1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
  26 #define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
  27 
  28 #include "runtime/orderAccess.hpp"
  29 #include "runtime/perfData.hpp"
  30 #include "utilities/exceptions.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 // The VM class loader.
  34 #include <sys/stat.h>
  35 
  36 // Name of boot "modules" image
  37 #define  MODULES_IMAGE_NAME "modules"
  38 
  39 // Name of the resource containing mapping from module names to defining class loader type
  40 #define MODULE_LOADER_MAP "jdk/internal/vm/cds/resources/ModuleLoaderMap.dat"
  41 
  42 // Initial sizes of the following arrays are based on the generated ModuleLoaderMap.dat
  43 #define INITIAL_BOOT_MODULES_ARRAY_SIZE 30
  44 #define INITIAL_PLATFORM_MODULES_ARRAY_SIZE  15
  45 
  46 // Class path entry (directory or zip file)
  47 
  48 class JImageFile;
  49 class ClassFileStream;
  50 
  51 class ClassPathEntry : public CHeapObj<mtClass> {
  52 private:
  53   ClassPathEntry* volatile _next;
  54 public:
  55   // Next entry in class path
  56   ClassPathEntry* next() const {
  57     return (ClassPathEntry*) OrderAccess::load_ptr_acquire(&_next);
  58   }
  59   void set_next(ClassPathEntry* next) {
  60     // may have unlocked readers, so ensure visibility.
  61     OrderAccess::release_store_ptr(&_next, next);
  62   }
  63   virtual bool is_jrt() = 0;
  64   virtual bool is_jar_file() const = 0;
  65   virtual const char* name() const = 0;
  66   virtual JImageFile* jimage() const = 0;
  67   // Constructor
  68   ClassPathEntry() : _next(NULL) {}
  69   // Attempt to locate file_name through this class path entry.
  70   // Returns a class file parsing stream if successfull.
  71   virtual ClassFileStream* open_stream(const char* name, TRAPS) = 0;
  72   // Debugging
  73   NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
  74 };
  75 
  76 class ClassPathDirEntry: public ClassPathEntry {
  77  private:
  78   const char* _dir;           // Name of directory
  79  public:
  80   bool is_jrt()            { return false; }
  81   bool is_jar_file() const { return false;  }
  82   const char* name() const { return _dir; }
  83   JImageFile* jimage() const { return NULL; }
  84   ClassPathDirEntry(const char* dir);
  85   ClassFileStream* open_stream(const char* name, TRAPS);
  86   // Debugging
  87   NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
  88 };
  89 
  90 
  91 // Type definitions for zip file and zip file entry
  92 typedef void* jzfile;
  93 typedef struct {
  94   char *name;                   /* entry name */
  95   jlong time;                   /* modification time */
  96   jlong size;                   /* size of uncompressed data */
  97   jlong csize;                  /* size of compressed data (zero if uncompressed) */
  98   jint crc;                     /* crc of uncompressed data */
  99   char *comment;                /* optional zip file comment */
 100   jbyte *extra;                 /* optional extra data */
 101   jlong pos;                    /* position of LOC header (if negative) or data */
 102 } jzentry;
 103 
 104 
 105 class ClassPathZipEntry: public ClassPathEntry {
 106  enum {
 107    _unknown = 0,
 108    _yes     = 1,
 109    _no      = 2
 110  };
 111  private:
 112   jzfile* _zip;              // The zip archive
 113   const char*   _zip_name;   // Name of zip archive
 114   bool _is_boot_append;      // entry coming from -Xbootclasspath/a
 115   u1 _multi_versioned;       // indicates if the jar file has multi-versioned entries.
 116                              // It can have value of "_unknown", "_yes", or "_no"
 117  public:
 118   bool is_jrt()            { return false; }
 119   bool is_jar_file() const { return true;  }
 120   const char* name() const { return _zip_name; }
 121   JImageFile* jimage() const { return NULL; }
 122   ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append);
 123   ~ClassPathZipEntry();
 124   u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
 125   u1* open_versioned_entry(const char* name, jint* filesize, TRAPS) NOT_CDS_RETURN_(NULL);
 126   ClassFileStream* open_stream(const char* name, TRAPS);
 127   void contents_do(void f(const char* name, void* context), void* context);
 128   bool is_multiple_versioned(TRAPS) NOT_CDS_RETURN_(false);
 129   // Debugging
 130   NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
 131 };
 132 
 133 
 134 // For java image files
 135 class ClassPathImageEntry: public ClassPathEntry {
 136 private:
 137   JImageFile* _jimage;
 138   const char* _name;
 139 public:
 140   bool is_jrt();
 141   bool is_jar_file() const { return false; }
 142   bool is_open() const { return _jimage != NULL; }
 143   const char* name() const { return _name == NULL ? "" : _name; }
 144   JImageFile* jimage() const { return _jimage; }
 145   ClassPathImageEntry(JImageFile* jimage, const char* name);
 146   ~ClassPathImageEntry();
 147   ClassFileStream* open_stream(const char* name, TRAPS);
 148 
 149   // Debugging
 150   NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
 151 };
 152 
 153 // ModuleClassPathList contains a linked list of ClassPathEntry's
 154 // that have been specified for a specific module.  Currently,
 155 // the only way to specify a module/path pair is via the --patch-module
 156 // command line option.
