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class-dump.m
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class-dump.m
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// -*- mode: ObjC -*-
// This file is part of class-dump, a utility for examining the Objective-C segment of Mach-O files.
// Copyright (C) 1997-1998, 2000-2001, 2004-2015 Steve Nygard.
#include <stdio.h>
#include <libc.h>
#include <unistd.h>
#include <getopt.h>
#include <stdlib.h>
#include <mach-o/arch.h>
#import "CDClassDump.h"
#import "CDFindMethodVisitor.h"
#import "CDClassDumpVisitor.h"
#import "CDMultiFileVisitor.h"
#import "CDFile.h"
#import "CDMachOFile.h"
#import "CDFatFile.h"
#import "CDFatArch.h"
#import "CDSearchPathState.h"
void print_usage(void)
{
fprintf(stderr,
"class-dump %s\n"
"Usage: class-dump [options] <mach-o-file>\n"
"\n"
" where options are:\n"
" -a show instance variable offsets\n"
" -A show implementation addresses\n"
" --arch <arch> choose a specific architecture from a universal binary (ppc, ppc64, i386, x86_64, armv6, armv7, armv7s, arm64)\n"
" -C <regex> only display classes matching regular expression\n"
" -f <str> find string in method name\n"
" -H generate header files in current directory, or directory specified with -o\n"
" -I sort classes, categories, and protocols by inheritance (overrides -s)\n"
" -o <dir> output directory used for -H\n"
" -r recursively expand frameworks and fixed VM shared libraries\n"
" -s sort classes and categories by name\n"
" -S sort methods by name\n"
" -t suppress header in output, for testing\n"
" --list-arches list the arches in the file, then exit\n"
" --sdk-ios specify iOS SDK version (will look for /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS<version>.sdk\n"
" or /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS<version>.sdk)\n"
" --sdk-mac specify Mac OS X version (will look for /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX<version>.sdk\n"
" or /Developer/SDKs/MacOSX<version>.sdk)\n"
" --sdk-root specify the full SDK root path (or use --sdk-ios/--sdk-mac for a shortcut)\n"
,
CLASS_DUMP_VERSION
);
}
#define CD_OPT_ARCH 1
#define CD_OPT_LIST_ARCHES 2
#define CD_OPT_VERSION 3
#define CD_OPT_SDK_IOS 4
#define CD_OPT_SDK_MAC 5
#define CD_OPT_SDK_ROOT 6
#define CD_OPT_HIDE 7
int main(int argc, char *argv[])
{
@autoreleasepool {
NSString *searchString;
BOOL shouldGenerateSeparateHeaders = NO;
BOOL shouldListArches = NO;
BOOL shouldPrintVersion = NO;
CDArch targetArch;
BOOL hasSpecifiedArch = NO;
NSString *outputPath;
NSMutableSet *hiddenSections = [NSMutableSet set];
int ch;
BOOL errorFlag = NO;
struct option longopts[] = {
{ "show-ivar-offsets", no_argument, NULL, 'a' },
{ "show-imp-addr", no_argument, NULL, 'A' },
{ "match", required_argument, NULL, 'C' },
{ "find", required_argument, NULL, 'f' },
{ "generate-multiple-files", no_argument, NULL, 'H' },
{ "sort-by-inheritance", no_argument, NULL, 'I' },
{ "output-dir", required_argument, NULL, 'o' },
{ "recursive", no_argument, NULL, 'r' },
{ "sort", no_argument, NULL, 's' },
{ "sort-methods", no_argument, NULL, 'S' },
{ "arch", required_argument, NULL, CD_OPT_ARCH },
{ "list-arches", no_argument, NULL, CD_OPT_LIST_ARCHES },
{ "suppress-header", no_argument, NULL, 't' },
{ "version", no_argument, NULL, CD_OPT_VERSION },
{ "sdk-ios", required_argument, NULL, CD_OPT_SDK_IOS },
{ "sdk-mac", required_argument, NULL, CD_OPT_SDK_MAC },
{ "sdk-root", required_argument, NULL, CD_OPT_SDK_ROOT },
{ "hide", required_argument, NULL, CD_OPT_HIDE },
{ NULL, 0, NULL, 0 },
};
if (argc == 1) {
print_usage();
exit(0);
}
CDClassDump *classDump = [[CDClassDump alloc] init];
while ( (ch = getopt_long(argc, argv, "aAC:f:HIo:rRsSt", longopts, NULL)) != -1) {
switch (ch) {
//指定目标arch架构
case CD_OPT_ARCH: {
NSString *name = [NSString stringWithUTF8String:optarg];
targetArch = CDArchFromName(name);
if (targetArch.cputype != CPU_TYPE_ANY)
hasSpecifiedArch = YES;
else {
fprintf(stderr, "Error: Unknown arch %s\n\n", optarg);
errorFlag = YES;
}
break;
}
//列举出有哪些架构
case CD_OPT_LIST_ARCHES:
shouldListArches = YES;
break;
//打印class-dump版本
case CD_OPT_VERSION:
shouldPrintVersion = YES;
break;
//指定sdk版本
case CD_OPT_SDK_IOS: {
NSString *root = [NSString stringWithUTF8String:optarg];
//NSLog(@"root: %@", root);
NSString *str;
if ([[NSFileManager defaultManager] fileExistsAtPath: @"/Applications/Xcode.app"]) {
str = [NSString stringWithFormat:@"/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS%@.sdk", root];
} else if ([[NSFileManager defaultManager] fileExistsAtPath: @"/Developer"]) {
str = [NSString stringWithFormat:@"/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS%@.sdk", root];
}
classDump.sdkRoot = str;
break;
}
case CD_OPT_SDK_MAC: {
NSString *root = [NSString stringWithUTF8String:optarg];
//NSLog(@"root: %@", root);
NSString *str;
if ([[NSFileManager defaultManager] fileExistsAtPath: @"/Applications/Xcode.app"]) {
str = [NSString stringWithFormat:@"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX%@.sdk", root];
} else if ([[NSFileManager defaultManager] fileExistsAtPath: @"/Developer"]) {
str = [NSString stringWithFormat:@"/Developer/SDKs/MacOSX%@.sdk", root];
}
classDump.sdkRoot = str;
break;
}
case CD_OPT_SDK_ROOT: {
NSString *root = [NSString stringWithUTF8String:optarg];
//NSLog(@"root: %@", root);
classDump.sdkRoot = root;
break;
}
//隐藏section
case CD_OPT_HIDE: {
NSString *str = [NSString stringWithUTF8String:optarg];
if ([str isEqualToString:@"all"]) {
[hiddenSections addObject:@"structures"];
[hiddenSections addObject:@"protocols"];
} else {
[hiddenSections addObject:str];
}
break;
}
//显示变量偏移
case 'a':
classDump.shouldShowIvarOffsets = YES;
break;
//显示方法地址
case 'A':
classDump.shouldShowMethodAddresses = YES;
break;
//对类名正则匹配
case 'C': {
NSError *error;
NSRegularExpression *regularExpression = [NSRegularExpression regularExpressionWithPattern:[NSString stringWithUTF8String:optarg]
options:(NSRegularExpressionOptions)0
error:&error];
if (regularExpression != nil) {
classDump.regularExpression = regularExpression;
} else {
fprintf(stderr, "class-dump: Error with regular expression: %s\n\n", [[error localizedFailureReason] UTF8String]);
errorFlag = YES;
}
// Last one wins now.
break;
}
//在方法名中搜索字符串
case 'f': {
searchString = [NSString stringWithUTF8String:optarg];
break;
}
//是否生成头文件
case 'H':
shouldGenerateSeparateHeaders = YES;
break;
//根据继承关系排序
case 'I':
classDump.shouldSortClassesByInheritance = YES;
break;
//生成头文件的目标文件夹
case 'o':
outputPath = [NSString stringWithUTF8String:optarg];
break;
//递归处理framework和dylib
case 'r':
classDump.shouldProcessRecursively = YES;
break;
//排序类名
case 's':
classDump.shouldSortClasses = YES;
break;
//排序方法名
case 'S':
classDump.shouldSortMethods = YES;
break;
//打印头文件
case 't':
classDump.shouldShowHeader = NO;
break;
case '?':
default:
errorFlag = YES;
break;
}
}
if (errorFlag) {
print_usage();
exit(2);
}
if (shouldPrintVersion) {
printf("class-dump %s compiled %s\n", CLASS_DUMP_VERSION, __DATE__ " " __TIME__);
exit(0);
}
if (optind < argc) {
NSString *arg = [NSString stringWithFileSystemRepresentation:argv[optind]];
NSString *executablePath = [arg executablePathForFilename];
//打印所有架构
if (shouldListArches) {
if (executablePath == nil) {
printf("none\n");
} else {
CDSearchPathState *searchPathState = [[CDSearchPathState alloc] init];
searchPathState.executablePath = executablePath;
id macho = [CDFile fileWithContentsOfFile:executablePath searchPathState:searchPathState];
if (macho == nil) {
printf("none\n");
} else {
if ([macho isKindOfClass:[CDMachOFile class]]) {
printf("%s\n", [[macho archName] UTF8String]);
} else if ([macho isKindOfClass:[CDFatFile class]]) {
printf("%s\n", [[[macho archNames] componentsJoinedByString:@" "] UTF8String]);
}
}
}
} else {
if (executablePath == nil) {
fprintf(stderr, "class-dump: Input file (%s) doesn't contain an executable.\n", [arg fileSystemRepresentation]);
exit(1);
}
classDump.searchPathState.executablePath = [executablePath stringByDeletingLastPathComponent];
//解析Mach-O文件结构
CDFile *file = [CDFile fileWithContentsOfFile:executablePath searchPathState:classDump.searchPathState];
if (file == nil) {
NSFileManager *defaultManager = [NSFileManager defaultManager];
if ([defaultManager fileExistsAtPath:executablePath]) {
if ([defaultManager isReadableFileAtPath:executablePath]) {
fprintf(stderr, "class-dump: Input file (%s) is neither a Mach-O file nor a fat archive.\n", [executablePath UTF8String]);
} else {
fprintf(stderr, "class-dump: Input file (%s) is not readable (check read permissions).\n", [executablePath UTF8String]);
}
} else {
fprintf(stderr, "class-dump: Input file (%s) does not exist.\n", [executablePath UTF8String]);
}
exit(1);
}
if (hasSpecifiedArch == NO) {
//没有指定目标架构，配置最佳架构
if ([file bestMatchForLocalArch:&targetArch] == NO) {
fprintf(stderr, "Error: Couldn't get local architecture\n");
exit(1);
}
//NSLog(@"No arch specified, best match for local arch is: (%08x, %08x)", targetArch.cputype, targetArch.cpusubtype);
} else {
//NSLog(@"chosen arch is: (%08x, %08x)", targetArch.cputype, targetArch.cpusubtype);
}
classDump.targetArch = targetArch;
classDump.searchPathState.executablePath = [executablePath stringByDeletingLastPathComponent];
NSError *error;
//加载文件
if (![classDump loadFile:file error:&error]) {
fprintf(stderr, "Error: %s\n", [[error localizedFailureReason] UTF8String]);
exit(1);
} else {
//处理解析数据
[classDump processObjectiveCData];
//处理type
[classDump registerTypes];
if (searchString != nil) {
CDFindMethodVisitor *visitor = [[CDFindMethodVisitor alloc] init];
visitor.classDump = classDump;
visitor.searchString = searchString;
[classDump recursivelyVisit:visitor];
} else if (shouldGenerateSeparateHeaders) {
//生成头文件
CDMultiFileVisitor *multiFileVisitor = [[CDMultiFileVisitor alloc] init];
multiFileVisitor.classDump = classDump;
classDump.typeController.delegate = multiFileVisitor;
multiFileVisitor.outputPath = outputPath;
[classDump recursivelyVisit:multiFileVisitor];
} else {
CDClassDumpVisitor *visitor = [[CDClassDumpVisitor alloc] init];
visitor.classDump = classDump;
if ([hiddenSections containsObject:@"structures"]) visitor.shouldShowStructureSection = NO;
if ([hiddenSections containsObject:@"protocols"]) visitor.shouldShowProtocolSection = NO;
[classDump recursivelyVisit:visitor];
}
}
}
}
exit(0); // avoid costly autorelease pool drain, we’re exiting anyway
}
}