412 lines
16 KiB
C++
412 lines
16 KiB
C++
/*
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* Copyright (c) 1997, 2014, 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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#ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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#define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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#include "classfile/classFileParser.hpp"
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#include "runtime/perfData.hpp"
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// The VM class loader.
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#include <sys/stat.h>
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// Meta-index (optional, to be able to skip opening boot classpath jar files)
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class MetaIndex: public CHeapObj<mtClass> {
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private:
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char** _meta_package_names;
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int _num_meta_package_names;
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public:
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MetaIndex(char** meta_package_names, int num_meta_package_names);
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~MetaIndex();
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bool may_contain(const char* class_name);
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};
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// Class path entry (directory or zip file)
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class ClassPathEntry: public CHeapObj<mtClass> {
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private:
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ClassPathEntry* _next;
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public:
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// Next entry in class path
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ClassPathEntry* next() { return _next; }
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void set_next(ClassPathEntry* next) {
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// may have unlocked readers, so write atomically.
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OrderAccess::release_store_ptr(&_next, next);
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}
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virtual bool is_jar_file() = 0;
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virtual const char* name() = 0;
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virtual bool is_lazy();
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// Constructor
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ClassPathEntry();
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// Attempt to locate file_name through this class path entry.
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// Returns a class file parsing stream if successfull.
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virtual ClassFileStream* open_stream(const char* name, TRAPS) = 0;
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// Debugging
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NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
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NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
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};
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class ClassPathDirEntry: public ClassPathEntry {
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private:
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char* _dir; // Name of directory
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public:
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bool is_jar_file() { return false; }
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const char* name() { return _dir; }
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ClassPathDirEntry(char* dir);
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ClassFileStream* open_stream(const char* name, TRAPS);
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// Debugging
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NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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NOT_PRODUCT(bool is_rt_jar();)
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};
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// Type definitions for zip file and zip file entry
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typedef void* jzfile;
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typedef struct {
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char *name; /* entry name */
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jlong time; /* modification time */
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jlong size; /* size of uncompressed data */
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jlong csize; /* size of compressed data (zero if uncompressed) */
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jint crc; /* crc of uncompressed data */
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char *comment; /* optional zip file comment */
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jbyte *extra; /* optional extra data */
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jlong pos; /* position of LOC header (if negative) or data */
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} jzentry;
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class ClassPathZipEntry: public ClassPathEntry {
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private:
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jzfile* _zip; // The zip archive
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char* _zip_name; // Name of zip archive
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public:
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bool is_jar_file() { return true; }
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const char* name() { return _zip_name; }
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ClassPathZipEntry(jzfile* zip, const char* zip_name);
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~ClassPathZipEntry();
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ClassFileStream* open_stream(const char* name, TRAPS);
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void contents_do(void f(const char* name, void* context), void* context);
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// Debugging
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NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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NOT_PRODUCT(bool is_rt_jar();)
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};
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// For lazier loading of boot class path entries
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class LazyClassPathEntry: public ClassPathEntry {
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private:
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char* _path; // dir or file
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struct stat _st;
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MetaIndex* _meta_index;
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bool _has_error;
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volatile ClassPathEntry* _resolved_entry;
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ClassPathEntry* resolve_entry(TRAPS);
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public:
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bool is_jar_file();
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const char* name() { return _path; }
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LazyClassPathEntry(char* path, const struct stat* st);
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ClassFileStream* open_stream(const char* name, TRAPS);
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void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
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virtual bool is_lazy();
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// Debugging
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NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
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NOT_PRODUCT(bool is_rt_jar();)
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};
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class PackageHashtable;
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class PackageInfo;
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template <MEMFLAGS F> class HashtableBucket;
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class ClassLoader: AllStatic {
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public:
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enum SomeConstants {
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package_hash_table_size = 31 // Number of buckets
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};
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private:
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friend class LazyClassPathEntry;
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// Performance counters
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static PerfCounter* _perf_accumulated_time;
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static PerfCounter* _perf_classes_inited;
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static PerfCounter* _perf_class_init_time;
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static PerfCounter* _perf_class_init_selftime;
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static PerfCounter* _perf_classes_verified;
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static PerfCounter* _perf_class_verify_time;
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static PerfCounter* _perf_class_verify_selftime;
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static PerfCounter* _perf_classes_linked;
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static PerfCounter* _perf_class_link_time;
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static PerfCounter* _perf_class_link_selftime;
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static PerfCounter* _perf_class_parse_time;
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static PerfCounter* _perf_class_parse_selftime;
