--- old/src/share/vm/classfile/classLoader.cpp 2016-09-14 11:20:33.970336146 -0700 +++ new/src/share/vm/classfile/classLoader.cpp 2016-09-14 11:20:33.851327778 -0700 @@ -85,6 +85,7 @@ typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); +typedef void (JNICALL *FreeEntry_t)(jzfile *zip, jzentry *entry); static ZipOpen_t ZipOpen = NULL; static ZipClose_t ZipClose = NULL; @@ -95,6 +96,7 @@ static canonicalize_fn_t CanonicalizeEntry = NULL; static ZipInflateFully_t ZipInflateFully = NULL; static Crc32_t Crc32 = NULL; +static FreeEntry_t FreeEntry = NULL; // Entry points for jimage.dll for loading jimage file entries @@ -150,6 +152,7 @@ GrowableArray* ClassLoader::_boot_modules_array = NULL; GrowableArray* ClassLoader::_platform_modules_array = NULL; SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; +int ClassLoader::_num_patch_mod_prefixes = 0; #endif // helper routines @@ -319,6 +322,20 @@ FREE_C_HEAP_ARRAY(char, _zip_name); } +bool ClassPathZipEntry::stream_exists(const char* name) { + // enable call to C land + JavaThread* thread = JavaThread::current(); + ThreadToNativeFromVM ttn(thread); + // check whether zip archive contains name + jint name_len, filesize; + jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len); + if (entry != NULL) { + (*FreeEntry)(_zip, entry); + return true; + } + return false; +} + u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { // enable call to C land JavaThread* thread = JavaThread::current(); @@ -693,8 +710,6 @@ GrowableArray* patch_mod_args = Arguments::get_patch_mod_prefix(); int num_of_entries = patch_mod_args->length(); - assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with --patch-module"); - assert(!UseSharedSpaces, "UseSharedSpaces not supported with --patch-module"); // Set up the boot loader's _patch_mod_entries list _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray(num_of_entries, true); @@ -1068,6 +1083,7 @@ GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); + FreeEntry = CAST_TO_FN_PTR(FreeEntry_t, os::dll_lookup(handle, "ZIP_FreeEntry")); // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || @@ -1395,6 +1411,61 @@ return NULL; } +#if INCLUDE_CDS +// The following function is only used during CDS dump time. +// It checks if a class can be found in the jar entries of the _patch_mod_entries. +// It does not support non-jar entries. +bool ClassLoader::is_in_patch_module(const char* const file_name) { + assert(DumpSharedSpaces, "dump time only"); + if (_patch_mod_entries == NULL) { + return false; + } + + int num_of_entries = _patch_mod_entries->length(); + char* class_module_name = NULL; + ResourceMark rm; + const char *pkg_name = package_from_name(file_name); + // Using the jimage to obtain the class' module name. + // The ModuleEntryTable cannot be used at this point during dump time + // because the module system hasn't been initialized yet. + if (pkg_name != NULL) { + JImageFile *jimage = _jrt_entry->jimage(); + class_module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name); + } + + if (class_module_name == NULL) { + return false; + } + + // Loop through all the patch module entries looking for module + for (int i = 0; i < num_of_entries; i++) { + ModuleClassPathList* module_cpl = _patch_mod_entries->at(i); + Symbol* module_cpl_name = module_cpl->module_name(); + + if (strcmp(module_cpl_name->as_C_string(), class_module_name) == 0) { + // Class' module has been located, attempt to locate + // the class from the module's ClassPathEntry list. + ClassPathEntry* e = module_cpl->module_first_entry(); + while (e != NULL) { + if (e->is_jar_file()) { + if (e->stream_exists(file_name)) { + return true; + } else { + e = e->next(); + } + } else { + if (DumpSharedSpaces) { + vm_exit_during_initialization("Only jar file in --patch-module is supported for CDS dumping ", e->name()); + } + } + } + } + } + + return false; +} +#endif // INCLUDE_CDS + instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { assert(name != NULL, "invariant"); assert(THREAD->is_Java_thread(), "must be a JavaThread"); @@ -1420,8 +1491,8 @@ // If DumpSharedSpaces is true boot loader visibility boundaries are set to: // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). - // No --patch-module entries or exploded module builds are included since CDS - // is not supported if --patch-module or exploded module builds are used. + // If a class is found in the --patch-module entries, the class will not be included in the + // CDS archive. Also, CDS is not supported if exploded module builds are used. // // If search_append_only is true, boot loader visibility boundaries are // set to be _first_append_entry to the end. This includes: @@ -1444,8 +1515,17 @@ // found within its module specification, the search should continue to Load Attempt #2. // Note: The --patch-module entries are never searched if the boot loader's // visibility boundary is limited to only searching the append entries. - if (_patch_mod_entries != NULL && !search_append_only && !DumpSharedSpaces) { - stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); + if (_patch_mod_entries != NULL && !search_append_only) { + if (!DumpSharedSpaces) { + stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); + } else { +#if INCLUDE_CDS + if (is_in_patch_module(file_name)) { + tty->print_cr("Preload Warning: Skip archiving class %s found in --patch-module entry", class_name); + return NULL; + } +#endif + } } // Load Attempt #2: [jimage | exploded build] @@ -1596,8 +1676,57 @@ } #if INCLUDE_CDS +// Capture all the --patch-module entries specified during CDS dump time. +// It also captures the non-existing path(s) and the required file(s) during inspecting +// the entries. +void ClassLoader::setup_patch_mod_path() { + assert(DumpSharedSpaces, "only used with -Xshare:dump"); + ResourceMark rm; + GrowableArray* patch_mod_args = Arguments::get_patch_mod_prefix(); + if (patch_mod_args != NULL) { + int num_of_entries = patch_mod_args->length(); + for (int i = 0; i < num_of_entries; i++) { + const char* module_name = (patch_mod_args->at(i))->module_name(); + const char* module_path = (patch_mod_args->at(i))->path_string(); + int path_len = (int)strlen(module_path); + int name_len = (int)strlen(module_name); + int buf_len = name_len + path_len + 2; // add 2 for the '=' and NULL terminator + int end = 0; + char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal); + // Iterate over the module's class path entries + for (int start = 0; start < path_len; start = end) { + while (module_path[end] && module_path[end] != os::path_separator()[0]) { + end++; + } + strncpy(buf, &module_path[start], end - start); + buf[end - start] = '\0'; + struct stat st; + if (os::stat(buf, &st) != 0) { + // File not found + _shared_paths_misc_info->add_nonexist_path(buf); + } else { + if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory + vm_exit_during_initialization( + "Cannot have directory in --patch-module during dumping", buf); + } else { + _shared_paths_misc_info->add_required_file(buf); + } + } + while (module_path[end] == os::path_separator()[0]) { + end++; + } + }; + jio_snprintf(buf, buf_len, "%s=%s", module_name, module_path); + _shared_paths_misc_info->add_patch_mod_classpath((const char*)buf); + _num_patch_mod_prefixes++; + FREE_C_HEAP_ARRAY(char, buf); + } + } +} + void ClassLoader::initialize_shared_path() { if (DumpSharedSpaces) { + setup_patch_mod_path(); ClassLoaderExt::setup_search_paths(); _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() }