--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/classLoader.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,309 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// The VM class loader.
+#include <sys/stat.h>
+
+
+// Meta-index (optional, to be able to skip opening boot classpath jar files)
+class MetaIndex: public CHeapObj {
+ private:
+ char** _meta_package_names;
+ int _num_meta_package_names;
+ public:
+ MetaIndex(char** meta_package_names, int num_meta_package_names);
+ ~MetaIndex();
+ bool may_contain(const char* class_name);
+};
+
+
+// Class path entry (directory or zip file)
+
+class ClassPathEntry: public CHeapObj {
+ private:
+ ClassPathEntry* _next;
+ public:
+ // Next entry in class path
+ ClassPathEntry* next() { return _next; }
+ void set_next(ClassPathEntry* next) {
+ // may have unlocked readers, so write atomically.
+ OrderAccess::release_store_ptr(&_next, next);
+ }
+ virtual bool is_jar_file() = 0;
+ virtual const char* name() = 0;
+ virtual bool is_lazy();
+ // Constructor
+ ClassPathEntry();
+ // Attempt to locate file_name through this class path entry.
+ // Returns a class file parsing stream if successfull.
+ virtual ClassFileStream* open_stream(const char* name) = 0;
+ // Debugging
+ NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
+ NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
+};
+
+
+class ClassPathDirEntry: public ClassPathEntry {
+ private:
+ char* _dir; // Name of directory
+ public:
+ bool is_jar_file() { return false; }
+ const char* name() { return _dir; }
+ ClassPathDirEntry(char* dir);
+ ClassFileStream* open_stream(const char* name);
+ // Debugging
+ NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
+ NOT_PRODUCT(bool is_rt_jar();)
+};
+
+
+// Type definitions for zip file and zip file entry
+typedef void* jzfile;
+typedef struct {
+ char *name; /* entry name */
+ jlong time; /* modification time */
+ jlong size; /* size of uncompressed data */
+ jlong csize; /* size of compressed data (zero if uncompressed) */
+ jint crc; /* crc of uncompressed data */
+ char *comment; /* optional zip file comment */
+ jbyte *extra; /* optional extra data */
+ jlong pos; /* position of LOC header (if negative) or data */
+} jzentry;
+
+
+class ClassPathZipEntry: public ClassPathEntry {
+ private:
+ jzfile* _zip; // The zip archive
+ char* _zip_name; // Name of zip archive
+ public:
+ bool is_jar_file() { return true; }
+ const char* name() { return _zip_name; }
+ ClassPathZipEntry(jzfile* zip, const char* zip_name);
+ ~ClassPathZipEntry();
+ ClassFileStream* open_stream(const char* name);
+ void contents_do(void f(const char* name, void* context), void* context);
+ // Debugging
+ NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
+ NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
+ NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
+ NOT_PRODUCT(bool is_rt_jar();)
+ NOT_PRODUCT(bool is_rt_jar12();)
+ NOT_PRODUCT(bool is_rt_jar13();)
+};
+
+
+// For lazier loading of boot class path entries
+class LazyClassPathEntry: public ClassPathEntry {
+ private:
+ char* _path; // dir or file
+ struct stat _st;
+ MetaIndex* _meta_index;
+ volatile ClassPathEntry* _resolved_entry;
+ ClassPathEntry* resolve_entry();
+ public:
+ bool is_jar_file();
+ const char* name() { return _path; }
+ LazyClassPathEntry(char* path, struct stat st);
+ ClassFileStream* open_stream(const char* name);
+ void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
+ virtual bool is_lazy();
+ // Debugging
+ NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
+ NOT_PRODUCT(bool is_rt_jar();)
+};
+
+class PackageHashtable;
+class PackageInfo;
+class HashtableBucket;
+
+class ClassLoader: AllStatic {
+ public:
+ enum SomeConstants {
+ package_hash_table_size = 31 // Number of buckets
+ };
+ private:
+ friend class LazyClassPathEntry;
+
+ // Performance counters
+ static PerfCounter* _perf_accumulated_time;
+ static PerfCounter* _perf_classes_inited;
+ static PerfCounter* _perf_class_init_time;
+ static PerfCounter* _perf_class_verify_time;
+ static PerfCounter* _perf_classes_linked;
+ static PerfCounter* _perf_class_link_time;
+
+ static PerfCounter* _sync_systemLoaderLockContentionRate;
+ static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
+ static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
+ static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
+ static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
+
+ static PerfCounter* _unsafe_defineClassCallCounter;
+ static PerfCounter* _isUnsyncloadClass;
+ static PerfCounter* _load_instance_class_failCounter;
+
+ // First entry in linked list of ClassPathEntry instances
+ static ClassPathEntry* _first_entry;
+ // Last entry in linked list of ClassPathEntry instances
+ static ClassPathEntry* _last_entry;
+ // Hash table used to keep track of loaded packages
+ static PackageHashtable* _package_hash_table;
+ static const char* _shared_archive;
+
+ // Hash function
+ static unsigned int hash(const char *s, int n);
+ // Returns the package file name corresponding to the specified package
+ // or class name, or null if not found.
