truffle: src/share/vm/classfile/classLoader.cpp comparison

comparison src/share/vm/classfile/classLoader.cpp @ 20375:6e0cb14ce59b

8046070: Class Data Sharing clean up and refactoring Summary: Cleaned up CDS to be more configurable, maintainable and extensible Reviewed-by: dholmes, coleenp, acorn, mchung

author	iklam
date	Thu, 21 Aug 2014 13:57:51 -0700
parents	78bbf4d43a14
children	bb239308be67

comparison

equal deleted inserted replaced

-:999824269b71
+:6e0cb14ce59b
 #include "precompiled.hpp"
 #include "classfile/classFileParser.hpp"
 #include "classfile/classFileStream.hpp"
 #include "classfile/classLoader.hpp"
+#include "classfile/classLoaderExt.hpp"
 #include "classfile/classLoaderData.inline.hpp"
 #include "classfile/javaClasses.hpp"
+#if INCLUDE_CDS
+#include "classfile/sharedPathsMiscInfo.hpp"
+#include "classfile/sharedClassUtil.hpp"
+#endif
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/bytecodeStream.hpp"
 #include "interpreter/oopMapCache.hpp"
 #include "memory/allocation.inline.hpp"
+#include "memory/filemap.hpp"
 #include "memory/generation.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceRefKlass.hpp"
 PerfCounter*    ClassLoader::_isUnsyncloadClass = NULL;
 PerfCounter*    ClassLoader::_load_instance_class_failCounter = NULL;
 ClassPathEntry* ClassLoader::_first_entry         = NULL;
 ClassPathEntry* ClassLoader::_last_entry          = NULL;
+int             ClassLoader::_num_entries         = 0;
 PackageHashtable* ClassLoader::_package_hash_table = NULL;
+#if INCLUDE_CDS
+SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
+#endif
 // helper routines
 bool string_starts_with(const char* str, const char* str_to_find) {
 size_t str_len = strlen(str);
 size_t str_to_find_len = strlen(str_to_find);
 if (str_to_find_len > str_len) {
 return NULL;
 }
 // check if file exists
 struct stat st;
 if (os::stat(path, &st) == 0) {
+#if INCLUDE_CDS
+if (DumpSharedSpaces) {
+// We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
+// we should never find a file underneath it -- unless user has added a new file while we are running
+// the dump, in which case let's quit!
+ShouldNotReachHere();
+}
+#endif
 // found file, open it
 int file_handle = os::open(path, 0, 0);
 if (file_handle != -1) {
 // read contents into resource array
 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
 (*ZipClose)(_zip);
 }
 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
 }
-ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
+u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
 // enable call to C land
 JavaThread* thread = JavaThread::current();
 ThreadToNativeFromVM ttn(thread);
 // check whether zip archive contains name
-jint filesize, name_len;
+jint name_len;
-jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
+jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
 if (entry == NULL) return NULL;
 u1* buffer;
 char name_buf[128];
 char* filename;
 if (name_len < 128) {
 filename = name_buf;
 } else {
 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
 }
-// file found, get pointer to class in mmaped jar file.
+// file found, get pointer to the entry in mmapped jar file.
 if (ReadMappedEntry == NULL ||
 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
-// mmaped access not available, perhaps due to compression,
+// mmapped access not available, perhaps due to compression,
 // read contents into resource array
-buffer     = NEW_RESOURCE_ARRAY(u1, filesize);
+int size = (*filesize) + ((nul_terminate) ? 1 : 0);
+buffer = NEW_RESOURCE_ARRAY(u1, size);
 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
+}
+// return result
+if (nul_terminate) {
+buffer[*filesize] = 0;
+}
+return buffer;
+}
+ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
+jint filesize;
+u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
+if (buffer == NULL) {
+return NULL;
 }
 if (UsePerfData) {
 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
 }
-// return result
+return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
-return new ClassFileStream(buffer, filesize, _zip_name);    // Resource allocated
 }
 // invoke function for each entry in the zip file
 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
 JavaThread* thread = JavaThread::current();
 if (ze == NULL) break;
 (*f)(ze->name, context);
 }
 }
-LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st) : ClassPathEntry() {
+LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
 _path = strdup(path);
 _st = *st;
 _meta_index = NULL;
 _resolved_entry = NULL;
 _has_error = false;
+_throw_exception = throw_exception;
 }
 bool LazyClassPathEntry::is_jar_file() {
 return ((_st.st_mode & S_IFREG) == S_IFREG);
 }
 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
 if (_resolved_entry != NULL) {
 return (ClassPathEntry*) _resolved_entry;
 }
 ClassPathEntry* new_entry = NULL;
-new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, CHECK_NULL);
+new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
+if (!_throw_exception && new_entry == NULL) {
+assert(!HAS_PENDING_EXCEPTION, "must be");
+return NULL;
+}
 {
 ThreadCritical tc;
 if (_resolved_entry == NULL) {
 _resolved_entry = new_entry;
 return new_entry;
 bool LazyClassPathEntry::is_lazy() {
 return true;
 }
+u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
+if (_has_error) {
+return NULL;
+}
+ClassPathEntry* cpe = resolve_entry(THREAD);
+if (cpe == NULL) {
+_has_error = true;
+return NULL;
+} else if (cpe->is_jar_file()) {
+return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
+} else {
+ShouldNotReachHere();
+*filesize = 0;
+return NULL;
+}
+}
 static void print_meta_index(LazyClassPathEntry* entry,
 GrowableArray<char*>& meta_packages) {
 tty->print("[Meta index for %s=", entry->name());
 for (int i = 0; i < meta_packages.length(); i++) {
 if (i > 0) tty->print(" ");
 tty->print("%s", meta_packages.at(i));
 }
 tty->print_cr("]");
 }
+#if INCLUDE_CDS
-void ClassLoader::setup_meta_index() {
+void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
+assert(DumpSharedSpaces, "only called at dump time");
+tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
+vm_exit_during_initialization(error, message);
+}
+#endif
+void ClassLoader::trace_class_path(const char* msg, const char* name) {
+if (!TraceClassPaths) {
+return;
+}
+if (msg) {
+tty->print("%s", msg);
+}
+if (name) {
+if (strlen(name) < 256) {
+tty->print("%s", name);
+} else {
+// For very long paths, we need to print each character separately,
+// as print_cr() has a length limit
+while (name[0] != '\0') {
+tty->print("%c", name[0]);
+name++;
+}
+}
+}
+if (msg && msg[0] == '[') {
+tty->print_cr("]");
+} else {
+tty->cr();
+}
+}
+void ClassLoader::setup_bootstrap_meta_index() {
 // Set up meta index which allows us to open boot jars lazily if
 // class data sharing is enabled
+const char* meta_index_path = Arguments::get_meta_index_path();
+const char* meta_index_dir  = Arguments::get_meta_index_dir();
+setup_meta_index(meta_index_path, meta_index_dir, 0);
+}
+void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
 const char* known_version = "% VERSION 2";
-char* meta_index_path = Arguments::get_meta_index_path();
-char* meta_index_dir  = Arguments::get_meta_index_dir();
 FILE* file = fopen(meta_index_path, "r");
 int line_no = 0;
+#if INCLUDE_CDS
+if (DumpSharedSpaces) {
+if (file != NULL) {
+_shared_paths_misc_info->add_required_file(meta_index_path);
+} else {
+_shared_paths_misc_info->add_nonexist_path(meta_index_path);
+}
+}
+#endif
 if (file != NULL) {
 ResourceMark rm;
 LazyClassPathEntry* cur_entry = NULL;
 GrowableArray<char*> boot_class_path_packages(10);
 char package_name[256];
 case '@':
 {
 // Hand off current packages to current lazy entry (if any)
 if ((cur_entry != NULL) &&
 (boot_class_path_packages.length() > 0)) {
-if (TraceClassLoading && Verbose) {
+if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 print_meta_index(cur_entry, boot_class_path_packages);
 }
 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 boot_class_path_packages.length());
 cur_entry->set_meta_index(index);
 }
 cur_entry = NULL;
 boot_class_path_packages.clear();
 // Find lazy entry corresponding to this jar file
-for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) {
+int count = 0;
-if (entry->is_lazy() &&
+for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
+if (count >= start_index &&
+entry->is_lazy() &&
 string_starts_with(entry->name(), meta_index_dir) &&
 string_ends_with(entry->name(), &package_name[2])) {
 cur_entry = (LazyClassPathEntry*) entry;
 break;
 }
 }
 }
 // Hand off current packages to current lazy entry (if any)
 if ((cur_entry != NULL) &&
 (boot_class_path_packages.length() > 0)) {
-if (TraceClassLoading && Verbose) {
+if ((TraceClassLoading || TraceClassPaths) && Verbose) {
 print_meta_index(cur_entry, boot_class_path_packages);
 }
 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
 boot_class_path_packages.length());
 cur_entry->set_meta_index(index);
 }
 fclose(file);
 }
 }
+#if INCLUDE_CDS
+void ClassLoader::check_shared_classpath(const char *path) {
+if (strcmp(path, "") == 0) {
+exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
+}
+struct stat st;
+if (os::stat(path, &st) == 0) {
+if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
+if (!os::dir_is_empty(path)) {
+tty->print_cr("Error: non-empty directory '%s'", path);
+exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
+}
+}
+}
+}
+#endif
 void ClassLoader::setup_bootstrap_search_path() {
 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
 char* sys_class_path = os::strdup(Arguments::get_sysclasspath());
-if (TraceClassLoading && Verbose) {
+if (!PrintSharedArchiveAndExit) {
-tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path);
+trace_class_path("[Bootstrap loader class path=", sys_class_path);
 }
+#if INCLUDE_CDS
-int len = (int)strlen(sys_class_path);
+if (DumpSharedSpaces) {
+_shared_paths_misc_info->add_boot_classpath(Arguments::get_sysclasspath());
+}
+#endif
+setup_search_path(sys_class_path);
+os::free(sys_class_path);
+}
+#if INCLUDE_CDS
+int ClassLoader::get_shared_paths_misc_info_size() {
+return _shared_paths_misc_info->get_used_bytes();
+}
+void* ClassLoader::get_shared_paths_misc_info() {
+return _shared_paths_misc_info->buffer();
+}
+bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
+SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
+bool result = checker->check();
+delete checker;
+return result;
+}
+#endif
+void ClassLoader::setup_search_path(char *class_path) {
+int offset = 0;
+int len = (int)strlen(class_path);
 int end = 0;
 // Iterate over class path entries
 for (int start = 0; start < len; start = end) {
-while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) {
+while (class_path[end] && class_path[end] != os::path_separator()[0]) {
 end++;
 }
-char* path = NEW_C_HEAP_ARRAY(char, end-start+1, mtClass);
+EXCEPTION_MARK;
-strncpy(path, &sys_class_path[start], end-start);
+ResourceMark rm(THREAD);
-path[end-start] = '\0';
+char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
+strncpy(path, &class_path[start], end - start);
+path[end - start] = '\0';
 update_class_path_entry_list(path, false);
-FREE_C_HEAP_ARRAY(char, path, mtClass);
+#if INCLUDE_CDS
-while (sys_class_path[end] == os::path_separator()[0]) {
+if (DumpSharedSpaces) {
+check_shared_classpath(path);
+}
+#endif
+while (class_path[end] == os::path_separator()[0]) {
 end++;
 }
 }
 }
-ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st, bool lazy, TRAPS) {
+ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st,
+bool lazy, bool throw_exception, TRAPS) {
 JavaThread* thread = JavaThread::current();
 if (lazy) {
-return new LazyClassPathEntry(path, st);
+return new LazyClassPathEntry(path, st, throw_exception);
 }
 ClassPathEntry* new_entry = NULL;
 if ((st->st_mode & S_IFREG) == S_IFREG) {
 // Regular file, should be a zip file
 // Canonicalized filename
 char canonical_path[JVM_MAXPATHLEN];
 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
 // This matches the classic VM
-THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
+if (throw_exception) {
+THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
+} else {
+return NULL;
+}
 }
 char* error_msg = NULL;
 jzfile* zip;
 {
 // enable call to C land
 HandleMark hm(thread);
 zip = (*ZipOpen)(canonical_path, &error_msg);
 }
 if (zip != NULL && error_msg == NULL) {
 new_entry = new ClassPathZipEntry(zip, path);
-if (TraceClassLoading) {
+if (TraceClassLoading || TraceClassPaths) {
 tty->print_cr("[Opened %s]", path);
 }
 } else {
 ResourceMark rm(thread);
 char *msg;
 } else {
 int len = (int)(strlen(path) + strlen(error_msg) + 128);
 msg = NEW_RESOURCE_ARRAY(char, len); ;
 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
 }
-THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
+if (throw_exception) {
+THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
+} else {
+return NULL;
+}
 }
 } else {
 // Directory
 new_entry = new ClassPathDirEntry(path);
-if (TraceClassLoading) {
+if (TraceClassLoading || TraceClassPaths) {
 tty->print_cr("[Path %s]", path);
 }
 }
 return new_entry;
 }
 } else {
 _last_entry->set_next(new_entry);
 _last_entry = new_entry;
 }
 }
-}
+_num_entries ++;
+}
-void ClassLoader::update_class_path_entry_list(char *path,
-bool check_for_duplicates) {
+// Returns true IFF the file/dir exists and the entry was successfully created.
+bool ClassLoader::update_class_path_entry_list(char *path,
+bool check_for_duplicates,
+bool throw_exception) {
 struct stat st;
 if (os::stat(path, &st) == 0) {
 // File or directory found
 ClassPathEntry* new_entry = NULL;
 Thread* THREAD = Thread::current();
-new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, CHECK);
+new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
+if (new_entry == NULL) {
+return false;
+}
 // The kernel VM adds dynamically to the end of the classloader path and
 // doesn't reorder the bootclasspath which would break java.lang.Package
 // (see PackageInfo).
 // Add new entry to linked list
 if (!check_for_duplicates || !contains_entry(new_entry)) {
-add_to_list(new_entry);
+ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
 }
+return true;
+} else {
+#if INCLUDE_CDS
+if (DumpSharedSpaces) {
+_shared_paths_misc_info->add_nonexist_path(path);
+}
+return false;
+#endif
 }
 }
 void ClassLoader::print_bootclasspath() {
 ClassPathEntry* e = _first_entry;
 }
 }
 assert(n == number_of_entries(), "just checking");
 }
-void copy_table(char** top, char* end, PackageHashtable* table);
+CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
 };
+#if INCLUDE_CDS
 void PackageHashtable::copy_table(char** top, char* end,
 PackageHashtable* table) {
 // Copy (relocate) the table to the shared space.
 BasicHashtable<mtClass>::copy_table(top, end);
 // Calculate the space needed for the package name strings.
 int i;
-int n = 0;
+intptr_t* tableSize = (intptr_t*)(*top);
-for (i = 0; i < table_size(); ++i) {
+*top += sizeof(intptr_t);  // For table size
-for (PackageInfo* pp = table->bucket(i);
+char* tableStart = *top;
-pp != NULL;
-pp = pp->next()) {
-n += (int)(strlen(pp->pkgname()) + 1);
-}
-}
-if (*top + n + sizeof(intptr_t) >= end) {
-report_out_of_shared_space(SharedMiscData);
-}
-// Copy the table data (the strings) to the shared space.
