platform::macOS, 0x000B0000, 0x000B0000); // guess it is a macOS 11.0 binary 
#endif 
    } 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
} 
  
  
bool MachOFile::isMachO(Diagnostics& diag, uint64_t fileSize) const 
{ 
    if ( !hasMachOMagic() ) { 
        // old PPC slices are not currently valid "mach-o" but should not cause an error 
        if ( !hasMachOBigEndianMagic() ) 
            diag.error("file does not start with MH_MAGIC[_64]"); 
        return false; 
    } 
    if ( this->sizeofcmds + machHeaderSize() > fileSize ) { 
        diag.error("load commands exceed length of first segment"); 
        return false; 
    } 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { }); 
    return diag.noError(); 
} 
  
bool MachOFile::hasMachOMagic() const 
{ 
    return ( (this->magic == MH_MAGIC) || (this->magic == MH_MAGIC_64) ); 
} 
  
bool MachOFile::hasMachOBigEndianMagic() const 
{ 
    return ( (this->magic == MH_CIGAM) || (this->magic == MH_CIGAM_64) ); 
} 
  
  
void MachOFile::forEachLoadCommand(Diagnostics& diag, void (^callback)(const load_command* cmd, bool& stop)) const 
{ 
    bool stop = false; 
    const load_command* startCmds = nullptr; 
    if ( this->magic == MH_MAGIC_64 ) 
        startCmds = (load_command*)((char *)this + sizeof(mach_header_64)); 
    else if ( this->magic == MH_MAGIC ) 
        startCmds = (load_command*)((char *)this + sizeof(mach_header)); 
    else if ( hasMachOBigEndianMagic() ) 
        return;  // can't process big endian mach-o 
    else { 
        const uint32_t* h = (uint32_t*)this; 
        diag.error("file does not start with MH_MAGIC[_64]: 0x%08X 0x%08X", h[0], h [1]); 
        return;  // not a mach-o file 
    } 
    const load_command* const cmdsEnd = (load_command*)((char*)startCmds + this->sizeofcmds); 
    const load_command* cmd = startCmds; 
    for (uint32_t i = 0; i < this->ncmds; ++i) { 
        const load_command* nextCmd = (load_command*)((char *)cmd + cmd->cmdsize); 
        if ( cmd->cmdsize < 8 ) { 
            diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) too small", i, this->ncmds, cmd, this, cmd->cmdsize); 
            return; 
        } 
        // FIXME: add check the cmdsize is pointer aligned (might reveal bin compat issues) 
        if ( (nextCmd > cmdsEnd) || (nextCmd < startCmds) ) { 
            diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) is too large, load commands end at %p", i, this->ncmds, cmd, this, cmd->cmdsize, cmdsEnd); 
            return; 
        } 
        callback(cmd, stop); 
        if ( stop ) 
            return; 
        cmd = nextCmd; 
    } 
} 
  
void MachOFile::removeLoadCommand(Diagnostics& diag, void (^callback)(const load_command* cmd, bool& remove, bool& stop)) 
{ 
    bool stop = false; 
    const load_command* startCmds = nullptr; 
    if ( this->magic == MH_MAGIC_64 ) 
        startCmds = (load_command*)((char *)this + sizeof(mach_header_64)); 
    else if ( this->magic == MH_MAGIC ) 
        startCmds = (load_command*)((char *)this + sizeof(mach_header)); 
    else if ( hasMachOBigEndianMagic() ) 
        return;  // can't process big endian mach-o 
    else { 
        const uint32_t* h = (uint32_t*)this; 
        diag.error("file does not start with MH_MAGIC[_64]: 0x%08X 0x%08X", h[0], h [1]); 
        return;  // not a mach-o file 
    } 
    const load_command* const cmdsEnd = (load_command*)((char*)startCmds + this->sizeofcmds); 
    auto cmd = (load_command*)startCmds; 
    const uint32_t origNcmds = this->ncmds; 
    unsigned bytesRemaining = this->sizeofcmds; 
    for (uint32_t i = 0; i < origNcmds; ++i) { 
        bool remove = false; 
        auto nextCmd = (load_command*)((char *)cmd + cmd->cmdsize); 
        if ( cmd->cmdsize < 8 ) { 
            diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) too small", i, this->ncmds, cmd, this, cmd->cmdsize); 
            return; 
        } 
        if ( (nextCmd > cmdsEnd) || (nextCmd < startCmds) ) { 
            diag.error("malformed load command #%d of %d at %p with mh=%p, size (0x%X) is too large, load commands end at %p", i, this->ncmds, cmd, this, cmd->cmdsize, cmdsEnd); 
            return; 
        } 
        callback(cmd, remove, stop); 
        if ( remove ) { 
            this->sizeofcmds -= cmd->cmdsize; 
            ::memmove((void*)cmd, (void*)nextCmd, bytesRemaining); 
            this->ncmds--; 
        } else { 
            bytesRemaining -= cmd->cmdsize; 
            cmd = nextCmd; 
        } 
        if ( stop ) 
            break; 
    } 
    if ( cmd ) 
     ::bzero(cmd, bytesRemaining); 
} 
  
const char* MachOFile::installName() const 
{ 
    const char*  name; 
    uint32_t     compatVersion; 
    uint32_t     currentVersion; 
    if ( getDylibInstallName(&name, &compatVersion, &currentVersion) ) 
        return name; 
    return nullptr; 
} 
  
bool MachOFile::getDylibInstallName(const char** installName, uint32_t* compatVersion, uint32_t* currentVersion) const 
{ 
    Diagnostics diag; 
    __block bool found = false; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == LC_ID_DYLIB ) { 
            const dylib_command*  dylibCmd = (dylib_command*)cmd; 
            *compatVersion  = dylibCmd->dylib.compatibility_version; 
            *currentVersion = dylibCmd->dylib.current_version; 
            *installName    = (char*)dylibCmd + dylibCmd->dylib.name.offset; 
            found = true; 
            stop = true; 
        } 
    }); 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
    return found; 
} 
  
