514 lines
22 KiB
C++
514 lines
22 KiB
C++
/*
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* Copyright (c) 1997, 2019, 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_CLASSFILE_CLASSLOADER_HPP
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#define SHARE_CLASSFILE_CLASSLOADER_HPP
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#include "jimage.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/perfData.hpp"
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#include "utilities/exceptions.hpp"
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#include "utilities/macros.hpp"
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// The VM class loader.
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#include <sys/stat.h>
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// Name of boot "modules" image
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#define MODULES_IMAGE_NAME "modules"
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// Class path entry (directory or zip file)
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class JImageFile;
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class ClassFileStream;
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class PackageEntry;
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template <typename T> class GrowableArray;
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class ClassPathEntry : public CHeapObj<mtClass> {
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private:
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ClassPathEntry* volatile _next;
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protected:
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const char* copy_path(const char*path);
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public:
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ClassPathEntry* next() const;
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virtual ~ClassPathEntry() {}
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void set_next(ClassPathEntry* next);
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virtual bool is_modules_image() const { return false; }
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virtual bool is_jar_file() const { return false; }
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// Is this entry created from the "Class-path" attribute from a JAR Manifest?
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virtual bool from_class_path_attr() const { return false; }
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virtual const char* name() const = 0;
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virtual JImageFile* jimage() const { return NULL; }
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virtual void close_jimage() {}
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// Constructor
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ClassPathEntry() : _next(NULL) {}
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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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// Open the stream for a specific class loader
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virtual ClassFileStream* open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
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return open_stream(name, THREAD);
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}
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};
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class ClassPathDirEntry: public ClassPathEntry {
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private:
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const char* _dir; // Name of directory
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public:
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const char* name() const { return _dir; }
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ClassPathDirEntry(const char* dir) {
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_dir = copy_path(dir);
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}
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virtual ~ClassPathDirEntry() {}
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ClassFileStream* open_stream(const char* name, TRAPS);
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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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const char* _zip_name; // Name of zip archive
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bool _from_class_path_attr; // From the "Class-path" attribute of a jar file
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public:
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bool is_jar_file() const { return true; }
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bool from_class_path_attr() const { return _from_class_path_attr; }
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const char* name() const { return _zip_name; }
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ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append, bool from_class_path_attr);
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virtual ~ClassPathZipEntry();
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u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
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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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};
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// For java image files
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class ClassPathImageEntry: public ClassPathEntry {
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private:
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JImageFile* _jimage;
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const char* _name;
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DEBUG_ONLY(static ClassPathImageEntry* _singleton;)
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public:
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bool is_modules_image() const;
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bool is_open() const { return _jimage != NULL; }
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const char* name() const { return _name == NULL ? "" : _name; }
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JImageFile* jimage() const { return _jimage; }
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void close_jimage();
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ClassPathImageEntry(JImageFile* jimage, const char* name);
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virtual ~ClassPathImageEntry();
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ClassFileStream* open_stream(const char* name, TRAPS);
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ClassFileStream* open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS);
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};
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// ModuleClassPathList contains a linked list of ClassPathEntry's
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// that have been specified for a specific module. Currently,
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// the only way to specify a module/path pair is via the --patch-module
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// command line option.
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class ModuleClassPathList : public CHeapObj<mtClass> {
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private:
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Symbol* _module_name;
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// First and last entries of class path entries for a specific module
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ClassPathEntry* _module_first_entry;
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ClassPathEntry* _module_last_entry;
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public:
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Symbol* module_name() const { return _module_name; }
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ClassPathEntry* module_first_entry() const { return _module_first_entry; }
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ModuleClassPathList(Symbol* module_name);
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~ModuleClassPathList();
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void add_to_list(ClassPathEntry* new_entry);
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};
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class ClassLoader: AllStatic {
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public:
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enum ClassLoaderType {
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BOOT_LOADER = 1, /* boot loader */
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PLATFORM_LOADER = 2, /* PlatformClassLoader */
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APP_LOADER = 3 /* AppClassLoader */
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};
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protected:
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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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// The boot class path consists of 3 ordered pieces:
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// 1. the module/path pairs specified to --patch-module
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// --patch-module=<module>=<file>(<pathsep><file>)*
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// 2. the base piece
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// [jimage | build with exploded modules]
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// 3. boot loader append path
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// [-Xbootclasspath/a]; [jvmti appended entries]
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//
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// The boot loader must obey this order when attempting
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// to load a class.
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// 1. Contains the module/path pairs specified to --patch-module
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static GrowableArray<ModuleClassPathList*>* _patch_mod_entries;
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// 2. the base piece
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// Contains the ClassPathEntry of the modular java runtime image.
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// If no java runtime image is present, this indicates a
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// build with exploded modules is being used instead.
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static ClassPathEntry* _jrt_entry;
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static GrowableArray<ModuleClassPathList*>* _exploded_entries;
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enum { EXPLODED_ENTRY_SIZE = 80 }; // Initial number of exploded modules
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// 3. the boot loader's append path
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// [-Xbootclasspath/a]; [jvmti appended entries]
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// Note: boot loader append path does not support named modules.
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static ClassPathEntry* _first_append_entry;
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// Last entry in linked list of appended ClassPathEntry instances
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static ClassPathEntry* _last_append_entry;
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// Info used by CDS
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CDS_ONLY(static ClassPathEntry* _app_classpath_entries;)
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CDS_ONLY(static ClassPathEntry* _last_app_classpath_entry;)
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CDS_ONLY(static ClassPathEntry* _module_path_entries;)
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CDS_ONLY(static ClassPathEntry* _last_module_path_entry;)
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CDS_ONLY(static void setup_app_search_path(const char* class_path);)
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CDS_ONLY(static void setup_module_search_path(const char* path, TRAPS);)
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static void add_to_app_classpath_entries(const char* path,
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ClassPathEntry* entry,
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bool check_for_duplicates);
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CDS_ONLY(static void add_to_module_path_entries(const char* path,
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ClassPathEntry* entry);)
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public:
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CDS_ONLY(static ClassPathEntry* app_classpath_entries() {return _app_classpath_entries;})
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CDS_ONLY(static ClassPathEntry* module_path_entries() {return _module_path_entries;})
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static bool has_bootclasspath_append() { return _first_append_entry != NULL; }
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protected:
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// Initialization:
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// - setup the boot loader's system class path
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// - setup the boot loader's patch mod entries, if present
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// - create the ModuleEntry for java.base
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static void setup_bootstrap_search_path();
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static void setup_boot_search_path(const char *class_path);
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static void setup_patch_mod_entries();
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static void create_javabase();
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static void* dll_lookup(void* lib, const char* name, const char* path);
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static void load_java_library();
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static void load_zip_library();
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static void load_jimage_library();
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public:
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static ClassPathEntry* create_class_path_entry(const char *path, const struct stat* st,
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bool throw_exception,
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bool is_boot_append,
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bool from_class_path_attr, TRAPS);
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// If the package for the fully qualified class name is in the boot
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// loader's package entry table then add_package() sets the classpath_index
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// field so that get_system_package() will know to return a non-null value
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// for the package's location. And, so that the package will be added to
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// the list of packages returned by get_system_packages().
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// For packages whose classes are loaded from the boot loader class path, the
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// classpath_index indicates which entry on the boot loader class path.
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static bool add_package(const char *fullq_class_name, s2 classpath_index, 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(const char* orig, char* out, int len);
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static const char* file_name_for_class_name(const char* class_name,
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int class_name_len);
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static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS);
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public:
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static int crc32(int crc, const char* buf, int len);
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static bool update_class_path_entry_list(const char *path,
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bool check_for_duplicates,
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bool is_boot_append,
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bool from_class_path_attr,
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bool throw_exception=true);
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CDS_ONLY(static void update_module_path_entry_list(const char *path, TRAPS);)
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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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// Modular java runtime image is present vs. a build with exploded modules
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static bool has_jrt_entry() { return (_jrt_entry != NULL); }
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static ClassPathEntry* get_jrt_entry() { return _jrt_entry; }
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static void close_jrt_image();
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// Add a module's exploded directory to the boot loader's exploded module build list
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static void add_to_exploded_build_list(Symbol* module_name, TRAPS);
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// Attempt load of individual class from either the patched or exploded modules build lists
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static ClassFileStream* search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
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const char* const class_name,
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const char* const file_name, TRAPS);
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// Load individual .class file
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static InstanceKlass* load_class(Symbol* class_name, bool search_append_only, 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 classLoader_init2(TRAPS);
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CDS_ONLY(static void initialize_shared_path();)
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CDS_ONLY(static void initialize_module_path(TRAPS);)
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static int compute_Object_vtable();
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static ClassPathEntry* classpath_entry(int n);
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static bool is_in_patch_mod_entries(Symbol* module_name);
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#if INCLUDE_CDS
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// Sharing dump and restore
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// Helper function used by CDS code to get the number of boot classpath
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// entries during shared classpath setup time.
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static int num_boot_classpath_entries();
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static ClassPathEntry* get_next_boot_classpath_entry(ClassPathEntry* e);
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// Helper function used by CDS code to get the number of app classpath
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// entries during shared classpath setup time.
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static int num_app_classpath_entries();
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// Helper function used by CDS code to get the number of module path
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// entries during shared classpath setup time.
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static int num_module_path_entries() {
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Arguments::assert_is_dumping_archive();
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int num_entries = 0;
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ClassPathEntry* e= ClassLoader::_module_path_entries;
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while (e != NULL) {
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num_entries ++;
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e = e->next();
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}
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return num_entries;
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}
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static void exit_with_path_failure(const char* error, const char* message);
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static char* skip_uri_protocol(char* source);
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static void record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS);
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#endif
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static char* lookup_vm_options();
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static JImageLocationRef jimage_find_resource(JImageFile* jf, const char* module_name,
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const char* file_name, jlong &size);
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static void trace_class_path(const char* msg, const char* name = NULL);
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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_append_entry(const char* name);
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// adds a class path to the boot append entries
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static void add_to_boot_append_entries(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, bool is_boot_append);
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static bool string_ends_with(const char* str, const char* str_to_find);
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// obtain package name from a fully qualified class name
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// *bad_class_name is set to true if there's a problem with parsing class_name, to
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// distinguish from a class_name with no package name, as both cases have a NULL return value
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static const char* package_from_name(const char* const class_name, bool* bad_class_name = NULL);
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// Debugging
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static void verify() PRODUCT_RETURN;
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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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|
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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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|
|
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inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
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elapsedTimer* timers, /* thread-local timer array */
|
|
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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|
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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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|
|
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~PerfClassTraceTime();
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|
void initialize();
|
|
};
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#endif // SHARE_CLASSFILE_CLASSLOADER_HPP
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