-n = align_size_up(n, sizeof(HeapWord));
-*(intptr_t*)(*top) = n;
-*top += sizeof(intptr_t);
 for (i = 0; i < table_size(); ++i) {
 for (PackageInfo* pp = table->bucket(i);
 pp != NULL;
 pp = pp->next()) {
 int n1 = (int)(strlen(pp->pkgname()) + 1);
+if (*top + n1 >= end) {
+report_out_of_shared_space(SharedMiscData);
+}
 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
 *top += n1;
 }
 }
 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
+if (*top >= end) {
+report_out_of_shared_space(SharedMiscData);
+}
+// Write table size
+intptr_t len = *top - (char*)tableStart;
+*tableSize = len;
 }
 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
 _package_hash_table->copy_buckets(top, end);
 }
 void ClassLoader::copy_package_info_table(char** top, char* end) {
 _package_hash_table->copy_table(top, end, _package_hash_table);
 }
+#endif
 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
 const char *cp = strrchr(pkgname, '/');
 if (cp != NULL) {
 // Package prefix found
 }
 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
 ResourceMark rm(THREAD);
-EventMark m("loading class %s", h_name->as_C_string());
+const char* class_name = h_name->as_C_string();
+EventMark m("loading class %s", class_name);
 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
 stringStream st;
 // st.print() uses too much stack space while handling a StackOverflowError
 // st.print("%s.class", h_name->as_utf8());
 st.print_raw(h_name->as_utf8());
 st.print_raw(".class");
-char* name = st.as_string();
+const char* file_name = st.as_string();
+ClassLoaderExt::Context context(class_name, file_name, THREAD);
 // Lookup stream for parsing .class file
 ClassFileStream* stream = NULL;
 int classpath_index = 0;
+ClassPathEntry* e = NULL;
+instanceKlassHandle h;
 {
 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
 PerfClassTraceTime::CLASS_LOAD);
-ClassPathEntry* e = _first_entry;
+e = _first_entry;
 while (e != NULL) {
-stream = e->open_stream(name, CHECK_NULL);
+stream = e->open_stream(file_name, CHECK_NULL);
+if (!context.check(stream, classpath_index)) {
+return h; // NULL
+}
 if (stream != NULL) {
 break;
 }
 e = e->next();
 ++classpath_index;
 }
 }
-instanceKlassHandle h;
 if (stream != NULL) {
 // class file found, parse it
 ClassFileParser parser(stream);
 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
 Handle protection_domain;
 TempNewSymbol parsed_name = NULL;
 instanceKlassHandle result = parser.parseClassFile(h_name,
 loader_data,
 protection_domain,
 parsed_name,
-false,
+context.should_verify(classpath_index),
-CHECK_(h));
+THREAD);
+if (HAS_PENDING_EXCEPTION) {
-// add to package table
+ResourceMark rm;
-if (add_package(name, classpath_index, THREAD)) {
+if (DumpSharedSpaces) {
-h = result;
+tty->print_cr("Preload Error: Failed to load %s", class_name);
+}
+return h;
+}
+h = context.record_result(classpath_index, e, result, THREAD);
+} else {
+if (DumpSharedSpaces) {
+tty->print_cr("Preload Error: Cannot find %s", class_name);
 }
 }
 return h;
 }
 }
 }
 // lookup zip library entry points
 load_zip_library();
+#if INCLUDE_CDS
 // initialize search path
+if (DumpSharedSpaces) {
+_shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
+}
+#endif
 setup_bootstrap_search_path();
 if (LazyBootClassLoader) {
 // set up meta index which makes boot classpath initialization lazier
-setup_meta_index();
+setup_bootstrap_meta_index();
 }
 }
+#if INCLUDE_CDS
+void ClassLoader::initialize_shared_path() {
+if (DumpSharedSpaces) {
+ClassLoaderExt::setup_search_paths();
+_shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
+}
+}
+#endif
 jlong ClassLoader::classloader_time_ms() {
 return UsePerfData ?
 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
 }

Mercurial > hg > truffle

comparison src/share/vm/classfile/classLoader.cpp @ 20375:6e0cb14ce59b