1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/compiledICHolder.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,101 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
1.29 +#define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
1.30 +
1.31 +#include "oops/oop.hpp"
1.32 +
1.33 +// A CompiledICHolder* is a helper object for the inline cache implementation.
1.34 +// It holds an intermediate value (method+klass pair) used when converting from
1.35 +// compiled to an interpreted call.
1.36 +//
1.37 +// These are always allocated in the C heap and are freed during a
1.38 +// safepoint by the ICBuffer logic. It's unsafe to free them earlier
1.39 +// since they might be in use.
1.40 +//
1.41 +
1.42 +
1.43 +class CompiledICHolder : public CHeapObj<mtCompiler> {
1.44 + friend class VMStructs;
1.45 + private:
1.46 + static volatile int _live_count; // allocated
1.47 + static volatile int _live_not_claimed_count; // allocated but not yet in use so not
1.48 + // reachable by iterating over nmethods
1.49 +
1.50 + Method* _holder_method;
1.51 + Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass
1.52 + CompiledICHolder* _next;
1.53 +
1.54 + public:
1.55 + // Constructor
1.56 + CompiledICHolder(Method* method, Klass* klass)
1.57 + : _holder_method(method), _holder_klass(klass) {
1.58 +#ifdef ASSERT
1.59 + Atomic::inc(&_live_count);
1.60 + Atomic::inc(&_live_not_claimed_count);
1.61 +#endif
1.62 + }
1.63 +
1.64 + ~CompiledICHolder() {
1.65 +#ifdef ASSERT
1.66 + assert(_live_count > 0, "underflow");
1.67 + Atomic::dec(&_live_count);
1.68 +#endif
1.69 + }
1.70 +
1.71 + static int live_count() { return _live_count; }
1.72 + static int live_not_claimed_count() { return _live_not_claimed_count; }
1.73 +
1.74 + // accessors
1.75 + Method* holder_method() const { return _holder_method; }
1.76 + Klass* holder_klass() const { return _holder_klass; }
1.77 +
1.78 + void set_holder_method(Method* m) { _holder_method = m; }
1.79 + void set_holder_klass(Klass* k) { _holder_klass = k; }
1.80 +
1.81 + // interpreter support (offsets in bytes)
1.82 + static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); }
1.83 + static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); }
1.84 +
1.85 + CompiledICHolder* next() { return _next; }
1.86 + void set_next(CompiledICHolder* n) { _next = n; }
1.87 +
1.88 + // Verify
1.89 + void verify_on(outputStream* st);
1.90 +
1.91 + // Printing
1.92 + void print_on(outputStream* st) const;
1.93 + void print_value_on(outputStream* st) const;
1.94 +
1.95 + const char* internal_name() const { return "{compiledICHolder}"; }
1.96 +
1.97 + void claim() {
1.98 +#ifdef ASSERT
1.99 + Atomic::dec(&_live_not_claimed_count);
1.100 +#endif
1.101 + }
1.102 +};
1.103 +
1.104 +#endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
