Mercurial > hg > graal-compiler
view src/share/vm/oops/markOop.inline.hpp @ 490:dd70dd4c91de
6782820: Server VM fails with "unhandled implicit exception in compiled code"
Summary: Restore the code which sets a control edge for a klass load node.
Reviewed-by: never
author | kvn |
---|---|
date | Tue, 16 Dec 2008 12:23:39 -0800 |
parents | 37f87013dfd8 |
children | c18cbe5936b8 |
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/* * Copyright 2006 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. * */ // 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(); }