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--- dyld/dyld-210.2.3/src/ImageLoader.cpp
+++ dyld/dyld-239.4/src/ImageLoader.cpp
@@ -24,6 +24,7 @@
#define __STDC_LIMIT_MACROS
#include <stdint.h>
+#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <mach/mach.h>
@@ -65,32 +66,24 @@
ImageLoader::ImageLoader(const char* path, unsigned int libCount)
: fPath(path), fRealPath(NULL), fDevice(0), fInode(0), fLastModified(0),
- fPathHash(0), fDlopenReferenceCount(0), fStaticReferenceCount(0),
- fDynamicReferenceCount(0), fDynamicReferences(NULL), fInitializerRecursiveLock(NULL),
+ 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),
- fIsReferencedUpward(false), fWeakSymbolsBound(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)
{
- // this cannot be done in destructor because libImage() is implemented
- // in a subclass
- DependentLibraryInfo libraryInfos[image->libraryCount()];
- image->doGetDependentLibraries(libraryInfos);
- for(unsigned int i=0; i < image->libraryCount(); ++i) {
- ImageLoader* lib = image->libImage(i);
- if ( (lib != NULL) && ! libraryInfos[i].upward )
- lib->fStaticReferenceCount--;
- }
delete image;
}
@@ -101,12 +94,6 @@
delete [] fRealPath;
if ( fPathOwnedByImage && (fPath != NULL) )
delete [] fPath;
- if ( fDynamicReferences != NULL ) {
- for (std::vector<const ImageLoader*>::iterator it = fDynamicReferences->begin(); it != fDynamicReferences->end(); ++it ) {
- const_cast<ImageLoader*>(*it)->fDynamicReferenceCount--;
- }
- delete fDynamicReferences;
- }
}
void ImageLoader::setFileInfo(dev_t device, ino_t inode, time_t modDate)
@@ -120,27 +107,6 @@
{
fState = dyld_image_state_mapped;
context.notifySingle(dyld_image_state_mapped, this); // note: can throw exception
-}
-
-void ImageLoader::addDynamicReference(const ImageLoader* target)
-{
- bool alreadyInVector = false;
- if ( fDynamicReferences == NULL ) {
- fDynamicReferences = new std::vector<const ImageLoader*>();
- }
- else {
- for (std::vector<const ImageLoader*>::iterator it = fDynamicReferences->begin(); it != fDynamicReferences->end(); ++it ) {
- if ( *it == target ) {
- alreadyInVector = true;
- break;
- }
- }
- }
- if ( ! alreadyInVector ) {
- fDynamicReferences->push_back(target);
- const_cast<ImageLoader*>(target)->fDynamicReferenceCount++;
- }
- //dyld::log("dyld: addDynamicReference() from %s to %s, fDynamicReferences->size()=%lu\n", this->getPath(), target->getPath(), fDynamicReferences->size());
}
int ImageLoader::compare(const ImageLoader* right) const
@@ -304,6 +270,16 @@
}
+
+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)
@@ -375,9 +351,9 @@
this->recursiveApplyInterposing(context);
}
-void ImageLoader::link(const LinkContext& context, bool forceLazysBound, bool preflightOnly, const RPathChain& loaderRPaths)
-{
- //dyld::log("ImageLoader::link(%s) refCount=%d, neverUnload=%d\n", this->getPath(), fStaticReferenceCount, fNeverUnload);
+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);
@@ -399,10 +375,11 @@
context.notifyBatch(dyld_image_state_rebased);
uint64_t t3 = mach_absolute_time();
- this->recursiveBind(context, forceLazysBound);
+ this->recursiveBind(context, forceLazysBound, neverUnload);
uint64_t t4 = mach_absolute_time();
- this->weakBind(context);
+ if ( !context.linkingMainExecutable )
+ this->weakBind(context);
uint64_t t5 = mach_absolute_time();
context.notifyBatch(dyld_image_state_bound);
@@ -434,8 +411,7 @@
void ImageLoader::printReferenceCounts()
{
- dyld::log(" dlopen=%d, static=%d, dynamic=%d for %s\n",
- fDlopenReferenceCount, fStaticReferenceCount, fDynamicReferenceCount, getPath() );
+ dyld::log(" dlopen=%d for %s\n", fDlopenReferenceCount, getPath() );
}
@@ -483,6 +459,29 @@
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)
{
@@ -555,10 +554,8 @@
if ( fNeverUnload )
dependentLib->setNeverUnload();
if ( requiredLibInfo.upward ) {
- dependentLib->fIsReferencedUpward = true;
}
else {
- dependentLib->fStaticReferenceCount += 1;
dependentLib->fIsReferencedDownward = true;
}
LibraryInfo actualInfo = dependentLib->doGetLibraryInfo();
@@ -698,7 +695,7 @@
-void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound)
+void ImageLoader::recursiveBind(const LinkContext& context, bool forceLazysBound, bool neverUnload)
{
// Normally just non-lazy pointers are bound immediately.
// The exceptions are:
@@ -713,13 +710,16 @@
for(unsigned int i=0; i < libraryCount(); ++i) {
ImageLoader* dependentImage = libImage(i);
if ( dependentImage != NULL )
- dependentImage->recursiveBind(context, forceLazysBound);
+ 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);
}
@@ -736,6 +736,7 @@
{
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);
@@ -841,6 +842,9 @@
imagesNeedingCoalescing[i]->fWeakSymbolsBound = true;
}
}
+ uint64_t t2 = mach_absolute_time();
+ fgTotalWeakBindTime += t2 - t1;
+
if ( context.verboseWeakBind )
dyld::log("dyld: weak bind end\n");
}
@@ -863,6 +867,19 @@
}
}
+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)
{
@@ -920,7 +937,7 @@
// initialize this image
bool hasInitializers = this->doInitialization(context);
-
+
// <rdar://problem/10491874> initialize any upward depedencies
if ( hasUpwards ) {
for(unsigned int i=0; i < libraryCount(); ++i) {
@@ -1074,5 +1091,8 @@
}
-
-
+VECTOR_NEVER_DESTRUCTED_IMPL(ImageLoader::InterposeTuple);
+VECTOR_NEVER_DESTRUCTED_IMPL(ImagePair);
+
+
+