src/ImageLoaderMachO.h

/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
 *
 * Copyright (c) 2004-2009 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */


#ifndef __IMAGELOADERMACHO__
#define __IMAGELOADERMACHO__

#include <stdint.h>
#include <mach-o/loader.h>
#include <mach-o/nlist.h>

#include "ImageLoader.h"
#include "mach-o/dyld_images.h"


//
// ImageLoaderMachO is a subclass of ImageLoader which loads mach-o format files.
//
//
class ImageLoaderMachO : public ImageLoader {
public:
	static ImageLoader*					instantiateMainExecutable(const macho_header* mh, uintptr_t slide, const char* path, const LinkContext& context);
	static ImageLoader*					instantiateFromFile(const char* path, int fd, const uint8_t firstPages[4096], uint64_t offsetInFat,
															uint64_t lenInFat, const struct stat& info, const LinkContext& context);
	static ImageLoader*					instantiateFromCache(const macho_header* mh, const char* path, long slide, const struct stat& info, const LinkContext& context);
	static ImageLoader*					instantiateFromMemory(const char* moduleName, const macho_header* mh, uint64_t len, const LinkContext& context);


	bool								inSharedCache() const { return fInSharedCache; }
	void								disableCoverageCheck() { fCoveredCodeLength = UINT64_MAX; }

	const char*							getInstallPath() const;
	virtual void*						getMain() const;
	virtual void*						getThreadPC() const;
	virtual const struct mach_header*   machHeader() const;
	virtual uintptr_t					getSlide() const;
	virtual const void*					getEnd() const;
	virtual bool						hasCoalescedExports() const;
	virtual const Symbol*				findExportedSymbol(const char* name, bool searchReExports, const ImageLoader** foundIn) const;
	virtual uintptr_t					getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
																const ImageLoader* requestor, bool runResolver) const;
	virtual DefinitionFlags				getExportedSymbolInfo(const Symbol* sym) const;
	virtual const char*					getExportedSymbolName(const Symbol* sym) const;
	virtual uint32_t					getExportedSymbolCount() const;
	virtual const Symbol*				getIndexedExportedSymbol(uint32_t index) const;
	virtual uint32_t					getImportedSymbolCount() const;
	virtual const Symbol*				getIndexedImportedSymbol(uint32_t index) const;
	virtual ReferenceFlags				getImportedSymbolInfo(const Symbol* sym) const;
	virtual const char*					getImportedSymbolName(const Symbol* sym) const;
	virtual bool						isBundle() const;
	virtual bool						isDylib() const;
	virtual bool						isExecutable() const;
	virtual bool						isPositionIndependentExecutable() const;
	virtual bool						forceFlat() const;
	virtual bool						participatesInCoalescing() const;
	virtual const char*					findClosestSymbol(const void* addr, const void** closestAddr) const = 0;
	virtual	void						initializeCoalIterator(CoalIterator&, unsigned int loadOrder) = 0;
	virtual	bool						incrementCoalIterator(CoalIterator&) = 0;
	virtual	uintptr_t					getAddressCoalIterator(CoalIterator&, const LinkContext& contex) = 0;
	virtual	void						updateUsesCoalIterator(CoalIterator&, uintptr_t newAddr, ImageLoader* target, const LinkContext& context) = 0;
	virtual uintptr_t					doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context) = 0;
	virtual uintptr_t					doBindFastLazySymbol(uint32_t lazyBindingInfoOffset, const LinkContext& context, void (*lock)(), void (*unlock)()) = 0;
	virtual void						doTermination(const LinkContext& context);
	virtual bool						needsInitialization();
	virtual bool						getSectionContent(const char* segmentName, const char* sectionName, void** start, size_t* length);
	virtual void						getUnwindInfo(dyld_unwind_sections* info);
	virtual bool						findSection(const void* imageInterior, const char** segmentName, const char** sectionName, size_t* sectionOffset);
	virtual bool						usablePrebinding(const LinkContext& context) const;
	virtual unsigned int				segmentCount() const;
	virtual const char*					segName(unsigned int) const;
	virtual uintptr_t					segSize(unsigned int) const;
	virtual uintptr_t					segFileSize(unsigned int) const;
	virtual bool						segHasTrailingZeroFill(unsigned int);
	virtual uintptr_t					segFileOffset(unsigned int) const;
	virtual bool						segReadable(unsigned int) const;
	virtual bool						segWriteable(unsigned int) const;
	virtual bool						segExecutable(unsigned int) const;
	virtual bool						segUnaccessible(unsigned int) const;
	virtual bool						segHasPreferredLoadAddress(unsigned int) const;
	virtual uintptr_t					segActualLoadAddress(unsigned int) const;
	virtual uintptr_t					segPreferredLoadAddress(unsigned int) const;
	virtual uintptr_t					segActualEndAddress(unsigned int) const;
	virtual void						registerInterposing();
	virtual uint32_t					sdkVersion() const;
	virtual uint32_t					minOSVersion() const;


