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view src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
author | johnc |
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date | Wed, 18 Aug 2010 10:59:06 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2005, 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. * */ // The VM_CMS_Operation is slightly different from // a VM_GC_Operation -- and would not have subclassed easily // to VM_GC_Operation without several changes to VM_GC_Operation. // To minimize the changes, we have replicated some of the VM_GC_Operation // functionality here. We will consolidate that back by doing subclassing // as appropriate in Dolphin. // // VM_Operation // VM_CMS_Operation // - implements the common portion of work done in support // of CMS' stop-world phases (initial mark and remark). // // VM_CMS_Initial_Mark // VM_CMS_Final_Mark // // Forward decl. class CMSCollector; class VM_CMS_Operation: public VM_Operation { protected: CMSCollector* _collector; // associated collector bool _prologue_succeeded; // whether doit_prologue succeeded bool lost_race() const; // java.lang.ref.Reference support void acquire_pending_list_lock(); void release_and_notify_pending_list_lock(); public: VM_CMS_Operation(CMSCollector* collector): _collector(collector), _prologue_succeeded(false) {} ~VM_CMS_Operation() {} // The legal collector state for executing this CMS op. virtual const CMSCollector::CollectorState legal_state() const = 0; // Whether the pending list lock needs to be held virtual const bool needs_pll() const = 0; // Execute operations in the context of the caller, // prior to execution of the vm operation itself. virtual bool doit_prologue(); // Execute operations in the context of the caller, // following completion of the vm operation. virtual void doit_epilogue(); virtual bool evaluate_at_safepoint() const { return true; } virtual bool is_cheap_allocated() const { return false; } virtual bool allow_nested_vm_operations() const { return false; } bool prologue_succeeded() const { return _prologue_succeeded; } void verify_before_gc(); void verify_after_gc(); }; // VM_CMS_Operation for the initial marking phase of CMS. class VM_CMS_Initial_Mark: public VM_CMS_Operation { public: VM_CMS_Initial_Mark(CMSCollector* _collector) : VM_CMS_Operation(_collector) {} virtual VMOp_Type type() const { return VMOp_CMS_Initial_Mark; } virtual void doit(); virtual const CMSCollector::CollectorState legal_state() const { return CMSCollector::InitialMarking; } virtual const bool needs_pll() const { return false; } }; // VM_CMS_Operation for the final remark phase of CMS. class VM_CMS_Final_Remark: public VM_CMS_Operation { public: VM_CMS_Final_Remark(CMSCollector* _collector) : VM_CMS_Operation(_collector) {} virtual VMOp_Type type() const { return VMOp_CMS_Final_Remark; } virtual void doit(); virtual const CMSCollector::CollectorState legal_state() const { return CMSCollector::FinalMarking; } virtual const bool needs_pll() const { return true; } }; // VM operation to invoke a concurrent collection of the heap as a // GenCollectedHeap heap. class VM_GenCollectFullConcurrent: public VM_GC_Operation { public: VM_GenCollectFullConcurrent(unsigned int gc_count_before, unsigned int full_gc_count_before, GCCause::Cause gc_cause) : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */) { _gc_cause = gc_cause; assert(FullGCCount_lock != NULL, "Error"); assert(UseAsyncConcMarkSweepGC, "Else will hang caller"); } ~VM_GenCollectFullConcurrent() {} virtual VMOp_Type type() const { return VMOp_GenCollectFullConcurrent; } virtual void doit(); virtual void doit_epilogue(); virtual bool is_cheap_allocated() const { return false; } virtual bool evaluate_at_safepoint() const; };