Loading...
--- dyld/dyld-360.19/launch-cache/update_dyld_shared_cache.cpp
+++ /dev/null
@@ -1,4033 +0,0 @@
-/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
- *
- * Copyright (c) 2006-2011 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 <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <mach/mach.h>
-#include <mach/mach_time.h>
-#include <limits.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <fcntl.h>
-#include <dlfcn.h>
-#include <signal.h>
-#include <errno.h>
-#include <sys/uio.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <sys/param.h>
-#include <sys/sysctl.h>
-#include <sys/resource.h>
-#include <dirent.h>
-#include <servers/bootstrap.h>
-#include <mach-o/loader.h>
-#include <mach-o/fat.h>
-#include <CoreFoundation/CoreFoundation.h>
-#include <Security/Security.h>
-#include <Security/SecCodeSigner.h>
-#include <CommonCrypto/CommonDigest.h>
-
-#include "dyld_cache_format.h"
-
-#include <vector>
-#include <set>
-#include <map>
-#include <unordered_map>
-
-#include "Architectures.hpp"
-#include "MachOLayout.hpp"
-#include "MachORebaser.hpp"
-#include "MachOBinder.hpp"
-#include "CacheFileAbstraction.hpp"
-#include "dyld_cache_config.h"
-
-#define SELOPT_WRITE
-#include "objc-shared-cache.h"
-
-#define FIRST_DYLIB_TEXT_OFFSET 0x10000
-
-#ifndef LC_FUNCTION_STARTS
- #define LC_FUNCTION_STARTS 0x26
-#endif
-
-static bool verbose = false;
-static bool progress = false;
-static bool iPhoneOS = false;
-static bool rootless = true;
-static std::vector<const char*> warnings;
-
-
-static void warn(const char *arch, const char *format, ...)
-{
- char *msg;
-
- va_list args;
- va_start(args, format);
- ::vasprintf(&msg, format, args);
- va_end(args);
-
- warnings.push_back(msg);
-
- if ( verbose ) {
- ::fprintf(::stderr, "update_dyld_shared_cache: warning: %s%s%s%s\n",
- arch ? "for arch " : "",
- arch ? arch : "",
- arch ? ", " : "",
- msg);
- }
-}
-
-
-class CStringHash {
-public:
- size_t operator()(const char* __s) const {
- size_t __h = 0;
- for ( ; *__s; ++__s)
- __h = 5 * __h + *__s;
- return __h;
- };
-};
-class CStringEquals
-{
-public:
- bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
-};
-
-
-
-class ArchGraph
-{
-public:
- typedef std::unordered_map<const char*, const char*, CStringHash, CStringEquals> StringToString;
-
- static void addArchPair(ArchPair ap);
- static void addRoot(const char* vpath, const std::set<ArchPair>& archs);
- static uint64_t maxCacheSizeForArchPair(ArchPair ap);
- static void findSharedDylibs(ArchPair ap);
- static ArchGraph* graphForArchPair(ArchPair ap) { return fgPerArchGraph[ap]; }
- static void setFileSystemRoot(const char* root) { fgFileSystemRoot = root; }
- static void setFileSystemOverlay(const std::vector<const char*>& overlays);
- static const char* archName(ArchPair ap);
-
- ArchPair getArchPair() { return fArchPair; }
- std::set<const class MachOLayoutAbstraction*>& getSharedDylibs() { return fSharedDylibs; }
- StringToString& getDylibAliases() { return fAliasesMap; }
- const char* archName() { return archName(fArchPair); }
-
-private:
-
- class DependencyNode
- {
- public:
- DependencyNode(ArchGraph*, const char* path, const MachOLayoutAbstraction* layout);
- void loadDependencies(const MachOLayoutAbstraction*);
- void markNeededByRoot(DependencyNode*);
- const char* getPath() const { return fPath; }
- const MachOLayoutAbstraction* getLayout() const { return fLayout; }
- size_t useCount() const { return fRootsDependentOnThis.size(); }
- bool allDependentsFound() const { return !fDependentMissing; }
- bool dependsOnDylibList() const { return fRootsDependentOnThis.count(const_cast<DependencyNode*>(this)); }
-
- private:
- ArchGraph* fGraph;
- const char* fPath;
- const MachOLayoutAbstraction* fLayout;
- bool fDependenciesLoaded;
- bool fDependentMissing;
- std::set<DependencyNode*> fDependsOn;
- std::set<DependencyNode*> fRootsDependentOnThis;
- };
-
- typedef std::unordered_map<const char*, class DependencyNode*, CStringHash, CStringEquals> PathToNode;
-
-
- ArchGraph(ArchPair ap) : fArchPair(ap) {}
- void addRoot(const char* path, const MachOLayoutAbstraction*);
- DependencyNode* getNode(const char* path);
- DependencyNode* getNodeForVirtualPath(const char* vpath);
- static bool canBeShared(const MachOLayoutAbstraction* layout, ArchPair ap, const std::set<const MachOLayoutAbstraction*>& possibleLibs, std::map<const MachOLayoutAbstraction*, bool>& shareableMap);
- static bool sharable(const MachOLayoutAbstraction* layout, ArchPair ap, char** msg);
-
- static std::map<ArchPair, ArchGraph*> fgPerArchGraph;
- static const char* fgFileSystemRoot;
- static std::vector<const char*> fgFileSystemOverlays;
-
- ArchPair fArchPair;
- std::set<DependencyNode*> fRoots;
- PathToNode fNodes;
- std::set<const MachOLayoutAbstraction*> fSharedDylibs; // use set to avoid duplicates when installname!=realpath
- StringToString fAliasesMap;
-};
-std::map<ArchPair, ArchGraph*> ArchGraph::fgPerArchGraph;
-const char* ArchGraph::fgFileSystemRoot = "";
-std::vector<const char*> ArchGraph::fgFileSystemOverlays;
-
-void ArchGraph::addArchPair(ArchPair ap)
-{
- //fprintf(stderr, "adding ArchPair 0x%08X,0x%08X\n", ap.arch, ap.subtype);
- fgPerArchGraph[ap] = new ArchGraph(ap);
-}
-
-void ArchGraph::setFileSystemOverlay(const std::vector<const char*>& overlays)
-{
- for (std::vector<const char*>::const_iterator it=overlays.begin(); it != overlays.end(); ++it)
- fgFileSystemOverlays.push_back(*it);
-}
-
-void ArchGraph::addRoot(const char* vpath, const std::set<ArchPair>& onlyArchs)
-{
- //fprintf(stderr, "addRoot(%s)\n", vpath);
- char completePath[MAXPATHLEN];
- const char* path = NULL;
- // check -overlay path first
- for (std::vector<const char*>::const_iterator it=fgFileSystemOverlays.begin(); it != fgFileSystemOverlays.end(); ++it) {
- strcpy(completePath, *it);
- strcat(completePath, vpath); // assumes vpath starts with '/'
- struct stat stat_buf;
- if ( stat(completePath, &stat_buf) == 0 ) {
- path = completePath;
- break;
- }
- }
- // if not found in overlay, check for -root
- if ( (path == NULL) && (fgFileSystemRoot[0] != '\0') ) {
- strcpy(completePath, fgFileSystemRoot);
- strcat(completePath, vpath); // assumes vpath starts with '/'
- struct stat stat_buf;
- if ( stat(completePath, &stat_buf) == 0 )
- path = completePath;
- }
- if ( path == NULL )
- path = vpath;
-
- try {
- //fprintf(stderr, " UniversalMachOLayout::find(%s)\n", path);
- const UniversalMachOLayout& uni = UniversalMachOLayout::find(path, &onlyArchs);
- for(std::set<ArchPair>::iterator ait = onlyArchs.begin(); ait != onlyArchs.end(); ++ait) {
- try {
- const MachOLayoutAbstraction* layout = uni.getSlice(*ait);
- if ( layout != NULL )
- fgPerArchGraph[*ait]->addRoot(path, layout);
- }
- catch (const char* msg) {
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: warning for %s can't use root '%s': %s\n", fgPerArchGraph[*ait]->archName(), path, msg);
- }
-
- }
- }
- catch (const char* msg) {
- fprintf(stderr, "update_dyld_shared_cache: warning can't use root '%s': %s\n", path, msg);
- }
-}
-
-
-
-void ArchGraph::addRoot(const char* path, const MachOLayoutAbstraction* layout)
-{
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: adding root: %s\n", path);
- DependencyNode* node = this->getNode(path);
- fRoots.insert(node);
- const MachOLayoutAbstraction* mainExecutableLayout = NULL;
- if ( layout->getFileType() == MH_EXECUTE )
- mainExecutableLayout = layout;
- node->loadDependencies(mainExecutableLayout);
- node->markNeededByRoot(node);
- if ( layout->getFileType() == MH_DYLIB )
- node->markNeededByRoot(NULL);
-}
-
-// a virtual path does not have the fgFileSystemRoot prefix
-ArchGraph::DependencyNode* ArchGraph::getNodeForVirtualPath(const char* vpath)
-{
- //fprintf(stderr, "getNodeForVirtualPath(%s)\n", vpath);
- char completePath[MAXPATHLEN];
- for (std::vector<const char*>::const_iterator it=fgFileSystemOverlays.begin(); it != fgFileSystemOverlays.end(); ++it) {
- const char* overlayPath = *it;
- // using -overlay means if /overlay/path/dylib exists use it, otherwise use /path/dylib
- strcpy(completePath, overlayPath);
- strcat(completePath, vpath); // assumes vpath starts with '/'
- struct stat stat_buf;
- if ( stat(completePath, &stat_buf) == 0 ) {
- return this->getNode(completePath);
- }
- // <rdar://problem/9279770> support when install name is a symlink
- const char* pathToSymlink = vpath;
- if ( fgFileSystemRoot[0] != '\0' ) {
- strcpy(completePath, fgFileSystemRoot);
- strcat(completePath, vpath);
- pathToSymlink = completePath;
- }
- if ( (lstat(pathToSymlink, &stat_buf) == 0) && S_ISLNK(stat_buf.st_mode) ) {
- // requested path did not exist in /overlay, but leaf of path is a symlink in /
- char pathInSymLink[MAXPATHLEN];
- size_t res = readlink(pathToSymlink, pathInSymLink, sizeof(pathInSymLink));
- if ( res != -1 ) {
- pathInSymLink[res] = '\0';
- if ( pathInSymLink[0] != '/' ) {
- char symFullPath[MAXPATHLEN];
- strcpy(symFullPath, vpath);
- char* lastSlash = strrchr(symFullPath, '/');
- if ( lastSlash != NULL ) {
- strcpy(lastSlash+1, pathInSymLink);
- // (re)try looking for what symlink points to, but in /overlay
- return this->getNodeForVirtualPath(symFullPath);
- }
- }
- }
- }
- }
-
- if ( fgFileSystemRoot[0] != '\0' ) {
- // using -root means always use /rootpath/usr/lib
- strcpy(completePath, fgFileSystemRoot);
- strcat(completePath, vpath); // assumes vpath starts with '/'
- return this->getNode(completePath);
- }
- // not found in -overlay or -root not used
- return this->getNode(vpath);
-}
-
-ArchGraph::DependencyNode* ArchGraph::getNode(const char* path)
-{
- //fprintf(stderr, "getNode(%s)\n", path);
- // look up supplied path to see if node already exists
- PathToNode::iterator pos = fNodes.find(path);
- if ( pos != fNodes.end() )
- return pos->second;
-
- // get real path
- char realPath[MAXPATHLEN];
- if ( realpath(path, realPath) == NULL )
- throwf("realpath() failed on %s\n", path);
-
- // look up real path to see if node already exists
- pos = fNodes.find(realPath);
- if ( pos != fNodes.end() ) {
- // update fAliasesMap with symlinks found
- const char* aliasPath = path;
- if ( (fgFileSystemRoot != NULL) && (strncmp(path, fgFileSystemRoot, strlen(fgFileSystemRoot)) == 0) ) {
- aliasPath = &path[strlen(fgFileSystemRoot)];
- }
- if ( fAliasesMap.find(aliasPath) == fAliasesMap.end() ) {
- if ( strcmp(aliasPath, pos->second->getLayout()->getID().name) != 0 ) {
- fAliasesMap[strdup(aliasPath)] = pos->second->getLayout()->getID().name;
- //fprintf(stderr, "getNode() %s: added alias %s -> %s\n", archName(fArchPair), aliasPath, fAliasesMap[aliasPath]);
- }
- }
- return pos->second;
- }
-
- // still does not exist, so create a new node
- const UniversalMachOLayout& uni = UniversalMachOLayout::find(realPath);
- DependencyNode* node = new DependencyNode(this, realPath, uni.getSlice(fArchPair));
- if ( node->getLayout() == NULL ) {
- throwf("%s is missing arch %s", realPath, archName(fArchPair));
- }
- // add realpath to node map
- fNodes[node->getPath()] = node;
- // if install name is not real path, add install name to node map
- if ( (node->getLayout()->getFileType() == MH_DYLIB) && (strcmp(realPath, node->getLayout()->getID().name) != 0) ) {
- //fprintf(stderr, "adding %s node alias %s for %s\n", archName(fArchPair), node->getLayout()->getID().name, realPath);
- pos = fNodes.find(node->getLayout()->getID().name);
- if ( pos != fNodes.end() ) {
- // get uuids of two dylibs to see if this is accidental copy of a dylib or two differnent dylibs with same -install_name
- uuid_t uuid1;
- uuid_t uuid2;
- node->getLayout()->uuid(uuid1);
- pos->second->getLayout()->uuid(uuid2);
- if ( memcmp(&uuid1, &uuid2, 16) == 0 ) {
- // <rdar://problem/8305479> warn if two dylib in cache have same install_name
- char* msg;
- asprintf(&msg, "update_dyld_shared_cache: warning, found two copies of the same dylib with same install path: %s\n\t%s\n\t%s\n",
- node->getLayout()->getID().name, pos->second->getPath(), node->getPath());
- fprintf(stderr, "%s", msg);
- warnings.push_back(msg);
- }
- else {
- // <rdar://problem/12763450> update_dyld_shared_cache should fail if two images have same install name
- fprintf(stderr, "update_dyld_shared_cache: found two different dylibs with same install path: %s\n\t%s\n\t%s\n",
- node->getLayout()->getID().name, pos->second->getPath(), node->getPath());
- exit(1);
- }
- }
- else
- fNodes[node->getLayout()->getID().name] = node;
- // update fAliasesMap with symlinks found
- const char* aliasPath = realPath;
- if ( (fgFileSystemRoot != NULL) && (fgFileSystemRoot[0] != '\0') && (strncmp(realPath, fgFileSystemRoot, strlen(fgFileSystemRoot)) == 0) ) {
- aliasPath = &realPath[strlen(fgFileSystemRoot)];
- }
- // <rdar://problem/11192810> Too many aliases in -overlay mode
- for (std::vector<const char*>::const_iterator it=fgFileSystemOverlays.begin(); it != fgFileSystemOverlays.end(); ++it) {
- const char* overlayPath = *it;
- if ( strncmp(realPath, overlayPath, strlen(overlayPath)) == 0 ) {
- aliasPath = &realPath[strlen(overlayPath)];
- break;
- }
- }
- if ( fAliasesMap.find(aliasPath) == fAliasesMap.end() ) {
- if ( strcmp(aliasPath, node->getLayout()->getID().name) != 0 ) {
- fAliasesMap[strdup(aliasPath)] = node->getLayout()->getID().name;
- //fprintf(stderr, "getNode() %s: added alias %s -> %s\n", archName(fArchPair), aliasPath, fAliasesMap[aliasPath]);
- }
- }
- }
- return node;
-}
-
-
-void ArchGraph::DependencyNode::loadDependencies(const MachOLayoutAbstraction* mainExecutableLayout)
-{
- if ( !fDependenciesLoaded ) {
- fDependenciesLoaded = true;
- // add dependencies
- const std::vector<MachOLayoutAbstraction::Library>& dependsOn = fLayout->getLibraries();
- for(std::vector<MachOLayoutAbstraction::Library>::const_iterator it = dependsOn.begin(); it != dependsOn.end(); ++it) {
- try {
- const char* dependentPath = it->name;
- if ( strncmp(dependentPath, "@executable_path/", 17) == 0 ) {
- if ( mainExecutableLayout == NULL )
- throw "@executable_path without main executable";
- // expand @executable_path path prefix
- const char* executablePath = mainExecutableLayout->getFilePath();
- char newPath[strlen(executablePath) + strlen(dependentPath)+2];
- if ( (fgFileSystemRoot != NULL) && (strncmp(executablePath, fgFileSystemRoot, strlen(fgFileSystemRoot)) == 0) ) {
- // executablePath already has rootPath prefix, need to remove that to get to base virtual path
- strcpy(newPath, &executablePath[strlen(fgFileSystemRoot)]);
- }
- else {
- strcpy(newPath, executablePath);
- }
- char* addPoint = strrchr(newPath,'/');
- if ( addPoint != NULL )
- strcpy(&addPoint[1], &dependentPath[17]);
- else
- strcpy(newPath, &dependentPath[17]);
- dependentPath = strdup(newPath);
- }
- else if ( strncmp(dependentPath, "@loader_path/", 13) == 0 ) {
- // expand @loader_path path prefix
- char newPath[strlen(fPath) + strlen(dependentPath)+2];
- if ( (fgFileSystemRoot != NULL) && (strncmp(fPath, fgFileSystemRoot, strlen(fgFileSystemRoot)) == 0) ) {
- // fPath already has rootPath prefix, need to remove that to get to base virtual path
- strcpy(newPath, &fPath[strlen(fgFileSystemRoot)]);
- }
- else {
- strcpy(newPath, fPath);
- }
- char* addPoint = strrchr(newPath,'/');
- if ( addPoint != NULL )
- strcpy(&addPoint[1], &dependentPath[13]);
- else
- strcpy(newPath, &dependentPath[13]);
- dependentPath = strdup(newPath);
- }
- else if ( strncmp(dependentPath, "@rpath/", 7) == 0 ) {
- throw "@rpath not supported in dyld shared cache";
- }
- // <rdar://problem/9161945> silently ignore dependents from main executables that can't be in shared cache
- bool addDependent = true;
- if ( fLayout->getFileType() == MH_EXECUTE ) {
- if ( (strncmp(dependentPath, "/usr/lib/", 9) != 0) && (strncmp(dependentPath, "/System/Library/", 16) != 0) ) {
- addDependent = false;
- }
- }
- if ( addDependent )
- fDependsOn.insert(fGraph->getNodeForVirtualPath(dependentPath));
- }
- catch (const char* msg) {
- if ( it->weakImport || ! fLayout->hasSplitSegInfo() ) {
- // ok to ignore missing weak imported dylibs from things that are
- // not going to be in the dyld shared cache
- }
- else {
- fprintf(stderr, "warning, could not bind %s because %s\n", fPath, msg);
- fDependentMissing = true;
- }
- }
- }
- // recurse
- for(std::set<DependencyNode*>::iterator it = fDependsOn.begin(); it != fDependsOn.end(); ++it) {
- (*it)->loadDependencies(mainExecutableLayout);
- }
- }
-}
-
-void ArchGraph::DependencyNode::markNeededByRoot(ArchGraph::DependencyNode* rootNode)
-{
- if ( fRootsDependentOnThis.count(rootNode) == 0 ) {
- fRootsDependentOnThis.insert(rootNode);
- for(std::set<DependencyNode*>::iterator it = fDependsOn.begin(); it != fDependsOn.end(); ++it) {
- (*it)->markNeededByRoot(rootNode);
- }
- }
-}
-
-
-
-ArchGraph::DependencyNode::DependencyNode(ArchGraph* graph, const char* path, const MachOLayoutAbstraction* layout)
- : fGraph(graph), fPath(strdup(path)), fLayout(layout), fDependenciesLoaded(false), fDependentMissing(false)
-{
- //fprintf(stderr, "new DependencyNode(0x%08X, %s)\n", graph->fArch, path);
-}
-
-uint64_t ArchGraph::maxCacheSizeForArchPair(ArchPair ap) {
- switch ( ap.arch ) {
- case CPU_TYPE_I386:
- return 0x20000000;
- case CPU_TYPE_X86_64:
- return 0x40000000;
- case CPU_TYPE_ARM:
- return ARM_SHARED_REGION_SIZE;
- case CPU_TYPE_ARM64:
- return ARM64_SHARED_REGION_SIZE;
- default: return UINT64_MAX;
- }
-}
-
-void ArchGraph::findSharedDylibs(ArchPair ap)
-{
- const PathToNode& nodes = fgPerArchGraph[ap]->fNodes;
- std::set<const MachOLayoutAbstraction*> possibleLibs;
- std::map<const MachOLayoutAbstraction*, const DependencyNode *> layoutToNode;
- //fprintf(stderr, "shared for arch %s\n", archName(ap));
- for(PathToNode::const_iterator it = nodes.begin(); it != nodes.end(); ++it) {
- DependencyNode* node = it->second;
- // <rdar://problem/6127437> put all dylibs in shared cache - not just ones used by more than one app
- if ( node->allDependentsFound() /*&& (node->useCount() > 1)*/ ) {
- const MachOLayoutAbstraction* layout = node->getLayout();
- if ( layout->isDylib() ) {
- char* msg;
- if ( sharable(layout, ap, &msg) ) {
- possibleLibs.insert(layout);
- layoutToNode[layout] = node;
- }
- else {
- if ( !iPhoneOS && (layout->getID().name[0] == '@') ) {
- // <rdar://problem/7770139> update_dyld_shared_cache should suppress warnings for embedded frameworks
- }
- else {
- warnings.push_back(msg);
- fprintf(stderr, "update_dyld_shared_cache: for arch %s, %s\n", archName(ap), msg);
- }
- }
- }
- }
- }
-
- // prune so that all shareable libs depend only on other shareable libs
- std::set<const MachOLayoutAbstraction*>& sharedLibs = fgPerArchGraph[ap]->fSharedDylibs;
- std::map<const MachOLayoutAbstraction*,bool> shareableMap;
- uint64_t totalLibSize = 0;
- for (std::set<const MachOLayoutAbstraction*>::iterator lit = possibleLibs.begin(); lit != possibleLibs.end(); ++lit) {
- if ( canBeShared(*lit, ap, possibleLibs, shareableMap) ) {
- totalLibSize += (*lit)->getVMSize();
- sharedLibs.insert(*lit);
- }
- }
-
-#if 0 // disable auto-eviction because it happens before linkedit optimization which means it is overly conservative.