	static void							printStatistics(unsigned int imageCount, const InitializerTimingList&);
	static  uint32_t					minOSVersion(const mach_header*);

protected:
						ImageLoaderMachO(const ImageLoaderMachO&);
						ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
																	uint32_t segOffsets[], unsigned int libCount);
	virtual				~ImageLoaderMachO() {}

	void				operator=(const ImageLoaderMachO&);

	virtual void						setDyldInfo(const struct dyld_info_command*) = 0;
	virtual void						setSymbolTableInfo(const macho_nlist*, const char*, const dysymtab_command*) = 0;
	virtual	bool						isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const = 0;
	virtual	bool						hasSubLibrary(const LinkContext& context, const ImageLoader* child) const = 0;
	virtual uint32_t*					segmentCommandOffsets() const = 0;
	virtual	void						rebase(const LinkContext& context) = 0;
	virtual const ImageLoader::Symbol*	findExportedSymbol(const char* name, const ImageLoader** foundIn) const = 0;
	virtual bool						containsSymbol(const void* addr) const = 0;
	virtual uintptr_t					exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const = 0;
	virtual bool						exportedSymbolIsWeakDefintion(const Symbol* symbol) const = 0;
	virtual const char*					exportedSymbolName(const Symbol* symbol) const = 0;
	virtual unsigned int				exportedSymbolCount() const = 0;
	virtual const ImageLoader::Symbol*	exportedSymbolIndexed(unsigned int) const = 0;
	virtual unsigned int				importedSymbolCount() const = 0;
	virtual const ImageLoader::Symbol*	importedSymbolIndexed(unsigned int) const = 0;
	virtual const char*					importedSymbolName(const Symbol* symbol) const = 0;
#if PREBOUND_IMAGE_SUPPORT
	virtual void						resetPreboundLazyPointers(const LinkContext& context) = 0;
#endif


	virtual void		doGetDependentLibraries(DependentLibraryInfo libs[]);
	virtual LibraryInfo doGetLibraryInfo();
	virtual	void		getRPaths(const LinkContext& context, std::vector<const char*>&) const;
	virtual	bool		getUUID(uuid_t) const;
	virtual void		doRebase(const LinkContext& context);
	virtual void		doBind(const LinkContext& context, bool forceLazysBound) = 0;
	virtual void		doBindJustLazies(const LinkContext& context) = 0;
	virtual bool		doInitialization(const LinkContext& context);
	virtual void		doGetDOFSections(const LinkContext& context, std::vector<ImageLoader::DOFInfo>& dofs);
	virtual bool		needsTermination();
	virtual bool		segmentsMustSlideTogether() const;
	virtual bool		segmentsCanSlide() const;
	virtual void		setSlide(intptr_t slide);
	virtual bool		usesTwoLevelNameSpace() const;
	virtual bool		isPrebindable() const;


protected:

