src/share/vm/prims/whitebox.cpp
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src/share/vm/prims/whitebox.cpp

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   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  *


1385     Symbol* signature_symbol) {
1386   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1387   Thread* THREAD = Thread::current();
1388 
1389   //Get the class of our object
1390   Klass* arg_klass = object->klass();
1391   //Turn it into an instance-klass
1392   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1393 
1394   //Create symbols to look for in the class
1395   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1396       THREAD);
1397 
1398   //To be filled in with an offset of the field we're looking for
1399   fieldDescriptor fd;
1400 
1401   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1402   if (res == NULL) {
1403     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1404         name_symbol->as_C_string());
1405     vm_exit_during_initialization("Invalid layout of preloaded class: use -XX:+TraceClassLoading to see the origin of the problem class");
1406   }
1407 
1408   //fetch the field at the offset we've found
1409   int dest_offset = fd.offset();
1410 
1411   return dest_offset;
1412 }
1413 
1414 
1415 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1416   int offset = offset_for_field(field_name, object,
1417       vmSymbols::string_signature());
1418   oop string = object->obj_field(offset);
1419   if (string == NULL) {
1420     return NULL;
1421   }
1422   const char* ret = java_lang_String::as_utf8_string(string);
1423   return ret;
1424 }
1425 


   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  *


1385     Symbol* signature_symbol) {
1386   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1387   Thread* THREAD = Thread::current();
1388 
1389   //Get the class of our object
1390   Klass* arg_klass = object->klass();
1391   //Turn it into an instance-klass
1392   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1393 
1394   //Create symbols to look for in the class
1395   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1396       THREAD);
1397 
1398   //To be filled in with an offset of the field we're looking for
1399   fieldDescriptor fd;
1400 
1401   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1402   if (res == NULL) {
1403     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1404         name_symbol->as_C_string());
1405     vm_exit_during_initialization("Invalid layout of preloaded class: use -Xlog:classload=info to see the origin of the problem class");
1406   }
1407 
1408   //fetch the field at the offset we've found
1409   int dest_offset = fd.offset();
1410 
1411   return dest_offset;
1412 }
1413 
1414 
1415 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1416   int offset = offset_for_field(field_name, object,
1417       vmSymbols::string_signature());
1418   oop string = object->obj_field(offset);
1419   if (string == NULL) {
1420     return NULL;
1421   }
1422   const char* ret = java_lang_String::as_utf8_string(string);
1423   return ret;
1424 }
1425 


src/share/vm/prims/whitebox.cpp
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