Mercurial > hg > truffle
diff src/share/vm/runtime/unhandledOops.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/unhandledOops.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,128 @@ +/* + * Copyright 2005 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/_unhandledOops.cpp.incl" + +#ifdef CHECK_UNHANDLED_OOPS +const int free_list_size = 256; + + +UnhandledOops::UnhandledOops(Thread* thread) { + _thread = thread; + _oop_list = new (ResourceObj::C_HEAP) + GrowableArray<UnhandledOopEntry>(free_list_size, true); + _level = 0; +} + +UnhandledOops::~UnhandledOops() { + delete _oop_list; +} + + +void UnhandledOops::dump_oops(UnhandledOops *list) { + for (int k = 0; k < list->_oop_list->length(); k++) { + UnhandledOopEntry entry = list->_oop_list->at(k); + tty->print(" " INTPTR_FORMAT, entry._oop_ptr); + } + tty->cr(); +} + +// For debugging unhandled oop detector _in the debugger_ +// You don't want to turn it on in compiled code here. +static bool unhandled_oop_print=0; + +void UnhandledOops::register_unhandled_oop(oop* op, address pc) { + if (!_thread->is_in_stack((address)op)) + return; + + _level ++; + if (unhandled_oop_print) { + for (int i=0; i<_level; i++) tty->print(" "); + tty->print_cr("r " INTPTR_FORMAT, op); + } + UnhandledOopEntry entry(op, pc); + _oop_list->push(entry); +} + + +bool match_oop_entry(void *op, UnhandledOopEntry e) { + return (e.oop_ptr() == op); +} + +// Mark unhandled oop as okay for GC - the containing struct has an oops_do and +// for some reason the oop has to be on the stack. +// May not be called for the current thread, as in the case of +// VM_GetOrSetLocal in jvmti. +void UnhandledOops::allow_unhandled_oop(oop* op) { + assert (CheckUnhandledOops, "should only be called with checking option"); + + int i = _oop_list->find_at_end(op, match_oop_entry); + assert(i!=-1, "safe for gc oop not in unhandled_oop_list"); + + UnhandledOopEntry entry = _oop_list->at(i); + assert(!entry._ok_for_gc, "duplicate entry"); + entry._ok_for_gc = true; + _oop_list->at_put(i, entry); +} + + +// Called by the oop destructor to remove unhandled oop from the thread's +// oop list. All oops given are assumed to be on the list. If not, +// there's a bug in the unhandled oop detector. +void UnhandledOops::unregister_unhandled_oop(oop* op) { + if (!_thread->is_in_stack((address)op)) return; + + _level --; + if (unhandled_oop_print) { + for (int i=0; i<_level; i++) tty->print(" "); + tty->print_cr("u "INTPTR_FORMAT, op); + } + + int i = _oop_list->find_at_end(op, match_oop_entry); + assert(i!=-1, "oop not in unhandled_oop_list"); + _oop_list->remove_at(i); +} + +void UnhandledOops::clear_unhandled_oops() { + assert (CheckUnhandledOops, "should only be called with checking option"); + if (_thread->is_gc_locked_out()) { + return; + } + for (int k = 0; k < _oop_list->length(); k++) { + UnhandledOopEntry entry = _oop_list->at(k); + // If an entry is on the unhandled oop list but isn't on the stack + // anymore, it must not have gotten unregistered properly and it's a bug + // in the unhandled oop generator. + if(!_thread->is_in_stack((address)entry._oop_ptr)) { + tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr); + tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT, + (address)_thread, (address)entry._pc); + assert(false, "heap is corrupted by the unhandled oop detector"); + } + // Set unhandled oops to a pattern that will crash distinctively + if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR; + } +} +#endif // CHECK_UNHANDLED_OOPS