-
- // Check to see if the unoptimized cache size is too large, if so trim out some libraries
- uint64_t maxCacheSize = maxCacheSizeForArchPair(ap);
- if (totalLibSize > maxCacheSize) {
- fprintf(stderr, "update_dyld_shared_cache: unoptimized %s shared cache overflow, total VM space: %lldMB (max=%lldMB)\n", archName(ap), totalLibSize/(1024*1024), maxCacheSize/(1024*1024));
- std::vector<const MachOLayoutAbstraction*> removableLibs;
-
- for (const MachOLayoutAbstraction* layout : sharedLibs) {
- // Every library uses itself, and every MH_DYLIB has an extra useCount, so we know useCount of 2 implies nothing else in the shared cache uses it
- if (layoutToNode[layout]->useCount() == 2) {
- if ( layoutToNode[layout]->dependsOnDylibList() ) {
- removableLibs.push_back(layout);
- //fprintf(stderr, " possible to evict: %s\n", layout->getID().name);
- }
- }
- }
-
- std::sort(removableLibs.begin(), removableLibs.end(), [](const MachOLayoutAbstraction* a, const MachOLayoutAbstraction* b){
- return a->getVMSize() < b->getVMSize();
- });
-
- while ( (totalLibSize > maxCacheSize) && !removableLibs.empty() ) {
- const MachOLayoutAbstraction* largestRemovableLib = removableLibs.back();
- removableLibs.pop_back();
- if ( largestRemovableLib->getVMSize() > 1024*1024 )
- fprintf(stderr, "update_dyld_shared_cache: evicting % 3lldMB leaf dylib %s\n", largestRemovableLib->getVMSize()/(1024*1024), largestRemovableLib->getID().name);
- else
- fprintf(stderr, "update_dyld_shared_cache: evicting % 3lldKB leaf dylib %s\n", largestRemovableLib->getVMSize()/1024, largestRemovableLib->getID().name);
- sharedLibs.erase(largestRemovableLib);
- totalLibSize -= largestRemovableLib->getVMSize();
- }
- fprintf(stderr, "update_dyld_shared_cache: unoptimized %s shared cache reduced to total VM space: %lldMB\n", archName(ap), totalLibSize/1024/1024);
- }
-#endif
-}
-
-const char* ArchGraph::archName(ArchPair ap)
-{
- switch ( ap.arch ) {
- case CPU_TYPE_I386:
- return "i386";
- case CPU_TYPE_X86_64:
- switch ( ap.subtype ) {
- case CPU_SUBTYPE_X86_64_H:
- return "x86_64h";
- default:
- return "x86_64";
- }
- case CPU_TYPE_ARM:
- switch ( ap.subtype ) {
- case CPU_SUBTYPE_ARM_V4T:
- return "armv4t";
- case CPU_SUBTYPE_ARM_V6:
- return "armv6";
- case CPU_SUBTYPE_ARM_V5TEJ:
- return "armv5";
- case CPU_SUBTYPE_ARM_XSCALE:
- return "arm-xscale";
- case CPU_SUBTYPE_ARM_V7:
- return "armv7";
- case CPU_SUBTYPE_ARM_V7F:
- return "armv7f";
- case CPU_SUBTYPE_ARM_V7K:
- return "armv7k";
- case CPU_SUBTYPE_ARM_V7S:
- return "armv7s";
- default:
- return "arm";
- }
- case CPU_TYPE_ARM64:
- return "arm64";
- default:
- return "unknown";
- }
-}
-
-bool ArchGraph::sharable(const MachOLayoutAbstraction* layout, ArchPair ap, char** msg)
-{
- int trustErr = layout->notTrusted();
- if ( ! layout->isTwoLevelNamespace() )
- asprintf(msg, "can't put %s in shared cache because it was built -flat_namespace", layout->getID().name);
- else if ( ! layout->inSharableLocation() )
- asprintf(msg, "can't put %s in shared cache because its -install_name is not in /usr/lib or /System/Library", layout->getID().name);
- else if ( ! layout->hasSplitSegInfo() )
- asprintf(msg, "can't put %s in shared cache because it was not built for %s or later", layout->getID().name, (iPhoneOS ? "iPhoneOS 3.1" : "MacOSX 10.5"));
- else if ( rootless == true && trustErr != 0 )
- asprintf(msg, "can't put %s in shared cache because it is not trusted: %s", layout->getFilePath(), strerror(trustErr));
- else if ( layout->hasDynamicLookupLinkage() )
- asprintf(msg, "can't put %s in shared cache because it was built with '-undefined dynamic_lookup'", layout->getID().name);
- else if ( layout->hasMainExecutableLookupLinkage() )
- asprintf(msg, "can't put %s in shared cache because it was built with '-bundle_loader'", layout->getID().name);
- else
- return true;
- return false;
-}
-
-bool ArchGraph::canBeShared(const MachOLayoutAbstraction* layout, ArchPair ap, const std::set<const MachOLayoutAbstraction*>& possibleLibs, std::map<const MachOLayoutAbstraction*, bool>& shareableMap)
-{
- // check map which is a cache of results
- std::map<const MachOLayoutAbstraction*, bool>::iterator mapPos = shareableMap.find(layout);
- if ( mapPos != shareableMap.end() ) {
- return mapPos->second;
- }
- // see if possible
- if ( possibleLibs.count(layout) == 0 ) {
- shareableMap[layout] = false;
- char* msg;
- if ( sharable(layout, ap, &msg) )
- asprintf(&msg, "can't put %s in shared cache, unknown reason", layout->getID().name);
- warnings.push_back(msg);
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: for arch %s, %s\n", archName(ap), msg);
- return false;
- }
- // look recursively
- shareableMap[layout] = true; // mark this shareable early in case of circular references
- const PathToNode& nodes = fgPerArchGraph[ap]->fNodes;
- const std::vector<MachOLayoutAbstraction::Library>& dependents = layout->getLibraries();
- for (std::vector<MachOLayoutAbstraction::Library>::const_iterator dit = dependents.begin(); dit != dependents.end(); ++dit) {
- PathToNode::const_iterator pos = nodes.find(dit->name);
- if ( pos == nodes.end() ) {
- // path from load command does not match any loaded dylibs, maybe there is a temp symlink
- char realPath[MAXPATHLEN];
- if ( realpath(dit->name, realPath) != NULL ) {
- if ( nodes.find(realPath) != nodes.end() )
- continue;
- }
- // handle weak imported dylibs not found
- if ( dit->weakImport )
- continue;
- shareableMap[layout] = false;
- char* msg;
- asprintf(&msg, "can't put %s in shared cache because it depends on %s which can't be found", layout->getID().name, dit->name);
- warnings.push_back(msg);
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: for arch %s, %s\n", archName(ap), msg);
- return false;
- }
- else {
- if ( ! canBeShared(pos->second->getLayout(), ap, possibleLibs, shareableMap) ) {
- shareableMap[layout] = false;
- char* msg;
- asprintf(&msg, "can't put %s in shared cache because it depends on %s which can't be in shared cache", layout->getID().name, dit->name);
- warnings.push_back(msg);
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: for arch %s, %s\n", archName(ap), msg);
- return false;
- }
- }
- }
- return true;
-}
-
-
-
-class StringPool
-{
-public:
- StringPool();
- const char* getBuffer();
- uint32_t size();
- uint32_t add(const char* str);
- uint32_t addUnique(const char* str);
- const char* stringAtIndex(uint32_t) const;
-
-private:
- typedef std::unordered_map<const char*, uint32_t, CStringHash, CStringEquals> StringToOffset;
-
- char* fBuffer;
- uint32_t fBufferAllocated;
- uint32_t fBufferUsed;
- StringToOffset fUniqueStrings;
-};
-
-
-StringPool::StringPool()
- : fBufferUsed(0), fBufferAllocated(128*1024*1024)
-{
- fBuffer = (char*)malloc(fBufferAllocated);
-}
-
-uint32_t StringPool::add(const char* str)
-{
- uint32_t len = strlen(str);
- if ( (fBufferUsed + len + 1) > fBufferAllocated ) {
- // grow buffer
- throw "string buffer exhausted";
- }
- strcpy(&fBuffer[fBufferUsed], str);
- uint32_t result = fBufferUsed;
- fUniqueStrings[&fBuffer[fBufferUsed]] = result;
- fBufferUsed += len+1;
- return result;
-}
-
-uint32_t StringPool::addUnique(const char* str)
-{
- StringToOffset::iterator pos = fUniqueStrings.find(str);
- if ( pos != fUniqueStrings.end() )
- return pos->second;
- else {
- //fprintf(stderr, "StringPool::addUnique() new string: %s\n", str);
- return this->add(str);
- }
-}
-
-uint32_t StringPool::size()
-{
- return fBufferUsed;
-}
-
-const char* StringPool::getBuffer()
-{
- return fBuffer;
-}
-
-const char* StringPool::stringAtIndex(uint32_t index) const
-{
- return &fBuffer[index];
-}
-
-
-
-struct LocalSymbolInfo
-{
- uint32_t dylibOffset;
- uint32_t nlistStartIndex;
- uint32_t nlistCount;
-};
-
-
-template <typename A>
-class SharedCache
-{
-public:
- SharedCache(ArchGraph* graph, const char* rootPath, const std::vector<const char*>& overlayPaths, const char* cacheDir, bool explicitCacheDir,
- bool alphaSort, bool verify, bool optimize, uint64_t dyldBaseAddress);
- bool update(bool force, bool optimize, bool deleteExistingFirst, int archIndex,
- int archCount, bool keepSignatures, bool dontMapLocalSymbols);
- void writeCacheFile(const char *cacheFilePath, uint8_t *cacheFileBuffer, uint32_t cacheFileSize, bool deleteOldCache);
- static const char* cacheFileSuffix(bool optimized, const char* archName);
-
- // vm address = address AS WRITTEN into the cache
- // mapped address = address AS MAPPED into the update process only
- // file offset = offset relative to start of cache file
- void * mappedAddressForVMAddress(uint64_t vmaddr);
- uint64_t VMAddressForMappedAddress(const void *mapaddr);
- uint64_t cacheFileOffsetForVMAddress(uint64_t addr) const;
- uint64_t VMAddressForCacheFileOffset(uint64_t addr) const;
-
- static const char* archName();
-
-private:
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
- bool notUpToDate(const char* path, unsigned int aliasCount);
- bool notUpToDate(const void* cache, unsigned int aliasCount);
- uint8_t* optimizeLINKEDIT(bool keepSignatures, bool dontMapLocalSymbols);
- void optimizeObjC(std::vector<void*>& pointersInData);
-
- static void getSharedCacheBasAddresses(cpu_type_t arch, uint64_t* baseReadOnly, uint64_t* baseWritable);
- static cpu_type_t arch();
- static uint64_t sharedRegionStartAddress();
- static uint64_t sharedRegionSize();
- static uint64_t sharedRegionStartWritableAddress(uint64_t);
- static uint64_t sharedRegionStartReadOnlyAddress(uint64_t, uint64_t);
- static uint64_t getWritableSegmentNewAddress(uint64_t proposedNewAddress, uint64_t originalAddress, uint64_t executableSlide);
- static bool addCacheSlideInfo();
- static uint64_t pathHash(const char*);
-
- static uint64_t pageAlign(uint64_t addr);
- static uint64_t regionAlign(uint64_t addr);
- static uint64_t pageAlign4KB(uint64_t addr);
- void assignNewBaseAddresses(bool verify);
-
- struct LayoutInfo {
- const MachOLayoutAbstraction* layout;
- std::vector<const char*> aliases;
- dyld_cache_image_info info;
- };
-
- struct ByNameSorter {
- bool operator()(const LayoutInfo& left, const LayoutInfo& right)
- { return (strcmp(left.layout->getID().name, right.layout->getID().name) < 0); }
- };
-
- struct ByAddressSorter {
- bool operator()(const LayoutInfo& left, const LayoutInfo& right) {
- return (left.layout->getSegments()[0].newAddress() < right.layout->getSegments()[0].newAddress());
- }
- };
-
- struct ByCStringSectionSizeSorter {
- bool operator()(const LayoutInfo& left, const LayoutInfo& right) {
- const std::vector<MachOLayoutAbstraction::Segment>& segs_l =
- left.layout->getSegments();
- const std::vector<MachOLayoutAbstraction::Segment>& segs_r =
- right.layout->getSegments();
- if (segs_l.size() == 0 || segs_r.size() == 0) {
- // one image has no segments
- return segs_l.size() > segs_r.size();
- }
- const macho_header<P> *mh_l = (macho_header<P>*)segs_l[0].mappedAddress();
- const macho_header<P> *mh_r = (macho_header<P>*)segs_r[0].mappedAddress();
- const macho_section<P> *cstring_l = mh_l->getSection("__TEXT", "__cstring");
- const macho_section<P> *cstring_r = mh_r->getSection("__TEXT", "__cstring");
- if (!cstring_l || !cstring_r) {
- // one image has no cstrings
- return cstring_l && !cstring_r;
- }
-
- return cstring_l->size() > cstring_r->size();
- }
- };
-
- struct Sorter {
- Sorter(std::map<const MachOLayoutAbstraction*, uint32_t>& map): fMap(map) {}
- bool operator()(const LayoutInfo& left, const LayoutInfo& right) {
- return (fMap[left.layout] < fMap[right.layout]);
- }
- private:
- std::map<const MachOLayoutAbstraction*, uint32_t>& fMap;
- };
-
-
- ArchGraph* fArchGraph;
- const bool fVerify;
- bool fExistingIsNotUpToDate;
- bool fCacheFileInFinalLocation;
- const char* fCacheFilePath;
- uint8_t* fExistingCacheForVerification;
- std::vector<LayoutInfo> fDylibs;
- std::vector<LayoutInfo> fDylibAliases;
- std::vector<shared_file_mapping_np> fMappings;
- std::vector<macho_nlist<P> > fUnmappedLocalSymbols;
- StringPool fUnmappedLocalsStringPool;
- std::vector<LocalSymbolInfo> fLocalSymbolInfos;
- uint32_t fHeaderSize;
- uint8_t* fInMemoryCache;
- uint64_t fDyldBaseAddress;
- uint64_t fLinkEditsTotalUnoptimizedSize;
- uint64_t fLinkEditsStartAddress;
- MachOLayoutAbstraction::Segment* fFirstLinkEditSegment;
- uint32_t fOffsetOfBindInfoInCombinedLinkedit;
- uint32_t fOffsetOfWeakBindInfoInCombinedLinkedit;
- uint32_t fOffsetOfLazyBindInfoInCombinedLinkedit;
- uint32_t fOffsetOfExportInfoInCombinedLinkedit;
- uint32_t fOffsetOfOldSymbolTableInfoInCombinedLinkedit;
- uint32_t fSizeOfOldSymbolTableInfoInCombinedLinkedit;
- uint32_t fOffsetOfOldExternalRelocationsInCombinedLinkedit;
- uint32_t fSizeOfOldExternalRelocationsInCombinedLinkedit;
- uint32_t fOffsetOfOldIndirectSymbolsInCombinedLinkedit;
- uint32_t fSizeOfOldIndirectSymbolsInCombinedLinkedit;
- uint32_t fOffsetOfOldStringPoolInCombinedLinkedit;
- uint32_t fSizeOfOldStringPoolInCombinedLinkedit;
- uint32_t fOffsetOfFunctionStartsInCombinedLinkedit;
- uint32_t fSizeOfFunctionStartsInCombinedLinkedit;
- uint32_t fOffsetOfDataInCodeInCombinedLinkedit;
- uint32_t fSizeOfDataInCodeInCombinedLinkedit;
- uint32_t fLinkEditsTotalOptimizedSize;
- uint32_t fUnmappedLocalSymbolsSize;
-};
-
-
-// Access a section containing a list of pointers
-template <typename A, typename T>
-class PointerSection
-{
- typedef typename A::P P;
- typedef typename A::P::uint_t pint_t;
-
- SharedCache<A>* const fCache;
- const macho_section<P>* const fSection;
- pint_t * const fBase;
- pint_t fCount;
-
-public:
- PointerSection(SharedCache<A>* cache, const macho_header<P>* header,
- const char *segname, const char *sectname)
- : fCache(cache)
- , fSection(header->getSection(segname, sectname))
- , fBase(fSection ? (pint_t *)cache->mappedAddressForVMAddress(fSection->addr()) : 0)
- , fCount(fSection ? fSection->size() / sizeof(pint_t) : 0)
- {
- }
-
- pint_t count() const { return fCount; }
-
- pint_t getVMAddress(pint_t index) const {
- if (index >= fCount) throwf("index out of range");
- return P::getP(fBase[index]);
- }
-
- T get(pint_t index) const {
- return (T)fCache->mappedAddressForVMAddress(getVMAddress(index));
- }
-
- void setVMAddress(pint_t index, pint_t value) {
- if (index >= fCount) throwf("index out of range");
- P::setP(fBase[index], value);
- }
-
- void removeNulls() {
- pint_t shift = 0;
- for (pint_t i = 0; i < fCount; i++) {
- pint_t value = fBase[i];
- if (value) {
- fBase[i-shift] = value;
- } else {
- shift++;
- }
- }
- fCount -= shift;
- const_cast<macho_section<P>*>(fSection)->set_size(fCount * sizeof(pint_t));
- }
-};
-
-// Access a section containing an array of structures
-template <typename A, typename T>
-class ArraySection
-{
- typedef typename A::P P;
-
- SharedCache<A>* const fCache;
- const macho_section<P>* const fSection;
- T * const fBase;
- uint64_t const fCount;
-
-public:
- ArraySection(SharedCache<A>* cache, const macho_header<P>* header,
- const char *segname, const char *sectname)
- : fCache(cache)
- , fSection(header->getSection(segname, sectname))
- , fBase(fSection ? (T *)cache->mappedAddressForVMAddress(fSection->addr()) : 0)
- , fCount(fSection ? fSection->size() / sizeof(T) : 0)
- {
- }
-
- uint64_t count() const { return fCount; }
-
- T& get(uint64_t index) const {
- if (index >= fCount) throwf("index out of range");
- return fBase[index];
- }
-};
-
-
-// GrP fixme
-#include "ObjCLegacyAbstraction.hpp"
-#include "ObjCModernAbstraction.hpp"
-
-
-
-template <> cpu_type_t SharedCache<x86>::arch() { return CPU_TYPE_I386; }
-template <> cpu_type_t SharedCache<x86_64>::arch() { return CPU_TYPE_X86_64; }
-template <> cpu_type_t SharedCache<arm>::arch() { return CPU_TYPE_ARM; }
-template <> cpu_type_t SharedCache<arm64>::arch() { return CPU_TYPE_ARM64; }
-
-template <> uint64_t SharedCache<x86>::sharedRegionStartAddress() { return 0x90000000; }
-template <> uint64_t SharedCache<x86_64>::sharedRegionStartAddress() { return 0x7FFF80000000LL; }
-template <> uint64_t SharedCache<arm>::sharedRegionStartAddress() { return ARM_SHARED_REGION_START; }
-template <> uint64_t SharedCache<arm64>::sharedRegionStartAddress() { return ARM64_SHARED_REGION_START; }
-
-template <> uint64_t SharedCache<x86>::sharedRegionSize() { return 0x20000000; }
-template <> uint64_t SharedCache<x86_64>::sharedRegionSize() { return 0x40000000; }
-template <> uint64_t SharedCache<arm>::sharedRegionSize() { return ARM_SHARED_REGION_SIZE; }
-template <> uint64_t SharedCache<arm64>::sharedRegionSize() { return ARM64_SHARED_REGION_SIZE; }
-
-template <> uint64_t SharedCache<x86>::sharedRegionStartWritableAddress(uint64_t exEnd) { return exEnd + 0x04000000; }
-template <> uint64_t SharedCache<x86_64>::sharedRegionStartWritableAddress(uint64_t exEnd) { return 0x7FFF70000000LL; }
-template <> uint64_t SharedCache<arm>::sharedRegionStartWritableAddress(uint64_t exEnd) { return (exEnd + 16383) & (-16384); }
-template <> uint64_t SharedCache<arm64>::sharedRegionStartWritableAddress(uint64_t exEnd) { return exEnd; }
-
-template <> uint64_t SharedCache<x86>::sharedRegionStartReadOnlyAddress(uint64_t wrEnd, uint64_t exEnd) { return wrEnd + 0x04000000; }
-template <> uint64_t SharedCache<x86_64>::sharedRegionStartReadOnlyAddress(uint64_t wrEnd, uint64_t exEnd){ return exEnd; }
-template <> uint64_t SharedCache<arm>::sharedRegionStartReadOnlyAddress(uint64_t wrEnd, uint64_t exEnd) { return (wrEnd + 16383) & (-16384); }
-template <> uint64_t SharedCache<arm64>::sharedRegionStartReadOnlyAddress(uint64_t wrEnd, uint64_t exEnd) { return (wrEnd + 16383) & (-16384); }
-
-template <> const char* SharedCache<x86>::archName() { return "i386"; }
-template <> const char* SharedCache<x86_64>::archName() { return "x86_64"; }
-template <> const char* SharedCache<arm>::archName() { return "arm"; }
-template <> const char* SharedCache<arm64>::archName() { return "arm64"; }
-
-template <> const char* SharedCache<x86>::cacheFileSuffix(bool, const char* archName) { return archName; }
-template <> const char* SharedCache<x86_64>::cacheFileSuffix(bool, const char* archName){ return archName; }
-template <> const char* SharedCache<arm>::cacheFileSuffix(bool, const char* archName) { return archName; }
-template <> const char* SharedCache<arm64>::cacheFileSuffix(bool, const char* archName) { return archName; }
-
-template <> uint64_t SharedCache<x86>::pageAlign(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-template <> uint64_t SharedCache<x86_64>::pageAlign(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-template <> uint64_t SharedCache<arm>::pageAlign(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-template <> uint64_t SharedCache<arm64>::pageAlign(uint64_t addr) { return ( (addr + 16383) & (-16384) ); }
-
-template <> uint64_t SharedCache<x86>::regionAlign(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-template <> uint64_t SharedCache<x86_64>::regionAlign(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-template <> uint64_t SharedCache<arm>::regionAlign(uint64_t addr) { return ( (addr + 16383) & (-16384) ); }
-template <> uint64_t SharedCache<arm64>::regionAlign(uint64_t addr) { return ( (addr + 16383) & (-16384) ); }
-
-
-template <typename A>
-uint64_t SharedCache<A>::pageAlign4KB(uint64_t addr) { return ( (addr + 4095) & (-4096) ); }
-
-template <typename A>
-SharedCache<A>::SharedCache(ArchGraph* graph, const char* rootPath, const std::vector<const char*>& overlayPaths, const char* cacheDir, bool explicitCacheDir, bool alphaSort, bool verify, bool optimize, uint64_t dyldBaseAddress)
- : fArchGraph(graph), fVerify(verify), fExistingIsNotUpToDate(true),
- fCacheFileInFinalLocation(rootPath[0] == '\0'), fCacheFilePath(NULL),
- fExistingCacheForVerification(NULL), fDyldBaseAddress(dyldBaseAddress),
- fOffsetOfBindInfoInCombinedLinkedit(0), fOffsetOfWeakBindInfoInCombinedLinkedit(0),
- fOffsetOfLazyBindInfoInCombinedLinkedit(0), fOffsetOfExportInfoInCombinedLinkedit(0),
- fOffsetOfOldSymbolTableInfoInCombinedLinkedit(0), fSizeOfOldSymbolTableInfoInCombinedLinkedit(0),
- fOffsetOfOldExternalRelocationsInCombinedLinkedit(0), fSizeOfOldExternalRelocationsInCombinedLinkedit(0),
- fOffsetOfOldIndirectSymbolsInCombinedLinkedit(0), fSizeOfOldIndirectSymbolsInCombinedLinkedit(0),
- fOffsetOfOldStringPoolInCombinedLinkedit(0), fSizeOfOldStringPoolInCombinedLinkedit(0),
- fOffsetOfFunctionStartsInCombinedLinkedit(0), fSizeOfFunctionStartsInCombinedLinkedit(0),
- fOffsetOfDataInCodeInCombinedLinkedit(0), fSizeOfDataInCodeInCombinedLinkedit(0),
- fUnmappedLocalSymbolsSize(0)
-{
- if ( fArchGraph->getArchPair().arch != arch() )
- throwf("SharedCache object is wrong architecture: 0x%08X vs 0x%08X", fArchGraph->getArchPair().arch, arch());
-
- // build vector of all shared dylibs
- unsigned int aliasCount = 0;
- std::set<const MachOLayoutAbstraction*>& dylibs = fArchGraph->getSharedDylibs();
- ArchGraph::StringToString& aliases = fArchGraph->getDylibAliases();
- for(std::set<const MachOLayoutAbstraction*>::iterator it = dylibs.begin(); it != dylibs.end(); ++it) {
- const MachOLayoutAbstraction* lib = *it;
- LayoutInfo temp;
- temp.layout = lib;
- temp.info.address = 0;
- temp.info.inode = lib->getInode();
- temp.info.modTime = lib->getLastModTime();
- if ( iPhoneOS ) {
- temp.info.inode = pathHash(lib->getID().name);
- temp.info.modTime = 0;
- }
- temp.info.pathFileOffset = lib->getNameFileOffset(); // for now this is the offset within the dylib
- for(ArchGraph::StringToString::iterator ait = aliases.begin(); ait != aliases.end(); ++ait) {
- if ( strcmp(ait->second, lib->getID().name) == 0 ) {
- temp.aliases.push_back(ait->first);
- ++aliasCount;
- }
- }
- fDylibs.push_back(temp);
- }
-
- // create path to cache file
- char cachePathCanonical[MAXPATHLEN];
- strcpy(cachePathCanonical, cacheDir);
- if ( cachePathCanonical[strlen(cachePathCanonical)-1] != '/' )
- strcat(cachePathCanonical, "/");
- strcat(cachePathCanonical, DYLD_SHARED_CACHE_BASE_NAME);
- strcat(cachePathCanonical, cacheFileSuffix(optimize, fArchGraph->archName()));
- char cachePath[MAXPATHLEN];
- if ( explicitCacheDir ) {
- fCacheFilePath = strdup(cachePathCanonical);
- }
- else if ( overlayPaths.size() == 1 ) {
- // if no -cache_dir and exactly on -overlay, write cache file into that overlay dir
- strcpy(cachePath, overlayPaths[0]);
- strcat(cachePath, "/");
- strcat(cachePath, cachePathCanonical);
- fCacheFilePath = strdup(cachePath);
- }
- else if ( rootPath[0] != '\0' ) {
- strcpy(cachePath, rootPath);
- strcat(cachePath, "/");
- strcat(cachePath, cachePathCanonical);
- fCacheFilePath = strdup(cachePath);
- }
- else {
- fCacheFilePath = strdup(cachePathCanonical);
- }
-
- // If the path we are writing to is trusted then our sources need to be trusted
- // <rdar://problem/21166835> Can't update the update_dyld_shared_cache on a non-boot volume
- rootless = rootless_check_trusted(fCacheFilePath);
-
- if ( overlayPaths.size() == 1 ) {
- // in overlay mode if there already is a cache file in the overlay,
- // check if it is up to date.
