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--- dyld/dyld-360.19/src/ImageLoader.cpp
+++ /dev/null
@@ -1,1152 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2004-2010 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@
- */
-
-#define __STDC_LIMIT_MACROS
-#include <stdint.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <mach/mach.h>
-#include <mach-o/fat.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/mount.h>
-#include <libkern/OSAtomic.h>
-
-#include "ImageLoader.h"
-
-
-uint32_t ImageLoader::fgImagesUsedFromSharedCache = 0;
-uint32_t ImageLoader::fgImagesWithUsedPrebinding = 0;
-uint32_t ImageLoader::fgImagesRequiringCoalescing = 0;
-uint32_t ImageLoader::fgImagesHasWeakDefinitions = 0;
-uint32_t ImageLoader::fgTotalRebaseFixups = 0;
-uint32_t ImageLoader::fgTotalBindFixups = 0;
-uint32_t ImageLoader::fgTotalBindSymbolsResolved = 0;
-uint32_t ImageLoader::fgTotalBindImageSearches = 0;
-uint32_t ImageLoader::fgTotalLazyBindFixups = 0;
-uint32_t ImageLoader::fgTotalPossibleLazyBindFixups = 0;
-uint32_t ImageLoader::fgTotalSegmentsMapped = 0;
-uint64_t ImageLoader::fgTotalBytesMapped = 0;
-uint64_t ImageLoader::fgTotalBytesPreFetched = 0;
-uint64_t ImageLoader::fgTotalLoadLibrariesTime;
-uint64_t ImageLoader::fgTotalRebaseTime;
-uint64_t ImageLoader::fgTotalBindTime;
-uint64_t ImageLoader::fgTotalWeakBindTime;
-uint64_t ImageLoader::fgTotalDOF;
-uint64_t ImageLoader::fgTotalInitTime;
-uint16_t ImageLoader::fgLoadOrdinal = 0;
-std::vector<ImageLoader::InterposeTuple>ImageLoader::fgInterposingTuples;
-uintptr_t ImageLoader::fgNextPIEDylibAddress = 0;
-
-
-
-ImageLoader::ImageLoader(const char* path, unsigned int libCount)
- : fPath(path), fRealPath(NULL), fDevice(0), fInode(0), fLastModified(0),
- fPathHash(0), fDlopenReferenceCount(0), fInitializerRecursiveLock(NULL),
- fDepth(0), fLoadOrder(fgLoadOrdinal++), fState(0), fLibraryCount(libCount),
- fAllLibraryChecksumsAndLoadAddressesMatch(false), fLeaveMapped(false), fNeverUnload(false),
- fHideSymbols(false), fMatchByInstallName(false),
- fInterposed(false), fRegisteredDOF(false), fAllLazyPointersBound(false),
- fBeingRemoved(false), fAddFuncNotified(false),
- fPathOwnedByImage(false), fIsReferencedDownward(false),
- fWeakSymbolsBound(false)
-{
- if ( fPath != NULL )
- fPathHash = hash(fPath);
- if ( libCount > 512 )
- dyld::throwf("too many dependent dylibs in %s", path);
-}
-
-
-void ImageLoader::deleteImage(ImageLoader* image)
-{
- delete image;
-}
-
-
-ImageLoader::~ImageLoader()
-{
- if ( fRealPath != NULL )
- delete [] fRealPath;
- if ( fPathOwnedByImage && (fPath != NULL) )
- delete [] fPath;
-}
-
-void ImageLoader::setFileInfo(dev_t device, ino_t inode, time_t modDate)
-{
- fDevice = device;
- fInode = inode;
- fLastModified = modDate;
-}
-
-void ImageLoader::setMapped(const LinkContext& context)
-{
- fState = dyld_image_state_mapped;
- context.notifySingle(dyld_image_state_mapped, this); // note: can throw exception
-}
-
-int ImageLoader::compare(const ImageLoader* right) const
-{
- if ( this->fDepth == right->fDepth ) {
- if ( this->fLoadOrder == right->fLoadOrder )
- return 0;
- else if ( this->fLoadOrder < right->fLoadOrder )
- return -1;
- else
- return 1;
- }
- else {
- if ( this->fDepth < right->fDepth )
- return -1;
- else
- return 1;
- }
-}
-
-void ImageLoader::setPath(const char* path)
-{
- if ( fPathOwnedByImage && (fPath != NULL) )
- delete [] fPath;
- fPath = new char[strlen(path)+1];
- strcpy((char*)fPath, path);
- fPathOwnedByImage = true; // delete fPath when this image is destructed
- fPathHash = hash(fPath);
- fRealPath = NULL;
-}
-
-void ImageLoader::setPathUnowned(const char* path)
-{
- if ( fPathOwnedByImage && (fPath != NULL) ) {
- delete [] fPath;
- }
- fPath = path;
- fPathOwnedByImage = false;
- fPathHash = hash(fPath);
-}
-
-void ImageLoader::setPaths(const char* path, const char* realPath)
-{
- this->setPath(path);
- fRealPath = new char[strlen(realPath)+1];
- strcpy((char*)fRealPath, realPath);
-}
-
-const char* ImageLoader::getRealPath() const
-{
- if ( fRealPath != NULL )
- return fRealPath;
- else
- return fPath;
-}
-
-
-uint32_t ImageLoader::hash(const char* path)
-{
- // this does not need to be a great hash
- // it is just used to reduce the number of strcmp() calls
- // of existing images when loading a new image
- uint32_t h = 0;
- for (const char* s=path; *s != '\0'; ++s)
- h = h*5 + *s;
- return h;
-}
-
-bool ImageLoader::matchInstallPath() const
-{
- return fMatchByInstallName;
-}
-
-void ImageLoader::setMatchInstallPath(bool match)
-{
- fMatchByInstallName = match;
-}
-
-bool ImageLoader::statMatch(const struct stat& stat_buf) const
