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src/share/vm/runtime/unhandledOops.cpp@c18cbe5936b8 (annotated)

src/share/vm/runtime/unhandledOops.cpp

Thu, 27 May 2010 19:08:38 -0700

author

trims

date

Thu, 27 May 2010 19:08:38 -0700

changeset 1907

c18cbe5936b8

parent 435

a61af66fc99e

child 2314

f95d63e2154a

permissions

-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435	1	/*
trims@1907	2	* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_unhandledOops.cpp.incl"
duke@435	27
duke@435	28	#ifdef CHECK_UNHANDLED_OOPS
duke@435	29	const int free_list_size = 256;
duke@435	30
duke@435	31
duke@435	32	UnhandledOops::UnhandledOops(Thread* thread) {
duke@435	33	_thread = thread;
duke@435	34	_oop_list = new (ResourceObj::C_HEAP)
duke@435	35	GrowableArray<UnhandledOopEntry>(free_list_size, true);
duke@435	36	_level = 0;
duke@435	37	}
duke@435	38
duke@435	39	UnhandledOops::~UnhandledOops() {
duke@435	40	delete _oop_list;
duke@435	41	}
duke@435	42
duke@435	43
duke@435	44	void UnhandledOops::dump_oops(UnhandledOops *list) {
duke@435	45	for (int k = 0; k < list->_oop_list->length(); k++) {
duke@435	46	UnhandledOopEntry entry = list->_oop_list->at(k);
duke@435	47	tty->print(" " INTPTR_FORMAT, entry._oop_ptr);
duke@435	48	}
duke@435	49	tty->cr();
duke@435	50	}
duke@435	51
duke@435	52	// For debugging unhandled oop detector _in the debugger_
duke@435	53	// You don't want to turn it on in compiled code here.
duke@435	54	static bool unhandled_oop_print=0;
duke@435	55
duke@435	56	void UnhandledOops::register_unhandled_oop(oop* op, address pc) {
duke@435	57	if (!_thread->is_in_stack((address)op))
duke@435	58	return;
duke@435	59
duke@435	60	_level ++;
duke@435	61	if (unhandled_oop_print) {
duke@435	62	for (int i=0; i<_level; i++) tty->print(" ");
duke@435	63	tty->print_cr("r " INTPTR_FORMAT, op);
duke@435	64	}
duke@435	65	UnhandledOopEntry entry(op, pc);
duke@435	66	_oop_list->push(entry);
duke@435	67	}
duke@435	68
duke@435	69
duke@435	70	bool match_oop_entry(void *op, UnhandledOopEntry e) {
duke@435	71	return (e.oop_ptr() == op);
duke@435	72	}
duke@435	73
duke@435	74	// Mark unhandled oop as okay for GC - the containing struct has an oops_do and
duke@435	75	// for some reason the oop has to be on the stack.
duke@435	76	// May not be called for the current thread, as in the case of
duke@435	77	// VM_GetOrSetLocal in jvmti.
duke@435	78	void UnhandledOops::allow_unhandled_oop(oop* op) {
duke@435	79	assert (CheckUnhandledOops, "should only be called with checking option");
duke@435	80
duke@435	81	int i = _oop_list->find_at_end(op, match_oop_entry);
duke@435	82	assert(i!=-1, "safe for gc oop not in unhandled_oop_list");
duke@435	83
duke@435	84	UnhandledOopEntry entry = _oop_list->at(i);
duke@435	85	assert(!entry._ok_for_gc, "duplicate entry");
duke@435	86	entry._ok_for_gc = true;
duke@435	87	_oop_list->at_put(i, entry);
duke@435	88	}
duke@435	89
duke@435	90
duke@435	91	// Called by the oop destructor to remove unhandled oop from the thread's
duke@435	92	// oop list. All oops given are assumed to be on the list. If not,
duke@435	93	// there's a bug in the unhandled oop detector.
duke@435	94	void UnhandledOops::unregister_unhandled_oop(oop* op) {
duke@435	95	if (!_thread->is_in_stack((address)op)) return;
duke@435	96
duke@435	97	_level --;
duke@435	98	if (unhandled_oop_print) {
duke@435	99	for (int i=0; i<_level; i++) tty->print(" ");
duke@435	100	tty->print_cr("u "INTPTR_FORMAT, op);
duke@435	101	}
duke@435	102
duke@435	103	int i = _oop_list->find_at_end(op, match_oop_entry);
duke@435	104	assert(i!=-1, "oop not in unhandled_oop_list");
duke@435	105	_oop_list->remove_at(i);
duke@435	106	}
duke@435	107
duke@435	108	void UnhandledOops::clear_unhandled_oops() {
duke@435	109	assert (CheckUnhandledOops, "should only be called with checking option");
duke@435	110	if (_thread->is_gc_locked_out()) {
duke@435	111	return;
duke@435	112	}
duke@435	113	for (int k = 0; k < _oop_list->length(); k++) {
duke@435	114	UnhandledOopEntry entry = _oop_list->at(k);
duke@435	115	// If an entry is on the unhandled oop list but isn't on the stack
duke@435	116	// anymore, it must not have gotten unregistered properly and it's a bug
duke@435	117	// in the unhandled oop generator.
duke@435	118	if(!_thread->is_in_stack((address)entry._oop_ptr)) {
duke@435	119	tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr);
duke@435	120	tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,
duke@435	121	(address)_thread, (address)entry._pc);
duke@435	122	assert(false, "heap is corrupted by the unhandled oop detector");
duke@435	123	}
duke@435	124	// Set unhandled oops to a pattern that will crash distinctively
duke@435	125	if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;
duke@435	126	}
duke@435	127	}
duke@435	128	#endif // CHECK_UNHANDLED_OOPS