1715 lines
64 KiB
C++
1715 lines
64 KiB
C++
/*
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* Copyright (c) 1997, 2020, 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 "jvm.h"
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#include "jimage.hpp"
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#include "classfile/classFileStream.hpp"
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#include "classfile/classLoader.inline.hpp"
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#include "classfile/classLoaderData.inline.hpp"
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#include "classfile/classLoaderExt.hpp"
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#include "classfile/classLoadInfo.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/modules.hpp"
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#include "classfile/packageEntry.hpp"
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#include "classfile/klassFactory.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/systemDictionaryShared.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "compiler/compileBroker.hpp"
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#include "interpreter/bytecodeStream.hpp"
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#include "interpreter/oopMapCache.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "logging/logTag.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/filemap.hpp"
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#include "memory/oopFactory.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/instanceRefKlass.hpp"
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#include "oops/method.inline.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "prims/jvm_misc.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/init.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/threadCritical.hpp"
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#include "runtime/timer.hpp"
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#include "runtime/vm_version.hpp"
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#include "services/management.hpp"
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#include "services/threadService.hpp"
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#include "utilities/classpathStream.hpp"
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#include "utilities/events.hpp"
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#include "utilities/hashtable.inline.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/utf8.hpp"
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// Entry point in java.dll for path canonicalization
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typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
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static canonicalize_fn_t CanonicalizeEntry = NULL;
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// Entry points in zip.dll for loading zip/jar file entries
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typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
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typedef void (*ZipClose_t)(jzfile *zip);
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typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
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typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
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typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
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typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
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static ZipOpen_t ZipOpen = NULL;
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static ZipClose_t ZipClose = NULL;
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static FindEntry_t FindEntry = NULL;
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static ReadEntry_t ReadEntry = NULL;
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static GetNextEntry_t GetNextEntry = NULL;
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static Crc32_t Crc32 = NULL;
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int ClassLoader::_libzip_loaded = 0;
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// Entry points for jimage.dll for loading jimage file entries
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static JImageOpen_t JImageOpen = NULL;
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static JImageClose_t JImageClose = NULL;
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static JImagePackageToModule_t JImagePackageToModule = NULL;
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static JImageFindResource_t JImageFindResource = NULL;
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static JImageGetResource_t JImageGetResource = NULL;
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static JImageResourceIterator_t JImageResourceIterator = NULL;
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// Globals
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PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
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PerfCounter* ClassLoader::_perf_classes_inited = NULL;
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PerfCounter* ClassLoader::_perf_class_init_time = NULL;
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PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
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PerfCounter* ClassLoader::_perf_classes_verified = NULL;
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PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
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PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
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PerfCounter* ClassLoader::_perf_classes_linked = NULL;
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PerfCounter* ClassLoader::_perf_class_link_time = NULL;
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PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
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PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
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PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
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PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
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PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
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PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
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PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
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PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
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PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
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PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
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PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
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PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
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PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
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PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
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PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
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PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
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PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
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PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
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GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
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GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
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ClassPathEntry* ClassLoader::_jrt_entry = NULL;
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ClassPathEntry* ClassLoader::_first_append_entry = NULL;
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ClassPathEntry* ClassLoader::_last_append_entry = NULL;
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#if INCLUDE_CDS
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ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
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ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
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ClassPathEntry* ClassLoader::_module_path_entries = NULL;
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ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
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#endif
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// helper routines
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bool string_starts_with(const char* str, const char* str_to_find) {
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size_t str_len = strlen(str);
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size_t str_to_find_len = strlen(str_to_find);
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if (str_to_find_len > str_len) {
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return false;
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}
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return (strncmp(str, str_to_find, str_to_find_len) == 0);
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}
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static const char* get_jimage_version_string() {
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static char version_string[10] = "";
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if (version_string[0] == '\0') {
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jio_snprintf(version_string, sizeof(version_string), "%d.%d",
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VM_Version::vm_major_version(), VM_Version::vm_minor_version());
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}
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return (const char*)version_string;
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}
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bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
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size_t str_len = strlen(str);
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size_t str_to_find_len = strlen(str_to_find);
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if (str_to_find_len > str_len) {
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return false;
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}
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return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
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}
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// Used to obtain the package name from a fully qualified class name.
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Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
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if (name == NULL) {
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if (bad_class_name != NULL) {
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*bad_class_name = true;
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}
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return NULL;
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}
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int utf_len = name->utf8_length();
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const jbyte* base = (const jbyte*)name->base();
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const jbyte* start = base;
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const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH);
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if (end == NULL) {
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return NULL;
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}
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// Skip over '['s
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if (*start == JVM_SIGNATURE_ARRAY) {
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do {
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start++;
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} while (start < end && *start == JVM_SIGNATURE_ARRAY);
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// Fully qualified class names should not contain a 'L'.
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// Set bad_class_name to true to indicate that the package name
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// could not be obtained due to an error condition.
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// In this situation, is_same_class_package returns false.
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if (*start == JVM_SIGNATURE_CLASS) {
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if (bad_class_name != NULL) {
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*bad_class_name = true;
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}
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return NULL;
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}
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}
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// A class name could have just the slash character in the name,
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// in which case start > end
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if (start >= end) {
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// No package name
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if (bad_class_name != NULL) {
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*bad_class_name = true;
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}
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return NULL;
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}
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return SymbolTable::new_symbol(name, start - base, end - base);
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}
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// Given a fully qualified package name, find its defining package in the class loader's
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// package entry table.
