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--- dyld/dyld-733.8/dyld3/shared-cache/OptimizerLinkedit.cpp
+++ dyld/dyld-851.27/dyld3/shared-cache/OptimizerLinkedit.cpp
@@ -53,7 +53,12 @@
public:
// add a string and symbol table entry index to be updated later
void add(uint32_t symbolIndex, const char* symbolName) {
- _map[symbolName].push_back(symbolIndex);
+ _map[symbolName].push_back({ symbolIndex, false });
+ }
+
+ // add a string and symbol table entry index to be updated later
+ void addIndirect(uint32_t symbolIndex, const char* symbolName) {
+ _map[symbolName].push_back({ symbolIndex, true });
}
// copy sorted strings to buffer and update all symbol's string offsets
@@ -66,8 +71,13 @@
// append string to pool
strcpy(&dstStringPool[poolOffset], symName.c_str());
// set each string offset of each symbol using it
- for (uint32_t symbolIndex : entry.second) {
- symbolTable[symbolIndex].set_n_strx(poolOffset);
+ for (std::pair<uint32_t, bool> symbolIndexAndIndirect : entry.second) {
+ if ( symbolIndexAndIndirect.second ) {
+ // Indirect
+ symbolTable[symbolIndexAndIndirect.first].set_n_value(poolOffset);
+ } else {
+ symbolTable[symbolIndexAndIndirect.first].set_n_strx(poolOffset);
+ }
}
poolOffset += symName.size() + 1;
}
@@ -85,7 +95,7 @@
private:
- std::map<std::string, std::vector<uint32_t>> _map;
+ std::map<std::string, std::vector<std::pair<uint32_t, bool>>> _map;
};
@@ -103,11 +113,12 @@
template <typename P>
class LinkeditOptimizer {
public:
- LinkeditOptimizer(void* cacheBuffer, macho_header<P>* mh, Diagnostics& diag);
+ LinkeditOptimizer(const void* containerBuffer, macho_header<P>* mh, const char* dylibID,
+ Diagnostics& diag);
uint32_t linkeditSize() { return _linkeditSize; }
uint64_t linkeditAddr() { return _linkeditAddr; }
- const char* installName() { return _installName; }
+ const char* dylibID() { return _dylibID; }
void copyWeakBindingInfo(uint8_t* newLinkEditContent, uint32_t& offset);
void copyLazyBindingInfo(uint8_t* newLinkEditContent, uint32_t& offset);
void copyBindingInfo(uint8_t* newLinkEditContent, uint32_t& offset);
@@ -124,6 +135,9 @@
uint32_t sharedSymbolTableStartOffset, uint32_t sharedSymbolTableCount,
uint32_t sharedSymbolStringsOffset, uint32_t sharedSymbolStringsSize);
+ typedef CacheBuilder::DylibStripMode DylibStripMode;
+ void setStripMode(DylibStripMode stripMode);
+
macho_header<P>* machHeader() { return _mh; }
const std::vector<const char*> getDownwardDependents() { return _downDependentPaths; }
const std::vector<const char*> getAllDependents() { return _allDependentPaths; }
@@ -138,8 +152,11 @@
const std::vector<macho_segment_command<P>*>& segCmds() { return _segCmds; }
- static void optimizeLinkedit(CacheBuilder& builder);
- static void mergeLinkedits(CacheBuilder& builder, std::vector<LinkeditOptimizer<P>*>& optimizers);
+ static void optimizeLinkedit(CacheBuilder& builder, const void* containerBuffer,
+ CacheBuilder::UnmappedRegion* localSymbolsRegion,
+ const std::vector<std::tuple<const mach_header*, const char*, DylibStripMode>>& images);
+ static void mergeLinkedits(CacheBuilder& builder, CacheBuilder::UnmappedRegion* localSymbolsRegion,
+ std::vector<LinkeditOptimizer<P>*>& optimizers);
private:
@@ -147,12 +164,12 @@
typedef typename P::E E;
macho_header<P>* _mh;
- void* _cacheBuffer;
+ const void* _containerBuffer;
Diagnostics& _diagnostics;
uint32_t _linkeditSize = 0;
uint64_t _linkeditAddr = 0;
const uint8_t* _linkeditBias = nullptr;
- const char* _installName = nullptr;
+ const char* _dylibID = nullptr;
macho_symtab_command<P>* _symTabCmd = nullptr;
macho_dysymtab_command<P>* _dynSymTabCmd = nullptr;
macho_dyld_info_command<P>* _dyldInfo = nullptr;
@@ -182,348 +199,14 @@
uint32_t _newDataInCodeOffset = 0;
uint32_t _newIndirectSymbolTableOffset = 0;
uint64_t _dyldSectionAddr = 0;
+ DylibStripMode _stripMode = DylibStripMode::stripAll;
};
-
-template <typename P>
