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--- /dev/null
+++ dyld/dyld-732.8/dyld3/shared-cache/OptimizerObjC.cpp
@@ -0,0 +1,1139 @@
+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+ *
+ * Copyright (c) 2014 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+#include <dirent.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <mach-o/loader.h>
+#include <mach-o/fat.h>
+#include <assert.h>
+
+#include "DyldSharedCache.h"
+#include "Diagnostics.h"
+#include "CacheBuilder.h"
+#include "FileAbstraction.hpp"
+#include "MachOFileAbstraction.hpp"
+#include "MachOLoaded.h"
+#include "MachOAnalyzer.h"
+
+#ifndef MH_HAS_OBJC
+ #define MH_HAS_OBJC 0x40000000
+#endif
+
+// Scan a C++ or Swift length-mangled field.
+static bool scanMangledField(const char *&string, const char *end,
+ const char *&field, int& length)
+{
+ // Leading zero not allowed.
+ if (*string == '0') return false;
+
+ length = 0;
+ field = string;
+ while (field < end) {
+ char c = *field;
+ if (!isdigit(c)) break;
+ field++;
+ if (__builtin_smul_overflow(length, 10, &length)) return false;
+ if (__builtin_sadd_overflow(length, c - '0', &length)) return false;
+ }
+
+ string = field + length;
+ return length > 0 && string <= end;
+}
+
+
+// copySwiftDemangledName
+// Returns the pretty form of the given Swift-mangled class or protocol name.
+// Returns nullptr if the string doesn't look like a mangled Swift name.
+// The result must be freed with free().
+static char *copySwiftDemangledName(const char *string, bool isProtocol = false)
+{
+ if (!string) return nullptr;
+
+ // Swift mangling prefix.
+ if (strncmp(string, isProtocol ? "_TtP" : "_TtC", 4) != 0) return nullptr;
+ string += 4;
+
+ const char *end = string + strlen(string);
+
+ // Module name.
+ const char *prefix;
+ int prefixLength;
+ if (string[0] == 's') {
+ // "s" is the Swift module.
+ prefix = "Swift";
+ prefixLength = 5;
+ string += 1;
+ } else {
+ if (! scanMangledField(string, end, prefix, prefixLength)) return nullptr;
+ }
+
+ // Class or protocol name.
+ const char *suffix;
+ int suffixLength;
+ if (! scanMangledField(string, end, suffix, suffixLength)) return nullptr;
+
+ if (isProtocol) {
+ // Remainder must be "_".
+ if (strcmp(string, "_") != 0) return nullptr;
+ } else {
+ // Remainder must be empty.
+ if (string != end) return nullptr;
+ }
+
+ char *result;
+ asprintf(&result, "%.*s.%.*s", prefixLength,prefix, suffixLength,suffix);
+ return result;
+}
+
+
+class ContentAccessor {
+public:
+ ContentAccessor(const DyldSharedCache* cache, Diagnostics& diag)
+ : _diagnostics(diag)
+ {
+ _cacheStart = (uint8_t*)cache;
+ _cacheUnslideAddr = cache->unslidLoadAddress();
+ _slide = (uint64_t)cache - _cacheUnslideAddr;
+#if SUPPORT_ARCH_arm64e
+ _chainedFixups = (strcmp(cache->archName(), "arm64e") == 0);
+#else
+ _chainedFixups = false;
+#endif
+ }
+
+ // Converts from an on disk vmAddr to the real vmAddr
+ // That is, for a chained fixup, decodes the chain, for a non-chained fixup, does nothing.
+ uint64_t vmAddrForOnDiskVMAddr(uint64_t vmaddr) {
+ if ( _chainedFixups ) {
+ dyld3::MachOLoaded::ChainedFixupPointerOnDisk ptr;
+ ptr.raw64 = vmaddr;
+ assert(ptr.arm64e.authRebase.bind == 0);
+ if ( ptr.arm64e.authRebase.auth ) {
+ vmaddr = _cacheUnslideAddr + ptr.arm64e.authRebase.target;
+ }
+ else {
+ vmaddr = ptr.arm64e.unpackTarget();
+ }
+ }
+ return vmaddr;
+ }
+
+ void* contentForVMAddr(uint64_t vmaddr) {
+ vmaddr = vmAddrForOnDiskVMAddr(vmaddr);
+ if ( vmaddr != 0 ) {
+ uint64_t offset = vmaddr - _cacheUnslideAddr;
+ return _cacheStart + offset;
+ } else
+ return nullptr;
+ }
+
+ uint64_t vmAddrForContent(const void* content) {
+ if ( content != nullptr )
+ return _cacheUnslideAddr + ((uint8_t*)content - _cacheStart);
+ else
+ return 0;
+ }
+
+ Diagnostics& diagnostics() { return _diagnostics; }
+
+private:
+ Diagnostics& _diagnostics;
+ uint64_t _slide;
+ uint64_t _cacheUnslideAddr;
+ uint8_t* _cacheStart;
+ bool _chainedFixups;
+};
+
+
+// Access a section containing a list of pointers
+template <typename P, typename T>
+class PointerSection
+{
+ typedef typename P::uint_t pint_t;
+public:
+ PointerSection(ContentAccessor* cache, const macho_header<P>* mh,
+ const char* segname, const char* sectname)
+ : _cache(cache),
+ _section(mh->getSection(segname, sectname)),
+ _base(_section ? (pint_t*)cache->contentForVMAddr(_section->addr()) : 0),
+ _count(_section ? (pint_t)(_section->size() / sizeof(pint_t)) : 0) {
+ }
+
+ pint_t count() const { return _count; }
+
+ pint_t getVMAddress(pint_t index) const {
+ if ( index >= _count ) {
+ _cache->diagnostics().error("index out of range in section %s", _section->sectname());
+ return 0;
+ }
+ return (pint_t)P::getP(_base[index]);
+ }
+
+ pint_t getSectionVMAddress() const {
+ return (pint_t)_section->addr();
+ }
+
+ T get(pint_t index) const {
+ return (T)_cache->contentForVMAddr(getVMAddress(index));
+ }
+
+ void setVMAddress(pint_t index, pint_t value) {
+ if ( index >= _count ) {
+ _cache->diagnostics().error("index out of range in section %s", _section->sectname());
+ return;
+ }
+ P::setP(_base[index], value);
+ }
+
+ void removeNulls() {
+ pint_t shift = 0;
+ for (pint_t i = 0; i < _count; i++) {
+ pint_t value = _base[i];
+ if (value) {
+ _base[i-shift] = value;
+ } else {
+ shift++;
+ }
+ }
+ _count -= shift;