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PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
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if (pkg_name == NULL) {
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return NULL;
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}
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PackageEntryTable* pkgEntryTable = loader_data->packages();
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return pkgEntryTable->lookup_only(pkg_name);
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}
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const char* ClassPathEntry::copy_path(const char* path) {
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char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
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strcpy(copy, path);
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return copy;
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}
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ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
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// construct full path name
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assert((_dir != NULL) && (name != NULL), "sanity");
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size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
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char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
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int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
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assert(len == (int)(path_len - 1), "sanity");
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// check if file exists
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struct stat st;
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if (os::stat(path, &st) == 0) {
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// found file, open it
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int file_handle = os::open(path, 0, 0);
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if (file_handle != -1) {
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// read contents into resource array
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u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
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size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
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// close file
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os::close(file_handle);
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// construct ClassFileStream
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if (num_read == (size_t)st.st_size) {
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if (UsePerfData) {
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ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
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}
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FREE_RESOURCE_ARRAY(char, path, path_len);
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// Resource allocated
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return new ClassFileStream(buffer,
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st.st_size,
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_dir,
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ClassFileStream::verify);
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}
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}
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}
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FREE_RESOURCE_ARRAY(char, path, path_len);
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return NULL;
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}
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ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
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bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
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_zip = zip;
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_zip_name = copy_path(zip_name);
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_from_class_path_attr = from_class_path_attr;
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}
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ClassPathZipEntry::~ClassPathZipEntry() {
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(*ZipClose)(_zip);
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FREE_C_HEAP_ARRAY(char, _zip_name);
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}
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u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
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// enable call to C land
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JavaThread* thread = JavaThread::current();
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ThreadToNativeFromVM ttn(thread);
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// check whether zip archive contains name
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jint name_len;
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jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
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if (entry == NULL) return NULL;
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u1* buffer;
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char name_buf[128];
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char* filename;
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if (name_len < 128) {
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filename = name_buf;
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} else {
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filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
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}
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// read contents into resource array
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int size = (*filesize) + ((nul_terminate) ? 1 : 0);
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buffer = NEW_RESOURCE_ARRAY(u1, size);
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if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
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// return result
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if (nul_terminate) {
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buffer[*filesize] = 0;
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}
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return buffer;
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}
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ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
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jint filesize;
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u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
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if (buffer == NULL) {
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return NULL;
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}
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if (UsePerfData) {
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ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
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}
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// Resource allocated
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return new ClassFileStream(buffer,
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filesize,
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_zip_name,
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ClassFileStream::verify);
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}
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// invoke function for each entry in the zip file
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void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
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JavaThread* thread = JavaThread::current();
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HandleMark handle_mark(thread);
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ThreadToNativeFromVM ttn(thread);
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for (int n = 0; ; n++) {
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jzentry * ze = ((*GetNextEntry)(_zip, n));
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if (ze == NULL) break;
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(*f)(ze->name, context);
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}
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}
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DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
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void ClassPathImageEntry::close_jimage() {
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if (_jimage != NULL) {
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(*JImageClose)(_jimage);
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_jimage = NULL;
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}
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}
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ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
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ClassPathEntry(),
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_jimage(jimage) {
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guarantee(jimage != NULL, "jimage file is null");
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guarantee(name != NULL, "jimage file name is null");
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assert(_singleton == NULL, "VM supports only one jimage");
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DEBUG_ONLY(_singleton = this);
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size_t len = strlen(name) + 1;
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_name = copy_path(name);
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}
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ClassPathImageEntry::~ClassPathImageEntry() {
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assert(_singleton == this, "must be");
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DEBUG_ONLY(_singleton = NULL);
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FREE_C_HEAP_ARRAY(const char, _name);
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if (_jimage != NULL) {
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(*JImageClose)(_jimage);
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_jimage = NULL;
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}
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}
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ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
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return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
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}
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// For a class in a named module, look it up in the jimage file using this syntax:
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// /<module-name>/<package-name>/<base-class>
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//
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// Assumptions:
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// 1. There are no unnamed modules in the jimage file.
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// 2. A package is in at most one module in the jimage file.
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//
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ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
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jlong size;
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JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
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if (location == 0) {
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TempNewSymbol class_name = SymbolTable::new_symbol(name);
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TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
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if (pkg_name != NULL) {
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if (!Universe::is_module_initialized()) {
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location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
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} else {
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PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
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if (package_entry != NULL) {
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ResourceMark rm(THREAD);
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// Get the module name
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ModuleEntry* module = package_entry->module();
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assert(module != NULL, "Boot classLoader package missing module");
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assert(module->is_named(), "Boot classLoader package is in unnamed module");
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const char* module_name = module->name()->as_C_string();
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if (module_name != NULL) {
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location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
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}
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}
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}
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}
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}
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if (location != 0) {
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if (UsePerfData) {
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ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
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}
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char* data = NEW_RESOURCE_ARRAY(char, size);
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(*JImageGetResource)(_jimage, location, data, size);
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// Resource allocated
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assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
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return new ClassFileStream((u1*)data,
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(int)size,
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_name,
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ClassFileStream::verify,
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true); // from_boot_loader_modules_image
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}
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return NULL;
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}
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|
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JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
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const char* module_name,
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const char* file_name,
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jlong &size) {
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return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
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}
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bool ClassPathImageEntry::is_modules_image() const {
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assert(this == _singleton, "VM supports a single jimage");
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assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
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return true;
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}
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|
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#if INCLUDE_CDS
|
|
void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
|
|
Arguments::assert_is_dumping_archive();
|
|
tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
|
|
vm_exit_during_initialization(error, message);
|
|
}
|
|
#endif
|
|
|
|
ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
|
|
_module_name = module_name;
|
|
_module_first_entry = NULL;
|
|
_module_last_entry = NULL;
|
|
}
|
|
|
|
ModuleClassPathList::~ModuleClassPathList() {
|
|
// Clean out each ClassPathEntry on list
|
|
ClassPathEntry* e = _module_first_entry;
|
|
while (e != NULL) {
|
|
ClassPathEntry* next_entry = e->next();
|
|
delete e;
|
|
e = next_entry;
|
|
}
|
|
}
|
|
|
|
void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
|
|
if (new_entry != NULL) {
|
|
if (_module_last_entry == NULL) {
|
|
_module_first_entry = _module_last_entry = new_entry;
|
|
} else {
|
|
_module_last_entry->set_next(new_entry);
|
|
_module_last_entry = new_entry;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClassLoader::trace_class_path(const char* msg, const char* name) {
|
|
LogTarget(Info, class, path) lt;
|
|
if (lt.is_enabled()) {
|
|
LogStream ls(lt);
|
|
if (msg) {
|
|
ls.print("%s", msg);
|
|
}
|
|
if (name) {
|
|
if (strlen(name) < 256) {
|
|
ls.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') {
|
|
ls.print("%c", name[0]);
|
|
name++;
|
|
}
|
|
}
|
|
}
|
|
ls.cr();
|
|
}
|
|
}
|
|
|
|
void ClassLoader::setup_bootstrap_search_path() {
|
|
const char* sys_class_path = Arguments::get_sysclasspath();
|
|
assert(sys_class_path != NULL, "System boot class path must not be NULL");
|
|
if (PrintSharedArchiveAndExit) {
|
|
// Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
|
|
// the same as the bootcp of the shared archive.
|
|
} else {
|
|
trace_class_path("bootstrap loader class path=", sys_class_path);
|
|
}
|
|
setup_boot_search_path(sys_class_path);
|
|
}
|
|
|
|
#if INCLUDE_CDS
|
|
void ClassLoader::setup_app_search_path(const char *class_path) {
|
|
Arguments::assert_is_dumping_archive();
|
|
|
|
ResourceMark rm;
|
|
ClasspathStream cp_stream(class_path);
|
|
|
|
while (cp_stream.has_next()) {
|
|
const char* path = cp_stream.get_next();
|
|
update_class_path_entry_list(path, false, false, false);
|
|
}
|
|
}
|
|
|
|
void ClassLoader::add_to_module_path_entries(const char* path,
|
|
ClassPathEntry* entry) {
|
|
assert(entry != NULL, "ClassPathEntry should not be NULL");
|
|
Arguments::assert_is_dumping_archive();
|
|
|
|
// The entry does not exist, add to the list
|
|
if (_module_path_entries == NULL) {
|
|
assert(_last_module_path_entry == NULL, "Sanity");
|
|
_module_path_entries = _last_module_path_entry = entry;
|
|
} else {
|
|
_last_module_path_entry->set_next(entry);
|
|
_last_module_path_entry = entry;
|
|
}
|
|
}
|
|
|
|
// Add a module path to the _module_path_entries list.
