jdk8-mips64-public/hotspot: src/share/vm/classfile/classLoader.hpp@c77d5db18942 (annotated)

src/share/vm/classfile/classLoader.hpp@c77d5db18942 (annotated)

src/share/vm/classfile/classLoader.hpp

Fri, 22 Aug 2014 14:11:46 -0700

author: hseigel
date: Fri, 22 Aug 2014 14:11:46 -0700
changeset 6872: c77d5db18942
parent 6868: ca6d25be853b
child 6876: 710a3c8b516e
child 7241: 8cb56c8cb30d
permissions: -rw-r--r--

8046233: VerifyError on backward branch
Summary: Remove check that causes the VerifyError
Reviewed-by: dholmes, coleenp, acorn

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
 #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
 #include "classfile/classFileParser.hpp"
 #include "runtime/perfData.hpp"
 // 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<mtClass> {
  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<mtClass> {
  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, TRAPS) = 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, TRAPS);
   // 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, TRAPS);
   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;
   bool _has_error;
   volatile ClassPathEntry* _resolved_entry;
   ClassPathEntry* resolve_entry(TRAPS);
  public:
   bool is_jar_file();
   const char* name()  { return _path; }
   LazyClassPathEntry(char* path, const struct stat* st);
   ClassFileStream* open_stream(const char* name, TRAPS);
   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;
 template <MEMFLAGS F> 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_init_selftime;
   static PerfCounter* _perf_classes_verified;
   static PerfCounter* _perf_class_verify_time;
   static PerfCounter* _perf_class_verify_selftime;
   static PerfCounter* _perf_classes_linked;
   static PerfCounter* _perf_class_link_time;
   static PerfCounter* _perf_class_link_selftime;
   static PerfCounter* _perf_class_parse_time;
   static PerfCounter* _perf_class_parse_selftime;
   static PerfCounter* _perf_sys_class_lookup_time;
   static PerfCounter* _perf_shared_classload_time;
   static PerfCounter* _perf_sys_classload_time;
   static PerfCounter* _perf_app_classload_time;
   static PerfCounter* _perf_app_classload_selftime;
   static PerfCounter* _perf_app_classload_count;
   static PerfCounter* _perf_define_appclasses;
   static PerfCounter* _perf_define_appclass_time;
   static PerfCounter* _perf_define_appclass_selftime;
   static PerfCounter* _perf_app_classfile_bytes_read;
   static PerfCounter* _perf_sys_classfile_bytes_read;
   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 ClassPathEntry* create_class_path_entry(char *path, const struct stat* st,
                                                  bool lazy, TRAPS);
   // 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:
   static int crc32(int crc, const char* buf, int len);
   // Used by the kernel jvm.
   static void update_class_path_entry_list(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_init_selftime()      { return _perf_class_init_selftime; }
   static PerfCounter* perf_classes_verified()         { return _perf_classes_verified; }
   static PerfCounter* perf_class_verify_time()        { return _perf_class_verify_time; }
   static PerfCounter* perf_class_verify_selftime()    { return _perf_class_verify_selftime; }
   static PerfCounter* perf_classes_linked()           { return _perf_classes_linked; }
   static PerfCounter* perf_class_link_time()          { return _perf_class_link_time; }
   static PerfCounter* perf_class_link_selftime()      { return _perf_class_link_selftime; }
   static PerfCounter* perf_class_parse_time()         { return _perf_class_parse_time; }
   static PerfCounter* perf_class_parse_selftime()     { return _perf_class_parse_selftime; }
   static PerfCounter* perf_sys_class_lookup_time()    { return _perf_sys_class_lookup_time; }
   static PerfCounter* perf_shared_classload_time()    { return _perf_shared_classload_time; }
   static PerfCounter* perf_sys_classload_time()       { return _perf_sys_classload_time; }
   static PerfCounter* perf_app_classload_time()       { return _perf_app_classload_time; }
   static PerfCounter* perf_app_classload_selftime()   { return _perf_app_classload_selftime; }
   static PerfCounter* perf_app_classload_count()      { return _perf_app_classload_count; }
   static PerfCounter* perf_define_appclasses()        { return _perf_define_appclasses; }
   static PerfCounter* perf_define_appclass_time()     { return _perf_define_appclass_time; }
   static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
   static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
   static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
   // 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(Symbol* 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<mtClass> *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_class_counter;
   static int _compile_the_world_method_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_class_counter; }
 #endif //PRODUCT
 };
 // PerfClassTraceTime is used to measure time for class loading related events.
 // This class tracks cumulative time and exclusive time for specific event types.
 // During the execution of one event, other event types (e.g. class loading and
 // resolution) as well as recursive calls of the same event type could happen.
 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
 // instances have been created as multiple events are happening.
 class PerfClassTraceTime {
  public:
   enum {
     CLASS_LOAD   = 0,
     PARSE_CLASS  = 1,
     CLASS_LINK   = 2,
     CLASS_VERIFY = 3,
     CLASS_CLINIT = 4,
     DEFINE_CLASS = 5,
     EVENT_TYPE_COUNT = 6
   };
  protected:
   // _t tracks time from initialization to destruction of this timer instance
   // including time for all other event types, and recursive calls of this type.
   // When a timer is called recursively, the elapsedTimer _t would not be used.
   elapsedTimer     _t;
   PerfLongCounter* _timep;
   PerfLongCounter* _selftimep;
   PerfLongCounter* _eventp;
   // pointer to thread-local recursion counter and timer array
   // The thread_local timers track cumulative time for specific event types
   // exclusive of time for other event types, but including recursive calls
   // of the same type.
   int*             _recursion_counters;
   elapsedTimer*    _timers;
   int              _event_type;
   int              _prev_active_event;
  public:
   inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
                             PerfLongCounter* selftimep, /* counter incremented with exclusive time */
                             PerfLongCounter* eventp,    /* event counter */
                             int* recursion_counters,    /* thread-local recursion counter array */
                             elapsedTimer* timers,       /* thread-local timer array */
                             int type                    /* event type */ ) :
       _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
     initialize();
   }
   inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
                             elapsedTimer* timers,       /* thread-local timer array */
                             int type                    /* event type */ ) :
       _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
     initialize();
   }
   inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
   inline void resume()  { _t.start(); _timers[_event_type].start(); }
   ~PerfClassTraceTime();
   void initialize();
 };
 #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/classLoader.hpp@c77d5db18942 (annotated)

src/share/vm/classfile/classLoader.hpp