+ const_cast<macho_section<P>*>(_section)->set_size(_count * sizeof(pint_t));
+ }
+
+private:
+ ContentAccessor* const _cache;
+ const macho_section<P>* const _section;
+ pint_t* const _base;
+ pint_t const _count;
+};
+
+
+// Access a section containing an array of structures
+template <typename P, typename T>
+class ArraySection
+{
+public:
+ ArraySection(ContentAccessor* cache, const macho_header<P>* mh,
+ const char *segname, const char *sectname)
+ : _cache(cache),
+ _section(mh->getSection(segname, sectname)),
+ _base(_section ? (T *)cache->contentForVMAddr(_section->addr()) : 0),
+ _count(_section ? _section->size() / sizeof(T) : 0) {
+ }
+
+ uint64_t count() const { return _count; }
+
+ T& get(uint64_t index) const {
+ if (index >= _count) {
+ _cache->diagnostics().error("index out of range in section %s", _section->sectname());
+ }
+ return _base[index];
+ }
+
+private:
+ ContentAccessor* const _cache;
+ const macho_section<P>* const _section;
+ T * const _base;
+ uint64_t const _count;
+};
+
+
+#define SELOPT_WRITE
+#include "objc-shared-cache.h"
+#include "ObjC1Abstraction.hpp"
+#include "ObjC2Abstraction.hpp"
+
+
+namespace {
+
+
+
+template <typename P>
+class ObjCSelectorUniquer
+{
+public:
+ typedef typename P::uint_t pint_t;
+
+ ObjCSelectorUniquer(ContentAccessor* cache) : _cache(cache) { }
+
+ pint_t visit(pint_t oldValue)
+ {
+ _count++;
+ const char *s = (const char *)_cache->contentForVMAddr(oldValue);
+ oldValue = (pint_t)_cache->vmAddrForOnDiskVMAddr(oldValue);
+ objc_opt::string_map::iterator element =
+ _selectorStrings.insert(objc_opt::string_map::value_type(s, oldValue)).first;
+ return (pint_t)element->second;
+ }
+
+ void visitCoalescedStrings(const CacheBuilder::CacheCoalescedText& coalescedText) {
+ const CacheBuilder::CacheCoalescedText::StringSection& methodNames = coalescedText.getSectionData("__objc_methname");
+ for (const auto& stringAndOffset : methodNames.stringsToOffsets) {
+ uint64_t vmAddr = methodNames.bufferVMAddr + stringAndOffset.second;
+ _selectorStrings[stringAndOffset.first.data()] = vmAddr;
+ }
+ }
+
+ objc_opt::string_map& strings() {
+ return _selectorStrings;
+ }
+
+ size_t count() const { return _count; }
+
+private:
+ objc_opt::string_map _selectorStrings;
+ ContentAccessor* _cache;
+ size_t _count = 0;
+};
+
+
+template <typename P>
+class ClassListBuilder
+{
+private:
+ objc_opt::string_map _classNames;
+ objc_opt::class_map _classes;
+ size_t _count = 0;
+ HeaderInfoOptimizer<P, objc_header_info_ro_t<P>>& _hInfos;
+
+public:
+
+ ClassListBuilder(HeaderInfoOptimizer<P, objc_header_info_ro_t<P>>& hinfos) : _hInfos(hinfos) { }
+
+ void visitClass(ContentAccessor* cache,
+ const macho_header<P>* header,
+ objc_class_t<P>* cls)
+ {
+ if (cls->isMetaClass(cache)) return;
+
+ const char *name = cls->getName(cache);
+ uint64_t name_vmaddr = cache->vmAddrForContent((void*)name);
+ uint64_t cls_vmaddr = cache->vmAddrForContent(cls);
+ uint64_t hinfo_vmaddr = cache->vmAddrForContent(_hInfos.hinfoForHeader(cache, header));
+ _classNames.insert(objc_opt::string_map::value_type(name, name_vmaddr));
+ _classes.insert(objc_opt::class_map::value_type(name, std::pair<uint64_t, uint64_t>(cls_vmaddr, hinfo_vmaddr)));
+ _count++;
+ }
+
+ objc_opt::string_map& classNames() {
+ return _classNames;
+ }
+
+ objc_opt::class_map& classes() {
+ return _classes;
+ }
+
+ size_t count() const { return _count; }
+};
+
+template <typename P>
+class ProtocolOptimizer
+{
+private:
+ typedef typename P::uint_t pint_t;
+
+ objc_opt::string_map _protocolNames;
+ objc_opt::legacy_protocol_map _protocols;
+ objc_opt::protocol_map _protocolsAndHeaders;
+ size_t _protocolCount;
+ size_t _protocolReferenceCount;
+ Diagnostics& _diagnostics;
+ HeaderInfoOptimizer<P, objc_header_info_ro_t<P>>& _hInfos;
+
+ friend class ProtocolReferenceWalker<P, ProtocolOptimizer<P>>;
+
+ pint_t visitProtocolReference(ContentAccessor* cache, pint_t oldValue)
+ {
+ objc_protocol_t<P>* proto = (objc_protocol_t<P>*)
+ cache->contentForVMAddr(oldValue);
+ pint_t newValue = (pint_t)_protocols[proto->getName(cache)];
+ if (oldValue != newValue) _protocolReferenceCount++;
+ return newValue;
+ }
+
+public:
+
+ ProtocolOptimizer(Diagnostics& diag, HeaderInfoOptimizer<P, objc_header_info_ro_t<P>>& hinfos)
+ : _protocolCount(0), _protocolReferenceCount(0), _diagnostics(diag), _hInfos(hinfos) {
+ }
+
+ void addProtocols(ContentAccessor* cache, const macho_header<P>* header)
+ {
+ PointerSection<P, objc_protocol_t<P> *>
+ protocols(cache, header, "__DATA", "__objc_protolist");
+
+ for (pint_t i = 0; i < protocols.count(); i++) {
+ objc_protocol_t<P> *proto = protocols.get(i);
+
+ const char *name = proto->getName(cache);
+ if (_protocolNames.count(name) == 0) {
+ if (proto->getSize() > sizeof(objc_protocol_t<P>)) {
+ _diagnostics.error("objc protocol is too big");
+ return;
+ }
+ uint64_t name_vmaddr = cache->vmAddrForContent((void*)name);
+ uint64_t proto_vmaddr = cache->vmAddrForContent(proto);
+ _protocolNames.insert(objc_opt::string_map::value_type(name, name_vmaddr));
+ _protocols.insert(objc_opt::legacy_protocol_map::value_type(name, proto_vmaddr));
+ _protocolCount++;
+ }
+
+ // Note down which header this protocol came from. We'll fill in the proto_vmaddr here later
+ // once we've chosen a single definition for the protocol with this name.