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static PerfCounter* _perf_sys_class_lookup_time;
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static PerfCounter* _perf_shared_classload_time;
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static PerfCounter* _perf_sys_classload_time;
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static PerfCounter* _perf_app_classload_time;
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static PerfCounter* _perf_app_classload_selftime;
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static PerfCounter* _perf_app_classload_count;
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static PerfCounter* _perf_define_appclasses;
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static PerfCounter* _perf_define_appclass_time;
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static PerfCounter* _perf_define_appclass_selftime;
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static PerfCounter* _perf_app_classfile_bytes_read;
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static PerfCounter* _perf_sys_classfile_bytes_read;
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static PerfCounter* _sync_systemLoaderLockContentionRate;
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static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
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static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
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static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
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static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
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static PerfCounter* _unsafe_defineClassCallCounter;
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static PerfCounter* _isUnsyncloadClass;
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static PerfCounter* _load_instance_class_failCounter;
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// First entry in linked list of ClassPathEntry instances
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static ClassPathEntry* _first_entry;
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// Last entry in linked list of ClassPathEntry instances
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static ClassPathEntry* _last_entry;
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// Hash table used to keep track of loaded packages
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static PackageHashtable* _package_hash_table;
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static const char* _shared_archive;
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// Hash function
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static unsigned int hash(const char *s, int n);
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// Returns the package file name corresponding to the specified package
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// or class name, or null if not found.
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static PackageInfo* lookup_package(const char *pkgname);
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// Adds a new package entry for the specified class or package name and
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// corresponding directory or jar file name.
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static bool add_package(const char *pkgname, int classpath_index, TRAPS);
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// Initialization
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static void setup_meta_index();
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static void setup_bootstrap_search_path();
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static void load_zip_library();
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static ClassPathEntry* create_class_path_entry(char *path, const struct stat* st,
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bool lazy, TRAPS);
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// Canonicalizes path names, so strcmp will work properly. This is mainly
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// to avoid confusing the zip library
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static bool get_canonical_path(char* orig, char* out, int len);
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public:
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// Used by the kernel jvm.
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static void update_class_path_entry_list(char *path,
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bool check_for_duplicates);
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static void print_bootclasspath();
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// Timing
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static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
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static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
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static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
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static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; }
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static PerfCounter* perf_classes_verified() { return _perf_classes_verified; }
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static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
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static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; }
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static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
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static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
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static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; }
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static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; }
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static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; }
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static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; }
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static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; }
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static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; }
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static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; }
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static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; }
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static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; }
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static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; }
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static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; }
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static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
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static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
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static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
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// Record how often system loader lock object is contended
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static PerfCounter* sync_systemLoaderLockContentionRate() {
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return _sync_systemLoaderLockContentionRate;
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}
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// Record how often non system loader lock object is contended
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static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
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return _sync_nonSystemLoaderLockContentionRate;
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}
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// Record how many calls to JVM_FindLoadedClass w/o holding a lock
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static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
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return _sync_JVMFindLoadedClassLockFreeCounter;
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}
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// Record how many calls to JVM_DefineClass w/o holding a lock
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static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
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return _sync_JVMDefineClassLockFreeCounter;
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}
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// Record how many calls to jni_DefineClass w/o holding a lock
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static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
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return _sync_JNIDefineClassLockFreeCounter;
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}
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// Record how many calls to Unsafe_DefineClass
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static PerfCounter* unsafe_defineClassCallCounter() {
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return _unsafe_defineClassCallCounter;
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}
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// Record how many times SystemDictionary::load_instance_class call
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// fails with linkageError when Unsyncloadclass flag is set.
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static PerfCounter* load_instance_class_failCounter() {
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return _load_instance_class_failCounter;
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}
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// Load individual .class file
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static instanceKlassHandle load_classfile(Symbol* h_name, TRAPS);
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// If the specified package has been loaded by the system, then returns
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// the name of the directory or ZIP file that the package was loaded from.
