Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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.

  *

  */

 # include "incls/_precompiled.incl"

 # include "incls/_javaClasses.cpp.incl"

 // Helpful routine for computing field offsets at run time rather than hardcoding them

 static void

 compute_offset(int &dest_offset,

                klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol) {

   fieldDescriptor fd;

   instanceKlass* ik = instanceKlass::cast(klass_oop);

   if (!ik->find_local_field(name_symbol, signature_symbol, &fd)) {

     ResourceMark rm;

     tty->print_cr("Invalid layout of %s at %s", ik->external_name(), name_symbol->as_C_string());

     fatal("Invalid layout of preloaded class");

   }

   dest_offset = fd.offset();

 }

 // Same as above but for "optional" offsets that might not be present in certain JDK versions

 static void

 compute_optional_offset(int& dest_offset,

                         klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol) {

   fieldDescriptor fd;

   instanceKlass* ik = instanceKlass::cast(klass_oop);

   if (ik->find_local_field(name_symbol, signature_symbol, &fd)) {

     dest_offset = fd.offset();

   }

 }

 Handle java_lang_String::basic_create(int length, bool tenured, TRAPS) {

   // Create the String object first, so there's a chance that the String

   // and the char array it points to end up in the same cache line.

   oop obj;

   if (tenured) {

     obj = instanceKlass::cast(SystemDictionary::string_klass())->allocate_permanent_instance(CHECK_NH);

   } else {

     obj = instanceKlass::cast(SystemDictionary::string_klass())->allocate_instance(CHECK_NH);

   }

   // Create the char array.  The String object must be handlized here

   // because GC can happen as a result of the allocation attempt.

   Handle h_obj(THREAD, obj);

   typeArrayOop buffer;

   if (tenured) {

     buffer = oopFactory::new_permanent_charArray(length, CHECK_NH);

   } else {

     buffer = oopFactory::new_charArray(length, CHECK_NH);

   }

   // Point the String at the char array

   obj = h_obj();

   set_value(obj, buffer);

   // No need to zero the offset, allocation zero'ed the entire String object

   assert(offset(obj) == 0, "initial String offset should be zero");

 //set_offset(obj, 0);

   set_count(obj, length);

   return h_obj;

 }

 Handle java_lang_String::basic_create_from_unicode(jchar* unicode, int length, bool tenured, TRAPS) {

   Handle h_obj = basic_create(length, tenured, CHECK_NH);

   typeArrayOop buffer = value(h_obj());

   for (int index = 0; index < length; index++) {

     buffer->char_at_put(index, unicode[index]);

   }

   return h_obj;

 }

 Handle java_lang_String::create_from_unicode(jchar* unicode, int length, TRAPS) {

   return basic_create_from_unicode(unicode, length, false, CHECK_NH);

 }

 Handle java_lang_String::create_tenured_from_unicode(jchar* unicode, int length, TRAPS) {

   return basic_create_from_unicode(unicode, length, true, CHECK_NH);

 }

 oop java_lang_String::create_oop_from_unicode(jchar* unicode, int length, TRAPS) {

   Handle h_obj = basic_create_from_unicode(unicode, length, false, CHECK_0);

   return h_obj();

 }

 Handle java_lang_String::create_from_str(const char* utf8_str, TRAPS) {

   if (utf8_str == NULL) {

     return Handle();

   }

   int length = UTF8::unicode_length(utf8_str);

   Handle h_obj = basic_create(length, false, CHECK_NH);

   if (length > 0) {

     UTF8::convert_to_unicode(utf8_str, value(h_obj())->char_at_addr(0), length);

   }

   return h_obj;

 }

 oop java_lang_String::create_oop_from_str(const char* utf8_str, TRAPS) {

   Handle h_obj = create_from_str(utf8_str, CHECK_0);

   return h_obj();

 }

 Handle java_lang_String::create_from_symbol(symbolHandle symbol, TRAPS) {

   int length = UTF8::unicode_length((char*)symbol->bytes(), symbol->utf8_length());

   Handle h_obj = basic_create(length, false, CHECK_NH);

   if (length > 0) {

     UTF8::convert_to_unicode((char*)symbol->bytes(), value(h_obj())->char_at_addr(0), length);

   }

   return h_obj;

 }

 // Converts a C string to a Java String based on current encoding

 Handle java_lang_String::create_from_platform_dependent_str(const char* str, TRAPS) {

   assert(str != NULL, "bad arguments");

   typedef jstring (*to_java_string_fn_t)(JNIEnv*, const char *);

   static to_java_string_fn_t _to_java_string_fn = NULL;

   if (_to_java_string_fn == NULL) {

     void *lib_handle = os::native_java_library();

     _to_java_string_fn = CAST_TO_FN_PTR(to_java_string_fn_t, hpi::dll_lookup(lib_handle, "NewStringPlatform"));

     if (_to_java_string_fn == NULL) {

       fatal("NewStringPlatform missing");

     }

   }

   jstring js = NULL;

   { JavaThread* thread = (JavaThread*)THREAD;

     assert(thread->is_Java_thread(), "must be java thread");

     HandleMark hm(thread);

     ThreadToNativeFromVM ttn(thread);

     js = (_to_java_string_fn)(thread->jni_environment(), str);

   }

   return Handle(THREAD, JNIHandles::resolve(js));

 }

 // Converts a Java String to a native C string that can be used for

 // native OS calls.

 char* java_lang_String::as_platform_dependent_str(Handle java_string, TRAPS) {

   typedef char* (*to_platform_string_fn_t)(JNIEnv*, jstring, bool*);

   static to_platform_string_fn_t _to_platform_string_fn = NULL;

   if (_to_platform_string_fn == NULL) {

     void *lib_handle = os::native_java_library();

     _to_platform_string_fn = CAST_TO_FN_PTR(to_platform_string_fn_t, hpi::dll_lookup(lib_handle, "GetStringPlatformChars"));

     if (_to_platform_string_fn == NULL) {

       fatal("GetStringPlatformChars missing");

     }

   }

   char *native_platform_string;

   { JavaThread* thread = (JavaThread*)THREAD;

     assert(thread->is_Java_thread(), "must be java thread");

     JNIEnv *env = thread->jni_environment();

     jstring js = (jstring) JNIHandles::make_local(env, java_string());

     bool is_copy;

     HandleMark hm(thread);

     ThreadToNativeFromVM ttn(thread);

     native_platform_string = (_to_platform_string_fn)(env, js, &is_copy);

     assert(is_copy == JNI_TRUE, "is_copy value changed");

     JNIHandles::destroy_local(js);

   }

   return native_platform_string;

 }

 Handle java_lang_String::char_converter(Handle java_string, jchar from_char, jchar to_char, TRAPS) {

   oop          obj    = java_string();

   // Typical usage is to convert all '/' to '.' in string.

   typeArrayOop value  = java_lang_String::value(obj);

   int          offset = java_lang_String::offset(obj);

   int          length = java_lang_String::length(obj);

   // First check if any from_char exist

   int index; // Declared outside, used later

   for (index = 0; index < length; index++) {

     if (value->char_at(index + offset) == from_char) {

       break;

     }

   }

   if (index == length) {

     // No from_char, so do not copy.

     return java_string;

   }

   // Create new UNICODE buffer. Must handlize value because GC

   // may happen during String and char array creation.

   typeArrayHandle h_value(THREAD, value);

   Handle string = basic_create(length, false, CHECK_NH);

   typeArrayOop from_buffer = h_value();

   typeArrayOop to_buffer   = java_lang_String::value(string());

   // Copy contents

   for (index = 0; index < length; index++) {

     jchar c = from_buffer->char_at(index + offset);

     if (c == from_char) {

       c = to_char;

     }

     to_buffer->char_at_put(index, c);

   }

   return string;

 }

 jchar* java_lang_String::as_unicode_string(oop java_string, int& length) {

   typeArrayOop value  = java_lang_String::value(java_string);

   int          offset = java_lang_String::offset(java_string);

                length = java_lang_String::length(java_string);

   jchar* result = NEW_RESOURCE_ARRAY(jchar, length);

   for (int index = 0; index < length; index++) {

     result[index] = value->char_at(index + offset);

   }

   return result;

 }

 symbolHandle java_lang_String::as_symbol(Handle java_string, TRAPS) {

   oop          obj    = java_string();

   typeArrayOop value  = java_lang_String::value(obj);

   int          offset = java_lang_String::offset(obj);

   int          length = java_lang_String::length(obj);

   ResourceMark rm(THREAD);

   symbolHandle result;

   if (length > 0) {

     int utf8_length = UNICODE::utf8_length(value->char_at_addr(offset), length);

     char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);

     UNICODE::convert_to_utf8(value->char_at_addr(offset), length, chars);

     // Allocate the symbol

     result = oopFactory::new_symbol_handle(chars, utf8_length, CHECK_(symbolHandle()));

   } else {

     result = oopFactory::new_symbol_handle("", 0, CHECK_(symbolHandle()));

   }

   return result;

 }

 int java_lang_String::utf8_length(oop java_string) {

   typeArrayOop value  = java_lang_String::value(java_string);

   int          offset = java_lang_String::offset(java_string);

   int          length = java_lang_String::length(java_string);

   jchar* position = (length == 0) ? NULL : value->char_at_addr(offset);

   return UNICODE::utf8_length(position, length);

 }

 char* java_lang_String::as_utf8_string(oop java_string) {

   typeArrayOop value  = java_lang_String::value(java_string);

   int          offset = java_lang_String::offset(java_string);

   int          length = java_lang_String::length(java_string);

   jchar* position = (length == 0) ? NULL : value->char_at_addr(offset);

   return UNICODE::as_utf8(position, length);

 }

 char* java_lang_String::as_utf8_string(oop java_string, int start, int len) {

   typeArrayOop value  = java_lang_String::value(java_string);

   int          offset = java_lang_String::offset(java_string);

   int          length = java_lang_String::length(java_string);

   assert(start + len <= length, "just checking");

   jchar* position = value->char_at_addr(offset + start);

   return UNICODE::as_utf8(position, len);

 }

 bool java_lang_String::equals(oop java_string, jchar* chars, int len) {

   assert(SharedSkipVerify ||

          java_string->klass() == SystemDictionary::string_klass(),

          "must be java_string");

   typeArrayOop value  = java_lang_String::value(java_string);

   int          offset = java_lang_String::offset(java_string);

   int          length = java_lang_String::length(java_string);

   if (length != len) {

     return false;

   }

   for (int i = 0; i < len; i++) {

     if (value->char_at(i + offset) != chars[i]) {

       return false;

     }

   }

   return true;

 }

 void java_lang_String::print(Handle java_string, outputStream* st) {

   oop          obj    = java_string();

   assert(obj->klass() == SystemDictionary::string_klass(), "must be java_string");

   typeArrayOop value  = java_lang_String::value(obj);

   int          offset = java_lang_String::offset(obj);

   int          length = java_lang_String::length(obj);

   int end = MIN2(length, 100);

   if (value == NULL) {

     // This can happen if, e.g., printing a String

     // object before its initializer has been called

     st->print_cr("NULL");

   } else {

     st->print("\"");

     for (int index = 0; index < length; index++) {

       st->print("%c", value->char_at(index + offset));

     }

     st->print("\"");

   }

 }

 oop java_lang_Class::create_mirror(KlassHandle k, TRAPS) {

   assert(k->java_mirror() == NULL, "should only assign mirror once");

   // Use this moment of initialization to cache modifier_flags also,

   // to support Class.getModifiers().  Instance classes recalculate

   // the cached flags after the class file is parsed, but before the

   // class is put into the system dictionary.

   int computed_modifiers = k->compute_modifier_flags(CHECK_0);

   k->set_modifier_flags(computed_modifiers);

   if (SystemDictionary::class_klass_loaded()) {

     // Allocate mirror (java.lang.Class instance)

     Handle mirror = instanceKlass::cast(SystemDictionary::class_klass())->allocate_permanent_instance(CHECK_0);

     // Setup indirections

     mirror->obj_field_put(klass_offset,  k());

     k->set_java_mirror(mirror());

     // It might also have a component mirror.  This mirror must already exist.

     if (k->oop_is_javaArray()) {

       Handle comp_mirror;

       if (k->oop_is_typeArray()) {

         BasicType type = typeArrayKlass::cast(k->as_klassOop())->element_type();

         comp_mirror = Universe::java_mirror(type);

         assert(comp_mirror.not_null(), "must have primitive mirror");

       } else if (k->oop_is_objArray()) {

         klassOop element_klass = objArrayKlass::cast(k->as_klassOop())->element_klass();

         if (element_klass != NULL

             && (Klass::cast(element_klass)->oop_is_instance() ||

                 Klass::cast(element_klass)->oop_is_javaArray())) {

           comp_mirror = Klass::cast(element_klass)->java_mirror();

           assert(comp_mirror.not_null(), "must have element mirror");

         }

         // else some object array internal to the VM, like systemObjArrayKlassObj

       }

       if (comp_mirror.not_null()) {

         // Two-way link between the array klass and its component mirror:

         arrayKlass::cast(k->as_klassOop())->set_component_mirror(comp_mirror());

         set_array_klass(comp_mirror(), k->as_klassOop());

       }

     }

     return mirror();

   } else {

     return NULL;

   }

 }

 oop java_lang_Class::create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS) {

   // This should be improved by adding a field at the Java level or by

   // introducing a new VM klass (see comment in ClassFileParser)

   oop java_class = instanceKlass::cast(SystemDictionary::class_klass())->allocate_permanent_instance(CHECK_0);

   if (type != T_VOID) {

     klassOop aklass = Universe::typeArrayKlassObj(type);

     assert(aklass != NULL, "correct bootstrap");

     set_array_klass(java_class, aklass);

   }

   return java_class;

 }

 klassOop java_lang_Class::as_klassOop(oop java_class) {

   //%note memory_2

   klassOop k = klassOop(java_class->obj_field(klass_offset));

   assert(k == NULL || k->is_klass(), "type check");

   return k;

 }

 klassOop java_lang_Class::array_klass(oop java_class) {

   klassOop k = klassOop(java_class->obj_field(array_klass_offset));

   assert(k == NULL || k->is_klass() && Klass::cast(k)->oop_is_javaArray(), "should be array klass");

   return k;

 }

 void java_lang_Class::set_array_klass(oop java_class, klassOop klass) {

   assert(klass->is_klass() && Klass::cast(klass)->oop_is_javaArray(), "should be array klass");

   java_class->obj_field_put(array_klass_offset, klass);

 }

 methodOop java_lang_Class::resolved_constructor(oop java_class) {

   oop constructor = java_class->obj_field(resolved_constructor_offset);

   assert(constructor == NULL || constructor->is_method(), "should be method");

   return methodOop(constructor);

 }

 void java_lang_Class::set_resolved_constructor(oop java_class, methodOop constructor) {

   assert(constructor->is_method(), "should be method");

   java_class->obj_field_put(resolved_constructor_offset, constructor);

 }

 bool java_lang_Class::is_primitive(oop java_class) {

   klassOop k = klassOop(java_class->obj_field(klass_offset));

   return k == NULL;

 }

 BasicType java_lang_Class::primitive_type(oop java_class) {

   assert(java_lang_Class::is_primitive(java_class), "just checking");

   klassOop ak = klassOop(java_class->obj_field(array_klass_offset));

   BasicType type = T_VOID;

   if (ak != NULL) {

     // Note: create_basic_type_mirror above initializes ak to a non-null value.

     type = arrayKlass::cast(ak)->element_type();

   } else {

     assert(java_class == Universe::void_mirror(), "only valid non-array primitive");

   }

   assert(Universe::java_mirror(type) == java_class, "must be consistent");

   return type;

 }

 oop java_lang_Class::primitive_mirror(BasicType t) {

   oop mirror = Universe::java_mirror(t);

   assert(mirror != NULL && mirror->is_a(SystemDictionary::class_klass()), "must be a Class");

   assert(java_lang_Class::is_primitive(mirror), "must be primitive");

   return mirror;

 }

 bool java_lang_Class::offsets_computed = false;

 int  java_lang_Class::classRedefinedCount_offset = -1;

 void java_lang_Class::compute_offsets() {

   assert(!offsets_computed, "offsets should be initialized only once");

   offsets_computed = true;

   klassOop k = SystemDictionary::class_klass();

   // The classRedefinedCount field is only present starting in 1.5,

   // so don't go fatal.

   compute_optional_offset(classRedefinedCount_offset,

     k, vmSymbols::classRedefinedCount_name(), vmSymbols::int_signature());

 }

 int java_lang_Class::classRedefinedCount(oop the_class_mirror) {

   if (!JDK_Version::is_gte_jdk15x_version()

       || classRedefinedCount_offset == -1) {

     // The classRedefinedCount field is only present starting in 1.5.

     // If we don't have an offset for it then just return -1 as a marker.

     return -1;

   }

   return the_class_mirror->int_field(classRedefinedCount_offset);

 }

 void java_lang_Class::set_classRedefinedCount(oop the_class_mirror, int value) {

   if (!JDK_Version::is_gte_jdk15x_version()

       || classRedefinedCount_offset == -1) {

     // The classRedefinedCount field is only present starting in 1.5.

     // If we don't have an offset for it then nothing to set.

     return;

   }

   the_class_mirror->int_field_put(classRedefinedCount_offset, value);

 }

 // Note: JDK1.1 and before had a privateInfo_offset field which was used for the

 //       platform thread structure, and a eetop offset which was used for thread

 //       local storage (and unused by the HotSpot VM). In JDK1.2 the two structures

 //       merged, so in the HotSpot VM we just use the eetop field for the thread

 //       instead of the privateInfo_offset.

 //

 // Note: The stackSize field is only present starting in 1.4.

 int java_lang_Thread::_name_offset = 0;

 int java_lang_Thread::_group_offset = 0;

 int java_lang_Thread::_contextClassLoader_offset = 0;

 int java_lang_Thread::_inheritedAccessControlContext_offset = 0;

 int java_lang_Thread::_priority_offset = 0;

 int java_lang_Thread::_eetop_offset = 0;

 int java_lang_Thread::_daemon_offset = 0;

 int java_lang_Thread::_stillborn_offset = 0;

 int java_lang_Thread::_stackSize_offset = 0;

 int java_lang_Thread::_tid_offset = 0;

 int java_lang_Thread::_thread_status_offset = 0;

 int java_lang_Thread::_park_blocker_offset = 0;

 int java_lang_Thread::_park_event_offset = 0 ;

 void java_lang_Thread::compute_offsets() {

   assert(_group_offset == 0, "offsets should be initialized only once");

   klassOop k = SystemDictionary::thread_klass();

   compute_offset(_name_offset,      k, vmSymbols::name_name(),      vmSymbols::char_array_signature());

   compute_offset(_group_offset,     k, vmSymbols::group_name(),     vmSymbols::threadgroup_signature());

   compute_offset(_contextClassLoader_offset, k, vmSymbols::contextClassLoader_name(), vmSymbols::classloader_signature());

   compute_offset(_inheritedAccessControlContext_offset, k, vmSymbols::inheritedAccessControlContext_name(), vmSymbols::accesscontrolcontext_signature());

   compute_offset(_priority_offset,  k, vmSymbols::priority_name(),  vmSymbols::int_signature());

   compute_offset(_daemon_offset,    k, vmSymbols::daemon_name(),    vmSymbols::bool_signature());

   compute_offset(_eetop_offset,     k, vmSymbols::eetop_name(),     vmSymbols::long_signature());

   compute_offset(_stillborn_offset, k, vmSymbols::stillborn_name(), vmSymbols::bool_signature());

   // The stackSize field is only present starting in 1.4, so don't go fatal.

   compute_optional_offset(_stackSize_offset, k, vmSymbols::stackSize_name(), vmSymbols::long_signature());

   // The tid and thread_status fields are only present starting in 1.5, so don't go fatal.

   compute_optional_offset(_tid_offset, k, vmSymbols::thread_id_name(), vmSymbols::long_signature());

   compute_optional_offset(_thread_status_offset, k, vmSymbols::thread_status_name(), vmSymbols::int_signature());

   // The parkBlocker field is only present starting in 1.6, so don't go fatal.

   compute_optional_offset(_park_blocker_offset, k, vmSymbols::park_blocker_name(), vmSymbols::object_signature());

   compute_optional_offset(_park_event_offset, k, vmSymbols::park_event_name(),

  vmSymbols::long_signature());

 }

 JavaThread* java_lang_Thread::thread(oop java_thread) {

   return (JavaThread*)java_thread->address_field(_eetop_offset);

 }

 void java_lang_Thread::set_thread(oop java_thread, JavaThread* thread) {

   java_thread->address_field_put(_eetop_offset, (address)thread);

 }

 typeArrayOop java_lang_Thread::name(oop java_thread) {

   oop name = java_thread->obj_field(_name_offset);

   assert(name == NULL || (name->is_typeArray() && typeArrayKlass::cast(name->klass())->element_type() == T_CHAR), "just checking");

   return typeArrayOop(name);

 }

 void java_lang_Thread::set_name(oop java_thread, typeArrayOop name) {

   assert(java_thread->obj_field(_name_offset) == NULL, "name should be NULL");

   java_thread->obj_field_put(_name_offset, name);

 }

 ThreadPriority java_lang_Thread::priority(oop java_thread) {

   return (ThreadPriority)java_thread->int_field(_priority_offset);

 }

 void java_lang_Thread::set_priority(oop java_thread, ThreadPriority priority) {

   java_thread->int_field_put(_priority_offset, priority);

 }

 oop java_lang_Thread::threadGroup(oop java_thread) {

   return java_thread->obj_field(_group_offset);

 }

 bool java_lang_Thread::is_stillborn(oop java_thread) {

   return java_thread->bool_field(_stillborn_offset) != 0;

 }

 // We never have reason to turn the stillborn bit off

 void java_lang_Thread::set_stillborn(oop java_thread) {

   java_thread->bool_field_put(_stillborn_offset, true);

 }

 bool java_lang_Thread::is_alive(oop java_thread) {

   JavaThread* thr = java_lang_Thread::thread(java_thread);

   return (thr != NULL);

 }

 bool java_lang_Thread::is_daemon(oop java_thread) {

   return java_thread->bool_field(_daemon_offset) != 0;

 }

 void java_lang_Thread::set_daemon(oop java_thread) {

   java_thread->bool_field_put(_daemon_offset, true);

 }

 oop java_lang_Thread::context_class_loader(oop java_thread) {

   return java_thread->obj_field(_contextClassLoader_offset);

 }

 oop java_lang_Thread::inherited_access_control_context(oop java_thread) {

   return java_thread->obj_field(_inheritedAccessControlContext_offset);

 }

 jlong java_lang_Thread::stackSize(oop java_thread) {

   // The stackSize field is only present starting in 1.4

   if (_stackSize_offset > 0) {

     assert(JDK_Version::is_gte_jdk14x_version(), "sanity check");

     return java_thread->long_field(_stackSize_offset);

   } else {

     return 0;

   }

 }

 // Write the thread status value to threadStatus field in java.lang.Thread java class.

 void java_lang_Thread::set_thread_status(oop java_thread,

                                          java_lang_Thread::ThreadStatus status) {

   assert(JavaThread::current()->thread_state() == _thread_in_vm, "Java Thread is not running in vm");

   // The threadStatus is only present starting in 1.5

   if (_thread_status_offset > 0) {

     java_thread->int_field_put(_thread_status_offset, status);

   }

 }

 // Read thread status value from threadStatus field in java.lang.Thread java class.

 java_lang_Thread::ThreadStatus java_lang_Thread::get_thread_status(oop java_thread) {

   assert(Thread::current()->is_VM_thread() ||

          JavaThread::current()->thread_state() == _thread_in_vm,

          "Java Thread is not running in vm");

   // The threadStatus is only present starting in 1.5

   if (_thread_status_offset > 0) {

     return (java_lang_Thread::ThreadStatus)java_thread->int_field(_thread_status_offset);

   } else {

     // All we can easily figure out is if it is alive, but that is

     // enough info for a valid unknown status.

     // These aren't restricted to valid set ThreadStatus values, so

     // use JVMTI values and cast.

