330 lines
12 KiB
C++
330 lines
12 KiB
C++
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/classFileParser.hpp"
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#include "classfile/classFileStream.hpp"
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#include "classfile/classListParser.hpp"
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#include "classfile/classLoader.inline.hpp"
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#include "classfile/classLoaderExt.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/klassFactory.hpp"
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#include "classfile/sharedClassUtil.hpp"
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#include "classfile/sharedPathsMiscInfo.hpp"
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#include "classfile/systemDictionaryShared.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/filemap.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/os.hpp"
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#include "services/threadService.hpp"
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#include "utilities/stringUtils.hpp"
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jshort ClassLoaderExt::_app_paths_start_index = ClassLoaderExt::max_classpath_index;
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bool ClassLoaderExt::_has_app_classes = false;
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bool ClassLoaderExt::_has_platform_classes = false;
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void ClassLoaderExt::setup_app_search_path() {
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assert(DumpSharedSpaces, "this function is only used with -Xshare:dump and -XX:+UseAppCDS");
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_app_paths_start_index = ClassLoader::num_boot_classpath_entries();
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char* app_class_path = os::strdup(Arguments::get_appclasspath());
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if (strcmp(app_class_path, ".") == 0) {
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// This doesn't make any sense, even for AppCDS, so let's skip it. We
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// don't want to throw an error here because -cp "." is usually assigned
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// by the launcher when classpath is not specified.
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trace_class_path("app loader class path (skipped)=", app_class_path);
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} else {
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trace_class_path("app loader class path=", app_class_path);
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shared_paths_misc_info()->add_app_classpath(app_class_path);
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ClassLoader::setup_app_search_path(app_class_path);
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}
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}
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char* ClassLoaderExt::read_manifest(ClassPathEntry* entry, jint *manifest_size, bool clean_text, TRAPS) {
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const char* name = "META-INF/MANIFEST.MF";
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char* manifest;
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jint size;
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assert(entry->is_jar_file(), "must be");
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manifest = (char*) ((ClassPathZipEntry*)entry )->open_entry(name, &size, true, CHECK_NULL);
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if (manifest == NULL) { // No Manifest
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*manifest_size = 0;
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return NULL;
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}
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if (clean_text) {
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// See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest
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// (1): replace all CR/LF and CR with LF
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StringUtils::replace_no_expand(manifest, "\r\n", "\n");
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// (2) remove all new-line continuation (remove all "\n " substrings)
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StringUtils::replace_no_expand(manifest, "\n ", "");
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}
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*manifest_size = (jint)strlen(manifest);
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return manifest;
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}
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char* ClassLoaderExt::get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size) {
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const char* tag = "Class-Path: ";
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const int tag_len = (int)strlen(tag);
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char* found = NULL;
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char* line_start = manifest;
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char* end = manifest + manifest_size;
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assert(*end == 0, "must be nul-terminated");
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while (line_start < end) {
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char* line_end = strchr(line_start, '\n');
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if (line_end == NULL) {
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// JAR spec require the manifest file to be terminated by a new line.
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break;
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}
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if (strncmp(tag, line_start, tag_len) == 0) {
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if (found != NULL) {
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// Same behavior as jdk/src/share/classes/java/util/jar/Attributes.java
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// If duplicated entries are found, the last one is used.
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tty->print_cr("Warning: Duplicate name in Manifest: %s.\n"
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"Ensure that the manifest does not have duplicate entries, and\n"
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"that blank lines separate individual sections in both your\n"
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"manifest and in the META-INF/MANIFEST.MF entry in the jar file:\n%s\n", tag, jar_path);
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}
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found = line_start + tag_len;
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assert(found <= line_end, "sanity");
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*line_end = '\0';
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}
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line_start = line_end + 1;
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}
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return found;
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}
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void ClassLoaderExt::process_jar_manifest(ClassPathEntry* entry,
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bool check_for_duplicates) {
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Thread* THREAD = Thread::current();
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ResourceMark rm(THREAD);
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jint manifest_size;
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char* manifest = read_manifest(entry, &manifest_size, CHECK);
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if (manifest == NULL) {
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return;
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}
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if (strstr(manifest, "Extension-List:") != NULL) {
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tty->print_cr("-Xshare:dump does not support Extension-List in JAR manifest: %s", entry->name());
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vm_exit(1);
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}
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char* cp_attr = get_class_path_attr(entry->name(), manifest, manifest_size);
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if (cp_attr != NULL && strlen(cp_attr) > 0) {
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trace_class_path("found Class-Path: ", cp_attr);
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char sep = os::file_separator()[0];
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const char* dir_name = entry->name();
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const char* dir_tail = strrchr(dir_name, sep);
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int dir_len;
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if (dir_tail == NULL) {
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dir_len = 0;
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} else {
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dir_len = dir_tail - dir_name + 1;
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}
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// Split the cp_attr by spaces, and add each file
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char* file_start = cp_attr;
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char* end = file_start + strlen(file_start);
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while (file_start < end) {
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char* file_end = strchr(file_start, ' ');
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if (file_end != NULL) {
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*file_end = 0;
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file_end += 1;
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} else {
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file_end = end;
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}
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int name_len = (int)strlen(file_start);
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if (name_len > 0) {
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ResourceMark rm(THREAD);
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char* libname = NEW_RESOURCE_ARRAY(char, dir_len + name_len + 1);
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*libname = 0;
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strncat(libname, dir_name, dir_len);
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strncat(libname, file_start, name_len);
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trace_class_path("library = ", libname);
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ClassLoader::update_class_path_entry_list(libname, true, false);
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}
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file_start = file_end;
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}
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}
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}
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void ClassLoaderExt::setup_search_paths() {
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if (UseAppCDS) {
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shared_paths_misc_info()->record_app_offset();
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ClassLoaderExt::setup_app_search_path();
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}
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}
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Thread* ClassLoaderExt::Context::_dump_thread = NULL;
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void ClassLoaderExt::record_result(ClassLoaderExt::Context *context,
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Symbol* class_name,
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const s2 classpath_index,
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InstanceKlass* result,
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TRAPS) {
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assert(DumpSharedSpaces, "Sanity");
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// We need to remember where the class comes from during dumping.