 157 class ModuleClassPathList : public CHeapObj<mtClass> {
 158 private:
 159   Symbol* _module_name;
 160   // First and last entries of class path entries for a specific module
 161   ClassPathEntry* _module_first_entry;
 162   ClassPathEntry* _module_last_entry;
 163 public:
 164   Symbol* module_name() const { return _module_name; }
 165   ClassPathEntry* module_first_entry() const { return _module_first_entry; }
 166   ModuleClassPathList(Symbol* module_name);
 167   ~ModuleClassPathList();
 168   void add_to_list(ClassPathEntry* new_entry);
 169 };
 170 
 171 class SharedPathsMiscInfo;
 172 
 173 class ClassLoader: AllStatic {
 174  public:
 175   enum ClassLoaderType {
 176     BOOT_LOADER = 1,      /* boot loader */
 177     PLATFORM_LOADER  = 2, /* PlatformClassLoader */
 178     APP_LOADER  = 3       /* AppClassLoader */
 179   };
 180  protected:
 181 
 182   // Performance counters
 183   static PerfCounter* _perf_accumulated_time;
 184   static PerfCounter* _perf_classes_inited;
 185   static PerfCounter* _perf_class_init_time;
 186   static PerfCounter* _perf_class_init_selftime;
 187   static PerfCounter* _perf_classes_verified;
 188   static PerfCounter* _perf_class_verify_time;
 189   static PerfCounter* _perf_class_verify_selftime;
 190   static PerfCounter* _perf_classes_linked;
 191   static PerfCounter* _perf_class_link_time;
 192   static PerfCounter* _perf_class_link_selftime;
 193   static PerfCounter* _perf_class_parse_time;
 194   static PerfCounter* _perf_class_parse_selftime;
 195   static PerfCounter* _perf_sys_class_lookup_time;
 196   static PerfCounter* _perf_shared_classload_time;
 197   static PerfCounter* _perf_sys_classload_time;
 198   static PerfCounter* _perf_app_classload_time;
 199   static PerfCounter* _perf_app_classload_selftime;
 200   static PerfCounter* _perf_app_classload_count;
 201   static PerfCounter* _perf_define_appclasses;
 202   static PerfCounter* _perf_define_appclass_time;
 203   static PerfCounter* _perf_define_appclass_selftime;
 204   static PerfCounter* _perf_app_classfile_bytes_read;
 205   static PerfCounter* _perf_sys_classfile_bytes_read;
 206 
 207   static PerfCounter* _sync_systemLoaderLockContentionRate;
 208   static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
 209   static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
 210   static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
 211   static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
 212 
 213   static PerfCounter* _unsafe_defineClassCallCounter;
 214   static PerfCounter* _isUnsyncloadClass;
 215   static PerfCounter* _load_instance_class_failCounter;
 216 
 217   // The boot class path consists of 3 ordered pieces:
 218   //  1. the module/path pairs specified to --patch-module
 219   //    --patch-module=<module>=<file>(<pathsep><file>)*
 220   //  2. the base piece
 221   //    [jimage | build with exploded modules]
 222   //  3. boot loader append path
 223   //    [-Xbootclasspath/a]; [jvmti appended entries]
 224   //
 225   // The boot loader must obey this order when attempting
 226   // to load a class.
 227 
 228   // 1. Contains the module/path pairs specified to --patch-module
 229   static GrowableArray<ModuleClassPathList*>* _patch_mod_entries;
 230 
 231   // 2. the base piece
 232   //    Contains the ClassPathEntry of the modular java runtime image.
 233   //    If no java runtime image is present, this indicates a
 234   //    build with exploded modules is being used instead.
 235   static ClassPathEntry* _jrt_entry;
 236   static GrowableArray<ModuleClassPathList*>* _exploded_entries;
 237   enum { EXPLODED_ENTRY_SIZE = 80 }; // Initial number of exploded modules
 238 
 239   // 3. the boot loader's append path
 240   //    [-Xbootclasspath/a]; [jvmti appended entries]
 241   //    Note: boot loader append path does not support named modules.
