hotspot/src/share/vm/runtime/sweeper.hpp
author jrose
Wed, 09 Jun 2010 18:50:45 -0700
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child 5895 7127e98012e3
permissions -rw-r--r--
6939203: JSR 292 needs method handle constants Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode. Reviewed-by: twisti, never
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/*
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 * Copyright (c) 1997, 2005, 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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// An NmethodSweeper is an incremental cleaner for:
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//    - cleanup inline caches
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//    - reclamation of unreferences zombie nmethods
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//
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class NMethodSweeper : public AllStatic {
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  static long      _traversals;   // Stack traversal count
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  static CodeBlob* _current;      // Current nmethod
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  static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache
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  static int       _invocations;  // No. of invocations left until we are completed with this pass
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  static bool      _rescan;          // Indicates that we should do a full rescan of the
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                                     // of the code cache looking for work to do.
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  static bool      _do_sweep;        // Flag to skip the conc sweep if no stack scan happened
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  static jint      _sweep_started;   // Flag to control conc sweeper
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  static int       _locked_seen;     // Number of locked nmethods encountered during the scan
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  static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
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  static bool      _was_full;        // remember if we did emergency unloading
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  static jint      _advise_to_sweep; // flag to indicate code cache getting full
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  static jlong     _last_was_full;   // timestamp of last emergency unloading
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  static uint      _highest_marked;   // highest compile id dumped at last emergency unloading
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  static long      _was_full_traversal;   // trav number at last emergency unloading
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  static void process_nmethod(nmethod *nm);
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 public:
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  static long traversal_count() { return _traversals; }
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  static void scan_stacks();      // Invoked at the end of each safepoint
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  static void sweep_code_cache(); // Concurrent part of sweep job
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  static void possibly_sweep();   // Compiler threads call this to sweep
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  static void notify(nmethod* nm) {
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    // Perform a full scan of the code cache from the beginning.  No
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    // need to synchronize the setting of this flag since it only
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    // changes to false at safepoint so we can never overwrite it with false.
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     _rescan = true;
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  }
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  static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
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  static void speculative_disconnect_nmethods(bool was_full);   // Called by vm op to deal with alloc failure
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  static void set_was_full(bool state) { _was_full = state; }
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  static bool was_full() { return _was_full; }
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};