/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
- * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2004-2010 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#define __STDC_LIMIT_MACROS
#include <stdint.h>
+#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <mach/mach.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::fgTotalNotifyTime;
+uint64_t ImageLoader::fgTotalWeakBindTime;
+uint64_t ImageLoader::fgTotalDOF;
uint64_t ImageLoader::fgTotalInitTime;
-uintptr_t ImageLoader::fgNextSplitSegAddress = 0x90000000;
-uintptr_t Segment::fgNextNonSplitSegAddress = 0x8FE00000;
+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;
+}
-__attribute__((noreturn))
-void throwf(const char* format, ...)
+ImageLoader::~ImageLoader()
{
- va_list list;
- char* p;
- va_start(list, format);
- vasprintf(&p, format, list);
- va_end(list);
-
- const char* t = p;
- throw t;
+ if ( fRealPath != NULL )
+ delete [] fRealPath;
+ if ( fPathOwnedByImage && (fPath != NULL) )
+ delete [] fPath;
}
-void ImageLoader::init(const char* path, uint64_t offsetInFat, dev_t device, ino_t inode, time_t modDate)
+void ImageLoader::setFileInfo(dev_t device, ino_t inode, time_t modDate)
{
- fPathHash = 0;
- fPath = NULL;
- if ( path != NULL )
- this->setPath(path);
- fLogicalPath = NULL;
fDevice = device;
fInode = inode;
fLastModified = modDate;
- fOffsetInFatFile = offsetInFat;
- //fSegments = NULL;
- fLibraries = NULL;
- fLibrariesCount = 0;
- fReferenceCount = 0;
- fAllLibraryChecksumsAndLoadAddressesMatch = false;
- fLeaveMapped = false;
- fHideSymbols = false;
- fMatchByInstallName = false;
- fLibrariesLoaded = false;
- fBased = false;
- fBoundAllNonLazy = false;
- fBoundAllLazy = false;
- fAnnounced = false;
- fInitialized = false;
- fNextAddImageIndex = 0;
}
-
-ImageLoader::ImageLoader(const char* path, uint64_t offsetInFat, const struct stat& info)
+void ImageLoader::setMapped(const LinkContext& context)
{
- init(path, offsetInFat, info.st_dev, info.st_ino, info.st_mtime);
+ fState = dyld_image_state_mapped;
+ context.notifySingle(dyld_image_state_mapped, this); // note: can throw exception
}
-ImageLoader::ImageLoader(const char* moduleName)
+int ImageLoader::compare(const ImageLoader* right) const
{
- init(moduleName, 0, 0, 0, 0);
-}
-
-
-ImageLoader::~ImageLoader()
-{
- // need to read up on STL and see if this is right way to destruct vector contents
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- delete seg;
+ 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;
}
- if ( fPath != NULL )
- delete [] fPath;
- if ( fLogicalPath != NULL )
- delete [] fLogicalPath;
}
-
void ImageLoader::setPath(const char* path)
{
- if ( fPath != NULL ) {
- // if duplicate path, do nothing
- if ( strcmp(path, fPath) == 0 )
- return;
+ 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::setLogicalPath(const char* path)
+void ImageLoader::setPathUnowned(const char* path)
{
- if ( fPath == NULL ) {
- // no physical path set yet, so use this path as physical
- this->setPath(path);
- }
- else if ( strcmp(path, fPath) == 0 ) {
- // do not set logical path because it is the same as the physical path
- fLogicalPath = NULL;
- }
- else {
- fLogicalPath = new char[strlen(path)+1];
- strcpy((char*)fLogicalPath, path);
+ if ( fPathOwnedByImage && (fPath != NULL) ) {
+ delete [] fPath;
}
+ fPath = path;
+ fPathOwnedByImage = false;
+ fPathHash = hash(fPath);
}
-const char* ImageLoader::getLogicalPath() const
+void ImageLoader::setPaths(const char* path, const char* realPath)
{
- if ( fLogicalPath != NULL )
- return fLogicalPath;
+ 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;
+ return fPath;
}
+
uint32_t ImageLoader::hash(const char* path)
{
// this does not need to be a great hash
return fPath;
}
-uint64_t ImageLoader::getOffsetInFatFile() const
-{
- return fOffsetInFatFile;
-}
-
void ImageLoader::setLeaveMapped()
{
fLeaveMapped = true;
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- fSegments[i]->setUnMapWhenDestructed(false);
- }
}
void ImageLoader::setHideExports(bool hide)
bool ImageLoader::isLinked() const
{
- return fBoundAllNonLazy;
+ return (fState >= dyld_image_state_bound);
}
-time_t ImageLoader::lastModified()
+time_t ImageLoader::lastModified() const
{
return fLastModified;
}
bool ImageLoader::containsAddress(const void* addr) const
{
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- const uint8_t* start = (const uint8_t*)seg->getActualLoadAddress();
- const uint8_t* end = start + seg->getSize();
- if ( (start <= addr) && (addr < end) && !seg->unaccessible() )
+ 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::addMappedRegions(RegionsVector& regions) const