 242   static ClassPathEntry* _first_append_entry;
 243   // Last entry in linked list of appended ClassPathEntry instances
 244   static ClassPathEntry* _last_append_entry;
 245 
 246   // Note: _num_entries includes the java runtime image and all
 247   //       the entries on the _first_append_entry linked list.
 248   static int _num_entries;
 249 
 250   // Array of module names associated with the boot class loader
 251   CDS_ONLY(static GrowableArray<char*>* _boot_modules_array;)
 252 
 253   // Array of module names associated with the platform class loader
 254   CDS_ONLY(static GrowableArray<char*>* _platform_modules_array;)
 255 
 256   // Info used by CDS
 257   CDS_ONLY(static SharedPathsMiscInfo * _shared_paths_misc_info;)
 258 
 259   // Initialization:
 260   //   - setup the boot loader's system class path
 261   //   - setup the boot loader's patch mod entries, if present
 262   //   - create the ModuleEntry for java.base
 263   static void setup_bootstrap_search_path();
 264   static void setup_search_path(const char *class_path, bool setting_bootstrap);
 265   static void setup_patch_mod_entries();
 266   static void create_javabase();
 267 
 268   static void load_zip_library();
 269   static void load_jimage_library();
 270   static ClassPathEntry* create_class_path_entry(const char *path, const struct stat* st,
 271                                                  bool throw_exception,
 272                                                  bool is_boot_append, TRAPS);
 273 
 274  public:
 275 
 276   // If the package for the fully qualified class name is in the boot
 277   // loader's package entry table then add_package() sets the classpath_index
 278   // field so that get_system_package() will know to return a non-null value
 279   // for the package's location.  And, so that the package will be added to
 280   // the list of packages returned by get_system_packages().
 281   // For packages whose classes are loaded from the boot loader class path, the
 282   // classpath_index indicates which entry on the boot loader class path.
 283   static bool add_package(const char *fullq_class_name, s2 classpath_index, TRAPS);
 284 
 285   // Canonicalizes path names, so strcmp will work properly. This is mainly
 286   // to avoid confusing the zip library
 287   static bool get_canonical_path(const char* orig, char* out, int len);
 288   static const char* file_name_for_class_name(const char* class_name,
 289                                               int class_name_len);
 290 
 291  public:
 292   static jboolean decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg);
 293   static int crc32(int crc, const char* buf, int len);
 294   static bool update_class_path_entry_list(const char *path,
 295                                            bool check_for_duplicates,
 296                                            bool is_boot_append,
 297                                            bool throw_exception=true);
 298   static void print_bootclasspath();
 299 
 300   // Timing
 301   static PerfCounter* perf_accumulated_time()         { return _perf_accumulated_time; }
 302   static PerfCounter* perf_classes_inited()           { return _perf_classes_inited; }
 303   static PerfCounter* perf_class_init_time()          { return _perf_class_init_time; }
 304   static PerfCounter* perf_class_init_selftime()      { return _perf_class_init_selftime; }
 305   static PerfCounter* perf_classes_verified()         { return _perf_classes_verified; }
 306   static PerfCounter* perf_class_verify_time()        { return _perf_class_verify_time; }
 307   static PerfCounter* perf_class_verify_selftime()    { return _perf_class_verify_selftime; }
 308   static PerfCounter* perf_classes_linked()           { return _perf_classes_linked; }
 309   static PerfCounter* perf_class_link_time()          { return _perf_class_link_time; }
 310   static PerfCounter* perf_class_link_selftime()      { return _perf_class_link_selftime; }
 311   static PerfCounter* perf_class_parse_time()         { return _perf_class_parse_time; }
 312   static PerfCounter* perf_class_parse_selftime()     { return _perf_class_parse_selftime; }
 313   static PerfCounter* perf_sys_class_lookup_time()    { return _perf_sys_class_lookup_time; }
 314   static PerfCounter* perf_shared_classload_time()    { return _perf_shared_classload_time; }
 315   static PerfCounter* perf_sys_classload_time()       { return _perf_sys_classload_time; }
 316   static PerfCounter* perf_app_classload_time()       { return _perf_app_classload_time; }
 317   static PerfCounter* perf_app_classload_selftime()   { return _perf_app_classload_selftime; }
 318   static PerfCounter* perf_app_classload_count()      { return _perf_app_classload_count; }
 319   static PerfCounter* perf_define_appclasses()        { return _perf_define_appclasses; }
 320   static PerfCounter* perf_define_appclass_time()     { return _perf_define_appclass_time; }
 321   static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
 322   static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
 323   static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
 324 
 325   // Record how often system loader lock object is contended
 326   static PerfCounter* sync_systemLoaderLockContentionRate() {
 327     return _sync_systemLoaderLockContentionRate;
 328   }
 329 
 330   // Record how often non system loader lock object is contended
 331   static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
 332     return _sync_nonSystemLoaderLockContentionRate;
 333   }
 334 
 335   // Record how many calls to JVM_FindLoadedClass w/o holding a lock
 336   static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
 337     return _sync_JVMFindLoadedClassLockFreeCounter;
 338   }
 339 
 340   // Record how many calls to JVM_DefineClass w/o holding a lock
 341   static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
 342     return _sync_JVMDefineClassLockFreeCounter;
 343   }
 344 
 345   // Record how many calls to jni_DefineClass w/o holding a lock
 346   static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
 347     return _sync_JNIDefineClassLockFreeCounter;
 348   }
 349 
 350   // Record how many calls to Unsafe_DefineClass
 351   static PerfCounter* unsafe_defineClassCallCounter() {
 352     return _unsafe_defineClassCallCounter;
 353   }
 354 
 355   // Record how many times SystemDictionary::load_instance_class call
 356   // fails with linkageError when Unsyncloadclass flag is set.
 357   static PerfCounter* load_instance_class_failCounter() {
 358     return _load_instance_class_failCounter;
 359   }
 360 
 361   // Modular java runtime image is present vs. a build with exploded modules
 362   static bool has_jrt_entry() { return (_jrt_entry != NULL); }
 363   static ClassPathEntry* get_jrt_entry() { return _jrt_entry; }
 364 
 365   // Add a module's exploded directory to the boot loader's exploded module build list
 366   static void add_to_exploded_build_list(Symbol* module_name, TRAPS);
 367 
 368   // Attempt load of individual class from either the patched or exploded modules build lists
 369   static ClassFileStream* search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
 370                                                 const char* const class_name,
 371                                                 const char* const file_name, TRAPS);
 372 
 373   // Load individual .class file
 374   static instanceKlassHandle load_class(Symbol* class_name, bool search_append_only, TRAPS);
 375 
 376   // If the specified package has been loaded by the system, then returns
 377   // the name of the directory or ZIP file that the package was loaded from.
 378   // Returns null if the package was not loaded.
 379   // Note: The specified name can either be the name of a class or package.
 380   // If a package name is specified, then it must be "/"-separator and also
 381   // end with a trailing "/".
 382   static oop get_system_package(const char* name, TRAPS);
 383 
 384   // Returns an array of Java strings representing all of the currently
 385   // loaded system packages.
 386   // Note: The package names returned are "/"-separated and end with a
 387   // trailing "/".
 388   static objArrayOop get_system_packages(TRAPS);
 389 
 390   // Initialization
 391   static void initialize();
 392   static void classLoader_init2(TRAPS);
 393   CDS_ONLY(static void initialize_shared_path();)
 394 
 395   static int compute_Object_vtable();
 396 
 397   static ClassPathEntry* classpath_entry(int n) {
 398     if (n == 0) {
 399       assert(has_jrt_entry(), "No class path entry at 0 for exploded module builds");
 400       return ClassLoader::_jrt_entry;
 401     } else {
 402       // The java runtime image is always the first entry
 403       // in the FileMapInfo::_classpath_entry_table. Even though
 404       // the _jrt_entry is not included in the _first_append_entry
 405       // linked list, it must be accounted for when comparing the
 406       // class path vs. the shared archive class path.