-class AcceleratorTables {
-public:
- AcceleratorTables(DyldSharedCache* cache, uint64_t linkeditStartAddr, Diagnostics& diag, const std::vector<LinkeditOptimizer<P>*>& optimizers);
-
- uint32_t totalSize() const;
- void copyTo(uint8_t* buffer);
-
-private:
- typedef typename P::E E;
-
- struct NodeChain;
-
- struct DepNode {
- std::vector<DepNode*> _dependents;
- unsigned _depth;
- const char* _installName;
-
- DepNode() : _depth(0), _installName(nullptr) { }
- void computeDepth();
- static void verifyUnreachable(DepNode* target, NodeChain& chain, Diagnostics& diag, std::unordered_set<DepNode*>& visitedNodes, const std::vector<DepNode*>& from);
- };
-
- struct NodeChain {
- NodeChain* prev;
- DepNode* node;
- };
-
- std::unordered_map<macho_header<P>*, DepNode> _depDAG;
- std::vector<dyld_cache_image_info_extra> _extraInfo;
- std::vector<uint8_t> _trieBytes;
- std::vector<uint16_t> _reExportArray;
- std::vector<uint16_t> _dependencyArray;
- std::vector<uint16_t> _bottomUpArray;
- std::vector<dyld_cache_accelerator_initializer> _initializers;
- std::vector<dyld_cache_accelerator_dof> _dofSections;
- std::vector<dyld_cache_range_entry> _rangeTable;
- std::unordered_map<macho_header<P>*, uint32_t> _machHeaderToImageIndex;
- std::unordered_map<std::string, macho_header<P>*> _dylibPathToMachHeader;
- std::unordered_map<macho_header<P>*, LinkeditOptimizer<P>*> _machHeaderToOptimizer;
- dyld_cache_accelerator_info _acceleratorInfoHeader;
-};
-
-
-template <typename P>
-void AcceleratorTables<P>::AcceleratorTables::DepNode::verifyUnreachable(AcceleratorTables<P>::DepNode* target, struct AcceleratorTables<P>::NodeChain& chain, Diagnostics& diag,
- std::unordered_set<DepNode*>& visitedNodes, const std::vector<AcceleratorTables<P>::DepNode*>& from) {
- for (DepNode* node : from) {
- bool foundCycle = (node == target);
- for (NodeChain* c = &chain; c->prev != nullptr; c = c->prev) {
- if ( c->node == target ) {
- foundCycle = true;
- break;
- }
- }
- if ( foundCycle ) {
- NodeChain* chp = &chain;
- std::string msg = std::string("found cycle for ") + target->_installName;
- while (chp != nullptr) {
- msg = msg + "\n " + chp->node->_installName;
- chp = chp->prev;
- }
- diag.warning("%s", msg.c_str());
- return;
- }
-
- if ( visitedNodes.count(node) )
- continue;
- visitedNodes.insert(node);
- NodeChain nextChain;
- nextChain.prev = &chain;
- nextChain.node = node;
- verifyUnreachable(target, nextChain, diag, visitedNodes, node->_dependents);
- }
-}
-
-const uint16_t kBranchIslandDylibIndex = 0x7FFF;
-
-template <typename P>
-AcceleratorTables<P>::AcceleratorTables(DyldSharedCache* cache, uint64_t linkeditStartAddr, Diagnostics& diag, const std::vector<LinkeditOptimizer<P>*>& optimizers)
-{
- // build table mapping tables to map between mach_header, index, and optimizer
- for ( LinkeditOptimizer<P>* op : optimizers ) {
- _machHeaderToOptimizer[op->machHeader()] = op;
- }
- const dyld_cache_mapping_info* mappings = (dyld_cache_mapping_info*)((uint8_t*)cache + cache->header.mappingOffset);
- uint64_t cacheStartAddress = mappings[0].address;
- const dyld_cache_image_info* images = (dyld_cache_image_info*)((uint8_t*)cache + cache->header.imagesOffset);
- for (unsigned i=0; i < cache->header.imagesCount; ++i) {
- uint64_t segCacheFileOffset = images[i].address - cacheStartAddress;
- macho_header<P>* mhMapped = (macho_header<P>*)((uint8_t*)cache+segCacheFileOffset);
- const char* path = (char*)cache + images[i].pathFileOffset;
- _dylibPathToMachHeader[path] = mhMapped;
- // don't add alias entries (path offset in pool near start of cache) to header->index map
- if ( images[i].pathFileOffset > segCacheFileOffset )
- _machHeaderToImageIndex[mhMapped] = i;
- }
-
-
- // build DAG of image dependencies
- for (LinkeditOptimizer<P>* op : optimizers) {
- _depDAG[op->machHeader()]._installName = op->installName();
- }