+void ImageLoader::getMappedRegions(MappedRegion*& regions) const
{
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
+ for(unsigned int i=0, e=segmentCount(); i < e; ++i) {
MappedRegion region;
- region.address = seg->getActualLoadAddress();
- region.size = seg->getSize();
- regions.push_back(region);
+ region.address = segActualLoadAddress(i);
+ region.size = segSize(i);
+ *regions++ = region;
}
}
-void ImageLoader::incrementReferenceCount()
-{
- ++fReferenceCount;
+
+bool ImageLoader::dependsOn(ImageLoader* image) {
+ for(unsigned int i=0; i < libraryCount(); ++i) {
+ if ( libImage(i) == image )
+ return true;
+ }
+ return false;
}
-bool ImageLoader::decrementReferenceCount()
+
+static bool notInImgageList(const ImageLoader* image, const ImageLoader** dsiStart, const ImageLoader** dsiCur)
{
- return ( --fReferenceCount == 0 );
+ 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, std::set<const ImageLoader*>& dontSearchImages, ImageLoader** foundIn) const
+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 ( dontSearchImages.count(this) == 0 ) {
- sym = this->findExportedSymbol(name, NULL, false, foundIn);
+ if ( notInImgageList(this, dsiStart, dsiCur) ) {
+ sym = this->findExportedSymbol(name, false, foundIn);
if ( sym != NULL )
return sym;
- dontSearchImages.insert(this);
+ *dsiCur++ = this;
}
// search directly dependent libraries
- for (uint32_t i=0; i < fLibrariesCount; ++i) {
- ImageLoader* dependentImage = fLibraries[i].image;
- if ( (dependentImage != NULL) && (dontSearchImages.count(dependentImage) == 0) ) {
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbol(name, NULL, false, foundIn);
+ 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 (uint32_t i=0; i < fLibrariesCount; ++i) {
- ImageLoader* dependentImage = fLibraries[i].image;
- if ( (dependentImage != NULL) && (dontSearchImages.count(dependentImage) == 0) ) {
- const ImageLoader::Symbol* sym = dependentImage->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
+ 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;
- dontSearchImages.insert(dependentImage);
}
}
}
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInDependentImages(const char* name, ImageLoader** foundIn) const
+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
{
- std::set<const ImageLoader*> dontSearchImages;
- dontSearchImages.insert(this); // don't search this image
- return this->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
+ unsigned int imageCount = context.imageCount();
+ const ImageLoader* dontSearchImages[imageCount];
+ const ImageLoader** cur = &dontSearchImages[0];
+ return this->findExportedSymbolInDependentImagesExcept(name, &dontSearchImages[0], cur, &dontSearchImages[imageCount], foundIn);
}
-const ImageLoader::Symbol* ImageLoader::findExportedSymbolInImageOrDependentImages(const char* name, ImageLoader** foundIn) const
+// this is called by initializeMainExecutable() to interpose on the initial set of images
+void ImageLoader::applyInterposing(const LinkContext& context)
{
- std::set<const ImageLoader*> dontSearchImages;
- return this->findExportedSymbolInDependentImagesExcept(name, dontSearchImages, foundIn);
+ if ( fgInterposingTuples.size() != 0 )
+ this->recursiveApplyInterposing(context);
}
-void ImageLoader::link(const LinkContext& context, BindingLaziness bindness, InitializerRunning inits, uint32_t notifyCount)
+uintptr_t ImageLoader::interposedAddress(const LinkContext& context, uintptr_t address, const ImageLoader* inImage, const ImageLoader* onlyInImage)
{
- uint64_t t1 = mach_absolute_time();
- this->recursiveLoadLibraries(context);
+ //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, bindness);
-
- uint64_t t4 = mach_absolute_time();
- this->recursiveImageNotification(context, notifyCount);
-
- if ( (inits == kRunInitializers) || (inits == kDontRunInitializersButTellObjc) ) {
- std::vector<ImageLoader*> newImages;
- this->recursiveImageAnnouncement(context, newImages); // build bottom up list images being added
- context.notifyAdding(newImages); // tell gdb or anyone who cares about these
+ 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);
}
- uint64_t t5 = mach_absolute_time();
- if ( inits == kRunInitializers ) {
- this->recursiveInitialization(context);
- uint64_t t6 = mach_absolute_time();
- fgTotalInitTime += t6 - t5;
- }
- fgTotalLoadLibrariesTime += t2 - t1;
+ // clear error strings
+ (*context.setErrorStrings)(dyld_error_kind_none, NULL, NULL, NULL);
+
+ fgTotalLoadLibrariesTime += t1 - t0;
fgTotalRebaseTime += t3 - t2;
fgTotalBindTime += t4 - t3;
- fgTotalNotifyTime += t5 - t4;
+ fgTotalWeakBindTime += t5 - t4;
+ fgTotalDOF += t7 - t6;
+
+ // done with initial dylib loads
+ fgNextPIEDylibAddress = 0;
}
-// only called pre-main on main executable
-// if crt.c is ever cleaned up, this could go away
-void ImageLoader::runInitializers(const LinkContext& context)
+void ImageLoader::printReferenceCounts()
{
- std::vector<ImageLoader*> newImages;
- this->recursiveImageAnnouncement(context, newImages); // build bottom up list images being added
- context.notifyAdding(newImages); // tell gdb or anyone who cares about these
+ dyld::log(" dlopen=%d for %s\n", fDlopenReferenceCount, getPath() );
+}
+
- this->recursiveInitialization(context);
+bool ImageLoader::decrementDlopenReferenceCount()
+{
+ if ( fDlopenReferenceCount == 0 )
+ return true;
+ --fDlopenReferenceCount;
+ return false;
}
-// called inside _dyld_register_func_for_add_image()
-void ImageLoader::runNotification(const LinkContext& context, uint32_t notifyCount)
+
+// <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)
{
- this->recursiveImageNotification(context, notifyCount);
+ 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);
}
-intptr_t ImageLoader::assignSegmentAddresses(const LinkContext& context)
+void ImageLoader::runInitializers(const LinkContext& context, InitializerTimingList& timingInfo)
{
- // preflight and calculate slide if needed
- const unsigned int segmentCount = fSegments.size();
- intptr_t slide = 0;
- if ( this->segmentsCanSlide() && this->segmentsMustSlideTogether() ) {
- bool needsToSlide = false;
- uintptr_t lowAddr = UINTPTR_MAX;
- uintptr_t highAddr = 0;
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- const uintptr_t segLow = seg->getPreferredLoadAddress();
- const uintptr_t segHigh = segLow + seg->getSize();
- if ( segLow < lowAddr )
- lowAddr = segLow;
- if ( segHigh > highAddr )
- highAddr = segHigh;
-
- if ( context.slideAndPackDylibs || !seg->hasPreferredLoadAddress() || !Segment::reserveAddressRange(seg->getPreferredLoadAddress(), seg->getSize()) )
- needsToSlide = true;
- }
- if ( needsToSlide ) {
- // find a chunk of address space to hold all segments
- uintptr_t addr = Segment::reserveAnAddressRange(highAddr-lowAddr, context);
- slide = addr - lowAddr;
- }
- }
- else if ( ! this->segmentsCanSlide() ) {
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- if ( strcmp(seg->getName(), "__PAGEZERO") == 0 )
- continue;
- if ( !Segment::reserveAddressRange(seg->getPreferredLoadAddress(), seg->getSize()) )
- throw "can't map";
+ 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);
}
- else {
- // mach-o does not support independently sliding segments
- }
- return slide;
}
-void ImageLoader::mapSegments(int fd, uint64_t offsetInFat, uint64_t lenInFat, uint64_t fileLen, const LinkContext& context)
+bool ImageLoader::allDependentLibrariesAsWhenPreBound() const
{
- if ( context.verboseMapping )
- fprintf(stderr, "dyld: Mapping %s\n", this->getPath());
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->map(fd, offsetInFat, slide, context);
- }
- // update slide to reflect load location
- this->setSlide(slide);
-
- // now that it is mapped and slide is set, mark that we should unmap it when done
- for(unsigned int i=0; i < segmentCount; ++i){
- fSegments[i]->setUnMapWhenDestructed(true);
- }
+ return fAllLibraryChecksumsAndLoadAddressesMatch;
}
-void ImageLoader::mapSegments(const void* memoryImage, uint64_t imageLen, const LinkContext& context)
+
+void ImageLoader::markedUsedRecursive(const std::vector<DynamicReference>& dynamicReferences)
{
- if ( context.verboseMapping )
- fprintf(stderr, "dyld: Mapping memory %p\n", memoryImage);
- // find address range for image
- intptr_t slide = this->assignSegmentAddresses(context);
- // map in all segments
- const unsigned int segmentCount = fSegments.size();
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->map(memoryImage, slide, context);
+ // 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);
+ }
}
- // update slide to reflect load location
- this->setSlide(slide);
- // set R/W permissions on all segments at slide location
- for(unsigned int i=0; i < segmentCount; ++i){
- Segment* seg = fSegments[i];
- seg->setPermissions();
+
+ // 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);
}
+
}
-bool ImageLoader::allDependentLibrariesAsWhenPreBound() const
+unsigned int ImageLoader::recursiveUpdateDepth(unsigned int maxDepth)
{
- return fAllLibraryChecksumsAndLoadAddressesMatch;
+ // 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)
+void ImageLoader::recursiveLoadLibraries(const LinkContext& context, bool preflightOnly, const RPathChain& loaderRPaths)
{
- if ( ! fLibrariesLoaded ) {
+ if ( fState < dyld_image_state_dependents_mapped ) {
// break cycles
- fLibrariesLoaded = true;
+ fState = dyld_image_state_dependents_mapped;
// get list of libraries this image needs
- fLibrariesCount = this->doGetDependentLibraryCount();
- fLibraries = new DependentLibrary[fLibrariesCount];
- this->doGetDependentLibraries(fLibraries);
+ 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 < fLibrariesCount; ++i){
- DependentLibrary& requiredLib = fLibraries[i];
+ 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 {
- requiredLib.image = context.loadLibrary(requiredLib.name, true, this->getPath(), NULL);
- if ( requiredLib.image == this ) {
+ 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
- requiredLib.image = context.loadLibrary(requiredLib.name, false, NULL, NULL);
- if ( requiredLib.image != this )
- fprintf(stderr, "dyld: warning DYLD_ setting caused circular dependency in %s\n", this->getPath());
+ 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);
}
- LibraryInfo actualInfo = requiredLib.image->doGetLibraryInfo();
- requiredLib.checksumMatches = ( actualInfo.checksum == requiredLib.info.checksum );
// check found library version is compatible
- if ( actualInfo.minVersion < requiredLib.info.minVersion ) {
- throwf("Incompatible library version: %s requires version %d.%d.%d or later, but %s provides version %d.%d.%d",
- this->getShortName(), requiredLib.info.minVersion >> 16, (requiredLib.info.minVersion >> 8) & 0xff, requiredLib.info.minVersion & 0xff,
- requiredLib.image->getShortName(), actualInfo.minVersion >> 16, (actualInfo.minVersion >> 8) & 0xff, actualInfo.minVersion & 0xff);
+ // <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 or slid
- if ( !requiredLib.checksumMatches || (requiredLib.image->getSlide() != 0) )
+ // 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, (%lld v %lld) for %s referencing %s\n", requiredLib.info.checksum, actualInfo.checksum, this->getPath(), requiredLib.image->getPath());
- // if ( requiredLib.image->getSlide() != 0 )
- // fprintf(stderr, "dyld: dependent library slid for %s referencing %s\n", this->getPath(), requiredLib.image->getPath());
+ // 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(), requiredLib.image->getPath());
- if ( requiredLib.required ) {
- const char* formatString = "Library not loaded: %s\n Referenced from: %s\n Reason: %s";
- const char* referencedFrom = this->getPath();
- char buf[strlen(requiredLib.name)+strlen(referencedFrom)+strlen(formatString)+strlen(msg)+2];
- sprintf(buf, formatString, requiredLib.name, referencedFrom, msg);
- throw strdup(buf); // this is a leak if exception doesn't halt program
+ // 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
- requiredLib.image = NULL;
+ 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 < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL ) {
- libInfo.isSubFramework = libInfo.image->isSubframeworkOf(context, this);
- libInfo.isReExported = libInfo.isSubFramework || this->hasSubLibrary(context, libInfo.image);
- //if ( libInfo.isReExported )
- // fprintf(stderr, "%s re-exports %s\n", strrchr(this->getPath(), '/'), strrchr(libInfo.image->getPath(),'/'));
- libInfo.image->recursiveLoadLibraries(context);
+ 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 < fLibrariesCount; ++i){
- const DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL ) {
- if ( !libInfo.image->allDependentLibrariesAsWhenPreBound() )
+ 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 ( ! fBased ) {
+ if ( fState < dyld_image_state_rebased ) {
// break cycles
- fBased = true;
+ fState = dyld_image_state_rebased;
try {
// rebase lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveRebase(context);
+ 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
- fBased = false;
- throw msg;
+ 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, BindingLaziness bindness)
+void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound, bool neverUnload)
{
- // normally just non-lazy pointers are bound up front,
- // but DYLD_BIND_AT_LAUNCH will cause lazy pointers to be bound up from
- // and some dyld API's bind all lazys at runtime
- bool nonLazy = false;
- bool lazy = false;
- switch( bindness ) {
- case kNonLazyOnly:
- nonLazy = true;
- break;
- case kLazyAndNonLazy:
- nonLazy = true;
- lazy = true;
- break;
- case kLazyOnly:
- case kLazyOnlyNoDependents:
- lazy = true;
- break;
- }
- const bool doNonLazy = nonLazy && !fBoundAllNonLazy;
- const bool doLazy = lazy && !fBoundAllLazy;
- if ( doNonLazy || doLazy ) {
