Mercurial > hg > graal-jvmci-8
view src/share/vm/oops/markOop.inline.hpp @ 1877:a4c7fe54bf3f
6991315: RedefineClasses fails with java.lang.VerifyError
Summary: Repair stackmap table attribute when relocating bytecode
Reviewed-by: acorn, never
author | kamg |
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date | Thu, 21 Oct 2010 10:10:23 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2006, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ // Should this header be preserved during GC? inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const { assert(UseBiasedLocking, "unexpected"); if (has_bias_pattern()) { // Will reset bias at end of collection // Mark words of biased and currently locked objects are preserved separately return false; } markOop prototype_header = prototype_for_object(obj_containing_mark); if (prototype_header->has_bias_pattern()) { // Individual instance which has its bias revoked; must return // true for correctness return true; } return (!is_unlocked() || !has_no_hash()); } inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const { if (!UseBiasedLocking) return (!is_unlocked() || !has_no_hash()); return must_be_preserved_with_bias(obj_containing_mark); } // Should this header (including its age bits) be preserved in the // case of a promotion failure during scavenge? inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const { assert(UseBiasedLocking, "unexpected"); // We don't explicitly save off the mark words of biased and // currently-locked objects during scavenges, so if during a // promotion failure we encounter either a biased mark word or a // klass which still has a biasable prototype header, we have to // preserve the mark word. This results in oversaving, but promotion // failures are rare, and this avoids adding more complex logic to // the scavengers to call new variants of // BiasedLocking::preserve_marks() / restore_marks() in the middle // of a scavenge when a promotion failure has first been detected. if (has_bias_pattern() || prototype_for_object(obj_containing_mark)->has_bias_pattern()) { return true; } return (this != prototype()); } inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const { if (!UseBiasedLocking) return (this != prototype()); return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark); } // Should this header (including its age bits) be preserved in the // case of a scavenge in which CMS is the old generation? inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const { assert(UseBiasedLocking, "unexpected"); // CMS scavenges preserve mark words in similar fashion to promotion failures; see above if (has_bias_pattern() || klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) { return true; } return (this != prototype()); } inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const { if (!UseBiasedLocking) return (this != prototype()); return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark); } inline markOop markOopDesc::prototype_for_object(oop obj) { #ifdef ASSERT markOop prototype_header = obj->klass()->klass_part()->prototype_header(); assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header"); #endif return obj->klass()->klass_part()->prototype_header(); }