Mercurial > hg > graal-compiler
view src/share/vm/oops/oop.pcgc.inline.hpp @ 477:24fda36852ce
6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE
Summary: Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X.
Reviewed-by: acorn, jcoomes
author | coleenp |
---|---|
date | Wed, 10 Dec 2008 15:14:29 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
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/* * Copyright 2005-2008 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. * */ inline void oopDesc::update_contents(ParCompactionManager* cm) { // The klass field must be updated before anything else // can be done. DEBUG_ONLY(klassOopDesc* original_klass = klass()); // Can the option to update and/or copy be moved up in the // call chain to avoid calling into here? if (PSParallelCompact::should_update_klass(klass())) { update_header(); assert(klass()->is_klass(), "Not updated correctly"); } else { assert(klass()->is_klass(), "Not updated"); } Klass* new_klass = blueprint(); if (!new_klass->oop_is_typeArray()) { // It might contain oops beyond the header, so take the virtual call. new_klass->oop_update_pointers(cm, this); } // Else skip it. The typeArrayKlass in the header never needs scavenging. } inline void oopDesc::update_contents(ParCompactionManager* cm, HeapWord* begin_limit, HeapWord* end_limit) { // The klass field must be updated before anything else // can be done. debug_only(klassOopDesc* original_klass = klass()); update_contents(cm, klass(), begin_limit, end_limit); } inline void oopDesc::update_contents(ParCompactionManager* cm, klassOop old_klass, HeapWord* begin_limit, HeapWord* end_limit) { klassOop updated_klass = PSParallelCompact::summary_data().calc_new_klass(old_klass); // Needs to be boundary aware for the 64 bit case // update_header(); // The klass has moved. Is the location of the klass // within the limits? if ((((HeapWord*)&_metadata._klass) >= begin_limit) && (((HeapWord*)&_metadata._klass) < end_limit)) { set_klass(updated_klass); } Klass* klass = updated_klass->klass_part(); if (!klass->oop_is_typeArray()) { // It might contain oops beyond the header, so take the virtual call. klass->oop_update_pointers(cm, this, begin_limit, end_limit); } // Else skip it. The typeArrayKlass in the header never needs scavenging. } inline void oopDesc::follow_contents(ParCompactionManager* cm) { assert (PSParallelCompact::mark_bitmap()->is_marked(this), "should be marked"); blueprint()->oop_follow_contents(cm, this); } // Used by parallel old GC. inline void oopDesc::follow_header(ParCompactionManager* cm) { if (UseCompressedOops) { PSParallelCompact::mark_and_push(cm, compressed_klass_addr()); } else { PSParallelCompact::mark_and_push(cm, klass_addr()); } } inline oop oopDesc::forward_to_atomic(oop p) { assert(ParNewGeneration::is_legal_forward_ptr(p), "illegal forwarding pointer value."); markOop oldMark = mark(); markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p); markOop curMark; assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable"); assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this."); while (!is_forwarded()) { curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark); if (curMark == oldMark) { assert(is_forwarded(), "the CAS should have succeeded."); return NULL; } oldMark = curMark; } return forwardee(); } inline void oopDesc::update_header() { if (UseCompressedOops) { PSParallelCompact::adjust_pointer(compressed_klass_addr()); } else { PSParallelCompact::adjust_pointer(klass_addr()); } } inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) { if (UseCompressedOops) { PSParallelCompact::adjust_pointer(compressed_klass_addr(), beg_addr, end_addr); } else { PSParallelCompact::adjust_pointer(klass_addr(), beg_addr, end_addr); } }