author | eosterlund |
Tue, 04 Dec 2018 17:14:11 +0100 | |
changeset 52819 | 022420a4cc63 |
parent 52781 | 436097b038a1 |
child 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#ifndef SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP |
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#define SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP |
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|
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#include "memory/allocation.hpp" |
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#include "oops/oop.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/perfData.hpp" |
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#include "runtime/safepoint.hpp" |
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class nmethod; |
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class DepChange; |
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// |
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// nmethodBucket is used to record dependent nmethods for |
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// deoptimization. nmethod dependencies are actually <klass, method> |
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// pairs but we really only care about the klass part for purposes of |
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// finding nmethods which might need to be deoptimized. Instead of |
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// recording the method, a count of how many times a particular nmethod |
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// was recorded is kept. This ensures that any recording errors are |
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// noticed since an nmethod should be removed as many times are it's |
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// added. |
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// |
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class nmethodBucket: public CHeapObj<mtClass> { |
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friend class VMStructs; |
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private: |
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nmethod* _nmethod; |
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volatile int _count; |
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nmethodBucket* volatile _next; |
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nmethodBucket* volatile _purge_list_next; |
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|
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public: |
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nmethodBucket(nmethod* nmethod, nmethodBucket* next) : |
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_nmethod(nmethod), _count(1), _next(next), _purge_list_next(NULL) {} |
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int count() { return _count; } |
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int increment() { _count += 1; return _count; } |
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int decrement(); |
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nmethodBucket* next(); |
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nmethodBucket* next_not_unloading(); |
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void set_next(nmethodBucket* b); |
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nmethodBucket* purge_list_next(); |
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void set_purge_list_next(nmethodBucket* b); |
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nmethod* get_nmethod() { return _nmethod; } |
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}; |
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// |
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// Utility class to manipulate nmethod dependency context. |
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// Dependency context can be attached either to an InstanceKlass (_dep_context field) |
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// or CallSiteContext oop for call_site_target dependencies (see javaClasses.hpp). |
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// DependencyContext class operates on some location which holds a nmethodBucket* value |
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// and uint64_t integer recording the safepoint counter at the last cleanup. |
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// |
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class DependencyContext : public StackObj { |
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friend class VMStructs; |
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friend class TestDependencyContext; |
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private: |
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nmethodBucket* volatile* _dependency_context_addr; |
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volatile uint64_t* _last_cleanup_addr; |
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|
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bool claim_cleanup(); |
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void set_dependencies(nmethodBucket* b); |
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nmethodBucket* dependencies(); |
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nmethodBucket* dependencies_not_unloading(); |
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|
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static PerfCounter* _perf_total_buckets_allocated_count; |
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static PerfCounter* _perf_total_buckets_deallocated_count; |
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static PerfCounter* _perf_total_buckets_stale_count; |
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static PerfCounter* _perf_total_buckets_stale_acc_count; |
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static nmethodBucket* volatile _purge_list; |
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static uint64_t _cleaning_epoch_monotonic; |
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static volatile uint64_t _cleaning_epoch; |
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|
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public: |
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#ifdef ASSERT |
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// Safepoints are forbidden during DC lifetime. GC can invalidate |
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// _dependency_context_addr if it relocates the holder |
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// (e.g. CallSiteContext Java object). |
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uint64_t _safepoint_counter; |
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|
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DependencyContext(nmethodBucket* volatile* bucket_addr, volatile uint64_t* last_cleanup_addr) |
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: _dependency_context_addr(bucket_addr), |
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_last_cleanup_addr(last_cleanup_addr), |
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_safepoint_counter(SafepointSynchronize::safepoint_counter()) {} |
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~DependencyContext() { |
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assert(_safepoint_counter == SafepointSynchronize::safepoint_counter(), "safepoint happened"); |
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} |
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#else |
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DependencyContext(nmethodBucket* volatile* bucket_addr, volatile uint64_t* last_cleanup_addr) |
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: _dependency_context_addr(bucket_addr), |
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_last_cleanup_addr(last_cleanup_addr) {} |
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#endif // ASSERT |
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static void init(); |
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|
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int mark_dependent_nmethods(DepChange& changes); |
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void add_dependent_nmethod(nmethod* nm); |
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void remove_dependent_nmethod(nmethod* nm); |
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int remove_all_dependents(); |
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void clean_unloading_dependents(); |
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static void purge_dependency_contexts(); |
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static void release(nmethodBucket* b); |
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static void cleaning_start(); |
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static void cleaning_end(); |
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|
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#ifndef PRODUCT |
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void print_dependent_nmethods(bool verbose); |
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bool is_dependent_nmethod(nmethod* nm); |
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#endif //PRODUCT |
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}; |
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#endif // SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP |