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+++ dyld/dyld-851.27/dyld3/shared-cache/mrm_shared_cache_builder.cpp
@@ -0,0 +1,871 @@
+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+ *
+ * Copyright (c) 2017 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 "mrm_shared_cache_builder.h"
+#include "SharedCacheBuilder.h"
+#include "ClosureFileSystem.h"
+#include "FileUtils.h"
+#include "JSONReader.h"
+#include <pthread.h>
+#include <memory>
+#include <vector>
+#include <map>
+#include <sys/stat.h>
+
+
+static const uint64_t kMinBuildVersion = 1; //The minimum version BuildOptions struct we can support
+static const uint64_t kMaxBuildVersion = 2; //The maximum version BuildOptions struct we can support
+
+static const uint32_t MajorVersion = 1;
+static const uint32_t MinorVersion = 2;
+
+namespace dyld3 {
+namespace closure {
+
+struct FileInfo {
+ const char* path;
+ const uint8_t* data;
+ const uint64_t length;
+ FileFlags flags;
+ uint64_t mtime;
+ uint64_t inode;
+};
+
+class FileSystemMRM : public FileSystem {
+public:
+ FileSystemMRM() : FileSystem() { }
+
+ bool getRealPath(const char possiblePath[MAXPATHLEN], char realPath[MAXPATHLEN]) const override {
+ Diagnostics diag;
+ std::string resolvedPath = symlinkResolver.realPath(diag, possiblePath);
+ if (diag.hasError()) {
+ diag.verbose("MRM error: %s\n", diag.errorMessage().c_str());
+ diag.clearError();
+ return false;
+ }
+
+ // FIXME: Should we only return real paths of files which point to macho's? For now that is what we are doing
+ auto it = fileMap.find(resolvedPath);
+ if (it == fileMap.end())
+ return false;
+
+ memcpy(realPath, resolvedPath.c_str(), std::min((size_t)MAXPATHLEN, resolvedPath.size() + 1));
+ return true;
+ }
+
+ bool loadFile(const char* path, LoadedFileInfo& info, char realerPath[MAXPATHLEN], void (^error)(const char* format, ...)) const override {
+ Diagnostics diag;
+ std::string resolvedPath = symlinkResolver.realPath(diag, path);
+ if (diag.hasError()) {
+ diag.verbose("MRM error: %s\n", diag.errorMessage().c_str());
+ diag.clearError();
+ return false;
+ }
+
+ auto it = fileMap.find(resolvedPath);
+ if (it == fileMap.end())
+ return false;
+
+ if (resolvedPath == path)
+ realerPath[0] = '\0';
+ else
+ memcpy(realerPath, resolvedPath.c_str(), std::min((size_t)MAXPATHLEN, resolvedPath.size() + 1));
+
+ // The file exists at this exact path. Lets use it!
+ const FileInfo& fileInfo = files[it->second];
+
+ info.fileContent = fileInfo.data;
+ info.fileContentLen = fileInfo.length;
+ info.sliceOffset = 0;
+ info.sliceLen = fileInfo.length;
+ info.isOSBinary = true;
+ info.inode = fileInfo.inode;
+ info.mtime = fileInfo.mtime;
+ info.unload = nullptr;
+ info.path = path;
+ return true;
+ }
+
+ void unloadFile(const LoadedFileInfo& info) const override {
+ if (info.unload)
+ info.unload(info);
+ }
+
+ void unloadPartialFile(LoadedFileInfo& info, uint64_t keepStartOffset, uint64_t keepLength) const override {
+ // Note we don't actually unload the data here, but we do want to update the offsets for other data structures to track where we are
+ info.fileContent = (const void*)((char*)info.fileContent + keepStartOffset);
+ info.fileContentLen = keepLength;
+ }
+
+ bool fileExists(const char* path, uint64_t* inode=nullptr, uint64_t* mtime=nullptr,
+ bool* issetuid=nullptr, bool* inodesMatchRuntime = nullptr) const override {
+ Diagnostics diag;
+ std::string resolvedPath = symlinkResolver.realPath(diag, path);
+ if (diag.hasError()) {
+ diag.verbose("MRM error: %s\n", diag.errorMessage().c_str());
+ diag.clearError();
+ return false;
+ }
+
+ auto it = fileMap.find(resolvedPath);
+ if (it == fileMap.end())
+ return false;
+
+ // The file exists at this exact path. Lets use it!
+ const FileInfo& fileInfo = files[it->second];
+ if (inode)
+ *inode = fileInfo.inode;
+ if (mtime)
+ *mtime = fileInfo.mtime;
+ if (issetuid)
+ *issetuid = false;
+ if (inodesMatchRuntime)
+ *inodesMatchRuntime = false;
+ return true;
+ }
+
+ // MRM file APIs
+ bool addFile(const char* path, uint8_t* data, uint64_t size, Diagnostics& diag, FileFlags fileFlags) {
+ auto iteratorAndInserted = fileMap.insert(std::make_pair(path, files.size()));
+ if (!iteratorAndInserted.second) {
+ diag.error("Already have content for path: '%s'", path);
+ return false;
+ }
+
+ symlinkResolver.addFile(diag, path);
+ if (diag.hasError())
+ return false;
+
+ // on iOS, inode is just a placeholder
+ // Note its safe to just use the index here as we only compare it during closure building
+ // and never record it in the closures
+ uint64_t inode = files.size() + 1;
+ uint64_t mtime = 0;
+
+ files.push_back((FileInfo){ path, data, size, fileFlags, mtime, inode });
+ return true;
+ }
+
+ bool addSymlink(const char* fromPath, const char* toPath, Diagnostics& diag) {
+ symlinkResolver.addSymlink(diag, fromPath, toPath);
+ return !diag.hasError();
+ }
+
+ void forEachFileInfo(std::function<void(const char* path, FileFlags fileFlags)> lambda) {
+ for (const FileInfo& fileInfo : files)
+ lambda(fileInfo.path, fileInfo.flags);
+ }
+
+ size_t fileCount() const {
+ return files.size();
+ }
+
+ std::vector<DyldSharedCache::FileAlias> getResolvedSymlinks(Diagnostics& diag) {
+ return symlinkResolver.getResolvedSymlinks(diag);
+ }
+
+private:
+ std::vector<FileInfo> files;
+ std::map<std::string, uint64_t> fileMap;
+ SymlinkResolver symlinkResolver;
+};
+
+} // namespace closure
+} // namespace dyld3
+
+struct BuildInstance {
+ std::unique_ptr<DyldSharedCache::CreateOptions> options;
+ std::unique_ptr<SharedCacheBuilder> builder;
+ std::vector<CacheBuilder::InputFile> inputFiles;
+ std::vector<const char*> errors;
+ std::vector<const char*> warnings;
+ std::vector<std::string> errorStrings; // Owns the data for the errors
+ std::vector<std::string> warningStrings; // Owns the data for the warnings
+ uint8_t* cacheData = nullptr;
+ uint64_t cacheSize = 0;
+ std::string jsonMap;
+ std::string macOSMap; // For compatibility with update_dyld_shared_cache's .map file
+ std::string macOSMapPath; // Owns the string for the path
+ std::string cdHash; // Owns the data for the cdHash
+ std::string cdHashType; // Owns the data for the cdHashType
+ std::string uuid; // Owns the data for the uuid
+};
+
+struct BuildFileResult {
+ std::string path;
+ const uint8_t* data;
+ uint64_t size;
+};
+
+struct TranslationResult {
+ const uint8_t* data;
+ size_t size;
+ std::string cdHash;
+ std::string path;
+ bool bufferWasMalloced;
+};
+
+struct MRMSharedCacheBuilder {
+ MRMSharedCacheBuilder(const BuildOptions_v1* options);
+ const BuildOptions_v1* options;
+ dyld3::closure::FileSystemMRM fileSystem;
+
+ std::string dylibOrderFileData;
+ std::string dirtyDataOrderFileData;
+ void* objcOptimizationsFileData;
+ size_t objcOptimizationsFileLength;
+
+ // An array of builders and their options as we may have more than one builder for a given device variant.
+ std::vector<BuildInstance> builders;
+
+ // The paths in all of the caches
+ // We keep this here to own the std::string path data
+ std::map<std::string, std::unordered_set<const BuildInstance*>> dylibsInCaches;
+
+ // The results from all of the builders
+ // We keep this in a vector to own the data.
+ std::vector<FileResult*> fileResults;
+ std::vector<FileResult> fileResultStorage;
+ std::vector<std::pair<uint64_t, bool>> fileResultBuffers;
+
+ // The results from all of the builders
+ // We keep this in a vector to own the data.
+ std::vector<CacheResult*> cacheResults;
+ std::vector<CacheResult> cacheResultStorage;
+
+
+ // The files to remove. These are in every copy of the caches we built
+ std::vector<const char*> filesToRemove;
+
+ std::vector<const char*> errors;
+ std::vector<std::string> errorStorage;
+ pthread_mutex_t lock;
+
+ enum State {
+ AcceptingFiles,
+ Building,
+ FinishedBuilding
+ };
+
+ State state = AcceptingFiles;
+
+ void runSync(void (^block)()) {
+ pthread_mutex_lock(&lock);
+ block();
+ pthread_mutex_unlock(&lock);
+ }
+
+ __attribute__((format(printf, 2, 3)))
+ void error(const char* format, ...) {
+ va_list list;
+ va_start(list, format);
+ Diagnostics diag;
+ diag.error(format, list);
+ va_end(list);
+
+ errorStorage.push_back(diag.errorMessage());
+ errors.push_back(errorStorage.back().data());
+ }
+};
+
+MRMSharedCacheBuilder::MRMSharedCacheBuilder(const BuildOptions_v1* options)
+: options(options)
+, lock(PTHREAD_MUTEX_INITIALIZER)
+, objcOptimizationsFileData(nullptr)
+, objcOptimizationsFileLength(0)
+{
+
+}
+
+void validiateBuildOptions(const BuildOptions_v1* options, MRMSharedCacheBuilder& builder) {
+ if (options->version < kMinBuildVersion) {
+ builder.error("Builder version %llu is less than minimum supported version of %llu", options->version, kMinBuildVersion);
+ }
+ if (options->version > kMaxBuildVersion) {
+ builder.error("Builder version %llu is greater than maximum supported version of %llu", options->version, kMaxBuildVersion);
+ }
+ if (!options->updateName) {
+ builder.error("updateName must not be null");
+ }
+ if (!options->deviceName) {
+ builder.error("deviceName must not be null");
+ }
+ switch (options->disposition) {
+ case Disposition::Unknown:
+ case Disposition::InternalDevelopment:
+ case Disposition::Customer:
+ case Disposition::InternalMinDevelopment:
+ break;
+ default:
+ builder.error("unknown disposition value");
+ break;
+ }
+ switch (options->platform) {
+ case Platform::unknown:
+ builder.error("platform must not be unknown");
+ break;
+ case Platform::macOS:
+ case Platform::iOS:
+ case Platform::tvOS:
+ case Platform::watchOS:
+ case Platform::bridgeOS:
+ case Platform::iOSMac:
+ case Platform::iOS_simulator:
+ case Platform::tvOS_simulator:
+ case Platform::watchOS_simulator:
+ break;
+ default:
+ builder.error("unknown platform value");
+ break;
+ }
+ if (!options->archs) {
+ builder.error("archs must not be null");
+ }
+ if (!options->numArchs) {
+ builder.error("numArchs must not be 0");
+ }
+}
+
+void getVersion(uint32_t *major, uint32_t *minor) {
+ *major = MajorVersion;
+ *minor = MinorVersion;
+}
+
+struct MRMSharedCacheBuilder* createSharedCacheBuilder(const BuildOptions_v1* options) {
+ MRMSharedCacheBuilder* builder = new MRMSharedCacheBuilder(options);
+
+ // Check the option struct values are valid
+ validiateBuildOptions(options, *builder);
+
+ return builder;
+}
+
+bool addFile(struct MRMSharedCacheBuilder* builder, const char* path, uint8_t* data, uint64_t size, FileFlags fileFlags) {
+ __block bool success = false;
+ builder->runSync(^() {
+ if (builder->state != MRMSharedCacheBuilder::AcceptingFiles) {
+ builder->error("Cannot add file: '%s' as we have already started building", path);
+ return;
+ }
+ size_t pathLength = strlen(path);
+ if (pathLength == 0) {
+ builder->error("Empty path");
+ return;
+ }
+ if (pathLength >= MAXPATHLEN) {
+ builder->error("Path is too long: '%s'", path);
+ return;
+ }
+ if (data == nullptr) {
+ builder->error("Data cannot be null for file: '%s'", path);
+ return;
+ }
+ switch (fileFlags) {
+ case NoFlags:
+ case MustBeInCache:
+ case ShouldBeExcludedFromCacheIfUnusedLeaf:
+ case RequiredClosure:
+ break;
+ case DylibOrderFile:
+ builder->dylibOrderFileData = std::string((char*)data, size);
+ success = true;
+ return;
+ case DirtyDataOrderFile:
+ builder->dirtyDataOrderFileData = std::string((char*)data, size);
+ success = true;
+ return;
+ case ObjCOptimizationsFile:
+ builder->objcOptimizationsFileData = data;
+ builder->objcOptimizationsFileLength = size;
+ success = true;
+ return;
+ default:
+ builder->error("unknown file flags value");
+ break;
+ }
+ Diagnostics diag;
+ if (!builder->fileSystem.addFile(path, data, size, diag, fileFlags)) {
+ builder->errorStorage.push_back(diag.errorMessage());
+ builder->errors.push_back(builder->errorStorage.back().data());
+ return;
+ }
+ success = true;
+ });
+ return success;
+}
+
+bool addSymlink(struct MRMSharedCacheBuilder* builder, const char* fromPath, const char* toPath) {
+ __block bool success = false;
+ builder->runSync(^() {
+ if (builder->state != MRMSharedCacheBuilder::AcceptingFiles) {
+ builder->error("Cannot add file: '%s' as we have already started building", fromPath);
+ return;
+ }
+ size_t pathLength = strlen(fromPath);
+ if (pathLength == 0) {
+ builder->error("Empty path");
+ return;
+ }
+ if (pathLength >= MAXPATHLEN) {
+ builder->error("Path is too long: '%s'", fromPath);
+ return;
+ }
+ Diagnostics diag;
+ if (!builder->fileSystem.addSymlink(fromPath, toPath, diag)) {
+ builder->errorStorage.push_back(diag.errorMessage());
+ builder->errors.push_back(builder->errorStorage.back().data());
+ return;
+ }
+ success = true;
+ });
+ return success;
+}
+
+static DyldSharedCache::LocalSymbolsMode platformExcludeLocalSymbols(Platform platform) {
+ switch (platform) {
+ case Platform::unknown:
+ case Platform::macOS:
+ return DyldSharedCache::LocalSymbolsMode::keep;
+ case Platform::iOS:
+ case Platform::tvOS:
+ case Platform::watchOS:
+ case Platform::bridgeOS:
+ return DyldSharedCache::LocalSymbolsMode::unmap;
+ case Platform::iOSMac:
+ case Platform::iOS_simulator:
+ case Platform::tvOS_simulator:
+ case Platform::watchOS_simulator:
+ return DyldSharedCache::LocalSymbolsMode::keep;
+ }
+}
+
+static DyldSharedCache::LocalSymbolsMode excludeLocalSymbols(const BuildOptions_v1* options) {
+ if ( options->version >= 2 ) {
+ const BuildOptions_v2* v2 = (const BuildOptions_v2*)options;
+ if ( v2->optimizeForSize )
+ return DyldSharedCache::LocalSymbolsMode::strip;
+ }
+
+ // Old build options always use the platform default
+ return platformExcludeLocalSymbols(options->platform);
+}
+
+static bool optimizeDyldDlopens(const BuildOptions_v1* options) {
+ // Old builds always default to dyld3 optimisations
+ if ( options->version < 2 ) {
+ return true;
+ }
+
+ // If we want to optimize for size instead of speed, then disable dyld3 dlopen closures
+ const BuildOptions_v2* v2 = (const BuildOptions_v2*)options;
+ return !v2->optimizeForSize;
+}
+
+static DyldSharedCache::CodeSigningDigestMode platformCodeSigningDigestMode(Platform platform) {
+ switch (platform) {
+ case Platform::unknown:
+ case Platform::macOS:
+ case Platform::iOS:
+ case Platform::tvOS:
+ return DyldSharedCache::SHA256only;
+ case Platform::watchOS:
+ return DyldSharedCache::Agile;
+ case Platform::bridgeOS:
+ case Platform::iOSMac:
+ case Platform::iOS_simulator:
+ case Platform::tvOS_simulator:
+ case Platform::watchOS_simulator:
+ return DyldSharedCache::SHA256only;
+ }
+}
+
+static bool platformIsForSimulator(Platform platform) {
+ switch (platform) {
+ case Platform::unknown:
+ case Platform::macOS:
+ case Platform::iOS:
+ case Platform::tvOS:
+ case Platform::watchOS:
+ case Platform::bridgeOS:
+ case Platform::iOSMac:
+ return false;
+ case Platform::iOS_simulator:
+ case Platform::tvOS_simulator:
+ case Platform::watchOS_simulator:
+ return true;
+ }
+}
+
+static const char* dispositionName(Disposition disposition) {
+ switch (disposition) {
+ case Disposition::Unknown:
+ return "";
+ case Disposition::InternalDevelopment:
+ return "Internal";
+ case Disposition::Customer:
+ return "Customer";
+ case Disposition::InternalMinDevelopment:
+ return "InternalMinDevelopment";
+ }
+}
+
+// This is a JSON file containing the list of classes for which
+// we should try to build IMP caches.
+dyld3::json::Node parseObjcOptimizationsFile(Diagnostics& diags, const void* data, size_t length) {
+ return dyld3::json::readJSON(diags, data, length);
+}
+
+bool runSharedCacheBuilder(struct MRMSharedCacheBuilder* builder) {
+ __block bool success = false;
+ builder->runSync(^() {
+ if (builder->state != MRMSharedCacheBuilder::AcceptingFiles) {
+ builder->error("Builder has already been run");
+ return;
+ }
+ builder->state = MRMSharedCacheBuilder::Building;
+ if (builder->fileSystem.fileCount() == 0) {
+ builder->error("Cannot run builder with no files");
+ }
+
+ __block Diagnostics diag;
+ std::vector<DyldSharedCache::FileAlias> aliases = builder->fileSystem.getResolvedSymlinks(diag);
+ if (diag.hasError()) {
+ diag.verbose("Symlink resolver error: %s\n", diag.errorMessage().c_str());
+ }
+
+ if (!builder->errors.empty()) {
+ builder->error("Skipping running shared cache builder due to previous errors");
+ return;
+ }
+
+ __block std::vector<SharedCacheBuilder::InputFile> inputFiles;
+ builder->fileSystem.forEachFileInfo(^(const char* path, FileFlags fileFlags) {
+ SharedCacheBuilder::InputFile::State state = SharedCacheBuilder::InputFile::Unset;
+ switch (fileFlags) {
+ case FileFlags::NoFlags:
+ state = SharedCacheBuilder::InputFile::Unset;
+ break;
+ case FileFlags::MustBeInCache:
+ state = SharedCacheBuilder::InputFile::MustBeIncluded;
+ break;
+ case FileFlags::ShouldBeExcludedFromCacheIfUnusedLeaf:
+ state = SharedCacheBuilder::InputFile::MustBeExcludedIfUnused;
+ break;
+ case FileFlags::RequiredClosure:
+ state = SharedCacheBuilder::InputFile::MustBeIncluded;
+ break;
+ case FileFlags::DylibOrderFile:
+ case FileFlags::DirtyDataOrderFile:
+ case FileFlags::ObjCOptimizationsFile:
+ builder->error("Order files should not be in the file system");
+ return;
+ }
+ inputFiles.emplace_back((SharedCacheBuilder::InputFile){ path, state });
+ });
+
+ auto addCacheConfiguration = ^(bool isOptimized) {
+ for (uint64_t i = 0; i != builder->options->numArchs; ++i) {
+ // HACK: Skip i386 for macOS
+ if ( (builder->options->platform == Platform::macOS) && (strcmp(builder->options->archs[i], "i386") == 0 ) )
+ continue;
+ auto options = std::make_unique<DyldSharedCache::CreateOptions>((DyldSharedCache::CreateOptions){});
+ const char *cacheSuffix = (isOptimized ? "" : ".development");
+ if ( builder->options->platform == Platform::macOS )
+ cacheSuffix = "";
+ std::string runtimePath = (builder->options->platform == Platform::macOS) ? MACOSX_MRM_DYLD_SHARED_CACHE_DIR : IPHONE_DYLD_SHARED_CACHE_DIR;
+ options->outputFilePath = runtimePath + "dyld_shared_cache_" + builder->options->archs[i] + cacheSuffix;
+ options->outputMapFilePath = options->outputFilePath + ".json";
+ options->archs = &dyld3::GradedArchs::forName(builder->options->archs[i]);
+ options->platform = (dyld3::Platform)builder->options->platform;
+ options->localSymbolMode = excludeLocalSymbols(builder->options);
+ options->optimizeStubs = isOptimized;
+ options->optimizeDyldDlopens = optimizeDyldDlopens(builder->options);
+ options->optimizeDyldLaunches = true;
+ options->codeSigningDigestMode = platformCodeSigningDigestMode(builder->options->platform);
+ options->dylibsRemovedDuringMastering = true;
+ options->inodesAreSameAsRuntime = false;
+ options->cacheSupportsASLR = true;
+ options->forSimulator = platformIsForSimulator(builder->options->platform);
+ options->isLocallyBuiltCache = builder->options->isLocallyBuiltCache;
+ options->verbose = builder->options->verboseDiagnostics;
+ options->evictLeafDylibsOnOverflow = true;
+ options->loggingPrefix = std::string(builder->options->deviceName) + dispositionName(builder->options->disposition) + "." + builder->options->archs[i] + cacheSuffix;
+ options->dylibOrdering = parseOrderFile(builder->dylibOrderFileData);
+ options->dirtyDataSegmentOrdering = parseOrderFile(builder->dirtyDataOrderFileData);
+ options->objcOptimizations = parseObjcOptimizationsFile(diag, builder->objcOptimizationsFileData, builder->objcOptimizationsFileLength);
+
+ auto cacheBuilder = std::make_unique<SharedCacheBuilder>(*options.get(), builder->fileSystem);
+ builder->builders.emplace_back((BuildInstance) { std::move(options), std::move(cacheBuilder), inputFiles });
+ }
+ };
+
+ // Enqueue a cache for each configuration
+ switch (builder->options->disposition) {
+ case Disposition::Unknown:
+ case Disposition::InternalDevelopment:
+ // HACK: MRM for the mac should only get development, even if it requested both
+ if (builder->options->platform == Platform::macOS) {
+ addCacheConfiguration(false);
+ } else {
+ addCacheConfiguration(false);
+ addCacheConfiguration(true);
+ }
+ break;
+ case Disposition::Customer:
+ addCacheConfiguration(true);
+ break;
+ case Disposition::InternalMinDevelopment:
+ addCacheConfiguration(false);
+ break;
+ }
+
+ // FIXME: This step can run in parallel.
+ for (auto& buildInstance : builder->builders) {
+ SharedCacheBuilder* cacheBuilder = buildInstance.builder.get();
+ cacheBuilder->build(buildInstance.inputFiles, aliases);
+
+ // First put the warnings in to a vector to own them.
+ buildInstance.warningStrings.reserve(cacheBuilder->warnings().size());
+ for (const std::string& warning : cacheBuilder->warnings())
+ buildInstance.warningStrings.push_back(warning);
+
+ // Then copy to a vector to reference the owner
+ buildInstance.warnings.reserve(buildInstance.warningStrings.size());
+ for (const std::string& warning : buildInstance.warningStrings)
+ buildInstance.warnings.push_back(warning.c_str());
+
+ if (!cacheBuilder->errorMessage().empty()) {
+ // First put the errors in to a vector to own them.
+ buildInstance.errorStrings.push_back(cacheBuilder->errorMessage());
+
+ // Then copy to a vector to reference the owner
+ buildInstance.errors.reserve(buildInstance.errorStrings.size());
+ for (const std::string& error : buildInstance.errorStrings)
+ buildInstance.errors.push_back(error.c_str());
+ }
+
+ if (cacheBuilder->errorMessage().empty()) {
+ cacheBuilder->writeBuffer(buildInstance.cacheData, buildInstance.cacheSize);
+ buildInstance.jsonMap = cacheBuilder->getMapFileJSONBuffer(builder->options->deviceName);
+ if ( buildInstance.options->platform == dyld3::Platform::macOS ) {
+ // For compatibility with update_dyld_shared_cache, put a .map file next to the shared cache
+ buildInstance.macOSMap = cacheBuilder->getMapFileBuffer();
+ buildInstance.macOSMapPath = buildInstance.options->outputFilePath + ".map";
+ }
+ buildInstance.cdHash = cacheBuilder->cdHashFirst();
+ buildInstance.uuid = cacheBuilder->uuid();
+ switch (buildInstance.options->codeSigningDigestMode) {
+ case DyldSharedCache::SHA256only:
+ buildInstance.cdHashType = "sha256";
+ break;
+ case DyldSharedCache::SHA1only:
+ buildInstance.cdHashType = "sha1";
+ break;
+ case DyldSharedCache::Agile:
+ buildInstance.cdHashType = "sha1";
+ break;
+ }
+
+ // Track the dylibs which were included in this cache
+ cacheBuilder->forEachCacheDylib(^(const std::string &path) {
+ builder->dylibsInCaches[path.c_str()].insert(&buildInstance);
+ });
+ cacheBuilder->forEachCacheSymlink(^(const std::string &path) {
+ builder->dylibsInCaches[path.c_str()].insert(&buildInstance);
+ });
+ }
+ // Free the cache builder now so that we don't keep too much memory resident
+ cacheBuilder->deleteBuffer();
+ buildInstance.builder.reset();
+ }
+
+
+ // Now that we have run all of the builds, collect the results
+ // First push file results for each of the shared caches we built
+ for (auto& buildInstance : builder->builders) {
+ CacheResult cacheBuildResult;
+ cacheBuildResult.version = 1;
+ cacheBuildResult.loggingPrefix = buildInstance.options->loggingPrefix.c_str();
+ cacheBuildResult.deviceConfiguration = buildInstance.options->loggingPrefix.c_str();
+ cacheBuildResult.warnings = buildInstance.warnings.empty() ? nullptr : buildInstance.warnings.data();
+ cacheBuildResult.numWarnings = buildInstance.warnings.size();
+ cacheBuildResult.errors = buildInstance.errors.empty() ? nullptr : buildInstance.errors.data();
+ cacheBuildResult.numErrors = buildInstance.errors.size();
+ cacheBuildResult.uuidString = buildInstance.uuid.c_str();
+ cacheBuildResult.mapJSON = buildInstance.jsonMap.c_str();
+
+ builder->cacheResultStorage.emplace_back(cacheBuildResult);
+
+ if (!buildInstance.errors.empty())
+ continue;
+
+ FileResult cacheFileResult;
+ cacheFileResult.version = 1;
+ cacheFileResult.path = buildInstance.options->outputFilePath.c_str();
+ cacheFileResult.behavior = AddFile;
+ cacheFileResult.data = buildInstance.cacheData;
+ cacheFileResult.size = buildInstance.cacheSize;
+ cacheFileResult.hashArch = buildInstance.options->archs->name();
+ cacheFileResult.hashType = buildInstance.cdHashType.c_str();
+ cacheFileResult.hash = buildInstance.cdHash.c_str();
+
+ builder->fileResultBuffers.push_back({ builder->fileResultStorage.size(), true });
+ builder->fileResultStorage.emplace_back(cacheFileResult);
+
+ // Add a file result for the .map file
+ if ( !buildInstance.macOSMap.empty() ) {
+ FileResult cacheFileResult;
+ cacheFileResult.version = 1;
+ cacheFileResult.path = buildInstance.macOSMapPath.c_str();
+ cacheFileResult.behavior = AddFile;
+ cacheFileResult.data = (const uint8_t*)buildInstance.macOSMap.data();
+ cacheFileResult.size = buildInstance.macOSMap.size();
+ cacheFileResult.hashArch = buildInstance.options->archs->name();
+ cacheFileResult.hashType = buildInstance.cdHashType.c_str();
+ cacheFileResult.hash = buildInstance.cdHash.c_str();
+
+ builder->fileResultStorage.emplace_back(cacheFileResult);
+ }
+ }
+
+ // Copy from the storage to the vector we can return to the API.
+ for (auto &fileResult : builder->fileResultStorage)
+ builder->fileResults.push_back(&fileResult);
+ for (auto &cacheResult : builder->cacheResultStorage)
+ builder->cacheResults.push_back(&cacheResult);
+
+
+ // Add entries to tell us to remove all of the dylibs from disk which are in every cache.
+ const size_t numCaches = builder->builders.size();
+ for (const auto& dylibAndCount : builder->dylibsInCaches) {
+ const char* pathToRemove = dylibAndCount.first.c_str();
+
+ if ( builder->options->platform == Platform::macOS ) {
+ // macOS has to leave the simulator support binaries on disk
+ if ( strcmp(pathToRemove, "/usr/lib/system/libsystem_kernel.dylib") == 0 )
+ continue;
+ if ( strcmp(pathToRemove, "/usr/lib/system/libsystem_platform.dylib") == 0 )
+ continue;
+ if ( strcmp(pathToRemove, "/usr/lib/system/libsystem_pthread.dylib") == 0 )
+ continue;
+ }
+
+ if (dylibAndCount.second.size() == numCaches) {
+ builder->filesToRemove.push_back(pathToRemove);
+ } else {
+ // File is not in every cache, so likely has perhaps only x86_64h slice
+ // but we built both x86_64 and x86_64h caches.