-{
- return ( (this->fDevice == stat_buf.st_dev) && (this->fInode == stat_buf.st_ino) );
-}
-
-const char* ImageLoader::getShortName() const
-{
- // try to return leaf name
- if ( fPath != NULL ) {
- const char* s = strrchr(fPath, '/');
- if ( s != NULL )
- return &s[1];
- }
- return fPath;
-}
-
-void ImageLoader::setLeaveMapped()
-{
- fLeaveMapped = true;
-}
-
-void ImageLoader::setHideExports(bool hide)
-{
- fHideSymbols = hide;
-}
-
-bool ImageLoader::hasHiddenExports() const
-{
- return fHideSymbols;
-}
-
-bool ImageLoader::isLinked() const
-{
- return (fState >= dyld_image_state_bound);
-}
-
-time_t ImageLoader::lastModified() const
-{
- return fLastModified;
-}
-
-bool ImageLoader::containsAddress(const void* addr) const
-{
- for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- const uint8_t* start = (const uint8_t*)segActualLoadAddress(i);
- const uint8_t* end = (const uint8_t*)segActualEndAddress(i);
- if ( (start <= addr) && (addr < end) && !segUnaccessible(i) )
- return true;
- }
- return false;
-}
-
-bool ImageLoader::overlapsWithAddressRange(const void* start, const void* end) const
-{
- for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- const uint8_t* segStart = (const uint8_t*)segActualLoadAddress(i);
- const uint8_t* segEnd = (const uint8_t*)segActualEndAddress(i);
- if ( strcmp(segName(i), "__UNIXSTACK") == 0 ) {
- // __UNIXSTACK never slides. This is the only place that cares
- // and checking for that segment name in segActualLoadAddress()
- // is too expensive.
- segStart -= getSlide();
- segEnd -= getSlide();
- }
- if ( (start <= segStart) && (segStart < end) )
- return true;
- if ( (start <= segEnd) && (segEnd < end) )
- return true;
- if ( (segStart < start) && (end < segEnd) )
- return true;
- }
- return false;
-}
-
-void ImageLoader::getMappedRegions(MappedRegion*& regions) const
-{
- for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
- MappedRegion region;
- region.address = segActualLoadAddress(i);
- region.size = segSize(i);
- *regions++ = region;
- }
-}
-
-
-
-bool ImageLoader::dependsOn(ImageLoader* image) {
- for(unsigned int i=0; i < libraryCount(); ++i) {
- if ( libImage(i) == image )
- return true;
- }
- return false;
-}
-
-
-static bool notInImgageList(const ImageLoader* image, const ImageLoader** dsiStart, const ImageLoader** dsiCur)
-{
- for (const ImageLoader** p = dsiStart; p < dsiCur; ++p)
- if ( *p == image )
- return false;
- return true;
-}
-
-
-// private method that handles circular dependencies by only search any image once
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImagesExcept(const char* name,
- const ImageLoader** dsiStart, const ImageLoader**& dsiCur, const ImageLoader** dsiEnd, const ImageLoader** foundIn) const
-{
- const ImageLoader::Symbol* sym;
- // search self
- if ( notInImgageList(this, dsiStart, dsiCur) ) {
- sym = this->findExportedSymbol(name, false, foundIn);
- if ( sym != NULL )
- return sym;
- *dsiCur++ = this;
- }
-
- // search directly dependent libraries
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( (dependentImage != NULL) && notInImgageList(dependentImage, dsiStart, dsiCur) ) {
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbol(name, false, foundIn);
- if ( sym != NULL )
- return sym;
- }
- }
-
- // search indirectly dependent libraries
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( (dependentImage != NULL) && notInImgageList(dependentImage, dsiStart, dsiCur) ) {
- *dsiCur++ = dependentImage;
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbolInDependentImagesExcept(name, dsiStart, dsiCur, dsiEnd, foundIn);
- if ( sym != NULL )
- return sym;
- }
- }
-
- return NULL;
-}
-
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const
-{
- unsigned int imageCount = context.imageCount();
- const ImageLoader* dontSearchImages[imageCount];
- dontSearchImages[0] = this; // don't search this image
- const ImageLoader** cur = &dontSearchImages[1];
- return this->findExportedSymbolInDependentImagesExcept(name, &dontSearchImages[0], cur, &dontSearchImages[imageCount], foundIn);
-}
-
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInImageOrDependentImages(const char* name, const LinkContext& context, const ImageLoader** foundIn) const
-{
- unsigned int imageCount = context.imageCount();
- const ImageLoader* dontSearchImages[imageCount];
- const ImageLoader** cur = &dontSearchImages[0];
- return this->findExportedSymbolInDependentImagesExcept(name, &dontSearchImages[0], cur, &dontSearchImages[imageCount], foundIn);
-}
-
-// this is called by initializeMainExecutable() to interpose on the initial set of images