|
|
void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
|
|
Arguments::assert_is_dumping_archive();
|
|
struct stat st;
|
|
if (os::stat(path, &st) != 0) {
|
|
tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
|
|
errno, os::errno_name(errno), path);
|
|
vm_exit_during_initialization();
|
|
}
|
|
// File or directory found
|
|
ClassPathEntry* new_entry = NULL;
|
|
new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
|
|
false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
|
|
if (new_entry == NULL) {
|
|
return;
|
|
}
|
|
|
|
add_to_module_path_entries(path, new_entry);
|
|
return;
|
|
}
|
|
|
|
void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
|
|
update_module_path_entry_list(path, THREAD);
|
|
}
|
|
|
|
#endif // INCLUDE_CDS
|
|
|
|
void ClassLoader::close_jrt_image() {
|
|
// Not applicable for exploded builds
|
|
if (!ClassLoader::has_jrt_entry()) return;
|
|
_jrt_entry->close_jimage();
|
|
}
|
|
|
|
// Construct the array of module/path pairs as specified to --patch-module
|
|
// for the boot loader to search ahead of the jimage, if the class being
|
|
// loaded is defined to a module that has been specified to --patch-module.
|
|
void ClassLoader::setup_patch_mod_entries() {
|
|
Thread* THREAD = Thread::current();
|
|
GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
|
|
int num_of_entries = patch_mod_args->length();
|
|
|
|
// Set up the boot loader's _patch_mod_entries list
|
|
_patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
|
|
|
|
for (int i = 0; i < num_of_entries; i++) {
|
|
const char* module_name = (patch_mod_args->at(i))->module_name();
|
|
Symbol* const module_sym = SymbolTable::new_symbol(module_name);
|
|
assert(module_sym != NULL, "Failed to obtain Symbol for module name");
|
|
ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
|
|
|
|
char* class_path = (patch_mod_args->at(i))->path_string();
|
|
ResourceMark rm(THREAD);
|
|
ClasspathStream cp_stream(class_path);
|
|
|
|
while (cp_stream.has_next()) {
|
|
const char* path = cp_stream.get_next();
|
|
struct stat st;
|
|
if (os::stat(path, &st) == 0) {
|
|
// File or directory found
|
|
ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
|
|
// If the path specification is valid, enter it into this module's list
|
|
if (new_entry != NULL) {
|
|
module_cpl->add_to_list(new_entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Record the module into the list of --patch-module entries only if
|
|
// valid ClassPathEntrys have been created
|
|
if (module_cpl->module_first_entry() != NULL) {
|
|
_patch_mod_entries->push(module_cpl);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Determine whether the module has been patched via the command-line
|
|
// option --patch-module
|
|
bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
|
|
if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
|
|
int table_len = _patch_mod_entries->length();
|
|
for (int i = 0; i < table_len; i++) {
|
|
ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
|
|
if (module_name->fast_compare(patch_mod->module_name()) == 0) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Set up the _jrt_entry if present and boot append path
|
|
void ClassLoader::setup_boot_search_path(const char *class_path) {
|
|
EXCEPTION_MARK;
|
|
ResourceMark rm(THREAD);
|
|
ClasspathStream cp_stream(class_path);
|
|
bool set_base_piece = true;
|
|
|
|
#if INCLUDE_CDS
|
|
if (Arguments::is_dumping_archive()) {
|
|
if (!Arguments::has_jimage()) {
|
|
vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
while (cp_stream.has_next()) {
|
|
const char* path = cp_stream.get_next();
|
|
|
|
if (set_base_piece) {
|
|
// The first time through the bootstrap_search setup, it must be determined
|
|
// what the base or core piece of the boot loader search is. Either a java runtime
|
|
// image is present or this is an exploded module build situation.
|
|
assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
|
|
"Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
|
|
struct stat st;
|
|
if (os::stat(path, &st) == 0) {
|
|
// Directory found
|
|
ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
|
|
|
|
// Check for a jimage
|
|
if (Arguments::has_jimage()) {
|
|
assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
|
|
_jrt_entry = new_entry;
|
|
assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
|
|
assert(_jrt_entry->jimage() != NULL, "No java runtime image");
|
|
}
|
|
} else {
|
|
// If path does not exist, exit
|
|
vm_exit_during_initialization("Unable to establish the boot loader search path", path);
|
|
}
|
|
set_base_piece = false;
|
|
} else {
|
|
// Every entry on the system boot class path after the initial base piece,
|
|
// which is set by os::set_boot_path(), is considered an appended entry.
|
|
update_class_path_entry_list(path, false, true, false);
|
|
}
|
|
}
|
|
}
|
|
|
|
// During an exploded modules build, each module defined to the boot loader
|
|
// will be added to the ClassLoader::_exploded_entries array.
|
|
void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
|
|
assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
|
|
assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
|
|
|
|
// Find the module's symbol
|
|
ResourceMark rm(THREAD);
|
|
const char *module_name = module_sym->as_C_string();
|
|
const char *home = Arguments::get_java_home();
|
|
const char file_sep = os::file_separator()[0];
|
|
// 10 represents the length of "modules" + 2 file separators + \0
|
|
size_t len = strlen(home) + strlen(module_name) + 10;
|
|
char *path = NEW_RESOURCE_ARRAY(char, len);
|
|
jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
|
|
|
|
struct stat st;
|
|
if (os::stat(path, &st) == 0) {
|
|
// Directory found
|
|
ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
|
|
|
|
// If the path specification is valid, enter it into this module's list.
|
|
// There is no need to check for duplicate modules in the exploded entry list,
|
|
// since no two modules with the same name can be defined to the boot loader.
|
|
// This is checked at module definition time in Modules::define_module.