     JavaThread* thr = java_lang_Thread::thread(java_thread);

     if (thr == NULL) {

       // the thread hasn't run yet or is in the process of exiting

       return NEW;

     }

     return (java_lang_Thread::ThreadStatus)JVMTI_THREAD_STATE_ALIVE;

   }

 }

 jlong java_lang_Thread::thread_id(oop java_thread) {

   // The thread ID field is only present starting in 1.5

   if (_tid_offset > 0) {

     return java_thread->long_field(_tid_offset);

   } else {

     return 0;

   }

 }

 oop java_lang_Thread::park_blocker(oop java_thread) {

   assert(JDK_Version::supports_thread_park_blocker() && _park_blocker_offset != 0,

          "Must support parkBlocker field");

   if (_park_blocker_offset > 0) {

     return java_thread->obj_field(_park_blocker_offset);

   }

   return NULL;

 }

 jlong java_lang_Thread::park_event(oop java_thread) {

   if (_park_event_offset > 0) {

     return java_thread->long_field(_park_event_offset);

   }

   return 0;

 }

 bool java_lang_Thread::set_park_event(oop java_thread, jlong ptr) {

   if (_park_event_offset > 0) {

     java_thread->long_field_put(_park_event_offset, ptr);

     return true;

   }

   return false;

 }

 const char* java_lang_Thread::thread_status_name(oop java_thread) {

   assert(JDK_Version::is_gte_jdk15x_version() && _thread_status_offset != 0, "Must have thread status");

   ThreadStatus status = (java_lang_Thread::ThreadStatus)java_thread->int_field(_thread_status_offset);

   switch (status) {

     case NEW                      : return "NEW";

     case RUNNABLE                 : return "RUNNABLE";

     case SLEEPING                 : return "TIMED_WAITING (sleeping)";

     case IN_OBJECT_WAIT           : return "WAITING (on object monitor)";

     case IN_OBJECT_WAIT_TIMED     : return "TIMED_WAITING (on object monitor)";

     case PARKED                   : return "WAITING (parking)";

     case PARKED_TIMED             : return "TIMED_WAITING (parking)";

     case BLOCKED_ON_MONITOR_ENTER : return "BLOCKED (on object monitor)";

     case TERMINATED               : return "TERMINATED";

     default                       : return "UNKNOWN";

   };

 }

 int java_lang_ThreadGroup::_parent_offset = 0;

 int java_lang_ThreadGroup::_name_offset = 0;

 int java_lang_ThreadGroup::_threads_offset = 0;

 int java_lang_ThreadGroup::_groups_offset = 0;

 int java_lang_ThreadGroup::_maxPriority_offset = 0;

 int java_lang_ThreadGroup::_destroyed_offset = 0;

 int java_lang_ThreadGroup::_daemon_offset = 0;

 int java_lang_ThreadGroup::_vmAllowSuspension_offset = 0;

 int java_lang_ThreadGroup::_nthreads_offset = 0;

 int java_lang_ThreadGroup::_ngroups_offset = 0;

 oop  java_lang_ThreadGroup::parent(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->obj_field(_parent_offset);

 }

 // ("name as oop" accessor is not necessary)

 typeArrayOop java_lang_ThreadGroup::name(oop java_thread_group) {

   oop name = java_thread_group->obj_field(_name_offset);

   // ThreadGroup.name can be null

   return name == NULL ? (typeArrayOop)NULL : java_lang_String::value(name);

 }

 int java_lang_ThreadGroup::nthreads(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->int_field(_nthreads_offset);

 }

 objArrayOop java_lang_ThreadGroup::threads(oop java_thread_group) {

   oop threads = java_thread_group->obj_field(_threads_offset);

   assert(threads != NULL, "threadgroups should have threads");

   assert(threads->is_objArray(), "just checking"); // Todo: Add better type checking code

   return objArrayOop(threads);

 }

 int java_lang_ThreadGroup::ngroups(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->int_field(_ngroups_offset);

 }

 objArrayOop java_lang_ThreadGroup::groups(oop java_thread_group) {

   oop groups = java_thread_group->obj_field(_groups_offset);

   assert(groups == NULL || groups->is_objArray(), "just checking"); // Todo: Add better type checking code

   return objArrayOop(groups);

 }

 ThreadPriority java_lang_ThreadGroup::maxPriority(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return (ThreadPriority) java_thread_group->int_field(_maxPriority_offset);

 }

 bool java_lang_ThreadGroup::is_destroyed(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->bool_field(_destroyed_offset) != 0;

 }

 bool java_lang_ThreadGroup::is_daemon(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->bool_field(_daemon_offset) != 0;

 }

 bool java_lang_ThreadGroup::is_vmAllowSuspension(oop java_thread_group) {

   assert(java_thread_group->is_oop(), "thread group must be oop");

   return java_thread_group->bool_field(_vmAllowSuspension_offset) != 0;

 }

 void java_lang_ThreadGroup::compute_offsets() {

   assert(_parent_offset == 0, "offsets should be initialized only once");

   klassOop k = SystemDictionary::threadGroup_klass();

   compute_offset(_parent_offset,      k, vmSymbols::parent_name(),      vmSymbols::threadgroup_signature());

   compute_offset(_name_offset,        k, vmSymbols::name_name(),        vmSymbols::string_signature());

   compute_offset(_threads_offset,     k, vmSymbols::threads_name(),     vmSymbols::thread_array_signature());

   compute_offset(_groups_offset,      k, vmSymbols::groups_name(),      vmSymbols::threadgroup_array_signature());

   compute_offset(_maxPriority_offset, k, vmSymbols::maxPriority_name(), vmSymbols::int_signature());

   compute_offset(_destroyed_offset,   k, vmSymbols::destroyed_name(),   vmSymbols::bool_signature());

   compute_offset(_daemon_offset,      k, vmSymbols::daemon_name(),      vmSymbols::bool_signature());

   compute_offset(_vmAllowSuspension_offset, k, vmSymbols::vmAllowSuspension_name(), vmSymbols::bool_signature());

   compute_offset(_nthreads_offset,    k, vmSymbols::nthreads_name(),    vmSymbols::int_signature());

   compute_offset(_ngroups_offset,     k, vmSymbols::ngroups_name(),     vmSymbols::int_signature());

 }

 oop java_lang_Throwable::backtrace(oop throwable) {

   return throwable->obj_field_acquire(backtrace_offset);

 }

 void java_lang_Throwable::set_backtrace(oop throwable, oop value) {

   throwable->release_obj_field_put(backtrace_offset, value);

 }

 oop java_lang_Throwable::message(oop throwable) {

   return throwable->obj_field(detailMessage_offset);

 }

 oop java_lang_Throwable::message(Handle throwable) {

   return throwable->obj_field(detailMessage_offset);

 }

 void java_lang_Throwable::set_message(oop throwable, oop value) {

   throwable->obj_field_put(detailMessage_offset, value);

 }

 void java_lang_Throwable::clear_stacktrace(oop throwable) {

   assert(JDK_Version::is_gte_jdk14x_version(), "should only be called in >= 1.4");

   throwable->obj_field_put(stackTrace_offset, NULL);

 }

 void java_lang_Throwable::print(oop throwable, outputStream* st) {

   ResourceMark rm;

   klassOop k = throwable->klass();

   assert(k != NULL, "just checking");

   st->print("%s", instanceKlass::cast(k)->external_name());

   oop msg = message(throwable);

   if (msg != NULL) {

     st->print(": %s", java_lang_String::as_utf8_string(msg));

   }

 }

 void java_lang_Throwable::print(Handle throwable, outputStream* st) {

   ResourceMark rm;

   klassOop k = throwable->klass();

   assert(k != NULL, "just checking");

   st->print("%s", instanceKlass::cast(k)->external_name());

   oop msg = message(throwable);

   if (msg != NULL) {

     st->print(": %s", java_lang_String::as_utf8_string(msg));

   }

 }

 // Print stack trace element to resource allocated buffer

 char* java_lang_Throwable::print_stack_element_to_buffer(methodOop method, int bci) {

   // Get strings and string lengths

   instanceKlass* klass = instanceKlass::cast(method->method_holder());

   const char* klass_name  = klass->external_name();

   int buf_len = (int)strlen(klass_name);

   char* source_file_name;

   if (klass->source_file_name() == NULL) {

     source_file_name = NULL;

   } else {

     source_file_name = klass->source_file_name()->as_C_string();

     buf_len += (int)strlen(source_file_name);

   }

   char* method_name = method->name()->as_C_string();

   buf_len += (int)strlen(method_name);

   // Allocate temporary buffer with extra space for formatting and line number

   char* buf = NEW_RESOURCE_ARRAY(char, buf_len + 64);

   // Print stack trace line in buffer

   sprintf(buf, "\tat %s.%s", klass_name, method_name);

   if (method->is_native()) {

     strcat(buf, "(Native Method)");

   } else {

     int line_number = method->line_number_from_bci(bci);

     if (source_file_name != NULL && (line_number != -1)) {

       // Sourcename and linenumber

       sprintf(buf + (int)strlen(buf), "(%s:%d)", source_file_name, line_number);

     } else if (source_file_name != NULL) {

       // Just sourcename

       sprintf(buf + (int)strlen(buf), "(%s)", source_file_name);

     } else {

       // Neither soucename and linenumber

       sprintf(buf + (int)strlen(buf), "(Unknown Source)");

     }

     nmethod* nm = method->code();

     if (WizardMode && nm != NULL) {

       sprintf(buf + (int)strlen(buf), "(nmethod %#x)", nm);

     }

   }

   return buf;

 }

 void java_lang_Throwable::print_stack_element(Handle stream, methodOop method, int bci) {

   ResourceMark rm;

   char* buf = print_stack_element_to_buffer(method, bci);

   print_to_stream(stream, buf);

 }

 void java_lang_Throwable::print_stack_element(outputStream *st, methodOop method, int bci) {

   ResourceMark rm;

   char* buf = print_stack_element_to_buffer(method, bci);

   st->print_cr("%s", buf);

 }

 void java_lang_Throwable::print_to_stream(Handle stream, const char* str) {

   if (stream.is_null()) {

     tty->print_cr("%s", str);

   } else {

     EXCEPTION_MARK;

     JavaValue result(T_VOID);

     Handle arg (THREAD, oopFactory::new_charArray(str, THREAD));

     if (!HAS_PENDING_EXCEPTION) {

       JavaCalls::call_virtual(&result,

                               stream,

                               KlassHandle(THREAD, stream->klass()),

                               vmSymbolHandles::println_name(),

                               vmSymbolHandles::char_array_void_signature(),

                               arg,

                               THREAD);

     }

     // Ignore any exceptions. we are in the middle of exception handling. Same as classic VM.

     if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;

   }

 }

 const char* java_lang_Throwable::no_stack_trace_message() {

   return "\t<<no stack trace available>>";

 }

 // Currently used only for exceptions occurring during startup

 void java_lang_Throwable::print_stack_trace(oop throwable, outputStream* st) {

   Thread *THREAD = Thread::current();

   Handle h_throwable(THREAD, throwable);

   while (h_throwable.not_null()) {

     objArrayHandle result (THREAD, objArrayOop(backtrace(h_throwable())));

     if (result.is_null()) {

       st->print_cr(no_stack_trace_message());

       return;

     }

     while (result.not_null()) {

       objArrayHandle methods (THREAD,

                               objArrayOop(result->obj_at(trace_methods_offset)));

       typeArrayHandle bcis (THREAD,

                             typeArrayOop(result->obj_at(trace_bcis_offset)));

       if (methods.is_null() || bcis.is_null()) {

         st->print_cr(no_stack_trace_message());

         return;

       }

       int length = methods()->length();

       for (int index = 0; index < length; index++) {

         methodOop method = methodOop(methods()->obj_at(index));

         if (method == NULL) goto handle_cause;

         int bci = bcis->ushort_at(index);

         print_stack_element(st, method, bci);

       }

       result = objArrayHandle(THREAD, objArrayOop(result->obj_at(trace_next_offset)));

     }

   handle_cause:

     {

       EXCEPTION_MARK;

       JavaValue result(T_OBJECT);

       JavaCalls::call_virtual(&result,

                               h_throwable,

                               KlassHandle(THREAD, h_throwable->klass()),

                               vmSymbolHandles::getCause_name(),

                               vmSymbolHandles::void_throwable_signature(),

                               THREAD);

       // Ignore any exceptions. we are in the middle of exception handling. Same as classic VM.

       if (HAS_PENDING_EXCEPTION) {

         CLEAR_PENDING_EXCEPTION;

         h_throwable = Handle();

       } else {

         h_throwable = Handle(THREAD, (oop) result.get_jobject());

         if (h_throwable.not_null()) {

           st->print("Caused by: ");

           print(h_throwable, st);

           st->cr();

         }

       }

     }

   }

 }

 void java_lang_Throwable::print_stack_trace(oop throwable, oop print_stream) {

   // Note: this is no longer used in Merlin, but we support it for compatibility.