- struct stat stat_buf;
- if ( stat(fCacheFilePath, &stat_buf) == 0 ) {
- fExistingIsNotUpToDate = this->notUpToDate(fCacheFilePath, aliasCount);
- }
- else if ( rootPath[0] != '\0' ) {
- // using -root and -overlay, but no cache file in overlay, check one in -root
- char cachePathRoot[MAXPATHLEN];
- strcpy(cachePathRoot, rootPath);
- strcat(cachePathRoot, "/");
- strcat(cachePathRoot, cachePathCanonical);
- fExistingIsNotUpToDate = this->notUpToDate(cachePathRoot, aliasCount);
- }
- else {
- // uisng -overlay, but no cache file in overlay, check one in boot volume
- fExistingIsNotUpToDate = this->notUpToDate(cachePathCanonical, aliasCount);
- }
- }
- else {
- fExistingIsNotUpToDate = this->notUpToDate(fCacheFilePath, aliasCount);
- }
-
- // sort shared dylibs
- if ( verify ) {
- // already sorted by notUpToDate()
- }
- else if ( alphaSort ) {
- std::sort(fDylibs.begin(), fDylibs.end(), ByNameSorter());
- }
- else {
- // random sort for Address Space Randomization
- std::map<const MachOLayoutAbstraction*, uint32_t> map;
- for(typename std::vector<struct LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it)
- map[it->layout] = arc4random();
- std::sort(fDylibs.begin(), fDylibs.end(), Sorter(map));
- }
-
- // assign segments in each dylib a new address
- this->assignNewBaseAddresses(verify);
-
- // calculate where string pool offset will start
- // calculate cache file header size
- fHeaderSize = sizeof(dyld_cache_header)
- + fMappings.size()*sizeof(shared_file_mapping_np)
- + (fDylibs.size()+aliasCount)*sizeof(dyld_cache_image_info);
- const uint64_t baseHeaderSize = fHeaderSize;
- //fprintf(stderr, "aliasCount=%d, fHeaderSize=0x%08X\n", aliasCount, fHeaderSize);
- // build list of aliases and compute where each ones path string will go
- for(typename std::vector<struct LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- for(std::vector<const char*>::const_iterator ait = it->aliases.begin(); ait != it->aliases.end(); ++ait) {
- LayoutInfo temp = *it;
- // alias looks just like real dylib, but has a different name string
- const char* aliasPath = *ait;
- temp.aliases.clear();
- temp.aliases.push_back(aliasPath);
- temp.info.pathFileOffset = fHeaderSize;
- if ( iPhoneOS ) {
- temp.info.inode = pathHash(aliasPath);
- temp.info.modTime = 0;
- }
- fDylibAliases.push_back(temp);
- fHeaderSize += strlen(aliasPath)+1;
- }
- }
- std::sort(fDylibAliases.begin(), fDylibAliases.end(), ByNameSorter());
- //fprintf(stderr, "fHeaderSize=0x%08X, fDylibAliases.size()=%lu\n", fHeaderSize, fDylibAliases.size());
- fHeaderSize = pageAlign(fHeaderSize);
-
- // check that cache we are about to create for verification purposes has same layout as existing cache
- if ( verify ) {
- // if no existing cache, say so
- if ( fExistingCacheForVerification == NULL ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, could not verify because cache file does not exist in /var/db/dyld/\n",
- getpid(), fArchGraph->archName());
- }
- const dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)fExistingCacheForVerification;
- const dyldCacheImageInfo<E>* cacheEntry = (dyldCacheImageInfo<E>*)(fExistingCacheForVerification + header->imagesOffset());
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it, ++cacheEntry) {
- if ( cacheEntry->address() != it->layout->getSegments()[0].newAddress() ) {
- throwf("update_dyld_shared_cache[%u] warning: for arch=%s, could not verify cache because start address of %s is 0x%llX in cache, but should be 0x%llX\n",
- getpid(), fArchGraph->archName(), it->layout->getID().name, cacheEntry->address(), it->layout->getSegments()[0].newAddress());
- }
- }
- }
-
-
- if ( fHeaderSize > FIRST_DYLIB_TEXT_OFFSET )
- throwf("header size overflow: allowed=0x%08X, base=0x%08llX, aliases=0x%08llX", FIRST_DYLIB_TEXT_OFFSET, baseHeaderSize, fHeaderSize-baseHeaderSize);
-}
-
-
-template <typename A>
-uint64_t SharedCache<A>::getWritableSegmentNewAddress(uint64_t proposedNewAddress, uint64_t originalAddress, uint64_t executableSlide)
-{
- return proposedNewAddress;
-}
-
-template <typename A>
-uint64_t SharedCache<A>::pathHash(const char* path)
-{
- uint64_t sum = 0;
- for (const char* s=path; *s != '\0'; ++s)
- sum += sum*4 + *s;
- return sum;
-}
-
-
-template <typename A>
-void SharedCache<A>::assignNewBaseAddresses(bool verify)
-{
- // first layout TEXT for dylibs
- const uint64_t startExecuteAddress = sharedRegionStartAddress();
- uint64_t currentExecuteAddress = startExecuteAddress + FIRST_DYLIB_TEXT_OFFSET;
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- std::vector<MachOLayoutAbstraction::Segment>& segs = ((MachOLayoutAbstraction*)(it->layout))->getSegments();
- for (int i=0; i < segs.size(); ++i) {
- MachOLayoutAbstraction::Segment& seg = segs[i];
- seg.reset();
- if ( seg.executable() && !seg.writable() ) {
- // <rdar://problem/15947734> Some dylib require extra alignment
- currentExecuteAddress = (currentExecuteAddress + seg.alignment() - 1) & (-seg.alignment());
- // __TEXT segment
- if ( it->info.address == 0 )
- it->info.address = currentExecuteAddress;
- seg.setNewAddress(currentExecuteAddress);
- currentExecuteAddress += pageAlign(seg.size());
- }
- }
- }
- // align __TEXT region
- currentExecuteAddress = regionAlign(currentExecuteAddress);
-
-#define DENSE_PACK 0
- // layout __DATA* segments
- std::vector<MachOLayoutAbstraction::Segment*> dataSegs;
- std::vector<MachOLayoutAbstraction::Segment*> dataConstSegs;
- std::vector<MachOLayoutAbstraction::Segment*> dataDirtySegs;
- const uint64_t startWritableAddress = sharedRegionStartWritableAddress(currentExecuteAddress);
- uint64_t currentWritableAddress = startWritableAddress;
- for (const LayoutInfo& info : fDylibs ) {
- for (MachOLayoutAbstraction::Segment& seg : ((MachOLayoutAbstraction*)(info.layout))->getSegments()) {
- if ( seg.writable() ) {
- if ( seg.executable() )
- throw "found writable and executable segment";
- seg.reset();
- if ( strcmp(seg.name(), "__DATA_CONST") == 0 )
- dataConstSegs.push_back(&seg);
- else if ( strcmp(seg.name(), "__DATA_DIRTY") == 0 )
- dataDirtySegs.push_back(&seg);
- else
- dataSegs.push_back(&seg);
- }
- }
- }
- // coalesce all __DATA_CONST segments
- for (MachOLayoutAbstraction::Segment* seg : dataConstSegs) {
- #if DENSE_PACK
- // start segment at needed alignment
- currentWritableAddress = (currentWritableAddress + seg->sectionsAlignment() - 1) & (-seg->sectionsAlignment());
- seg->setNewAddress(currentWritableAddress);
- // pack together
- uint64_t justSectionsSize = seg->sectionsSize();
- currentWritableAddress = seg->newAddress() + justSectionsSize;
- seg->setSize(justSectionsSize);
- if ( seg->fileSize() > justSectionsSize )
- seg->setFileSize(justSectionsSize);
- #else
- seg->setNewAddress(currentWritableAddress);
- // pack to 4KB pages
- currentWritableAddress = pageAlign4KB(seg->newAddress() + seg->size());
- #endif
- }
- #if DENSE_PACK
- currentWritableAddress = pageAlign4KB(currentWritableAddress);
- #endif
- // coalesce all __DATA segments
- for (MachOLayoutAbstraction::Segment* seg : dataSegs) {
- #if DENSE_PACK
- // start segment at needed alignment
- currentWritableAddress = (currentWritableAddress + seg->sectionsAlignment() - 1) & (-seg->sectionsAlignment());
- seg->setNewAddress(currentWritableAddress);
- // pack together
- uint64_t justSectionsSize = seg->sectionsSize();
- currentWritableAddress = seg->newAddress() + justSectionsSize;
- seg->setSize(justSectionsSize);
- if ( seg->fileSize() > justSectionsSize )
- seg->setFileSize(justSectionsSize);
- #else
- seg->setNewAddress(currentWritableAddress);
- // pack to 4KB pages
- currentWritableAddress = pageAlign4KB(seg->newAddress() + seg->size());
- #endif
- }
- #if DENSE_PACK
- currentWritableAddress = pageAlign4KB(currentWritableAddress);
- #endif
- // coalesce all __DATA_DIRTY segments
- for (MachOLayoutAbstraction::Segment* seg : dataDirtySegs) {
- // start segment at needed alignment
- currentWritableAddress = (currentWritableAddress + seg->sectionsAlignment() - 1) & (-seg->sectionsAlignment());
- seg->setNewAddress(currentWritableAddress);
- // pack together
- uint64_t justSectionsSize = seg->sectionsSize();
- currentWritableAddress = seg->newAddress() + justSectionsSize;
- seg->setSize(justSectionsSize);
- if ( seg->fileSize() > justSectionsSize )
- seg->setFileSize(justSectionsSize);
- }
- // align __DATA region
- currentWritableAddress = regionAlign(currentWritableAddress);
-
- // layout all read-only (but not LINKEDIT) segments
- const uint64_t startReadOnlyAddress = sharedRegionStartReadOnlyAddress(currentWritableAddress, currentExecuteAddress);
- uint64_t currentReadOnlyAddress = startReadOnlyAddress;
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- std::vector<MachOLayoutAbstraction::Segment>& segs = ((MachOLayoutAbstraction*)(it->layout))->getSegments();
- for(int i=0; i < segs.size(); ++i) {
- MachOLayoutAbstraction::Segment& seg = segs[i];
- if ( seg.readable() && !seg.writable() && !seg.executable() && (strcmp(seg.name(), "__LINKEDIT") != 0) ) {
- // __UNICODE segment
- seg.setNewAddress(currentReadOnlyAddress);
- currentReadOnlyAddress += pageAlign(seg.size());
- }
- }
- }
-
- // layout all LINKEDIT segments at end of all read-only segments
- currentReadOnlyAddress = regionAlign(currentReadOnlyAddress); // <rdar://problem/16491435>
- fLinkEditsStartAddress = currentReadOnlyAddress;
- fFirstLinkEditSegment = NULL;
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- std::vector<MachOLayoutAbstraction::Segment>& segs = ((MachOLayoutAbstraction*)(it->layout))->getSegments();
- for(int i=0; i < segs.size(); ++i) {
- MachOLayoutAbstraction::Segment& seg = segs[i];
- if ( seg.readable() && !seg.writable() && !seg.executable() && (strcmp(seg.name(), "__LINKEDIT") == 0) ) {
- if ( fFirstLinkEditSegment == NULL )
- fFirstLinkEditSegment = &seg;
- seg.setNewAddress(currentReadOnlyAddress);
- currentReadOnlyAddress += pageAlign(seg.size());
- }
- }
- }
- fLinkEditsTotalUnoptimizedSize = pageAlign(currentReadOnlyAddress - fLinkEditsStartAddress);
-
- // populate large mappings
- uint64_t cacheFileOffset = 0;
- if ( currentExecuteAddress > startExecuteAddress ) {
- shared_file_mapping_np executeMapping;
- executeMapping.sfm_address = startExecuteAddress;
- executeMapping.sfm_size = currentExecuteAddress - startExecuteAddress;
- executeMapping.sfm_file_offset = cacheFileOffset;
- executeMapping.sfm_max_prot = VM_PROT_READ | VM_PROT_EXECUTE;
- executeMapping.sfm_init_prot = VM_PROT_READ | VM_PROT_EXECUTE;
- fMappings.push_back(executeMapping);
- cacheFileOffset += executeMapping.sfm_size;
-
- shared_file_mapping_np writableMapping;
- writableMapping.sfm_address = startWritableAddress;
- writableMapping.sfm_size = currentWritableAddress - startWritableAddress;
- writableMapping.sfm_file_offset = cacheFileOffset;
- writableMapping.sfm_max_prot = VM_PROT_READ | VM_PROT_WRITE;
- writableMapping.sfm_init_prot = VM_PROT_READ | VM_PROT_WRITE;
- fMappings.push_back(writableMapping);
- cacheFileOffset += writableMapping.sfm_size;
-
- // make read-only (contains LINKEDIT segments) last, so it can be cut back when optimized
- shared_file_mapping_np readOnlyMapping;
- readOnlyMapping.sfm_address = startReadOnlyAddress;
- readOnlyMapping.sfm_size = currentReadOnlyAddress - startReadOnlyAddress;
- readOnlyMapping.sfm_file_offset = cacheFileOffset;
- readOnlyMapping.sfm_max_prot = VM_PROT_READ;
- readOnlyMapping.sfm_init_prot = VM_PROT_READ;
- fMappings.push_back(readOnlyMapping);
- cacheFileOffset += readOnlyMapping.sfm_size;
- }
- else {
- // empty cache
- shared_file_mapping_np cacheHeaderMapping;
- cacheHeaderMapping.sfm_address = startExecuteAddress;
- cacheHeaderMapping.sfm_size = FIRST_DYLIB_TEXT_OFFSET;
- cacheHeaderMapping.sfm_file_offset = cacheFileOffset;
- cacheHeaderMapping.sfm_max_prot = VM_PROT_READ;
- cacheHeaderMapping.sfm_init_prot = VM_PROT_READ;
- fMappings.push_back(cacheHeaderMapping);
- cacheFileOffset += cacheHeaderMapping.sfm_size;
- }
-}
-
-
-template <typename A>
-uint64_t SharedCache<A>::cacheFileOffsetForVMAddress(uint64_t vmaddr) const
-{
- for(std::vector<shared_file_mapping_np>::const_iterator it = fMappings.begin(); it != fMappings.end(); ++it) {
- if ( (it->sfm_address <= vmaddr) && (vmaddr < it->sfm_address+it->sfm_size) )
- return it->sfm_file_offset + vmaddr - it->sfm_address;
- }
- throwf("address 0x%0llX is not in cache", vmaddr);
-}
-
-template <typename A>
-uint64_t SharedCache<A>::VMAddressForCacheFileOffset(uint64_t offset) const
-{
- for(std::vector<shared_file_mapping_np>::const_iterator it = fMappings.begin(); it != fMappings.end(); ++it) {
- if ( (it->sfm_file_offset <= offset) && (offset < it->sfm_file_offset+it->sfm_size) )
- return it->sfm_address + offset - it->sfm_file_offset;
- }
- throwf("offset 0x%0llX is not in cache", offset);
-}
-
-template <typename A>
-void *SharedCache<A>::mappedAddressForVMAddress(uint64_t vmaddr)
-{
- if (!vmaddr) return NULL;
- else return fInMemoryCache + cacheFileOffsetForVMAddress(vmaddr);
-}
-
-template <typename A>
-uint64_t SharedCache<A>::VMAddressForMappedAddress(const void *mapaddr)
-{
- if (!mapaddr) return 0;
- uint64_t offset = (uint8_t *)mapaddr - (uint8_t *)fInMemoryCache;
- return VMAddressForCacheFileOffset(offset);
-}
-
-
-template <typename A>
-bool SharedCache<A>::notUpToDate(const void* cache, unsigned int aliasCount)
-{
- dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)cache;
- // not valid if header signature is wrong
- const char* archPairName = fArchGraph->archName();
- char temp[16];
- strcpy(temp, "dyld_v1 ");
- strcpy(&temp[15-strlen(archPairName)], archPairName);
- if ( strcmp(header->magic(), temp) != 0 ) {
- if ( fVerify ) {
- fprintf(stderr, "update_dyld_shared_cache[%u] cannot verify %s because current cache file has invalid header\n", getpid(), archPairName);
- return false;
- }
- else {
- fprintf(stderr, "update_dyld_shared_cache[%u] updating cache because current cache file has invalid header\n", getpid());
- return true;
- }
- }
- // not valid if count of images does not match current images needed
- if ( header->imagesCount() != (fDylibs.size()+aliasCount) ) {
- if ( fVerify ) {
- fprintf(stderr, "update_dyld_shared_cache[%u] cannot verify %s because current cache file contains a different set of dylibs\n", getpid(), archPairName);
- return false;
- }
- else {
- fprintf(stderr, "update_dyld_shared_cache[%u] updating %s cache because current cache file contains a different set of dylibs\n", getpid(), archPairName);
- return true;
- }
- }
- // get end of TEXT region
- const dyldCacheFileMapping<E>* textMapping = (dyldCacheFileMapping<E>*)((uint8_t*)cache+sizeof(dyldCacheHeader<E>));
- const uint32_t textSize = textMapping->size();
-
- // verify every dylib in constructed graph is in existing cache with same inode and modTime
- std::map<const MachOLayoutAbstraction*, uint32_t> sortingMap;
- const dyldCacheImageInfo<E>* imagesStart = (dyldCacheImageInfo<E>*)((uint8_t*)cache + header->imagesOffset());
- const dyldCacheImageInfo<E>* imagesEnd = &imagesStart[header->imagesCount()];
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- bool found = false;
- //fprintf(stderr, "inode=0x%llX, mTime=0x%llX, path=%s\n", it->info.inode, it->info.modTime, it->layout->getID().name);
- for(const dyldCacheImageInfo<E>* cacheEntry = imagesStart; cacheEntry < imagesEnd; ++cacheEntry) {
- if ( fVerify ) {
- if ( cacheEntry->pathFileOffset() > textSize ) {
- throwf("update_dyld_shared_cache[%u]: for arch=%s, image entries corrupt, bad path offset in %s\n",
- getpid(), archPairName, it->layout->getID().name);
- }
- // in -verify mode, just match by path and warn if file looks different
- if ( strcmp((char*)cache+cacheEntry->pathFileOffset(), it->layout->getID().name) == 0 ) {
- found = true;
- sortingMap[it->layout] = cacheEntry-imagesStart;
- if ( (cacheEntry->inode() != it->info.inode) || (cacheEntry->modTime() != it->info.modTime) ) {
- fprintf(stderr, "update_dyld_shared_cache[%u] warning: for arch=%s, %s has changed since cache was built\n",
- getpid(), archPairName, it->layout->getID().name);
- }
- break;
- }
- }
- else {
- if ( cacheEntry->pathFileOffset() > textSize ) {
- // cache corrupt, needs to be regenerated
- return true;
- }
- // in normal update mode, everything has to match for cache to be up-to-date
- if ( (cacheEntry->inode() == it->info.inode)
- && (cacheEntry->modTime() == it->info.modTime)
- && (strcmp((char*)cache+cacheEntry->pathFileOffset(), it->layout->getID().name) == 0) ) {
- found = true;
- break;
- }
- }
- }
- if ( !found ) {
- if ( fVerify ) {
- throwf("update_dyld_shared_cache[%u] can't verify %s cache because %s is not in existing cache\n", getpid(), archPairName, it->layout->getID().name);
- }
- else {
- fprintf(stderr, "update_dyld_shared_cache[%u] updating %s cache because dylib at %s has changed\n", getpid(), archPairName, it->layout->getID().name);
- return true;
- }
- }
- }
- // all dylibs in existing cache file match those determined need to be in shared cache
- if ( fVerify ) {
- // sort fDylibs to match existing cache file so we can compare content
- std::sort(fDylibs.begin(), fDylibs.end(), Sorter(sortingMap));
- //fprintf(stderr, "dylibs sorted like existing cache:\n");
- //for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- // fprintf(stderr," %s\n", it->layout->getID().name);
- //}
- // do regenerate a new cache so we can compare content with existing
- return true;
- }
- else {
- // existing cache file is up-to-date, don't need to regenerate
- return false;
- }
-}
-
-
-template <typename A>
-bool SharedCache<A>::notUpToDate(const char* path, unsigned int aliasCount)
-{
- // mmap existing cache file
- int fd = ::open(path, O_RDONLY);
- if ( fd == -1 )
- return true;
- struct stat stat_buf;
- ::fstat(fd, &stat_buf);
- uint32_t cacheFileSize = stat_buf.st_size;
- uint32_t cacheAllocatedSize = pageAlign(cacheFileSize);
- uint8_t* mappingAddr = NULL;
- if ( vm_allocate(mach_task_self(), (vm_address_t*)(&mappingAddr), cacheAllocatedSize, VM_FLAGS_ANYWHERE) != KERN_SUCCESS )
- throwf("can't vm_allocate cache of size %u", cacheFileSize);
- // <rdar://problem/8960832> update_dyld_shared_cache -verify finds differences
- (void)fcntl(fd, F_NOCACHE, 1);
