hotspot/src/share/vm/oops/compiledICHolder.hpp
author ehelin
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8015107: NPG: Use consistent naming for metaspace concepts Reviewed-by: coleenp, mgerdin, hseigel
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/*
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 * Copyright (c) 1998, 2012, 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_OOPS_COMPILEDICHOLDEROOP_HPP
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#define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
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#include "oops/oop.hpp"
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// A CompiledICHolder* is a helper object for the inline cache implementation.
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// It holds an intermediate value (method+klass pair) used when converting from
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// compiled to an interpreted call.
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//
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// These are always allocated in the C heap and are freed during a
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// safepoint by the ICBuffer logic.  It's unsafe to free them earlier
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// since they might be in use.
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//
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class CompiledICHolder : public CHeapObj<mtCompiler> {
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  friend class VMStructs;
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 private:
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  static volatile int _live_count; // allocated
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  static volatile int _live_not_claimed_count; // allocated but not yet in use so not
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                                               // reachable by iterating over nmethods
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  Method* _holder_method;
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  Klass*    _holder_klass;    // to avoid name conflict with oopDesc::_klass
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  CompiledICHolder* _next;
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 public:
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  // Constructor
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  CompiledICHolder(Method* method, Klass* klass)
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      : _holder_method(method), _holder_klass(klass) {
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#ifdef ASSERT
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    Atomic::inc(&_live_count);
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    Atomic::inc(&_live_not_claimed_count);
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#endif
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  }
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  ~CompiledICHolder() {
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#ifdef ASSERT
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    assert(_live_count > 0, "underflow");
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    Atomic::dec(&_live_count);
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#endif
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  }
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  static int live_count() { return _live_count; }
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  static int live_not_claimed_count() { return _live_not_claimed_count; }
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  // accessors
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  Method* holder_method() const     { return _holder_method; }
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  Klass*    holder_klass()  const     { return _holder_klass; }
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  void set_holder_method(Method* m) { _holder_method = m; }
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  void set_holder_klass(Klass* k)   { _holder_klass = k; }
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  // interpreter support (offsets in bytes)
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  static int holder_method_offset()   { return offset_of(CompiledICHolder, _holder_method); }
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  static int holder_klass_offset()    { return offset_of(CompiledICHolder, _holder_klass); }
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  CompiledICHolder* next()     { return _next; }
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  void set_next(CompiledICHolder* n) { _next = n; }
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  // Verify
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  void verify_on(outputStream* st);
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  // Printing
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  void print_on(outputStream* st) const;
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  void print_value_on(outputStream* st) const;
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  const char* internal_name() const { return "{compiledICHolder}"; }
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  void claim() {
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#ifdef ASSERT
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    Atomic::dec(&_live_not_claimed_count);
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#endif
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  }
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};
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#endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP