jdk8-mips64-public/hotspot: src/share/vm/runtime/unhandledOops.cpp@9f4457a14b58

     1 /*

     2  * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_unhandledOops.cpp.incl"

    28 #ifdef CHECK_UNHANDLED_OOPS

    29 const int free_list_size = 256;

    32 UnhandledOops::UnhandledOops(Thread* thread) {

    33   _thread = thread;

    34   _oop_list = new (ResourceObj::C_HEAP)

    35                     GrowableArray<UnhandledOopEntry>(free_list_size, true);

    36   _level = 0;

    37 }

    39 UnhandledOops::~UnhandledOops() {

    40   delete _oop_list;

    41 }

    44 void UnhandledOops::dump_oops(UnhandledOops *list) {

    45   for (int k = 0; k < list->_oop_list->length(); k++) {

    46     UnhandledOopEntry entry = list->_oop_list->at(k);

    47     tty->print(" " INTPTR_FORMAT, entry._oop_ptr);

    48   }

    49   tty->cr();

    50 }

    52 // For debugging unhandled oop detector _in the debugger_

    53 // You don't want to turn it on in compiled code here.

    54 static bool unhandled_oop_print=0;

    56 void UnhandledOops::register_unhandled_oop(oop* op, address pc) {

    57   if (!_thread->is_in_stack((address)op))

    58     return;

    60   _level ++;

    61   if (unhandled_oop_print) {

    62     for (int i=0; i<_level; i++) tty->print(" ");

    63     tty->print_cr("r " INTPTR_FORMAT, op);

    64   }

    65   UnhandledOopEntry entry(op, pc);

    66   _oop_list->push(entry);

    67 }

    70 bool match_oop_entry(void *op, UnhandledOopEntry e) {

    71   return (e.oop_ptr() == op);

    72 }

    74 // Mark unhandled oop as okay for GC - the containing struct has an oops_do and

    75 // for some reason the oop has to be on the stack.

    76 // May not be called for the current thread, as in the case of

    77 // VM_GetOrSetLocal in jvmti.

    78 void UnhandledOops::allow_unhandled_oop(oop* op) {

    79   assert (CheckUnhandledOops, "should only be called with checking option");

    81   int i = _oop_list->find_at_end(op, match_oop_entry);

    82   assert(i!=-1, "safe for gc oop not in unhandled_oop_list");

    84   UnhandledOopEntry entry = _oop_list->at(i);

    85   assert(!entry._ok_for_gc, "duplicate entry");

    86   entry._ok_for_gc = true;

    87   _oop_list->at_put(i, entry);

    88 }

    91 // Called by the oop destructor to remove unhandled oop from the thread's

    92 // oop list.  All oops given are assumed to be on the list.  If not,

    93 // there's a bug in the unhandled oop detector.

    94 void UnhandledOops::unregister_unhandled_oop(oop* op) {

    95   if (!_thread->is_in_stack((address)op)) return;

    97   _level --;

    98   if (unhandled_oop_print) {

    99     for (int i=0; i<_level; i++) tty->print(" ");

   100     tty->print_cr("u "INTPTR_FORMAT, op);

   101   }

   103   int i = _oop_list->find_at_end(op, match_oop_entry);

   104   assert(i!=-1, "oop not in unhandled_oop_list");

   105   _oop_list->remove_at(i);

   106 }

   108 void UnhandledOops::clear_unhandled_oops() {

   109   assert (CheckUnhandledOops, "should only be called with checking option");

   110   if (_thread->is_gc_locked_out()) {

   111     return;

   112   }

   113   for (int k = 0; k < _oop_list->length(); k++) {

   114     UnhandledOopEntry entry = _oop_list->at(k);

   115     // If an entry is on the unhandled oop list but isn't on the stack

   116     // anymore, it must not have gotten unregistered properly and it's a bug

   117     // in the unhandled oop generator.

   118     if(!_thread->is_in_stack((address)entry._oop_ptr)) {

   119       tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr);

   120       tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,

   121                      (address)_thread, (address)entry._pc);

   122       assert(false, "heap is corrupted by the unhandled oop detector");

   123     }

   124     // Set unhandled oops to a pattern that will crash distinctively

   125     if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;

   126   }

   127 }

   128 #endif // CHECK_UNHANDLED_OOPS

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