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// Returns null if the package was not loaded.
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// Note: The specified name can either be the name of a class or package.
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// If a package name is specified, then it must be "/"-separator and also
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// end with a trailing "/".
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static oop get_system_package(const char* name, TRAPS);
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// Returns an array of Java strings representing all of the currently
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// loaded system packages.
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// Note: The package names returned are "/"-separated and end with a
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// trailing "/".
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static objArrayOop get_system_packages(TRAPS);
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// Initialization
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static void initialize();
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static void create_package_info_table();
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static void create_package_info_table(HashtableBucket<mtClass> *t, int length,
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int number_of_entries);
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static int compute_Object_vtable();
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static ClassPathEntry* classpath_entry(int n) {
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ClassPathEntry* e = ClassLoader::_first_entry;
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while (--n >= 0) {
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assert(e != NULL, "Not that many classpath entries.");
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e = e->next();
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}
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return e;
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}
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// Sharing dump and restore
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static void copy_package_info_buckets(char** top, char* end);
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static void copy_package_info_table(char** top, char* end);
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// VM monitoring and management support
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static jlong classloader_time_ms();
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static jlong class_method_total_size();
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static jlong class_init_count();
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static jlong class_init_time_ms();
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static jlong class_verify_time_ms();
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static jlong class_link_count();
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static jlong class_link_time_ms();
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// indicates if class path already contains a entry (exact match by name)
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static bool contains_entry(ClassPathEntry* entry);
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// adds a class path list
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static void add_to_list(ClassPathEntry* new_entry);
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// creates a class path zip entry (returns NULL if JAR file cannot be opened)
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static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
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// Debugging
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static void verify() PRODUCT_RETURN;
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// Force compilation of all methods in all classes in bootstrap class path (stress test)
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#ifndef PRODUCT
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private:
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static int _compile_the_world_class_counter;
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static int _compile_the_world_method_counter;
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public:
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static void compile_the_world();
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static void compile_the_world_in(char* name, Handle loader, TRAPS);
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static int compile_the_world_counter() { return _compile_the_world_class_counter; }
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#endif //PRODUCT
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};
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// PerfClassTraceTime is used to measure time for class loading related events.
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// This class tracks cumulative time and exclusive time for specific event types.
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// During the execution of one event, other event types (e.g. class loading and
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// resolution) as well as recursive calls of the same event type could happen.
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// Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
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// (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
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// instances have been created as multiple events are happening.
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class PerfClassTraceTime {
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public:
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enum {
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CLASS_LOAD = 0,
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PARSE_CLASS = 1,
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CLASS_LINK = 2,
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CLASS_VERIFY = 3,
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CLASS_CLINIT = 4,
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DEFINE_CLASS = 5,
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EVENT_TYPE_COUNT = 6
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};
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protected:
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// _t tracks time from initialization to destruction of this timer instance
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// including time for all other event types, and recursive calls of this type.
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// When a timer is called recursively, the elapsedTimer _t would not be used.
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elapsedTimer _t;
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PerfLongCounter* _timep;
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PerfLongCounter* _selftimep;
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PerfLongCounter* _eventp;
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// pointer to thread-local recursion counter and timer array
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// The thread_local timers track cumulative time for specific event types
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// exclusive of time for other event types, but including recursive calls
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// of the same type.
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int* _recursion_counters;
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elapsedTimer* _timers;
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int _event_type;
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int _prev_active_event;
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public:
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inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
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PerfLongCounter* selftimep, /* counter incremented with exclusive time */
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PerfLongCounter* eventp, /* event counter */
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int* recursion_counters, /* thread-local recursion counter array */
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elapsedTimer* timers, /* thread-local timer array */
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int type /* event type */ ) :
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_timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
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initialize();
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}
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inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
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elapsedTimer* timers, /* thread-local timer array */
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int type /* event type */ ) :
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_timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
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initialize();
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}
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inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
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inline void resume() { _t.start(); _timers[_event_type].start(); }
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~PerfClassTraceTime();
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void initialize();
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};
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#endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP
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