   Thread *thread = Thread::current();

   Handle stream(thread, print_stream);

   objArrayHandle result (thread, objArrayOop(backtrace(throwable)));

   if (result.is_null()) {

     print_to_stream(stream, no_stack_trace_message());

     return;

   }

   while (result.not_null()) {

     objArrayHandle methods (thread,

                             objArrayOop(result->obj_at(trace_methods_offset)));

     typeArrayHandle bcis (thread,

                           typeArrayOop(result->obj_at(trace_bcis_offset)));

     if (methods.is_null() || bcis.is_null()) {

       print_to_stream(stream, no_stack_trace_message());

       return;

     }

     int length = methods()->length();

     for (int index = 0; index < length; index++) {

       methodOop method = methodOop(methods()->obj_at(index));

       if (method == NULL) return;

       int bci = bcis->ushort_at(index);

       print_stack_element(stream, method, bci);

     }

     result = objArrayHandle(thread, objArrayOop(result->obj_at(trace_next_offset)));

   }

 }

 // This class provides a simple wrapper over the internal structure of

 // exception backtrace to insulate users of the backtrace from needing

 // to know what it looks like.

 class BacktraceBuilder: public StackObj {

  private:

   Handle          _backtrace;

   objArrayOop     _head;

   objArrayOop     _methods;

   typeArrayOop    _bcis;

   int             _index;

   bool            _dirty;

   No_Safepoint_Verifier _nsv;

  public:

   enum {

     trace_methods_offset = java_lang_Throwable::trace_methods_offset,

     trace_bcis_offset    = java_lang_Throwable::trace_bcis_offset,

     trace_next_offset    = java_lang_Throwable::trace_next_offset,

     trace_size           = java_lang_Throwable::trace_size,

     trace_chunk_size     = java_lang_Throwable::trace_chunk_size

   };

   // constructor for new backtrace

   BacktraceBuilder(TRAPS): _methods(NULL), _bcis(NULL), _head(NULL), _dirty(false) {

     expand(CHECK);

     _backtrace = _head;

     _index = 0;

   }

   void flush() {

     if (_dirty && _methods != NULL) {

       BarrierSet* bs = Universe::heap()->barrier_set();

       assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");

       bs->write_ref_array(MemRegion((HeapWord*)_methods->base(),

                                     _methods->array_size()));

       _dirty = false;

     }

   }

   void expand(TRAPS) {

     flush();

     objArrayHandle old_head(THREAD, _head);

     Pause_No_Safepoint_Verifier pnsv(&_nsv);

     objArrayOop head = oopFactory::new_objectArray(trace_size, CHECK);

     objArrayHandle new_head(THREAD, head);

     objArrayOop methods = oopFactory::new_objectArray(trace_chunk_size, CHECK);

     objArrayHandle new_methods(THREAD, methods);

     typeArrayOop bcis = oopFactory::new_shortArray(trace_chunk_size, CHECK);

     typeArrayHandle new_bcis(THREAD, bcis);

     if (!old_head.is_null()) {

       old_head->obj_at_put(trace_next_offset, new_head());

     }

     new_head->obj_at_put(trace_methods_offset, new_methods());

     new_head->obj_at_put(trace_bcis_offset, new_bcis());

     _head    = new_head();

     _methods = new_methods();

     _bcis    = new_bcis();

     _index = 0;

   }

   oop backtrace() {

     flush();

     return _backtrace();

   }

   inline void push(methodOop method, short bci, TRAPS) {

     if (_index >= trace_chunk_size) {

       methodHandle mhandle(THREAD, method);

       expand(CHECK);

       method = mhandle();

     }

      _methods->obj_at_put(_index, method);

     // bad for UseCompressedOops

     // *_methods->obj_at_addr(_index) = method;

     _bcis->ushort_at_put(_index, bci);

     _index++;

     _dirty = true;

   }

   methodOop current_method() {

     assert(_index >= 0 && _index < trace_chunk_size, "out of range");

     return methodOop(_methods->obj_at(_index));

   }

   jushort current_bci() {

     assert(_index >= 0 && _index < trace_chunk_size, "out of range");

     return _bcis->ushort_at(_index);

   }

 };

 void java_lang_Throwable::fill_in_stack_trace(Handle throwable, TRAPS) {

   if (!StackTraceInThrowable) return;

   ResourceMark rm(THREAD);

   // Start out by clearing the backtrace for this object, in case the VM

   // runs out of memory while allocating the stack trace

   set_backtrace(throwable(), NULL);

   if (JDK_Version::is_gte_jdk14x_version()) {

     // New since 1.4, clear lazily constructed Java level stacktrace if

     // refilling occurs

     clear_stacktrace(throwable());

   }

   int max_depth = MaxJavaStackTraceDepth;

   JavaThread* thread = (JavaThread*)THREAD;

   BacktraceBuilder bt(CHECK);

   // Instead of using vframe directly, this version of fill_in_stack_trace

   // basically handles everything by hand. This significantly improved the

   // speed of this method call up to 28.5% on Solaris sparc. 27.1% on Windows.

   // See bug 6333838 for  more details.

   // The "ASSERT" here is to verify this method generates the exactly same stack

   // trace as utilizing vframe.

 #ifdef ASSERT

   vframeStream st(thread);

   methodHandle st_method(THREAD, st.method());

 #endif

   int total_count = 0;

   RegisterMap map(thread, false);

   int decode_offset = 0;

   nmethod* nm = NULL;

   bool skip_fillInStackTrace_check = false;

   bool skip_throwableInit_check = false;

   for (frame fr = thread->last_frame(); max_depth != total_count;) {

     methodOop method = NULL;

     int bci = 0;

     // Compiled java method case.

     if (decode_offset != 0) {

       DebugInfoReadStream stream(nm, decode_offset);

       decode_offset = stream.read_int();

       method = (methodOop)nm->oop_at(stream.read_int());

       bci = stream.read_bci();

     } else {

       if (fr.is_first_frame()) break;

       address pc = fr.pc();

       if (fr.is_interpreted_frame()) {

         intptr_t bcx = fr.interpreter_frame_bcx();

         method = fr.interpreter_frame_method();

         bci =  fr.is_bci(bcx) ? bcx : method->bci_from((address)bcx);

         fr = fr.sender(&map);

       } else {

         CodeBlob* cb = fr.cb();

         // HMMM QQQ might be nice to have frame return nm as NULL if cb is non-NULL

         // but non nmethod

         fr = fr.sender(&map);

         if (cb == NULL || !cb->is_nmethod()) {

           continue;

         }

         nm = (nmethod*)cb;

         if (nm->method()->is_native()) {

           method = nm->method();

           bci = 0;

         } else {

           PcDesc* pd = nm->pc_desc_at(pc);

           decode_offset = pd->scope_decode_offset();

           // if decode_offset is not equal to 0, it will execute the

           // "compiled java method case" at the beginning of the loop.

           continue;

         }

       }

     }

 #ifdef ASSERT

   assert(st_method() == method && st.bci() == bci,

          "Wrong stack trace");

   st.next();

   // vframeStream::method isn't GC-safe so store off a copy

   // of the methodOop in case we GC.

   if (!st.at_end()) {

     st_method = st.method();

   }

 #endif

     if (!skip_fillInStackTrace_check) {

       // check "fillInStackTrace" only once, so we negate the flag

       // after the first time check.

       skip_fillInStackTrace_check = true;

       if (method->name() == vmSymbols::fillInStackTrace_name()) {

         continue;

       }

     }

     // skip <init> methods of the exceptions klass. If there is <init> methods

     // that belongs to a superclass of the exception  we are going to skipping

     // them in stack trace. This is simlar to classic VM.

     if (!skip_throwableInit_check) {

       if (method->name() == vmSymbols::object_initializer_name() &&

           throwable->is_a(method->method_holder())) {

         continue;

       } else {

         // if no "Throwable.init()" method found, we stop checking it next time.

         skip_throwableInit_check = true;

       }

     }

     bt.push(method, bci, CHECK);

     total_count++;

   }

   // Put completed stack trace into throwable object

   set_backtrace(throwable(), bt.backtrace());

 }

 void java_lang_Throwable::fill_in_stack_trace(Handle throwable) {

   // No-op if stack trace is disabled

   if (!StackTraceInThrowable) {

     return;

   }

   // Disable stack traces for some preallocated out of memory errors

   if (!Universe::should_fill_in_stack_trace(throwable)) {

     return;

   }

   PRESERVE_EXCEPTION_MARK;

   JavaThread* thread = JavaThread::active();

   fill_in_stack_trace(throwable, thread);

   // ignore exceptions thrown during stack trace filling

   CLEAR_PENDING_EXCEPTION;

 }

 void java_lang_Throwable::allocate_backtrace(Handle throwable, TRAPS) {

   // Allocate stack trace - backtrace is created but not filled in

   // No-op if stack trace is disabled

   if (!StackTraceInThrowable) return;

   objArrayOop h_oop = oopFactory::new_objectArray(trace_size, CHECK);

   objArrayHandle backtrace  (THREAD, h_oop);

   objArrayOop m_oop = oopFactory::new_objectArray(trace_chunk_size, CHECK);

   objArrayHandle methods (THREAD, m_oop);

   typeArrayOop b = oopFactory::new_shortArray(trace_chunk_size, CHECK);

   typeArrayHandle bcis(THREAD, b);

   // backtrace has space for one chunk (next is NULL)

   backtrace->obj_at_put(trace_methods_offset, methods());

   backtrace->obj_at_put(trace_bcis_offset, bcis());

   set_backtrace(throwable(), backtrace());

 }

 void java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(Handle throwable) {

   // Fill in stack trace into preallocated backtrace (no GC)

   // No-op if stack trace is disabled

   if (!StackTraceInThrowable) return;

   assert(throwable->is_a(SystemDictionary::throwable_klass()), "sanity check");

   oop backtrace = java_lang_Throwable::backtrace(throwable());

   assert(backtrace != NULL, "backtrace not preallocated");

   oop m = objArrayOop(backtrace)->obj_at(trace_methods_offset);

   objArrayOop methods = objArrayOop(m);

   assert(methods != NULL && methods->length() > 0, "method array not preallocated");

   oop b = objArrayOop(backtrace)->obj_at(trace_bcis_offset);

   typeArrayOop bcis = typeArrayOop(b);

   assert(bcis != NULL, "bci array not preallocated");

   assert(methods->length() == bcis->length(), "method and bci arrays should match");

   JavaThread* thread = JavaThread::current();

   ResourceMark rm(thread);

   vframeStream st(thread);

   // Unlike fill_in_stack_trace we do not skip fillInStackTrace or throwable init

   // methods as preallocated errors aren't created by "java" code.