-void ImageLoader::applyInterposing(const LinkContext& context)
-{
- if ( fgInterposingTuples.size() != 0 )
- this->recursiveApplyInterposing(context);
-}
-
-
-uintptr_t ImageLoader::interposedAddress(const LinkContext& context, uintptr_t address, const ImageLoader* inImage, const ImageLoader* onlyInImage)
-{
- //dyld::log("interposedAddress(0x%08llX), tupleCount=%lu\n", (uint64_t)address, fgInterposingTuples.size());
- for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
- //dyld::log(" interposedAddress: replacee=0x%08llX, replacement=0x%08llX, neverImage=%p, onlyImage=%p, inImage=%p\n",
- // (uint64_t)it->replacee, (uint64_t)it->replacement, it->neverImage, it->onlyImage, inImage);
- // replace all references to 'replacee' with 'replacement'
- if ( (address == it->replacee) && (inImage != it->neverImage) && ((it->onlyImage == NULL) || (inImage == it->onlyImage)) ) {
- if ( context.verboseInterposing ) {
- dyld::log("dyld interposing: replace 0x%lX with 0x%lX\n", it->replacee, it->replacement);
- }
- return it->replacement;
- }
- }
- return address;
-}
-
-void ImageLoader::addDynamicInterposingTuples(const struct dyld_interpose_tuple array[], size_t count)
-{
- for(size_t i=0; i < count; ++i) {
- ImageLoader::InterposeTuple tuple;
- tuple.replacement = (uintptr_t)array[i].replacement;
- tuple.neverImage = NULL;
- tuple.onlyImage = this;
- tuple.replacee = (uintptr_t)array[i].replacee;
- // chain to any existing interpositions
- for (std::vector<InterposeTuple>::iterator it=fgInterposingTuples.begin(); it != fgInterposingTuples.end(); it++) {
- if ( (it->replacee == tuple.replacee) && (it->onlyImage == this) ) {
- tuple.replacee = it->replacement;
- }
- }
- ImageLoader::fgInterposingTuples.push_back(tuple);
- }
-}
-
-
-void ImageLoader::link(const LinkContext& context, bool forceLazysBound, bool preflightOnly, bool neverUnload, const RPathChain& loaderRPaths)
-{
- //dyld::log("ImageLoader::link(%s) refCount=%d, neverUnload=%d\n", this->getPath(), fDlopenReferenceCount, fNeverUnload);
-
- // clear error strings
- (*context.setErrorStrings)(dyld_error_kind_none, NULL, NULL, NULL);
-
- uint64_t t0 = mach_absolute_time();
- this->recursiveLoadLibraries(context, preflightOnly, loaderRPaths);
- context.notifyBatch(dyld_image_state_dependents_mapped);
-
- // we only do the loading step for preflights
- if ( preflightOnly )
- return;
-
- uint64_t t1 = mach_absolute_time();
- context.clearAllDepths();
- this->recursiveUpdateDepth(context.imageCount());
-
- uint64_t t2 = mach_absolute_time();
- this->recursiveRebase(context);
- context.notifyBatch(dyld_image_state_rebased);
-
- uint64_t t3 = mach_absolute_time();
- this->recursiveBind(context, forceLazysBound, neverUnload);
-
- uint64_t t4 = mach_absolute_time();
- if ( !context.linkingMainExecutable )
- this->weakBind(context);
- uint64_t t5 = mach_absolute_time();
-
- context.notifyBatch(dyld_image_state_bound);
- uint64_t t6 = mach_absolute_time();
-
- std::vector<DOFInfo> dofs;
- this->recursiveGetDOFSections(context, dofs);
- context.registerDOFs(dofs);
- uint64_t t7 = mach_absolute_time();
-
- // interpose any dynamically loaded images
- if ( !context.linkingMainExecutable && (fgInterposingTuples.size() != 0) ) {
- this->recursiveApplyInterposing(context);
- }
-
- // clear error strings
- (*context.setErrorStrings)(dyld_error_kind_none, NULL, NULL, NULL);
-
- fgTotalLoadLibrariesTime += t1 - t0;
- fgTotalRebaseTime += t3 - t2;
- fgTotalBindTime += t4 - t3;
- fgTotalWeakBindTime += t5 - t4;
- fgTotalDOF += t7 - t6;
-
- // done with initial dylib loads
- fgNextPIEDylibAddress = 0;
-}
-
-
-void ImageLoader::printReferenceCounts()
-{
- dyld::log(" dlopen=%d for %s\n", fDlopenReferenceCount, getPath() );
-}
-
-
-bool ImageLoader::decrementDlopenReferenceCount()
-{
- if ( fDlopenReferenceCount == 0 )
- return true;
- --fDlopenReferenceCount;
- return false;
-}
-
-
-// <rdar://problem/14412057> upward dylib initializers can be run too soon
-// To handle dangling dylibs which are upward linked but not downward, all upward linked dylibs
-// have their initialization postponed until after the recursion through downward dylibs
-// has completed.
-void ImageLoader::processInitializers(const LinkContext& context, mach_port_t thisThread,
- InitializerTimingList& timingInfo, ImageLoader::UninitedUpwards& images)
-{
- uint32_t maxImageCount = context.imageCount();
- ImageLoader::UninitedUpwards upsBuffer[maxImageCount];
- ImageLoader::UninitedUpwards& ups = upsBuffer[0];
- ups.count = 0;
- // Calling recursive init on all images in images list, building a new list of
- // uninitialized upward dependencies.
- for (uintptr_t i=0; i < images.count; ++i) {
- images.images[i]->recursiveInitialization(context, thisThread, timingInfo, ups);
- }
- // If any upward dependencies remain, init them.
- if ( ups.count > 0 )
- processInitializers(context, thisThread, timingInfo, ups);
-}
-
-
-void ImageLoader::runInitializers(const LinkContext& context, InitializerTimingList& timingInfo)
-{
- uint64_t t1 = mach_absolute_time();
- mach_port_t thisThread = mach_thread_self();
- ImageLoader::UninitedUpwards up;
- up.count = 1;
- up.images[0] = this;
- processInitializers(context, thisThread, timingInfo, up);
- context.notifyBatch(dyld_image_state_initialized);
- mach_port_deallocate(mach_task_self(), thisThread);
- uint64_t t2 = mach_absolute_time();
- fgTotalInitTime += (t2 - t1);
-}
-
-
-void ImageLoader::bindAllLazyPointers(const LinkContext& context, bool recursive)
-{
- if ( ! fAllLazyPointersBound ) {
- fAllLazyPointersBound = true;
-
- if ( recursive ) {
- // bind lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->bindAllLazyPointers(context, recursive);
- }
- }
- // bind lazies in this image
- this->doBindJustLazies(context);
- }
-}
-
-
-bool ImageLoader::allDependentLibrariesAsWhenPreBound() const
-{
- return fAllLibraryChecksumsAndLoadAddressesMatch;
-}
-
-
-void ImageLoader::markedUsedRecursive(const std::vector<DynamicReference>& dynamicReferences)
-{
- // already visited here
- if ( fMarkedInUse )
- return;
- fMarkedInUse = true;
-
- // clear mark on all statically dependent dylibs
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL ) {
- dependentImage->markedUsedRecursive(dynamicReferences);
- }
- }
-
- // clear mark on all dynamically dependent dylibs
- for (std::vector<ImageLoader::DynamicReference>::const_iterator it=dynamicReferences.begin(); it != dynamicReferences.end(); ++it) {
- if ( it->from == this )
- it->to->markedUsedRecursive(dynamicReferences);
- }
-
-}
-
-unsigned int ImageLoader::recursiveUpdateDepth(unsigned int maxDepth)
-{
- // the purpose of this phase is to make the images sortable such that
- // in a sort list of images, every image that an image depends on
- // occurs in the list before it.
- if ( fDepth == 0 ) {
- // break cycles
- fDepth = maxDepth;
-
- // get depth of dependents
- unsigned int minDependentDepth = maxDepth;
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( (dependentImage != NULL) && !libIsUpward(i) ) {
- unsigned int d = dependentImage->recursiveUpdateDepth(maxDepth);
- if ( d < minDependentDepth )
- minDependentDepth = d;
- }
- }
-
- // make me less deep then all my dependents
- fDepth = minDependentDepth - 1;
- }
-
- return fDepth;
-}
-
-
-void ImageLoader::recursiveLoadLibraries(const LinkContext& context, bool preflightOnly, const RPathChain& loaderRPaths)
-{
- if ( fState < dyld_image_state_dependents_mapped ) {
- // break cycles
- fState = dyld_image_state_dependents_mapped;
-
- // get list of libraries this image needs
- DependentLibraryInfo libraryInfos[fLibraryCount];
- this->doGetDependentLibraries(libraryInfos);
-
- // get list of rpaths that this image adds
- std::vector<const char*> rpathsFromThisImage;
- this->getRPaths(context, rpathsFromThisImage);
- const RPathChain thisRPaths(&loaderRPaths, &rpathsFromThisImage);
-
- // try to load each
- bool canUsePrelinkingInfo = true;
- for(unsigned int i=0; i < fLibraryCount; ++i){
- ImageLoader* dependentLib;
- bool depLibReExported = false;
- bool depLibReRequired = false;
- bool depLibCheckSumsMatch = false;
- DependentLibraryInfo& requiredLibInfo = libraryInfos[i];
-#if DYLD_SHARED_CACHE_SUPPORT
- if ( preflightOnly && context.inSharedCache(requiredLibInfo.name) ) {
- // <rdar://problem/5910137> dlopen_preflight() on image in shared cache leaves it loaded but not objc initialized
- // in preflight mode, don't even load dylib that are in the shared cache because they will never be unloaded
- setLibImage(i, NULL, false, false);
- continue;
- }
-#endif
- try {
- dependentLib = context.loadLibrary(requiredLibInfo.name, true, this->getPath(), &thisRPaths);
- if ( dependentLib == this ) {
- // found circular reference, perhaps DYLD_LIBARY_PATH is causing this rdar://problem/3684168
- dependentLib = context.loadLibrary(requiredLibInfo.name, false, NULL, NULL);
- if ( dependentLib != this )
- dyld::warn("DYLD_ setting caused circular dependency in %s\n", this->getPath());
- }
- if ( fNeverUnload )
- dependentLib->setNeverUnload();
- if ( requiredLibInfo.upward ) {
- }
- else {
- dependentLib->fIsReferencedDownward = true;
- }
- LibraryInfo actualInfo = dependentLib->doGetLibraryInfo();
- depLibReRequired = requiredLibInfo.required;
- depLibCheckSumsMatch = ( actualInfo.checksum == requiredLibInfo.info.checksum );
- depLibReExported = requiredLibInfo.reExported;
- if ( ! depLibReExported ) {
- // for pre-10.5 binaries that did not use LC_REEXPORT_DYLIB
- depLibReExported = dependentLib->isSubframeworkOf(context, this) || this->hasSubLibrary(context, dependentLib);
- }
- // check found library version is compatible
- // <rdar://problem/89200806> 0xFFFFFFFF is wildcard that matches any version
- if ( (requiredLibInfo.info.minVersion != 0xFFFFFFFF) && (actualInfo.minVersion < requiredLibInfo.info.minVersion) ) {
- // record values for possible use by CrashReporter or Finder
- dyld::throwf("Incompatible library version: %s requires version %d.%d.%d or later, but %s provides version %d.%d.%d",
- this->getShortName(), requiredLibInfo.info.minVersion >> 16, (requiredLibInfo.info.minVersion >> 8) & 0xff, requiredLibInfo.info.minVersion & 0xff,
- dependentLib->getShortName(), actualInfo.minVersion >> 16, (actualInfo.minVersion >> 8) & 0xff, actualInfo.minVersion & 0xff);
- }
- // prebinding for this image disabled if any dependent library changed
- if ( !depLibCheckSumsMatch )
- canUsePrelinkingInfo = false;
- // prebinding for this image disabled unless both this and dependent are in the shared cache
- if ( !dependentLib->inSharedCache() || !this->inSharedCache() )
- canUsePrelinkingInfo = false;
-
- //if ( context.verbosePrebinding ) {
- // if ( !requiredLib.checksumMatches )
- // fprintf(stderr, "dyld: checksum mismatch, (%u v %u) for %s referencing %s\n",
- // requiredLibInfo.info.checksum, actualInfo.checksum, this->getPath(), dependentLib->getPath());
- // if ( dependentLib->getSlide() != 0 )
- // fprintf(stderr, "dyld: dependent library slid for %s referencing %s\n", this->getPath(), dependentLib->getPath());
- //}
- }
- catch (const char* msg) {
- //if ( context.verbosePrebinding )
- // fprintf(stderr, "dyld: exception during processing for %s referencing %s\n", this->getPath(), dependentLib->getPath());
- if ( requiredLibInfo.required ) {
- fState = dyld_image_state_mapped;
- // record values for possible use by CrashReporter or Finder
- if ( strstr(msg, "Incompatible") != NULL )
- (*context.setErrorStrings)(dyld_error_kind_dylib_version, this->getPath(), requiredLibInfo.name, NULL);
- else if ( strstr(msg, "architecture") != NULL )
- (*context.setErrorStrings)(dyld_error_kind_dylib_wrong_arch, this->getPath(), requiredLibInfo.name, NULL);
- else
- (*context.setErrorStrings)(dyld_error_kind_dylib_missing, this->getPath(), requiredLibInfo.name, NULL);
- const char* newMsg = dyld::mkstringf("Library not loaded: %s\n Referenced from: %s\n Reason: %s", requiredLibInfo.name, this->getRealPath(), msg);
- free((void*)msg); // our free() will do nothing if msg is a string literal
- throw newMsg;
- }
- free((void*)msg); // our free() will do nothing if msg is a string literal
- // ok if weak library not found
- dependentLib = NULL;
- canUsePrelinkingInfo = false; // this disables all prebinding, we may want to just slam import vectors for this lib to zero
- }
- setLibImage(i, dependentLib, depLibReExported, requiredLibInfo.upward);
- }
- fAllLibraryChecksumsAndLoadAddressesMatch = canUsePrelinkingInfo;
-
- // tell each to load its dependents
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL ) {
- dependentImage->recursiveLoadLibraries(context, preflightOnly, thisRPaths);
- }
- }
-
- // do deep prebind check
- if ( fAllLibraryChecksumsAndLoadAddressesMatch ) {
- for(unsigned int i=0; i < libraryCount(); ++i){
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL ) {
- if ( !dependentImage->allDependentLibrariesAsWhenPreBound() )
- fAllLibraryChecksumsAndLoadAddressesMatch = false;
- }
- }
- }
-
- // free rpaths (getRPaths() malloc'ed each string)
- for(std::vector<const char*>::iterator it=rpathsFromThisImage.begin(); it != rpathsFromThisImage.end(); ++it) {
- const char* str = *it;
- free((void*)str);
- }
-
- }
-}
-
-void ImageLoader::recursiveRebase(const LinkContext& context)
-{
- if ( fState < dyld_image_state_rebased ) {
- // break cycles
- fState = dyld_image_state_rebased;
-
- try {
- // rebase lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->recursiveRebase(context);
- }
-
- // rebase this image
- doRebase(context);
-
- // notify
- context.notifySingle(dyld_image_state_rebased, this);
- }
- catch (const char* msg) {
- // this image is not rebased
- fState = dyld_image_state_dependents_mapped;
- CRSetCrashLogMessage2(NULL);
- throw;
- }
- }
-}
-
-void ImageLoader::recursiveApplyInterposing(const LinkContext& context)
-{
- if ( ! fInterposed ) {
- // break cycles
- fInterposed = true;
-
- try {
- // interpose lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->recursiveApplyInterposing(context);
- }
-
- // interpose this image
- doInterpose(context);
- }
- catch (const char* msg) {
- // this image is not interposed
- fInterposed = false;
- throw;
- }
- }
-}
-
-
-
-void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound, bool neverUnload)
-{
- // Normally just non-lazy pointers are bound immediately.
- // The exceptions are:
- // 1) DYLD_BIND_AT_LAUNCH will cause lazy pointers to be bound immediately
- // 2) some API's (e.g. RTLD_NOW) can cause lazy pointers to be bound immediately
- if ( fState < dyld_image_state_bound ) {
- // break cycles
- fState = dyld_image_state_bound;
-
- try {
- // bind lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->recursiveBind(context, forceLazysBound, neverUnload);
- }
- // bind this image
- this->doBind(context, forceLazysBound);
- // mark if lazys are also bound
- if ( forceLazysBound || this->usablePrebinding(context) )
- fAllLazyPointersBound = true;
- // mark as never-unload if requested
- if ( neverUnload )
- this->setNeverUnload();
-
- context.notifySingle(dyld_image_state_bound, this);
- }
- catch (const char* msg) {
- // restore state
- fState = dyld_image_state_rebased;
- CRSetCrashLogMessage2(NULL);
- throw;
- }
- }
-}
-
-void ImageLoader::weakBind(const LinkContext& context)
-{
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak bind start:\n");
- uint64_t t1 = mach_absolute_time();
- // get set of ImageLoaders that participate in coalecsing
- ImageLoader* imagesNeedingCoalescing[fgImagesRequiringCoalescing];
- int count = context.getCoalescedImages(imagesNeedingCoalescing);
-
- // count how many have not already had weakbinding done
- int countNotYetWeakBound = 0;
- int countOfImagesWithWeakDefinitions = 0;
- int countOfImagesWithWeakDefinitionsNotInSharedCache = 0;
- for(int i=0; i < count; ++i) {
- if ( ! imagesNeedingCoalescing[i]->fWeakSymbolsBound )
- ++countNotYetWeakBound;
- if ( imagesNeedingCoalescing[i]->hasCoalescedExports() ) {
- ++countOfImagesWithWeakDefinitions;
- if ( ! imagesNeedingCoalescing[i]->inSharedCache() )
- ++countOfImagesWithWeakDefinitionsNotInSharedCache;
- }
- }
-
- // don't need to do any coalescing if only one image has overrides, or all have already been done
- if ( (countOfImagesWithWeakDefinitionsNotInSharedCache > 0) && (countNotYetWeakBound > 0) ) {
- // make symbol iterators for each
- ImageLoader::CoalIterator iterators[count];
- ImageLoader::CoalIterator* sortedIts[count];
- for(int i=0; i < count; ++i) {
- imagesNeedingCoalescing[i]->initializeCoalIterator(iterators[i], i);
- sortedIts[i] = &iterators[i];
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak bind load order %d/%d for %s\n", i, count, imagesNeedingCoalescing[i]->getPath());
- }
-
- // walk all symbols keeping iterators in sync by
- // only ever incrementing the iterator with the lowest symbol
- int doneCount = 0;
- while ( doneCount != count ) {
- //for(int i=0; i < count; ++i)
- // dyld::log("sym[%d]=%s ", sortedIts[i]->loadOrder, sortedIts[i]->symbolName);
- //dyld::log("\n");
- // increment iterator with lowest symbol
- if ( sortedIts[0]->image->incrementCoalIterator(*sortedIts[0]) )
- ++doneCount;
- // re-sort iterators
- for(int i=1; i < count; ++i) {
- int result = strcmp(sortedIts[i-1]->symbolName, sortedIts[i]->symbolName);
- if ( result == 0 )
- sortedIts[i-1]->symbolMatches = true;
- if ( result > 0 ) {
- // new one is bigger then next, so swap
- ImageLoader::CoalIterator* temp = sortedIts[i-1];
- sortedIts[i-1] = sortedIts[i];
- sortedIts[i] = temp;
- }
- if ( result < 0 )
- break;
- }
- // process all matching symbols just before incrementing the lowest one that matches
- if ( sortedIts[0]->symbolMatches && !sortedIts[0]->done ) {
- const char* nameToCoalesce = sortedIts[0]->symbolName;
- // pick first symbol in load order (and non-weak overrides weak)
- uintptr_t targetAddr = 0;
- ImageLoader* targetImage = NULL;
- for(int i=0; i < count; ++i) {
- if ( strcmp(iterators[i].symbolName, nameToCoalesce) == 0 ) {
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak bind, found %s weak=%d in %s \n", nameToCoalesce, iterators[i].weakSymbol, iterators[i].image->getPath());
- if ( iterators[i].weakSymbol ) {
- if ( targetAddr == 0 ) {
- targetAddr = iterators[i].image->getAddressCoalIterator(iterators[i], context);
- if ( targetAddr != 0 )
- targetImage = iterators[i].image;
- }
- }
- else {
- targetAddr = iterators[i].image->getAddressCoalIterator(iterators[i], context);
- if ( targetAddr != 0 ) {
- targetImage = iterators[i].image;
- // strong implementation found, stop searching
- break;
- }
- }
- }
- }
- // tell each to bind to this symbol (unless already bound)
- if ( targetAddr != 0 ) {
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak binding all uses of %s to copy from %s\n", nameToCoalesce, targetImage->getShortName());
- for(int i=0; i < count; ++i) {
- if ( strcmp(iterators[i].symbolName, nameToCoalesce) == 0 ) {
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak bind, setting all uses of %s in %s to 0x%lX from %s\n", nameToCoalesce, iterators[i].image->getShortName(), targetAddr, targetImage->getShortName());
- if ( ! iterators[i].image->fWeakSymbolsBound )
- iterators[i].image->updateUsesCoalIterator(iterators[i], targetAddr, targetImage, context);
- iterators[i].symbolMatches = false;
- }
- }
- }
-
- }
- }
-
- // mark all as having all weak symbols bound
- for(int i=0; i < count; ++i) {
- imagesNeedingCoalescing[i]->fWeakSymbolsBound = true;
- }
- }
- uint64_t t2 = mach_absolute_time();
- fgTotalWeakBindTime += t2 - t1;
-
- if ( context.verboseWeakBind )
- dyld::log("dyld: weak bind end\n");
-}
-
-
-
-void ImageLoader::recursiveGetDOFSections(const LinkContext& context, std::vector<DOFInfo>& dofs)
-{
- if ( ! fRegisteredDOF ) {
- // break cycles
- fRegisteredDOF = true;
-
- // gather lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->recursiveGetDOFSections(context, dofs);
- }
- this->doGetDOFSections(context, dofs);
- }
-}
-
-void ImageLoader::setNeverUnloadRecursive() {
- if ( ! fNeverUnload ) {
- // break cycles
- fNeverUnload = true;
-
- // gather lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL )
- dependentImage->setNeverUnloadRecursive();
- }
- }
-}
-
-void ImageLoader::recursiveSpinLock(recursive_lock& rlock)
-{
- // try to set image's ivar fInitializerRecursiveLock to point to this lock_info
- // keep trying until success (spin)
- while ( ! OSAtomicCompareAndSwapPtrBarrier(NULL, &rlock, (void**)&fInitializerRecursiveLock) ) {
- // if fInitializerRecursiveLock already points to a different lock_info, if it is for
- // the same thread we are on, the increment the lock count, otherwise continue to spin
- if ( (fInitializerRecursiveLock != NULL) && (fInitializerRecursiveLock->thread == rlock.thread) )
- break;
- }
- ++(fInitializerRecursiveLock->count);
-}
-
-void ImageLoader::recursiveSpinUnLock()
-{
- if ( --(fInitializerRecursiveLock->count) == 0 )
- fInitializerRecursiveLock = NULL;
-}
-
-
-void ImageLoader::recursiveInitialization(const LinkContext& context, mach_port_t this_thread,
- InitializerTimingList& timingInfo, UninitedUpwards& uninitUps)
-{
- recursive_lock lock_info(this_thread);
- recursiveSpinLock(lock_info);
-
- if ( fState < dyld_image_state_dependents_initialized-1 ) {
- uint8_t oldState = fState;
- // break cycles
- fState = dyld_image_state_dependents_initialized-1;
- try {
- // initialize lower level libraries first
- for(unsigned int i=0; i < libraryCount(); ++i) {
- ImageLoader* dependentImage = libImage(i);
- if ( dependentImage != NULL ) {
- // don't try to initialize stuff "above" me yet
- if ( libIsUpward(i) ) {
- uninitUps.images[uninitUps.count] = dependentImage;
- uninitUps.count++;
- }
- else if ( dependentImage->fDepth >= fDepth ) {
- dependentImage->recursiveInitialization(context, this_thread, timingInfo, uninitUps);
- }
- }
- }
-
- // record termination order
- if ( this->needsTermination() )
- context.terminationRecorder(this);
-
- // let objc know we are about to initialize this image
- uint64_t t1 = mach_absolute_time();
- fState = dyld_image_state_dependents_initialized;
- oldState = fState;
- context.notifySingle(dyld_image_state_dependents_initialized, this);
-
- // initialize this image
- bool hasInitializers = this->doInitialization(context);
-
- // let anyone know we finished initializing this image
- fState = dyld_image_state_initialized;
- oldState = fState;
- context.notifySingle(dyld_image_state_initialized, this);
-
- if ( hasInitializers ) {
- uint64_t t2 = mach_absolute_time();
- timingInfo.images[timingInfo.count].image = this;
- timingInfo.images[timingInfo.count].initTime = (t2-t1);
- timingInfo.count++;
- }
- }
- catch (const char* msg) {
- // this image is not initialized
- fState = oldState;
- recursiveSpinUnLock();
- throw;
- }
- }
-
- recursiveSpinUnLock();
-}
-
-
-static void printTime(const char* msg, uint64_t partTime, uint64_t totalTime)
-{
- static uint64_t sUnitsPerSecond = 0;
- if ( sUnitsPerSecond == 0 ) {
- struct mach_timebase_info timeBaseInfo;
- if ( mach_timebase_info(&timeBaseInfo) == KERN_SUCCESS ) {
- sUnitsPerSecond = 1000000000ULL * timeBaseInfo.denom / timeBaseInfo.numer;
- }
- }
- if ( partTime < sUnitsPerSecond ) {
- uint32_t milliSecondsTimesHundred = (uint32_t)((partTime*100000)/sUnitsPerSecond);
- uint32_t milliSeconds = (uint32_t)(milliSecondsTimesHundred/100);
- uint32_t percentTimesTen = (uint32_t)((partTime*1000)/totalTime);
- uint32_t percent = percentTimesTen/10;
- dyld::log("%s: %u.%02u milliseconds (%u.%u%%)\n", msg, milliSeconds, milliSecondsTimesHundred-milliSeconds*100, percent, percentTimesTen-percent*10);
- }
- else {
- uint32_t secondsTimeTen = (uint32_t)((partTime*10)/sUnitsPerSecond);
- uint32_t seconds = secondsTimeTen/10;
- uint32_t percentTimesTen = (uint32_t)((partTime*1000)/totalTime);
- uint32_t percent = percentTimesTen/10;
- dyld::log("%s: %u.%u seconds (%u.%u%%)\n", msg, seconds, secondsTimeTen-seconds*10, percent, percentTimesTen-percent*10);
- }
-}
-
-static char* commatize(uint64_t in, char* out)
-{
- uint64_t div10 = in / 10;
- uint8_t delta = in - div10*10;
- char* s = &out[32];
- int digitCount = 1;
- *s = '\0';
- *(--s) = '0' + delta;
- in = div10;
- while ( in != 0 ) {
- if ( (digitCount % 3) == 0 )
- *(--s) = ',';
- div10 = in / 10;
- delta = in - div10*10;
- *(--s) = '0' + delta;
- in = div10;
- ++digitCount;
- }
- return s;
-}
-
-
-void ImageLoader::printStatistics(unsigned int imageCount, const InitializerTimingList& timingInfo)
-{
- uint64_t totalTime = fgTotalLoadLibrariesTime + fgTotalRebaseTime + fgTotalBindTime + fgTotalWeakBindTime + fgTotalDOF + fgTotalInitTime;
- char commaNum1[40];
- char commaNum2[40];
-
- printTime("total time", totalTime, totalTime);
-#if __IPHONE_OS_VERSION_MIN_REQUIRED
- if ( fgImagesUsedFromSharedCache != 0 )
- dyld::log("total images loaded: %d (%u from dyld shared cache)\n", imageCount, fgImagesUsedFromSharedCache);
- else
- dyld::log("total images loaded: %d\n", imageCount);
-#else
- dyld::log("total images loaded: %d (%u from dyld shared cache)\n", imageCount, fgImagesUsedFromSharedCache);
-#endif
- dyld::log("total segments mapped: %u, into %llu pages with %llu pages pre-fetched\n", fgTotalSegmentsMapped, fgTotalBytesMapped/4096, fgTotalBytesPreFetched/4096);
- printTime("total images loading time", fgTotalLoadLibrariesTime, totalTime);
- printTime("total dtrace DOF registration time", fgTotalDOF, totalTime);
- dyld::log("total rebase fixups: %s\n", commatize(fgTotalRebaseFixups, commaNum1));
- printTime("total rebase fixups time", fgTotalRebaseTime, totalTime);
- dyld::log("total binding fixups: %s\n", commatize(fgTotalBindFixups, commaNum1));
- if ( fgTotalBindSymbolsResolved != 0 ) {
- uint32_t avgTimesTen = (fgTotalBindImageSearches * 10) / fgTotalBindSymbolsResolved;
- uint32_t avgInt = fgTotalBindImageSearches / fgTotalBindSymbolsResolved;
- uint32_t avgTenths = avgTimesTen - (avgInt*10);
- dyld::log("total binding symbol lookups: %s, average images searched per symbol: %u.%u\n",
- commatize(fgTotalBindSymbolsResolved, commaNum1), avgInt, avgTenths);
- }
- printTime("total binding fixups time", fgTotalBindTime, totalTime);
- printTime("total weak binding fixups time", fgTotalWeakBindTime, totalTime);
- dyld::log("total bindings lazily fixed up: %s of %s\n", commatize(fgTotalLazyBindFixups, commaNum1), commatize(fgTotalPossibleLazyBindFixups, commaNum2));
- printTime("total initializer time", fgTotalInitTime, totalTime);
- for (uintptr_t i=0; i < timingInfo.count; ++i) {
- dyld::log("%21s ", timingInfo.images[i].image->getShortName());
- printTime("", timingInfo.images[i].initTime, totalTime);
- }
-
-}
-
-
-//
-// copy path and add suffix to result
-//
-// /path/foo.dylib _debug => /path/foo_debug.dylib
-// foo.dylib _debug => foo_debug.dylib
-// foo _debug => foo_debug
-// /path/bar _debug => /path/bar_debug
-// /path/bar.A.dylib _debug => /path/bar.A_debug.dylib
-//
-void ImageLoader::addSuffix(const char* path, const char* suffix, char* result)
-{
- strcpy(result, path);
-
- char* start = strrchr(result, '/');
- if ( start != NULL )
- start++;
- else
- start = result;
-
- char* dot = strrchr(start, '.');
- if ( dot != NULL ) {
- strcpy(dot, suffix);
- strcat(&dot[strlen(suffix)], &path[dot-result]);
- }
- else {
- strcat(result, suffix);
- }
-}
-
-
-VECTOR_NEVER_DESTRUCTED_IMPL(ImageLoader::InterposeTuple);
-VECTOR_NEVER_DESTRUCTED_IMPL(ImagePair);
-
-
-