|
|
if (new_entry != NULL) {
|
|
ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
|
|
module_cpl->add_to_list(new_entry);
|
|
{
|
|
MutexLocker ml(THREAD, Module_lock);
|
|
_exploded_entries->push(module_cpl);
|
|
}
|
|
log_info(class, load)("path: %s", path);
|
|
}
|
|
}
|
|
}
|
|
|
|
ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
|
|
bool throw_exception,
|
|
bool is_boot_append,
|
|
bool from_class_path_attr,
|
|
TRAPS) {
|
|
JavaThread* thread = JavaThread::current();
|
|
ClassPathEntry* new_entry = NULL;
|
|
if ((st->st_mode & S_IFMT) == S_IFREG) {
|
|
ResourceMark rm(thread);
|
|
// Regular file, should be a zip or jimage file
|
|
// Canonicalized filename
|
|
char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
|
|
if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
|
|
// This matches the classic VM
|
|
if (throw_exception) {
|
|
THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
jint error;
|
|
JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
|
|
if (jimage != NULL) {
|
|
new_entry = new ClassPathImageEntry(jimage, canonical_path);
|
|
} else {
|
|
char* error_msg = NULL;
|
|
jzfile* zip;
|
|
{
|
|
// enable call to C land
|
|
ThreadToNativeFromVM ttn(thread);
|
|
HandleMark hm(thread);
|
|
load_zip_library_if_needed();
|
|
zip = (*ZipOpen)(canonical_path, &error_msg);
|
|
}
|
|
if (zip != NULL && error_msg == NULL) {
|
|
new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
|
|
} else {
|
|
char *msg;
|
|
if (error_msg == NULL) {
|
|
msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
|
|
jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
|
|
} else {
|
|
int len = (int)(strlen(path) + strlen(error_msg) + 128);
|
|
msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
|
|
jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
|
|
}
|
|
// Don't complain about bad jar files added via -Xbootclasspath/a:.
|
|
if (throw_exception && is_init_completed()) {
|
|
THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
log_info(class, path)("opened: %s", path);
|
|
log_info(class, load)("opened: %s", path);
|
|
} else {
|
|
// Directory
|
|
new_entry = new ClassPathDirEntry(path);
|
|
log_info(class, load)("path: %s", path);
|
|
}
|
|
return new_entry;
|
|
}
|
|
|
|
|
|
// Create a class path zip entry for a given path (return NULL if not found
|
|
// or zip/JAR file cannot be opened)
|
|
ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
|
|
// check for a regular file
|
|
struct stat st;
|
|
if (os::stat(path, &st) == 0) {
|
|
if ((st.st_mode & S_IFMT) == S_IFREG) {
|
|
char canonical_path[JVM_MAXPATHLEN];
|
|
if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
|
|
char* error_msg = NULL;
|
|
jzfile* zip;
|
|
{
|
|
// enable call to C land
|
|
JavaThread* thread = JavaThread::current();
|
|
ThreadToNativeFromVM ttn(thread);
|
|
HandleMark hm(thread);
|
|
load_zip_library_if_needed();
|
|
zip = (*ZipOpen)(canonical_path, &error_msg);
|
|
}
|
|
if (zip != NULL && error_msg == NULL) {
|
|
// create using canonical path
|
|
return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
// returns true if entry already on class path
|
|
bool ClassLoader::contains_append_entry(const char* name) {
|
|
ClassPathEntry* e = _first_append_entry;
|
|
while (e != NULL) {
|
|
// assume zip entries have been canonicalized
|
|
if (strcmp(name, e->name()) == 0) {
|
|
return true;
|
|
}
|
|
e = e->next();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
|
|
if (new_entry != NULL) {
|
|
if (_last_append_entry == NULL) {
|
|
assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
|
|
_first_append_entry = _last_append_entry = new_entry;
|
|
} else {
|
|
_last_append_entry->set_next(new_entry);
|
|
_last_append_entry = new_entry;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Record the path entries specified in -cp during dump time. The recorded
|
|
// information will be used at runtime for loading the archived app classes.
|
|
//
|
|
// Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
|
|
// loading app classes. Instead, the app class are loaded by the
|
|
// jdk/internal/loader/ClassLoaders$AppClassLoader instance.
|
|
void ClassLoader::add_to_app_classpath_entries(const char* path,
|
|
ClassPathEntry* entry,
|
|
bool check_for_duplicates) {
|
|
#if INCLUDE_CDS
|
|
assert(entry != NULL, "ClassPathEntry should not be NULL");
|
|
ClassPathEntry* e = _app_classpath_entries;
|
|
if (check_for_duplicates) {
|
|
while (e != NULL) {
|
|
if (strcmp(e->name(), entry->name()) == 0) {
|
|
// entry already exists
|
|
return;
|
|
}
|
|
e = e->next();
|
|
}
|
|
}
|
|
|
|
// The entry does not exist, add to the list
|
|
if (_app_classpath_entries == NULL) {
|
|
assert(_last_app_classpath_entry == NULL, "Sanity");
|
|
_app_classpath_entries = _last_app_classpath_entry = entry;
|
|
} else {
|
|
_last_app_classpath_entry->set_next(entry);
|
|
_last_app_classpath_entry = entry;
|
|
}
|
|
|
|
if (entry->is_jar_file()) {
|
|
ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// Returns true IFF the file/dir exists and the entry was successfully created.
|
|
bool ClassLoader::update_class_path_entry_list(const char *path,
|
|
bool check_for_duplicates,
|
|
bool is_boot_append,
|
|
bool from_class_path_attr,
|
|
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, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
|
|
if (new_entry == NULL) {
|
|
return false;
|
|
}
|
|
|
|
// Do not reorder the bootclasspath which would break get_system_package().
|
|
// Add new entry to linked list
|
|
if (is_boot_append) {
|
|
add_to_boot_append_entries(new_entry);
|
|
} else {
|
|
add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
|
|
}
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
|
|
ResourceMark rm;
|
|
int num_of_entries = module_list->length();
|
|
for (int i = 0; i < num_of_entries; i++) {
|
|
ClassPathEntry* e;
|
|
ModuleClassPathList* mpl = module_list->at(i);
|
|
tty->print("%s=", mpl->module_name()->as_C_string());
|
|
e = mpl->module_first_entry();
|
|
while (e != NULL) {
|
|
tty->print("%s", e->name());
|
|
e = e->next();
|
|
if (e != NULL) {
|
|
tty->print("%s", os::path_separator());
|
|
}
|
|
}
|
|
tty->print(" ;");
|
|
}
|
|
}
|
|
|
|
void ClassLoader::print_bootclasspath() {
|
|
ClassPathEntry* e;
|
|
tty->print("[bootclasspath= ");
|
|
|
|
// Print --patch-module module/path specifications first
|
|
if (_patch_mod_entries != NULL) {
|
|
print_module_entry_table(_patch_mod_entries);
|
|
}
|
|
|
|
// [jimage | exploded modules build]
|
|
if (has_jrt_entry()) {
|
|
// Print the location of the java runtime image
|
|
tty->print("%s ;", _jrt_entry->name());
|
|
} else {
|
|
// Print exploded module build path specifications
|
|
if (_exploded_entries != NULL) {
|
|
print_module_entry_table(_exploded_entries);
|
|
}
|
|
}
|
|
|
|
// appended entries
|
|
e = _first_append_entry;
|
|
while (e != NULL) {
|
|
tty->print("%s ;", e->name());
|
|
e = e->next();
|
|
}
|
|
tty->print_cr("]");
|
|
}
|
|
|
|
void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
|
|
void* func = os::dll_lookup(lib, name);
|
|
if (func == NULL) {
|
|
char msg[256] = "";
|
|
jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
|
|
vm_exit_during_initialization(msg, path);
|
|
}
|
|
return func;
|
|
}
|
|
|
|
void ClassLoader::load_java_library() {
|
|
assert(CanonicalizeEntry == NULL, "should not load java library twice");
|
|
void *javalib_handle = os::native_java_library();
|
|
if (javalib_handle == NULL) {
|
|
vm_exit_during_initialization("Unable to load java library", NULL);
|
|
}
|
|
|
|
CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", NULL));
|
|
}
|
|
|
|
void ClassLoader::release_load_zip_library() {
|
|
MutexLocker locker(Zip_lock, Monitor::_no_safepoint_check_flag);
|
|
if (_libzip_loaded == 0) {
|
|
load_zip_library();
|
|
Atomic::release_store(&_libzip_loaded, 1);
|
|
}
|
|
}
|
|
|
|
void ClassLoader::load_zip_library() {
|
|
assert(ZipOpen == NULL, "should not load zip library twice");
|
|
char path[JVM_MAXPATHLEN];
|
|
char ebuf[1024];
|
|
void* handle = NULL;
|
|
if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
|
|
handle = os::dll_load(path, ebuf, sizeof ebuf);
|
|
}
|
|
if (handle == NULL) {
|
|
vm_exit_during_initialization("Unable to load zip library", path);
|
|
}
|
|
|
|
ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, dll_lookup(handle, "ZIP_Open", path));
|
|
ZipClose = CAST_TO_FN_PTR(ZipClose_t, dll_lookup(handle, "ZIP_Close", path));
|
|
FindEntry = CAST_TO_FN_PTR(FindEntry_t, dll_lookup(handle, "ZIP_FindEntry", path));
|
|
ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, dll_lookup(handle, "ZIP_ReadEntry", path));
|
|
GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, dll_lookup(handle, "ZIP_GetNextEntry", path));
|
|
Crc32 = CAST_TO_FN_PTR(Crc32_t, dll_lookup(handle, "ZIP_CRC32", path));
|
|
}
|
|
|
|
void ClassLoader::load_jimage_library() {
|
|
assert(JImageOpen == NULL, "should not load jimage library twice");
|
|
char path[JVM_MAXPATHLEN];
|
|
char ebuf[1024];
|
|
void* handle = NULL;
|
|
if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
|
|
handle = os::dll_load(path, ebuf, sizeof ebuf);
|
|
}
|
|
if (handle == NULL) {
|
|
vm_exit_during_initialization("Unable to load jimage library", path);
|
|
}
|
|
|
|
JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
|
|
JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
|
|
JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, dll_lookup(handle, "JIMAGE_PackageToModule", path));
|
|
JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
|
|
JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
|
|
JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, dll_lookup(handle, "JIMAGE_ResourceIterator", path));
|
|
}
|
|
|
|
int ClassLoader::crc32(int crc, const char* buf, int len) {
|
|
load_zip_library_if_needed();
|
|
return (*Crc32)(crc, (const jbyte*)buf, len);
|
|
}
|
|
|
|
oop ClassLoader::get_system_package(const char* name, TRAPS) {
|
|
// Look up the name in the boot loader's package entry table.
|
|
if (name != NULL) {
|
|
TempNewSymbol package_sym = SymbolTable::new_symbol(name);
|
|
// Look for the package entry in the boot loader's package entry table.
|
|
PackageEntry* package =
|
|
ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
|
|
|
|
// Return NULL if package does not exist or if no classes in that package
|
|
// have been loaded.
|
|
if (package != NULL && package->has_loaded_class()) {
|
|
ModuleEntry* module = package->module();
|
|
if (module->location() != NULL) {
|
|
ResourceMark rm(THREAD);
|
|
Handle ml = java_lang_String::create_from_str(
|
|
module->location()->as_C_string(), THREAD);
|
|
return ml();
|
|
}
|
|
// Return entry on boot loader class path.
|
|
Handle cph = java_lang_String::create_from_str(
|
|
ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
|
|
return cph();
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
objArrayOop ClassLoader::get_system_packages(TRAPS) {
|
|
ResourceMark rm(THREAD);
|
|
// List of pointers to PackageEntrys that have loaded classes.
|
|
GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
|
|
{
|
|
MutexLocker ml(THREAD, Module_lock);
|
|
|
|
PackageEntryTable* pe_table =
|
|
ClassLoaderData::the_null_class_loader_data()->packages();
|
|
|
|
// Collect the packages that have at least one loaded class.
|
|
for (int x = 0; x < pe_table->table_size(); x++) {
|
|
for (PackageEntry* package_entry = pe_table->bucket(x);
|
|
package_entry != NULL;
|
|
package_entry = package_entry->next()) {
|
|
if (package_entry->has_loaded_class()) {
|
|
loaded_class_pkgs->append(package_entry);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Allocate objArray and fill with java.lang.String
|
|
objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
|
|
loaded_class_pkgs->length(), CHECK_NULL);
|
|
objArrayHandle result(THREAD, r);
|
|
for (int x = 0; x < loaded_class_pkgs->length(); x++) {
|
|
PackageEntry* package_entry = loaded_class_pkgs->at(x);
|
|
Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
|
|
result->obj_at_put(x, str());
|
|
}
|
|
return result();
|
|
}
|
|
|
|
// caller needs ResourceMark
|
|
const char* ClassLoader::file_name_for_class_name(const char* class_name,
|
|
int class_name_len) {
|
|
assert(class_name != NULL, "invariant");
|
|
assert((int)strlen(class_name) == class_name_len, "invariant");
|
|
|
|
static const char class_suffix[] = ".class";
|
|
size_t class_suffix_len = sizeof(class_suffix);
|
|
|
|
char* const file_name = NEW_RESOURCE_ARRAY(char,
|
|
class_name_len +
|
|
class_suffix_len); // includes term NULL
|
|
|
|
strncpy(file_name, class_name, class_name_len);
|
|
strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
|
|
|
|
return file_name;
|
|
}
|
|
|
|
ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
|
|
const GrowableArray<ModuleClassPathList*>* const module_list) {
|
|
int num_of_entries = module_list->length();
|
|
const Symbol* class_module_name = mod_entry->name();
|
|
|
|
// Loop through all the modules in either the patch-module or exploded entries looking for module
|
|
for (int i = 0; i < num_of_entries; i++) {
|
|
ModuleClassPathList* module_cpl = module_list->at(i);
|
|
Symbol* module_cpl_name = module_cpl->module_name();
|
|
|
|
if (module_cpl_name->fast_compare(class_module_name) == 0) {
|
|
// Class' module has been located.
|
|
return module_cpl->module_first_entry();
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
// Search either the patch-module or exploded build entries for class.
|
|
ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
|
|
const char* const class_name,
|
|
const char* const file_name,
|
|
TRAPS) {
|
|
ClassFileStream* stream = NULL;
|
|
|
|
// Find the class' defining module in the boot loader's module entry table
|
|
TempNewSymbol class_name_symbol = SymbolTable::new_symbol(class_name);
|
|
TempNewSymbol pkg_name = package_from_class_name(class_name_symbol);
|
|
PackageEntry* pkg_entry = get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data());
|
|
ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
|
|
|
|
// If the module system has not defined java.base yet, then
|
|
// classes loaded are assumed to be defined to java.base.
|
|
// When java.base is eventually defined by the module system,
|
|
// all packages of classes that have been previously loaded
|
|
// are verified in ModuleEntryTable::verify_javabase_packages().
|
|
if (!Universe::is_module_initialized() &&
|
|
!ModuleEntryTable::javabase_defined() &&
|
|
mod_entry == NULL) {
|
|
mod_entry = ModuleEntryTable::javabase_moduleEntry();
|
|
}
|
|
|
|
// The module must be a named module
|
|
ClassPathEntry* e = NULL;
|
|
if (mod_entry != NULL && mod_entry->is_named()) {
|
|
if (module_list == _exploded_entries) {
|
|
// The exploded build entries can be added to at any time so a lock is
|
|
// needed when searching them.
|
|
assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
|
|
MutexLocker ml(THREAD, Module_lock);
|
|
e = find_first_module_cpe(mod_entry, module_list);
|
|
} else {
|
|
e = find_first_module_cpe(mod_entry, module_list);
|
|
}
|
|
}
|
|
|
|
// Try to load the class from the module's ClassPathEntry list.
|
|
while (e != NULL) {
|
|
stream = e->open_stream(file_name, CHECK_NULL);
|
|
// No context.check is required since CDS is not supported
|
|
// for an exploded modules build or if --patch-module is specified.
|
|
if (NULL != stream) {
|
|
return stream;
|
|
}
|
|
e = e->next();
|
|
}
|
|
// If the module was located, break out even if the class was not
|
|
// located successfully from that module's ClassPathEntry list.
|
|
// There will not be another valid entry for that module.
|
|
return NULL;
|
|
}
|
|
|
|
// Called by the boot classloader to load classes
|
|
InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
|
|
assert(name != NULL, "invariant");
|
|
assert(THREAD->is_Java_thread(), "must be a JavaThread");
|
|
|
|
ResourceMark rm(THREAD);
|
|
HandleMark hm(THREAD);
|
|
|
|
const char* const class_name = name->as_C_string();
|
|
|
|
EventMark m("loading class %s", class_name);
|
|
|
|
const char* const file_name = file_name_for_class_name(class_name,
|
|
name->utf8_length());
|
|
assert(file_name != NULL, "invariant");
|
|
|
|
// Lookup stream for parsing .class file
|
|
ClassFileStream* stream = NULL;
|
|
s2 classpath_index = 0;
|
|
ClassPathEntry* e = NULL;
|
|
|
|
// If search_append_only is true, boot loader visibility boundaries are
|
|
// set to be _first_append_entry to the end. This includes:
|
|
// [-Xbootclasspath/a]; [jvmti appended entries]
|
|
//
|
|
// If search_append_only is false, boot loader visibility boundaries are
|
|
// set to be the --patch-module entries plus the base piece. This includes:
|
|
// [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
|
|
//
|
|
|
|
// Load Attempt #1: --patch-module
|
|
// Determine the class' defining module. If it appears in the _patch_mod_entries,
|
|
// attempt to load the class from those locations specific to the module.
|
|
// Specifications to --patch-module can contain a partial number of classes
|
|
// that are part of the overall module definition. So if a particular class is not
|
|
// 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) {
|
|
// At CDS dump time, the --patch-module entries are ignored. That means a
|
|
// class is still loaded from the runtime image even if it might
|
|
// appear in the _patch_mod_entries. The runtime shared class visibility
|
|
// check will determine if a shared class is visible based on the runtime
|
|
// environemnt, including the runtime --patch-module setting.
|
|
//
|
|
// DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
|
|
// is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
|
|
assert(!DynamicDumpSharedSpaces, "sanity");
|
|
if (!DumpSharedSpaces) {
|
|
stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
|
|
}
|
|
}
|
|
|
|
// Load Attempt #2: [jimage | exploded build]
|
|
if (!search_append_only && (NULL == stream)) {
|
|
if (has_jrt_entry()) {
|
|
e = _jrt_entry;
|
|
stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
|
|
} else {
|
|
// Exploded build - attempt to locate class in its defining module's location.
|
|
assert(_exploded_entries != NULL, "No exploded build entries present");
|
|
stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
|
|
}
|
|
}
|
|
|
|
// Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
|
|
if (search_append_only && (NULL == stream)) {
|
|
// For the boot loader append path search, the starting classpath_index
|
|
// for the appended piece is always 1 to account for either the
|
|
// _jrt_entry or the _exploded_entries.
|
|
assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
|
|
classpath_index = 1;
|
|
|
|
e = _first_append_entry;
|
|
while (e != NULL) {
|
|
stream = e->open_stream(file_name, CHECK_NULL);
|
|
if (NULL != stream) {
|
|
break;
|
|
}
|
|
e = e->next();
|
|
++classpath_index;
|
|
}
|
|
}
|
|
|
|
if (NULL == stream) {
|
|
return NULL;
|
|
}
|
|
|
|
stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
|
|
|
|
ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
|
|
Handle protection_domain;
|
|
ClassLoadInfo cl_info(protection_domain);
|
|
|
|
InstanceKlass* result = KlassFactory::create_from_stream(stream,
|
|
name,
|
|
loader_data,
|
|
cl_info,
|
|
THREAD);
|
|
if (HAS_PENDING_EXCEPTION) {
|
|
if (DumpSharedSpaces) {
|
|
log_error(cds)("Preload Error: Failed to load %s", class_name);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
result->set_classpath_index(classpath_index, THREAD);
|
|
return result;
|
|
}
|
|
|
|
#if INCLUDE_CDS
|
|
char* ClassLoader::skip_uri_protocol(char* source) {
|
|
if (strncmp(source, "file:", 5) == 0) {
|
|
// file: protocol path could start with file:/ or file:///
|
|
// locate the char after all the forward slashes
|
|
int offset = 5;
|
|
while (*(source + offset) == '/') {
|
|
offset++;
|
|
}
|
|
source += offset;
|
|
// for non-windows platforms, move back one char as the path begins with a '/'
|
|
#ifndef _WINDOWS
|
|
source -= 1;
|
|
#endif
|
|
} else if (strncmp(source, "jrt:/", 5) == 0) {
|
|
source += 5;
|
|
}
|
|
return source;
|
|
}
|
|
|
|
// Record the shared classpath index and loader type for classes loaded
|
|
// by the builtin loaders at dump time.
|
|
void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
|
|
Arguments::assert_is_dumping_archive();
|
|
assert(stream != NULL, "sanity");
|
|
|
|
if (ik->is_hidden() || ik->is_unsafe_anonymous()) {
|
|
// We do not archive hidden or unsafe anonymous classes.
|
|
return;
|
|
}
|
|
|
|
oop loader = ik->class_loader();
|
|
char* src = (char*)stream->source();
|
|
if (src == NULL) {
|
|
if (loader == NULL) {
|
|
// JFR classes
|
|
ik->set_shared_classpath_index(0);
|
|
ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
|
|
}
|
|
return;
|
|
}
|
|
|
|
assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
|
|
|
|
ResourceMark rm(THREAD);
|
|
int classpath_index = -1;
|
|
PackageEntry* pkg_entry = ik->package();
|
|
|
|
if (FileMapInfo::get_number_of_shared_paths() > 0) {
|
|
char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
|
|
|
|
// save the path from the file: protocol or the module name from the jrt: protocol
|
|
// if no protocol prefix is found, path is the same as stream->source()
|
|
char* path = skip_uri_protocol(src);
|
|
char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
|
|
bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
|
|
// The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
|
|
// such as ClassLoader::load_class(), its source path must be valid.
|
|
assert(success, "must be valid path");
|
|
for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
|
|
SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
|
|
success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
|
|
// A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
|
|
// it must be valid here.
|
|
assert(success, "must be valid path");
|
|
// If the path (from the class stream source) is the same as the shared
|
|
// class or module path, then we have a match.
|
|
if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
|
|
// NULL pkg_entry and pkg_entry in an unnamed module implies the class
|
|
// is from the -cp or boot loader append path which consists of -Xbootclasspath/a
|
|
// and jvmti appended entries.
|
|
if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
|
|
// Ensure the index is within the -cp range before assigning
|
|
// to the classpath_index.
|
|
if (SystemDictionary::is_system_class_loader(loader) &&
|
|
(i >= ClassLoaderExt::app_class_paths_start_index()) &&
|
|
(i < ClassLoaderExt::app_module_paths_start_index())) {
|
|
classpath_index = i;
|
|
break;
|
|
} else {
|
|
if ((i >= 1) &&
|
|
(i < ClassLoaderExt::app_class_paths_start_index())) {
|
|
// The class must be from boot loader append path which consists of
|
|
// -Xbootclasspath/a and jvmti appended entries.
|
|
assert(loader == NULL, "sanity");
|
|
classpath_index = i;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
// A class from a named module from the --module-path. Ensure the index is
|
|
// within the --module-path range before assigning to the classpath_index.
|
|
if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
|
|
if (i >= ClassLoaderExt::app_module_paths_start_index() &&
|
|
i < FileMapInfo::get_number_of_shared_paths()) {
|
|
classpath_index = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// for index 0 and the stream->source() is the modules image or has the jrt: protocol.
|
|
// The class must be from the runtime modules image.
|
|
if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
|
|
classpath_index = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// No path entry found for this class. Must be a shared class loaded by the
|
|
// user defined classloader.
|
|
if (classpath_index < 0) {
|
|
assert(ik->shared_classpath_index() < 0, "Sanity");
|
|
ik->set_shared_classpath_index(UNREGISTERED_INDEX);
|
|
SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
|
|
return;
|
|
}
|
|
} else {
|
|
// The shared path table is set up after module system initialization.
|
|
// The path table contains no entry before that. Any classes loaded prior
|
|
// to the setup of the shared path table must be from the modules image.
|
|
assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
|
|
assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
|
|
classpath_index = 0;
|
|
}
|
|
|
|
const char* const class_name = ik->name()->as_C_string();
|
|
const char* const file_name = file_name_for_class_name(class_name,
|
|
ik->name()->utf8_length());
|
|
assert(file_name != NULL, "invariant");
|
|
|
|
ClassLoaderExt::record_result(classpath_index, ik, THREAD);
|
|
}
|
|
#endif // INCLUDE_CDS
|
|
|
|
// Initialize the class loader's access to methods in libzip. Parse and
|
|
// process the boot classpath into a list ClassPathEntry objects. Once
|
|
// this list has been created, it must not change order (see class PackageInfo)
|
|
// it can be appended to and is by jvmti and the kernel vm.
|
|
|
|
void ClassLoader::initialize() {
|
|
EXCEPTION_MARK;
|
|
|
|
if (UsePerfData) {
|
|
// jvmstat performance counters
|
|
NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
|
|
NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
|
|
NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
|
|
NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
|
|
NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
|
|
NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
|
|
NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
|
|
NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
|
|
NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
|
|
NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
|
|
|
|
NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
|
|
NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
|
|
NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
|
|
NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
|
|
NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
|
|
NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
|
|
NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
|
|
NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
|
|
NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
|
|
NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
|
|
NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
|
|
|
|
|
|
// The following performance counters are added for measuring the impact
|
|
// of the bug fix of 6365597. They are mainly focused on finding out
|
|
// the behavior of system & user-defined classloader lock, whether
|
|
// ClassLoader.loadClass/findClass is being called synchronized or not.
|
|
NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
|
|
"systemLoaderLockContentionRate");
|
|
NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
|
|
"nonSystemLoaderLockContentionRate");
|
|
NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
|
|
"jvmFindLoadedClassNoLockCalls");
|
|
NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
|
|
"jvmDefineClassNoLockCalls");
|
|
|
|
NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
|
|
"jniDefineClassNoLockCalls");
|
|
|
|
NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
|
|
"unsafeDefineClassCalls");
|
|
}
|
|
|
|
// lookup java library entry points
|
|
load_java_library();
|
|
// jimage library entry points are loaded below, in lookup_vm_options
|
|
setup_bootstrap_search_path();
|
|
}
|
|
|
|
char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
|
|
jlong size;
|
|
JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
|
|
if (location == 0)
|
|
return NULL;
|
|
char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
|
|
(*JImageGetResource)(jimage, location, val, size);
|
|
val[size] = '\0';
|
|
return val;
|
|
}
|
|
|
|
// Lookup VM options embedded in the modules jimage file
|
|
char* ClassLoader::lookup_vm_options() {
|
|
jint error;
|
|
char modules_path[JVM_MAXPATHLEN];
|
|
const char* fileSep = os::file_separator();
|
|
|
|
// Initialize jimage library entry points
|
|
load_jimage_library();
|
|
|
|
jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
|
|
JImageFile* jimage =(*JImageOpen)(modules_path, &error);
|
|
if (jimage == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
const char *jimage_version = get_jimage_version_string();
|
|
char *options = lookup_vm_resource(jimage, jimage_version, "jdk/internal/vm/options");
|
|
|
|
(*JImageClose)(jimage);
|
|
return options;
|
|
}
|
|
|
|
#if INCLUDE_CDS
|
|
void ClassLoader::initialize_shared_path() {
|
|
if (Arguments::is_dumping_archive()) {
|
|
ClassLoaderExt::setup_search_paths();
|
|
}
|
|
}
|
|
|
|
void ClassLoader::initialize_module_path(TRAPS) {
|
|
if (Arguments::is_dumping_archive()) {
|
|
ClassLoaderExt::setup_module_paths(THREAD);
|
|
FileMapInfo::allocate_shared_path_table();
|
|
}
|
|
}
|
|
|
|
// Helper function used by CDS code to get the number of module path
|
|
// entries during shared classpath setup time.
|
|
int ClassLoader::num_module_path_entries() {
|
|
Arguments::assert_is_dumping_archive();
|
|
int num_entries = 0;
|
|
ClassPathEntry* e= ClassLoader::_module_path_entries;
|
|
while (e != NULL) {
|
|
num_entries ++;
|
|
e = e->next();
|
|
}
|
|
return num_entries;
|
|
}
|
|
#endif
|
|
|
|
jlong ClassLoader::classloader_time_ms() {
|
|
return UsePerfData ?
|
|
Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
|
|
}
|
|
|
|
jlong ClassLoader::class_init_count() {
|
|
return UsePerfData ? _perf_classes_inited->get_value() : -1;
|
|
}
|
|
|
|
jlong ClassLoader::class_init_time_ms() {
|
|
return UsePerfData ?
|
|
Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
|
|
}
|
|
|
|
jlong ClassLoader::class_verify_time_ms() {
|
|
return UsePerfData ?
|
|
Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
|
|
}
|
|
|
|
jlong ClassLoader::class_link_count() {
|
|
return UsePerfData ? _perf_classes_linked->get_value() : -1;
|
|
}
|
|
|
|
jlong ClassLoader::class_link_time_ms() {
|
|
return UsePerfData ?
|
|
Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
|
|
}
|
|
|
|
int ClassLoader::compute_Object_vtable() {
|
|
// hardwired for JDK1.2 -- would need to duplicate class file parsing
|
|
// code to determine actual value from file
|
|
// Would be value '11' if finals were in vtable
|
|
int JDK_1_2_Object_vtable_size = 5;
|
|
return JDK_1_2_Object_vtable_size * vtableEntry::size();
|
|
}
|
|
|
|
|
|
void classLoader_init1() {
|
|
ClassLoader::initialize();
|
|
}
|
|
|
|
// Complete the ClassPathEntry setup for the boot loader
|
|
void ClassLoader::classLoader_init2(TRAPS) {
|
|
// Setup the list of module/path pairs for --patch-module processing
|
|
// This must be done after the SymbolTable is created in order
|
|
// to use fast_compare on module names instead of a string compare.
|
|
if (Arguments::get_patch_mod_prefix() != NULL) {
|
|
setup_patch_mod_entries();
|
|
}
|
|
|
|
// Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
|
|
// to successfully determine if java.base has been patched)
|
|
create_javabase();
|
|
|
|
// Setup the initial java.base/path pair for the exploded build entries.
|
|
// As more modules are defined during module system initialization, more
|
|
// entries will be added to the exploded build array.
|
|
if (!has_jrt_entry()) {
|
|
assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
|
|
assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
|
|
assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
|
|
// Set up the boot loader's _exploded_entries list. Note that this gets
|
|
// done before loading any classes, by the same thread that will
|
|
// subsequently do the first class load. So, no lock is needed for this.
|
|
assert(_exploded_entries == NULL, "Should only get initialized once");
|
|
_exploded_entries = new (ResourceObj::C_HEAP, mtModule)
|
|
GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
|
|
add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
|
|
}
|
|
}
|
|
|
|
bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
|
|
assert(orig != NULL && out != NULL && len > 0, "bad arguments");
|
|
JavaThread* THREAD = JavaThread::current();
|
|
ResourceMark rm(THREAD);
|
|
|
|
// os::native_path writes into orig_copy
|
|
char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
|
|
strcpy(orig_copy, orig);
|
|
if ((CanonicalizeEntry)(os::native_path(orig_copy), out, len) < 0) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void ClassLoader::create_javabase() {
|
|
Thread* THREAD = Thread::current();
|
|
|
|
// Create java.base's module entry for the boot
|
|
// class loader prior to loading j.l.Ojbect.
|
|
ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
|
|
|
|
// Get module entry table
|
|
ModuleEntryTable* null_cld_modules = null_cld->modules();
|
|
if (null_cld_modules == NULL) {
|
|
vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
|
|
}
|
|
|
|
{
|
|
MutexLocker ml(THREAD, Module_lock);
|
|
if (ModuleEntryTable::javabase_moduleEntry() == NULL) { // may have been inited by CDS.
|
|
ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
|
|
false, vmSymbols::java_base(), NULL, NULL, null_cld);
|
|
if (jb_module == NULL) {
|
|
vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
|
|
}
|
|
ModuleEntryTable::set_javabase_moduleEntry(jb_module);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Please keep following two functions at end of this file. With them placed at top or in middle of the file,
|
|
// they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
|
|
void PerfClassTraceTime::initialize() {
|
|
if (!UsePerfData) return;
|
|
|
|
if (_eventp != NULL) {
|
|
// increment the event counter
|
|
_eventp->inc();
|
|
}
|
|
|
|
// stop the current active thread-local timer to measure inclusive time
|
|
_prev_active_event = -1;
|
|
for (int i=0; i < EVENT_TYPE_COUNT; i++) {
|
|
if (_timers[i].is_active()) {
|
|
assert(_prev_active_event == -1, "should have only one active timer");
|
|
_prev_active_event = i;
|
|
_timers[i].stop();
|
|
}
|
|
}
|
|
|
|
if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
|
|
// start the inclusive timer if not recursively called
|
|
_t.start();
|
|
}
|
|
|
|
// start thread-local timer of the given event type
|
|
if (!_timers[_event_type].is_active()) {
|
|
_timers[_event_type].start();
|
|
}
|
|
}
|
|
|
|
PerfClassTraceTime::~PerfClassTraceTime() {
|
|
if (!UsePerfData) return;
|
|
|
|
// stop the thread-local timer as the event completes
|
|
// and resume the thread-local timer of the event next on the stack
|
|
_timers[_event_type].stop();
|
|
jlong selftime = _timers[_event_type].ticks();
|
|
|
|
if (_prev_active_event >= 0) {
|
|
_timers[_prev_active_event].start();
|
|
}
|
|
|
|
if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
|
|
|
|
// increment the counters only on the leaf call
|
|
_t.stop();
|
|
_timep->inc(_t.ticks());
|
|
if (_selftimep != NULL) {
|
|
_selftimep->inc(selftime);
|
|
}
|
|
// add all class loading related event selftime to the accumulated time counter
|
|
ClassLoader::perf_accumulated_time()->inc(selftime);
|
|
|
|
// reset the timer
|
|
_timers[_event_type].reset();
|
|
}
|