- ssize_t readResult = pread(fd, mappingAddr, cacheFileSize, 0);
- if ( readResult != cacheFileSize )
- throwf("can't read all of existing cache file (%lu of %u): %s", readResult, cacheFileSize, path);
- ::close(fd);
-
- // validate it
- bool result = this->notUpToDate(mappingAddr, aliasCount);
- if ( fVerify ) {
- // don't unmap yet, leave so it can be verified later
- fExistingCacheForVerification = mappingAddr;
- }
- else {
- // unmap
- vm_deallocate(mach_task_self(), (vm_address_t)mappingAddr, cacheAllocatedSize);
- if ( verbose && !result )
- fprintf(stderr, "update_dyld_shared_cache: %s is up-to-date\n", path);
- }
- return result;
-}
-
-
-
-template <typename A>
-class LinkEditOptimizer
-{
-public:
- LinkEditOptimizer(const MachOLayoutAbstraction&, const SharedCache<A>&, uint8_t*, StringPool&);
- virtual ~LinkEditOptimizer() {}
-
- void copyBindInfo(uint32_t&);
- void copyWeakBindInfo(uint32_t&);
- void copyLazyBindInfo(uint32_t&);
- void copyExportInfo(uint32_t&);
- void copyLocalSymbols(uint32_t symbolTableOffset, uint32_t&, bool dontMapLocalSymbols,
- uint8_t* cacheStart, StringPool& unmappedLocalsStringPool,
- std::vector<macho_nlist<typename A::P> >& unmappedSymbols,
- std::vector<LocalSymbolInfo>& info);
- void copyExportedSymbols(uint32_t symbolTableOffset, uint32_t&);
- void copyImportedSymbols(uint32_t symbolTableOffset, uint32_t&);
- void copyExternalRelocations(uint32_t& offset);
- void copyIndirectSymbolTable(uint32_t& offset);
- void copyFunctionStarts(uint32_t& offset);
- void copyDataInCode(uint32_t& offset);
- void updateLoadCommands(uint64_t newVMAddress, uint64_t size, uint32_t stringPoolOffset,
- uint32_t linkEditsFileOffset, bool keepSignatures);
-
-
-protected:
- typedef typename A::P P;
- typedef typename A::P::E E;
- typedef typename A::P::uint_t pint_t;
-
-private:
-
- const SharedCache<A>& fSharedCache;
- const macho_header<P>* fHeader;
- uint8_t* fNewLinkEditStart;
- uint8_t* fLinkEditBase;
- const MachOLayoutAbstraction& fLayout;
- macho_dyld_info_command<P>* fDyldInfo;
- macho_dysymtab_command<P>* fDynamicSymbolTable;
- macho_linkedit_data_command<P>* fFunctionStarts;
- macho_linkedit_data_command<P>* fDataInCode;
- macho_symtab_command<P>* fSymbolTableLoadCommand;
- const macho_nlist<P>* fSymbolTable;
- const char* fStrings;
- StringPool& fNewStringPool;
- std::map<uint32_t,uint32_t> fOldToNewSymbolIndexes;
- uint32_t fBindInfoOffsetIntoNewLinkEdit;
- uint32_t fBindInfoSizeInNewLinkEdit;
- uint32_t fWeakBindInfoOffsetIntoNewLinkEdit;
- uint32_t fWeakBindInfoSizeInNewLinkEdit;
- uint32_t fLazyBindInfoOffsetIntoNewLinkEdit;
- uint32_t fLazyBindInfoSizeInNewLinkEdit;
- uint32_t fExportInfoOffsetIntoNewLinkEdit;
- uint32_t fExportInfoSizeInNewLinkEdit;
- uint32_t fSymbolTableStartOffsetInNewLinkEdit;
- uint32_t fLocalSymbolsStartIndexInNewLinkEdit;
- uint32_t fLocalSymbolsCountInNewLinkEdit;
- uint32_t fExportedSymbolsStartIndexInNewLinkEdit;
- uint32_t fExportedSymbolsCountInNewLinkEdit;
- uint32_t fImportSymbolsStartIndexInNewLinkEdit;
- uint32_t fImportedSymbolsCountInNewLinkEdit;
- uint32_t fExternalRelocationsOffsetIntoNewLinkEdit;
- uint32_t fIndirectSymbolTableOffsetInfoNewLinkEdit;
- uint32_t fFunctionStartsOffsetInNewLinkEdit;
- uint32_t fDataInCodeOffsetInNewLinkEdit;
- uint32_t fUnmappedLocalSymbolsStartIndexInNewLinkEdit;
- uint32_t fUnmappedLocalSymbolsCountInNewLinkEdit;
-};
-
-
-
-template <typename A>
-LinkEditOptimizer<A>::LinkEditOptimizer(const MachOLayoutAbstraction& layout, const SharedCache<A>& sharedCache, uint8_t* newLinkEdit, StringPool& stringPool)
- : fSharedCache(sharedCache), fLayout(layout), fLinkEditBase(NULL), fNewLinkEditStart(newLinkEdit), fDyldInfo(NULL),
- fDynamicSymbolTable(NULL), fFunctionStarts(NULL), fDataInCode(NULL),
- fSymbolTableLoadCommand(NULL), fSymbolTable(NULL), fStrings(NULL), fNewStringPool(stringPool),
- fBindInfoOffsetIntoNewLinkEdit(0), fBindInfoSizeInNewLinkEdit(0),
- fWeakBindInfoOffsetIntoNewLinkEdit(0), fWeakBindInfoSizeInNewLinkEdit(0),
- fLazyBindInfoOffsetIntoNewLinkEdit(0), fLazyBindInfoSizeInNewLinkEdit(0),
- fExportInfoOffsetIntoNewLinkEdit(0), fExportInfoSizeInNewLinkEdit(0),
- fSymbolTableStartOffsetInNewLinkEdit(0),
- fLocalSymbolsStartIndexInNewLinkEdit(0), fLocalSymbolsCountInNewLinkEdit(0),
- fExportedSymbolsStartIndexInNewLinkEdit(0), fExportedSymbolsCountInNewLinkEdit(0),
- fImportSymbolsStartIndexInNewLinkEdit(0), fImportedSymbolsCountInNewLinkEdit(0),
- fExternalRelocationsOffsetIntoNewLinkEdit(0), fIndirectSymbolTableOffsetInfoNewLinkEdit(0),
- fFunctionStartsOffsetInNewLinkEdit(0), fDataInCodeOffsetInNewLinkEdit(0),
- fUnmappedLocalSymbolsStartIndexInNewLinkEdit(0), fUnmappedLocalSymbolsCountInNewLinkEdit(0)
-
-{
- fHeader = (const macho_header<P>*)fLayout.getSegments()[0].mappedAddress();
-
- const std::vector<MachOLayoutAbstraction::Segment>& segments = fLayout.getSegments();
- for(std::vector<MachOLayoutAbstraction::Segment>::const_iterator it = segments.begin(); it != segments.end(); ++it) {
- const MachOLayoutAbstraction::Segment& seg = *it;
- if ( strcmp(seg.name(), "__LINKEDIT") == 0 )
- fLinkEditBase = (uint8_t*)seg.mappedAddress() - seg.fileOffset();
- }
- if ( fLinkEditBase == NULL )
- throw "no __LINKEDIT segment";
-
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- switch (cmd->cmd()) {
- case LC_SYMTAB:
- {
- fSymbolTableLoadCommand = (macho_symtab_command<P>*)cmd;
- fSymbolTable = (macho_nlist<P>*)(&fLinkEditBase[fSymbolTableLoadCommand->symoff()]);
- fStrings = (char*)&fLinkEditBase[fSymbolTableLoadCommand->stroff()];
- }
- break;
- case LC_DYSYMTAB:
- fDynamicSymbolTable = (macho_dysymtab_command<P>*)cmd;
- break;
- case LC_DYLD_INFO:
- case LC_DYLD_INFO_ONLY:
- fDyldInfo = (macho_dyld_info_command<P>*)cmd;
- break;
- case LC_FUNCTION_STARTS:
- fFunctionStarts = (macho_linkedit_data_command<P>*)cmd;
- case LC_DATA_IN_CODE:
- fDataInCode = (macho_linkedit_data_command<P>*)cmd;
- break;
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
- if ( fSymbolTable == NULL )
- throw "no LC_SYMTAB";
- if ( fDynamicSymbolTable == NULL )
- throw "no LC_DYSYMTAB";
-
-}
-
-
-template <typename A>
-class SymbolSorter
-{
-public:
- typedef typename A::P P;
- SymbolSorter(const StringPool& pool) : fStringPool(pool) {}
- bool operator()(const macho_nlist<P>& left, const macho_nlist<P>& right) {
- return (strcmp(fStringPool.stringAtIndex(left.n_strx()) , fStringPool.stringAtIndex(right.n_strx())) < 0);
- }
-
-private:
- const StringPool& fStringPool;
-};
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyBindInfo(uint32_t& offset)
-{
- if ( (fDyldInfo != NULL) && (fDyldInfo->bind_off() != 0) ) {
- fBindInfoOffsetIntoNewLinkEdit = offset;
- fBindInfoSizeInNewLinkEdit = fDyldInfo->bind_size();
- memcpy(fNewLinkEditStart+offset, &fLinkEditBase[fDyldInfo->bind_off()], fDyldInfo->bind_size());
- offset += fDyldInfo->bind_size();
- }
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::copyWeakBindInfo(uint32_t& offset)
-{
- if ( (fDyldInfo != NULL) && (fDyldInfo->weak_bind_off() != 0) ) {
- fWeakBindInfoOffsetIntoNewLinkEdit = offset;
- fWeakBindInfoSizeInNewLinkEdit = fDyldInfo->weak_bind_size();
- memcpy(fNewLinkEditStart+offset, &fLinkEditBase[fDyldInfo->weak_bind_off()], fDyldInfo->weak_bind_size());
- offset += fDyldInfo->weak_bind_size();
- }
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::copyLazyBindInfo(uint32_t& offset)
-{
- if ( (fDyldInfo != NULL) && (fDyldInfo->lazy_bind_off() != 0) ) {
- fLazyBindInfoOffsetIntoNewLinkEdit = offset;
- fLazyBindInfoSizeInNewLinkEdit = fDyldInfo->lazy_bind_size();
- memcpy(fNewLinkEditStart+offset, &fLinkEditBase[fDyldInfo->lazy_bind_off()], fDyldInfo->lazy_bind_size());
- offset += fDyldInfo->lazy_bind_size();
- }
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::copyExportInfo(uint32_t& offset)
-{
- if ( (fDyldInfo != NULL) && (fLayout.getDyldInfoExports() != NULL) ) {
- fExportInfoOffsetIntoNewLinkEdit = offset;
- fExportInfoSizeInNewLinkEdit = fDyldInfo->export_size();
- memcpy(fNewLinkEditStart+offset, fLayout.getDyldInfoExports(), fDyldInfo->export_size());
- offset += fDyldInfo->export_size();
- }
-}
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyLocalSymbols(uint32_t symbolTableOffset, uint32_t& symbolIndex, bool dontMapLocalSymbols, uint8_t* cacheStart,
- StringPool& unmappedLocalsStringPool, std::vector<macho_nlist<P> >& unmappedSymbols,
- std::vector<LocalSymbolInfo>& dylibInfos)
-{
- fLocalSymbolsStartIndexInNewLinkEdit = symbolIndex;
- LocalSymbolInfo localInfo;
- localInfo.dylibOffset = ((uint8_t*)fHeader) - cacheStart;
- localInfo.nlistStartIndex = unmappedSymbols.size();
- localInfo.nlistCount = 0;
- fSymbolTableStartOffsetInNewLinkEdit = symbolTableOffset + symbolIndex*sizeof(macho_nlist<P>);
- macho_nlist<P>* const newSymbolTableStart = (macho_nlist<P>*)(fNewLinkEditStart+symbolTableOffset);
- const macho_nlist<P>* const firstLocal = &fSymbolTable[fDynamicSymbolTable->ilocalsym()];
- const macho_nlist<P>* const lastLocal = &fSymbolTable[fDynamicSymbolTable->ilocalsym()+fDynamicSymbolTable->nlocalsym()];
- uint32_t oldIndex = fDynamicSymbolTable->ilocalsym();
- for (const macho_nlist<P>* entry = firstLocal; entry < lastLocal; ++entry, ++oldIndex) {
- // <rdar://problem/12237639> don't copy stab symbols
- if ( (entry->n_sect() != NO_SECT) && ((entry->n_type() & N_STAB) == 0) ) {
- const char* name = &fStrings[entry->n_strx()];
- macho_nlist<P>* newSymbolEntry = &newSymbolTableStart[symbolIndex];
- *newSymbolEntry = *entry;
- if ( dontMapLocalSymbols ) {
- // if local in __text, add <redacted> symbol name to shared cache so backtraces don't have bogus names
- if ( entry->n_sect() == 1 ) {
- newSymbolEntry->set_n_strx(fNewStringPool.addUnique("<redacted>"));
- ++symbolIndex;
- }
- // copy local symbol to unmmapped locals area
- unmappedSymbols.push_back(*entry);
- unmappedSymbols.back().set_n_strx(unmappedLocalsStringPool.addUnique(name));
- }
- else {
- newSymbolEntry->set_n_strx(fNewStringPool.addUnique(name));
- ++symbolIndex;
- }
- }
- }
- fLocalSymbolsCountInNewLinkEdit = symbolIndex - fLocalSymbolsStartIndexInNewLinkEdit;
- localInfo.nlistCount = unmappedSymbols.size() - localInfo.nlistStartIndex;
- dylibInfos.push_back(localInfo);
- //fprintf(stderr, "%u locals starting at %u for %s\n", fLocalSymbolsCountInNewLinkEdit, fLocalSymbolsStartIndexInNewLinkEdit, fLayout.getFilePath());
-}
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyExportedSymbols(uint32_t symbolTableOffset, uint32_t& symbolIndex)
-{
- fExportedSymbolsStartIndexInNewLinkEdit = symbolIndex;
- macho_nlist<P>* const newSymbolTableStart = (macho_nlist<P>*)(fNewLinkEditStart+symbolTableOffset);
- const macho_nlist<P>* const firstExport = &fSymbolTable[fDynamicSymbolTable->iextdefsym()];
- const macho_nlist<P>* const lastExport = &fSymbolTable[fDynamicSymbolTable->iextdefsym()+fDynamicSymbolTable->nextdefsym()];
- uint32_t oldIndex = fDynamicSymbolTable->iextdefsym();
- for (const macho_nlist<P>* entry = firstExport; entry < lastExport; ++entry, ++oldIndex) {
- if ( ((entry->n_type() & N_TYPE) == N_SECT) && (strncmp(&fStrings[entry->n_strx()], ".objc_", 6) != 0)
- && (strncmp(&fStrings[entry->n_strx()], "$ld$", 4) != 0) ) {
- macho_nlist<P>* newSymbolEntry = &newSymbolTableStart[symbolIndex];
- *newSymbolEntry = *entry;
- newSymbolEntry->set_n_strx(fNewStringPool.addUnique(&fStrings[entry->n_strx()]));
- fOldToNewSymbolIndexes[oldIndex] = symbolIndex-fLocalSymbolsStartIndexInNewLinkEdit;
- ++symbolIndex;
- }
- }
- fExportedSymbolsCountInNewLinkEdit = symbolIndex - fExportedSymbolsStartIndexInNewLinkEdit;
- //fprintf(stderr, "%u exports starting at %u for %s\n", fExportedSymbolsCountInNewLinkEdit, fExportedSymbolsStartIndexInNewLinkEdit, fLayout.getFilePath());
- // sort by name, so that dyld does not need a toc
- macho_nlist<P>* newSymbolsStart = &newSymbolTableStart[fExportedSymbolsStartIndexInNewLinkEdit];
- macho_nlist<P>* newSymbolsEnd = &newSymbolTableStart[fExportedSymbolsStartIndexInNewLinkEdit+fExportedSymbolsCountInNewLinkEdit];
- std::sort(newSymbolsStart, newSymbolsEnd, SymbolSorter<A>(fNewStringPool));
- //for (macho_nlist<P>* entry = newSymbolsStart; entry < newSymbolsEnd; ++entry)
- // fprintf(stderr, "\t%u\t %s\n", (entry-newSymbolsStart)+fExportedSymbolsStartIndexInNewLinkEdit, fNewStringPool.stringAtIndex(entry->n_strx()));
-}
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyImportedSymbols(uint32_t symbolTableOffset, uint32_t& symbolIndex)
-{
- fImportSymbolsStartIndexInNewLinkEdit = symbolIndex;
- macho_nlist<P>* const newSymbolTableStart = (macho_nlist<P>*)(fNewLinkEditStart+symbolTableOffset);
- const macho_nlist<P>* const firstImport = &fSymbolTable[fDynamicSymbolTable->iundefsym()];
- const macho_nlist<P>* const lastImport = &fSymbolTable[fDynamicSymbolTable->iundefsym()+fDynamicSymbolTable->nundefsym()];
- uint32_t oldIndex = fDynamicSymbolTable->iundefsym();
- for (const macho_nlist<P>* entry = firstImport; entry < lastImport; ++entry, ++oldIndex) {
- if ( ((entry->n_type() & N_TYPE) == N_UNDF) && (strncmp(&fStrings[entry->n_strx()], ".objc_", 6) != 0) ) {
- macho_nlist<P>* newSymbolEntry = &newSymbolTableStart[symbolIndex];
- *newSymbolEntry = *entry;
- newSymbolEntry->set_n_strx(fNewStringPool.addUnique(&fStrings[entry->n_strx()]));
- fOldToNewSymbolIndexes[oldIndex] = symbolIndex-fLocalSymbolsStartIndexInNewLinkEdit;
- ++symbolIndex;
- }
- }
- fImportedSymbolsCountInNewLinkEdit = symbolIndex - fImportSymbolsStartIndexInNewLinkEdit;
- //fprintf(stderr, "%u imports starting at %u for %s\n", fImportedSymbolsCountInNewLinkEdit, fImportSymbolsStartIndexInNewLinkEdit, fLayout.getFilePath());
- //macho_nlist<P>* newSymbolsStart = &((macho_nlist<P>*)fNewLinkEditStart)[fImportSymbolsStartIndexInNewLinkEdit];
- //macho_nlist<P>* newSymbolsEnd = &((macho_nlist<P>*)fNewLinkEditStart)[fImportSymbolsStartIndexInNewLinkEdit+fImportedSymbolsCountInNewLinkEdit];
- //for (macho_nlist<P>* entry = newSymbolsStart; entry < newSymbolsEnd; ++entry)
- // fprintf(stderr, "\t%u\t%s\n", (entry-newSymbolsStart)+fImportSymbolsStartIndexInNewLinkEdit, fNewStringPool.stringAtIndex(entry->n_strx()));
-}
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyExternalRelocations(uint32_t& offset)
-{
- fExternalRelocationsOffsetIntoNewLinkEdit = offset;
- const macho_relocation_info<P>* const relocsStart = (macho_relocation_info<P>*)(&fLinkEditBase[fDynamicSymbolTable->extreloff()]);
- const macho_relocation_info<P>* const relocsEnd = &relocsStart[fDynamicSymbolTable->nextrel()];
- for (const macho_relocation_info<P>* reloc=relocsStart; reloc < relocsEnd; ++reloc) {
- macho_relocation_info<P>* newReloc = (macho_relocation_info<P>*)(&fNewLinkEditStart[offset]);
- *newReloc = *reloc;
- uint32_t newSymbolIndex = fOldToNewSymbolIndexes[reloc->r_symbolnum()];
- //fprintf(stderr, "copyExternalRelocations() old=%d, new=%u name=%s in %s\n", reloc->r_symbolnum(), newSymbolIndex,
- // &fStrings[fSymbolTable[reloc->r_symbolnum()].n_strx()], fLayout.getFilePath());
- newReloc->set_r_symbolnum(newSymbolIndex);
- offset += sizeof(macho_relocation_info<P>);
- }
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::copyFunctionStarts(uint32_t& offset)
-{
- if ( fFunctionStarts != NULL ) {
- fFunctionStartsOffsetInNewLinkEdit = offset;
- memcpy(&fNewLinkEditStart[offset], &fLinkEditBase[fFunctionStarts->dataoff()], fFunctionStarts->datasize());
- offset += fFunctionStarts->datasize();
- }
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::copyDataInCode(uint32_t& offset)
-{
- if ( fDataInCode != NULL ) {
- fDataInCodeOffsetInNewLinkEdit = offset;
- memcpy(&fNewLinkEditStart[offset], &fLinkEditBase[fDataInCode->dataoff()], fDataInCode->datasize());
- offset += fDataInCode->datasize();
- }
-}
-
-
-template <typename A>
-void LinkEditOptimizer<A>::copyIndirectSymbolTable(uint32_t& offset)
-{
- fIndirectSymbolTableOffsetInfoNewLinkEdit = offset;
- const uint32_t* const indirectTable = (uint32_t*)&this->fLinkEditBase[fDynamicSymbolTable->indirectsymoff()];
- uint32_t* newIndirectTable = (uint32_t*)&fNewLinkEditStart[offset];
- for (int i=0; i < fDynamicSymbolTable->nindirectsyms(); ++i) {
- uint32_t oldSymbolIndex = E::get32(indirectTable[i]);
- uint32_t newSymbolIndex = oldSymbolIndex;
- if ( (oldSymbolIndex != INDIRECT_SYMBOL_ABS) && (oldSymbolIndex != INDIRECT_SYMBOL_LOCAL) ) {
- newSymbolIndex = fOldToNewSymbolIndexes[oldSymbolIndex];
- //fprintf(stderr, "copyIndirectSymbolTable() old=%d, new=%u name=%s in %s\n", oldSymbolIndex, newSymbolIndex,
- // &fStrings[fSymbolTable[oldSymbolIndex].n_strx()], fLayout.getFilePath());
- }
- E::set32(newIndirectTable[i], newSymbolIndex);
- }
- offset += (fDynamicSymbolTable->nindirectsyms() * 4);
-}
-
-template <typename A>
-void LinkEditOptimizer<A>::updateLoadCommands(uint64_t newVMAddress, uint64_t leSize, uint32_t stringPoolOffset,
- uint32_t linkEditsFileOffset, bool keepSignatures)
-{
- // set LINKEDIT segment commmand to new merged LINKEDIT
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* cmd = cmds;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
- macho_segment_command<P>* seg = (macho_segment_command<P>*)cmd;
- if ( strcmp(seg->segname(), "__LINKEDIT") == 0 ) {
- seg->set_vmaddr(newVMAddress);
- seg->set_vmsize(leSize);
- seg->set_filesize(leSize);
- seg->set_fileoff(linkEditsFileOffset);
- }
- else {
- pint_t oldFileOff = seg->fileoff();
- // don't alter __TEXT until <rdar://problem/7022345> is fixed
- if ( strcmp(seg->segname(), "__TEXT") != 0 ) {
- // update all other segments fileoff to be offset from start of cache file
- seg->set_fileoff(fSharedCache.cacheFileOffsetForVMAddress(seg->vmaddr()));
- }
- pint_t fileOffsetDelta = seg->fileoff() - oldFileOff;
- const MachOLayoutAbstraction::Segment* layoutSeg = fLayout.getSegment(seg->segname());
- if ( layoutSeg != NULL ) {
- //if ( seg->filesize() != layoutSeg->fileSize() ) {
- // fprintf(stderr, "LC filesize=0x%08llX, trimmed seg file size=0x%08llX, seg=%s, path=%s\n",
- // seg->filesize(), layoutSeg->fileSize(), seg->segname(), fLayout.getFilePath());
- //}
- //if ( seg->vmsize() != layoutSeg->size() ) {
- // fprintf(stderr, "LC vmsize=0x%08llX, trimmed seg size=0x%08llX, seg=%s, path=%s\n",
- // seg->vmsize(), layoutSeg->size(), seg->segname(), fLayout.getFilePath());
- //}
- seg->set_vmsize(layoutSeg->size());
- seg->set_filesize(layoutSeg->fileSize());
- }
- // update all sections in this segment
- macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)seg + sizeof(macho_segment_command<P>));
- macho_section<P>* const sectionsEnd = §ionsStart[seg->nsects()];
- for(macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- if ( sect->offset() != 0 )
- sect->set_offset(sect->offset()+fileOffsetDelta);
- //if ( (sect->flags() & SECTION_TYPE) == S_MOD_INIT_FUNC_POINTERS )
- // fprintf(stderr, "found initializer(s) in %s\n", fLayout.getFilePath());
- }
- }
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
-
- // update dyld_info with new offsets
- if ( fDyldInfo != NULL ) {
- fDyldInfo->set_rebase_off(0);
- fDyldInfo->set_rebase_size(0);
- fDyldInfo->set_bind_off(linkEditsFileOffset+fBindInfoOffsetIntoNewLinkEdit);
- fDyldInfo->set_bind_size(fBindInfoSizeInNewLinkEdit);
- fDyldInfo->set_weak_bind_off(linkEditsFileOffset+fWeakBindInfoOffsetIntoNewLinkEdit);
- fDyldInfo->set_weak_bind_size(fWeakBindInfoSizeInNewLinkEdit);
- fDyldInfo->set_lazy_bind_off(linkEditsFileOffset+fLazyBindInfoOffsetIntoNewLinkEdit);
- fDyldInfo->set_lazy_bind_size(fLazyBindInfoSizeInNewLinkEdit);
- fDyldInfo->set_export_off(linkEditsFileOffset+fExportInfoOffsetIntoNewLinkEdit);
- fDyldInfo->set_export_size(fExportInfoSizeInNewLinkEdit);
-
-// fprintf(stderr, "dylib %s\n", fLayout.getFilePath());
-// fprintf(stderr, " bind_off=0x%08X\n", fDyldInfo->bind_off());
-// fprintf(stderr, " export_off=0x%08X\n", fDyldInfo->export_off());
-// fprintf(stderr, " export_size=%d\n", fDyldInfo->export_size());
-
- }
-
- // update symbol table and dynamic symbol table with new offsets
- fSymbolTableLoadCommand->set_symoff(linkEditsFileOffset+fSymbolTableStartOffsetInNewLinkEdit);
- fSymbolTableLoadCommand->set_nsyms(fLocalSymbolsCountInNewLinkEdit+fExportedSymbolsCountInNewLinkEdit+fImportedSymbolsCountInNewLinkEdit);
- fSymbolTableLoadCommand->set_stroff(linkEditsFileOffset+stringPoolOffset);
- fSymbolTableLoadCommand->set_strsize(fNewStringPool.size());
- fDynamicSymbolTable->set_ilocalsym(0);
- fDynamicSymbolTable->set_nlocalsym(fLocalSymbolsCountInNewLinkEdit);
- fDynamicSymbolTable->set_iextdefsym(fExportedSymbolsStartIndexInNewLinkEdit-fLocalSymbolsStartIndexInNewLinkEdit);
- fDynamicSymbolTable->set_nextdefsym(fExportedSymbolsCountInNewLinkEdit);
- fDynamicSymbolTable->set_iundefsym(fImportSymbolsStartIndexInNewLinkEdit-fLocalSymbolsStartIndexInNewLinkEdit);
- fDynamicSymbolTable->set_nundefsym(fImportedSymbolsCountInNewLinkEdit);
- fDynamicSymbolTable->set_tocoff(0);
- fDynamicSymbolTable->set_ntoc(0);
- fDynamicSymbolTable->set_modtaboff(0);
- fDynamicSymbolTable->set_nmodtab(0);
- fDynamicSymbolTable->set_indirectsymoff(linkEditsFileOffset+fIndirectSymbolTableOffsetInfoNewLinkEdit);
- fDynamicSymbolTable->set_extreloff(linkEditsFileOffset+fExternalRelocationsOffsetIntoNewLinkEdit);
- fDynamicSymbolTable->set_locreloff(0);
- fDynamicSymbolTable->set_nlocrel(0);
-
- // update function starts
- if ( fFunctionStarts != NULL ) {
- fFunctionStarts->set_dataoff(linkEditsFileOffset+fFunctionStartsOffsetInNewLinkEdit);
- }
- // update data-in-code info
- if ( fDataInCode != NULL ) {
- fDataInCode->set_dataoff(linkEditsFileOffset+fDataInCodeOffsetInNewLinkEdit);
- }
-
- // now remove load commands no longer needed
- const macho_load_command<P>* srcCmd = cmds;
- macho_load_command<P>* dstCmd = (macho_load_command<P>*)cmds;
- int32_t newCount = 0;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- uint32_t cmdSize = srcCmd->cmdsize();
- switch ( srcCmd->cmd() ) {
- case LC_SEGMENT_SPLIT_INFO:
- case LC_DYLIB_CODE_SIGN_DRS:
- case LC_RPATH:
- // don't copy
- break;
- case LC_CODE_SIGNATURE:
- if ( !keepSignatures )
- break;
- // otherwise fall into copy case
- default:
- memmove(dstCmd, srcCmd, cmdSize);
- dstCmd = (macho_load_command<P>*)(((uint8_t*)dstCmd)+cmdSize);
- ++newCount;
- break;
- }
- srcCmd = (const macho_load_command<P>*)(((uint8_t*)srcCmd)+cmdSize);
- }
- // zero out stuff removed
- bzero(dstCmd, (uint8_t*)srcCmd - (uint8_t*)dstCmd);
-
- // update mach_header
- macho_header<P>* writableHeader = (macho_header<P>*)fHeader;
- writableHeader->set_ncmds(newCount);
- writableHeader->set_sizeofcmds((uint8_t*)dstCmd - ((uint8_t*)fHeader + sizeof(macho_header<P>)));
-
- // this invalidates some ivars
- fDynamicSymbolTable = NULL;
- fSymbolTableLoadCommand = NULL;
- fDyldInfo = NULL;
- fSymbolTable = NULL;
- fStrings = NULL;
-}
-
-
-
-template <typename A>
-uint8_t* SharedCache<A>::optimizeLINKEDIT(bool keepSignatures, bool dontMapLocalSymbols)
-{
- // allocate space for optimized LINKEDIT area
- uint8_t* newLinkEdit = new uint8_t[fLinkEditsTotalUnoptimizedSize];
- bzero(newLinkEdit, fLinkEditsTotalUnoptimizedSize);
-
- // make a string pool
- StringPool stringPool;
-
- // create optimizer object for each LINKEDIT segment
- std::vector<LinkEditOptimizer<A>*> optimizers;
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- optimizers.push_back(new LinkEditOptimizer<A>(*it->layout, *this, newLinkEdit, stringPool));
- }
-
- // rebase info is not copied because images in shared cache are never rebased
-
- // copy weak bind info
- uint32_t offset = 0;
- fOffsetOfWeakBindInfoInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyWeakBindInfo(offset);
- }
-
- // copy export info
- fOffsetOfExportInfoInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyExportInfo(offset);
- }
-
- // copy bind info
- fOffsetOfBindInfoInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyBindInfo(offset);
- }
-
- // copy lazy bind info
- fOffsetOfLazyBindInfoInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyLazyBindInfo(offset);
- }
-
- // copy symbol table entries
- fOffsetOfOldSymbolTableInfoInCombinedLinkedit = offset;
- uint32_t symbolTableOffset = offset;
- uint32_t symbolTableIndex = 0;
- if ( dontMapLocalSymbols )
- fUnmappedLocalSymbols.reserve(16384);
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyLocalSymbols(symbolTableOffset, symbolTableIndex, dontMapLocalSymbols, fInMemoryCache,
- fUnmappedLocalsStringPool, fUnmappedLocalSymbols, fLocalSymbolInfos);
- (*it)->copyExportedSymbols(symbolTableOffset, symbolTableIndex);
- (*it)->copyImportedSymbols(symbolTableOffset, symbolTableIndex);
- }
- fSizeOfOldSymbolTableInfoInCombinedLinkedit = symbolTableIndex * sizeof(macho_nlist<typename A::P>);
- offset = symbolTableOffset + fSizeOfOldSymbolTableInfoInCombinedLinkedit & (-8);
-
- // copy external relocations, 8-byte aligned after end of symbol table
- fOffsetOfOldExternalRelocationsInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyExternalRelocations(offset);
- }
- fSizeOfOldExternalRelocationsInCombinedLinkedit = offset - fOffsetOfOldExternalRelocationsInCombinedLinkedit;
-
- // copy function starts
- fOffsetOfFunctionStartsInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyFunctionStarts(offset);
- }
- fSizeOfFunctionStartsInCombinedLinkedit = offset - fOffsetOfFunctionStartsInCombinedLinkedit;
-
- // copy data-in-code info
- fOffsetOfDataInCodeInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyDataInCode(offset);
- }
- fSizeOfDataInCodeInCombinedLinkedit = offset - fOffsetOfDataInCodeInCombinedLinkedit;
-
- // copy indirect symbol tables
- fOffsetOfOldIndirectSymbolsInCombinedLinkedit = offset;
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->copyIndirectSymbolTable(offset);
- }
- fSizeOfOldIndirectSymbolsInCombinedLinkedit = offset - fOffsetOfOldIndirectSymbolsInCombinedLinkedit;
-
- // copy string pool
- fOffsetOfOldStringPoolInCombinedLinkedit = offset;
- memcpy(&newLinkEdit[offset], stringPool.getBuffer(), stringPool.size());
- fSizeOfOldStringPoolInCombinedLinkedit = stringPool.size();
-
- // total new size round up to page size
- fLinkEditsTotalOptimizedSize = pageAlign(fOffsetOfOldStringPoolInCombinedLinkedit + fSizeOfOldStringPoolInCombinedLinkedit);
-
- // choose new linkedit file offset
- uint32_t linkEditsFileOffset = cacheFileOffsetForVMAddress(fLinkEditsStartAddress);
-// uint32_t linkEditsFileOffset = fLinkEditsStartAddress - sharedRegionStartAddress();
-
- // update load commands so that all dylibs shared different areas of the same LINKEDIT segment
- for(typename std::vector<LinkEditOptimizer<A>*>::iterator it = optimizers.begin(); it != optimizers.end(); ++it) {
- (*it)->updateLoadCommands(fLinkEditsStartAddress, fLinkEditsTotalOptimizedSize, fOffsetOfOldStringPoolInCombinedLinkedit, linkEditsFileOffset, keepSignatures);
- }
-
- //fprintf(stderr, "fLinkEditsTotalUnoptimizedSize=%llu, fLinkEditsTotalOptimizedSize=%u\n", fLinkEditsTotalUnoptimizedSize, fLinkEditsTotalOptimizedSize);
- //printf(stderr, "mega link edit mapped starting at: %p\n", fFirstLinkEditSegment->mappedAddress());
-
- // overwrite mapped LINKEDIT area with new optimized LINKEDIT segment
- memcpy(fFirstLinkEditSegment->mappedAddress(), newLinkEdit, fLinkEditsTotalUnoptimizedSize);
-
- // update all LINKEDIT Segment objects to point to same merged LINKEDIT area
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- std::vector<MachOLayoutAbstraction::Segment>& segs = ((MachOLayoutAbstraction*)(it->layout))->getSegments();
- for(int i=0; i < segs.size(); ++i) {
- MachOLayoutAbstraction::Segment& seg = segs[i];
- if ( !seg.writable() && !seg.executable() && (strcmp(seg.name(), "__LINKEDIT") == 0) ) {
- seg.setNewAddress(fLinkEditsStartAddress);
- seg.setMappedAddress(fFirstLinkEditSegment->mappedAddress());
- seg.setSize(fLinkEditsTotalOptimizedSize);
- seg.setFileSize(fLinkEditsTotalOptimizedSize);
- seg.setFileOffset(linkEditsFileOffset);
- }
- }
- }
-
- // return new end of cache
- return (uint8_t*)fFirstLinkEditSegment->mappedAddress() + regionAlign(fLinkEditsTotalOptimizedSize);
-}
-
-
-template <typename A>
-class ObjCSelectorUniquer
-{
-private:
- objc_opt::string_map fSelectorStrings;
- SharedCache<A> *fCache;
- size_t fCount;
-
-public:
-
- ObjCSelectorUniquer(SharedCache<A> *newCache)
- : fSelectorStrings()
- , fCache(newCache)
- , fCount(0)
- { }
-
- typename A::P::uint_t visit(typename A::P::uint_t oldValue)
- {
- fCount++;
- const char *s = (const char *)
- fCache->mappedAddressForVMAddress(oldValue);
- objc_opt::string_map::iterator element =
- fSelectorStrings.insert(objc_opt::string_map::value_type(s, oldValue)).first;
- return (typename A::P::uint_t)element->second;
- }
-
- objc_opt::string_map& strings() {
- return fSelectorStrings;
- }
-
- size_t count() const { return fCount; }
-};
-
-
-template <typename A>
-class ClassListBuilder
-{
-private:
- typedef typename A::P P;
-
- objc_opt::string_map fClassNames;
- objc_opt::class_map fClasses;
- size_t fCount;
- HeaderInfoOptimizer<A>& fHinfos;
-
-public:
-
- ClassListBuilder(HeaderInfoOptimizer<A>& hinfos)
- : fClassNames()
- , fClasses()
- , fCount(0)
- , fHinfos(hinfos)
- { }
-
- void visitClass(SharedCache<A>* cache,
- const macho_header<P>* header,
- objc_class_t<A>* cls)
- {
- if (cls->isMetaClass(cache)) return;
-
- const char *name = cls->getName(cache);
- uint64_t name_vmaddr = cache->VMAddressForMappedAddress(name);
- uint64_t cls_vmaddr = cache->VMAddressForMappedAddress(cls);
- uint64_t hinfo_vmaddr = cache->VMAddressForMappedAddress(fHinfos.hinfoForHeader(cache, header));
- fClassNames.insert(objc_opt::string_map::value_type(name, name_vmaddr));
- fClasses.insert(objc_opt::class_map::value_type(name, std::pair<uint64_t, uint64_t>(cls_vmaddr, hinfo_vmaddr)));
- fCount++;
- }
-
- objc_opt::string_map& classNames() {
- return fClassNames;
- }
-
- objc_opt::class_map& classes() {
- return fClasses;
- }
-
- size_t count() const { return fCount; }
-};
-
-
-template <typename A>
-class ProtocolOptimizer
-{
-private:
- typedef typename A::P P;
- typedef typename A::P::uint_t pint_t;
-
- objc_opt::string_map fProtocolNames;
- objc_opt::protocol_map fProtocols;
- size_t fProtocolCount;
- size_t fProtocolReferenceCount;
-
- friend class ProtocolReferenceWalker<A, ProtocolOptimizer<A>>;
- pint_t visitProtocolReference(SharedCache<A>* cache, pint_t oldValue)
- {
- objc_protocol_t<A>* proto = (objc_protocol_t<A>*)
- cache->mappedAddressForVMAddress(oldValue);
- pint_t newValue = fProtocols[proto->getName(cache)];
- if (oldValue != newValue) fProtocolReferenceCount++;
- return newValue;
- }
-
-public:
-
- ProtocolOptimizer()
- : fProtocolNames()
- , fProtocols()
- , fProtocolCount(0)
- , fProtocolReferenceCount(0)
- { }
-
- void addProtocols(SharedCache<A>* cache,
- const macho_header<P>* header)
- {
- PointerSection<A, objc_protocol_t<A> *>
- protocols(cache, header, "__DATA", "__objc_protolist");
-
- for (pint_t i = 0; i < protocols.count(); i++) {
- objc_protocol_t<A> *proto = protocols.get(i);
-
- const char *name = proto->getName(cache);
- if (fProtocolNames.count(name) == 0) {
- // Need a Swift demangler API in OS before we can handle this
- if (0 == strncmp(name, "_TtP", 4)) {
- throw "objc protocol has Swift name";
- }
- if (proto->getSize() > sizeof(objc_protocol_t<A>)) {
- throw "objc protocol is too big";
- }
-
- uint64_t name_vmaddr = cache->VMAddressForMappedAddress(name);
- uint64_t proto_vmaddr = cache->VMAddressForMappedAddress(proto);
- fProtocolNames.insert(objc_opt::string_map::value_type(name, name_vmaddr));
- fProtocols.insert(objc_opt::protocol_map::value_type(name, proto_vmaddr));
- fProtocolCount++;
- }
- }
- }
-
- const char *writeProtocols(SharedCache<A>* cache,
- uint8_t *& dest, size_t& remaining,
- std::vector<void*>& pointersInData,
- pint_t protocolClassVMAddr)
- {
- if (fProtocolCount == 0) return NULL;
-
- if (protocolClassVMAddr == 0) {
- return "libobjc's Protocol class symbol not found (metadata not optimized)";
- }
-
- size_t required = fProtocolCount * sizeof(objc_protocol_t<A>);
- if (remaining < required) {
- return "libobjc's read-write section is too small (metadata not optimized)";
- }
-
- for (objc_opt::protocol_map::iterator iter = fProtocols.begin();
- iter != fProtocols.end();
- ++iter)
- {
- objc_protocol_t<A>* oldProto = (objc_protocol_t<A>*)
- cache->mappedAddressForVMAddress(iter->second);
-
- // Create a new protocol object.
- objc_protocol_t<A>* proto = (objc_protocol_t<A>*)dest;
- dest += sizeof(*proto);
- remaining -= 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<A>));
- // missing extendedMethodTypes is already nil
- }
- // Some protocol objects are big enough to have the
- // demangledName field but don't initialize it.
- if (! proto->getDemangledName(cache)) {
- proto->setDemangledName(cache, proto->getName(cache));
- }
- proto->setFixedUp();
-
- // Redirect the protocol table at our new object.
- iter->second = cache->VMAddressForMappedAddress(proto);
-
- // Add new rebase entries.
- proto->addPointers(pointersInData);
- }
-
- return NULL;
- }
-
- void updateReferences(SharedCache<A>* cache, const macho_header<P>* header)
- {
- ProtocolReferenceWalker<A, ProtocolOptimizer<A>> refs(*this);
- refs.walk(cache, header);
- }
-
- objc_opt::string_map& protocolNames() {
- return fProtocolNames;
- }
-
- objc_opt::protocol_map& protocols() {
- return fProtocols;
- }
-
- size_t protocolCount() const { return fProtocolCount; }
- size_t protocolReferenceCount() const { return fProtocolReferenceCount; }
-};
-
-
-static int percent(size_t num, size_t denom) {
- if (denom) return (int)(num / (double)denom * 100);
- else return 100;
-}
-
-template <typename A>
-void SharedCache<A>::optimizeObjC(std::vector<void*>& pointersInData)
-{
- const char *err;
-
- if ( verbose ) {
- fprintf(stderr, "update_dyld_shared_cache: for %s, optimizing objc metadata\n", archName());
- }
-
- size_t headerSize = P::round_up(sizeof(objc_opt::objc_opt_t));
- if (headerSize != sizeof(objc_opt::objc_opt_t)) {
- warn(archName(), "libobjc's optimization structure size is wrong (metadata not optimized)");
- }
-
- // Find libobjc's empty sections to fill in.
- // Find libobjc's list of pointers for us to use.
- const macho_section<P> *optROSection = NULL;
- const macho_section<P> *optRWSection = NULL;
- const macho_section<P> *optPointerListSection = NULL;
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- if ( strstr(it->layout->getFilePath(), "/libobjc.") != NULL ) {
- const macho_header<P>* mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- optROSection = mh->getSection("__TEXT", "__objc_opt_ro");
- optRWSection = mh->getSection("__DATA", "__objc_opt_rw");
- optPointerListSection = mh->getSection("__DATA", "__objc_opt_ptrs");
- break;
- }
- }
-
- if ( optROSection == NULL ) {
- warn(archName(), "libobjc's read-only section missing (metadata not optimized)");
- return;
- }
-
- if ( optRWSection == NULL ) {
- warn(archName(), "libobjc's read/write section missing (metadata not optimized)");
- return;
- }
-
- if ( optPointerListSection == NULL ) {
- warn(archName(), "libobjc's pointer list section missing (metadata not optimized)");
- return;
- }
-
- uint8_t* optROData = (uint8_t*)mappedAddressForVMAddress(optROSection->addr());
- size_t optRORemaining = optROSection->size();
-
- uint8_t* optRWData = (uint8_t*)mappedAddressForVMAddress(optRWSection->addr());
- size_t optRWRemaining = optRWSection->size();
-
- if (optRORemaining < headerSize) {
- warn(archName(), "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) {
- warn(archName(), "libobjc's read-only section version is unrecognized (metadata not optimized)");
- return;
- }
-
- if (optPointerListSection->size() < sizeof(objc_opt::objc_opt_pointerlist_tt<pint_t>)) {
- warn(archName(), "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> *)mappedAddressForVMAddress(optPointerListSection->addr());
-
- // Write nothing to optROHeader until everything else is written.
- // If something fails below, libobjc will not use the section.
-
- // Find objc-containing dylibs
- std::vector<LayoutInfo> objcDylibs;
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- macho_header<P> *mh = (macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- if (mh->getSection("__DATA", "__objc_imageinfo") || mh->getSegment("__OBJC")) {
- objcDylibs.push_back(*it);
- }
- }
-
- // Build image list
-
- // This is SAFE: the binaries themselves are unmodified.