+ uint64_t hinfo_vmaddr = cache->vmAddrForContent(_hInfos.hinfoForHeader(cache, header));
+ _protocolsAndHeaders.insert(objc_opt::class_map::value_type(name, std::pair<uint64_t, uint64_t>(0, hinfo_vmaddr)));
+ }
+ }
+
+ const char *writeProtocols(ContentAccessor* cache,
+ uint8_t *& rwdest, size_t& rwremaining,
+ uint8_t *& rodest, size_t& roremaining,
+ CacheBuilder::ASLR_Tracker& aslrTracker,
+ pint_t protocolClassVMAddr)
+ {
+ if (_protocolCount == 0) return NULL;
+
+ if (protocolClassVMAddr == 0) {
+ return "libobjc's Protocol class symbol not found (metadata not optimized)";
+ }
+
+ size_t rwrequired = _protocolCount * sizeof(objc_protocol_t<P>);
+ if (rwremaining < rwrequired) {
+ return "libobjc's read-write section is too small (metadata not optimized)";
+ }
+
+ for (auto iter = _protocols.begin(); iter != _protocols.end(); ++iter)
+ {
+ objc_protocol_t<P>* oldProto = (objc_protocol_t<P>*)
+ cache->contentForVMAddr(iter->second);
+
+ // Create a new protocol object.
+ objc_protocol_t<P>* proto = (objc_protocol_t<P>*)rwdest;
+ rwdest += sizeof(*proto);
+ rwremaining -= sizeof(*proto);
+
+ // Initialize it.
+ uint32_t oldSize = oldProto->getSize();
+ memcpy(proto, oldProto, oldSize);
+ if (!proto->getIsaVMAddr()) {
+ proto->setIsaVMAddr(protocolClassVMAddr);
+ }
+ if (oldSize < sizeof(*proto)) {
+ // Protocol object is old. Populate new fields.
+ proto->setSize(sizeof(objc_protocol_t<P>));
+ // missing extendedMethodTypes is already nil
+ }
+ // Some protocol objects are big enough to have the
+ // demangledName field but don't initialize it.
+ // Initialize it here if it is not already set.
+ if (!proto->getDemangledName(cache)) {
+ const char *roName = proto->getName(cache);
+ char *demangledName = copySwiftDemangledName(roName, true);
+ if (demangledName) {
+ size_t length = 1 + strlen(demangledName);
+ if (roremaining < length) {
+ return "libobjc's read-only section is too small (metadata not optimized)";
+ }
+
+ memmove(rodest, demangledName, length);
+ roName = (const char *)rodest;
+ rodest += length;
+ roremaining -= length;
+
+ free(demangledName);
+ }
+ proto->setDemangledName(cache, roName, _diagnostics);
+ }
+ proto->setFixedUp();
+ proto->setIsCanonical();
+
+ // Redirect the protocol table at our new object.
+ iter->second = cache->vmAddrForContent(proto);
+
+ // Add new rebase entries.
+ proto->addPointers(cache, aslrTracker);
+ }
+
+ // Now that we've chosen the canonical protocols, set the duplicate headers to
+ // point to their protocols.