+ static PackageInfo* lookup_package(const char *pkgname);
+ // Adds a new package entry for the specified class or package name and
+ // corresponding directory or jar file name.
+ static bool add_package(const char *pkgname, int classpath_index, TRAPS);
+
+ // Initialization
+ static void setup_meta_index();
+ static void setup_bootstrap_search_path();
+ static void load_zip_library();
+ static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
+
+ // Canonicalizes path names, so strcmp will work properly. This is mainly
+ // to avoid confusing the zip library
+ static bool get_canonical_path(char* orig, char* out, int len);
+ public:
+ // Used by the kernel jvm.
+ static void update_class_path_entry_list(const char *path,
+ bool check_for_duplicates);
+ static void print_bootclasspath();
+
+ // Timing
+ static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
+ static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
+ static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
+ static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
+ static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
+ static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
+
+ // Record how often system loader lock object is contended
+ static PerfCounter* sync_systemLoaderLockContentionRate() {
+ return _sync_systemLoaderLockContentionRate;
+ }
+
+ // Record how often non system loader lock object is contended
+ static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
+ return _sync_nonSystemLoaderLockContentionRate;
+ }
+
+ // Record how many calls to JVM_FindLoadedClass w/o holding a lock
+ static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
+ return _sync_JVMFindLoadedClassLockFreeCounter;
+ }
+
+ // Record how many calls to JVM_DefineClass w/o holding a lock
+ static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
+ return _sync_JVMDefineClassLockFreeCounter;
+ }
+
+ // Record how many calls to jni_DefineClass w/o holding a lock
+ static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
+ return _sync_JNIDefineClassLockFreeCounter;
+ }
+
+ // Record how many calls to Unsafe_DefineClass
+ static PerfCounter* unsafe_defineClassCallCounter() {
+ return _unsafe_defineClassCallCounter;
+ }
+
+ // Record how many times SystemDictionary::load_instance_class call
+ // fails with linkageError when Unsyncloadclass flag is set.
+ static PerfCounter* load_instance_class_failCounter() {
+ return _load_instance_class_failCounter;
+ }
+
+ // Load individual .class file
+ static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
+
+ // If the specified package has been loaded by the system, then returns
+ // the name of the directory or ZIP file that the package was loaded from.
+ // Returns null if the package was not loaded.
+ // Note: The specified name can either be the name of a class or package.
+ // If a package name is specified, then it must be "/"-separator and also
+ // end with a trailing "/".
+ static oop get_system_package(const char* name, TRAPS);
+
+ // Returns an array of Java strings representing all of the currently
+ // loaded system packages.
+ // Note: The package names returned are "/"-separated and end with a
+ // trailing "/".
+ static objArrayOop get_system_packages(TRAPS);
+
+ // Initialization
+ static void initialize();
+ static void create_package_info_table();
+ static void create_package_info_table(HashtableBucket *t, int length,
+ int number_of_entries);
+ static int compute_Object_vtable();
+
+ static ClassPathEntry* classpath_entry(int n) {
+ ClassPathEntry* e = ClassLoader::_first_entry;
+ while (--n >= 0) {
+ assert(e != NULL, "Not that many classpath entries.");
+ e = e->next();
+ }
+ return e;
+ }
+
+ // Sharing dump and restore
+ static void copy_package_info_buckets(char** top, char* end);
+ static void copy_package_info_table(char** top, char* end);
+
+ // VM monitoring and management support
+ static jlong classloader_time_ms();
+ static jlong class_method_total_size();
+ static jlong class_init_count();
+ static jlong class_init_time_ms();
+ static jlong class_verify_time_ms();
+ static jlong class_link_count();
+ static jlong class_link_time_ms();
+
+ // indicates if class path already contains a entry (exact match by name)
+ static bool contains_entry(ClassPathEntry* entry);
+
+ // adds a class path list
+ static void add_to_list(ClassPathEntry* new_entry);
+
+ // creates a class path zip entry (returns NULL if JAR file cannot be opened)
+ static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
+
+ // Debugging
+ static void verify() PRODUCT_RETURN;
+
+ // Force compilation of all methods in all classes in bootstrap class path (stress test)
+#ifndef PRODUCT
+ private:
+ static int _compile_the_world_counter;
+ public:
+ static void compile_the_world();
+ static void compile_the_world_in(char* name, Handle loader, TRAPS);
+ static int compile_the_world_counter() { return _compile_the_world_counter; }
+#endif //PRODUCT
+};