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oop loader = result->class_loader();
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s2 classloader_type = ClassLoader::BOOT_LOADER;
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if (SystemDictionary::is_system_class_loader(loader)) {
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classloader_type = ClassLoader::APP_LOADER;
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ClassLoaderExt::set_has_app_classes();
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} else if (SystemDictionary::is_platform_class_loader(loader)) {
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classloader_type = ClassLoader::PLATFORM_LOADER;
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ClassLoaderExt::set_has_platform_classes();
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}
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result->set_shared_classpath_index(classpath_index);
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result->set_class_loader_type(classloader_type);
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}
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void ClassLoaderExt::finalize_shared_paths_misc_info() {
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if (UseAppCDS) {
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if (!_has_app_classes) {
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shared_paths_misc_info()->pop_app();
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}
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}
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}
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// Load the class of the given name from the location given by path. The path is specified by
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// the "source:" in the class list file (see classListParser.cpp), and can be a directory or
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// a JAR file.
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InstanceKlass* ClassLoaderExt::load_class(Symbol* name, const char* path, TRAPS) {
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assert(name != NULL, "invariant");
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assert(DumpSharedSpaces && UseAppCDS, "this function is only used with -Xshare:dump and -XX:+UseAppCDS");
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ResourceMark rm(THREAD);
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const char* class_name = name->as_C_string();
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const char* file_name = file_name_for_class_name(class_name,
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name->utf8_length());
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assert(file_name != NULL, "invariant");
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// Lookup stream for parsing .class file
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ClassFileStream* stream = NULL;
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ClassPathEntry* e = find_classpath_entry_from_cache(path, CHECK_NULL);
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if (e == NULL) {
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return NULL;
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}
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{
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PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
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((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
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PerfClassTraceTime::CLASS_LOAD);
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stream = e->open_stream(file_name, CHECK_NULL);
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}
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if (NULL == stream) {
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tty->print_cr("Preload Warning: Cannot find %s", class_name);
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return NULL;
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}
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assert(stream != NULL, "invariant");
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stream->set_verify(true);
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ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
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Handle protection_domain;
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InstanceKlass* result = KlassFactory::create_from_stream(stream,
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name,
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loader_data,
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protection_domain,
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NULL, // host_klass
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NULL, // cp_patches
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THREAD);
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if (HAS_PENDING_EXCEPTION) {
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tty->print_cr("Preload Error: Failed to load %s", class_name);
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return NULL;
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}
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result->set_shared_classpath_index(UNREGISTERED_INDEX);
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SystemDictionaryShared::set_shared_class_misc_info(result, stream);
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return result;
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}
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struct CachedClassPathEntry {
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const char* _path;
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ClassPathEntry* _entry;
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};
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static GrowableArray<CachedClassPathEntry>* cached_path_entries = NULL;
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ClassPathEntry* ClassLoaderExt::find_classpath_entry_from_cache(const char* path, TRAPS) {
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// This is called from dump time so it's single threaded and there's no need for a lock.
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assert(DumpSharedSpaces && UseAppCDS, "this function is only used with -Xshare:dump and -XX:+UseAppCDS");
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if (cached_path_entries == NULL) {
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cached_path_entries = new (ResourceObj::C_HEAP, mtClass) GrowableArray<CachedClassPathEntry>(20, /*c heap*/ true);
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}
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CachedClassPathEntry ccpe;
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for (int i=0; i<cached_path_entries->length(); i++) {
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ccpe = cached_path_entries->at(i);
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if (strcmp(ccpe._path, path) == 0) {
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if (i != 0) {
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// Put recent entries at the beginning to speed up searches.
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cached_path_entries->remove_at(i);
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cached_path_entries->insert_before(0, ccpe);
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}
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return ccpe._entry;
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}
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}
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struct stat st;
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if (os::stat(path, &st) != 0) {
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// File or directory not found
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return NULL;
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}
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ClassPathEntry* new_entry = NULL;
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new_entry = create_class_path_entry(path, &st, false, false, CHECK_NULL);
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if (new_entry == NULL) {
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return NULL;
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}
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ccpe._path = strdup(path);
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ccpe._entry = new_entry;
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cached_path_entries->insert_before(0, ccpe);
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return new_entry;
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}
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Klass* ClassLoaderExt::load_one_class(ClassListParser* parser, TRAPS) {
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return parser->load_current_class(THREAD);
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}
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