bool MachOFile::getUuid(uuid_t uuid) const 
{ 
    Diagnostics diag; 
    __block bool found = false; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == LC_UUID ) { 
            const uuid_command* uc = (const uuid_command*)cmd; 
            memcpy(uuid, uc->uuid, sizeof(uuid_t)); 
            found = true; 
            stop = true; 
        } 
    }); 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
    if ( !found ) 
        bzero(uuid, sizeof(uuid_t)); 
    return found; 
} 
  
void MachOFile::forEachDependentDylib(void (^callback)(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop)) const 
{ 
    Diagnostics       diag; 
    __block unsigned  count   = 0; 
    __block bool      stopped = false; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
         switch ( cmd->cmd ) { 
            case LC_LOAD_DYLIB: 
            case LC_LOAD_WEAK_DYLIB: 
            case LC_REEXPORT_DYLIB: 
            case LC_LOAD_UPWARD_DYLIB: { 
                const dylib_command* dylibCmd = (dylib_command*)cmd; 
                const char* loadPath = (char*)dylibCmd + dylibCmd->dylib.name.offset; 
                callback(loadPath, (cmd->cmd == LC_LOAD_WEAK_DYLIB), (cmd->cmd == LC_REEXPORT_DYLIB), (cmd->cmd == LC_LOAD_UPWARD_DYLIB), 
                                    dylibCmd->dylib.compatibility_version, dylibCmd->dylib.current_version, stop); 
                ++count; 
                if ( stop ) 
                    stopped = true; 
            } 
            break; 
        } 
    }); 
    // everything must link with something 
    if ( (count == 0) && !stopped ) { 
        // The dylibs that make up libSystem can link with nothing 
        // except for dylibs in libSystem.dylib which are ok to link with nothing (they are on bottom) 
        if ( this->builtForPlatform(Platform::driverKit, true) ) { 
            if ( !this->isDylib() || (strncmp(this->installName(), "/System/DriverKit/usr/lib/system/", 33) != 0) ) 
                callback("/System/DriverKit/usr/lib/libSystem.B.dylib", false, false, false, 0x00010000, 0x00010000, stopped); 
        } 
        else { 
            if ( !this->isDylib() || (strncmp(this->installName(), "/usr/lib/system/", 16) != 0) ) 
                callback("/usr/lib/libSystem.B.dylib", false, false, false, 0x00010000, 0x00010000, stopped); 
        } 
    } 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
} 
  
void MachOFile::forDyldEnv(void (^callback)(const char* envVar, bool& stop)) const 
{ 
    Diagnostics diag; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
         if ( cmd->cmd == LC_DYLD_ENVIRONMENT ) { 
            const dylinker_command* envCmd = (dylinker_command*)cmd; 
            const char* keyEqualsValue = (char*)envCmd + envCmd->name.offset; 
            // only process variables that start with DYLD_ and end in _PATH 
            if ( (strncmp(keyEqualsValue, "DYLD_", 5) == 0) ) { 
                const char* equals = strchr(keyEqualsValue, '='); 
                if ( equals != NULL ) { 
                    if ( strncmp(&equals[-5], "_PATH", 5) == 0 ) { 
                        callback(keyEqualsValue, stop); 
                    } 
                } 
            } 
        } 
    }); 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
} 
  
bool MachOFile::enforceCompatVersion() const 
{ 
    __block bool result = true; 
    forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) { 
        switch ( platform ) { 
            case Platform::macOS: 
                if ( minOS >= 0x000A0E00 )  // macOS 10.14 
                    result = false; 
                break; 
            case Platform::iOS: 
            case Platform::tvOS: 
            case Platform::iOS_simulator: 
            case Platform::tvOS_simulator: 
                if ( minOS >= 0x000C0000 )  // iOS 12.0 
                    result = false; 
                break; 
            case Platform::watchOS: 
            case Platform::watchOS_simulator: 
                if ( minOS >= 0x00050000 )  // watchOS 5.0 
                    result = false; 
                break; 
            case Platform::bridgeOS: 
                if ( minOS >= 0x00030000 )  // bridgeOS 3.0 
                    result = false; 
                break; 
            case Platform::driverKit: 
            case Platform::iOSMac: 
                result = false; 
                break; 
            case Platform::unknown: 
                break; 
        } 
    }); 
    return result; 
} 
  
const thread_command* MachOFile::unixThreadLoadCommand() const { 
    Diagnostics diag; 
    __block const thread_command* command = nullptr; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == LC_UNIXTHREAD ) { 
            command = (const thread_command*)cmd; 
            stop = true; 
        } 
    }); 
    return command; 
} 
  
  
uint32_t MachOFile::entryAddrRegisterIndexForThreadCmd() const 
{ 
    switch ( this->cputype ) { 
        case CPU_TYPE_I386: 
            return 10; // i386_thread_state_t.eip 
        case CPU_TYPE_X86_64: 
            return 16; // x86_thread_state64_t.rip 
        case CPU_TYPE_ARM: 
            return 15; // arm_thread_state_t.pc 
        case CPU_TYPE_ARM64: 
            return 32; // arm_thread_state64_t.__pc 
    } 
    return ~0U; 
} 
  
  
uint64_t MachOFile::entryAddrFromThreadCmd(const thread_command* cmd) const 
{ 
    assert(cmd->cmd == LC_UNIXTHREAD); 
    const uint32_t* regs32 = (uint32_t*)(((char*)cmd) + 16); 
    const uint64_t* regs64 = (uint64_t*)(((char*)cmd) + 16); 
  
    uint32_t index = entryAddrRegisterIndexForThreadCmd(); 
    if (index == ~0U) 
        return 0; 
  
    return is64() ? regs64[index] : regs32[index]; 
} 
  
  
void MachOFile::forEachSegment(void (^callback)(const SegmentInfo& info, bool& stop)) const 
{ 
    Diagnostics diag; 
    const bool  intel32  = (this->cputype == CPU_TYPE_I386); 
    __block uint32_t segIndex = 0; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == LC_SEGMENT_64 ) { 
            const segment_command_64* segCmd = (segment_command_64*)cmd; 
            uint64_t sizeOfSections = segCmd->vmsize; 
            uint8_t p2align = 0; 
            const section_64* const sectionsStart = (section_64*)((char*)segCmd + sizeof(struct segment_command_64)); 
            const section_64* const sectionsEnd   = &sectionsStart[segCmd->nsects]; 
            for (const section_64* sect=sectionsStart; sect < sectionsEnd; ++sect) { 
                sizeOfSections = sect->addr + sect->size - segCmd->vmaddr; 
                if ( sect->align > p2align ) 
                    p2align = sect->align; 
            } 
            SegmentInfo info; 
            info.fileOffset        = segCmd->fileoff; 
            info.fileSize          = segCmd->filesize; 
            info.vmAddr            = segCmd->vmaddr; 
            info.vmSize            = segCmd->vmsize; 
            info.sizeOfSections    = sizeOfSections; 
            info.segName           = segCmd->segname; 
            info.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this); 
            info.protections       = segCmd->initprot; 
            info.textRelocs        = false; 
            info.readOnlyData      = ((segCmd->flags & SG_READ_ONLY) != 0); 
            info.isProtected       = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0; 
            info.hasZeroFill       = (segCmd->initprot == 3) && (segCmd->filesize < segCmd->vmsize); 
            info.p2align           = p2align; 
            info.segIndex          = segIndex; 
            callback(info, stop); 
            ++segIndex; 
        } 
        else if ( cmd->cmd == LC_SEGMENT ) { 
            const segment_command* segCmd = (segment_command*)cmd; 
            uint64_t sizeOfSections = segCmd->vmsize; 
            uint8_t p2align = 0; 
            bool  hasTextRelocs = false; 
            const section* const sectionsStart = (section*)((char*)segCmd + sizeof(struct segment_command)); 
            const section* const sectionsEnd   = &sectionsStart[segCmd->nsects]; 
            for (const section* sect=sectionsStart; sect < sectionsEnd; ++sect) { 
                sizeOfSections = sect->addr + sect->size - segCmd->vmaddr; 
                if ( sect->align > p2align ) 
                    p2align = sect->align; 
                if ( sect->flags & (S_ATTR_EXT_RELOC|S_ATTR_LOC_RELOC) ) 
                    hasTextRelocs = true; 
           } 
            SegmentInfo info; 
            info.fileOffset        = segCmd->fileoff; 
            info.fileSize          = segCmd->filesize; 
            info.vmAddr            = segCmd->vmaddr; 
            info.vmSize            = segCmd->vmsize; 
            info.sizeOfSections    = sizeOfSections; 
            info.segName           = segCmd->segname; 
            info.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this); 
            info.protections       = segCmd->initprot; 
            info.textRelocs        = intel32 && !info.writable() && hasTextRelocs; 
            info.readOnlyData      = ((segCmd->flags & SG_READ_ONLY) != 0); 
            info.isProtected       = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0; 
            info.hasZeroFill       = (segCmd->initprot == 3) && (segCmd->filesize < segCmd->vmsize); 
            info.p2align           = p2align; 
            info.segIndex          = segIndex; 
            callback(info, stop); 
            ++segIndex; 
        } 
    }); 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
} 
  
uint64_t MachOFile::preferredLoadAddress() const 
{ 
    __block uint64_t textVmAddr = 0; 
    forEachSegment(^(const SegmentInfo& info, bool& stop) { 
        if ( strcmp(info.segName, "__TEXT") == 0 ) { 
            textVmAddr = info.vmAddr; 
            stop = true; 
        } 
    }); 
    return textVmAddr; 
} 
  
void MachOFile::forEachSection(void (^callback)(const SectionInfo& sectInfo, bool malformedSectionRange, bool& stop)) const 
{ 
    Diagnostics diag; 
    BLOCK_ACCCESSIBLE_ARRAY(char, sectNameCopy, 20);  // read as:  char sectNameCopy[20]; 
    const bool intel32 = (this->cputype == CPU_TYPE_I386); 
    __block uint32_t segIndex = 0; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        SectionInfo sectInfo; 
        if ( cmd->cmd == LC_SEGMENT_64 ) { 
            const segment_command_64* segCmd = (segment_command_64*)cmd; 
            uint64_t sizeOfSections = segCmd->vmsize; 
            uint8_t p2align = 0; 
            const section_64* const sectionsStart = (section_64*)((char*)segCmd + sizeof(struct segment_command_64)); 
            const section_64* const sectionsEnd   = &sectionsStart[segCmd->nsects]; 
            for (const section_64* sect=sectionsStart; sect < sectionsEnd; ++sect) { 
                sizeOfSections = sect->addr + sect->size - segCmd->vmaddr; 
                if ( sect->align > p2align ) 
                    p2align = sect->align; 
            } 
            sectInfo.segInfo.fileOffset        = segCmd->fileoff; 
            sectInfo.segInfo.fileSize          = segCmd->filesize; 
            sectInfo.segInfo.vmAddr            = segCmd->vmaddr; 
            sectInfo.segInfo.vmSize            = segCmd->vmsize; 
            sectInfo.segInfo.sizeOfSections    = sizeOfSections; 
            sectInfo.segInfo.segName           = segCmd->segname; 
            sectInfo.segInfo.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this); 
            sectInfo.segInfo.protections       = segCmd->initprot; 
            sectInfo.segInfo.textRelocs        = false; 
            sectInfo.segInfo.readOnlyData      = ((segCmd->flags & SG_READ_ONLY) != 0); 
            sectInfo.segInfo.isProtected       = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0; 
            sectInfo.segInfo.p2align           = p2align; 
            sectInfo.segInfo.segIndex          = segIndex; 
            for (const section_64* sect=sectionsStart; !stop && (sect < sectionsEnd); ++sect) { 
                const char* sectName = sect->sectname; 
                if ( sectName[15] != '\0' ) { 
                    strlcpy(sectNameCopy, sectName, 17); 
                    sectName = sectNameCopy; 
                } 
                bool malformedSectionRange = (sect->addr < segCmd->vmaddr) || greaterThanAddOrOverflow(sect->addr, sect->size, segCmd->vmaddr + segCmd->filesize); 
                sectInfo.sectName       = sectName; 
                sectInfo.sectFileOffset = sect->offset; 
                sectInfo.sectFlags      = sect->flags; 
                sectInfo.sectAddr       = sect->addr; 
                sectInfo.sectSize       = sect->size; 
                sectInfo.sectAlignP2    = sect->align; 
                sectInfo.reserved1      = sect->reserved1; 
                sectInfo.reserved2      = sect->reserved2; 
                callback(sectInfo, malformedSectionRange, stop); 
            } 
            ++segIndex; 
        } 
        else if ( cmd->cmd == LC_SEGMENT ) { 
            const segment_command* segCmd = (segment_command*)cmd; 
            uint64_t sizeOfSections = segCmd->vmsize; 
            uint8_t p2align = 0; 
            bool  hasTextRelocs = false; 
            const section* const sectionsStart = (section*)((char*)segCmd + sizeof(struct segment_command)); 
            const section* const sectionsEnd   = &sectionsStart[segCmd->nsects]; 
            for (const section* sect=sectionsStart; sect < sectionsEnd; ++sect) { 
                sizeOfSections = sect->addr + sect->size - segCmd->vmaddr; 
                if ( sect->align > p2align ) 
                    p2align = sect->align; 
                if ( sect->flags & (S_ATTR_EXT_RELOC|S_ATTR_LOC_RELOC) ) 
                    hasTextRelocs = true; 
            } 
            sectInfo.segInfo.fileOffset        = segCmd->fileoff; 
            sectInfo.segInfo.fileSize          = segCmd->filesize; 
            sectInfo.segInfo.vmAddr            = segCmd->vmaddr; 
            sectInfo.segInfo.vmSize            = segCmd->vmsize; 
            sectInfo.segInfo.sizeOfSections    = sizeOfSections; 
            sectInfo.segInfo.segName           = segCmd->segname; 
            sectInfo.segInfo.loadCommandOffset = (uint32_t)((uint8_t*)segCmd - (uint8_t*)this); 
            sectInfo.segInfo.protections       = segCmd->initprot; 
            sectInfo.segInfo.textRelocs        = intel32 && !sectInfo.segInfo.writable() && hasTextRelocs; 
            sectInfo.segInfo.readOnlyData      = ((segCmd->flags & SG_READ_ONLY) != 0); 
            sectInfo.segInfo.isProtected       = (segCmd->flags & SG_PROTECTED_VERSION_1) ? 1 : 0; 
            sectInfo.segInfo.p2align           = p2align; 
            sectInfo.segInfo.segIndex          = segIndex; 
            for (const section* sect=sectionsStart; !stop && (sect < sectionsEnd); ++sect) { 
                const char* sectName = sect->sectname; 
                if ( sectName[15] != '\0' ) { 
                    strlcpy(sectNameCopy, sectName, 17); 
                    sectName = sectNameCopy; 
                } 
                bool malformedSectionRange = (sect->addr < segCmd->vmaddr) || greaterThanAddOrOverflow(sect->addr, sect->size, segCmd->vmaddr + segCmd->filesize); 
                sectInfo.sectName       = sectName; 
                sectInfo.sectFileOffset = sect->offset; 
                sectInfo.sectFlags      = sect->flags; 
                sectInfo.sectAddr       = sect->addr; 
                sectInfo.sectSize       = sect->size; 
                sectInfo.sectAlignP2    = sect->align; 
                sectInfo.reserved1      = sect->reserved1; 
                sectInfo.reserved2      = sect->reserved2; 
                callback(sectInfo, malformedSectionRange, stop); 
            } 
            ++segIndex; 
        } 
    }); 
    diag.assertNoError();   // any malformations in the file should have been caught by earlier validate() call 
} 
  
void MachOFile::forEachInterposingSection(Diagnostics& diag, void (^handler)(uint64_t vmOffset, uint64_t vmSize, bool& stop)) const 
{ 
    const unsigned ptrSize   = pointerSize(); 
    const unsigned entrySize = 2 * ptrSize; 
    forEachSection(^(const MachOFile::SectionInfo& info, bool malformedSectionRange, bool &stop) { 
        if ( ((info.sectFlags & SECTION_TYPE) == S_INTERPOSING) || ((strcmp(info.sectName, "__interpose") == 0) && ((strncmp(info.segInfo.segName, "__DATA", 6) == 0) || strncmp(info.segInfo.segName, "__AUTH", 6) == 0)) ) { 
            if ( info.sectSize % entrySize != 0 ) { 
                diag.error("interposing section %s/%s has bad size", info.segInfo.segName, info.sectName); 
                stop = true; 
                return; 
            } 
            if ( malformedSectionRange ) { 
                diag.error("interposing section %s/%s extends beyond the end of the segment", info.segInfo.segName, info.sectName); 
                stop = true; 
                return; 
            } 
            if ( (info.sectAddr % ptrSize) != 0 ) { 
                diag.error("interposing section %s/%s is not pointer aligned", info.segInfo.segName, info.sectName); 
                stop = true; 
                return; 
            } 
            handler(info.sectAddr - preferredLoadAddress(), info.sectSize, stop); 
        } 
    }); 
} 
  
bool MachOFile::isRestricted() const 
{ 
    __block bool result = false; 
    forEachSection(^(const MachOFile::SectionInfo& info, bool malformedSectionRange, bool &stop) { 
        if ( (strcmp(info.segInfo.segName, "__RESTRICT") == 0) && (strcmp(info.sectName, "__restrict") == 0) ) { 
            result = true; 
            stop = true; 
        } 
    }); 
    return result; 
} 
  
bool MachOFile::hasWeakDefs() const 
{ 
    return (this->flags & MH_WEAK_DEFINES); 
} 
  
bool MachOFile::usesWeakDefs() const 
{ 
    return (this->flags & MH_BINDS_TO_WEAK); 
} 
  
bool MachOFile::hasThreadLocalVariables() const 
{ 
    return (this->flags & MH_HAS_TLV_DESCRIPTORS); 
} 
  
static bool endsWith(const char* str, const char* suffix) 
{ 
    size_t strLen    = strlen(str); 
    size_t suffixLen = strlen(suffix); 
    if ( strLen < suffixLen ) 
        return false; 
    return (strcmp(&str[strLen-suffixLen], suffix) == 0); 
} 
  
bool MachOFile::isSharedCacheEligiblePath(const char* dylibName) { 
    return (   (strncmp(dylibName, "/usr/lib/", 9) == 0) 
            || (strncmp(dylibName, "/System/Library/", 16) == 0) 
            || (strncmp(dylibName, "/System/iOSSupport/usr/lib/", 27) == 0) 
            || (strncmp(dylibName, "/System/iOSSupport/System/Library/", 34) == 0) 
            || (strncmp(dylibName, "/Library/Apple/usr/lib/", 23) == 0) 
            || (strncmp(dylibName, "/Library/Apple/System/Library/", 30) == 0) 
            || (strncmp(dylibName, "/System/DriverKit/", 18) == 0)); 
} 
  
static bool startsWith(const char* buffer, const char* valueToFind) { 
    return strncmp(buffer, valueToFind, strlen(valueToFind)) == 0; 
} 
  
static bool platformExcludesSharedCache_macOS(const char* installName) { 
    // Note: This function basically matches dontCache() from update dyld shared cache 
  
    if ( startsWith(installName, "/usr/lib/system/introspection/") ) 
        return true; 
    if ( startsWith(installName, "/System/Library/QuickTime/") ) 
        return true; 
    if ( startsWith(installName, "/System/Library/Tcl/") ) 
        return true; 
    if ( startsWith(installName, "/System/Library/Perl/") ) 
        return true; 
    if ( startsWith(installName, "/System/Library/MonitorPanels/") ) 
        return true; 
    if ( startsWith(installName, "/System/Library/Accessibility/") ) 
        return true; 
    if ( startsWith(installName, "/usr/local/") ) 
        return true; 
    if ( startsWith(installName, "/usr/lib/pam/") ) 
        return true; 
    // We no longer support ROSP, so skip all paths which start with the special prefix 
    if ( startsWith(installName, "/System/Library/Templates/Data/") ) 
        return true; 
  
    // anything inside a .app bundle is specific to app, so should not be in shared cache 
    if ( strstr(installName, ".app/") != NULL ) 
        return true; 
  
    return false; 
} 
  
static bool platformExcludesSharedCache_iOS(const char* installName) { 
    if ( strcmp(installName, "/System/Library/Caches/com.apple.xpc/sdk.dylib") == 0 ) 
        return true; 
    if ( strcmp(installName, "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib") == 0 ) 
        return true; 
    return false; 
} 
  
// Returns true if the current platform requires that this install name be excluded from the shared cache 
// Note that this overrides any exclusion from anywhere else. 
static bool platformExcludesSharedCache(Platform platform, const char* installName) { 
    if ( MachOFile::isSimulatorPlatform(platform) ) 
        return false; 
    if ( (platform == dyld3::Platform::macOS) || (platform == dyld3::Platform::iOSMac) ) 
        return platformExcludesSharedCache_macOS(installName); 
    // Everything else is based on iOS so just use that value 
    return platformExcludesSharedCache_iOS(installName); 
} 
  
  
bool MachOFile::canBePlacedInDyldCache(const char* path, void (^failureReason)(const char*)) const 
{ 
  
    if ( !isSharedCacheEligiblePath(path) ) { 
        // Dont spam the user with an error about paths when we know these are never eligible. 
        return false; 
    } 
  
    // only dylibs can go in cache 
    if ( this->filetype != MH_DYLIB ) { 
        failureReason("Not MH_DYLIB"); 
        return false; // cannot continue, installName() will assert() if not a dylib 
    } 
  
  
    const char* dylibName = installName(); 
    if ( dylibName[0] != '/' ) { 
        failureReason("install name not an absolute path"); 
        // Don't continue as we don't want to spam the log with errors we don't need. 
        return false; 
    } 
    else if ( strcmp(dylibName, path) != 0 ) { 
        failureReason("install path does not match install name"); 
        return false; 
    } 
    else if ( strstr(dylibName, "//") != 0 ) { 
        failureReason("install name should not include //"); 
        return false; 
    } 
    else if ( strstr(dylibName, "./") != 0 ) { 
        failureReason("install name should not include ./"); 
        return false; 
    } 
  
    __block bool platformExcludedFile = false; 
    forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) { 
        if ( platformExcludedFile ) 
            return; 
        if ( platformExcludesSharedCache(platform, dylibName) ) { 
            platformExcludedFile = true; 
            return; 
        } 
    }); 
    if ( platformExcludedFile ) { 
        failureReason("install name is not shared cache eligible on platform"); 
        return false; 
    } 
  
    bool retval = true; 
  
    // flat namespace files cannot go in cache 
    if ( (this->flags & MH_TWOLEVEL) == 0 ) { 
        retval = false; 
        failureReason("Not built with two level namespaces"); 
    } 
  
    // don't put debug variants into dyld cache 
    if ( endsWith(path, "_profile.dylib") || endsWith(path, "_debug.dylib") || endsWith(path, "_profile") || endsWith(path, "_debug") || endsWith(path, "/CoreADI") ) { 
        retval = false; 
        failureReason("Variant image"); 
    } 
  
    // dylib must have extra info for moving DATA and TEXT segments apart 
    __block bool hasExtraInfo = false; 
    __block bool hasDyldInfo = false; 
    __block bool hasExportTrie = false; 
    Diagnostics diag; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == LC_SEGMENT_SPLIT_INFO ) 
            hasExtraInfo = true; 
        if ( cmd->cmd == LC_DYLD_INFO_ONLY ) 
            hasDyldInfo = true; 
        if ( cmd->cmd == LC_DYLD_EXPORTS_TRIE ) 
            hasExportTrie = true; 
    }); 
    if ( !hasExtraInfo ) { 
        retval = false; 
        failureReason("Missing split seg info"); 
    } 
    if ( !hasDyldInfo && !hasExportTrie ) { 
        retval = false; 
        failureReason("Old binary, missing dyld info or export trie"); 
    } 
  
    // dylib can only depend on other dylibs in the shared cache 
    __block bool allDepPathsAreGood = true; 
    forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) { 
        // Skip weak links.  They are allowed to be missing 
        if ( isWeak ) 
            return; 
        if ( !isSharedCacheEligiblePath(loadPath) ) { 
            allDepPathsAreGood = false; 
            stop = true; 
        } 
    }); 
    if ( !allDepPathsAreGood ) { 
        retval = false; 
        failureReason("Depends on dylibs ineligable for dyld cache"); 
    } 
  
    // dylibs with interposing info cannot be in cache 
    if ( hasInterposingTuples() ) { 
        retval = false; 
        failureReason("Has interposing tuples"); 
    } 
  
    // Temporarily kick out swift binaries out of dyld cache on watchOS simulators as they have missing split seg 
    if ( (this->cputype == CPU_TYPE_I386) && builtForPlatform(Platform::watchOS_simulator) ) { 
        if ( strncmp(dylibName, "/usr/lib/swift/", 15) == 0 ) { 
            retval = false; 
            failureReason("i386 swift binary"); 
        } 
    } 
  
    return retval; 
} 
  
#if BUILDING_APP_CACHE_UTIL 
bool MachOFile::canBePlacedInKernelCollection(const char* path, void (^failureReason)(const char*)) const 
{ 
    // only dylibs and the kernel itself can go in cache 
    if ( this->filetype == MH_EXECUTE ) { 
        // xnu 
    } else if ( this->isKextBundle() ) { 
        // kext's 
    } else { 
        failureReason("Not MH_KEXT_BUNDLE"); 
        return false; 
    } 
  
    if ( this->filetype == MH_EXECUTE ) { 
        // xnu 
  
        // two-level namespace binaries cannot go in cache 
        if ( (this->flags & MH_TWOLEVEL) != 0 ) { 
            failureReason("Built with two level namespaces"); 
            return false; 
        } 
  
        // xnu kernel cannot have a page zero 
        __block bool foundPageZero = false; 
        forEachSegment(^(const SegmentInfo &segmentInfo, bool &stop) { 
            if ( strcmp(segmentInfo.segName, "__PAGEZERO") == 0 ) { 
                foundPageZero = true; 
                stop = true; 
            } 
        }); 
        if (foundPageZero) { 
            failureReason("Has __PAGEZERO"); 
            return false; 
        } 
  
        // xnu must have an LC_UNIXTHREAD to point to the entry point 
        __block bool foundMainLC = false; 
        __block bool foundUnixThreadLC = false; 
        Diagnostics diag; 
        forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
            if ( cmd->cmd == LC_MAIN ) { 
                foundMainLC = true; 
                stop = true; 
            } 
            else if ( cmd->cmd == LC_UNIXTHREAD ) { 
                foundUnixThreadLC = true; 
            } 
        }); 
        if (foundMainLC) { 
            failureReason("Found LC_MAIN"); 
            return false; 
        } 
        if (!foundUnixThreadLC) { 
            failureReason("Expected LC_UNIXTHREAD"); 
            return false; 
        } 
  
        if (diag.hasError()) { 
            failureReason("Error parsing load commands"); 
            return false; 
        } 
  
        // The kernel should be a static executable, not a dynamic one 
        if ( !isStaticExecutable() ) { 
            failureReason("Expected static executable"); 
            return false; 
        } 
  
        // The kernel must be built with -pie 
        if ( !isPIE() ) { 
            failureReason("Expected pie"); 
            return false; 
        } 
    } 
  
    if ( isArch("arm64e") && isKextBundle() && !hasChainedFixups() ) { 
        failureReason("Missing fixup information"); 
        return false; 
    } 
  
    // dylibs with interposing info cannot be in cache 
    if ( hasInterposingTuples() ) { 
        failureReason("Has interposing tuples"); 
        return false; 
    } 
  
    // Only x86_64 is allowed to have RWX segments 
    if ( !isArch("x86_64") && !isArch("x86_64h") ) { 
        __block bool foundBadSegment = false; 
        forEachSegment(^(const SegmentInfo &info, bool &stop) { 
            if ( (info.protections & (VM_PROT_WRITE | VM_PROT_EXECUTE)) == (VM_PROT_WRITE | VM_PROT_EXECUTE) ) { 
                failureReason("Segments are not allowed to be both writable and executable"); 
                foundBadSegment = true; 
                stop = true; 
            } 
        }); 
        if ( foundBadSegment ) 
            return false; 
    } 
  
    return true; 
} 
#endif 
  
static bool platformExcludesPrebuiltClosure_macOS(const char* path) { 
    // We no longer support ROSP, so skip all paths which start with the special prefix 
    if ( startsWith(path, "/System/Library/Templates/Data/") ) 
        return true; 
  
    // anything inside a .app bundle is specific to app, so should not get a prebuilt closure 
    if ( strstr(path, ".app/") != NULL ) 
        return true; 
  
    return false; 
} 
  
static bool platformExcludesPrebuiltClosure_iOS(const char* path) { 
    if ( strcmp(path, "/System/Library/Caches/com.apple.xpc/sdk.dylib") == 0 ) 
        return true; 
    if ( strcmp(path, "/System/Library/Caches/com.apple.xpcd/xpcd_cache.dylib") == 0 ) 
        return true; 
    return false; 
} 
  
// Returns true if the current platform requires that this install name be excluded from the shared cache 
// Note that this overrides any exclusion from anywhere else. 
static bool platformExcludesPrebuiltClosure(Platform platform, const char* path) { 
    if ( MachOFile::isSimulatorPlatform(platform) ) 
        return false; 
    if ( (platform == dyld3::Platform::macOS) || (platform == dyld3::Platform::iOSMac) ) 
        return platformExcludesPrebuiltClosure_macOS(path); 
    // Everything else is based on iOS so just use that value 
    return platformExcludesPrebuiltClosure_iOS(path); 
} 
  
bool MachOFile::canHavePrecomputedDlopenClosure(const char* path, void (^failureReason)(const char*)) const 
{ 
    __block bool retval = true; 
  
    // only dylibs can go in cache 
    if ( (this->filetype != MH_DYLIB) && (this->filetype != MH_BUNDLE) ) { 
        retval = false; 
        failureReason("not MH_DYLIB or MH_BUNDLE"); 
    } 
  
    // flat namespace files cannot go in cache 
    if ( (this->flags & MH_TWOLEVEL) == 0 ) { 
        retval = false; 
        failureReason("not built with two level namespaces"); 
    } 
  
    // can only depend on other dylibs with absolute paths 
    __block bool allDepPathsAreGood = true; 
    forEachDependentDylib(^(const char* loadPath, bool isWeak, bool isReExport, bool isUpward, uint32_t compatVersion, uint32_t curVersion, bool& stop) { 
        if ( loadPath[0] != '/' ) { 
            allDepPathsAreGood = false; 
            stop = true; 
        } 
    }); 
    if ( !allDepPathsAreGood ) { 
        retval = false; 
        failureReason("depends on dylibs that are not absolute paths"); 
    } 
  
    __block bool platformExcludedFile = false; 
    forEachSupportedPlatform(^(Platform platform, uint32_t minOS, uint32_t sdk) { 
        if ( platformExcludedFile ) 
            return; 
        if ( platformExcludesPrebuiltClosure(platform, path) ) { 
            platformExcludedFile = true; 
            return; 
        } 
    }); 
    if ( platformExcludedFile ) { 
        failureReason("file cannot get a prebuilt closure on this platform"); 
        return false; 
    } 
  
    // dylibs with interposing info cannot have dlopen closure pre-computed 
    if ( hasInterposingTuples() ) { 
        retval = false; 
        failureReason("has interposing tuples"); 
    } 
  
    // special system dylib overrides cannot have closure pre-computed 
    if ( strncmp(path, "/usr/lib/system/introspection/", 30) == 0 ) { 
        retval = false; 
        failureReason("override of OS dylib"); 
    } 
  
    return retval; 
} 
  
bool MachOFile::hasInterposingTuples() const 
{ 
    __block bool hasInterposing = false; 
    Diagnostics diag; 
    forEachInterposingSection(diag, ^(uint64_t vmOffset, uint64_t vmSize, bool &stop) { 
        hasInterposing = true; 
        stop = true; 
    }); 
    return hasInterposing; 
} 
  
bool MachOFile::isFairPlayEncrypted(uint32_t& textOffset, uint32_t& size) const 
{ 
    if ( const encryption_info_command* encCmd = findFairPlayEncryptionLoadCommand() ) { 
       if ( encCmd->cryptid == 1 ) { 
            // Note: cryptid is 0 in just-built apps.  The AppStore sets cryptid to 1 
            textOffset = encCmd->cryptoff; 
            size       = encCmd->cryptsize; 
            return true; 
        } 
    } 
    textOffset = 0; 
    size = 0; 
    return false; 
} 
  
bool MachOFile::canBeFairPlayEncrypted() const 
{ 
    return (findFairPlayEncryptionLoadCommand() != nullptr); 
} 
  
const encryption_info_command* MachOFile::findFairPlayEncryptionLoadCommand() const 
{ 
    __block const encryption_info_command* result = nullptr; 
    Diagnostics diag; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
         if ( (cmd->cmd == LC_ENCRYPTION_INFO) || (cmd->cmd == LC_ENCRYPTION_INFO_64) ) { 
            result = (encryption_info_command*)cmd; 
            stop = true; 
        } 
    }); 
    if ( diag.noError() ) 
        return result; 
    else 
        return nullptr; 
} 
  
  
bool MachOFile::hasLoadCommand(uint32_t cmdNum) const 
{ 
    __block bool hasLC = false; 
    Diagnostics diag; 
    forEachLoadCommand(diag, ^(const load_command* cmd, bool& stop) { 
        if ( cmd->cmd == cmdNum ) { 
            hasLC = true; 
            stop = true; 
        } 
    }); 
    return hasLC; 
} 
  
bool MachOFile::allowsAlternatePlatform() const 
{ 
    __block bool result = false; 
    forEachSection(^(const SectionInfo& info, bool malformedSectionRange, bool& stop) { 
        if ( (strcmp(info.sectName, "__allow_alt_plat") == 0) && (strncmp(info.segInfo.segName, "__DATA", 6) == 0) ) { 
            result = true; 
            stop = true; 
        } 
    }); 
    return result; 
} 
  
bool MachOFile::hasChainedFixups() const 
{ 
#if SUPPORT_ARCH_arm64e 
    // arm64e always uses chained fixups 
    if ( (this->cputype == CPU_TYPE_ARM64) && (this->maskedCpuSubtype() == CPU_SUBTYPE_ARM64E) ) { 
        // Not all binaries have fixups at all so check for the load commands 
        return hasLoadCommand(LC_DYLD_INFO_ONLY) || hasLoadCommand(LC_DYLD_CHAINED_FIXUPS); 
    } 
#endif 
    return hasLoadCommand(LC_DYLD_CHAINED_FIXUPS); 
} 
  
bool MachOFile::hasChainedFixupsLoadCommand() const 
{ 
    return hasLoadCommand(LC_DYLD_CHAINED_FIXUPS); 
} 
  
bool MachOFile::hasOpcodeFixups() const 
{ 
    return hasLoadCommand(LC_DYLD_INFO_ONLY) || hasLoadCommand(LC_DYLD_INFO) ; 
} 
  
uint64_t MachOFile::read_uleb128(Diagnostics& diag, const uint8_t*& p, const uint8_t* end) 
{ 
    uint64_t result = 0; 
    int         bit = 0; 
    do { 
        if ( p == end ) { 
            diag.error("malformed uleb128"); 
            break; 
        } 
        uint64_t slice = *p & 0x7f; 
  
        if ( bit > 63 ) { 
            diag.error("uleb128 too big for uint64"); 
            break; 
        } 
        else { 
            result |= (slice << bit); 
            bit += 7; 
        } 
    } 
    while (*p++ & 0x80); 
    return result; 
} 
  
  
int64_t MachOFile::read_sleb128(Diagnostics& diag, const uint8_t*& p, const uint8_t* end) 
{ 
    int64_t  result = 0; 
    int      bit = 0; 
    uint8_t  byte = 0; 
    do { 
        if ( p == end ) { 
            diag.error("malformed sleb128"); 
            break; 
        } 
        byte = *p++; 
        result |= (((int64_t)(byte & 0x7f)) << bit); 
        bit += 7; 
    } while (byte & 0x80); 
    // sign extend negative numbers 
    if ( ((byte & 0x40) != 0) && (bit < 64) ) 
        result |= (~0ULL) << bit; 
    return result; 
} 
  
  
const MachOFile* MachOFile::compatibleSlice(Diagnostics& diag, const void* fileContent, size_t contentSize, const char* path, Platform platform, bool isOSBinary, const GradedArchs& archs) 
{ 
    const MachOFile* mf = nullptr; 
    if ( const dyld3::FatFile* ff = dyld3::FatFile::isFatFile(fileContent) ) { 
        uint64_t  sliceOffset; 
        uint64_t  sliceLen; 
        bool      missingSlice; 
        if ( ff->isFatFileWithSlice(diag, contentSize, archs, isOSBinary, sliceOffset, sliceLen, missingSlice) ) { 
            mf = (MachOFile*)((long)fileContent + sliceOffset); 
        } 
        else { 
            char strBuf[256]; 
            diag.error("fat file, but missing compatible architecture (have '%s', need '%s')", ff->archNames(strBuf), archs.name()); 
            return nullptr; 
        } 
    } 
    else { 
        mf = (MachOFile*)fileContent; 
    } 
  
    if ( !mf->hasMachOMagic() || !mf->isMachO(diag, contentSize) ) { 
        diag.error("not a mach-o file"); 
        return nullptr; 
    } 
  
    if ( archs.grade(mf->cputype, mf->cpusubtype, isOSBinary) == 0 ) { 
        diag.error("mach-o file, but is an incompatible architecture (have '%s', need '%s')", mf->archName(), archs.name()); 
        return nullptr; 
    } 
  
    if ( !mf->loadableIntoProcess(platform, path) ) { 
        __block Platform havePlatform = Platform::unknown; 
        mf->forEachSupportedPlatform(^(Platform aPlat, uint32_t minOS, uint32_t sdk) { 
            havePlatform = aPlat; 
        }); 
        diag.error("mach-o file (%s), but incompatible platform (have '%s', need '%s')", path, MachOFile::platformName(havePlatform), MachOFile::platformName(platform)); 
        return nullptr; 
    } 
  
    return mf; 
} 
  
  
} // namespace dyld3 
}

Les références ont été largement partagées par les développeurs Rens Verhoeven et Steve Troughton-Smith sur Twitter. Verhoeven a tweeté :


Le tweet était accompagné d'une capture d'écran des journaux qui incluait "com.apple.platform.realityos" ainsi qu'une référence similaire pour une plateforme existante, "com.apple.platform.watchos".

Et tout en citant sur Twitter une légende de la découverte du référentiel GitHub par Nicolás Álvarez, Troughton-Smith a tweeté ce qui suit :


Les captures d'écran accompagnant ce tweet incluaient des commentaires de code tels que "// autoriser les exécutables iOS à utiliser les dylibs de realityOS" et "// autoriser les exécutables iOS_Sim à utiliser les dylibs de realityOS_Sim".

Le fait qu'Apple travaille sur une plateforme de réalité mixte n'est cependant pas nouveau. Basée sur des offres d'emploi sur le site Carrières d'Apple, de nombreux rapports fiables et d'autres sources, la plateforme de réalité mixte d'Apple est en développement depuis des années, avec une équipe de milliers de personnes.

La plateforme de réalité mixte a cependant fait face à plusieurs retards. Par exemple, Bloomberg a rapporté en 2017 que le premier casque d'Apple visait une date de sortie en 2019. Ce rapport a appelé le système d'exploitation personnalisé d'Apple pour les appareils de réalité mixte "rOS".

Des analystes comme Ming-chi Kuo et des journalistes comme Mark Gurman de Bloomberg affirment qu'un casque de réalité mixte haut de gamme arrive depuis un moment. Certains rapports indiquaient qu'un casque viendrait cette année, mais d'autres ont récemment affirmé qu'un casque pourrait arriver en 2023 à la place. Les détails sont flous et contradictoires.

Par exemple, Kuo a déclaré que l'appareil comportera son propre processeur équivalent à M1. Cela suggère qu'il peut être autonome et ne nécessitera pas d'iPhone ou de Mac à proximité. Mais un autre rapport récent a affirmé qu'Apple prévoyait de s'appuyer sur le traitement sur un appareil mobile à proximité.

Certaines de ces différences pourraient être dues au fait qu'Apple travaille sur au moins deux appareils différents. L'un devrait être un casque haut de gamme compatible VR pour le contenu immersif, c'est celui attendu cette année ou la prochaine. Un autre appareil serait des lunettes AR destinées à être portées en se promenant dans les espaces publics. Mais l'entreprise pourrait également encore expérimenter une variété de concepts de produits, avec des conceptions et des caractéristiques distinctives encore à finaliser.

Sources : code source, Rens, Steve

Et vous ?

Quelle lecture en faites-vous ?

Voir aussi :

Réalité virtuelle : le casque VR d'Apple pourrait coûter 3000 dollars, comporter des écrans 8K et plus d'une douzaine de caméras
Apple : bientôt des casques utilisant le port Lightening sur les iDevices ? Cupertino a ajouté des spécificités à son programme MFI

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