			void		destroy();
	static void			sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
											unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
											const linkedit_data_command** codeSigCmd,
											const encryption_info_command** encryptCmd);
	static bool			needsAddedLibSystemDepency(unsigned int libCount, const macho_header* mh);
			void		loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context);
			void		validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context);
			const struct macho_segment_command* segLoadCommand(unsigned int segIndex) const;
			void		parseLoadCmds(const ImageLoader::LinkContext& context);
			int 		crashIfInvalidCodeSignature();
			bool		segHasRebaseFixUps(unsigned int) const;
			bool		segHasBindFixUps(unsigned int) const;
			void		segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context);
			void		segMakeWritable(unsigned int segIndex, const ImageLoader::LinkContext& context);
#if __i386__
			bool		segIsReadOnlyImport(unsigned int) const;
#endif
			intptr_t	assignSegmentAddresses(const LinkContext& context);
			uintptr_t	reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context);
			bool		reserveAddressRange(uintptr_t start, size_t length);
			void		mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context);
			void		mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context);
			void		UnmapSegments();
			void		__attribute__((noreturn)) throwSymbolNotFound(const LinkContext& context, const char* symbol,
																	const char* referencedFrom, const char* fromVersMismatch,
																	const char* expectedIn);
			void		doImageInit(const LinkContext& context);
			void		doModInitFunctions(const LinkContext& context);
			void		setupLazyPointerHandler(const LinkContext& context);
			void		lookupProgramVars(const LinkContext& context) const;
			uintptr_t	bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
										const ImageLoader* targetImage, uint8_t type, const char* symbolName,
										intptr_t addend, const char* msg);

			void		makeTextSegmentWritable(const LinkContext& context, bool writeable);
			void		preFetchDATA(int fd, uint64_t offsetInFat, const LinkContext& context);


			void		doInterpose(const LinkContext& context) = 0;
			bool		hasReferencesToWeakSymbols() const;
			uintptr_t	getSymbolAddress(const Symbol* sym, const ImageLoader* requestor,
										const LinkContext& context, bool runResolver) const;

	static uintptr_t			bindLazySymbol(const mach_header*, uintptr_t* lazyPointer);
protected:
	uint64_t								fCoveredCodeLength;
	const uint8_t*							fMachOData;
	const uint8_t*							fLinkEditBase; // add any internal "offset" to this to get mapped address
	uintptr_t								fSlide;
	uint32_t								fEHFrameSectionOffset;
	uint32_t								fUnwindInfoSectionOffset;
	uint32_t								fDylibIDOffset;
	uint32_t								fSegmentsCount : 8,
											fIsSplitSeg : 1,
											fInSharedCache : 1,
#if TEXT_RELOC_SUPPORT
											fTextSegmentRebases : 1,
											fTextSegmentBinds : 1,
#endif
#if __i386__
											fReadOnlyImportSegment : 1,
#endif
											fHasSubLibraries : 1,
											fHasSubUmbrella : 1,
											fInUmbrella : 1,
											fHasDOFSections : 1,
											fHasDashInit : 1,
											fHasInitializers : 1,
											fHasTerminators : 1,
											fRegisteredAsRequiresCoalescing : 1; 	// <rdar://problem/7886402> Loading MH_DYLIB_STUB causing coalescable miscount


	static uint32_t					fgSymbolTableBinarySearchs;
	static uint32_t					fgSymbolTrieSearchs;
};


#endif // __IMAGELOADERMACHO__
Commit	Line	Data
	1	/* -- mode: C++; c-basic-offset: 4; tab-width: 4 --
	2	*
	3	* Copyright (c) 2004-2009 Apple Inc. All rights reserved.
	4	*
	5	* @APPLE_LICENSE_HEADER_START@
	6	*
	7	* This file contains Original Code and/or Modifications of Original Code
	8	* as defined in and that are subject to the Apple Public Source License
	9	* Version 2.0 (the 'License'). You may not use this file except in
	10	* compliance with the License. Please obtain a copy of the License at
	11	* http://www.opensource.apple.com/apsl/ and read it before using this
	12	* file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	19	* Please see the License for the specific language governing rights and
	20	* limitations under the License.
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24
	25
	26	#ifndef __IMAGELOADERMACHO__
	27	#define __IMAGELOADERMACHO__
	28
	29	#include <stdint.h>
	30	#include <mach-o/loader.h>
	31	#include <mach-o/nlist.h>
	32
	33	#include "ImageLoader.h"
	34	#include "mach-o/dyld_images.h"
	35
	36
	37	//
	38	// ImageLoaderMachO is a subclass of ImageLoader which loads mach-o format files.
	39	//
	40	//
	41	class ImageLoaderMachO : public ImageLoader {
	42	public:
	43	static ImageLoader* instantiateMainExecutable(const macho_header* mh, uintptr_t slide, const char* path, const LinkContext& context);
	44	static ImageLoader* instantiateFromFile(const char* path, int fd, const uint8_t firstPages[4096], uint64_t offsetInFat,
	45	uint64_t lenInFat, const struct stat& info, const LinkContext& context);
	46	static ImageLoader* instantiateFromCache(const macho_header* mh, const char* path, long slide, const struct stat& info, const LinkContext& context);
	47	static ImageLoader* instantiateFromMemory(const char* moduleName, const macho_header* mh, uint64_t len, const LinkContext& context);
	48
	49
	50	bool inSharedCache() const { return fInSharedCache; }
	51	void disableCoverageCheck() { fCoveredCodeLength = UINT64_MAX; }
	52
	53	const char* getInstallPath() const;
	54	virtual void* getMain() const;
	55	virtual void* getThreadPC() const;
	56	virtual const struct mach_header* machHeader() const;
	57	virtual uintptr_t getSlide() const;
	58	virtual const void* getEnd() const;
	59	virtual bool hasCoalescedExports() const;
	60	virtual const Symbol* findExportedSymbol(const char* name, bool searchReExports, const ImageLoader** foundIn) const;
	61	virtual uintptr_t getExportedSymbolAddress(const Symbol* sym, const LinkContext& context,
	62	const ImageLoader* requestor, bool runResolver) const;
	63	virtual DefinitionFlags getExportedSymbolInfo(const Symbol* sym) const;
	64	virtual const char* getExportedSymbolName(const Symbol* sym) const;
	65	virtual uint32_t getExportedSymbolCount() const;
	66	virtual const Symbol* getIndexedExportedSymbol(uint32_t index) const;
	67	virtual uint32_t getImportedSymbolCount() const;
	68	virtual const Symbol* getIndexedImportedSymbol(uint32_t index) const;
	69	virtual ReferenceFlags getImportedSymbolInfo(const Symbol* sym) const;
	70	virtual const char* getImportedSymbolName(const Symbol* sym) const;
	71	virtual bool isBundle() const;
	72	virtual bool isDylib() const;
	73	virtual bool isExecutable() const;
	74	virtual bool isPositionIndependentExecutable() const;
	75	virtual bool forceFlat() const;
	76	virtual bool participatesInCoalescing() const;
	77	virtual const char* findClosestSymbol(const void* addr, const void** closestAddr) const = 0;
	78	virtual void initializeCoalIterator(CoalIterator&, unsigned int loadOrder) = 0;
	79	virtual bool incrementCoalIterator(CoalIterator&) = 0;
	80	virtual uintptr_t getAddressCoalIterator(CoalIterator&, const LinkContext& contex) = 0;
	81	virtual void updateUsesCoalIterator(CoalIterator&, uintptr_t newAddr, ImageLoader* target, const LinkContext& context) = 0;
	82	virtual uintptr_t doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context) = 0;
	83	virtual uintptr_t doBindFastLazySymbol(uint32_t lazyBindingInfoOffset, const LinkContext& context, void (lock)(), void (unlock)()) = 0;