   // fill in as much stack trace as possible

   int max_chunks = MIN2(methods->length(), (int)MaxJavaStackTraceDepth);

   int chunk_count = 0;

   for (;!st.at_end(); st.next()) {

     // add element

     bcis->ushort_at_put(chunk_count, st.bci());

     methods->obj_at_put(chunk_count, st.method());

     chunk_count++;

     // Bail-out for deep stacks

     if (chunk_count >= max_chunks) break;

   }

 }

 int java_lang_Throwable::get_stack_trace_depth(oop throwable, TRAPS) {

   if (throwable == NULL) {

     THROW_0(vmSymbols::java_lang_NullPointerException());

   }

   objArrayOop chunk = objArrayOop(backtrace(throwable));

   int depth = 0;

   if (chunk != NULL) {

     // Iterate over chunks and count full ones

     while (true) {

       objArrayOop next = objArrayOop(chunk->obj_at(trace_next_offset));

       if (next == NULL) break;

       depth += trace_chunk_size;

       chunk = next;

     }

     assert(chunk != NULL && chunk->obj_at(trace_next_offset) == NULL, "sanity check");

     // Count element in remaining partial chunk

     objArrayOop methods = objArrayOop(chunk->obj_at(trace_methods_offset));

     typeArrayOop bcis = typeArrayOop(chunk->obj_at(trace_bcis_offset));

     assert(methods != NULL && bcis != NULL, "sanity check");

     for (int i = 0; i < methods->length(); i++) {

       if (methods->obj_at(i) == NULL) break;

       depth++;

     }

   }

   return depth;

 }

 oop java_lang_Throwable::get_stack_trace_element(oop throwable, int index, TRAPS) {

   if (throwable == NULL) {

     THROW_0(vmSymbols::java_lang_NullPointerException());

   }

   if (index < 0) {

     THROW_(vmSymbols::java_lang_IndexOutOfBoundsException(), NULL);

   }

   // Compute how many chunks to skip and index into actual chunk

   objArrayOop chunk = objArrayOop(backtrace(throwable));

   int skip_chunks = index / trace_chunk_size;

   int chunk_index = index % trace_chunk_size;

   while (chunk != NULL && skip_chunks > 0) {

     chunk = objArrayOop(chunk->obj_at(trace_next_offset));

         skip_chunks--;

   }

   if (chunk == NULL) {

     THROW_(vmSymbols::java_lang_IndexOutOfBoundsException(), NULL);

   }

   // Get method,bci from chunk

   objArrayOop methods = objArrayOop(chunk->obj_at(trace_methods_offset));

   typeArrayOop bcis = typeArrayOop(chunk->obj_at(trace_bcis_offset));

   assert(methods != NULL && bcis != NULL, "sanity check");

   methodHandle method(THREAD, methodOop(methods->obj_at(chunk_index)));

   int bci = bcis->ushort_at(chunk_index);

   // Chunk can be partial full

   if (method.is_null()) {

     THROW_(vmSymbols::java_lang_IndexOutOfBoundsException(), NULL);

   }

   oop element = java_lang_StackTraceElement::create(method, bci, CHECK_0);

   return element;

 }

 oop java_lang_StackTraceElement::create(methodHandle method, int bci, TRAPS) {

   // SystemDictionary::stackTraceElement_klass() will be null for pre-1.4 JDKs

   assert(JDK_Version::is_gte_jdk14x_version(), "should only be called in >= 1.4");

   // Allocate java.lang.StackTraceElement instance

   klassOop k = SystemDictionary::stackTraceElement_klass();

   assert(k != NULL, "must be loaded in 1.4+");

   instanceKlassHandle ik (THREAD, k);

   if (ik->should_be_initialized()) {

     ik->initialize(CHECK_0);

   }

   Handle element = ik->allocate_instance_handle(CHECK_0);

   // Fill in class name

   ResourceMark rm(THREAD);

   const char* str = instanceKlass::cast(method->method_holder())->external_name();

   oop classname = StringTable::intern((char*) str, CHECK_0);

   java_lang_StackTraceElement::set_declaringClass(element(), classname);

   // Fill in method name

   oop methodname = StringTable::intern(method->name(), CHECK_0);

   java_lang_StackTraceElement::set_methodName(element(), methodname);

   // Fill in source file name

   symbolOop source = instanceKlass::cast(method->method_holder())->source_file_name();

   oop filename = StringTable::intern(source, CHECK_0);

   java_lang_StackTraceElement::set_fileName(element(), filename);

   // File in source line number

   int line_number;

   if (method->is_native()) {

     // Negative value different from -1 below, enabling Java code in

     // class java.lang.StackTraceElement to distinguish "native" from

     // "no LineNumberTable".

     line_number = -2;

   } else {

     // Returns -1 if no LineNumberTable, and otherwise actual line number

     line_number = method->line_number_from_bci(bci);

   }

   java_lang_StackTraceElement::set_lineNumber(element(), line_number);

   return element();

 }

 void java_lang_reflect_AccessibleObject::compute_offsets() {

   klassOop k = SystemDictionary::reflect_accessible_object_klass();

   compute_offset(override_offset, k, vmSymbols::override_name(), vmSymbols::bool_signature());

 }

 jboolean java_lang_reflect_AccessibleObject::override(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return (jboolean) reflect->bool_field(override_offset);

 }

 void java_lang_reflect_AccessibleObject::set_override(oop reflect, jboolean value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   reflect->bool_field_put(override_offset, (int) value);

 }

 void java_lang_reflect_Method::compute_offsets() {

   klassOop k = SystemDictionary::reflect_method_klass();

   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());

   compute_offset(name_offset,           k, vmSymbols::name_name(),           vmSymbols::string_signature());

   compute_offset(returnType_offset,     k, vmSymbols::returnType_name(),     vmSymbols::class_signature());

   compute_offset(parameterTypes_offset, k, vmSymbols::parameterTypes_name(), vmSymbols::class_array_signature());

   compute_offset(exceptionTypes_offset, k, vmSymbols::exceptionTypes_name(), vmSymbols::class_array_signature());

   compute_offset(slot_offset,           k, vmSymbols::slot_name(),           vmSymbols::int_signature());

   compute_offset(modifiers_offset,      k, vmSymbols::modifiers_name(),      vmSymbols::int_signature());

   // The generic signature and annotations fields are only present in 1.5

   signature_offset = -1;

   annotations_offset = -1;

   parameter_annotations_offset = -1;

   annotation_default_offset = -1;

   compute_optional_offset(signature_offset,             k, vmSymbols::signature_name(),             vmSymbols::string_signature());

   compute_optional_offset(annotations_offset,           k, vmSymbols::annotations_name(),           vmSymbols::byte_array_signature());

   compute_optional_offset(parameter_annotations_offset, k, vmSymbols::parameter_annotations_name(), vmSymbols::byte_array_signature());

   compute_optional_offset(annotation_default_offset,    k, vmSymbols::annotation_default_name(),    vmSymbols::byte_array_signature());

 }

 Handle java_lang_reflect_Method::create(TRAPS) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   klassOop klass = SystemDictionary::reflect_method_klass();

   // This class is eagerly initialized during VM initialization, since we keep a refence

   // to one of the methods

   assert(instanceKlass::cast(klass)->is_initialized(), "must be initialized");

   return instanceKlass::cast(klass)->allocate_instance_handle(CHECK_NH);

 }

 oop java_lang_reflect_Method::clazz(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->obj_field(clazz_offset);

 }

 void java_lang_reflect_Method::set_clazz(oop reflect, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

    reflect->obj_field_put(clazz_offset, value);

 }

 int java_lang_reflect_Method::slot(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->int_field(slot_offset);

 }

 void java_lang_reflect_Method::set_slot(oop reflect, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   reflect->int_field_put(slot_offset, value);

 }

 oop java_lang_reflect_Method::name(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return method->obj_field(name_offset);

 }

 void java_lang_reflect_Method::set_name(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   method->obj_field_put(name_offset, value);

 }

 oop java_lang_reflect_Method::return_type(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return method->obj_field(returnType_offset);

 }

 void java_lang_reflect_Method::set_return_type(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   method->obj_field_put(returnType_offset, value);

 }

 oop java_lang_reflect_Method::parameter_types(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return method->obj_field(parameterTypes_offset);

 }

 void java_lang_reflect_Method::set_parameter_types(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   method->obj_field_put(parameterTypes_offset, value);

 }

 oop java_lang_reflect_Method::exception_types(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return method->obj_field(exceptionTypes_offset);

 }

 void java_lang_reflect_Method::set_exception_types(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   method->obj_field_put(exceptionTypes_offset, value);

 }

 int java_lang_reflect_Method::modifiers(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return method->int_field(modifiers_offset);

 }

 void java_lang_reflect_Method::set_modifiers(oop method, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   method->int_field_put(modifiers_offset, value);

 }

 bool java_lang_reflect_Method::has_signature_field() {

   return (signature_offset >= 0);

 }

 oop java_lang_reflect_Method::signature(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   return method->obj_field(signature_offset);

 }

 void java_lang_reflect_Method::set_signature(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   method->obj_field_put(signature_offset, value);

 }

 bool java_lang_reflect_Method::has_annotations_field() {

   return (annotations_offset >= 0);

 }

 oop java_lang_reflect_Method::annotations(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   return method->obj_field(annotations_offset);

 }

 void java_lang_reflect_Method::set_annotations(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   method->obj_field_put(annotations_offset, value);

 }

 bool java_lang_reflect_Method::has_parameter_annotations_field() {

   return (parameter_annotations_offset >= 0);

 }

 oop java_lang_reflect_Method::parameter_annotations(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_parameter_annotations_field(), "parameter annotations field must be present");

   return method->obj_field(parameter_annotations_offset);

 }

 void java_lang_reflect_Method::set_parameter_annotations(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_parameter_annotations_field(), "parameter annotations field must be present");

   method->obj_field_put(parameter_annotations_offset, value);

 }

 bool java_lang_reflect_Method::has_annotation_default_field() {

   return (annotation_default_offset >= 0);

 }

 oop java_lang_reflect_Method::annotation_default(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotation_default_field(), "annotation default field must be present");

   return method->obj_field(annotation_default_offset);

 }

 void java_lang_reflect_Method::set_annotation_default(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotation_default_field(), "annotation default field must be present");

   method->obj_field_put(annotation_default_offset, value);

 }

 void java_lang_reflect_Constructor::compute_offsets() {

   klassOop k = SystemDictionary::reflect_constructor_klass();

   compute_offset(clazz_offset,          k, vmSymbols::clazz_name(),          vmSymbols::class_signature());

   compute_offset(parameterTypes_offset, k, vmSymbols::parameterTypes_name(), vmSymbols::class_array_signature());

   compute_offset(exceptionTypes_offset, k, vmSymbols::exceptionTypes_name(), vmSymbols::class_array_signature());

   compute_offset(slot_offset,           k, vmSymbols::slot_name(),           vmSymbols::int_signature());

   compute_offset(modifiers_offset,      k, vmSymbols::modifiers_name(),      vmSymbols::int_signature());

   // The generic signature and annotations fields are only present in 1.5

   signature_offset = -1;

   annotations_offset = -1;

   parameter_annotations_offset = -1;

   compute_optional_offset(signature_offset,             k, vmSymbols::signature_name(),             vmSymbols::string_signature());

   compute_optional_offset(annotations_offset,           k, vmSymbols::annotations_name(),           vmSymbols::byte_array_signature());

   compute_optional_offset(parameter_annotations_offset, k, vmSymbols::parameter_annotations_name(), vmSymbols::byte_array_signature());

 }

 Handle java_lang_reflect_Constructor::create(TRAPS) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   symbolHandle name = vmSymbolHandles::java_lang_reflect_Constructor();

   klassOop k = SystemDictionary::resolve_or_fail(name, true, CHECK_NH);

   instanceKlassHandle klass (THREAD, k);

   // Ensure it is initialized

   klass->initialize(CHECK_NH);

   return klass->allocate_instance_handle(CHECK_NH);

 }

 oop java_lang_reflect_Constructor::clazz(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->obj_field(clazz_offset);

 }

 void java_lang_reflect_Constructor::set_clazz(oop reflect, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

    reflect->obj_field_put(clazz_offset, value);

 }

 oop java_lang_reflect_Constructor::parameter_types(oop constructor) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return constructor->obj_field(parameterTypes_offset);

 }

 void java_lang_reflect_Constructor::set_parameter_types(oop constructor, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   constructor->obj_field_put(parameterTypes_offset, value);

 }

 oop java_lang_reflect_Constructor::exception_types(oop constructor) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return constructor->obj_field(exceptionTypes_offset);

 }

 void java_lang_reflect_Constructor::set_exception_types(oop constructor, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   constructor->obj_field_put(exceptionTypes_offset, value);

 }

 int java_lang_reflect_Constructor::slot(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->int_field(slot_offset);

 }

 void java_lang_reflect_Constructor::set_slot(oop reflect, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   reflect->int_field_put(slot_offset, value);

 }

 int java_lang_reflect_Constructor::modifiers(oop constructor) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return constructor->int_field(modifiers_offset);

 }

 void java_lang_reflect_Constructor::set_modifiers(oop constructor, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   constructor->int_field_put(modifiers_offset, value);

 }

 bool java_lang_reflect_Constructor::has_signature_field() {

   return (signature_offset >= 0);

 }

 oop java_lang_reflect_Constructor::signature(oop constructor) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   return constructor->obj_field(signature_offset);

 }

 void java_lang_reflect_Constructor::set_signature(oop constructor, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   constructor->obj_field_put(signature_offset, value);

 }

 bool java_lang_reflect_Constructor::has_annotations_field() {

   return (annotations_offset >= 0);

 }

 oop java_lang_reflect_Constructor::annotations(oop constructor) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   return constructor->obj_field(annotations_offset);

 }

 void java_lang_reflect_Constructor::set_annotations(oop constructor, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   constructor->obj_field_put(annotations_offset, value);

 }

 bool java_lang_reflect_Constructor::has_parameter_annotations_field() {

   return (parameter_annotations_offset >= 0);

 }

 oop java_lang_reflect_Constructor::parameter_annotations(oop method) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_parameter_annotations_field(), "parameter annotations field must be present");

   return method->obj_field(parameter_annotations_offset);

 }

 void java_lang_reflect_Constructor::set_parameter_annotations(oop method, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_parameter_annotations_field(), "parameter annotations field must be present");

   method->obj_field_put(parameter_annotations_offset, value);

 }

 void java_lang_reflect_Field::compute_offsets() {

   klassOop k = SystemDictionary::reflect_field_klass();

   compute_offset(clazz_offset,     k, vmSymbols::clazz_name(),     vmSymbols::class_signature());

   compute_offset(name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());

   compute_offset(type_offset,      k, vmSymbols::type_name(),      vmSymbols::class_signature());

   compute_offset(slot_offset,      k, vmSymbols::slot_name(),      vmSymbols::int_signature());

   compute_offset(modifiers_offset, k, vmSymbols::modifiers_name(), vmSymbols::int_signature());

   // The generic signature and annotations fields are only present in 1.5

   signature_offset = -1;

   annotations_offset = -1;

   compute_optional_offset(signature_offset, k, vmSymbols::signature_name(), vmSymbols::string_signature());

   compute_optional_offset(annotations_offset,  k, vmSymbols::annotations_name(),  vmSymbols::byte_array_signature());

 }

 Handle java_lang_reflect_Field::create(TRAPS) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   symbolHandle name = vmSymbolHandles::java_lang_reflect_Field();

   klassOop k = SystemDictionary::resolve_or_fail(name, true, CHECK_NH);

   instanceKlassHandle klass (THREAD, k);

   // Ensure it is initialized

   klass->initialize(CHECK_NH);

   return klass->allocate_instance_handle(CHECK_NH);

 }

 oop java_lang_reflect_Field::clazz(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->obj_field(clazz_offset);

 }

 void java_lang_reflect_Field::set_clazz(oop reflect, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

    reflect->obj_field_put(clazz_offset, value);

 }

 oop java_lang_reflect_Field::name(oop field) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return field->obj_field(name_offset);

 }

 void java_lang_reflect_Field::set_name(oop field, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   field->obj_field_put(name_offset, value);

 }

 oop java_lang_reflect_Field::type(oop field) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return field->obj_field(type_offset);

 }

 void java_lang_reflect_Field::set_type(oop field, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   field->obj_field_put(type_offset, value);

 }

 int java_lang_reflect_Field::slot(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->int_field(slot_offset);

 }

 void java_lang_reflect_Field::set_slot(oop reflect, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   reflect->int_field_put(slot_offset, value);

 }

 int java_lang_reflect_Field::modifiers(oop field) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return field->int_field(modifiers_offset);

 }

 void java_lang_reflect_Field::set_modifiers(oop field, int value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   field->int_field_put(modifiers_offset, value);

 }

 bool java_lang_reflect_Field::has_signature_field() {

   return (signature_offset >= 0);

 }

 oop java_lang_reflect_Field::signature(oop field) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   return field->obj_field(signature_offset);

 }

 void java_lang_reflect_Field::set_signature(oop field, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_signature_field(), "signature field must be present");

   field->obj_field_put(signature_offset, value);

 }

 bool java_lang_reflect_Field::has_annotations_field() {

   return (annotations_offset >= 0);

 }

 oop java_lang_reflect_Field::annotations(oop field) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   return field->obj_field(annotations_offset);

 }

 void java_lang_reflect_Field::set_annotations(oop field, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   assert(has_annotations_field(), "annotations field must be present");

   field->obj_field_put(annotations_offset, value);

 }

 void sun_reflect_ConstantPool::compute_offsets() {

   klassOop k = SystemDictionary::reflect_constant_pool_klass();

   // This null test can be removed post beta

   if (k != NULL) {

     compute_offset(_cp_oop_offset, k, vmSymbols::constantPoolOop_name(), vmSymbols::object_signature());

   }

 }

 Handle sun_reflect_ConstantPool::create(TRAPS) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   klassOop k = SystemDictionary::reflect_constant_pool_klass();

   instanceKlassHandle klass (THREAD, k);

   // Ensure it is initialized

   klass->initialize(CHECK_NH);

   return klass->allocate_instance_handle(CHECK_NH);

 }

 oop sun_reflect_ConstantPool::cp_oop(oop reflect) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   return reflect->obj_field(_cp_oop_offset);

 }

 void sun_reflect_ConstantPool::set_cp_oop(oop reflect, oop value) {

   assert(Universe::is_fully_initialized(), "Need to find another solution to the reflection problem");

   reflect->obj_field_put(_cp_oop_offset, value);

 }

 void sun_reflect_UnsafeStaticFieldAccessorImpl::compute_offsets() {

   klassOop k = SystemDictionary::reflect_unsafe_static_field_accessor_impl_klass();

   // This null test can be removed post beta

   if (k != NULL) {

     compute_offset(_base_offset, k,

                    vmSymbols::base_name(), vmSymbols::object_signature());

   }

 }

 oop java_lang_boxing_object::initialize_and_allocate(BasicType type, TRAPS) {

   klassOop k = SystemDictionary::box_klass(type);

   if (k == NULL)  return NULL;

   instanceKlassHandle h (THREAD, k);

   if (!h->is_initialized())  h->initialize(CHECK_0);

   return h->allocate_instance(THREAD);

 }

 oop java_lang_boxing_object::create(BasicType type, jvalue* value, TRAPS) {

   oop box = initialize_and_allocate(type, CHECK_0);

   if (box == NULL)  return NULL;

   switch (type) {

     case T_BOOLEAN:

       box->bool_field_put(value_offset, value->z);

       break;

     case T_CHAR:

       box->char_field_put(value_offset, value->c);

       break;

     case T_FLOAT:

       box->float_field_put(value_offset, value->f);

       break;

     case T_DOUBLE:

       box->double_field_put(long_value_offset, value->d);

       break;

     case T_BYTE:

       box->byte_field_put(value_offset, value->b);

       break;

     case T_SHORT:

       box->short_field_put(value_offset, value->s);

       break;

     case T_INT:

       box->int_field_put(value_offset, value->i);

       break;

     case T_LONG:

       box->long_field_put(long_value_offset, value->j);

       break;

     default:

       return NULL;

   }

   return box;

 }

 BasicType java_lang_boxing_object::basic_type(oop box) {

   if (box == NULL)  return T_ILLEGAL;

   BasicType type = SystemDictionary::box_klass_type(box->klass());

   if (type == T_OBJECT)         // 'unknown' value returned by SD::bkt

     return T_ILLEGAL;

   return type;

 }

 BasicType java_lang_boxing_object::get_value(oop box, jvalue* value) {

   BasicType type = SystemDictionary::box_klass_type(box->klass());

   switch (type) {

   case T_BOOLEAN:

     value->z = box->bool_field(value_offset);

     break;

   case T_CHAR:

     value->c = box->char_field(value_offset);

     break;

   case T_FLOAT:

     value->f = box->float_field(value_offset);

     break;

   case T_DOUBLE:

     value->d = box->double_field(long_value_offset);

     break;

   case T_BYTE:

     value->b = box->byte_field(value_offset);

     break;

   case T_SHORT:

     value->s = box->short_field(value_offset);

     break;

   case T_INT:

     value->i = box->int_field(value_offset);

     break;

   case T_LONG:

     value->j = box->long_field(long_value_offset);

     break;

   default:

     return T_ILLEGAL;

   } // end switch

   return type;

 }

 BasicType java_lang_boxing_object::set_value(oop box, jvalue* value) {

   BasicType type = SystemDictionary::box_klass_type(box->klass());

   switch (type) {

   case T_BOOLEAN:

     box->bool_field_put(value_offset, value->z);

     break;

   case T_CHAR:

     box->char_field_put(value_offset, value->c);

     break;

   case T_FLOAT:

     box->float_field_put(value_offset, value->f);

     break;

   case T_DOUBLE:

     box->double_field_put(long_value_offset, value->d);

     break;

   case T_BYTE:

     box->byte_field_put(value_offset, value->b);

     break;

   case T_SHORT:

     box->short_field_put(value_offset, value->s);

     break;

   case T_INT:

     box->int_field_put(value_offset, value->i);

     break;

   case T_LONG:

     box->long_field_put(long_value_offset, value->j);

     break;

   default:

     return T_ILLEGAL;

   } // end switch

   return type;

 }

 // Support for java_lang_ref_Reference

 oop java_lang_ref_Reference::pending_list_lock() {

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::reference_klass());

   char *addr = (((char *)ik->start_of_static_fields()) + static_lock_offset);

   if (UseCompressedOops) {

     return oopDesc::load_decode_heap_oop((narrowOop *)addr);

   } else {

     return oopDesc::load_decode_heap_oop((oop*)addr);

   }

 }

 HeapWord *java_lang_ref_Reference::pending_list_addr() {

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::reference_klass());

   char *addr = (((char *)ik->start_of_static_fields()) + static_pending_offset);

   // XXX This might not be HeapWord aligned, almost rather be char *.

   return (HeapWord*)addr;

 }

 oop java_lang_ref_Reference::pending_list() {

   char *addr = (char *)pending_list_addr();

   if (UseCompressedOops) {

     return oopDesc::load_decode_heap_oop((narrowOop *)addr);

   } else {

     return oopDesc::load_decode_heap_oop((oop*)addr);

   }

 }

 // Support for java_lang_ref_SoftReference

 jlong java_lang_ref_SoftReference::timestamp(oop ref) {

   return ref->long_field(timestamp_offset);

 }

 jlong java_lang_ref_SoftReference::clock() {

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::soft_reference_klass());

   int offset = ik->offset_of_static_fields() + static_clock_offset;

   return SystemDictionary::soft_reference_klass()->long_field(offset);

 }

 void java_lang_ref_SoftReference::set_clock(jlong value) {

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::soft_reference_klass());

   int offset = ik->offset_of_static_fields() + static_clock_offset;

   SystemDictionary::soft_reference_klass()->long_field_put(offset, value);

 }

 // Support for java_security_AccessControlContext

 int java_security_AccessControlContext::_context_offset = 0;

 int java_security_AccessControlContext::_privilegedContext_offset = 0;

 int java_security_AccessControlContext::_isPrivileged_offset = 0;

 void java_security_AccessControlContext::compute_offsets() {

   assert(_isPrivileged_offset == 0, "offsets should be initialized only once");

   fieldDescriptor fd;

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::AccessControlContext_klass());

   if (!ik->find_local_field(vmSymbols::context_name(), vmSymbols::protectiondomain_signature(), &fd)) {

     fatal("Invalid layout of java.security.AccessControlContext");

   }

   _context_offset = fd.offset();

   if (!ik->find_local_field(vmSymbols::privilegedContext_name(), vmSymbols::accesscontrolcontext_signature(), &fd)) {

     fatal("Invalid layout of java.security.AccessControlContext");

   }

   _privilegedContext_offset = fd.offset();

   if (!ik->find_local_field(vmSymbols::isPrivileged_name(), vmSymbols::bool_signature(), &fd)) {

     fatal("Invalid layout of java.security.AccessControlContext");

   }

   _isPrivileged_offset = fd.offset();

 }

 oop java_security_AccessControlContext::create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS) {

   assert(_isPrivileged_offset != 0, "offsets should have been initialized");

   // Ensure klass is initialized

   instanceKlass::cast(SystemDictionary::AccessControlContext_klass())->initialize(CHECK_0);

   // Allocate result

   oop result = instanceKlass::cast(SystemDictionary::AccessControlContext_klass())->allocate_instance(CHECK_0);

   // Fill in values

   result->obj_field_put(_context_offset, context());

   result->obj_field_put(_privilegedContext_offset, privileged_context());

   result->bool_field_put(_isPrivileged_offset, isPrivileged);

   return result;

 }

 // Support for java_lang_ClassLoader

 oop java_lang_ClassLoader::parent(oop loader) {

   assert(loader->is_oop(), "loader must be oop");

   return loader->obj_field(parent_offset);

 }

 bool java_lang_ClassLoader::is_trusted_loader(oop loader) {

   // Fix for 4474172; see evaluation for more details

   loader = non_reflection_class_loader(loader);

   oop cl = SystemDictionary::java_system_loader();

   while(cl != NULL) {

     if (cl == loader) return true;

     cl = parent(cl);

   }

   return false;

 }

 oop java_lang_ClassLoader::non_reflection_class_loader(oop loader) {

   if (loader != NULL) {

     // See whether this is one of the class loaders associated with

     // the generated bytecodes for reflection, and if so, "magically"

     // delegate to its parent to prevent class loading from occurring

     // in places where applications using reflection didn't expect it.

     klassOop delegating_cl_class = SystemDictionary::reflect_delegating_classloader_klass();

     // This might be null in non-1.4 JDKs

     if (delegating_cl_class != NULL && loader->is_a(delegating_cl_class)) {

       return parent(loader);

     }

   }

   return loader;

 }

 // Support for java_lang_System

 void java_lang_System::compute_offsets() {

   assert(offset_of_static_fields == 0, "offsets should be initialized only once");

   instanceKlass* ik = instanceKlass::cast(SystemDictionary::system_klass());

   offset_of_static_fields = ik->offset_of_static_fields();

 }

 int java_lang_System::in_offset_in_bytes() {

   return (offset_of_static_fields + static_in_offset);

 }

 int java_lang_System::out_offset_in_bytes() {

   return (offset_of_static_fields + static_out_offset);

 }

 int java_lang_System::err_offset_in_bytes() {

   return (offset_of_static_fields + static_err_offset);

 }

 int java_lang_String::value_offset;

 int java_lang_String::offset_offset;

 int java_lang_String::count_offset;

 int java_lang_String::hash_offset;

 int java_lang_Class::klass_offset;

 int java_lang_Class::array_klass_offset;

 int java_lang_Class::resolved_constructor_offset;

 int java_lang_Class::number_of_fake_oop_fields;

 int java_lang_Throwable::backtrace_offset;

 int java_lang_Throwable::detailMessage_offset;

 int java_lang_Throwable::cause_offset;

 int java_lang_Throwable::stackTrace_offset;

 int java_lang_reflect_AccessibleObject::override_offset;

 int java_lang_reflect_Method::clazz_offset;

 int java_lang_reflect_Method::name_offset;

 int java_lang_reflect_Method::returnType_offset;

 int java_lang_reflect_Method::parameterTypes_offset;

 int java_lang_reflect_Method::exceptionTypes_offset;

 int java_lang_reflect_Method::slot_offset;

 int java_lang_reflect_Method::modifiers_offset;

 int java_lang_reflect_Method::signature_offset;

 int java_lang_reflect_Method::annotations_offset;

 int java_lang_reflect_Method::parameter_annotations_offset;

 int java_lang_reflect_Method::annotation_default_offset;

 int java_lang_reflect_Constructor::clazz_offset;

 int java_lang_reflect_Constructor::parameterTypes_offset;

 int java_lang_reflect_Constructor::exceptionTypes_offset;

 int java_lang_reflect_Constructor::slot_offset;

 int java_lang_reflect_Constructor::modifiers_offset;

 int java_lang_reflect_Constructor::signature_offset;

 int java_lang_reflect_Constructor::annotations_offset;

 int java_lang_reflect_Constructor::parameter_annotations_offset;

 int java_lang_reflect_Field::clazz_offset;

 int java_lang_reflect_Field::name_offset;

 int java_lang_reflect_Field::type_offset;

 int java_lang_reflect_Field::slot_offset;

 int java_lang_reflect_Field::modifiers_offset;

 int java_lang_reflect_Field::signature_offset;

 int java_lang_reflect_Field::annotations_offset;

 int java_lang_boxing_object::value_offset;

 int java_lang_boxing_object::long_value_offset;

 int java_lang_ref_Reference::referent_offset;

 int java_lang_ref_Reference::queue_offset;

 int java_lang_ref_Reference::next_offset;

 int java_lang_ref_Reference::discovered_offset;

 int java_lang_ref_Reference::static_lock_offset;

 int java_lang_ref_Reference::static_pending_offset;

 int java_lang_ref_Reference::number_of_fake_oop_fields;

 int java_lang_ref_SoftReference::timestamp_offset;

 int java_lang_ref_SoftReference::static_clock_offset;

 int java_lang_ClassLoader::parent_offset;

 int java_lang_System::offset_of_static_fields;

 int java_lang_System::static_in_offset;

 int java_lang_System::static_out_offset;

 int java_lang_System::static_err_offset;

 int java_lang_StackTraceElement::declaringClass_offset;

 int java_lang_StackTraceElement::methodName_offset;

 int java_lang_StackTraceElement::fileName_offset;

 int java_lang_StackTraceElement::lineNumber_offset;

 int java_lang_AssertionStatusDirectives::classes_offset;

 int java_lang_AssertionStatusDirectives::classEnabled_offset;

 int java_lang_AssertionStatusDirectives::packages_offset;

 int java_lang_AssertionStatusDirectives::packageEnabled_offset;

 int java_lang_AssertionStatusDirectives::deflt_offset;

 int java_nio_Buffer::_limit_offset;

 int sun_misc_AtomicLongCSImpl::_value_offset;

 int java_util_concurrent_locks_AbstractOwnableSynchronizer::_owner_offset = 0;

 int sun_reflect_ConstantPool::_cp_oop_offset;

 int sun_reflect_UnsafeStaticFieldAccessorImpl::_base_offset;

 // Support for java_lang_StackTraceElement

 void java_lang_StackTraceElement::set_fileName(oop element, oop value) {

   element->obj_field_put(fileName_offset, value);

 }

 void java_lang_StackTraceElement::set_declaringClass(oop element, oop value) {

   element->obj_field_put(declaringClass_offset, value);

 }

 void java_lang_StackTraceElement::set_methodName(oop element, oop value) {

   element->obj_field_put(methodName_offset, value);

 }

 void java_lang_StackTraceElement::set_lineNumber(oop element, int value) {

   element->int_field_put(lineNumber_offset, value);

 }

 // Support for java Assertions - java_lang_AssertionStatusDirectives.

 void java_lang_AssertionStatusDirectives::set_classes(oop o, oop val) {

   o->obj_field_put(classes_offset, val);

 }

 void java_lang_AssertionStatusDirectives::set_classEnabled(oop o, oop val) {

   o->obj_field_put(classEnabled_offset, val);

 }

 void java_lang_AssertionStatusDirectives::set_packages(oop o, oop val) {

   o->obj_field_put(packages_offset, val);

 }

 void java_lang_AssertionStatusDirectives::set_packageEnabled(oop o, oop val) {

   o->obj_field_put(packageEnabled_offset, val);

 }

 void java_lang_AssertionStatusDirectives::set_deflt(oop o, bool val) {

   o->bool_field_put(deflt_offset, val);

 }

 // Support for intrinsification of java.nio.Buffer.checkIndex

 int java_nio_Buffer::limit_offset() {

   return _limit_offset;

 }

 void java_nio_Buffer::compute_offsets() {

   klassOop k = SystemDictionary::java_nio_Buffer_klass();

   assert(k != NULL, "must be loaded in 1.4+");

   compute_offset(_limit_offset, k, vmSymbols::limit_name(), vmSymbols::int_signature());

 }

 // Support for intrinsification of sun.misc.AtomicLongCSImpl.attemptUpdate

 int sun_misc_AtomicLongCSImpl::value_offset() {

   assert(SystemDictionary::sun_misc_AtomicLongCSImpl_klass() != NULL, "can't call this");

   return _value_offset;

 }

 void sun_misc_AtomicLongCSImpl::compute_offsets() {

   klassOop k = SystemDictionary::sun_misc_AtomicLongCSImpl_klass();

   // If this class is not present, its value field offset won't be referenced.

   if (k != NULL) {

     compute_offset(_value_offset, k, vmSymbols::value_name(), vmSymbols::long_signature());

   }

 }

 void java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(TRAPS) {

   if (_owner_offset != 0) return;

   assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later");

   SystemDictionary::load_abstract_ownable_synchronizer_klass(CHECK);

   klassOop k = SystemDictionary::abstract_ownable_synchronizer_klass();

   compute_offset(_owner_offset, k,

                  vmSymbols::exclusive_owner_thread_name(), vmSymbols::thread_signature());

 }

 oop java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(oop obj) {

   assert(_owner_offset != 0, "Must be initialized");

   return obj->obj_field(_owner_offset);

 }

 // Compute hard-coded offsets

 // Invoked before SystemDictionary::initialize, so pre-loaded classes

 // are not available to determine the offset_of_static_fields.

 void JavaClasses::compute_hard_coded_offsets() {

   const int x = heapOopSize;

   const int header = instanceOopDesc::base_offset_in_bytes();

   // Do the String Class

   java_lang_String::value_offset  = java_lang_String::hc_value_offset  * x + header;

   java_lang_String::offset_offset = java_lang_String::hc_offset_offset * x + header;

   java_lang_String::count_offset  = java_lang_String::offset_offset + sizeof (jint);

   java_lang_String::hash_offset   = java_lang_String::count_offset + sizeof (jint);

   // Do the Class Class

   java_lang_Class::klass_offset = java_lang_Class::hc_klass_offset * x + header;

   java_lang_Class::array_klass_offset = java_lang_Class::hc_array_klass_offset * x + header;

   java_lang_Class::resolved_constructor_offset = java_lang_Class::hc_resolved_constructor_offset * x + header;

   // This is NOT an offset

   java_lang_Class::number_of_fake_oop_fields = java_lang_Class::hc_number_of_fake_oop_fields;

   // Throwable Class

   java_lang_Throwable::backtrace_offset  = java_lang_Throwable::hc_backtrace_offset  * x + header;

   java_lang_Throwable::detailMessage_offset = java_lang_Throwable::hc_detailMessage_offset * x + header;

   java_lang_Throwable::cause_offset      = java_lang_Throwable::hc_cause_offset      * x + header;

   java_lang_Throwable::stackTrace_offset = java_lang_Throwable::hc_stackTrace_offset * x + header;

   // java_lang_boxing_object

   java_lang_boxing_object::value_offset = java_lang_boxing_object::hc_value_offset + header;

   java_lang_boxing_object::long_value_offset = align_size_up((java_lang_boxing_object::hc_value_offset + header), BytesPerLong);

   // java_lang_ref_Reference:

   java_lang_ref_Reference::referent_offset = java_lang_ref_Reference::hc_referent_offset * x + header;

   java_lang_ref_Reference::queue_offset = java_lang_ref_Reference::hc_queue_offset * x + header;

   java_lang_ref_Reference::next_offset  = java_lang_ref_Reference::hc_next_offset * x + header;

   java_lang_ref_Reference::discovered_offset  = java_lang_ref_Reference::hc_discovered_offset * x + header;

   java_lang_ref_Reference::static_lock_offset = java_lang_ref_Reference::hc_static_lock_offset *  x;

   java_lang_ref_Reference::static_pending_offset = java_lang_ref_Reference::hc_static_pending_offset * x;

   // Artificial fields for java_lang_ref_Reference

   // The first field is for the discovered field added in 1.4

   java_lang_ref_Reference::number_of_fake_oop_fields = 1;

   // java_lang_ref_SoftReference Class

   java_lang_ref_SoftReference::timestamp_offset = align_size_up((java_lang_ref_SoftReference::hc_timestamp_offset * x + header), BytesPerLong);

   // Don't multiply static fields because they are always in wordSize units

   java_lang_ref_SoftReference::static_clock_offset = java_lang_ref_SoftReference::hc_static_clock_offset * x;

   // java_lang_ClassLoader

   java_lang_ClassLoader::parent_offset = java_lang_ClassLoader::hc_parent_offset * x + header;

   // java_lang_System

   java_lang_System::static_in_offset  = java_lang_System::hc_static_in_offset  * x;

   java_lang_System::static_out_offset = java_lang_System::hc_static_out_offset * x;

   java_lang_System::static_err_offset = java_lang_System::hc_static_err_offset * x;

   // java_lang_StackTraceElement

   java_lang_StackTraceElement::declaringClass_offset = java_lang_StackTraceElement::hc_declaringClass_offset  * x + header;

   java_lang_StackTraceElement::methodName_offset = java_lang_StackTraceElement::hc_methodName_offset * x + header;

   java_lang_StackTraceElement::fileName_offset   = java_lang_StackTraceElement::hc_fileName_offset   * x + header;

   java_lang_StackTraceElement::lineNumber_offset = java_lang_StackTraceElement::hc_lineNumber_offset * x + header;

   java_lang_AssertionStatusDirectives::classes_offset = java_lang_AssertionStatusDirectives::hc_classes_offset * x + header;

   java_lang_AssertionStatusDirectives::classEnabled_offset = java_lang_AssertionStatusDirectives::hc_classEnabled_offset * x + header;

   java_lang_AssertionStatusDirectives::packages_offset = java_lang_AssertionStatusDirectives::hc_packages_offset * x + header;

   java_lang_AssertionStatusDirectives::packageEnabled_offset = java_lang_AssertionStatusDirectives::hc_packageEnabled_offset * x + header;

   java_lang_AssertionStatusDirectives::deflt_offset = java_lang_AssertionStatusDirectives::hc_deflt_offset * x + header;

 }

 // Compute non-hard-coded field offsets of all the classes in this file

 void JavaClasses::compute_offsets() {

   java_lang_Class::compute_offsets();

   java_lang_System::compute_offsets();

   java_lang_Thread::compute_offsets();

   java_lang_ThreadGroup::compute_offsets();

   java_security_AccessControlContext::compute_offsets();

   // Initialize reflection classes. The layouts of these classes

   // changed with the new reflection implementation in JDK 1.4, and

   // since the Universe doesn't know what JDK version it is until this

   // point we defer computation of these offsets until now.

   java_lang_reflect_AccessibleObject::compute_offsets();

   java_lang_reflect_Method::compute_offsets();

   java_lang_reflect_Constructor::compute_offsets();

   java_lang_reflect_Field::compute_offsets();

   if (JDK_Version::is_gte_jdk14x_version()) {

     java_nio_Buffer::compute_offsets();

   }

   if (JDK_Version::is_gte_jdk15x_version()) {

     sun_reflect_ConstantPool::compute_offsets();

     sun_reflect_UnsafeStaticFieldAccessorImpl::compute_offsets();

   }

   sun_misc_AtomicLongCSImpl::compute_offsets();

 }

 #ifndef PRODUCT

 // These functions exist to assert the validity of hard-coded field offsets to guard

 // against changes in the class files

 bool JavaClasses::check_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) {

   EXCEPTION_MARK;

   fieldDescriptor fd;

   symbolHandle klass_sym = oopFactory::new_symbol_handle(klass_name, CATCH);

   klassOop k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);

   instanceKlassHandle h_klass (THREAD, k);

   //instanceKlassHandle h_klass(klass);

   symbolHandle f_name = oopFactory::new_symbol_handle(field_name, CATCH);

   symbolHandle f_sig  = oopFactory::new_symbol_handle(field_sig, CATCH);

   if (!h_klass->find_local_field(f_name(), f_sig(), &fd)) {

     tty->print_cr("Nonstatic field %s.%s not found", klass_name, field_name);

     return false;

   }

   if (fd.is_static()) {

     tty->print_cr("Nonstatic field %s.%s appears to be static", klass_name, field_name);

     return false;

   }

   if (fd.offset() == hardcoded_offset ) {

     return true;

   } else {

     tty->print_cr("Offset of nonstatic field %s.%s is hardcoded as %d but should really be %d.",

                   klass_name, field_name, hardcoded_offset, fd.offset());

     return false;

   }

 }

 bool JavaClasses::check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) {

   EXCEPTION_MARK;

   fieldDescriptor fd;

   symbolHandle klass_sym = oopFactory::new_symbol_handle(klass_name, CATCH);

   klassOop k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);

   instanceKlassHandle h_klass (THREAD, k);

   symbolHandle f_name = oopFactory::new_symbol_handle(field_name, CATCH);

   symbolHandle f_sig  = oopFactory::new_symbol_handle(field_sig, CATCH);

   if (!h_klass->find_local_field(f_name(), f_sig(), &fd)) {

     tty->print_cr("Static field %s.%s not found", klass_name, field_name);

     return false;

   }

   if (!fd.is_static()) {

     tty->print_cr("Static field %s.%s appears to be nonstatic", klass_name, field_name);

     return false;

   }

   if (fd.offset() == hardcoded_offset + h_klass->offset_of_static_fields()) {

     return true;

   } else {

     tty->print_cr("Offset of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_offset, fd.offset() - h_klass->offset_of_static_fields());

     return false;

   }

 }

 bool JavaClasses::check_constant(const char *klass_name, int hardcoded_constant, const char *field_name, const char* field_sig) {

   EXCEPTION_MARK;

   fieldDescriptor fd;

   symbolHandle klass_sym = oopFactory::new_symbol_handle(klass_name, CATCH);

   klassOop k = SystemDictionary::resolve_or_fail(klass_sym, true, CATCH);

   instanceKlassHandle h_klass (THREAD, k);

   symbolHandle f_name = oopFactory::new_symbol_handle(field_name, CATCH);

   symbolHandle f_sig  = oopFactory::new_symbol_handle(field_sig, CATCH);

   if (!h_klass->find_local_field(f_name(), f_sig(), &fd)) {

     tty->print_cr("Static field %s.%s not found", klass_name, field_name);

     return false;

   }

   if (!fd.is_static() || !fd.has_initial_value()) {

     tty->print_cr("Static field %s.%s appears to be non-constant", klass_name, field_name);

     return false;

   }

   if (!fd.initial_value_tag().is_int()) {

     tty->print_cr("Static field %s.%s is not an int", klass_name, field_name);

     return false;

   }

   jint field_value = fd.int_initial_value();

   if (field_value == hardcoded_constant) {

     return true;

   } else {

     tty->print_cr("Constant value of static field %s.%s is hardcoded as %d but should really be %d.", klass_name, field_name, hardcoded_constant, field_value);

     return false;

   }

 }

 // Check the hard-coded field offsets of all the classes in this file

 void JavaClasses::check_offsets() {

   bool valid = true;

 #define CHECK_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \

   valid &= check_offset(klass_name, cpp_klass_name :: field_name ## _offset, #field_name, field_sig)

 #define CHECK_LONG_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \

   valid &= check_offset(klass_name, cpp_klass_name :: long_ ## field_name ## _offset, #field_name, field_sig)

 #define CHECK_STATIC_OFFSET(klass_name, cpp_klass_name, field_name, field_sig) \

   valid &= check_static_offset(klass_name, cpp_klass_name :: static_ ## field_name ## _offset, #field_name, field_sig)

 #define CHECK_CONSTANT(klass_name, cpp_klass_name, field_name, field_sig) \

   valid &= check_constant(klass_name, cpp_klass_name :: field_name, #field_name, field_sig)

   // java.lang.String

   CHECK_OFFSET("java/lang/String", java_lang_String, value, "[C");

   CHECK_OFFSET("java/lang/String", java_lang_String, offset, "I");

   CHECK_OFFSET("java/lang/String", java_lang_String, count, "I");

   CHECK_OFFSET("java/lang/String", java_lang_String, hash, "I");

   // java.lang.Class

   // Fake fields

   // CHECK_OFFSET("java/lang/Class", java_lang_Class, klass); // %%% this needs to be checked

   // CHECK_OFFSET("java/lang/Class", java_lang_Class, array_klass); // %%% this needs to be checked

   // CHECK_OFFSET("java/lang/Class", java_lang_Class, resolved_constructor); // %%% this needs to be checked

   // java.lang.Throwable

   CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, backtrace, "Ljava/lang/Object;");

   CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, detailMessage, "Ljava/lang/String;");

   CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, cause, "Ljava/lang/Throwable;");

   CHECK_OFFSET("java/lang/Throwable", java_lang_Throwable, stackTrace, "[Ljava/lang/StackTraceElement;");

   // Boxed primitive objects (java_lang_boxing_object)

   CHECK_OFFSET("java/lang/Boolean",   java_lang_boxing_object, value, "Z");

   CHECK_OFFSET("java/lang/Character", java_lang_boxing_object, value, "C");

   CHECK_OFFSET("java/lang/Float",     java_lang_boxing_object, value, "F");

   CHECK_LONG_OFFSET("java/lang/Double", java_lang_boxing_object, value, "D");

   CHECK_OFFSET("java/lang/Byte",      java_lang_boxing_object, value, "B");

   CHECK_OFFSET("java/lang/Short",     java_lang_boxing_object, value, "S");

   CHECK_OFFSET("java/lang/Integer",   java_lang_boxing_object, value, "I");

   CHECK_LONG_OFFSET("java/lang/Long", java_lang_boxing_object, value, "J");

   // java.lang.ClassLoader

   CHECK_OFFSET("java/lang/ClassLoader", java_lang_ClassLoader, parent,      "Ljava/lang/ClassLoader;");

   // java.lang.System

   CHECK_STATIC_OFFSET("java/lang/System", java_lang_System,  in, "Ljava/io/InputStream;");

   CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, out, "Ljava/io/PrintStream;");

   CHECK_STATIC_OFFSET("java/lang/System", java_lang_System, err, "Ljava/io/PrintStream;");

   // java.lang.StackTraceElement

   CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, declaringClass, "Ljava/lang/String;");

   CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, methodName, "Ljava/lang/String;");

   CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement,   fileName, "Ljava/lang/String;");

   CHECK_OFFSET("java/lang/StackTraceElement", java_lang_StackTraceElement, lineNumber, "I");

   // java.lang.ref.Reference

   CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, referent, "Ljava/lang/Object;");

   CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, queue, "Ljava/lang/ref/ReferenceQueue;");

   CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, next, "Ljava/lang/ref/Reference;");

   // Fake field

   //CHECK_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, discovered, "Ljava/lang/ref/Reference;");

   CHECK_STATIC_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, lock, "Ljava/lang/ref/Reference$Lock;");

   CHECK_STATIC_OFFSET("java/lang/ref/Reference", java_lang_ref_Reference, pending, "Ljava/lang/ref/Reference;");

   // java.lang.ref.SoftReference

   CHECK_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, timestamp, "J");

   CHECK_STATIC_OFFSET("java/lang/ref/SoftReference", java_lang_ref_SoftReference, clock, "J");

   // java.lang.AssertionStatusDirectives

   //

   // The CheckAssertionStatusDirectives boolean can be removed from here and

   // globals.hpp after the AssertionStatusDirectives class has been integrated

   // into merlin "for some time."  Without it, the vm will fail with early

   // merlin builds.

   if (CheckAssertionStatusDirectives && JDK_Version::is_gte_jdk14x_version()) {

     const char* nm = "java/lang/AssertionStatusDirectives";

     const char* sig = "[Ljava/lang/String;";

     CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classes, sig);

     CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, classEnabled, "[Z");

     CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packages, sig);

     CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, packageEnabled, "[Z");

     CHECK_OFFSET(nm, java_lang_AssertionStatusDirectives, deflt, "Z");

   }

   if (!valid) vm_exit_during_initialization("Hard-coded field offset verification failed");

 }

 #endif // PRODUCT

 void javaClasses_init() {

   JavaClasses::compute_offsets();

   JavaClasses::check_offsets();

   FilteredFieldsMap::initialize();  // must be done after computing offsets.

 }