+ // 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
- bool oldBoundAllNonLazy = fBoundAllNonLazy;
- bool oldBoundAllLazy = fBoundAllLazy;
- fBoundAllNonLazy = fBoundAllNonLazy || nonLazy;
- fBoundAllLazy = fBoundAllLazy || lazy;
-
+ fState = dyld_image_state_bound;
+
try {
// bind lower level libraries first
- if ( bindness != kLazyOnlyNoDependents ) {
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveBind(context, bindness);
- }
+ for(unsigned int i=0; i < libraryCount(); ++i) {
+ ImageLoader* dependentImage = libImage(i);
+ if ( dependentImage != NULL )
+ dependentImage->recursiveBind(context, forceLazysBound, neverUnload);
}
// bind this image
- if ( doLazy && !doNonLazy )
- doBind(context, kLazyOnly);
- else if ( !doLazy && doNonLazy )
- doBind(context, kNonLazyOnly);
- else
- doBind(context, kLazyAndNonLazy);
+ 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
- fBoundAllNonLazy = oldBoundAllNonLazy;
- fBoundAllLazy = oldBoundAllLazy;
- throw msg;
+ fState = dyld_image_state_rebased;
+ CRSetCrashLogMessage2(NULL);
+ throw;
}
}
}
-//
-// This is complex because _dyld_register_func_for_add_image() is defined to not only
-// notify you of future image loads, but also of all currently loaded images. Therefore
-// each image needs to track that all add-image-funcs have been notified about it.
-// Since add-image-funcs cannot be removed, each has a unique index and each image
-// records the thru which index notificiation has already been done.
-//
-void ImageLoader::recursiveImageNotification(const LinkContext& context, uint32_t addImageCount)
+void ImageLoader::weakBind(const LinkContext& context)
{
- if ( fNextAddImageIndex < addImageCount ) {
- // break cycles
- const uint32_t initIndex = fNextAddImageIndex;
- fNextAddImageIndex = addImageCount;
-
- // notify all requestors about this image
- context.imageNotification(this, initIndex);
+ 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);
- // notify about lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveImageNotification(context, addImageCount);
+ // 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::recursiveImageAnnouncement(const LinkContext& context, std::vector<ImageLoader*>& newImages)
+
+void ImageLoader::recursiveGetDOFSections(const LinkContext& context, std::vector<DOFInfo>& dofs)
{
- if ( ! fAnnounced ) {
+ if ( ! fRegisteredDOF ) {
// break cycles
- fAnnounced = true;
+ fRegisteredDOF = true;
- // announce lower level libraries first
- for(unsigned int i=0; i < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveImageAnnouncement(context, newImages);
+ // 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;
- // add to list of images to notify gdb about
- newImages.push_back(this);
- //fprintf(stderr, "next size = %d\n", newImages.size());
-
- // remember that this image wants to be notified about other images
- if ( this->hasImageNotification() )
- context.addImageNeedingNotification(this);
+ // 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)
+void ImageLoader::recursiveInitialization(const LinkContext& context, mach_port_t this_thread,
+ InitializerTimingList& timingInfo, UninitedUpwards& uninitUps)
{
- if ( ! fInitialized ) {
- // break cycles
- fInitialized = true;
+ 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 < fLibrariesCount; ++i){
- DependentLibrary& libInfo = fLibraries[i];
- if ( libInfo.image != NULL )
- libInfo.image->recursiveInitialization(context);
+ 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
- this->doInitialization(context);
+ 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
- fInitialized = false;
- throw msg;
- }
- }
-}
-
-void ImageLoader::reprebindCommit(const LinkContext& context, bool commit, bool unmapOld)
-{
- // do nothing on unprebound images
- if ( ! this->isPrebindable() )
- return;
-
- // do nothing if prebinding is up to date
- if ( this->usablePrebinding(context) )
- return;
-
- // make sure we are not replacing a symlink with a file
- char realFilePath[PATH_MAX];
- if ( realpath(this->getPath(), realFilePath) == NULL ) {
- throwf("realpath() failed on %s, errno=%d", this->getPath(), errno);
- }
- // recreate temp file name
- char tempFilePath[strlen(realFilePath)+strlen("_redoprebinding")+2];
- ImageLoader::addSuffix(realFilePath, "_redoprebinding", tempFilePath);
-
- if ( commit ) {
- // all files successfully reprebound, so do swap
- int result = rename(tempFilePath, realFilePath);
- if ( result != 0 ) {
- // if there are two dylibs with the same install path, the second will fail to prebind
- // because the _redoprebinding temp file is gone. In that case, log and go on.
- if ( errno == ENOENT )
- fprintf(stderr, "update_prebinding: temp file missing: %s\n", tempFilePath);
- else
- throwf("can't swap temporary re-prebound file: rename(%s,%s) returned errno=%d", tempFilePath, realFilePath, errno);
+ fState = oldState;
+ recursiveSpinUnLock();
+ throw;
}
- else if ( unmapOld ) {
- this->prebindUnmap(context);
- }
- }
- else {
- // something went wrong during prebinding, delete the temp files
- unlink(tempFilePath);
- }
-}
-
-uint64_t ImageLoader::reprebind(const LinkContext& context, time_t timestamp)
-{
- // do nothing on unprebound images
- if ( ! this->isPrebindable() )
- return INT64_MAX;
-
- // do nothing if prebinding is up to date
- if ( this->usablePrebinding(context) ) {
- if ( context.verbosePrebinding )
- fprintf(stderr, "dyld: no need to re-prebind: %s\n", this->getPath());
- return INT64_MAX;
- }
- // recreate temp file name
- char realFilePath[PATH_MAX];
- if ( realpath(this->getPath(), realFilePath) == NULL ) {
- throwf("realpath() failed on %s, errno=%d", this->getPath(), errno);
}
- char tempFilePath[strlen(realFilePath)+strlen("_redoprebinding")+2];
- ImageLoader::addSuffix(realFilePath, "_redoprebinding", tempFilePath);
-
- // make copy of file and map it in
- uint8_t* fileToPrebind;
- uint64_t fileToPrebindSize;
- uint64_t freespace = this->copyAndMap(tempFilePath, &fileToPrebind, &fileToPrebindSize);
-
- // do format specific prebinding
- this->doPrebinding(context, timestamp, fileToPrebind);
-
- // flush and swap files
- int result = msync(fileToPrebind, fileToPrebindSize, MS_ASYNC);
- if ( result != 0 )
- throw "error syncing re-prebound file";
- result = munmap(fileToPrebind, fileToPrebindSize);
- if ( result != 0 )
- throw "error unmapping re-prebound file";
-
- // log
- if ( context.verbosePrebinding )
- fprintf(stderr, "dyld: re-prebound: %p %s\n", this->machHeader(), this->getPath());
-
- return freespace;
-}
-
-uint64_t ImageLoader::copyAndMap(const char* tempFile, uint8_t** fileToPrebind, uint64_t* fileToPrebindSize)
-{
- // reopen dylib
- int src = open(this->getPath(), O_RDONLY);
- if ( src == -1 )
- throw "can't open image";
- struct stat stat_buf;
- if ( fstat(src, &stat_buf) == -1)
- throw "can't stat image";
- if ( stat_buf.st_mtime != fLastModified )
- throw "image file changed since it was loaded";
-
- // create new file with all same permissions to hold copy of dylib
- unlink(tempFile);
- int dst = open(tempFile, O_CREAT | O_RDWR | O_TRUNC, stat_buf.st_mode);
- if ( dst == -1 )
- throw "can't create temp image";
-
- // mark source as "don't cache"
- (void)fcntl(src, F_NOCACHE, 1);
- // we want to cache the dst because we are about to map it in and modify it
- // copy permission bits
- if ( chmod(tempFile, stat_buf.st_mode & 07777) == -1 )
- throwf("can't chmod temp image. errno=%d for %s", errno, this->getPath());
- if ( chown(tempFile, stat_buf.st_uid, stat_buf.st_gid) == -1)
- throwf("can't chown temp image. errno=%d for %s", errno, this->getPath());
-
- // copy contents
- ssize_t len;
- const uint32_t kBufferSize = 128*1024;
- static uint8_t* buffer = NULL;
- if ( buffer == NULL ) {
- vm_address_t addr = 0;
- if ( vm_allocate(mach_task_self(), &addr, kBufferSize, true /*find range*/) == KERN_SUCCESS )
- buffer = (uint8_t*)addr;
- else
- throw "can't allcoate copy buffer";
- }
- while ( (len = read(src, buffer, kBufferSize)) > 0 ) {
- if ( write(dst, buffer, len) == -1 )
- throwf("write failure copying dylib errno=%d for %s", errno, this->getPath());
- }
-
- // map in dst file
- *fileToPrebindSize = stat_buf.st_size - fOffsetInFatFile; // this may map in too much, but it does not matter
- *fileToPrebind = (uint8_t*)mmap(NULL, *fileToPrebindSize, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, dst, fOffsetInFatFile);
- if ( *fileToPrebind == (uint8_t*)(-1) )
- throw "can't mmap temp image";
-
- // get free space remaining on dst volume
- struct statfs statfs_buf;
- if ( fstatfs(dst, &statfs_buf) != 0 )
- throwf("can't fstatfs(), errno=%d for %s", errno, tempFile);
- uint64_t freespace = statfs_buf.f_bavail * statfs_buf.f_bsize;
-
- // closing notes:
- // ok to close file after mapped in
- // ok to throw above without closing file because the throw will terminate update_prebinding
- int result1 = close(dst);
- int result2 = close(src);
- if ( (result1 != 0) || (result2 != 0) )
- throw "can't close file";
-
- return freespace;
+ recursiveSpinUnLock();
}
if ( sUnitsPerSecond == 0 ) {
struct mach_timebase_info timeBaseInfo;
if ( mach_timebase_info(&timeBaseInfo) == KERN_SUCCESS ) {
- sUnitsPerSecond = timeBaseInfo.denom;
+ sUnitsPerSecond = 1000000000ULL * timeBaseInfo.denom / timeBaseInfo.numer;
}
}
if ( partTime < sUnitsPerSecond ) {
- uint32_t milliSecondsTimeTen = (partTime*10000)/sUnitsPerSecond;
- uint32_t milliSeconds = milliSecondsTimeTen/10;
- uint32_t percentTimesTen = (partTime*1000)/totalTime;
+ 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;
- fprintf(stderr, "%s: %u.%u milliseconds (%u.%u%%)\n", msg, milliSeconds, milliSecondsTimeTen-milliSeconds*10, percent, percentTimesTen-percent*10);
+ dyld::log("%s: %u.%02u milliseconds (%u.%u%%)\n", msg, milliSeconds, milliSecondsTimesHundred-milliSeconds*100, percent, percentTimesTen-percent*10);
}
else {
- uint32_t secondsTimeTen = (partTime*10)/sUnitsPerSecond;
- uint32_t seconds = secondsTimeTen/100;
- uint32_t percentTimesTen = (partTime*1000)/totalTime;
+ 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;
- fprintf(stderr, "%s: %u.%u seconds (%u.%u%%)\n", msg, seconds, secondsTimeTen-seconds*10, percent, percentTimesTen-percent*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)
{
- char* result = out;
- char rawNum[30];
- sprintf(rawNum, "%llu", in);
- const int rawNumLen = strlen(rawNum);
- for(int i=0; i < rawNumLen-1; ++i) {
- *out++ = rawNum[i];
- if ( ((rawNumLen-i) % 3) == 1 )
- *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;
}
- *out++ = rawNum[rawNumLen-1];
- *out = '\0';
- return result;
-}
+ return s;
+}
-void ImageLoader::printStatistics(unsigned int imageCount)
+void ImageLoader::printStatistics(unsigned int imageCount, const InitializerTimingList& timingInfo)
{
- uint64_t totalTime = fgTotalLoadLibrariesTime + fgTotalRebaseTime + fgTotalBindTime + fgTotalNotifyTime + fgTotalInitTime;
+ uint64_t totalTime = fgTotalLoadLibrariesTime + fgTotalRebaseTime + fgTotalBindTime + fgTotalWeakBindTime + fgTotalDOF + fgTotalInitTime;
char commaNum1[40];
char commaNum2[40];
printTime("total time", totalTime, totalTime);
- fprintf(stderr, "total images loaded: %d (%d used prebinding)\n", imageCount, fgImagesWithUsedPrebinding);
+#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);
- fprintf(stderr, "total rebase fixups: %s\n", commatize(fgTotalRebaseFixups, commaNum1));
- printTime("total rebase fixups time", fgTotalRebaseFixups, totalTime);
- fprintf(stderr, "total binding fixups: %s\n", commatize(fgTotalBindFixups, commaNum1));
+ 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);
- fprintf(stderr, "total bindings lazily fixed up: %s of %s\n", commatize(fgTotalLazyBindFixups, commaNum1), commatize(fgTotalPossibleLazyBindFixups, commaNum2));
- printTime("total notify time time", fgTotalNotifyTime, totalTime);
- printTime("total init time time", fgTotalInitTime, 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);
+ }
+
}
}
-void Segment::map(int fd, uint64_t offsetInFatWrapper, intptr_t slide, const ImageLoader::LinkContext& context)
-{
- vm_offset_t fileOffset = this->getFileOffset() + offsetInFatWrapper;
- vm_size_t size = this->getFileSize();
- void* requestedLoadAddress = (void*)(this->getPreferredLoadAddress() + slide);
- int protection = 0;
- if ( !this->unaccessible() ) {
- if ( this->executable() )
- protection |= PROT_EXEC;
- if ( this->readable() )
- protection |= PROT_READ;
- if ( this->writeable() )
- protection |= PROT_WRITE;
- }
- void* loadAddress = mmap(requestedLoadAddress, size, protection, MAP_FILE | MAP_FIXED | MAP_PRIVATE, fd, fileOffset);
- if ( loadAddress == ((void*)(-1)) )
- throwf("mmap() error %d at address=0x%08lX, size=0x%08lX in Segment::map() mapping %s", errno, (uintptr_t)requestedLoadAddress, (uintptr_t)size, this->getImage()->getPath());
-
- if ( context.verboseMapping )
- fprintf(stderr, "%18s at %p->%p\n", this->getName(), loadAddress, (char*)loadAddress+this->getFileSize()-1);
-}
-
-void Segment::map(const void* memoryImage, intptr_t slide, const ImageLoader::LinkContext& context)
-{
- vm_address_t loadAddress = this->getPreferredLoadAddress() + slide;
- vm_address_t srcAddr = (uintptr_t)memoryImage + this->getFileOffset();
- vm_size_t size = this->getFileSize();
- kern_return_t r = vm_copy(mach_task_self(), srcAddr, size, loadAddress);
- if ( r != KERN_SUCCESS )
- throw "can't map segment";
-
- if ( context.verboseMapping )
- fprintf(stderr, "%18s at %p->%p\n", this->getName(), (char*)loadAddress, (char*)loadAddress+this->getFileSize()-1);
-}
-
-void Segment::setPermissions()
-{
- vm_prot_t protection = 0;
- if ( !this->unaccessible() ) {
- if ( this->executable() )
- protection |= VM_PROT_EXECUTE;
- if ( this->readable() )
- protection |= VM_PROT_READ;
- if ( this->writeable() )
- protection |= VM_PROT_WRITE;
- }
- vm_address_t addr = this->getActualLoadAddress();
- vm_size_t size = this->getSize();
- const bool setCurrentPermissions = false;
- kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, protection);
- if ( r != KERN_SUCCESS )
- throw "can't set vm permissions for mapped segment";
-}
-
-void Segment::tempWritable()
-{
- vm_address_t addr = this->getActualLoadAddress();
- vm_size_t size = this->getSize();
- const bool setCurrentPermissions = false;
- kern_return_t r = vm_protect(mach_task_self(), addr, size, setCurrentPermissions, VM_PROT_WRITE | VM_PROT_READ);
- if ( r != KERN_SUCCESS )
- throw "can't set vm permissions for mapped segment";
-}
-
-
-bool Segment::hasTrailingZeroFill()
-{
- return ( this->writeable() && (this->getSize() > this->getFileSize()) );
-}
-
-
-uintptr_t Segment::reserveAnAddressRange(size_t length, const ImageLoader::LinkContext& context)
-{
- vm_address_t addr = 0;
- vm_size_t size = length;
- if ( context.slideAndPackDylibs ) {
- addr = (fgNextNonSplitSegAddress - length) & (-4096); // page align
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, false /*use this range*/);
- if ( r != KERN_SUCCESS )
- throw "out of address space";
- fgNextNonSplitSegAddress = addr;
- }
- else {
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, true /*find range*/);
- if ( r != KERN_SUCCESS )
- throw "out of address space";
- }
- return addr;
-}
-
-bool Segment::reserveAddressRange(uintptr_t start, size_t length)
-{
- vm_address_t addr = start;
- vm_size_t size = length;
- kern_return_t r = vm_allocate(mach_task_self(), &addr, size, false /*only this range*/);
- if ( r != KERN_SUCCESS )
- return false;
- return true;
-}
+VECTOR_NEVER_DESTRUCTED_IMPL(ImageLoader::InterposeTuple);
+VECTOR_NEVER_DESTRUCTED_IMPL(ImagePair);
projects / apple / dyld.git / blobdiff