	84	virtual void doTermination(const LinkContext& context);
	85	virtual bool needsInitialization();
	86	virtual bool getSectionContent(const char* segmentName, const char* sectionName, void** start, size_t* length);
	87	virtual void getUnwindInfo(dyld_unwind_sections* info);
	88	virtual bool findSection(const void* imageInterior, const char segmentName, const char sectionName, size_t* sectionOffset);
	89	virtual bool usablePrebinding(const LinkContext& context) const;
	90	virtual unsigned int segmentCount() const;
	91	virtual const char* segName(unsigned int) const;
	92	virtual uintptr_t segSize(unsigned int) const;
	93	virtual uintptr_t segFileSize(unsigned int) const;
	94	virtual bool segHasTrailingZeroFill(unsigned int);
	95	virtual uintptr_t segFileOffset(unsigned int) const;
	96	virtual bool segReadable(unsigned int) const;
	97	virtual bool segWriteable(unsigned int) const;
	98	virtual bool segExecutable(unsigned int) const;
	99	virtual bool segUnaccessible(unsigned int) const;
	100	virtual bool segHasPreferredLoadAddress(unsigned int) const;
	101	virtual uintptr_t segActualLoadAddress(unsigned int) const;
	102	virtual uintptr_t segPreferredLoadAddress(unsigned int) const;
	103	virtual uintptr_t segActualEndAddress(unsigned int) const;
	104	virtual void registerInterposing();
	105	virtual uint32_t sdkVersion() const;
	106	virtual uint32_t minOSVersion() const;
	107
	108
	109	static void printStatistics(unsigned int imageCount, const InitializerTimingList&);
	110	static uint32_t minOSVersion(const mach_header*);
	111
	112	protected:
	113	ImageLoaderMachO(const ImageLoaderMachO&);
	114	ImageLoaderMachO(const macho_header* mh, const char* path, unsigned int segCount,
	115	uint32_t segOffsets[], unsigned int libCount);
	116	virtual ~ImageLoaderMachO() {}
	117
	118	void operator=(const ImageLoaderMachO&);
	119
	120	virtual void setDyldInfo(const struct dyld_info_command*) = 0;
	121	virtual void setSymbolTableInfo(const macho_nlist, const char, const dysymtab_command*) = 0;
	122	virtual bool isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const = 0;
	123	virtual bool hasSubLibrary(const LinkContext& context, const ImageLoader* child) const = 0;
	124	virtual uint32_t* segmentCommandOffsets() const = 0;
	125	virtual void rebase(const LinkContext& context) = 0;
	126	virtual const ImageLoader::Symbol* findExportedSymbol(const char* name, const ImageLoader** foundIn) const = 0;
	127	virtual bool containsSymbol(const void* addr) const = 0;
	128	virtual uintptr_t exportedSymbolAddress(const LinkContext& context, const Symbol* symbol, const ImageLoader* requestor, bool runResolver) const = 0;
	129	virtual bool exportedSymbolIsWeakDefintion(const Symbol* symbol) const = 0;
	130	virtual const char* exportedSymbolName(const Symbol* symbol) const = 0;
	131	virtual unsigned int exportedSymbolCount() const = 0;
	132	virtual const ImageLoader::Symbol* exportedSymbolIndexed(unsigned int) const = 0;
	133	virtual unsigned int importedSymbolCount() const = 0;
	134	virtual const ImageLoader::Symbol* importedSymbolIndexed(unsigned int) const = 0;
	135	virtual const char* importedSymbolName(const Symbol* symbol) const = 0;
	136	#if PREBOUND_IMAGE_SUPPORT
	137	virtual void resetPreboundLazyPointers(const LinkContext& context) = 0;
	138	#endif
	139
	140
	141	virtual void doGetDependentLibraries(DependentLibraryInfo libs[]);
	142	virtual LibraryInfo doGetLibraryInfo();
	143	virtual void getRPaths(const LinkContext& context, std::vector<const char*>&) const;
	144	virtual bool getUUID(uuid_t) const;
	145	virtual void doRebase(const LinkContext& context);
	146	virtual void doBind(const LinkContext& context, bool forceLazysBound) = 0;
	147	virtual void doBindJustLazies(const LinkContext& context) = 0;
	148	virtual bool doInitialization(const LinkContext& context);
	149	virtual void doGetDOFSections(const LinkContext& context, std::vector<ImageLoader::DOFInfo>& dofs);
	150	virtual bool needsTermination();
	151	virtual bool segmentsMustSlideTogether() const;