-
- std::vector<LayoutInfo> addressSortedDylibs = objcDylibs;
- std::sort(addressSortedDylibs.begin(), addressSortedDylibs.end(), ByAddressSorter());
-
- uint64_t hinfoVMAddr = optRWSection->addr() + optRWSection->size() - optRWRemaining;
- HeaderInfoOptimizer<A> hinfoOptimizer;
- err = hinfoOptimizer.init(objcDylibs.size(), optRWData, optRWRemaining);
- if (err) {
- warn(archName(), err);
- return;
- }
- for(typename std::vector<LayoutInfo>::const_iterator it = addressSortedDylibs.begin(); it != addressSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- hinfoOptimizer.update(this, mh, pointersInData);
- }
-
-
- // 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 cstring data first.
- // This tries to localize selector cstring memory.
- ObjCSelectorUniquer<A> uniq(this);
- std::vector<LayoutInfo> sizeSortedDylibs = objcDylibs;
- std::sort(sizeSortedDylibs.begin(), sizeSortedDylibs.end(), ByCStringSectionSizeSorter());
-
- SelectorOptimizer<A, ObjCSelectorUniquer<A> > selOptimizer(uniq);
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- LegacySelectorUpdater<A, ObjCSelectorUniquer<A> >::update(this, mh, uniq);
- selOptimizer.optimize(this, mh);
- }
-
- uint64_t seloptVMAddr = optROSection->addr() + optROSection->size() - optRORemaining;
- objc_opt::objc_selopt_t *selopt = new(optROData) objc_opt::objc_selopt_t;
- err = selopt->write(seloptVMAddr, optRORemaining, uniq.strings());
- if (err) {
- warn(archName(), err);
- return;
- }
- optROData += selopt->size();
- optRORemaining -= selopt->size();
- selopt->byteswap(E::little_endian), selopt = NULL;
-
-
- // Build class table.
-
- // This is SAFE: the binaries themselves are unmodified.
-
- ClassListBuilder<A> classes(hinfoOptimizer);
- ClassWalker< A, ClassListBuilder<A> > classWalker(classes);
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- classWalker.walk(this, mh);
- }
-
- uint64_t clsoptVMAddr = optROSection->addr() + optROSection->size() - optRORemaining;
- objc_opt::objc_clsopt_t *clsopt = new(optROData) objc_opt::objc_clsopt_t;
- err = clsopt->write(clsoptVMAddr, optRORemaining,
- classes.classNames(), classes.classes(), verbose);
- if (err) {
- warn(archName(), err);
- return;
- }
- optROData += clsopt->size();
- optRORemaining -= clsopt->size();
- size_t duplicateCount = clsopt->duplicateCount();
- clsopt->byteswap(E::little_endian), clsopt = NULL;
-
-
- // Sort method lists.
-
- // This is SAFE: modified binaries are still usable as unsorted lists.
- // This must be done AFTER uniquing selectors.
-
- MethodListSorter<A> methodSorter;
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- macho_header<P> *mh = (macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- methodSorter.optimize(this, mh);
- }
-
-
- // Unique protocols and build protocol table.
-
- // This is SAFE: no protocol references are updated yet
- // This must be done AFTER updating method lists.
-
- ProtocolOptimizer<A> protocolOptimizer;
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- protocolOptimizer.addProtocols(this, mh);
- }
-
- pint_t protocolClassVMAddr = P::getP(optPointerList->protocolClass);
- err = protocolOptimizer.writeProtocols(this, optRWData, optRWRemaining,
- pointersInData, protocolClassVMAddr);
- if (err) {
- warn(archName(), err);
- return;
- }
-
- uint64_t protocoloptVMAddr = optROSection->addr() + optROSection->size() - optRORemaining;
- objc_opt::objc_protocolopt_t *protocolopt = new(optROData) objc_opt::objc_protocolopt_t;
- err = protocolopt->write(protocoloptVMAddr, optRORemaining,
- protocolOptimizer.protocolNames(),
- protocolOptimizer.protocols(), verbose);
- if (err) {
- warn(archName(), err);
- return;
- }
- optROData += protocolopt->size();
- optRORemaining -= protocolopt->size();
- protocolopt->byteswap(E::little_endian), protocolopt = NULL;
-
-
- // Redirect protocol references to the uniqued protocols.
-
- // This is SAFE: the new protocol objects are still usable as-is.
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- protocolOptimizer.updateReferences(this, mh);
- }
-
-
- // Repair ivar offsets.
-
- // This is SAFE: the runtime always validates ivar offsets at runtime.
-
- IvarOffsetOptimizer<A> ivarOffsetOptimizer;
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- ivarOffsetOptimizer.findGCClasses(this, mh);
- }
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- ivarOffsetOptimizer.optimize(this, mh);
- }
-
-
- // Success. Mark dylibs as optimized.
- for(typename std::vector<LayoutInfo>::const_iterator it = sizeSortedDylibs.begin(); it != sizeSortedDylibs.end(); ++it) {
- const macho_header<P> *mh = (const macho_header<P>*)(*it->layout).getSegments()[0].mappedAddress();
- const macho_section<P> *imageInfoSection;
- imageInfoSection = mh->getSection("__DATA", "__objc_imageinfo");
- if (!imageInfoSection) {
- imageInfoSection = mh->getSection("__OBJC", "__image_info");
- }
- if (imageInfoSection) {
- objc_image_info<A> *info = (objc_image_info<A> *)
- mappedAddressForVMAddress(imageInfoSection->addr());
- info->setOptimizedByDyld();
- }
- }
-
-
- // Success. Update RO header last.
- E::set32(optROHeader->selopt_offset, seloptVMAddr - optROSection->addr());
- E::set32(optROHeader->clsopt_offset, clsoptVMAddr - optROSection->addr());
- E::set32(optROHeader->protocolopt_offset, protocoloptVMAddr - optROSection->addr());
- E::set32(optROHeader->headeropt_offset, hinfoVMAddr - optROSection->addr());
-
- if ( verbose ) {
- size_t roSize = optROSection->size() - optRORemaining;
- size_t rwSize = optRWSection->size() - optRWRemaining;
- fprintf(stderr, "update_dyld_shared_cache: for %s, %zu/%llu bytes "
- "(%d%%) used in libobjc read-only optimization section\n",
- archName(), roSize, optROSection->size(),
- percent(roSize, optROSection->size()));
- fprintf(stderr, "update_dyld_shared_cache: for %s, %zu/%llu bytes "
- "(%d%%) used in libobjc read/write optimization section\n",
- archName(), rwSize, optRWSection->size(),
- percent(rwSize, optRWSection->size()));
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "uniqued %zu selectors\n",
- archName(), uniq.strings().size());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "updated %zu selector references\n",
- archName(), uniq.count());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "uniqued %zu protocols\n",
- archName(), protocolOptimizer.protocolCount());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "updated %zu protocol references\n",
- archName(), protocolOptimizer.protocolReferenceCount());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "updated %zu ivar offsets\n",
- archName(), ivarOffsetOptimizer.optimized());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "sorted %zu method lists\n",
- archName(), methodSorter.optimized());
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "recorded %zu classes (%zu duplicates)\n",
- archName(), classes.classNames().size(), duplicateCount);
- fprintf(stderr, "update_dyld_shared_cache: for %s, "
- "wrote objc metadata optimization version %d\n",
- archName(), objc_opt::VERSION);
- }
-
- return;
-}
-
-
-static const char* sCleanupFile = NULL;
-static void cleanup(int sig)
-{
- ::signal(sig, SIG_DFL);
- if ( sCleanupFile != NULL )
- ::unlink(sCleanupFile);
- //if ( verbose )
- // fprintf(stderr, "update_dyld_shared_cache: deleting temp file in response to a signal\n");
- if ( sig == SIGINT )
- ::exit(1);
-}
-
-
-// <rdar://problem/10730767> update_dyld_shared_cache should use sync_volume_np() instead of sync()
-static void sync_volume(const char* volumePath)
-{
-#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
- int error = sync_volume_np(volumePath, SYNC_VOLUME_FULLSYNC|SYNC_VOLUME_FULLSYNC);
-#else
- int full_sync = 3; // SYNC_VOLUME_FULLSYNC | SYNC_VOLUME_FULLSYNC
- int error = 0;
- if ( fsctl(volumePath, 0x80004101 /*FSCTL_SYNC_VOLUME*/, &full_sync, 0) == -1)
- error = errno;
-#endif
- if ( error )
- ::sync();
-}
-
-
-// <rdar://problem/12552226> update shared cache should sign the shared cache
-static bool adhoc_codesign_share_cache(const char* path)
-{
- CFURLRef target = ::CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8 *)path, strlen(path), FALSE);
- if ( target == NULL )
- return false;
-
- SecStaticCodeRef code;
- OSStatus status = ::SecStaticCodeCreateWithPath(target, kSecCSDefaultFlags, &code);
- CFRelease(target);
- if ( status ) {
- ::fprintf(stderr, "codesign: failed to create url to signed object\n");
- return false;
- }
-
- const void * keys[1] = { (void *)kSecCodeSignerIdentity } ;
- const void * values[1] = { (void *)kCFNull };
- CFDictionaryRef params = ::CFDictionaryCreate(NULL, keys, values, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
- if ( params == NULL ) {
- CFRelease(code);
- return false;
- }
-
- SecCodeSignerRef signer;
- status = ::SecCodeSignerCreate(params, kSecCSDefaultFlags, &signer);
- CFRelease(params);
- if ( status ) {
- CFRelease(code);
- ::fprintf(stderr, "codesign: failed to create signer object\n");
- return false;
- }
-
- status = ::SecCodeSignerAddSignatureWithErrors(signer, code, kSecCSDefaultFlags, NULL);
- CFRelease(code);
- CFRelease(signer);
- if ( status ) {
- ::fprintf(stderr, "codesign: failed to sign object: %s\n", path);
- return false;
- }
-
- if ( verbose )
- ::fprintf(stderr, "codesigning complete of %s\n", path);
-
- return true;
-}
-
-template <typename A>
-void SharedCache<A>::writeCacheFile(const char *cacheFilePath, uint8_t *cacheFileBuffer, uint32_t cacheFileSize, bool deleteOldCache) {
- char tempCachePath[strlen(cacheFilePath)+16];
- sprintf(tempCachePath, "%s.tmp%u", cacheFilePath, getpid());
-
- try {
- // install signal handlers to delete temp file if program is killed
- sCleanupFile = tempCachePath;
- ::signal(SIGINT, cleanup);
- ::signal(SIGBUS, cleanup);
- ::signal(SIGSEGV, cleanup);
-
- // compute UUID of whole cache
- uint8_t digest[16];
- CC_MD5(cacheFileBuffer, cacheFileSize, digest);
- // <rdar://problem/6723729> uuids should conform to RFC 4122 UUID version 4 & UUID version 5 formats
- digest[6] = ( digest[6] & 0x0F ) | ( 3 << 4 );
- digest[8] = ( digest[8] & 0x3F ) | 0x80;
- ((dyldCacheHeader<E>*)cacheFileBuffer)->set_uuid(digest);
-
- // create var/db/dyld dirs if needed
- char dyldDirs[1024];
- strcpy(dyldDirs, cacheFilePath);
- char* lastSlash = strrchr(dyldDirs, '/');
- if ( lastSlash != NULL )
- lastSlash[1] = '\0';
- struct stat stat_buf;
- if ( stat(dyldDirs, &stat_buf) != 0 ) {
- const char* afterSlash = &dyldDirs[1];
- char* slash;
- while ( (slash = strchr(afterSlash, '/')) != NULL ) {
- *slash = '\0';
- ::mkdir(dyldDirs, S_IRWXU | S_IRGRP|S_IXGRP | S_IROTH|S_IXOTH);
- *slash = '/';
- afterSlash = slash+1;
- }
- }
-
- // create temp file for cache
- int fd = ::open(tempCachePath, O_CREAT | O_RDWR | O_TRUNC, 0644);
- if ( fd == -1 )
- throwf("can't create temp file %s, errno=%d", tempCachePath, errno);
-
- // try to allocate whole cache file contiguously
- fstore_t fcntlSpec = { F_ALLOCATECONTIG|F_ALLOCATEALL, F_PEOFPOSMODE, 0, cacheFileSize, 0 };
- ::fcntl(fd, F_PREALLOCATE, &fcntlSpec);
-
- // write out cache file
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: writing cache to disk: %s\n", tempCachePath);
- if ( ::pwrite(fd, cacheFileBuffer, cacheFileSize, 0) != cacheFileSize )
- throwf("write() failure creating cache file, errno=%d", errno);
-
- // flush to disk and close
- int result = ::fcntl(fd, F_FULLFSYNC, NULL);
- if ( result == -1 )
- fprintf(stderr, "update_dyld_shared_cache: warning, fcntl(F_FULLFSYNC) failed with errno=%d for %s\n", errno, tempCachePath);
- result = ::close(fd);
- if ( result != 0 )
- fprintf(stderr, "update_dyld_shared_cache: warning, close() failed with errno=%d for %s\n", errno, tempCachePath);
-
- if ( !iPhoneOS )
- adhoc_codesign_share_cache(tempCachePath);
-
- if ( deleteOldCache ) {
- const char* pathLastSlash = strrchr(cacheFilePath, '/');
- if ( pathLastSlash != NULL ) {
- result = ::unlink(cacheFilePath);
- if ( result != 0 ) {
- if ( errno != ENOENT )
- fprintf(stderr, "update_dyld_shared_cache: warning, unable to remove existing cache %s because errno=%d\n", cacheFilePath, errno);
- }
- }
- }
-
- // move new cache file to correct location for use after reboot
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: atomically moving cache file into place: %s\n", cacheFilePath);
- result = ::rename(tempCachePath, cacheFilePath);
- if ( result != 0 )
- throwf("can't swap newly create dyld shared cache file: rename(%s,%s) returned errno=%d", tempCachePath, cacheFilePath, errno);
-
- // flush everything to disk to assure rename() gets recorded
- sync_volume(cacheFilePath);
-
- // restore default signal handlers
- ::signal(SIGINT, SIG_DFL);
- ::signal(SIGBUS, SIG_DFL);
- ::signal(SIGSEGV, SIG_DFL);
- }
- catch (...){
- // remove temp cache file
- ::unlink(tempCachePath);
- throw;
- }
-}
-
-
-template <> bool SharedCache<x86_64>::addCacheSlideInfo(){ return true; }
-template <> bool SharedCache<arm>::addCacheSlideInfo() { return true; }
-template <> bool SharedCache<x86>::addCacheSlideInfo() { return false; }
-template <> bool SharedCache<arm64>::addCacheSlideInfo() { return true; }
-
-
-template <typename A>
-bool SharedCache<A>::update(bool force, bool optimize, bool deleteExistingFirst, int archIndex,
- int archCount, bool keepSignatures, bool dontMapLocalSymbols)
-{
- bool didUpdate = false;
- bool canEmitDevelopmentCache = true;
- char devCacheFilePath[strlen(fCacheFilePath)+strlen(".development")];
- char fileListFilePath[strlen(fCacheFilePath)+strlen(".list")];
- sprintf(devCacheFilePath, "%s.development", fCacheFilePath);
- sprintf(fileListFilePath, "%s.list", fCacheFilePath);
- std::vector<const char *> paths;
-
- // already up to date?
- if ( force || fExistingIsNotUpToDate ) {
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: regenerating %s\n", fCacheFilePath);
- if ( fDylibs.size() == 0 ) {
- fprintf(stderr, "update_dyld_shared_cache: warning, empty cache not generated for arch %s\n", archName());
- return false;
- }
- // delete existing cache while building the new one
- // this is a flag to dyld to stop pinging update_dyld_shared_cache
- if ( deleteExistingFirst )
- ::unlink(fCacheFilePath);
- uint8_t* inMemoryCache = NULL;
- uint32_t allocatedCacheSize = 0;
- try {
- // allocate a memory block to hold cache
- uint32_t cacheFileSize = 0;
- for(std::vector<shared_file_mapping_np>::iterator it = fMappings.begin(); it != fMappings.end(); ++it) {
- uint32_t end = it->sfm_file_offset + it->sfm_size;
- if ( end > cacheFileSize )
- cacheFileSize = end;
- }
- if ( vm_allocate(mach_task_self(), (vm_address_t*)(&inMemoryCache), cacheFileSize, VM_FLAGS_ANYWHERE) != KERN_SUCCESS )
- throwf("can't vm_allocate cache of size %u", cacheFileSize);
- allocatedCacheSize = cacheFileSize;
- fInMemoryCache = inMemoryCache;
-
- // fill in header
- dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)inMemoryCache;
- const char* archPairName = fArchGraph->archName();
- char temp[16];
- strcpy(temp, "dyld_v1 ");
- strcpy(&temp[15-strlen(archPairName)], archPairName);
- header->set_magic(temp);
- //header->set_architecture(arch());
- header->set_mappingOffset(sizeof(dyldCacheHeader<E>));
- header->set_mappingCount(fMappings.size());
- header->set_imagesOffset(header->mappingOffset() + fMappings.size()*sizeof(dyldCacheFileMapping<E>));
- header->set_imagesCount(fDylibs.size()+fDylibAliases.size());
- header->set_dyldBaseAddress(fDyldBaseAddress);
- header->set_codeSignatureOffset(cacheFileSize);
- header->set_codeSignatureSize(0);
- header->set_slideInfoOffset(0);
- header->set_slideInfoSize(0);
- header->set_localSymbolsOffset(0);
- header->set_localSymbolsSize(0);
-
- // fill in mappings
- dyldCacheFileMapping<E>* mapping = (dyldCacheFileMapping<E>*)&inMemoryCache[sizeof(dyldCacheHeader<E>)];
- for(std::vector<shared_file_mapping_np>::iterator it = fMappings.begin(); it != fMappings.end(); ++it) {
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: cache mappings: address=0x%0llX, size=0x%0llX, fileOffset=0x%0llX, prot=0x%X\n",
- it->sfm_address, it->sfm_size, it->sfm_file_offset, it->sfm_init_prot);
- mapping->set_address(it->sfm_address);
- mapping->set_size(it->sfm_size);
- mapping->set_file_offset(it->sfm_file_offset);
- mapping->set_max_prot(it->sfm_max_prot);
- mapping->set_init_prot(it->sfm_init_prot);
- ++mapping;
- }
-
- // fill in image table
- dyldCacheImageInfo<E>* image = (dyldCacheImageInfo<E>*)mapping;
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- image->set_address(it->info.address);
- image->set_modTime(it->info.modTime);
- image->set_inode(it->info.inode);
- image->set_pathFileOffset(cacheFileOffsetForVMAddress(it->info.address+it->info.pathFileOffset));
- ++image;
- }
-
- // add aliases to end of image table
- for(typename std::vector<LayoutInfo>::iterator it = fDylibAliases.begin(); it != fDylibAliases.end(); ++it) {
- image->set_address(it->info.address);
- image->set_modTime(it->info.modTime);
- image->set_inode(it->info.inode);
- image->set_pathFileOffset(it->info.pathFileOffset);
- strcpy((char*)inMemoryCache+it->info.pathFileOffset, it->aliases[0]);
- //fprintf(stderr, "adding alias to offset 0x%08X %s\n", it->info.pathFileOffset, it->aliases[0]);
- ++image;
- }
-
- // copy each segment to cache buffer
- const int dylibCount = fDylibs.size();
- int dylibIndex = 0;
- int progressIndex = 0;
- bool foundLibSystem = false;
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it, ++dylibIndex) {
- const char* path = it->layout->getFilePath();
- int src = ::open(path, O_RDONLY, 0);
- if ( src == -1 )
- throwf("can't open file %s, errno=%d", it->layout->getID().name, errno);
- // mark source as "don't cache"
- (void)fcntl(src, F_NOCACHE, 1);
- // verify file has not changed since dependency analysis
- struct stat stat_buf;
- if ( fstat(src, &stat_buf) == -1)
- throwf("can't stat open file %s, errno=%d", path, errno);
- if ( (it->layout->getInode() != stat_buf.st_ino) )
- throwf("file inode changed from %llu to %llu during cache creation: %s", it->layout->getInode(), stat_buf.st_ino, path);
- else if ( it->layout->getLastModTime() != stat_buf.st_mtime )
- throwf("file mtime changed from 0x%lX to 0x%lX during cache creation: %s", it->layout->getLastModTime(), stat_buf.st_mtime, path);
- if ( strcmp(it->layout->getID().name, "/usr/lib/libSystem.B.dylib") == 0 )
- foundLibSystem = true;
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: copying %s to cache\n", it->layout->getFilePath());
- try {
- const std::vector<MachOLayoutAbstraction::Segment>& segs = it->layout->getSegments();
- for (int i=0; i < segs.size(); ++i) {
- const MachOLayoutAbstraction::Segment& seg = segs[i];
- if ( verbose ) {
- fprintf(stderr, "\t\tsegment %s, size=0x%0llX, cache address=0x%0llX, buffer address=%p\n",
- seg.name(), seg.size(), seg.newAddress(), &inMemoryCache[cacheFileOffsetForVMAddress(seg.newAddress())]);
- }
- if ( seg.size() > 0 ) {
- const uint64_t segmentSrcStartOffset = it->layout->getOffsetInUniversalFile()+seg.fileOffset();
- const uint64_t segmentSize = seg.fileSize();
- const uint64_t segmentDstStartOffset = cacheFileOffsetForVMAddress(seg.newAddress());
- ssize_t readResult = ::pread(src, &inMemoryCache[segmentDstStartOffset], segmentSize, segmentSrcStartOffset);
- if ( readResult != segmentSize ) {
- if ( readResult == -1 )
- throwf("read failure copying dylib errno=%d for %s", errno, it->layout->getID().name);
- else
- throwf("read failure copying dylib. Read of %lld bytes at file offset %lld returned %ld for %s",
- segmentSize, segmentSrcStartOffset, readResult, it->layout->getID().name);
- }
- }
- }
- }
- catch (const char* msg) {
- throwf("%s while copying %s to shared cache", msg, it->layout->getID().name);
- }
- ::close(src);
- paths.push_back(it->layout->getID().name);
- if ( progress ) {
- // assuming read takes 40% of time
- int nextProgressIndex = archIndex*100+(40*dylibIndex)/dylibCount;
- if ( nextProgressIndex != progressIndex )
- fprintf(stdout, "%3u/%u\n", nextProgressIndex, archCount*100);
- progressIndex = nextProgressIndex;
- }
- }
- if ( !foundLibSystem )
