/*
 * Authors:
 *  Landon Fuller <landonf@plausiblelabs.com>
 *  Damian Morris <damian@moso.com.au>
 *  Andreas Linde <mail@andreaslinde.de>
 *
 * Copyright (c) 2008-2013 Plausible Labs Cooperative, Inc.
 * Copyright (c) 2010 MOSO Corporation, Pty Ltd.
 * Copyright (c) 2012-2014 HockeyApp, Bit Stadium GmbH.
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#import "HockeySDK.h"
#import "HockeySDKPrivate.h"

#if HOCKEYSDK_FEATURE_CRASH_REPORTER

#import <CrashReporter/CrashReporter.h>

#import <mach-o/dyld.h>
#import <mach-o/getsect.h>
#import <mach-o/ldsyms.h>
#import <dlfcn.h>
#import <Availability.h>

#if defined(__OBJC2__)
#define SEL_NAME_SECT "__objc_methname"
#else
#define SEL_NAME_SECT "__cstring"
#endif

#import "BITCrashReportTextFormatter.h"

/*
 * XXX: The ARM64 CPU type, and ARM_V7S and ARM_V8 Mach-O CPU subtypes are not
 * defined in the Mac OS X 10.8 headers.
 */
#ifndef CPU_SUBTYPE_ARM_V7S
# define CPU_SUBTYPE_ARM_V7S 11
#endif

#ifndef CPU_TYPE_ARM64
#define CPU_TYPE_ARM64 (CPU_TYPE_ARM | CPU_ARCH_ABI64)
#endif

#ifndef CPU_SUBTYPE_ARM_V8
# define CPU_SUBTYPE_ARM_V8 13
#endif

/**
 * Sort PLCrashReportBinaryImageInfo instances by their starting address.
 */
static NSInteger bit_binaryImageSort(id binary1, id binary2, void *__unused context) {
  uint64_t addr1 = [binary1 imageBaseAddress];
  uint64_t addr2 = [binary2 imageBaseAddress];
  
  if (addr1 < addr2)
    return NSOrderedAscending;
  else if (addr1 > addr2)
    return NSOrderedDescending;
  else
    return NSOrderedSame;
}

/**
 * Validates that the given @a string terminates prior to @a limit.
 */
static const char *safer_string_read (const char *string, const char *limit) {
  const char *p = string;
  do {
    if (p >= limit || p+1 >= limit) {
      return NULL;
    }
    p++;
  } while (*p != '\0');
  
  return string;
}

/*
 * The relativeAddress should be `<ecx/rsi/r1/x1 ...> - <image base>`, extracted from the crash report's thread
 * and binary image list.
 *
 * For the (architecture-specific) registers to attempt, see:
 *  http://sealiesoftware.com/blog/archive/2008/09/22/objc_explain_So_you_crashed_in_objc_msgSend.html
 */
static const char *findSEL (const char *imageName, NSString *imageUUID, uint64_t relativeAddress) {
  unsigned int images_count = _dyld_image_count();
  for (unsigned int i = 0; i < images_count; ++i) {
    intptr_t slide = _dyld_get_image_vmaddr_slide(i);
    const struct mach_header *header = _dyld_get_image_header(i);
    const struct mach_header_64 *header64 = (const struct mach_header_64 *) header;
    const char *name = _dyld_get_image_name(i);
    
    /* Image disappeared? */
    if (name == NULL || header == NULL)
      continue;
    
    /* Check if this is the correct image. If we were being even more careful, we'd check the LC_UUID */
    if (strcmp(name, imageName) != 0)
      continue;

    /* Determine whether this is a 64-bit or 32-bit Mach-O file */
    BOOL m64 = NO;
    if (header->magic == MH_MAGIC_64)
      m64 = YES;

    NSString *uuidString = nil;
    const uint8_t *command;
    uint32_t	ncmds;
    
    if (m64) {
      command = (const uint8_t *)(header64 + 1);
      ncmds = header64->ncmds;
    } else {
      command = (const uint8_t *)(header + 1);
      ncmds = header->ncmds;
    }
    for (uint32_t idx = 0; idx < ncmds; ++idx) {
      const struct load_command *load_command = (const struct load_command *)command;
      if (load_command->cmd == LC_UUID) {
        const struct uuid_command *uuid_command = (const struct uuid_command *)command;
        const uint8_t *uuid = uuid_command->uuid;
        uuidString = [[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
                       uuid[0], uuid[1], uuid[2], uuid[3],
                       uuid[4], uuid[5], uuid[6], uuid[7],
                       uuid[8], uuid[9], uuid[10], uuid[11],
                       uuid[12], uuid[13], uuid[14], uuid[15]]
                      lowercaseString];
        break;
      } else {
        command += load_command->cmdsize;
      }
    }

    // Check if this is the correct image by comparing the UUIDs
    if (!uuidString || ![uuidString isEqualToString:imageUUID])
      continue;
        
    /* Fetch the __objc_methname section */
    const char *methname_sect;
    uint64_t methname_sect_size;
    if (m64) {
      methname_sect = getsectdatafromheader_64(header64, SEG_TEXT, SEL_NAME_SECT, &methname_sect_size);
    } else {
      uint32_t meth_size_32;
      methname_sect = getsectdatafromheader(header, SEG_TEXT, SEL_NAME_SECT, &meth_size_32);
      methname_sect_size = meth_size_32;
    }
    
    /* Apply the slide, as per getsectdatafromheader(3) */
    methname_sect += slide;
    
    if (methname_sect == NULL) {
      return NULL;
    }
    
    /* Calculate the target address within this image, and verify that it is within __objc_methname */
    const char *target = ((const char *)header) + relativeAddress;
    const char *limit = methname_sect + methname_sect_size;
    if (target < methname_sect || target >= limit) {
      return NULL;
    }
    
    /* Read the actual method name */
    return safer_string_read(target, limit);
  }
  
  return NULL;
}

/**
 * Formats PLCrashReport data as human-readable text.
 */
@implementation BITCrashReportTextFormatter

static NSString *const BITXamarinStackTraceDelimiter = @"Xamarin Exception Stack:";

/**
 * Formats the provided @a report as human-readable text in the given @a textFormat, and return
 * the formatted result as a string.
 *
 * @param report The report to format.
 * @param crashReporterKey The crash reporter key.
 *
 * @return Returns the formatted result on success, or nil if an error occurs.
 */
+ (NSString *)stringValueForCrashReport:(BITPLCrashReport *)report crashReporterKey:(NSString *)crashReporterKey {
	NSMutableString* text = [NSMutableString string];
	boolean_t lp64 = true; // quiesce GCC uninitialized value warning
  
	/* Header */
	
  /* Map to apple style OS name */
  NSString *osName;
  switch (report.systemInfo.operatingSystem) {
    case PLCrashReportOperatingSystemMacOSX:
      osName = @"Mac OS X";
      break;
    case PLCrashReportOperatingSystemiPhoneOS:
      osName = @"iPhone OS";
      break;
    case PLCrashReportOperatingSystemiPhoneSimulator:
      osName = @"Mac OS X";
      break;
    default:
      osName = [NSString stringWithFormat: @"Unknown (%d)", report.systemInfo.operatingSystem];
      break;
  }
  
  /* Map to Apple-style code type, and mark whether architecture is LP64 (64-bit) */
  NSString *codeType = nil;
  {
    /* Attempt to derive the code type from the binary images */
    for (BITPLCrashReportBinaryImageInfo *image in report.images) {
      /* Skip images with no specified type */
      if (image.codeType == nil)
        continue;
      
      /* Skip unknown encodings */
      if (image.codeType.typeEncoding != PLCrashReportProcessorTypeEncodingMach)
        continue;
      
      switch (image.codeType.type) {
        case CPU_TYPE_ARM:
          codeType = @"ARM";
          lp64 = false;
          break;
          
        case CPU_TYPE_ARM64:
          codeType = @"ARM-64";
          lp64 = true;
          break;
          
        case CPU_TYPE_X86:
          codeType = @"X86";
          lp64 = false;
          break;
          
        case CPU_TYPE_X86_64:
          codeType = @"X86-64";
          lp64 = true;
          break;
          
        case CPU_TYPE_POWERPC:
          codeType = @"PPC";
          lp64 = false;
          break;
          
        default:
          // Do nothing, handled below.
          break;
      }
      
      /* Stop immediately if code type was discovered */
      if (codeType != nil)
        break;
    }
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
    /* If we were unable to determine the code type, fall back on the legacy architecture value. */
    if (codeType == nil) {
      switch (report.systemInfo.architecture) {
        case PLCrashReportArchitectureARMv6:
        case PLCrashReportArchitectureARMv7:
          codeType = @"ARM";
          lp64 = false;
          break;
        case PLCrashReportArchitectureX86_32:
          codeType = @"X86";
          lp64 = false;
          break;
        case PLCrashReportArchitectureX86_64:
          codeType = @"X86-64";
          lp64 = true;
          break;
        case PLCrashReportArchitecturePPC:
          codeType = @"PPC";
          lp64 = false;
          break;
        default:
          codeType = [NSString stringWithFormat: @"Unknown (%d)", report.systemInfo.architecture];
          lp64 = true;
          break;
      }
    }
#pragma GCC diagnostic pop
  }
  
  {
    NSString *reporterKey = @"???";
    if (crashReporterKey && [crashReporterKey length] > 0)
      reporterKey = crashReporterKey;
    
    NSString *hardwareModel = @"???";
    if (report.hasMachineInfo && report.machineInfo.modelName != nil)
      hardwareModel = report.machineInfo.modelName;
    
    NSString *incidentIdentifier = @"???";
    if (report.uuidRef != NULL) {
      incidentIdentifier = (NSString *) CFBridgingRelease(CFUUIDCreateString(NULL, report.uuidRef));
    }
    
    [text appendFormat: @"Incident Identifier: %@\n", incidentIdentifier];
    [text appendFormat: @"CrashReporter Key:   %@\n", reporterKey];
    [text appendFormat: @"Hardware Model:      %@\n", hardwareModel];
  }
  
  /* Application and process info */
  {
    NSString *unknownString = @"???";
    
    NSString *processName = unknownString;
    NSString *processId = unknownString;
    NSString *processPath = unknownString;
    NSString *parentProcessName = unknownString;
    NSString *parentProcessId = unknownString;
    
    /* Process information was not available in earlier crash report versions */
    if (report.hasProcessInfo) {
      /* Process Name */
      if (report.processInfo.processName != nil)
        processName = report.processInfo.processName;
      
      /* PID */
      processId = [@(report.processInfo.processID) stringValue];
      
      /* Process Path */
      if (report.processInfo.processPath != nil) {
        processPath = report.processInfo.processPath;
        
        /* Remove username from the path */
#if TARGET_OS_SIMULATOR
        processPath = [self anonymizedPathFromPath:processPath];
#endif
      }
      
      /* Parent Process Name */
      if (report.processInfo.parentProcessName != nil)
        parentProcessName = report.processInfo.parentProcessName;
      
      /* Parent Process ID */
      parentProcessId = [@(report.processInfo.parentProcessID) stringValue];
    }
    
    [text appendFormat: @"Process:         %@ [%@]\n", processName, processId];
    [text appendFormat: @"Path:            %@\n", processPath];
    [text appendFormat: @"Identifier:      %@\n", report.applicationInfo.applicationIdentifier];

    NSString *marketingVersion = report.applicationInfo.applicationMarketingVersion;
    NSString *appVersion = report.applicationInfo.applicationVersion;
    NSString *versionString = marketingVersion ? [NSString stringWithFormat:@"%@ (%@)", marketingVersion, appVersion] : appVersion;
    
    [text appendFormat: @"Version:         %@\n", versionString];
    [text appendFormat: @"Code Type:       %@\n", codeType];
    [text appendFormat: @"Parent Process:  %@ [%@]\n", parentProcessName, parentProcessId];
  }
  
  [text appendString: @"\n"];
  
  NSString *xamarinTrace;
  NSString *exceptionReason;
  
  /* System info */
  {
    NSString *osBuild = @"???";
    if (report.systemInfo.operatingSystemBuild != nil)
      osBuild = report.systemInfo.operatingSystemBuild;
    
    NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
    NSDateFormatter *rfc3339Formatter = [[NSDateFormatter alloc] init];
    [rfc3339Formatter setLocale:enUSPOSIXLocale];
    [rfc3339Formatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
    [rfc3339Formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    
    [text appendFormat: @"Date/Time:       %@\n", [rfc3339Formatter stringFromDate:report.systemInfo.timestamp]];
    if ([report.processInfo respondsToSelector:@selector(processStartTime)]) {
      if (report.systemInfo.timestamp && report.processInfo.processStartTime) {
        [text appendFormat: @"Launch Time:     %@\n", [rfc3339Formatter stringFromDate:report.processInfo.processStartTime]];
      }
    }
    [text appendFormat: @"OS Version:      %@ %@ (%@)\n", osName, report.systemInfo.operatingSystemVersion, osBuild];
    
    // Check if exception data contains xamarin stacktrace in order to determine report version
    if (report.hasExceptionInfo) {
      exceptionReason = report.exceptionInfo.exceptionReason;
      NSInteger xamarinTracePosition = [exceptionReason rangeOfString:BITXamarinStackTraceDelimiter].location;
      if (xamarinTracePosition != NSNotFound) {
        xamarinTrace = [exceptionReason substringFromIndex:xamarinTracePosition];
        xamarinTrace = [xamarinTrace stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        xamarinTrace = [xamarinTrace stringByReplacingOccurrencesOfString:@"<---\n\n--->" withString:@"<---\n--->"];
        exceptionReason = [exceptionReason substringToIndex:xamarinTracePosition];
        exceptionReason = [exceptionReason stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
      }
    }
    NSString *reportVersion = (xamarinTrace) ? @"104-Xamarin" : @"104";
    [text appendFormat: @"Report Version:  %@\n", reportVersion];
  }
  
  [text appendString: @"\n"];
  
  /* Exception code */
  [text appendFormat: @"Exception Type:  %@\n", report.signalInfo.name];
  [text appendFormat: @"Exception Codes: %@ at 0x%" PRIx64 "\n", report.signalInfo.code, report.signalInfo.address];
  
  for (BITPLCrashReportThreadInfo *thread in report.threads) {
    if (thread.crashed) {
      [text appendFormat: @"Crashed Thread:  %ld\n", (long) thread.threadNumber];
      break;
    }
  }
  
  [text appendString: @"\n"];
  
  BITPLCrashReportThreadInfo *crashed_thread = nil;
  for (BITPLCrashReportThreadInfo *thread in report.threads) {
    if (thread.crashed) {
      crashed_thread = thread;
      break;
    }
  }
  
  /* Uncaught Exception */
  if (report.hasExceptionInfo) {
    [text appendFormat: @"Application Specific Information:\n"];
    [text appendFormat: @"*** Terminating app due to uncaught exception '%@', reason: '%@'\n",
    report.exceptionInfo.exceptionName, exceptionReason];
    [text appendString: @"\n"];
    
    /* Xamarin Exception */
    if (xamarinTrace) {
      [text appendFormat:@"%@\n", xamarinTrace];
      [text appendString: @"\n"];
    }
    
  } else if (crashed_thread != nil) {
    // try to find the selector in case this was a crash in obj_msgSend
    // we search this whether the crash happened in obj_msgSend or not since we don't have the symbol!
    
    NSString *foundSelector = nil;

    // search the registers value for the current arch
#if TARGET_OS_SIMULATOR
    if (lp64) {
      foundSelector = [[self class] selectorForRegisterWithName:@"rsi" ofThread:crashed_thread report:report];
      if (foundSelector == NULL)
        foundSelector = [[self class] selectorForRegisterWithName:@"rdx" ofThread:crashed_thread report:report];
    } else {
      foundSelector = [[self class] selectorForRegisterWithName:@"ecx" ofThread:crashed_thread report:report];
    }
#else
    if (lp64) {
      foundSelector = [[self class] selectorForRegisterWithName:@"x1" ofThread:crashed_thread report:report];
    } else {
      foundSelector = [[self class] selectorForRegisterWithName:@"r1" ofThread:crashed_thread report:report];
      if (foundSelector == NULL)
        foundSelector = [[self class] selectorForRegisterWithName:@"r2" ofThread:crashed_thread report:report];
    }
#endif
    
    if (foundSelector) {
      [text appendFormat: @"Application Specific Information:\n"];
      [text appendFormat: @"Selector name found in current argument registers: %@\n", foundSelector];
      [text appendString: @"\n"];
    }
  }
  
  /* If an exception stack trace is available, output an Apple-compatible backtrace. */
  if (report.exceptionInfo != nil && report.exceptionInfo.stackFrames != nil && [report.exceptionInfo.stackFrames count] > 0) {
    BITPLCrashReportExceptionInfo *exception = report.exceptionInfo;
    
    /* Create the header. */
    [text appendString: @"Last Exception Backtrace:\n"];
    
    /* Write out the frames. In raw reports, Apple writes this out as a simple list of PCs. In the minimally
     * post-processed report, Apple writes this out as full frame entries. We use the latter format. */
    for (NSUInteger frame_idx = 0; frame_idx < [exception.stackFrames count]; frame_idx++) {
      BITPLCrashReportStackFrameInfo *frameInfo = exception.stackFrames[frame_idx];
      [text appendString: [[self class] bit_formatStackFrame: frameInfo frameIndex: frame_idx report: report lp64: lp64]];
    }
    [text appendString: @"\n"];
  }
  
  /* Threads */
  NSInteger maxThreadNum = 0;
  for (BITPLCrashReportThreadInfo *thread in report.threads) {
    if (thread.crashed) {
      [text appendFormat: @"Thread %ld Crashed:\n", (long) thread.threadNumber];
    } else {
      [text appendFormat: @"Thread %ld:\n", (long) thread.threadNumber];
    }
    for (NSUInteger frame_idx = 0; frame_idx < [thread.stackFrames count]; frame_idx++) {
      BITPLCrashReportStackFrameInfo *frameInfo = thread.stackFrames[frame_idx];
      [text appendString:[[self class] bit_formatStackFrame:frameInfo frameIndex:frame_idx report:report lp64:lp64]];
    }
    [text appendString: @"\n"];
    
    /* Track the highest thread number */
    maxThreadNum = MAX(maxThreadNum, thread.threadNumber);
  }
  
  /* Registers */
  if (crashed_thread != nil) {
    [text appendFormat: @"Thread %ld crashed with %@ Thread State:\n", (long) crashed_thread.threadNumber, codeType];
    
    int regColumn = 0;
    for (BITPLCrashReportRegisterInfo *reg in crashed_thread.registers) {
      NSString *reg_fmt;
      
      /* Use 32-bit or 64-bit fixed width format for the register values */
      if (lp64)
        reg_fmt = @"%6s: 0x%016" PRIx64 " ";
      else
        reg_fmt = @"%6s: 0x%08" PRIx64 " ";
      
      /* Remap register names to match Apple's crash reports */
      NSString *regName = reg.registerName;
      if (report.machineInfo != nil && report.machineInfo.processorInfo.typeEncoding == PLCrashReportProcessorTypeEncodingMach) {
        BITPLCrashReportProcessorInfo *pinfo = report.machineInfo.processorInfo;
        cpu_type_t arch_type = (cpu_type_t)(pinfo.type & ~CPU_ARCH_MASK);
        
        /* Apple uses 'ip' rather than 'r12' on ARM */
        if (arch_type == CPU_TYPE_ARM && [regName isEqual: @"r12"]) {
          regName = @"ip";
        }
      }
      [text appendFormat: reg_fmt, [regName UTF8String], reg.registerValue];
      
      regColumn++;
      if (regColumn == 4) {
        [text appendString: @"\n"];
        regColumn = 0;
      }
    }
    
    if (regColumn != 0)
      [text appendString: @"\n"];
    
    [text appendString: @"\n"];
  }
  
  /* Images. The iPhone crash report format sorts these in ascending order, by the base address */
  [text appendString: @"Binary Images:\n"];
  NSMutableArray *addedImagesBaseAddresses = @[].mutableCopy;
  for (BITPLCrashReportBinaryImageInfo *imageInfo in [report.images sortedArrayUsingFunction: bit_binaryImageSort context: nil]) {
    // Make sure we don't add duplicates
    if ([addedImagesBaseAddresses containsObject:@(imageInfo.imageBaseAddress)]) {
      continue;
    } else {
      [addedImagesBaseAddresses addObject:@(imageInfo.imageBaseAddress)];
    }
    
    NSString *uuid;
    /* Fetch the UUID if it exists */
    if (imageInfo.hasImageUUID)
      uuid = imageInfo.imageUUID;
    else
      uuid = @"???";
    
    /* Determine the architecture string */
    NSString *archName = [[self class] bit_archNameFromImageInfo:imageInfo];
    
    /* Determine if this is the main executable or an app specific framework*/
    NSString *binaryDesignator = @" ";
    BITBinaryImageType imageType = [[self class] bit_imageTypeForImagePath:imageInfo.imageName
                                                               processPath:report.processInfo.processPath];
    if (imageType != BITBinaryImageTypeOther) {
        binaryDesignator = @"+";
    }
    
    /* base_address - terminating_address [designator]file_name arch <uuid> file_path */
    NSString *fmt = nil;
    if (lp64) {
      fmt = @"%18#" PRIx64 " - %18#" PRIx64 " %@%@ %@  <%@> %@\n";
    } else {
      fmt = @"%10#" PRIx64 " - %10#" PRIx64 " %@%@ %@  <%@> %@\n";
    }
    
    /* Remove username from the image path */
    NSString *imageName = @"";
    if (imageInfo.imageName && [imageInfo.imageName length] > 0) {
#if TARGET_OS_SIMULATOR
      imageName = [imageInfo.imageName stringByAbbreviatingWithTildeInPath];
#else
      imageName = imageInfo.imageName;
#endif
    }
#if TARGET_OS_SIMULATOR
    imageName = [self anonymizedPathFromPath:imageName];
#endif
    [text appendFormat: fmt,
     imageInfo.imageBaseAddress,
     imageInfo.imageBaseAddress + (MAX(1U, imageInfo.imageSize) - 1), // The Apple format uses an inclusive range
     binaryDesignator,
     [imageInfo.imageName lastPathComponent],
     archName,
     uuid,
     imageName];
  }
  
  
  return text;
}

/**
 *  Return the selector string of a given register name
 *
 *  @param regName The name of the register to use for getting the address
 *  @param thread  The crashed thread
 *  @param report  The crash report.
 *
 *  @return The selector as a C string or NULL if no selector was found
 */
+ (NSString *)selectorForRegisterWithName:(NSString *)regName ofThread:(BITPLCrashReportThreadInfo *)thread report:(BITPLCrashReport *)report {
  // get the address for the register
  uint64_t regAddress = 0;
  
  for (BITPLCrashReportRegisterInfo *reg in thread.registers) {
    if ([reg.registerName isEqualToString:regName]) {
      regAddress = reg.registerValue;
      break;
    }
  }
  
  if (regAddress == 0)
    return nil;
  
  BITPLCrashReportBinaryImageInfo *imageForRegAddress = [report imageForAddress:regAddress];
  if (imageForRegAddress) {
    // get the SEL
    const char *foundSelector = findSEL([imageForRegAddress.imageName UTF8String], imageForRegAddress.imageUUID, regAddress - (uint64_t)imageForRegAddress.imageBaseAddress);
    
    if (foundSelector != NULL) {
      return [NSString stringWithUTF8String:foundSelector];
    }
  }
    
  return nil;
}


/**
 * Returns an array of app UUIDs and their architecture
 * As a dictionary for each element
 *
 * @param report The report to format.
 *
 * @return Returns the formatted result on success, or nil if an error occurs.
 */
+ (NSArray *)arrayOfAppUUIDsForCrashReport:(BITPLCrashReport *)report {
	NSMutableArray* appUUIDs = [NSMutableArray array];
  
  /* Images. The iPhone crash report format sorts these in ascending order, by the base address */
  for (BITPLCrashReportBinaryImageInfo *imageInfo in [report.images sortedArrayUsingFunction: bit_binaryImageSort context: nil]) {
    NSString *uuid;
    /* Fetch the UUID if it exists */
    uuid = imageInfo.hasImageUUID ? imageInfo.imageUUID : @"???";
    
    /* Determine the architecture string */
    NSString *archName = [[self class] bit_archNameFromImageInfo:imageInfo];

    /* Determine if this is the app executable or app specific framework */
    BITBinaryImageType imageType = [[self class] bit_imageTypeForImagePath:imageInfo.imageName
                                                               processPath:report.processInfo.processPath];
    if (imageType != BITBinaryImageTypeOther) {
      NSString *imageTypeString;

      if (imageType == BITBinaryImageTypeAppBinary) {
        imageTypeString = @"app";
      } else {
        imageTypeString = @"framework";
      }
      
      [appUUIDs addObject:@{kBITBinaryImageKeyUUID: uuid,
                            kBITBinaryImageKeyArch: archName,
                            kBITBinaryImageKeyType: imageTypeString}
       ];
    }
  }
  
  return appUUIDs;
}

/* Determine if in binary image is the app executable or app specific framework */
+ (BITBinaryImageType)bit_imageTypeForImagePath:(NSString *)imagePath processPath:(NSString *)processPath {
  if (!imagePath || !processPath) {
    return BITBinaryImageTypeOther;
  }
  BITBinaryImageType imageType = BITBinaryImageTypeOther;
  
  NSString *standardizedImagePath = [[imagePath stringByStandardizingPath] lowercaseString];
  NSString *lowercaseImagePath = [imagePath lowercaseString];
  NSString *lowercaseProcessPath = [processPath lowercaseString];
  
  NSRange appRange = [standardizedImagePath rangeOfString: @".app/"];
  
  // Exclude iOS swift dylibs. These are provided as part of the app binary by Xcode for now, but we never get a dSYM for those.
  NSRange swiftLibRange = [standardizedImagePath rangeOfString:@"frameworks/libswift"];
  BOOL dylibSuffix = [standardizedImagePath hasSuffix:@".dylib"];
  
  if (appRange.location != NSNotFound && !(swiftLibRange.location != NSNotFound && dylibSuffix)) {
    NSString *appBundleContentsPath = [standardizedImagePath substringToIndex:appRange.location + 5];
    
    if ([standardizedImagePath isEqual: lowercaseProcessPath] ||
        // Fix issue with iOS 8 `stringByStandardizingPath` removing leading `/private` path (when not running in the debugger or simulator only)
        [lowercaseImagePath hasPrefix:lowercaseProcessPath]) {
      imageType = BITBinaryImageTypeAppBinary;
    } else if ([standardizedImagePath hasPrefix:appBundleContentsPath] ||
                // Fix issue with iOS 8 `stringByStandardizingPath` removing leading `/private` path (when not running in the debugger or simulator only)
               [lowercaseImagePath hasPrefix:appBundleContentsPath]) {
      imageType = BITBinaryImageTypeAppFramework;
    }
  }
  
  return imageType;
}

+ (NSString *)bit_archNameFromImageInfo:(BITPLCrashReportBinaryImageInfo *)imageInfo
{
  NSString *archName = @"???";
  if (imageInfo.codeType != nil && imageInfo.codeType.typeEncoding == PLCrashReportProcessorTypeEncodingMach) {
    archName = [BITCrashReportTextFormatter bit_archNameFromCPUType:imageInfo.codeType.type subType:imageInfo.codeType.subtype];
  }
  
  return archName;
}

+ (NSString *)bit_archNameFromCPUType:(uint64_t)cpuType subType:(uint64_t)subType {
  NSString *archName = @"???";
  switch (cpuType) {
    case CPU_TYPE_ARM:
      /* Apple includes subtype for ARM binaries. */
      switch (subType) {
        case CPU_SUBTYPE_ARM_V6:
          archName = @"armv6";
          break;
          
        case CPU_SUBTYPE_ARM_V7:
          archName = @"armv7";
          break;
          
        case CPU_SUBTYPE_ARM_V7S:
          archName = @"armv7s";
          break;
          
        default:
          archName = @"arm-unknown";
          break;
      }
      break;
      
    case CPU_TYPE_ARM64:
      /* Apple includes subtype for ARM64 binaries. */
      switch (subType) {
        case CPU_SUBTYPE_ARM_ALL:
          archName = @"arm64";
          break;
          
        case CPU_SUBTYPE_ARM_V8:
          archName = @"arm64";
          break;
          
        default:
          archName = @"arm64-unknown";
          break;
      }
      break;
      
    case CPU_TYPE_X86:
      archName = @"i386";
      break;
      
    case CPU_TYPE_X86_64:
      archName = @"x86_64";
      break;
      
    case CPU_TYPE_POWERPC:
      archName = @"powerpc";
      break;
      
    default:
      // Use the default archName value (initialized above).
      break;
  }

  return archName;
}


/**
 * Format a stack frame for display in a thread backtrace.
 *
 * @param frameInfo The stack frame to format
 * @param frameIndex The frame's index
 * @param report The report from which this frame was acquired.
 * @param lp64 If YES, the report was generated by an LP64 system.
 *
 * @return Returns a formatted frame line.
 */
+ (NSString *)bit_formatStackFrame: (BITPLCrashReportStackFrameInfo *) frameInfo
                        frameIndex: (NSUInteger) frameIndex
                            report: (BITPLCrashReport *) report
                              lp64: (boolean_t) lp64
{
  /* Base image address containing instrumentation pointer, offset of the IP from that base
   * address, and the associated image name */
  uint64_t baseAddress = 0x0;
  uint64_t pcOffset = 0x0;
  NSString *imageName = @"\?\?\?";
  NSString *symbolString = nil;
  
  BITPLCrashReportBinaryImageInfo *imageInfo = [report imageForAddress: frameInfo.instructionPointer];
  if (imageInfo != nil) {
    imageName = [imageInfo.imageName lastPathComponent];
    baseAddress = imageInfo.imageBaseAddress;
    pcOffset = frameInfo.instructionPointer - imageInfo.imageBaseAddress;
  }
  
  /* Make sure UTF8/16 characters are handled correctly */
  NSInteger offset = 0;
  NSUInteger index = 0;
  for (index = 0; index < [imageName length]; index++) {
    NSRange range = [imageName rangeOfComposedCharacterSequenceAtIndex:index];
    if (range.length > 1) {
      offset += range.length - 1;
      index += range.length - 1;
    }
    if (index > 32) {
      imageName = [NSString stringWithFormat:@"%@... ", [imageName substringToIndex:index - 1]];
      index += 3;
      break;
    }
  }
  if (index-offset < 36) {
    imageName = [imageName stringByPaddingToLength:(NSUInteger)(36 + offset) withString:@" " startingAtIndex:0];
  }
  
  /* If symbol info is available, the format used in Apple's reports is Sym + OffsetFromSym. Otherwise,
   * the format used is imageBaseAddress + offsetToIP */
  BITBinaryImageType imageType = [[self class] bit_imageTypeForImagePath:imageInfo.imageName
                                                             processPath:report.processInfo.processPath];
  if (frameInfo.symbolInfo != nil && imageType == BITBinaryImageTypeOther) {
    NSString *symbolName = frameInfo.symbolInfo.symbolName;
    
    /* Apple strips the _ symbol prefix in their reports. Only OS X makes use of an
     * underscore symbol prefix by default. */
    if ([symbolName rangeOfString: @"_"].location == 0 && [symbolName length] > 1) {
      switch (report.systemInfo.operatingSystem) {
        case PLCrashReportOperatingSystemMacOSX:
        case PLCrashReportOperatingSystemiPhoneOS:
        case PLCrashReportOperatingSystemiPhoneSimulator:
          symbolName = [symbolName substringFromIndex: 1];
          break;
          
        default:
          BITHockeyLogDebug(@"Symbol prefix rules are unknown for this OS!");
          break;
      }
    }
    
    
    uint64_t symOffset = frameInfo.instructionPointer - frameInfo.symbolInfo.startAddress;
    symbolString = [NSString stringWithFormat: @"%@ + %" PRId64, symbolName, symOffset];
  } else {
    symbolString = [NSString stringWithFormat: @"0x%" PRIx64 " + %" PRId64, baseAddress, pcOffset];
  }
  
  /* Note that width specifiers are ignored for %@, but work for C strings.
   * UTF-8 is not correctly handled with %s (it depends on the system encoding), but
   * UTF-16 is supported via %S, so we use it here */
  return [NSString stringWithFormat: @"%-4ld%-35S 0x%0*" PRIx64 " %@\n",
          (long) frameIndex,
          (const uint16_t *)[imageName cStringUsingEncoding: NSUTF16StringEncoding],
          lp64 ? 16 : 8, frameInfo.instructionPointer,
          symbolString];
}

/**
 *  Remove the user's name from a crash's process path.
 *  This is only necessary when sending crashes from the simulator as the path
 *  then contains the username of the Mac the simulator is running on.
 *
 *  @param path A string containing the username.
 *
 *  @return An anonymized string where the real username is replaced by "USER"
 */
+ (NSString *)anonymizedPathFromPath:(NSString *)path {
  
  NSString *anonymizedProcessPath = [NSString string];
  
  if (([path length] > 0) && [path hasPrefix:@"/Users/"]) {
    NSError *error = nil;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(/Users/[^/]+/)" options:0 error:&error];
    anonymizedProcessPath = [regex stringByReplacingMatchesInString:path options:0 range:NSMakeRange(0, [path length]) withTemplate:@"/Users/USER/"];
    if (error) {
      BITHockeyLogError(@"ERROR: String replacing failed - %@", error.localizedDescription);
    }
  }
  else if(([path length] > 0) && (![path containsString:@"Users"])) {
    return path;
  }
  return anonymizedProcessPath;
}

@end

#endif /* HOCKEYSDK_FEATURE_CRASH_REPORTER */