	152	virtual bool segmentsCanSlide() const;
	153	virtual void setSlide(intptr_t slide);
	154	virtual bool usesTwoLevelNameSpace() const;
	155	virtual bool isPrebindable() const;
	156
	157
	158	protected:
	159
	160	void destroy();
	161	static void sniffLoadCommands(const macho_header* mh, const char* path, bool inCache, bool* compressed,
	162	unsigned int* segCount, unsigned int* libCount, const LinkContext& context,
	163	const linkedit_data_command** codeSigCmd,
	164	const encryption_info_command** encryptCmd);
	165	static bool needsAddedLibSystemDepency(unsigned int libCount, const macho_header* mh);
	166	void loadCodeSignature(const struct linkedit_data_command* codeSigCmd, int fd, uint64_t offsetInFatFile, const LinkContext& context);
	167	void validateFirstPages(const struct linkedit_data_command* codeSigCmd, int fd, const uint8_t *fileData, size_t lenFileData, off_t offsetInFat, const LinkContext& context);
	168	const struct macho_segment_command* segLoadCommand(unsigned int segIndex) const;
	169	void parseLoadCmds(const ImageLoader::LinkContext& context);
	170	int crashIfInvalidCodeSignature();
	171	bool segHasRebaseFixUps(unsigned int) const;
	172	bool segHasBindFixUps(unsigned int) const;
	173	void segProtect(unsigned int segIndex, const ImageLoader::LinkContext& context);
	174	void segMakeWritable(unsigned int segIndex, const ImageLoader::LinkContext& context);
	175	#if __i386__
	176	bool segIsReadOnlyImport(unsigned int) const;
	177	#endif
	178	intptr_t assignSegmentAddresses(const LinkContext& context);
	179	uintptr_t reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context);
	180	bool reserveAddressRange(uintptr_t start, size_t length);
	181	void mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context);
	182	void mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context);
	183	void UnmapSegments();
	184	void __attribute__((noreturn)) throwSymbolNotFound(const LinkContext& context, const char* symbol,
	185	const char* referencedFrom, const char* fromVersMismatch,
	186	const char* expectedIn);
	187	void doImageInit(const LinkContext& context);
	188	void doModInitFunctions(const LinkContext& context);
	189	void setupLazyPointerHandler(const LinkContext& context);
	190	void lookupProgramVars(const LinkContext& context) const;
	191	uintptr_t bindLocation(const LinkContext& context, uintptr_t location, uintptr_t value,
	192	const ImageLoader* targetImage, uint8_t type, const char* symbolName,
	193	intptr_t addend, const char* msg);
	194
	195	void makeTextSegmentWritable(const LinkContext& context, bool writeable);
	196	void preFetchDATA(int fd, uint64_t offsetInFat, const LinkContext& context);
	197
	198
	199	void doInterpose(const LinkContext& context) = 0;
	200	bool hasReferencesToWeakSymbols() const;
	201	uintptr_t getSymbolAddress(const Symbol* sym, const ImageLoader* requestor,
	202	const LinkContext& context, bool runResolver) const;
	203
	204	static uintptr_t bindLazySymbol(const mach_header, uintptr_t lazyPointer);
	205	protected:
	206	uint64_t fCoveredCodeLength;
	207	const uint8_t* fMachOData;
	208	const uint8_t* fLinkEditBase; // add any internal "offset" to this to get mapped address
	209	uintptr_t fSlide;
	210	uint32_t fEHFrameSectionOffset;
	211	uint32_t fUnwindInfoSectionOffset;
	212	uint32_t fDylibIDOffset;
	213	uint32_t fSegmentsCount : 8,
	214	fIsSplitSeg : 1,
	215	fInSharedCache : 1,
	216	#if TEXT_RELOC_SUPPORT
	217	fTextSegmentRebases : 1,
	218	fTextSegmentBinds : 1,
	219	#endif
	220	#if __i386__
	221	fReadOnlyImportSegment : 1,
	222	#endif
	223	fHasSubLibraries : 1,
	224	fHasSubUmbrella : 1,
	225	fInUmbrella : 1,
	226	fHasDOFSections : 1,
	227	fHasDashInit : 1,
	228	fHasInitializers : 1,
	229	fHasTerminators : 1,
	230	fRegisteredAsRequiresCoalescing : 1; // <rdar://problem/7886402> Loading MH_DYLIB_STUB causing coalescable miscount
	231
	232
	233	static uint32_t fgSymbolTableBinarySearchs;
	234	static uint32_t fgSymbolTrieSearchs;
	235	};
	236
	237
	238	#endif // __IMAGELOADERMACHO__
	239
	240
	241
	242