- throw "cache would be missing required dylib /usr/lib/libSystem.B.dylib";
-
- // set mapped address for each segment
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- std::vector<MachOLayoutAbstraction::Segment>& segs = ((MachOLayoutAbstraction*)(it->layout))->getSegments();
- for (int i=0; i < segs.size(); ++i) {
- MachOLayoutAbstraction::Segment& seg = segs[i];
- if ( seg.size() > 0 )
- seg.setMappedAddress(inMemoryCache + cacheFileOffsetForVMAddress(seg.newAddress()));
- //fprintf(stderr, "%s at %p to %p for %s\n", seg.name(), seg.mappedAddress(), (char*)seg.mappedAddress()+ seg.size(), it->layout->getID().name);
- }
- }
-
- // also construct list of all pointers in cache to other things in cache
- std::vector<void*> pointersInData;
- pointersInData.reserve(1024);
-
- // rebase each dylib in shared cache
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- try {
- Rebaser<A> r(*it->layout);
- if (!r.rebase(pointersInData)) {
- canEmitDevelopmentCache = false;
- fprintf(stderr, "update_dyld_shared_cache: Omitting development cache for %s, cannot rebase dylib into place for %s\n", archName(), it->layout->getID().name);
- }
- //if ( verbose )
- // fprintf(stderr, "update_dyld_shared_cache: for %s, rebasing dylib into cache for %s\n", archName(), it->layout->getID().name);
- }
- catch (const char* msg) {
- throwf("%s in %s", msg, it->layout->getID().name);
- }
- }
-
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: for %s, updating binding information for %lu files:\n", archName(), fDylibs.size());
- // instantiate a Binder for each image and add to map
- typename Binder<A>::Map map;
- std::vector<Binder<A>*> binders;
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- //fprintf(stderr, "binding %s\n", it->layout->getID().name);
- Binder<A>* binder = new Binder<A>(*it->layout);
- binders.push_back(binder);
- // only add dylibs to map
- if ( it->layout->getID().name != NULL )
- map[it->layout->getID().name] = binder;
- }
- // tell each Binder about the others
- for(typename std::vector<Binder<A>*>::iterator it = binders.begin(); it != binders.end(); ++it) {
- (*it)->setDependentBinders(map);
- }
- // perform binding
- for(typename std::vector<Binder<A>*>::iterator it = binders.begin(); it != binders.end(); ++it) {
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: for %s, updating binding information in cache for %s\n", archName(), (*it)->getDylibID());
- try {
- (*it)->bind(pointersInData);
- }
- catch (const char* msg) {
- throwf("%s in %s", msg, (*it)->getDylibID());
- }
- }
-
- for(typename std::vector<LayoutInfo>::iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- const macho_header<P>* fHeader = (const macho_header<P>*)it->layout->getSegments()[0].mappedAddress();
- const macho_load_command<P>* const cmds = (macho_load_command<P>*)((uint8_t*)fHeader + sizeof(macho_header<P>));
- const uint32_t cmd_count = fHeader->ncmds();
- const macho_load_command<P>* cmd = cmds;
- macho_dyld_info_command<P>* fDyldInfo;
- uint64_t originalLinkEditVMAddr = 0;
- for (uint32_t i = 0; i < cmd_count; ++i) {
- if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
- macho_segment_command<P>* seg = (macho_segment_command<P>*)cmd;
- if ( strcmp(seg->segname(), "__LINKEDIT") != 0 ) {
- pint_t oldFileOff = seg->fileoff();
- originalLinkEditVMAddr += seg->vmsize();
- // don't alter __TEXT until <rdar://problem/7022345> is fixed
- if ( strcmp(seg->segname(), "__TEXT") != 0 ) {
- // update all other segments fileoff to be offset from start of cache file
- seg->set_fileoff(cacheFileOffsetForVMAddress(seg->vmaddr()));
- }
- pint_t fileOffsetDelta = seg->fileoff() - oldFileOff;
- const MachOLayoutAbstraction::Segment* layoutSeg = it->layout->getSegment(seg->segname());
- if ( layoutSeg != NULL ) {
- seg->set_vmsize(layoutSeg->size());
- seg->set_filesize(layoutSeg->fileSize());
- }
- // update all sections in this segment
- macho_section<P>* const sectionsStart = (macho_section<P>*)((char*)seg + sizeof(macho_segment_command<P>));
- macho_section<P>* const sectionsEnd = §ionsStart[seg->nsects()];
- for(macho_section<P>* sect = sectionsStart; sect < sectionsEnd; ++sect) {
- if ( sect->offset() != 0 )
- sect->set_offset(sect->offset()+fileOffsetDelta);
- }
- }
- } else if (cmd->cmd() == LC_DYLD_INFO || cmd->cmd() == LC_DYLD_INFO_ONLY) {
- fDyldInfo = (macho_dyld_info_command<P>*)cmd;
- }
- cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
- }
- }
-
- // optimize binding
- for(typename std::vector<Binder<A>*>::iterator it = binders.begin(); it != binders.end(); ++it) {
- try {
- (*it)->optimize();
- }
- catch (const char* msg) {
- throwf("%s in %s", msg, (*it)->getDylibID());
- }
- }
-
- // delete binders
- for(typename std::vector<Binder<A>*>::iterator it = binders.begin(); it != binders.end(); ++it) {
- delete *it;
- }
-
- // merge/optimize all LINKEDIT segments
- if ( optimize ) {
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: original cache file size %uMB\n", cacheFileSize/(1024*1024));
- cacheFileSize = (this->optimizeLINKEDIT(keepSignatures, dontMapLocalSymbols) - inMemoryCache);
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: optimized cache file size %uMB\n", cacheFileSize/(1024*1024));
- // update header to reduce mapping size
- dyldCacheHeader<E>* cacheHeader = (dyldCacheHeader<E>*)inMemoryCache;
- dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&inMemoryCache[sizeof(dyldCacheHeader<E>)];
- dyldCacheFileMapping<E>* lastMapping = &mappings[cacheHeader->mappingCount()-1];
- lastMapping->set_size(cacheFileSize-lastMapping->file_offset());
- // update fMappings so .map file will print correctly
- fMappings.back().sfm_size = cacheFileSize-fMappings.back().sfm_file_offset;
- // update header
- //fprintf(stderr, "update_dyld_shared_cache: changing end of cache address from 0x%08llX to 0x%08llX\n",
- // header->codeSignatureOffset(), fMappings.back().sfm_address + fMappings.back().sfm_size);
- header->set_codeSignatureOffset(fMappings.back().sfm_file_offset + fMappings.back().sfm_size);
- }
-
- // dump dev cache with optimized linkedit, but not ObjC optimizations
- if (iPhoneOS && canEmitDevelopmentCache) {
- int fileListFD = ::open(fileListFilePath, O_WRONLY | O_CREAT | O_TRUNC, 0644);
- if ( fileListFD != -1 ) {
- for (const char* path : paths) {
- write(fileListFD, path, strlen(path)+1);
- write(fileListFD, "\n", 1);
- }
- close(fileListFD);
- }
-
- ((dyldCacheHeader<E>*)inMemoryCache)->set_cacheType(1);
- writeCacheFile(devCacheFilePath, inMemoryCache, cacheFileSize, fCacheFileInFinalLocation);
- }
-
- // unique objc selectors and update other objc metadata
- if ( optimize ) {
- optimizeObjC(pointersInData);
- if ( progress ) {
- // assuming objc optimizations takes 15% of time
- fprintf(stdout, "%3u/%u\n", (archIndex+1)*55, archCount*100);
- }
- }
-
- if ( addCacheSlideInfo() ) {
- // build bitmap of which pointers need sliding
- uint8_t* const dataStart = &inMemoryCache[fMappings[1].sfm_file_offset]; // R/W mapping is always second
- uint8_t* const dataEnd = &inMemoryCache[fMappings[1].sfm_file_offset+fMappings[1].sfm_size];
- const int bitmapSize = (dataEnd - dataStart)/(4*8);
- uint8_t* bitmap = (uint8_t*)calloc(bitmapSize, 1);
- void* lastPointer = inMemoryCache;
- for(std::vector<void*>::iterator pit=pointersInData.begin(); pit != pointersInData.end(); ++pit) {
- if ( *pit != lastPointer ) {
- void* p = *pit;
- if ( (p < dataStart) || ( p > dataEnd) )
- throwf("DATA pointer for sliding, out of range 0x%08lX\n", (long)((uint8_t*)p-inMemoryCache));
- long offset = (long)((uint8_t*)p - dataStart);
- if ( (offset % 4) != 0 )
- throwf("pointer not 4-byte aligned in DATA offset 0x%08lX\n", offset);
- long byteIndex = offset / (4*8);
- long bitInByte = (offset % 32) >> 2;
- bitmap[byteIndex] |= (1 << bitInByte);
- lastPointer = p;
- }
- }
-
- // allocate worst case size block of all slide info
- const int entry_size = 4096/(8*4); // 8 bits per byte, possible pointer every 4 bytes.
- const int toc_count = bitmapSize/entry_size;
- int slideInfoSize = sizeof(dyldCacheSlideInfo<E>) + 2*toc_count + entry_size*(toc_count+1);
- dyldCacheSlideInfo<E>* slideInfo = (dyldCacheSlideInfo<E>*)calloc(slideInfoSize, 1);
- slideInfo->set_version(1);
- slideInfo->set_toc_offset(sizeof(dyldCacheSlideInfo<E>));
- slideInfo->set_toc_count(toc_count);
- slideInfo->set_entries_offset((slideInfo->toc_offset()+2*toc_count+127)&(-128));
- slideInfo->set_entries_count(0);
- slideInfo->set_entries_size(entry_size);
- // append each unique entry
- const dyldCacheSlideInfoEntry* bitmapAsEntries = (dyldCacheSlideInfoEntry*)bitmap;
- dyldCacheSlideInfoEntry* const entriesInSlidInfo = (dyldCacheSlideInfoEntry*)((char*)slideInfo+slideInfo->entries_offset());
- int entry_count = 0;
- for (int i=0; i < toc_count; ++i) {
- const dyldCacheSlideInfoEntry* thisEntry = &bitmapAsEntries[i];
- // see if it is same as one already added
- bool found = false;
- for (int j=0; j < entry_count; ++j) {
- if ( memcmp(thisEntry, &entriesInSlidInfo[j], entry_size) == 0 ) {
- //fprintf(stderr, "toc[%d] optimized to %d\n", i, j);
- slideInfo->set_toc(i, j);
- found = true;
- break;
- }
- }
- if ( ! found ) {
- // append to end
- memcpy(&entriesInSlidInfo[entry_count], thisEntry, entry_size);
- slideInfo->set_toc(i, entry_count++);
- }
- }
- slideInfo->set_entries_count(entry_count);
-
- int slideInfoPageSize = regionAlign(slideInfo->entries_offset() + entry_count*entry_size);
- cacheFileSize += slideInfoPageSize;
-
- // update mappings to increase RO size
- dyldCacheHeader<E>* cacheHeader = (dyldCacheHeader<E>*)inMemoryCache;
- dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&inMemoryCache[sizeof(dyldCacheHeader<E>)];
- dyldCacheFileMapping<E>* lastMapping = &mappings[cacheHeader->mappingCount()-1];
- lastMapping->set_size(lastMapping->size()+slideInfoPageSize);
-
- // update header to show location of slidePointers
- cacheHeader->set_slideInfoOffset(cacheHeader->codeSignatureOffset());
- cacheHeader->set_slideInfoSize(slideInfoPageSize);
- cacheHeader->set_codeSignatureOffset(cacheHeader->codeSignatureOffset()+slideInfoPageSize);
-
- // update fMappings so .map file will print correctly
- fMappings.back().sfm_size = cacheFileSize-fMappings.back().sfm_file_offset;
-
- // copy compressed into into buffer
- memcpy(&inMemoryCache[cacheHeader->slideInfoOffset()], slideInfo, slideInfoPageSize);
- }
-
- // append local symbol info in an unmapped region
- if ( dontMapLocalSymbols ) {
- uint32_t spaceAtEnd = allocatedCacheSize - cacheFileSize;
- uint32_t localSymbolsOffset = pageAlign(cacheFileSize);
- dyldCacheLocalSymbolsInfo<E>* infoHeader = (dyldCacheLocalSymbolsInfo<E>*)(&inMemoryCache[localSymbolsOffset]);
- const uint32_t entriesOffset = sizeof(dyldCacheLocalSymbolsInfo<E>);
- const uint32_t entriesCount = fLocalSymbolInfos.size();
- const uint32_t nlistOffset = entriesOffset + entriesCount * sizeof(dyldCacheLocalSymbolEntry<E>);
- const uint32_t nlistCount = fUnmappedLocalSymbols.size();
- const uint32_t stringsOffset = nlistOffset + nlistCount * sizeof(macho_nlist<P>);
- const uint32_t stringsSize = fUnmappedLocalsStringPool.size();
- if ( stringsOffset+stringsSize > spaceAtEnd )
- throwf("update_dyld_shared_cache[%u] for arch=%s, out of space for local symbols. Have 0x%X, Need 0x%X\n",
- getpid(), fArchGraph->archName(), spaceAtEnd, stringsOffset+stringsSize);
- // fill in local symbols info
- infoHeader->set_nlistOffset(nlistOffset);
- infoHeader->set_nlistCount(nlistCount);
- infoHeader->set_stringsOffset(stringsOffset);
- infoHeader->set_stringsSize(stringsSize);
- infoHeader->set_entriesOffset(entriesOffset);
- infoHeader->set_entriesCount(entriesCount);
- // copy info for each dylib
- dyldCacheLocalSymbolEntry<E>* entries = (dyldCacheLocalSymbolEntry<E>*)(&inMemoryCache[localSymbolsOffset+entriesOffset]);
- for (int i=0; i < entriesCount; ++i) {
- entries[i].set_dylibOffset(fLocalSymbolInfos[i].dylibOffset);
- entries[i].set_nlistStartIndex(fLocalSymbolInfos[i].nlistStartIndex);
- entries[i].set_nlistCount(fLocalSymbolInfos[i].nlistCount);
- }
- // copy nlists
- memcpy(&inMemoryCache[localSymbolsOffset+nlistOffset], &fUnmappedLocalSymbols[0], nlistCount*sizeof(macho_nlist<P>));
- // copy string pool
- memcpy(&inMemoryCache[localSymbolsOffset+stringsOffset], fUnmappedLocalsStringPool.getBuffer(), stringsSize);
-
- // update state
- fUnmappedLocalSymbolsSize = pageAlign(stringsOffset + stringsSize);
- cacheFileSize = regionAlign(localSymbolsOffset + fUnmappedLocalSymbolsSize);
-
- // update header to show location of slidePointers
- dyldCacheHeader<E>* cacheHeader = (dyldCacheHeader<E>*)inMemoryCache;
- cacheHeader->set_localSymbolsOffset(localSymbolsOffset);
- cacheHeader->set_localSymbolsSize(stringsOffset+stringsSize);
- cacheHeader->set_codeSignatureOffset(cacheFileSize);
- }
-
- // make sure after all optimizations, that whole cache file fits into shared region address range
- {
- dyldCacheHeader<E>* cacheHeader = (dyldCacheHeader<E>*)inMemoryCache;
- dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&inMemoryCache[cacheHeader->mappingOffset()];
- // <rdar://problem/16128830> incorporate code signature size into overflow check
- uint32_t estCodeSigSize = regionAlign(cacheFileSize/200); // guess 0.5% for code signature
- for (int i=0; i < cacheHeader->mappingCount(); ++i) {
- uint64_t endAddr = mappings[i].address() + mappings[i].size() + estCodeSigSize;
- if ( endAddr > (sharedRegionStartAddress() + sharedRegionSize()) ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, shared cache will not fit in shared regions address space. Overflow amount: %lluKB\n",
- getpid(), fArchGraph->archName(), (endAddr-(sharedRegionStartAddress() + sharedRegionSize()))/1024);
- }
- }
- }
-
- if ( fVerify ) {
- // if no existing cache, say so
- if ( fExistingCacheForVerification == NULL ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, could not verify because cache file does not exist in /var/db/dyld/\n",
- getpid(), archName());
- }
- // new cache is built, compare header entries
- const dyldCacheHeader<E>* newHeader = (dyldCacheHeader<E>*)inMemoryCache;
- const dyldCacheHeader<E>* oldHeader = (dyldCacheHeader<E>*)fExistingCacheForVerification;
- if ( newHeader->mappingCount() != oldHeader->mappingCount() ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, could not verify cache because caches have a different number of mappings\n",
- getpid(), archName());
- }
- const dyldCacheFileMapping<E>* newMappings = (dyldCacheFileMapping<E>*)&inMemoryCache[newHeader->mappingOffset()];
- const dyldCacheFileMapping<E>* oldMappings = (dyldCacheFileMapping<E>*)&fExistingCacheForVerification[oldHeader->mappingOffset()];
- for (int i=0; i < newHeader->mappingCount(); ++i) {
- if ( newMappings[i].address() != oldMappings[i].address() ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, could not verify cache because mapping %d starts at a different address 0x%0llX vs 0x%0llX\n",
- getpid(), archName(), i, newMappings[i].address(), oldMappings[i].address() );
- }
- if ( newMappings[i].size() != oldMappings[i].size() ) {
- throwf("update_dyld_shared_cache[%u] for arch=%s, could not verify cache because mapping %d has a different size\n",
- getpid(), archName(), i);
- }
- }
-
- //fprintf(stderr, "%s existing cache = %p\n", archName(), fExistingCacheForVerification);
- //fprintf(stderr, "%s new cache = %p\n", archName(), inMemoryCache);
- // compare content to existing cache page by page
- for (int offset=0; offset < cacheFileSize; offset += 4096) {
- if ( memcmp(&inMemoryCache[offset], &fExistingCacheForVerification[offset], 4096) != 0 ) {
- fprintf(stderr, "verifier found differences on page offset 0x%08X for %s:\n", offset, archName());
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it, ++dylibIndex) {
- const std::vector<MachOLayoutAbstraction::Segment>& segs = it->layout->getSegments();
- for(std::vector<MachOLayoutAbstraction::Segment>::const_iterator sit = segs.begin(); sit != segs.end(); ++sit) {
- const MachOLayoutAbstraction::Segment& seg = *sit;
- if ( (seg.mappedAddress() <= &inMemoryCache[offset]) && (&inMemoryCache[offset] < ((uint8_t*)seg.mappedAddress() + seg.fileSize())) ) {
- // all LINKEDITs point to the same region, so just print one
- if ( strcmp(seg.name(), "__LINKEDIT") == 0 )
- fprintf(stderr, " in merged LINKEDIT segment\n");
- else
- fprintf(stderr, " in segment %s of dylib %s\n", seg.name(), it->layout->getID().name);
- break;
- }
- }
- }
- for (int po=0; po < 4096; po += 16) {
- if ( memcmp(&inMemoryCache[offset+po], &fExistingCacheForVerification[offset+po], 16) != 0 ) {
- fprintf(stderr, " existing: 0x%08X: ", offset+po);
- for ( int j=0; j < 16; ++j)
- fprintf(stderr, " 0x%02X", fExistingCacheForVerification[offset+po+j]);
- fprintf(stderr, "\n");
- fprintf(stderr, " should be: 0x%08X: ", offset+po);
- for ( int j=0; j < 16; ++j)
- fprintf(stderr, " 0x%02X", inMemoryCache[offset+po+j]);
- fprintf(stderr, "\n");
- }
- }
- }
- }
- }
- else {
- ((dyldCacheHeader<E>*)inMemoryCache)->set_cacheType(0);
- writeCacheFile(fCacheFilePath, inMemoryCache, cacheFileSize, fCacheFileInFinalLocation);
- didUpdate = true;
- // generate human readable "map" file that shows the layout of the cache file
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: writing .map file to disk\n");
- char mapFilePath[strlen(fCacheFilePath)+16];
- sprintf(mapFilePath, "%s.map", fCacheFilePath);
- char tempMapFilePath[strlen(fCacheFilePath)+32];
- sprintf(tempMapFilePath, "%s.map%u", fCacheFilePath, getpid());
- FILE* fmap = ::fopen(tempMapFilePath, "w");
- if ( fmap == NULL ) {
- fprintf(stderr, "can't create map file %s, errno=%d", tempMapFilePath, errno);
- }
- else {
- for(std::vector<shared_file_mapping_np>::iterator it = fMappings.begin(); it != fMappings.end(); ++it) {
- const char* prot = "RW";
- if ( it->sfm_init_prot == (VM_PROT_EXECUTE|VM_PROT_READ) )
- prot = "EX";
- else if ( it->sfm_init_prot == VM_PROT_READ )
- prot = "RO";
- else if ( it->sfm_init_prot == (VM_PROT_EXECUTE|VM_PROT_WRITE|VM_PROT_READ) )
- prot = "WX";
- if ( it->sfm_size > 1024*1024 )
- fprintf(fmap, "mapping %s %4lluMB 0x%0llX -> 0x%0llX\n", prot, it->sfm_size/(1024*1024),
- it->sfm_address, it->sfm_address+it->sfm_size);
- else
- fprintf(fmap, "mapping %s %4lluKB 0x%0llX -> 0x%0llX\n", prot, it->sfm_size/1024,
- it->sfm_address, it->sfm_address+it->sfm_size);
- }
-
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX weak binding info\n",
- (fOffsetOfExportInfoInCombinedLinkedit-fOffsetOfWeakBindInfoInCombinedLinkedit)/1024,
- fLinkEditsStartAddress+fOffsetOfWeakBindInfoInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfExportInfoInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX export info\n",
- (fOffsetOfBindInfoInCombinedLinkedit-fOffsetOfExportInfoInCombinedLinkedit)/1024,
- fLinkEditsStartAddress+fOffsetOfExportInfoInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfBindInfoInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX binding info\n",
- (fOffsetOfLazyBindInfoInCombinedLinkedit-fOffsetOfBindInfoInCombinedLinkedit)/1024,
- fLinkEditsStartAddress+fOffsetOfBindInfoInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfLazyBindInfoInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX lazy binding info\n",
- (fOffsetOfOldSymbolTableInfoInCombinedLinkedit-fOffsetOfLazyBindInfoInCombinedLinkedit)/1024,
- fLinkEditsStartAddress+fOffsetOfLazyBindInfoInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfOldSymbolTableInfoInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uMB 0x%0llX -> 0x%0llX non-dyld symbol table size\n",
- (fSizeOfOldSymbolTableInfoInCombinedLinkedit)/(1024*1024),
- fLinkEditsStartAddress+fOffsetOfOldSymbolTableInfoInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfOldSymbolTableInfoInCombinedLinkedit+fSizeOfOldSymbolTableInfoInCombinedLinkedit);
- if ( fSizeOfFunctionStartsInCombinedLinkedit != 0 )
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX non-dyld functions starts size\n",
- fSizeOfFunctionStartsInCombinedLinkedit/1024,
