src/ImageLoaderMachOCompressed.h

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2008 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,
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  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 __IMAGELOADER_MACHO_COMPRESSED__
  27 #define __IMAGELOADER_MACHO_COMPRESSED__
  28
  29 #include <stdint.h>
  30
  31 #include "ImageLoaderMachO.h"
  32
  33
  34 //
  35 // ImageLoaderMachOCompressed is the concrete subclass of ImageLoader which loads mach-o files
  36 // that use the compressed LINKEDIT format.
  37 //
  38 class ImageLoaderMachOCompressed : public ImageLoaderMachO {
  39 public:
  40         static ImageLoaderMachOCompressed*      instantiateMainExecutable(const macho_header* mh, uintptr_t slide, const char* path,
  41                                                                                                                                         unsigned int segCount, unsigned int libCount, const LinkContext& context);
  42         static ImageLoaderMachOCompressed*      instantiateFromFile(const char* path, int fd, const uint8_t* fileData,
  43                                                                                                                         uint64_t offsetInFat, uint64_t lenInFat, const struct stat& info,
  44                                                                                                                         unsigned int segCount, unsigned int libCount, const LinkContext& context);
  45         static ImageLoaderMachOCompressed*      instantiateFromCache(const macho_header* mh, const char* path, const struct stat& info,
  46                                                                                                                                 unsigned int segCount, unsigned int libCount, const LinkContext& context);
  47         static ImageLoaderMachOCompressed*      instantiateFromMemory(const char* moduleName, const macho_header* mh, uint64_t len,
  48                                                                                                                         unsigned int segCount, unsigned int libCount, const LinkContext& context);
  49
  50
  51         virtual                                                         ~ImageLoaderMachOCompressed();
  52
  53         virtual ImageLoader*                            libImage(unsigned int) const;
  54         virtual bool                                            libReExported(unsigned int) const;
  55         virtual void                                            setLibImage(unsigned int, ImageLoader*, bool);
  56         virtual void                                            doBind(const LinkContext& context, bool forceLazysBound);
  57         virtual void                                            doBindJustLazies(const LinkContext& context);
  58         virtual uintptr_t                                       doBindLazySymbol(uintptr_t* lazyPointer, const LinkContext& context);
  59         virtual uintptr_t                                       doBindFastLazySymbol(uint32_t lazyBindingInfoOffset, const LinkContext& context);
  60         virtual const char*                                     findClosestSymbol(const void* addr, const void** closestAddr) const;
  61         virtual void                                            initializeCoalIterator(CoalIterator&, unsigned int loadOrder);
  62         virtual bool                                            incrementCoalIterator(CoalIterator&);
  63         virtual uintptr_t                                       getAddressCoalIterator(CoalIterator&, const LinkContext& contex);
  64         virtual void                                            updateUsesCoalIterator(CoalIterator&, uintptr_t newAddr, ImageLoader* target, const LinkContext& context);
  65
  66
  67 protected:
  68         virtual void                                            setDyldInfo(const dyld_info_command* dyldInfo) { fDyldInfo = dyldInfo; }
  69         virtual void                                            setSymbolTableInfo(const macho_nlist*, const char*, const dysymtab_command*) {}
  70         virtual bool                                            isSubframeworkOf(const LinkContext& context, const ImageLoader* image) const { return false; }
  71         virtual bool                                            hasSubLibrary(const LinkContext& context, const ImageLoader* child) const { return false; }
  72         virtual uint32_t*                                       segmentCommandOffsets() const;
  73         virtual void                                            rebase(const LinkContext& context);
  74         virtual const ImageLoader::Symbol*      findExportedSymbol(const char* name, const ImageLoader** foundIn) const;
  75         virtual bool                                            containsSymbol(const void* addr) const;
  76         virtual uintptr_t                                       exportedSymbolAddress(const Symbol* symbol) const;
  77         virtual bool                                            exportedSymbolIsWeakDefintion(const Symbol* symbol) const;
  78         virtual const char*                                     exportedSymbolName(const Symbol* symbol) const;
  79         virtual unsigned int                            exportedSymbolCount() const;
  80         virtual const ImageLoader::Symbol*      exportedSymbolIndexed(unsigned int) const;
  81         virtual unsigned int                            importedSymbolCount() const;
  82         virtual const ImageLoader::Symbol*      importedSymbolIndexed(unsigned int) const;
  83         virtual const char*                                     importedSymbolName(const Symbol* symbol) const;
  84 #if PREBOUND_IMAGE_SUPPORT
  85         virtual void                                            resetPreboundLazyPointers(const LinkContext& context);
  86 #endif
  87
  88
  89 private:
  90         struct LastLookup { int ordinal; uint8_t flags; const char* name; uintptr_t result; const ImageLoader* foundIn; };
  91
  92
  93         typedef uintptr_t (ImageLoaderMachOCompressed::*bind_handler)(const LinkContext& context, uintptr_t addr, uint8_t type,
  94                                                                                         const char* symbolName, uint8_t symboFlags, intptr_t addend, int libraryOrdinal,
  95                                                                                         const char* msg, LastLookup* last);
  96
  97         void                                                            eachLazyBind(const LinkContext& context, bind_handler);
  98         void                                                            eachBind(const LinkContext& context, bind_handler);
  99
 100
 101                                                                                 ImageLoaderMachOCompressed(const macho_header* mh, const char* path, unsigned int segCount,
 102                                                                                                                                         uint32_t segOffsets[], unsigned int libCount);
 103         static ImageLoaderMachOCompressed*      instantiateStart(const macho_header* mh, const char* path, unsigned int segCount, unsigned int libCount);
 104         void                                                            instantiateFinish(const LinkContext& context);
 105         void                                                            markSequentialLINKEDIT(const LinkContext& context);
 106         void                                                            markFreeLINKEDIT(const LinkContext& context);
 107         void                                                            markLINKEDIT(const LinkContext& context, int advise);
 108
 109         void                                                            rebaseAt(const LinkContext& context, uintptr_t addr, uintptr_t slide, uint8_t type);
 110         void                                                            throwBadRebaseAddress(uintptr_t address, uintptr_t segmentEndAddress, int segmentIndex,
 111                                                                                                 const uint8_t* startOpcodes, const uint8_t* endOpcodes, const uint8_t* pos);
 112         uintptr_t                                                       bindAt(const LinkContext& context, uintptr_t addr, uint8_t type, const char* symbolName,
 113                                                                                                 uint8_t symboFlags, intptr_t addend, int libraryOrdinal, const char* msg,
 114                                                                                                 LastLookup* last);
 115         void                                                            bindCompressed(const LinkContext& context);
 116         void                                                            throwBadBindingAddress(uintptr_t address, uintptr_t segmentEndAddress, int segmentIndex,
 117                                                                                                 const uint8_t* startOpcodes, const uint8_t* endOpcodes, const uint8_t* pos);
 118         uintptr_t                                                       resolve(const LinkContext& context, const char* symbolName,
 119                                                                                                 uint8_t symboFlags, int libraryOrdinal, const ImageLoader** targetImage, LastLookup* last = NULL);
 120         uintptr_t                                                       resolveFlat(const LinkContext& context, const char* symbolName, bool weak_import,
 121                                                                                                         const ImageLoader** foundIn);
 122         uintptr_t                                                       resolveCoalesced(const LinkContext& context, const char* symbolName, const ImageLoader** foundIn);
 123         uintptr_t                                                       resolveTwolevel(const LinkContext& context, const ImageLoader* targetImage, bool weak_import,
 124                                                                                                                 const char* symbolName, const ImageLoader** foundIn);
 125
 126         const struct dyld_info_command*                 fDyldInfo;
 127 };
 128
 129
 130
 131 #endif // __IMAGELOADER_MACHO_COMPRESSED__
 132
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