jdk8-mips64-public/hotspot: src/share/vm/memory/iterator.cpp@d0aa87f04bd5

8003720: NPG: Method in interpreter stack frame can be deallocated
Summary: Pass down a closure during root scanning to keep the class of the method alive.
Reviewed-by: coleenp, jcoomes

     1 /*

     2  * Copyright (c) 1997, 2012, 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  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "memory/iterator.hpp"

    27 #include "oops/oop.inline.hpp"

    29 void KlassToOopClosure::do_klass(Klass* k) {

    30   k->oops_do(_oop_closure);

    31 }

    33 void CLDToOopClosure::do_cld(ClassLoaderData* cld) {

    34   cld->oops_do(_oop_closure, &_klass_closure, _must_claim_cld);

    35 }

    37 void ObjectToOopClosure::do_object(oop obj) {

    38   obj->oop_iterate(_cl);

    39 }

    41 void VoidClosure::do_void() {

    42   ShouldNotCallThis();

    43 }

    45 MarkingCodeBlobClosure::MarkScope::MarkScope(bool activate)

    46   : _active(activate)

    47 {

    48   if (_active)  nmethod::oops_do_marking_prologue();

    49 }

    51 MarkingCodeBlobClosure::MarkScope::~MarkScope() {

    52   if (_active)  nmethod::oops_do_marking_epilogue();

    53 }

    55 void MarkingCodeBlobClosure::do_code_blob(CodeBlob* cb) {

    56   nmethod* nm = cb->as_nmethod_or_null();

    57   if (nm == NULL)  return;

    58   if (!nm->test_set_oops_do_mark()) {

    59     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, 1st visit\n"));

    60     do_newly_marked_nmethod(nm);

    61   } else {

    62     NOT_PRODUCT(if (TraceScavenge)  nm->print_on(tty, "oops_do, skipped on 2nd visit\n"));

    63   }

    64 }

    66 void CodeBlobToOopClosure::do_newly_marked_nmethod(nmethod* nm) {

    67   nm->oops_do(_cl, /*do_strong_roots_only=*/ true);

    68 }

    70 void CodeBlobToOopClosure::do_code_blob(CodeBlob* cb) {

    71   if (!_do_marking) {

    72     nmethod* nm = cb->as_nmethod_or_null();

    73     NOT_PRODUCT(if (TraceScavenge && Verbose && nm != NULL)  nm->print_on(tty, "oops_do, unmarked visit\n"));

    74     // This assert won't work, since there are lots of mini-passes

    75     // (mostly in debug mode) that co-exist with marking phases.

    76     //assert(!(cb->is_nmethod() && ((nmethod*)cb)->test_oops_do_mark()), "found marked nmethod during mark-free phase");

    77     if (nm != NULL) {

    78       nm->oops_do(_cl);

    79     }

    80   } else {

    81     MarkingCodeBlobClosure::do_code_blob(cb);

    82   }

    83 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/iterator.cpp@d0aa87f04bd5

src/share/vm/memory/iterator.cpp