- fLinkEditsStartAddress+fOffsetOfFunctionStartsInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfFunctionStartsInCombinedLinkedit+fSizeOfFunctionStartsInCombinedLinkedit);
- if ( fSizeOfDataInCodeInCombinedLinkedit != 0 )
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX non-dyld data-in-code info size\n",
- fSizeOfDataInCodeInCombinedLinkedit/1024,
- fLinkEditsStartAddress+fOffsetOfDataInCodeInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfDataInCodeInCombinedLinkedit+fSizeOfDataInCodeInCombinedLinkedit);
- if ( fSizeOfOldExternalRelocationsInCombinedLinkedit != 0 )
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX non-dyld external relocs size\n",
- fSizeOfOldExternalRelocationsInCombinedLinkedit/1024,
- fLinkEditsStartAddress+fOffsetOfOldExternalRelocationsInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfOldExternalRelocationsInCombinedLinkedit+fSizeOfOldExternalRelocationsInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uKB 0x%0llX -> 0x%0llX non-dyld indirect symbol table size\n",
- fSizeOfOldIndirectSymbolsInCombinedLinkedit/1024,
- fLinkEditsStartAddress+fOffsetOfOldIndirectSymbolsInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfOldIndirectSymbolsInCombinedLinkedit+fSizeOfOldIndirectSymbolsInCombinedLinkedit);
- fprintf(fmap, " linkedit %4uMB 0x%0llX -> 0x%0llX non-dyld string pool\n",
- (fSizeOfOldStringPoolInCombinedLinkedit)/(1024*1024),
- fLinkEditsStartAddress+fOffsetOfOldStringPoolInCombinedLinkedit,
- fLinkEditsStartAddress+fOffsetOfOldStringPoolInCombinedLinkedit+fSizeOfOldStringPoolInCombinedLinkedit);
-
- dyldCacheHeader<E>* cacheHeader = (dyldCacheHeader<E>*)inMemoryCache;
- if ( cacheHeader->slideInfoSize() != 0 ) {
- fprintf(fmap, " linkedit %4lluKB kernel slide info\n", (cacheHeader->slideInfoSize())/1024);
- }
-
- fprintf(fmap, "unmapped -- %4uMB local symbol info\n", fUnmappedLocalSymbolsSize/(1024*1024));
-
- uint64_t endMappingAddr = fMappings[2].sfm_address + fMappings[2].sfm_size;
- fprintf(fmap, "total map %4lluMB\n", (endMappingAddr - sharedRegionStartAddress())/(1024*1024));
- if ( sharedRegionStartWritableAddress(0) == 0x7FFF70000000LL ) {
- // x86_64 has different slide constraints
- uint64_t freeSpace = 256*1024*1024 - fMappings[1].sfm_size;
- fprintf(fmap, "r/w space %4lluMB -> %d bits of entropy for ASLR\n\n", freeSpace/(1024*1024), (int)log2(freeSpace/4096));
- }
- else {
- uint64_t freeSpace = sharedRegionStartAddress() + sharedRegionSize() - endMappingAddr;
- fprintf(fmap, "free space %4lluMB -> %d bits of entropy for ASLR\n\n", freeSpace/(1024*1024), (int)log2(freeSpace/4096));
- }
-
- for(typename std::vector<LayoutInfo>::const_iterator it = fDylibs.begin(); it != fDylibs.end(); ++it) {
- fprintf(fmap, "%s\n", it->layout->getID().name);
- for (std::vector<const char*>::const_iterator ait = it->aliases.begin(); ait != it->aliases.end(); ++ait)
- fprintf(fmap, "%s\n", *ait);
- const std::vector<MachOLayoutAbstraction::Segment>& segs = it->layout->getSegments();
- for (int i=0; i < segs.size(); ++i) {
- const MachOLayoutAbstraction::Segment& seg = segs[i];
- fprintf(fmap, "\t%16s 0x%0llX -> 0x%0llX\n", seg.name(), seg.newAddress(), seg.newAddress()+seg.size());
- }
- }
- if ( warnings.size() > 0 ) {
- fprintf(fmap, "# Warnings:\n");
- for (std::vector<const char*>::iterator it=warnings.begin(); it != warnings.end(); ++it) {
- fprintf(fmap, "# %s\n", *it);
- }
- }
- fclose(fmap);
- ::rename(tempMapFilePath, mapFilePath);
- }
- }
-
- // free in memory cache
- vm_deallocate(mach_task_self(), (vm_address_t)inMemoryCache, allocatedCacheSize);
- inMemoryCache = NULL;
- if ( progress ) {
- // finished
- fprintf(stdout, "%3u/%u\n", (archIndex+1)*100, archCount*100);
- }
- }
- catch (...){
- // remove in memory cache
- if ( inMemoryCache != NULL )
- vm_deallocate(mach_task_self(), (vm_address_t)inMemoryCache, allocatedCacheSize);
- throw;
- }
- }
- return didUpdate;
-}
-
-
-
-//
-// The shared cache is driven by /var/db/dyld/shared_region_roots which contains
-// the paths used to search for dylibs that should go in the shared cache
-//
-// Leading and trailing white space is ignored
-// Blank lines are ignored
-// Lines starting with # are ignored
-//
-static void parsePathsFile(const char* filePath, std::vector<const char*>& paths)
-{
- // read in whole file
- int fd = open(filePath, O_RDONLY, 0);
- if ( fd == -1 ) {
- fprintf(stderr, "update_dyld_shared_cache: can't open file: %s\n", filePath);
- exit(1);
- }
- struct stat stat_buf;
- fstat(fd, &stat_buf);
- char* p = (char*)malloc(stat_buf.st_size);
- if ( p == NULL ) {
- fprintf(stderr, "update_dyld_shared_cache: malloc failure\n");
- exit(1);
- }
- if ( read(fd, p, stat_buf.st_size) != stat_buf.st_size ) {
- fprintf(stderr, "update_dyld_shared_cache: can't read file: %s\n", filePath);
- exit(1);
- }
- ::close(fd);
-
- // parse into paths and add to vector
- char * const end = &p[stat_buf.st_size];
- enum { lineStart, inSymbol, inComment } state = lineStart;
- char* symbolStart = NULL;
- for (char* s = p; s < end; ++s ) {
- switch ( state ) {
- case lineStart:
- if ( *s =='#' ) {
- state = inComment;
- }
- else if ( !isspace(*s) ) {
- state = inSymbol;
- symbolStart = s;
- }
- break;
- case inSymbol:
- if ( *s == '\n' ) {
- *s = '\0';
- // removing any trailing spaces
- char* last = s-1;
- while ( isspace(*last) ) {
- *last = '\0';
- --last;
- }
- paths.push_back(symbolStart);
- symbolStart = NULL;
- state = lineStart;
- }
- break;
- case inComment:
- if ( *s == '\n' )
- state = lineStart;
- break;
- }
- }
- // Note: we do not free() the malloc buffer, because the strings in it are used by exec()
-}
-
-
-
-static void setSharedDylibs(const char* rootPath, const std::vector<const char*>& overlayPaths, const std::set<ArchPair>& onlyArchs, std::vector<const char*> rootsPaths)
-{
- // set file system root
- ArchGraph::setFileSystemRoot(rootPath);
- ArchGraph::setFileSystemOverlay(overlayPaths);
-
- // initialize all architectures requested
- for(std::set<ArchPair>::iterator a = onlyArchs.begin(); a != onlyArchs.end(); ++a)
- ArchGraph::addArchPair(*a);
-
- // add roots to graph
- for(std::vector<const char*>::const_iterator it = rootsPaths.begin(); it != rootsPaths.end(); ++it)
- ArchGraph::addRoot(*it, onlyArchs);
-
- // determine shared dylibs
- for(std::set<ArchPair>::iterator a = onlyArchs.begin(); a != onlyArchs.end(); ++a)
- ArchGraph::findSharedDylibs(*a);
-}
-
-
-static void scanForSharedDylibs(const char* rootPath, const std::vector<const char*>& overlayPaths, const char* dirOfPathFiles, const std::set<ArchPair>& onlyArchs)
-{
- char rootDirOfPathFiles[strlen(rootPath)+strlen(dirOfPathFiles)+2];
- // in -root mode, look for roots in /rootpath/var/db/dyld
- if ( rootPath[0] != '\0' ) {
- strcpy(rootDirOfPathFiles, rootPath);
- strcat(rootDirOfPathFiles, dirOfPathFiles);
- dirOfPathFiles = rootDirOfPathFiles;
- }
-
- // extract all root paths from files in "/var/db/dyld/shared_region_roots/"
- if ( verbose )
- fprintf(stderr, "update_dyld_shared_cache: finding roots in: %s\n", dirOfPathFiles);
- std::vector<const char*> rootsPaths;
- DIR* dir = ::opendir(dirOfPathFiles);
- if ( dir == NULL )
- throwf("%s does not exist, errno=%d\n", dirOfPathFiles, errno);
- for (dirent* entry = ::readdir(dir); entry != NULL; entry = ::readdir(dir)) {
- if ( entry->d_type == DT_REG || entry->d_type == DT_UNKNOWN ) {
- // only look at regular files ending in .paths
- if ( strcmp(&entry->d_name[entry->d_namlen-6], ".paths") == 0 ) {
- struct stat tmpStatPathsFile;
- char fullPath[strlen(dirOfPathFiles)+entry->d_namlen+2];
- strcpy(fullPath, dirOfPathFiles);
- strcat(fullPath, "/");
- strcat(fullPath, entry->d_name);
- if ( lstat(fullPath, &tmpStatPathsFile) == -1 ) {
- fprintf(stderr, "update_dyld_shared_cache: can't access %s\n", fullPath);
- }
- else if ( S_ISREG(tmpStatPathsFile.st_mode) ) {
- parsePathsFile(fullPath, rootsPaths);
- }
- else {
- fprintf(stderr, "update_dyld_shared_cache: wrong file type for %s\n", fullPath);
- }
- }
- else {
- fprintf(stderr, "update_dyld_shared_cache: warning, ignore file with wrong extension: %s\n", entry->d_name);
- }
- }
- }
- ::closedir(dir);
-
- if ( rootsPaths.size() == 0 )
- fprintf(stderr, "update_dyld_shared_cache: warning, no entries found in shared_region_roots\n");
- setSharedDylibs(rootPath, overlayPaths, onlyArchs, rootsPaths);
-}
-
-static void setSharedDylibs(const char* rootPath, const std::vector<const char*>& overlayPaths, const char* pathsFile, const std::set<ArchPair>& onlyArchs)
-{
- std::vector<const char*> rootsPaths;
- parsePathsFile(pathsFile, rootsPaths);
- setSharedDylibs(rootPath, overlayPaths, onlyArchs, rootsPaths);
-}
-
-
-// If the 10.5.0 version of update_dyld_shared_cache was killed or crashed, it
-// could leave large half written cache files laying around. The function deletes
-// those files. To prevent the deletion of tmp files being created by another
-// copy of update_dyld_shared_cache, it only deletes the temp cache file if its
-// creation time was before the last restart of this machine.
-static void deleteOrphanTempCacheFiles()
-{
- DIR* dir = ::opendir(MACOSX_DYLD_SHARED_CACHE_DIR);
- if ( dir != NULL ) {
- std::vector<const char*> filesToDelete;
- for (dirent* entry = ::readdir(dir); entry != NULL; entry = ::readdir(dir)) {
- if ( entry->d_type == DT_REG ) {
- // only look at files with .tmp in name
- if ( strstr(entry->d_name, ".tmp") != NULL ) {
- char fullPath[strlen(MACOSX_DYLD_SHARED_CACHE_DIR)+entry->d_namlen+2];
- strcpy(fullPath, MACOSX_DYLD_SHARED_CACHE_DIR);
- strcat(fullPath, "/");
- strcat(fullPath, entry->d_name);
- struct stat tmpFileStatInfo;
- if ( stat(fullPath, &tmpFileStatInfo) != -1 ) {
- int mib[2] = {CTL_KERN, KERN_BOOTTIME};
- struct timeval boottime;
- size_t size = sizeof(boottime);
- if ( (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) && (boottime.tv_sec != 0) ) {
- // make sure this file is older than the boot time of this machine
- if ( tmpFileStatInfo.st_mtime < boottime.tv_sec ) {
- filesToDelete.push_back(strdup(fullPath));
- }
- }
- }
- }
- }
- }
- ::closedir(dir);
- for(std::vector<const char*>::iterator it = filesToDelete.begin(); it != filesToDelete.end(); ++it) {
- fprintf(stderr, "update_dyld_shared_cache: deleting old temp cache file: %s\n", *it);
- ::unlink(*it);
- }
- }
-}
-
-
-
-static bool updateSharedeCacheFile(const char* rootPath, const std::vector<const char*>& overlayPaths, const char* cacheDir, bool explicitCacheDir, const std::set<ArchPair>& onlyArchs,
- bool force, bool alphaSort, bool optimize, bool deleteExistingFirst, bool verify, bool keepSignatures, bool dontMapLocalSymbols)
-{
- bool didUpdate = false;
- // get dyld load address info
- UniversalMachOLayout* dyldLayout = NULL;
- char dyldPath[1024];
- strlcpy(dyldPath, rootPath, 1024);
- strlcat(dyldPath, "/usr/lib/dyld", 1024);
- struct stat stat_buf;
- if ( stat(dyldPath, &stat_buf) == 0 ) {
- dyldLayout = new UniversalMachOLayout(dyldPath, &onlyArchs);
- }
- else {
- dyldLayout = new UniversalMachOLayout("/usr/lib/dyld", &onlyArchs);
- }
- const int archCount = onlyArchs.size();
- int index = 0;
- for(std::set<ArchPair>::iterator a = onlyArchs.begin(); a != onlyArchs.end(); ++a, ++index) {
- const MachOLayoutAbstraction* dyldLayoutForArch = dyldLayout->getSlice(*a);
- uint64_t dyldBaseAddress = 0;
- if ( dyldLayoutForArch != NULL )
- dyldBaseAddress = dyldLayoutForArch->getBaseAddress();
- else
- fprintf(stderr, "update_dyld_shared_cache: warning, dyld not available for specified architectures\n");
- switch ( a->arch ) {
- case CPU_TYPE_I386:
- {
- SharedCache<x86> cache(ArchGraph::graphForArchPair(*a), rootPath, overlayPaths, cacheDir, explicitCacheDir, alphaSort, verify, optimize, dyldBaseAddress);
- didUpdate |= cache.update(force, optimize, deleteExistingFirst, index, archCount, keepSignatures, dontMapLocalSymbols);
- }
- break;
- case CPU_TYPE_X86_64:
- {
- SharedCache<x86_64> cache(ArchGraph::graphForArchPair(*a), rootPath, overlayPaths, cacheDir, explicitCacheDir, alphaSort, verify, optimize, dyldBaseAddress);
- didUpdate |= cache.update(force, optimize, deleteExistingFirst, index, archCount, keepSignatures, dontMapLocalSymbols);
- }
- break;
- case CPU_TYPE_ARM:
- {
- SharedCache<arm> cache(ArchGraph::graphForArchPair(*a), rootPath, overlayPaths, cacheDir, explicitCacheDir, alphaSort, verify, optimize, dyldBaseAddress);
- didUpdate |= cache.update(force, optimize, deleteExistingFirst, index, archCount, keepSignatures, dontMapLocalSymbols);
- }
- break;
- case CPU_TYPE_ARM64:
- {
- SharedCache<arm64> cache(ArchGraph::graphForArchPair(*a), rootPath, overlayPaths, cacheDir, explicitCacheDir, alphaSort, verify, optimize, dyldBaseAddress);
- didUpdate |= cache.update(force, optimize, deleteExistingFirst, index, archCount, keepSignatures, dontMapLocalSymbols);
- }
- break;
- }
- }
-
- if ( !iPhoneOS )
- deleteOrphanTempCacheFiles();
-
- return didUpdate;
-}
-
-
-static void usage()
-{
- fprintf(stderr, "update_dyld_shared_cache [-force] [-root dir] [-overlay dir] [-arch arch] [-debug]\n");
-}
-
-
-int main(int argc, const char* argv[])
-{
- std::set<ArchPair> onlyArchs;
- const char* rootPath = "";
- std::vector<const char*> overlayPaths;
- const char* dylibListFile = NULL;
- bool force = false;
- bool alphaSort = false;
- bool optimize = true;
- bool verify = false;
- bool keepSignatures = false;
- bool explicitCacheDir = false;
- bool dontMapLocalSymbols = false;
- bool relaunchForHaswell = false;
- const char* cacheDir = NULL;
-
- try {
- // parse command line options
- for(int i=1; i < argc; ++i) {
- const char* arg = argv[i];
- if ( arg[0] == '-' ) {
- if ( strcmp(arg, "-debug") == 0 ) {
- verbose = true;
- }
- else if ( strcmp(arg, "-force") == 0 ) {
- force = true;
- }
- else if ( strcmp(arg, "-verify") == 0 ) {
- verify = true;
- }
- else if ( strcmp(arg, "-sort_by_name") == 0 ) {
- alphaSort = true;
- }
- else if ( strcmp(arg, "-progress") == 0 ) {
- progress = true;
- }
- else if ( strcmp(arg, "-opt") == 0 ) {
- optimize = true;
- }
- else if ( strcmp(arg, "-no_opt") == 0 ) {
- optimize = false;
- }
- else if ( strcmp(arg, "-dont_map_local_symbols") == 0 ) {
- dontMapLocalSymbols = true;
- }
- else if ( strcmp(arg, "-iPhone") == 0 ) {
- iPhoneOS = true;
- alphaSort = true;
- }
- else if ( strcmp(arg, "-dylib_list") == 0 ) {
- dylibListFile = argv[++i];
- if ( dylibListFile == NULL )
- throw "-dylib_list missing path argument";
- }
- else if ( (strcmp(arg, "-root") == 0) || (strcmp(arg, "--root") == 0) ) {
- rootPath = argv[++i];
- if ( rootPath == NULL )
- throw "-root missing path argument";
- }
- else if ( strcmp(arg, "-overlay") == 0 ) {
- const char* path = argv[++i];
- if ( path == NULL )
- throw "-overlay missing path argument";
- overlayPaths.push_back(path);
- }
- else if ( strcmp(arg, "-cache_dir") == 0 ) {
- cacheDir = argv[++i];
- if ( cacheDir == NULL )
- throw "-cache_dir missing path argument";
- explicitCacheDir = true;
- }
- else if ( strcmp(arg, "-arch") == 0 ) {
- const char* arch = argv[++i];
- if ( strcmp(arch, "i386") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_I386, CPU_SUBTYPE_I386_ALL));
- else if ( strcmp(arch, "x86_64") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL));
- else if ( strcmp(arch, "x86_64h") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_H));
- else if ( strcmp(arch, "armv4t") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V4T));
- else if ( strcmp(arch, "armv5") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V5TEJ));
- else if ( strcmp(arch, "armv6") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6));
- else if ( strcmp(arch, "armv7") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7));
- else if ( strcmp(arch, "armv7f") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7F));
- else if ( strcmp(arch, "armv7k") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7K));
- else if ( strcmp(arch, "armv7s") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S));
- else if ( strcmp(arch, "arm64") == 0 )
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64_ALL));
- else
- throwf("unknown architecture %s", arch);
- }
- else if ( strcmp(arg, "-universal_boot") == 0 ) {
- onlyArchs.insert(ArchPair(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_ALL));
- onlyArchs.insert(ArchPair(CPU_TYPE_I386, CPU_SUBTYPE_I386_ALL));
- relaunchForHaswell = true;
- }
- else {
- usage();
- throwf("unknown option: %s\n", arg);
- }
- }
- else {
- usage();
- throwf("unknown option: %s\n", arg);
- }
- }
-
- // strip tailing slashes on -root
- // make it a real path so as to not make all dylibs look like symlink aliases
- if ( rootPath[0] != '\0' ) {
- char realRootPath[MAXPATHLEN];
- if ( realpath(rootPath, realRootPath) == NULL )
- throwf("realpath() failed on %s\n", rootPath);
- rootPath = strdup(realRootPath);
- }
-
- // strip tailing slashes on -overlay
- for (std::vector<const char*>::iterator it=overlayPaths.begin(); it != overlayPaths.end(); ++it) {
- char realOverlayPath[MAXPATHLEN];
- if ( realpath(*it, realOverlayPath) == NULL )
- throwf("realpath() failed on %s\n", *it);
- *it = strdup(realOverlayPath);
- }
-
- // set default location to write cache dir
- if ( cacheDir == NULL )
- cacheDir = (iPhoneOS ? IPHONE_DYLD_SHARED_CACHE_DIR : MACOSX_DYLD_SHARED_CACHE_DIR);
-
- // if no restrictions specified, use architectures that work on this machine
- if ( onlyArchs.size() == 0 ) {
- if ( iPhoneOS ) {
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6));
- onlyArchs.insert(ArchPair(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7));
- }
- else {
- int available;
- size_t len = sizeof(int);
- #if __i386__ || __x86_64__
- onlyArchs.insert(ArchPair(CPU_TYPE_I386, CPU_SUBTYPE_I386_ALL));
- // check system is capable of running 64-bit programs
- if ( (sysctlbyname("hw.optional.x86_64", &available, &len, NULL, 0) == 0) && available ) {
- // check system is capable of running x86_64h code
- struct host_basic_info info;
- mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
- mach_port_t hostPort = mach_host_self();
- kern_return_t result = host_info(hostPort, HOST_BASIC_INFO, (host_info_t)&info, &count);
- mach_port_deallocate(mach_task_self(), hostPort);
- if ( result != KERN_SUCCESS )
- throw "host_info() failed";
- if ( info.cpu_subtype == CPU_SUBTYPE_X86_64_H )
- onlyArchs.insert(ArchPair(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_H));
- else
- onlyArchs.insert(ArchPair(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_ALL));
- }
- #else
- #error unsupported architecture
- #endif
- }
- }
-
- if ( !verify && (geteuid() != 0) )
- throw "you must be root to run this tool";
-
- // build list of shared dylibs
- if ( dylibListFile != NULL )
- setSharedDylibs(rootPath, overlayPaths, dylibListFile, onlyArchs);
- else
- scanForSharedDylibs(rootPath, overlayPaths, "/var/db/dyld/shared_region_roots/", onlyArchs);
- bool didUpdate = updateSharedeCacheFile(rootPath, overlayPaths, cacheDir, explicitCacheDir, onlyArchs, force, alphaSort, optimize,
- false, verify, keepSignatures, dontMapLocalSymbols);
-
- if ( didUpdate && !iPhoneOS ) {
- void* handle = dlopen("/usr/lib/libspindump.dylib", RTLD_LAZY);
- if ( handle != NULL ) {
- typedef bool (*dscsym_proc_t)(const char *root);
- dscsym_proc_t proc = (dscsym_proc_t)dlsym(handle, "dscsym_save_nuggets_for_current_caches");
- const char* nuggetRootPath = "/";
- if ( !overlayPaths.empty() )
- nuggetRootPath = overlayPaths[0];
- else if ( rootPath[0] != '\0' )
- nuggetRootPath = rootPath;
- (*proc)(nuggetRootPath);
- }
- dlclose(handle);
- }
-
- if ( relaunchForHaswell ) {
- char cmd[2048];
- strlcpy(cmd, argv[0], 2048);
- strlcat(cmd, " -arch x86_64h", 2048);
- if ( force )
- strlcat(cmd, " -force", 2048);
- if ( verify )
- strlcat(cmd, " -verify", 2048);
- if ( alphaSort )
- strlcat(cmd, " -sort_by_name", 2048);
- if ( (rootPath != NULL) && (rootPath[0] != '\0') ) {
- strlcat(cmd, " -root ", 2048);
- strlcat(cmd, rootPath, 2048);
- }
- return system(cmd);
- }
-
- }
- catch (const char* msg) {
- fprintf(stderr, "update_dyld_shared_cache failed: %s\n", msg);
- return 1;
- }
-
- return 0;
-}
-
-
-