 407       ClassPathEntry* e = ClassLoader::_first_append_entry;
 408       while (--n >= 1) {
 409         assert(e != NULL, "Not that many classpath entries.");
 410         e = e->next();
 411       }
 412       return e;
 413     }
 414   }
 415 
 416 #if INCLUDE_CDS
 417   // Sharing dump and restore
 418 
 419   static void  check_shared_classpath(const char *path);
 420   static void  finalize_shared_paths_misc_info();
 421   static int   get_shared_paths_misc_info_size();
 422   static void* get_shared_paths_misc_info();
 423   static bool  check_shared_paths_misc_info(void* info, int size);
 424   static void  exit_with_path_failure(const char* error, const char* message);
 425 
 426   static s2 module_to_classloader(const char* module_name);
 427   static void initialize_module_loader_map(JImageFile* jimage);
 428   static s2 classloader_type(Symbol* class_name, ClassPathEntry* e,
 429                              int classpath_index, TRAPS);
 430 #endif
 431 
 432   static void  trace_class_path(const char* msg, const char* name = NULL);
 433 
 434   // VM monitoring and management support
 435   static jlong classloader_time_ms();
 436   static jlong class_method_total_size();
 437   static jlong class_init_count();
 438   static jlong class_init_time_ms();
 439   static jlong class_verify_time_ms();
 440   static jlong class_link_count();
 441   static jlong class_link_time_ms();
 442 
 443   static void set_first_append_entry(ClassPathEntry* entry);
 444 
 445   // indicates if class path already contains a entry (exact match by name)
 446   static bool contains_entry(ClassPathEntry* entry);
 447 
 448   // adds a class path list
 449   static void add_to_list(ClassPathEntry* new_entry);
 450 
 451   // creates a class path zip entry (returns NULL if JAR file cannot be opened)
 452   static ClassPathZipEntry* create_class_path_zip_entry(const char *apath, bool is_boot_append);
 453 
 454   // add a path to class path list
 455   static void add_to_list(const char* apath);
 456 
 457   static bool string_ends_with(const char* str, const char* str_to_find);
 458 
 459   // obtain package name from a fully qualified class name
 460   // *bad_class_name is set to true if there's a problem with parsing class_name, to
 461   // distinguish from a class_name with no package name, as both cases have a NULL return value
 462   static const char* package_from_name(const char* const class_name, bool* bad_class_name = NULL);
 463 
 464   static bool is_jrt(const char* name) { return string_ends_with(name, MODULES_IMAGE_NAME); }
 465 
 466   // Debugging
 467   static void verify()              PRODUCT_RETURN;
 468 
 469   // Force compilation of all methods in all classes in bootstrap class path (stress test)
 470 #ifndef PRODUCT
 471  protected:
 472   static int _compile_the_world_class_counter;
 473   static int _compile_the_world_method_counter;
 474  public:
 475   static void compile_the_world();
 476   static void compile_the_world_in(char* name, Handle loader, TRAPS);
 477   static int  compile_the_world_counter() { return _compile_the_world_class_counter; }
 478 #endif //PRODUCT
 479 };
 480 
 481 // PerfClassTraceTime is used to measure time for class loading related events.
 482 // This class tracks cumulative time and exclusive time for specific event types.
 483 // During the execution of one event, other event types (e.g. class loading and
 484 // resolution) as well as recursive calls of the same event type could happen.
 485 // Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
 486 // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
 487 // instances have been created as multiple events are happening.
 488 class PerfClassTraceTime {
 489  public:
 490   enum {
 491     CLASS_LOAD   = 0,
 492     PARSE_CLASS  = 1,
 493     CLASS_LINK   = 2,
 494     CLASS_VERIFY = 3,
 495     CLASS_CLINIT = 4,
 496     DEFINE_CLASS = 5,
 497     EVENT_TYPE_COUNT = 6
 498   };
 499  protected:
 500   // _t tracks time from initialization to destruction of this timer instance
 501   // including time for all other event types, and recursive calls of this type.
 502   // When a timer is called recursively, the elapsedTimer _t would not be used.
 503   elapsedTimer     _t;
 504   PerfLongCounter* _timep;
 505   PerfLongCounter* _selftimep;
 506   PerfLongCounter* _eventp;
 507   // pointer to thread-local recursion counter and timer array
 508   // The thread_local timers track cumulative time for specific event types
 509   // exclusive of time for other event types, but including recursive calls
 510   // of the same type.
 511   int*             _recursion_counters;
 512   elapsedTimer*    _timers;
 513   int              _event_type;
 514   int              _prev_active_event;
 515 
 516  public:
 517 
 518   inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
 519                             PerfLongCounter* selftimep, /* counter incremented with exclusive time */
 520                             PerfLongCounter* eventp,    /* event counter */
 521                             int* recursion_counters,    /* thread-local recursion counter array */
 522                             elapsedTimer* timers,       /* thread-local timer array */
 523                             int type                    /* event type */ ) :
 524       _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
 525     initialize();
 526   }
 527 
 528   inline PerfClassTraceTime(PerfLongCounter* timep,     /* counter incremented with inclusive time */
 529                             elapsedTimer* timers,       /* thread-local timer array */
 530                             int type                    /* event type */ ) :
 531       _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
 532     initialize();
 533   }
 534 
 535   inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
 536   inline void resume()  { _t.start(); _timers[_event_type].start(); }
 537 
 538   ~PerfClassTraceTime();
 539   void initialize();
 540 };
 541 
 542 #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP