1 /*
   2  * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *

1390     Symbol* signature_symbol) {
1391   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1392   Thread* THREAD = Thread::current();
1393 
1394   //Get the class of our object
1395   Klass* arg_klass = object->klass();
1396   //Turn it into an instance-klass
1397   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1398 
1399   //Create symbols to look for in the class
1400   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1401       THREAD);
1402 
1403   //To be filled in with an offset of the field we're looking for
1404   fieldDescriptor fd;
1405 
1406   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1407   if (res == NULL) {
1408     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1409         name_symbol->as_C_string());
1410     vm_exit_during_initialization("Invalid layout of preloaded class: use -XX:+TraceClassLoading to see the origin of the problem class");
1411   }
1412 
1413   //fetch the field at the offset we've found
1414   int dest_offset = fd.offset();
1415 
1416   return dest_offset;
1417 }
1418 
1419 
1420 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1421   int offset = offset_for_field(field_name, object,
1422       vmSymbols::string_signature());
1423   oop string = object->obj_field(offset);
1424   if (string == NULL) {
1425     return NULL;
1426   }
1427   const char* ret = java_lang_String::as_utf8_string(string);
1428   return ret;
1429 }
1430 

   1 /*
   2  * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *

1390     Symbol* signature_symbol) {
1391   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1392   Thread* THREAD = Thread::current();
1393 
1394   //Get the class of our object
1395   Klass* arg_klass = object->klass();
1396   //Turn it into an instance-klass
1397   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1398 
1399   //Create symbols to look for in the class
1400   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1401       THREAD);
1402 
1403   //To be filled in with an offset of the field we're looking for
1404   fieldDescriptor fd;
1405 
1406   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1407   if (res == NULL) {
1408     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1409         name_symbol->as_C_string());
1410     vm_exit_during_initialization("Invalid layout of preloaded class: use -Xlog:classload=info to see the origin of the problem class");
1411   }
1412 
1413   //fetch the field at the offset we've found
1414   int dest_offset = fd.offset();
1415 
1416   return dest_offset;
1417 }
1418 
1419 
1420 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1421   int offset = offset_for_field(field_name, object,
1422       vmSymbols::string_signature());
1423   oop string = object->obj_field(offset);
1424   if (string == NULL) {
1425     return NULL;
1426   }
1427   const char* ret = java_lang_String::as_utf8_string(string);
1428   return ret;
1429 }
1430