src/hotspot/share/code/dependencyContext.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 42055 hotspot/src/share/vm/code/dependencyContext.hpp@98554e5a088e
child 51333 f6641fcf7b7e
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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 * Copyright (c) 2015, 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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#ifndef SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP
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#define SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP
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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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  int            _count;
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  nmethodBucket* _next;
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 public:
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  nmethodBucket(nmethod* nmethod, nmethodBucket* next) :
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   _nmethod(nmethod), _next(next), _count(1) {}
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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()                   { return _next; }
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  void set_next(nmethodBucket* b)         { _next = 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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// The context consists of nmethodBucket* (a head of a linked list)
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// and a boolean flag (does the list contains stale entries). The structure is
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// encoded as an intptr_t: lower bit is used for the flag. It is possible since
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// nmethodBucket* is aligned - the structure is malloc'ed in C heap.
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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 intptr_t value.
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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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  enum TagBits { _has_stale_entries_bit = 1, _has_stale_entries_mask = 1 };
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  intptr_t* _dependency_context_addr;
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  void set_dependencies(nmethodBucket* b) {
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    assert((intptr_t(b) & _has_stale_entries_mask) == 0, "should be aligned");
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    if (has_stale_entries()) {
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      *_dependency_context_addr = intptr_t(b) | _has_stale_entries_mask;
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    } else {
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      *_dependency_context_addr = intptr_t(b);
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    }
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  }
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  void set_has_stale_entries(bool x) {
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    if (x) {
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      *_dependency_context_addr |= _has_stale_entries_mask;
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    } else {
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      *_dependency_context_addr &= ~_has_stale_entries_mask;
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    }
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  }
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  nmethodBucket* dependencies() {
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    intptr_t value = *_dependency_context_addr;
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    return (nmethodBucket*) (value & ~_has_stale_entries_mask);
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  }
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  bool has_stale_entries() const {
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    intptr_t value = *_dependency_context_addr;
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    return (value & _has_stale_entries_mask) != 0;
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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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 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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  int _safepoint_counter;
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  DependencyContext(intptr_t* addr) : _dependency_context_addr(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(intptr_t* addr) : _dependency_context_addr(addr) {}
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#endif // ASSERT
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  static const intptr_t EMPTY = 0; // dependencies = NULL, has_stale_entries = false
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  static void init();
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  int  mark_dependent_nmethods(DepChange& changes);
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  void add_dependent_nmethod(nmethod* nm, bool expunge_stale_entries = false);
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  void remove_dependent_nmethod(nmethod* nm, bool expunge_stale_entries = false);
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  int  remove_all_dependents();
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  void expunge_stale_entries();
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  // Unsafe deallocation of nmethodBuckets. Used in IK::release_C_heap_structures
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  // to clean up the context possibly containing live entries pointing to unloaded nmethods.
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  void wipe();
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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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  bool find_stale_entries();
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#endif //PRODUCT
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};
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#endif // SHARE_VM_CODE_DEPENDENCYCONTEXT_HPP