- for (LinkeditOptimizer<P>* op : optimizers) {
- DepNode& node = _depDAG[op->machHeader()];
- for (const char* depPath : op->getDownwardDependents()) {
- macho_header<P>* depMH = _dylibPathToMachHeader[depPath];
- if ( depMH != nullptr ) {
- DepNode* depNode = &_depDAG[depMH];
- node._dependents.push_back(depNode);
- }
- }
- }
-
- // check for cycles in DAG
- for (auto& entry : _depDAG) {
- DepNode* node = &entry.second;
- NodeChain chain;
- chain.prev = nullptr;
- chain.node = node;
- std::unordered_set<DepNode*> visitedNodes;
- DepNode::verifyUnreachable(node, chain, diag, visitedNodes, node->_dependents);
- }
-
- // compute depth for each DAG node
- for (auto& entry : _depDAG) {
- entry.second.computeDepth();
- }
-
- // build sorted (bottom up) list of images
- std::vector<macho_header<P>*> sortedMachHeaders;
- sortedMachHeaders.reserve(optimizers.size());
- for (LinkeditOptimizer<P>* op : optimizers) {
- if ( strcmp(op->installName(), "dyld_shared_cache_branch_islands") != 0 )
- sortedMachHeaders.push_back(op->machHeader());
- else
- _machHeaderToImageIndex[op->machHeader()] = kBranchIslandDylibIndex;
- }
- std::sort(sortedMachHeaders.begin(), sortedMachHeaders.end(),
- [&](macho_header<P>* lmh, macho_header<P>* rmh) -> bool {
- if ( _depDAG[lmh]._depth != _depDAG[rmh]._depth )
- return (_depDAG[lmh]._depth < _depDAG[rmh]._depth);
- else
- return (lmh < rmh);
- });
-
- // build zeroed array of extra infos
- dyld_cache_image_info_extra emptyExtra;
- emptyExtra.exportsTrieAddr = 0;
- emptyExtra.weakBindingsAddr = 0;
- emptyExtra.exportsTrieSize = 0;
- emptyExtra.weakBindingsSize = 0;
- emptyExtra.dependentsStartArrayIndex = 0;
- emptyExtra.reExportsStartArrayIndex = 0;
- _extraInfo.insert(_extraInfo.begin(), sortedMachHeaders.size(), emptyExtra);
-
- //for ( macho_header<P>* mh : sortedMachHeaders ) {
- // fprintf(stderr, "depth: %3d mh: %p path: %s\n", _depDAG[mh]._depth, mh, _machHeaderToOptimizer[mh]->installName());
- //}
-
- // build dependency table
- _dependencyArray.push_back(0xFFFF); // reserve 0 slot to be "no-dependencies"
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- unsigned index = _machHeaderToImageIndex[mh];
- auto depPaths = op->getAllDependents();
- if ( depPaths.empty() ) {
- _extraInfo[index].dependentsStartArrayIndex = 0;
- }
- else {
- _extraInfo[index].dependentsStartArrayIndex = (uint32_t)_dependencyArray.size();
- auto downPaths = op->getDownwardDependents();
- for (const char* depPath : depPaths) {
- macho_header<P>* depMH = _dylibPathToMachHeader[depPath];
- uint16_t depIndex = _machHeaderToImageIndex[depMH];
- if ( std::find(downPaths.begin(), downPaths.end(), depPath) == downPaths.end())
- depIndex |= 0x8000;
- _dependencyArray.push_back(depIndex);
- }
- _dependencyArray.push_back(0xFFFF); // mark end of list
- }
- }
-
- // build re-exports table
- _reExportArray.push_back(0xFFFF); // reserve 0 slot to be "no-re-exports"
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- unsigned index = _machHeaderToImageIndex[mh];
- auto reExPaths = op->getReExportPaths();
- if ( reExPaths.empty() ) {
- _extraInfo[index].reExportsStartArrayIndex = 0;
- }
- else {
- _extraInfo[index].reExportsStartArrayIndex = (uint32_t)_reExportArray.size();
- for (const char* reExPath : reExPaths) {
- macho_header<P>* reExMH = _dylibPathToMachHeader[reExPath];
- uint32_t reExIndex = _machHeaderToImageIndex[reExMH];
- _reExportArray.push_back(reExIndex);
- }
- _reExportArray.push_back(0xFFFF); // mark end of list
- }
- }
-
- // build ordered list of initializers
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- unsigned index = _machHeaderToImageIndex[mh];
- _bottomUpArray.push_back(index);
- for (uint64_t initializer : op->initializerAddresses()) {
- //fprintf(stderr, "0x%08llX %s\n", initializer, op->installName());
- dyld_cache_accelerator_initializer entry;
- entry.functionOffset = (uint32_t)(initializer-cacheStartAddress);
- entry.imageIndex = _machHeaderToImageIndex[mh];
- _initializers.push_back(entry);
- }
- }
-
- // build ordered list of DOF sections
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- assert(op != NULL);
- unsigned imageIndex = _machHeaderToImageIndex[mh];
- for (auto& sect : op->dofSections()) {
- //fprintf(stderr, "0x%08llX %s\n", initializer, op->installName());
- dyld_cache_accelerator_dof entry;
- entry.sectionAddress = sect->addr();
- entry.sectionSize = (uint32_t)sect->size();
- entry.imageIndex = imageIndex;
- _dofSections.push_back(entry);
- }
- }
-
-
- // register exports trie and weak binding info in each dylib with image extra info
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- unsigned index = _machHeaderToImageIndex[mh];
- _extraInfo[index].exportsTrieAddr = op->exportsTrieLinkEditOffset() + linkeditStartAddr;
- _extraInfo[index].exportsTrieSize = op->exportsTrieLinkEditSize();
- _extraInfo[index].weakBindingsAddr = op->weakBindingLinkEditOffset() + linkeditStartAddr;
- _extraInfo[index].weakBindingsSize = op->weakBindingLinkEditSize();
- }
-
- // record location of __DATA/__dyld section in libdyld.dylib
- macho_header<P>* libdyldMH = _dylibPathToMachHeader["/usr/lib/system/libdyld.dylib"];
- LinkeditOptimizer<P>* libdyldOp = _machHeaderToOptimizer[libdyldMH];
- uint64_t dyldSectionAddr = libdyldOp->dyldSectionAddress();
-
- // build range table for fast address->image lookups
- for (macho_header<P>* mh : sortedMachHeaders) {
- LinkeditOptimizer<P>* op = _machHeaderToOptimizer[mh];
- unsigned imageIndex = _machHeaderToImageIndex[mh];
- for (const macho_segment_command<P>* segCmd : op->segCmds()) {
- if ( strcmp(segCmd->segname(), "__LINKEDIT") == 0 )
- continue;
- dyld_cache_range_entry entry;
- entry.startAddress = segCmd->vmaddr();
- entry.size = (uint32_t)segCmd->vmsize();
- entry.imageIndex = imageIndex;
- _rangeTable.push_back(entry);
- }
- }
- std::sort(_rangeTable.begin(), _rangeTable.end(),
- [&](const dyld_cache_range_entry& lRange, const dyld_cache_range_entry& rRange) -> bool {
- return (lRange.startAddress < rRange.startAddress);
- });
-
- // build trie that maps install names to image index
- std::vector<DylibIndexTrie::Entry> dylibEntrys;
- for (auto &x : _dylibPathToMachHeader) {
- const std::string& path = x.first;
- unsigned index = _machHeaderToImageIndex[x.second];
- dylibEntrys.push_back(DylibIndexTrie::Entry(path, DylibIndex(index)));
- }
- DylibIndexTrie dylibsTrie(dylibEntrys);
- dylibsTrie.emit(_trieBytes);
- while ( (_trieBytes.size() % 4) != 0 )
- _trieBytes.push_back(0);
-
- // fill out header
- _acceleratorInfoHeader.version = 1;
- _acceleratorInfoHeader.imageExtrasCount = (uint32_t)_extraInfo.size();
- _acceleratorInfoHeader.imagesExtrasOffset = ALIGN_AS_TYPE(sizeof(dyld_cache_accelerator_info), dyld_cache_image_info_extra);
- _acceleratorInfoHeader.bottomUpListOffset = _acceleratorInfoHeader.imagesExtrasOffset + _acceleratorInfoHeader.imageExtrasCount*sizeof(dyld_cache_image_info_extra);
- _acceleratorInfoHeader.dylibTrieOffset = _acceleratorInfoHeader.bottomUpListOffset + _acceleratorInfoHeader.imageExtrasCount*sizeof(uint16_t);
- _acceleratorInfoHeader.dylibTrieSize = (uint32_t)_trieBytes.size();
- _acceleratorInfoHeader.initializersOffset = ALIGN_AS_TYPE(_acceleratorInfoHeader.dylibTrieOffset + _acceleratorInfoHeader.dylibTrieSize, dyld_cache_accelerator_initializer);
- _acceleratorInfoHeader.initializersCount = (uint32_t)_initializers.size();
- _acceleratorInfoHeader.dofSectionsOffset = ALIGN_AS_TYPE(_acceleratorInfoHeader.initializersOffset + _acceleratorInfoHeader.initializersCount*sizeof(dyld_cache_accelerator_initializer), dyld_cache_accelerator_initializer);
- _acceleratorInfoHeader.dofSectionsCount = (uint32_t)_dofSections.size();
- _acceleratorInfoHeader.reExportListOffset = ALIGN_AS_TYPE(_acceleratorInfoHeader.dofSectionsOffset + _acceleratorInfoHeader.dofSectionsCount*sizeof(dyld_cache_accelerator_dof), dyld_cache_accelerator_dof);
- _acceleratorInfoHeader.reExportCount = (uint32_t)_reExportArray.size();
- _acceleratorInfoHeader.depListOffset = ALIGN_AS_TYPE(_acceleratorInfoHeader.reExportListOffset + _acceleratorInfoHeader.reExportCount*sizeof(uint16_t), uint16_t);
- _acceleratorInfoHeader.depListCount = (uint32_t)_dependencyArray.size();
- _acceleratorInfoHeader.rangeTableOffset = ALIGN_AS_TYPE(_acceleratorInfoHeader.depListOffset + _acceleratorInfoHeader.depListCount*sizeof(uint16_t), dyld_cache_range_entry);
- _acceleratorInfoHeader.rangeTableCount = (uint32_t)_rangeTable.size();
- _acceleratorInfoHeader.dyldSectionAddr = dyldSectionAddr;
-}
-
-
-template <typename P>
-void AcceleratorTables<P>::DepNode::computeDepth()
-{
- if ( _depth != 0 )
- return;
- _depth = 1;
- for (DepNode* node : _dependents) {
- node->computeDepth();
- if ( node->_depth >= _depth )
- _depth = node->_depth + 1;
- }
-}
-
-template <typename P>
-uint32_t AcceleratorTables<P>::totalSize() const
-{
- return (uint32_t)align(_acceleratorInfoHeader.rangeTableOffset + _acceleratorInfoHeader.rangeTableCount*sizeof(dyld_cache_range_entry), 14);
-}
-
-template <typename P>
-void AcceleratorTables<P>::copyTo(uint8_t* buffer)
-{
- memcpy(buffer, &_acceleratorInfoHeader, sizeof(dyld_cache_accelerator_info));
- memcpy(&buffer[_acceleratorInfoHeader.imagesExtrasOffset], &_extraInfo[0], _extraInfo.size()*sizeof(dyld_cache_image_info_extra));
- memcpy(&buffer[_acceleratorInfoHeader.bottomUpListOffset], &_bottomUpArray[0], _bottomUpArray.size()*sizeof(uint16_t));
- memcpy(&buffer[_acceleratorInfoHeader.initializersOffset], &_initializers[0], _initializers.size()*sizeof(dyld_cache_accelerator_initializer));
- memcpy(&buffer[_acceleratorInfoHeader.reExportListOffset], &_reExportArray[0], _reExportArray.size()*sizeof(uint16_t));
- memcpy(&buffer[_acceleratorInfoHeader.dofSectionsOffset], &_dofSections[0], _dofSections.size()*sizeof(dyld_cache_accelerator_dof));
- memcpy(&buffer[_acceleratorInfoHeader.depListOffset], &_dependencyArray[0], _dependencyArray.size()*sizeof(uint16_t));
- memcpy(&buffer[_acceleratorInfoHeader.rangeTableOffset], &_rangeTable[0], _rangeTable.size()*sizeof(dyld_cache_range_entry));
- memcpy(&buffer[_acceleratorInfoHeader.dylibTrieOffset], &_trieBytes[0], _trieBytes.size());
-}
-
-
-
-template <typename P>
-LinkeditOptimizer<P>::LinkeditOptimizer(void* cacheBuffer, macho_header<P>* mh, Diagnostics& diag)
-: _mh(mh), _cacheBuffer(cacheBuffer), _diagnostics(diag)
+template <typename P>
+LinkeditOptimizer<P>::LinkeditOptimizer(const void* containerBuffer, macho_header<P>* mh,
+ const char* dylibID, Diagnostics& diag)
+: _mh(mh), _dylibID(dylibID), _containerBuffer(containerBuffer), _diagnostics(diag)
{
const unsigned origLoadCommandsSize = mh->sizeofcmds();
unsigned bytesRemaining = origLoadCommandsSize;
@@ -539,9 +222,6 @@
for (uint32_t i = 0; i < cmdCount; ++i) {
bool remove = false;
switch (cmd->cmd()) {
- case LC_ID_DYLIB:
- _installName = ((macho_dylib_command<P>*)cmd)->name();
- break;
case LC_SYMTAB:
_symTabCmd = (macho_symtab_command<P>*)cmd;
break;
@@ -621,6 +301,7 @@
}
}
break;
+ case LC_DYLD_CHAINED_FIXUPS:
case LC_SEGMENT_SPLIT_INFO:
remove = true;
break;
@@ -641,6 +322,11 @@
// update header
mh->set_ncmds(cmdCount - removedCount);
mh->set_sizeofcmds(origLoadCommandsSize - bytesRemaining);
+}
+
+template <typename P>
+void LinkeditOptimizer<P>::setStripMode(DylibStripMode stripMode) {
+ _stripMode = stripMode;
}
/*
@@ -746,20 +432,22 @@
_symTabCmd->set_strsize(sharedSymbolStringsSize);
// update dynamic symbol table to have proper offsets into shared symbol table
- _dynSymTabCmd->set_ilocalsym(0);
- _dynSymTabCmd->set_nlocalsym(_newLocalSymbolCount);
- _dynSymTabCmd->set_iextdefsym(_newExportedSymbolsStartIndex-_newLocalSymbolsStartIndex);
- _dynSymTabCmd->set_nextdefsym(_newExportedSymbolCount);
- _dynSymTabCmd->set_iundefsym(_newImportedSymbolsStartIndex-_newLocalSymbolsStartIndex);
- _dynSymTabCmd->set_nundefsym(_newImportedSymbolCount);
- _dynSymTabCmd->set_tocoff(0);
- _dynSymTabCmd->set_ntoc(0);
- _dynSymTabCmd->set_modtaboff(0);
- _dynSymTabCmd->set_nmodtab(0);
- _dynSymTabCmd->set_indirectsymoff(mergedLinkeditStartOffset + _newIndirectSymbolTableOffset);
- _dynSymTabCmd->set_extreloff(0);
- _dynSymTabCmd->set_locreloff(0);
- _dynSymTabCmd->set_nlocrel(0);
+ if ( _dynSymTabCmd != nullptr ) {
+ _dynSymTabCmd->set_ilocalsym(0);
+ _dynSymTabCmd->set_nlocalsym(_newLocalSymbolCount);
+ _dynSymTabCmd->set_iextdefsym(_newExportedSymbolsStartIndex-_newLocalSymbolsStartIndex);
+ _dynSymTabCmd->set_nextdefsym(_newExportedSymbolCount);
+ _dynSymTabCmd->set_iundefsym(_newImportedSymbolsStartIndex-_newLocalSymbolsStartIndex);
+ _dynSymTabCmd->set_nundefsym(_newImportedSymbolCount);
+ _dynSymTabCmd->set_tocoff(0);
+ _dynSymTabCmd->set_ntoc(0);
+ _dynSymTabCmd->set_modtaboff(0);
+ _dynSymTabCmd->set_nmodtab(0);
+ _dynSymTabCmd->set_indirectsymoff(mergedLinkeditStartOffset + _newIndirectSymbolTableOffset);
+ _dynSymTabCmd->set_extreloff(0);
+ _dynSymTabCmd->set_locreloff(0);
+ _dynSymTabCmd->set_nlocrel(0);
+ }
// update dyld info
if ( _dyldInfo != nullptr ) {
@@ -867,11 +555,27 @@
bool redact, std::vector<LocalSymbolInfo>& localSymbolInfos,
std::vector<macho_nlist<P>>& unmappedLocalSymbols, SortedStringPool<P>& localSymbolsStringPool)
{
- LocalSymbolInfo localInfo;
- localInfo.dylibOffset = (uint32_t)(((uint8_t*)_mh) - (uint8_t*)_cacheBuffer);
+ localSymbolInfos.push_back(LocalSymbolInfo());
+
+ LocalSymbolInfo& localInfo = localSymbolInfos.back();
+ localInfo.dylibOffset = (uint32_t)(((uint8_t*)_mh) - (uint8_t*)_containerBuffer);
localInfo.nlistStartIndex = (uint32_t)unmappedLocalSymbols.size();
localInfo.nlistCount = 0;
_newLocalSymbolsStartIndex = symbolIndex;
+ _newLocalSymbolCount = 0;
+
+ switch (_stripMode) {
+ case CacheBuilder::DylibStripMode::stripNone:
+ case CacheBuilder::DylibStripMode::stripExports:
+ break;
+ case CacheBuilder::DylibStripMode::stripLocals:
+ case CacheBuilder::DylibStripMode::stripAll:
+ return;
+ }
+
+ if ( _dynSymTabCmd == nullptr )
+ return;
+
const char* strings = (char*)&_linkeditBias[_symTabCmd->stroff()];
const macho_nlist<P>* const symbolTable = (macho_nlist<P>*)(&_linkeditBias[_symTabCmd->symoff()]);
const macho_nlist<P>* const firstExport = &symbolTable[_dynSymTabCmd->ilocalsym()];
@@ -904,7 +608,6 @@
}
_newLocalSymbolCount = symbolIndex - _newLocalSymbolsStartIndex;
localInfo.nlistCount = (uint32_t)unmappedLocalSymbols.size() - localInfo.nlistStartIndex;
- localSymbolInfos.push_back(localInfo);
}
@@ -912,6 +615,20 @@
void LinkeditOptimizer<P>::copyExportedSymbols(uint8_t* newLinkEditContent, SortedStringPool<P>& stringPool, uint32_t& offset, uint32_t& symbolIndex)
{
_newExportedSymbolsStartIndex = symbolIndex;
+ _newExportedSymbolCount = 0;
+
+ switch (_stripMode) {
+ case CacheBuilder::DylibStripMode::stripNone:
+ case CacheBuilder::DylibStripMode::stripLocals:
+ break;
+ case CacheBuilder::DylibStripMode::stripExports:
+ case CacheBuilder::DylibStripMode::stripAll:
+ return;
+ }
+
+ if ( _dynSymTabCmd == nullptr )
+ return;
+
const char* strings = (char*)&_linkeditBias[_symTabCmd->stroff()];
const macho_nlist<P>* const symbolTable = (macho_nlist<P>*)(&_linkeditBias[_symTabCmd->symoff()]);
const macho_nlist<P>* const firstExport = &symbolTable[_dynSymTabCmd->iextdefsym()];
@@ -940,6 +657,20 @@
void LinkeditOptimizer<P>::copyImportedSymbols(uint8_t* newLinkEditContent, SortedStringPool<P>& stringPool, uint32_t& offset, uint32_t& symbolIndex)
{
_newImportedSymbolsStartIndex = symbolIndex;
+ _newImportedSymbolCount = 0;
+
+ if ( _dynSymTabCmd == nullptr )
+ return;
+
+ switch (_stripMode) {
+ case CacheBuilder::DylibStripMode::stripNone:
+ break;
+ case CacheBuilder::DylibStripMode::stripLocals:
+ case CacheBuilder::DylibStripMode::stripExports:
+ case CacheBuilder::DylibStripMode::stripAll:
+ return;
+ }
+
const char* strings = (char*)&_linkeditBias[_symTabCmd->stroff()];
const macho_nlist<P>* const symbolTable = (macho_nlist<P>*)(&_linkeditBias[_symTabCmd->symoff()]);
const macho_nlist<P>* const firstImport = &symbolTable[_dynSymTabCmd->iundefsym()];
@@ -964,6 +695,10 @@
void LinkeditOptimizer<P>::copyIndirectSymbolTable(uint8_t* newLinkEditContent, uint32_t& offset)
{
_newIndirectSymbolTableOffset = offset;
+
+ if ( _dynSymTabCmd == nullptr )
+ return;
+
const uint32_t* const indirectTable = (uint32_t*)&_linkeditBias[_dynSymTabCmd->indirectsymoff()];
uint32_t* newIndirectTable = (uint32_t*)&newLinkEditContent[offset];
for (uint32_t i=0; i < _dynSymTabCmd->nindirectsyms(); ++i) {
@@ -977,7 +712,9 @@
}
template <typename P>
-void LinkeditOptimizer<P>::mergeLinkedits(CacheBuilder& builder, std::vector<LinkeditOptimizer<P>*>& optimizers)
+void LinkeditOptimizer<P>::mergeLinkedits(CacheBuilder& builder,
+ CacheBuilder::UnmappedRegion* localSymbolsRegion,
+ std::vector<LinkeditOptimizer<P>*>& optimizers)
{
// allocate space for new linkedit data
uint64_t totalUnoptLinkeditsSize = builder._readOnlyRegion.sizeInUse - builder._nonLinkEditReadOnlySize;
@@ -1027,9 +764,11 @@
builder._diagnostics.verbose(" lazy bindings size: %5uKB\n", (offset-startLazyBindingsInfosOffset)/1024);
}
+ bool unmapLocals = ( builder._options.localSymbolMode == DyldSharedCache::LocalSymbolsMode::unmap );
+
// copy symbol table entries
std::vector<macho_nlist<P>> unmappedLocalSymbols;
- if ( builder._options.excludeLocalSymbols )
+ if ( unmapLocals )
unmappedLocalSymbols.reserve(0x01000000);
std::vector<LocalSymbolInfo> localSymbolInfos;
localSymbolInfos.reserve(optimizers.size());
@@ -1039,7 +778,7 @@
uint32_t sharedSymbolTableExportsCount = 0;
uint32_t sharedSymbolTableImportsCount = 0;
for (LinkeditOptimizer<P>* op : optimizers) {
- op->copyLocalSymbols(newLinkEdit, stringPool, offset, symbolIndex, builder._options.excludeLocalSymbols,
+ op->copyLocalSymbols(newLinkEdit, stringPool, offset, symbolIndex, unmapLocals,
localSymbolInfos, unmappedLocalSymbols, localSymbolsStringPool);
uint32_t x = symbolIndex;
op->copyExportedSymbols(newLinkEdit, stringPool, offset, symbolIndex);
@@ -1081,7 +820,6 @@
uint64_t newLinkeditAlignedSize = align(offset, 14);
builder._diagnostics.verbose(" symbol table size: %5uKB (%d exports, %d imports)\n", (sharedSymbolTableEndOffset-sharedSymbolTableStartOffset)/1024, sharedSymbolTableExportsCount, sharedSymbolTableImportsCount);
builder._diagnostics.verbose(" symbol string pool size: %5uKB\n", sharedSymbolStringsSize/1024);
- builder._sharedStringsPoolVmOffset = (uint32_t)((builder._readOnlyRegion.unslidLoadAddress - builder._readExecuteRegion.unslidLoadAddress) + builder._nonLinkEditReadOnlySize + sharedSymbolStringsOffset);
// overwrite mapped LINKEDIT area in cache with new merged LINKEDIT content
builder._diagnostics.verbose("LINKEDITS optimized from %uMB to %uMB\n", (uint32_t)totalUnoptLinkeditsSize/(1024*1024), (uint32_t)newLinkeditUnalignedSize/(1024*1024));
@@ -1089,27 +827,8 @@
::free(newLinkEdit);
builder._readOnlyRegion.sizeInUse = builder._nonLinkEditReadOnlySize + newLinkeditAlignedSize;
- // If making cache for customers, add extra accelerator tables for dyld
- DyldSharedCache* cacheHeader = (DyldSharedCache*)builder._readExecuteRegion.buffer;
- if ( builder._options.optimizeStubs ) {
- uint64_t addrWhereAccTablesWillBe = builder._readOnlyRegion.unslidLoadAddress+builder._readOnlyRegion.sizeInUse;
- uint64_t addrWhereMergedLinkWillStart = builder._readOnlyRegion.unslidLoadAddress+builder._nonLinkEditReadOnlySize;
- AcceleratorTables<P> tables(cacheHeader, addrWhereMergedLinkWillStart, builder._diagnostics, optimizers);
- uint32_t tablesSize = tables.totalSize();
- if ( tablesSize < (builder._readOnlyRegion.bufferSize - builder._readOnlyRegion.sizeInUse) ) {
- tables.copyTo(builder._readOnlyRegion.buffer+builder._readOnlyRegion.sizeInUse);
- cacheHeader->header.accelerateInfoAddr = addrWhereAccTablesWillBe;
- cacheHeader->header.accelerateInfoSize = tablesSize;
- builder._readOnlyRegion.sizeInUse += align(tablesSize, 14);
- builder._diagnostics.verbose("Accelerator tables %uMB\n", (uint32_t)tablesSize/(1024*1024));
- }
- else {
- builder._diagnostics.warning("not enough room to add dyld accelerator tables");
- }
- }
-
// overwrite end of un-opt linkedits to create a new unmapped region for local symbols
- if ( builder._options.excludeLocalSymbols ) {
+ if ( unmapLocals ) {
const uint32_t entriesOffset = sizeof(dyld_cache_local_symbols_info);
const uint32_t entriesCount = (uint32_t)localSymbolInfos.size();
const uint32_t nlistOffset = (uint32_t)align(entriesOffset + entriesCount * sizeof(dyld_cache_local_symbols_info), 4); // 16-byte align start
@@ -1140,12 +859,10 @@
::memcpy(newLocalsSymbolTable, &unmappedLocalSymbols[0], nlistCount*sizeof(macho_nlist<P>));
// copy string pool
localSymbolsStringPool.copyPoolAndUpdateOffsets(((char*)infoHeader)+stringsOffset, newLocalsSymbolTable);
- // update cache header
- cacheHeader->header.localSymbolsSize = localsBufferSize;
// return buffer of local symbols, caller to free() it
- builder._localSymbolsRegion.buffer = (uint8_t*)localsBuffer;
- builder._localSymbolsRegion.bufferSize = localsBufferSize;
- builder._localSymbolsRegion.sizeInUse = localsBufferSize;
+ localSymbolsRegion->buffer = (uint8_t*)localsBuffer;
+ localSymbolsRegion->bufferSize = localsBufferSize;
+ localSymbolsRegion->sizeInUse = localsBufferSize;
}
else {
builder._diagnostics.warning("could not allocate local symbols");
@@ -1164,14 +881,16 @@
template <typename P>
-void LinkeditOptimizer<P>::optimizeLinkedit(CacheBuilder& builder)
-{
- DyldSharedCache* cache = (DyldSharedCache*)builder._readExecuteRegion.buffer;
+void LinkeditOptimizer<P>::optimizeLinkedit(CacheBuilder& builder, const void* containerBuffer,
+ CacheBuilder::UnmappedRegion* localSymbolsRegion,
+ const std::vector<std::tuple<const mach_header*, const char*, DylibStripMode>>& images)
+{
// construct a LinkeditOptimizer for each image
__block std::vector<LinkeditOptimizer<P>*> optimizers;
- cache->forEachImage(^(const mach_header* mh, const char*) {
- optimizers.push_back(new LinkeditOptimizer<P>(cache, (macho_header<P>*)mh, builder._diagnostics));
- });
+ for (std::tuple<const mach_header*, const char*, DylibStripMode> image : images) {
+ optimizers.push_back(new LinkeditOptimizer<P>(containerBuffer, (macho_header<P>*)std::get<0>(image), std::get<1>(image), builder._diagnostics));
+ optimizers.back()->setStripMode(std::get<2>(image));
+ }
#if 0
// add optimizer for each branch pool
for (uint64_t poolOffset : branchPoolOffsets) {
@@ -1180,22 +899,26 @@
}
#endif
// merge linkedit info
- mergeLinkedits(builder, optimizers);
+ mergeLinkedits(builder, localSymbolsRegion, optimizers);
// delete optimizers
for (LinkeditOptimizer<P>* op : optimizers)
delete op;
}
-void CacheBuilder::optimizeLinkedit()
-{
- if ( _archLayout->is64 ) {
- return LinkeditOptimizer<Pointer64<LittleEndian>>::optimizeLinkedit(*this);
+void CacheBuilder::optimizeLinkedit(UnmappedRegion* localSymbolsRegion,
+ const std::vector<std::tuple<const mach_header*, const char*, DylibStripMode>>& images)
+{
+ const void* buffer = (const void*)_fullAllocatedBuffer;
+ if ( _is64 ) {
+ return LinkeditOptimizer<Pointer64<LittleEndian>>::optimizeLinkedit(*this, buffer,
+ localSymbolsRegion, images);
}
else {
- return LinkeditOptimizer<Pointer32<LittleEndian>>::optimizeLinkedit(*this);
- }
-}
-
-
-
+ return LinkeditOptimizer<Pointer32<LittleEndian>>::optimizeLinkedit(*this, buffer,
+ localSymbolsRegion, images);
+ }
+}
+
+
+