+ // We may still delete it if its in all caches it's eligible for, ie, we
+ // assume the cache builder knows about all possible arch's on the system and
+ // can delete anything it knows can't run
+ bool canDeletePath = true;
+ for (auto& buildInstance : builder->builders) {
+ if ( dylibAndCount.second.count(&buildInstance) != 0 )
+ continue;
+ // This builder didn't get this image. See if the image was ineligible
+ // based on slide, ie, that dyld at runtime couldn't load this anyway, so
+ // so removing it from disk won't hurt
+ Diagnostics loaderDiag;
+ const dyld3::GradedArchs* archs = buildInstance.options->archs;
+ dyld3::Platform platform = buildInstance.options->platform;
+ char realerPath[MAXPATHLEN];
+ dyld3::closure::LoadedFileInfo fileInfo = dyld3::MachOAnalyzer::load(loaderDiag, builder->fileSystem,
+ pathToRemove, *archs, platform, realerPath);
+ if ( (platform == dyld3::Platform::macOS) && loaderDiag.hasError() ) {
+ // Try again with iOSMac
+ loaderDiag.clearError();
+ fileInfo = dyld3::MachOAnalyzer::load(loaderDiag, builder->fileSystem,
+ pathToRemove, *archs, dyld3::Platform::iOSMac, realerPath);
+ }
+
+ // We don't need the file content now, as we only needed to know if this file could be loaded
+ builder->fileSystem.unloadFile(fileInfo);
+
+ if ( loaderDiag.hasError() || (fileInfo.fileContent == nullptr) ) {
+ // This arch/platform combination couldn't load this path, so we can remove it
+ continue;
+ }
+
+ // This arch was compatible, so the dylib was rejected from this cache for some other reason, eg,
+ // cache overflow. We need to keep it on-disk
+ canDeletePath = false;
+ break;
+ }
+ if ( canDeletePath )
+ builder->filesToRemove.push_back(pathToRemove);
+ }
+ }
+
+ // Quit if we had any errors.
+ for (auto& buildInstance : builder->builders) {
+ if (!buildInstance.errors.empty())
+ return;
+ }
+
+ builder->state = MRMSharedCacheBuilder::FinishedBuilding;
+ success = true;
+ });
+ return success;
+}
+
+const char* const* getErrors(const struct MRMSharedCacheBuilder* builder, uint64_t* errorCount) {
+ if (builder->errors.empty())
+ return nullptr;
+ *errorCount = builder->errors.size();
+ return builder->errors.data();
+}
+
+const struct FileResult* const* getFileResults(struct MRMSharedCacheBuilder* builder, uint64_t* resultCount) {
+ if (builder->fileResults.empty())
+ return nullptr;
+ *resultCount = builder->fileResults.size();
+ return builder->fileResults.data();
+}
+
+const struct CacheResult* const* getCacheResults(struct MRMSharedCacheBuilder* builder, uint64_t* resultCount) {
+ if (builder->cacheResults.empty())
+ return nullptr;
+ *resultCount = builder->cacheResults.size();
+ return builder->cacheResults.data();
+}
+
+const char* const* getFilesToRemove(const struct MRMSharedCacheBuilder* builder, uint64_t* fileCount) {
+ if (builder->filesToRemove.empty())
+ return nullptr;
+ *fileCount = builder->filesToRemove.size();
+ return builder->filesToRemove.data();
+}
+
+void destroySharedCacheBuilder(struct MRMSharedCacheBuilder* builder) {
+ for (auto &indexAndIsDataMalloced : builder->fileResultBuffers) {
+ FileResult& fileResult = builder->fileResultStorage[indexAndIsDataMalloced.first];
+ if (indexAndIsDataMalloced.second) {
+ free((void*)fileResult.data);
+ } else {
+ vm_deallocate(mach_task_self(), (vm_address_t)fileResult.data, fileResult.size);
+ }
+ fileResult.data = nullptr;
+ }
+ delete builder;
+}