+ for (auto iter = _protocolsAndHeaders.begin(); iter != _protocolsAndHeaders.end(); ++iter) {
+ iter->second.first = _protocols[iter->first];
+ }
+
+ return NULL;
+ }
+
+ void updateReferences(ContentAccessor* cache, const macho_header<P>* header)
+ {
+ ProtocolReferenceWalker<P, ProtocolOptimizer<P>> refs(*this);
+ refs.walk(cache, header);
+ }
+
+ objc_opt::string_map& protocolNames() {
+ return _protocolNames;
+ }
+
+ objc_opt::legacy_protocol_map& protocols() {
+ return _protocols;
+ }
+
+ objc_opt::protocol_map& protocolsAndHeaders() {
+ return _protocolsAndHeaders;
+ }
+
+ size_t protocolCount() const { return _protocolCount; }
+ size_t protocolReferenceCount() const { return _protocolReferenceCount; }
+};
+
+
+static int percent(size_t num, size_t denom) {
+ if (denom)
+ return (int)(num / (double)denom * 100);
+ else
+ return 100;
+}
+
+template <typename P>
+void addObjcSegments(Diagnostics& diag, DyldSharedCache* cache, const mach_header* libobjcMH,
+ uint8_t* objcReadOnlyBuffer, uint64_t objcReadOnlyBufferSizeAllocated,
+ uint8_t* objcReadWriteBuffer, uint64_t objcReadWriteBufferSizeAllocated,
+ uint32_t objcRwFileOffset)
+{
+ // validate there is enough free space to add the load commands
+ const dyld3::MachOAnalyzer* libobjcMA = ((dyld3::MachOAnalyzer*)libobjcMH);
+ uint32_t freeSpace = libobjcMA->loadCommandsFreeSpace();
+ const uint32_t segSize = sizeof(macho_segment_command<P>);
+ if ( freeSpace < 2*segSize ) {
+ diag.warning("not enough space in libojbc.dylib to add load commands for objc optimization regions");
+ return;
+ }
+
+ // find location of LINKEDIT LC_SEGMENT load command, we need to insert new segments before it
+ __block uint8_t* linkeditSeg = nullptr;
+ libobjcMA->forEachSegment(^(const dyld3::MachOFile::SegmentInfo& info, bool& stop) {
+ if ( strcmp(info.segName, "__LINKEDIT") == 0 )
+ linkeditSeg = (uint8_t*)libobjcMH + info.loadCommandOffset;
+ });
+ if ( linkeditSeg == nullptr ) {
+ diag.warning("__LINKEDIT not found in libojbc.dylib");
+ return;
+ }
+
+ // move load commands to make room to insert two new ones before LINKEDIT segment load command
+ uint8_t* endOfLoadCommands = (uint8_t*)libobjcMH + sizeof(macho_header<P>) + libobjcMH->sizeofcmds;
+ uint32_t remainingSize = (uint32_t)(endOfLoadCommands - linkeditSeg);
+ memmove(linkeditSeg+2*segSize, linkeditSeg, remainingSize);
+
+ // insert new segments
+ macho_segment_command<P>* roSeg = (macho_segment_command<P>*)(linkeditSeg);
+ macho_segment_command<P>* rwSeg = (macho_segment_command<P>*)(linkeditSeg+sizeof(macho_segment_command<P>));
+ roSeg->set_cmd(macho_segment_command<P>::CMD);
+ roSeg->set_cmdsize(segSize);
+ roSeg->set_segname("__OBJC_RO");
+ roSeg->set_vmaddr(cache->unslidLoadAddress() + objcReadOnlyBuffer - (uint8_t*)cache);
+ roSeg->set_vmsize(objcReadOnlyBufferSizeAllocated);
+ roSeg->set_fileoff(objcReadOnlyBuffer - (uint8_t*)cache);
+ roSeg->set_filesize(objcReadOnlyBufferSizeAllocated);
+ roSeg->set_maxprot(VM_PROT_READ);
+ roSeg->set_initprot(VM_PROT_READ);
+ roSeg->set_nsects(0);
+ roSeg->set_flags(0);
+ rwSeg->set_cmd(macho_segment_command<P>::CMD);
+ rwSeg->set_cmdsize(segSize);
+ rwSeg->set_segname("__OBJC_RW");
+ rwSeg->set_vmaddr(cache->unslidLoadAddress() + objcReadWriteBuffer - (uint8_t*)cache);
+ rwSeg->set_vmsize(objcReadWriteBufferSizeAllocated);
+ rwSeg->set_fileoff(objcRwFileOffset);
+ rwSeg->set_filesize(objcReadWriteBufferSizeAllocated);
+ rwSeg->set_maxprot(VM_PROT_WRITE|VM_PROT_READ);
+ rwSeg->set_initprot(VM_PROT_WRITE|VM_PROT_READ);
+ rwSeg->set_nsects(0);
+ rwSeg->set_flags(0);
+
+ // update mach_header to account for new load commands
+ macho_header<P>* mh = (macho_header<P>*)libobjcMH;
+ mh->set_sizeofcmds(mh->sizeofcmds() + 2*segSize);
+ mh->set_ncmds(mh->ncmds()+2);
+
+ // fix up table at start of dyld cache that has pointer into install name for libobjc
+ dyld_cache_image_info* images = (dyld_cache_image_info*)((uint8_t*)cache + cache->header.imagesOffset);
+ uint64_t libobjcUnslidAddress = cache->unslidLoadAddress() + ((uint8_t*)libobjcMH - (uint8_t*)cache);
+ for (uint32_t i=0; i < cache->header.imagesCount; ++i) {
+ if ( images[i].address == libobjcUnslidAddress ) {
+ images[i].pathFileOffset += (2*segSize);
+ break;
+ }
+ }
+}
+
+
+template <typename P>
+void doOptimizeObjC(DyldSharedCache* cache, bool forProduction, CacheBuilder::ASLR_Tracker& aslrTracker,
+ CacheBuilder::LOH_Tracker& lohTracker, const CacheBuilder::CacheCoalescedText& coalescedText,
+ const std::map<void*, std::string>& missingWeakImports, Diagnostics& diag,
+ uint8_t* objcReadOnlyBuffer, uint64_t objcReadOnlyBufferSizeUsed, uint64_t objcReadOnlyBufferSizeAllocated,
+ uint8_t* objcReadWriteBuffer, uint64_t objcReadWriteBufferSizeAllocated,
+ uint32_t objcRwFileOffset)
+{
+ typedef typename P::E E;
+ typedef typename P::uint_t pint_t;
+
+ diag.verbose("Optimizing objc metadata:\n");
+ diag.verbose(" cache type is %s\n", forProduction ? "production" : "development");
+
+ ContentAccessor cacheAccessor(cache, diag);
+
+ size_t headerSize = P::round_up(sizeof(objc_opt::objc_opt_t));
+ if (headerSize != sizeof(objc_opt::objc_opt_t)) {
+ diag.warning("libobjc's optimization structure size is wrong (metadata not optimized)");
+ }
+
+ //
+ // Find libobjc's empty sections and build list of images with objc metadata
+ //
+ __block const mach_header* libobjcMH = nullptr;
+ __block const macho_section<P> *optROSection = nullptr;
+ __block const macho_section<P> *optPointerListSection = nullptr;
+ __block std::vector<const macho_header<P>*> objcDylibs;
+ cache->forEachImage(^(const mach_header* machHeader, const char* installName) {
+ const macho_header<P>* mh = (const macho_header<P>*)machHeader;
+ if ( strstr(installName, "/libobjc.") != nullptr ) {
+ libobjcMH = (mach_header*)mh;
+ optROSection = mh->getSection("__TEXT", "__objc_opt_ro");
+ optPointerListSection = mh->getSection("__DATA", "__objc_opt_ptrs");
+ }
+ if ( mh->getSection("__DATA", "__objc_imageinfo") || mh->getSection("__OBJC", "__image_info") ) {
+ objcDylibs.push_back(mh);
+ }
+ // log("installName %s at mhdr 0x%016lx", installName, (uintptr_t)cacheAccessor.vmAddrForContent((void*)mh));
+ });
+ if ( optROSection == nullptr ) {
+ diag.warning("libobjc's read-only section missing (metadata not optimized)");
+ return;
+ }
+ if ( optPointerListSection == nullptr ) {
+ diag.warning("libobjc's pointer list section missing (metadata not optimized)");
+ return;
+ }
+ // point optROData into space allocated in dyld cache
+ uint8_t* optROData = objcReadOnlyBuffer + objcReadOnlyBufferSizeUsed;
+ size_t optRORemaining = objcReadOnlyBufferSizeAllocated - objcReadOnlyBufferSizeUsed;
+ *((uint32_t*)optROData) = objc_opt::VERSION;
+ if ( optROData == nullptr ) {
+ diag.warning("libobjc's read-only section has bad content");
+ return;
+ }
+
+ uint8_t* optRWData = objcReadWriteBuffer;
+ size_t optRWRemaining = objcReadWriteBufferSizeAllocated;
+ if (optRORemaining < headerSize) {
+ diag.warning("libobjc's read-only section is too small (metadata not optimized)");
+ return;
+ }
+ objc_opt::objc_opt_t* optROHeader = (objc_opt::objc_opt_t *)optROData;
+ optROData += headerSize;
+ optRORemaining -= headerSize;
+ if (E::get32(optROHeader->version) != objc_opt::VERSION) {
+ diag.warning("libobjc's read-only section version is unrecognized (metadata not optimized)");
+ return;
+ }
+
+ if (optPointerListSection->size() < sizeof(objc_opt::objc_opt_pointerlist_tt<pint_t>)) {
+ diag.warning("libobjc's pointer list section is too small (metadata not optimized)");
+ return;
+ }
+ const objc_opt::objc_opt_pointerlist_tt<pint_t> *optPointerList = (const objc_opt::objc_opt_pointerlist_tt<pint_t> *)cacheAccessor.contentForVMAddr(optPointerListSection->addr());
+
+ // Write nothing to optROHeader until everything else is written.
+ // If something fails below, libobjc will not use the section.
+
+
+ //
+ // Make copy of objcList and sort that list.
+ //
+ std::vector<const macho_header<P>*> addressSortedDylibs = objcDylibs;
+ std::sort(addressSortedDylibs.begin(), addressSortedDylibs.end(), [](const macho_header<P>* lmh, const macho_header<P>* rmh) -> bool {
+ return lmh < rmh;
+ });
+
+ //
+ // Build HeaderInfo list in cache
+ //
+ // First the RO header info
+ // log("writing out %d RO dylibs at offset %d", (uint32_t)objcDylibs.size(), (uint32_t)(optROSection->size() - optRORemaining));
+ uint64_t hinfoROVMAddr = cacheAccessor.vmAddrForContent(optROData);
+ HeaderInfoOptimizer<P, objc_header_info_ro_t<P>> hinfoROOptimizer;
+ const char* err = hinfoROOptimizer.init((uint32_t)objcDylibs.size(), optROData, optRORemaining);
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+ else {
+ for (const macho_header<P>* mh : addressSortedDylibs) {
+ hinfoROOptimizer.update(&cacheAccessor, mh, aslrTracker);
+ }
+ }
+
+ // Then the RW header info
+ // log("writing out %d RW dylibs at offset %d", (uint32_t)objcDylibs.size(), (uint32_t)(optRWSection->size() - optRWRemaining));
+ uint64_t hinfoRWVMAddr = cacheAccessor.vmAddrForContent(optRWData);
+ HeaderInfoOptimizer<P, objc_header_info_rw_t<P>> hinfoRWOptimizer;
+ err = hinfoRWOptimizer.init((uint32_t)objcDylibs.size(), optRWData, optRWRemaining);
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+ else {
+ for (const macho_header<P>* mh : addressSortedDylibs) {
+ hinfoRWOptimizer.update(&cacheAccessor, mh, aslrTracker);
+ }
+ }
+
+ //
+ // Update selector references and build selector list
+ //
+ // This is SAFE: if we run out of room for the selector table,
+ // the modified binaries are still usable.
+ //
+ // Heuristic: choose selectors from libraries with more selector cstring data first.
+ // This tries to localize selector cstring memory.
+ //
+ ObjCSelectorUniquer<P> uniq(&cacheAccessor);
+ std::vector<const macho_header<P>*> sizeSortedDylibs = objcDylibs;
+ std::sort(sizeSortedDylibs.begin(), sizeSortedDylibs.end(), [](const macho_header<P>* lmh, const macho_header<P>* rmh) -> bool {
+ // Sort a select few heavy hitters first.
+ auto getPriority = [](const char* installName) -> int {
+ if (!strcmp(installName, "/usr/lib/libobjc.A.dylib"))
+ return 0;
+ if (!strcmp(installName, "/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation") ||
+ !strcmp(installName, "/System/Library/Frameworks/Foundation.framework/Foundation"))
+ return 1;
+ if (!strcmp(installName, "/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation") ||
+ !strcmp(installName, "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation"))
+ return 2;
+ // Note we don't sort iOSMac UIKitCore early as we want iOSMac after macOS.
+ if (!strcmp(installName, "/System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore"))
+ return 3;
+ if (!strcmp(installName, "/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit"))
+ return 4;
+ if (!strcmp(installName, "/System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork") ||
+ !strcmp(installName, "/System/Library/Frameworks/CFNetwork.framework/CFNetwork"))
+ return 5;
+ return INT_MAX;
+ };
+
+ // Sort by priority first
+ int priorityA = getPriority(((const dyld3::MachOFile*)lmh)->installName());
+ int priorityB = getPriority(((const dyld3::MachOFile*)rmh)->installName());
+ if (priorityA != priorityB)
+ return priorityA < priorityB;
+
+ // Sort mac before iOSMac
+ bool isIOSMacA = strncmp(((const dyld3::MachOFile*)lmh)->installName(), "/System/iOSSupport/", 19) == 0;
+ bool isIOSMacB = strncmp(((const dyld3::MachOFile*)rmh)->installName(), "/System/iOSSupport/", 19) == 0;
+ if (isIOSMacA != isIOSMacB)
+ return !isIOSMacA;
+
+ const macho_section<P>* lSection = lmh->getSection("__TEXT", "__objc_methname");
+ const macho_section<P>* rSection = rmh->getSection("__TEXT", "__objc_methname");
+ uint64_t lSelectorSize = (lSection ? lSection->size() : 0);
+ uint64_t rSelectorSize = (rSection ? rSection->size() : 0);
+ return lSelectorSize > rSelectorSize;
+ });
+
+ auto alignPointer = [](uint8_t* ptr) -> uint8_t* {
+ return (uint8_t*)(((uintptr_t)ptr + 0x7) & ~0x7);
+ };
+
+ SelectorOptimizer<P, ObjCSelectorUniquer<P> > selOptimizer(uniq);
+ selOptimizer.visitCoalescedStrings(coalescedText);
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ LegacySelectorUpdater<P, ObjCSelectorUniquer<P>>::update(&cacheAccessor, mh, uniq);
+ selOptimizer.optimize(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" uniqued %6lu selectors\n", uniq.strings().size());
+ diag.verbose(" updated %6lu selector references\n", uniq.count());
+
+ uint64_t seloptVMAddr = cacheAccessor.vmAddrForContent(optROData);
+ objc_opt::objc_selopt_t *selopt = new(optROData) objc_opt::objc_selopt_t;
+ err = selopt->write(seloptVMAddr, optRORemaining, uniq.strings());
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+ optROData += selopt->size();
+ optROData = alignPointer(optROData);
+ optRORemaining -= selopt->size();
+ uint32_t seloptCapacity = selopt->capacity;
+ uint32_t seloptOccupied = selopt->occupied;
+ selopt->byteswap(E::little_endian), selopt = nullptr;
+
+ diag.verbose(" selector table occupancy %u/%u (%u%%)\n",
+ seloptOccupied, seloptCapacity,
+ (unsigned)(seloptOccupied/(double)seloptCapacity*100));
+
+
+ //
+ // Detect classes that have missing weak-import superclasses.
+ //
+ // Production shared caches don't support roots so we can set this and know
+ // there will definitely not be missing weak superclasses at runtime.
+ // Development shared caches can set this bit as the objc runtime only trusts
+ // this bit if there are no roots at runtime.
+ //
+ // This is SAFE: the binaries themselves are unmodified.
+ WeakClassDetector<P> weakopt;
+ bool noMissingWeakSuperclasses = weakopt.noMissingWeakSuperclasses(&cacheAccessor,
+ missingWeakImports,
+ sizeSortedDylibs);
+
+ if (forProduction) {
+ // Shared cache does not currently support unbound weak references.
+ // Here we assert that there are none. If support is added later then
+ // this assertion needs to be removed and this path needs to be tested.
+ // FIXME: The internal cache also isn't going to notice that an on-disk
+ // dylib could resolve a weak bind from the shared cache. Should we just
+ // error on all caches, regardless of dev/customer?
+ if (!noMissingWeakSuperclasses) {
+ diag.error("Some Objective-C class has a superclass that is "
+ "weak-import and missing from the cache.");
+ }
+ }
+
+
+ //
+ // Build class table.
+ //
+ // This is SAFE: the binaries themselves are unmodified.
+ ClassListBuilder<P> classes(hinfoROOptimizer);
+ ClassWalker<P, ClassListBuilder<P>> classWalker(classes);
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ classWalker.walk(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" recorded % 6ld classes\n", classes.classNames().size());
+
+ uint64_t clsoptVMAddr = cacheAccessor.vmAddrForContent(optROData);
+ objc_opt::objc_clsopt_t *clsopt = new(optROData) objc_opt::objc_clsopt_t;
+ err = clsopt->write(clsoptVMAddr, optRORemaining,
+ classes.classNames(), classes.classes(), false);
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+ optROData += clsopt->size();
+ optROData = alignPointer(optROData);
+ optRORemaining -= clsopt->size();
+ size_t duplicateCount = clsopt->duplicateCount();
+ uint32_t clsoptCapacity = clsopt->capacity;
+ uint32_t clsoptOccupied = clsopt->occupied;
+ clsopt->byteswap(E::little_endian);
+ clsopt = nullptr;
+
+ diag.verbose(" found % 6ld duplicate classes\n",
+ duplicateCount);
+ diag.verbose(" class table occupancy %u/%u (%u%%)\n",
+ clsoptOccupied, clsoptCapacity,
+ (unsigned)(clsoptOccupied/(double)clsoptCapacity*100));
+
+
+ //
+ // Sort method lists.
+ //
+ // This is SAFE: modified binaries are still usable as unsorted lists.
+ // This must be done AFTER uniquing selectors.
+ MethodListSorter<P> methodSorter;
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ methodSorter.optimize(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" sorted % 6ld method lists\n", methodSorter.optimized());
+
+
+ // Unique protocols and build protocol table.
+
+ // This is SAFE: no protocol references are updated yet
+ // This must be done AFTER updating method lists.
+
+ ProtocolOptimizer<P> protocolOptimizer(diag, hinfoROOptimizer);
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ protocolOptimizer.addProtocols(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" uniqued % 6ld protocols\n",
+ protocolOptimizer.protocolCount());
+
+ pint_t protocolClassVMAddr = (pint_t)P::getP(optPointerList->protocolClass);
+ err = protocolOptimizer.writeProtocols(&cacheAccessor,
+ optRWData, optRWRemaining,
+ optROData, optRORemaining,
+ aslrTracker, protocolClassVMAddr);
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+
+ // Align the buffer again. The new protocols may have added an odd number of name characters
+ optROData = alignPointer(optROData);
+
+ // New protocol table which tracks loaded images.
+ uint64_t protocoloptVMAddr = cacheAccessor.vmAddrForContent(optROData);
+ objc_opt::objc_protocolopt2_t *protocolopt = new (optROData) objc_opt::objc_protocolopt2_t;
+ err = protocolopt->write(protocoloptVMAddr, optRORemaining,
+ protocolOptimizer.protocolNames(),
+ protocolOptimizer.protocolsAndHeaders(), false);
+ if (err) {
+ diag.warning("%s", err);
+ return;
+ }
+ optROData += protocolopt->size();
+ optROData = alignPointer(optROData);
+ optRORemaining -= protocolopt->size();
+ uint32_t protocoloptCapacity = protocolopt->capacity;
+ uint32_t protocoloptOccupied = protocolopt->occupied;
+ protocolopt->byteswap(E::little_endian), protocolopt = NULL;
+
+ diag.verbose(" protocol table occupancy %u/%u (%u%%)\n",
+ protocoloptOccupied, protocoloptCapacity,
+ (unsigned)(protocoloptOccupied/(double)protocoloptCapacity*100));
+
+
+ // Redirect protocol references to the uniqued protocols.
+
+ // This is SAFE: the new protocol objects are still usable as-is.
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ protocolOptimizer.updateReferences(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" updated % 6ld protocol references\n", protocolOptimizer.protocolReferenceCount());
+
+
+ //
+ // Repair ivar offsets.
+ //
+ // This is SAFE: the runtime always validates ivar offsets at runtime.
+ IvarOffsetOptimizer<P> ivarOffsetOptimizer;
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ ivarOffsetOptimizer.optimize(&cacheAccessor, mh);
+ }
+
+ diag.verbose(" updated % 6ld ivar offsets\n", ivarOffsetOptimizer.optimized());
+
+
+ // Collect flags.
+ uint32_t headerFlags = 0;
+ if (forProduction) {
+ headerFlags |= objc_opt::IsProduction;
+ }
+ if (noMissingWeakSuperclasses) {
+ headerFlags |= objc_opt::NoMissingWeakSuperclasses;
+ }
+
+
+ // Success. Mark dylibs as optimized.
+ for (const macho_header<P>* mh : sizeSortedDylibs) {
+ const macho_section<P>* imageInfoSection = mh->getSection("__DATA", "__objc_imageinfo");
+ if (!imageInfoSection) {
+ imageInfoSection = mh->getSection("__OBJC", "__image_info");
+ }
+ if (imageInfoSection) {
+ objc_image_info<P>* info = (objc_image_info<P>*)cacheAccessor.contentForVMAddr(imageInfoSection->addr());
+ info->setOptimizedByDyld();
+ }
+ }
+
+
+ // Success. Update __objc_opt_ro section in libobjc.dylib to contain offsets to generated optimization structures
+ objc_opt::objc_opt_t* libROHeader = (objc_opt::objc_opt_t *)cacheAccessor.contentForVMAddr(optROSection->addr());
+ E::set32(libROHeader->flags, headerFlags);
+ E::set32(libROHeader->selopt_offset, (uint32_t)(seloptVMAddr - optROSection->addr()));
+ E::set32(libROHeader->clsopt_offset, (uint32_t)(clsoptVMAddr - optROSection->addr()));
+ E::set32(libROHeader->unused_protocolopt_offset, 0);
+ E::set32(libROHeader->headeropt_ro_offset, (uint32_t)(hinfoROVMAddr - optROSection->addr()));
+ E::set32(libROHeader->headeropt_rw_offset, (uint32_t)(hinfoRWVMAddr - optROSection->addr()));
+ E::set32(libROHeader->protocolopt_offset, (uint32_t)(protocoloptVMAddr - optROSection->addr()));
+
+ // Log statistics.
+ size_t roSize = objcReadOnlyBufferSizeAllocated - optRORemaining;
+ size_t rwSize = objcReadWriteBufferSizeAllocated - optRWRemaining;
+ diag.verbose(" %lu/%llu bytes (%d%%) used in shared cache read-only optimization region\n",
+ roSize, objcReadOnlyBufferSizeAllocated, percent(roSize, objcReadOnlyBufferSizeAllocated));
+ diag.verbose(" %lu/%llu bytes (%d%%) used in shared cache read/write optimization region\n",
+ rwSize, objcReadWriteBufferSizeAllocated, percent(rwSize, objcReadWriteBufferSizeAllocated));
+ diag.verbose(" wrote objc metadata optimization version %d\n", objc_opt::VERSION);
+
+ // Add segments to libobjc.dylib that cover cache builder allocated r/o and r/w regions
+ addObjcSegments<P>(diag, cache, libobjcMH, objcReadOnlyBuffer, objcReadOnlyBufferSizeAllocated, objcReadWriteBuffer, objcReadWriteBufferSizeAllocated, objcRwFileOffset);
+
+
+ // Now that objc has uniqued the selector references, we can apply the LOHs so that ADRP/LDR -> ADRP/ADD
+ if (forProduction) {
+ const bool logSelectors = false;
+ uint64_t lohADRPCount = 0;
+ uint64_t lohLDRCount = 0;
+
+ for (auto& targetAndInstructions : lohTracker) {
+ uint64_t targetVMAddr = targetAndInstructions.first;
+ if (!selOptimizer.isSelectorRefAddress((pint_t)targetVMAddr))
+ continue;
+
+ std::set<void*>& instructions = targetAndInstructions.second;
+ // We do 2 passes over the instructions. The first to validate them and the second
+ // to actually update them.
+ for (unsigned pass = 0; pass != 2; ++pass) {
+ uint32_t adrpCount = 0;
+ uint32_t ldrCount = 0;
+ for (void* instructionAddress : instructions) {
+ uint32_t& instruction = *(uint32_t*)instructionAddress;
+ uint64_t instructionVMAddr = cacheAccessor.vmAddrForContent(&instruction);
+ uint64_t selRefContent = *(uint64_t*)cacheAccessor.contentForVMAddr(targetVMAddr);
+ const char* selectorString = (const char*)cacheAccessor.contentForVMAddr(selRefContent);
+ uint64_t selectorStringVMAddr = cacheAccessor.vmAddrForContent(selectorString);
+
+ if ( (instruction & 0x9F000000) == 0x90000000 ) {
+ // ADRP
+ int64_t pageDistance = ((selectorStringVMAddr & ~0xFFF) - (instructionVMAddr & ~0xFFF));
+ int64_t newPage21 = pageDistance >> 12;
+
+ if (pass == 0) {
+ if ( (newPage21 > 2097151) || (newPage21 < -2097151) ) {
+ if (logSelectors)
+ fprintf(stderr, "Out of bounds ADRP selector reference target\n");
+ instructions.clear();
+ break;
+ }
+ ++adrpCount;
+ }
+
+ if (pass == 1) {
+ instruction = (instruction & 0x9F00001F) | ((newPage21 << 29) & 0x60000000) | ((newPage21 << 3) & 0x00FFFFE0);
+ ++lohADRPCount;
+ }
+ continue;
+ }
+
+ if ( (instruction & 0x3B000000) == 0x39000000 ) {
+ // LDR/STR. STR shouldn't be possible as this is a selref!
+ if (pass == 0) {
+ if ( (instruction & 0xC0C00000) != 0xC0400000 ) {
+ // Not a load, or dest reg isn't xN, or uses sign extension
+ if (logSelectors)
+ fprintf(stderr, "Bad LDR for selector reference optimisation\n");
+ instructions.clear();
+ break;
+ }
+ if ( (instruction & 0x04000000) != 0 ) {
+ // Loading a float
+ if (logSelectors)
+ fprintf(stderr, "Bad LDR for selector reference optimisation\n");
+ instructions.clear();
+ break;
+ }
+ ++ldrCount;
+ }
+
+ if (pass == 1) {
+ uint32_t ldrDestReg = (instruction & 0x1F);
+ uint32_t ldrBaseReg = ((instruction >> 5) & 0x1F);
+
+ // Convert the LDR to an ADD
+ instruction = 0x91000000;
+ instruction |= ldrDestReg;
+ instruction |= ldrBaseReg << 5;
+ instruction |= (selectorStringVMAddr & 0xFFF) << 10;
+
+ ++lohLDRCount;
+ }
+ continue;
+ }
+
+ if ( (instruction & 0xFFC00000) == 0x91000000 ) {
+ // ADD imm12
+ // We don't support ADDs.
+ if (logSelectors)
+ fprintf(stderr, "Bad ADD for selector reference optimisation\n");
+ instructions.clear();
+ break;
+ }
+
+ if (logSelectors)
+ fprintf(stderr, "Unknown instruction for selref optimisation\n");
+ instructions.clear();
+ break;
+ }
+ if (pass == 0) {
+ // If we didn't see at least one ADRP/LDR in pass one then don't optimize this location
+ if ((adrpCount == 0) || (ldrCount == 0)) {
+ instructions.clear();
+ break;
+ }
+ }
+ }
+ }
+
+ diag.verbose(" Optimized %lld ADRP LOHs\n", lohADRPCount);
+ diag.verbose(" Optimized %lld LDR LOHs\n", lohLDRCount);
+ }
+}
+
+
+} // anon namespace
+
+void CacheBuilder::optimizeObjC()
+{
+ uint32_t objcRwFileOffset = (uint32_t)((_objcReadWriteBuffer - _readWriteRegion.buffer) + _readWriteRegion.cacheFileOffset);
+ if ( _archLayout->is64 )
+ doOptimizeObjC<Pointer64<LittleEndian>>((DyldSharedCache*)_readExecuteRegion.buffer, _options.optimizeStubs, _aslrTracker, _lohTracker,
+ _coalescedText, _missingWeakImports,
+ _diagnostics, _objcReadOnlyBuffer, _objcReadOnlyBufferSizeUsed, _objcReadOnlyBufferSizeAllocated,
+ _objcReadWriteBuffer, _objcReadWriteBufferSizeAllocated, objcRwFileOffset);
+ else
+ doOptimizeObjC<Pointer32<LittleEndian>>((DyldSharedCache*)_readExecuteRegion.buffer, _options.optimizeStubs, _aslrTracker, _lohTracker,
+ _coalescedText, _missingWeakImports,
+ _diagnostics, _objcReadOnlyBuffer, _objcReadOnlyBufferSizeUsed, _objcReadOnlyBufferSizeAllocated,
+ _objcReadWriteBuffer, _objcReadWriteBufferSizeAllocated, objcRwFileOffset);
+}
+
+static uint32_t hashTableSize(uint32_t maxElements, uint32_t perElementData)
+{
+ uint32_t elementsWithPadding = maxElements*11/10; // if close to power of 2, perfect hash may fail, so don't get within 10% of that
+ uint32_t powTwoCapacity = 1 << (32 - __builtin_clz(elementsWithPadding - 1));
+ uint32_t headerSize = 4*(8+256);
+ return headerSize + powTwoCapacity/2 + powTwoCapacity + powTwoCapacity*perElementData;
+}
+
+// The goal here is to allocate space in the dyld shared cache (while it is being laid out) that will contain
+// the objc structures that previously were in the __objc_opt_ro section.
+uint32_t CacheBuilder::computeReadOnlyObjC(uint32_t selRefCount, uint32_t classDefCount, uint32_t protocolDefCount)
+{
+ return 0xA000 + hashTableSize(selRefCount, 5) + hashTableSize(classDefCount, 12) + hashTableSize(protocolDefCount, 8);
+}
+
+// Space to replace the __objc_opt_rw section.
+uint32_t CacheBuilder::computeReadWriteObjC(uint32_t imageCount, uint32_t protocolDefCount)
+{
+ return 8*imageCount + protocolDefCount*12*(_archLayout->is64 ? 8 : 4);
+}