Mercurial > hg > truffle
diff src/share/vm/oops/compiledICHolder.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
---|---|
date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/share/vm/oops/compiledICHolderOop.hpp@f95d63e2154a |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/compiledICHolder.hpp Sat Sep 01 13:25:18 2012 -0400 @@ -0,0 +1,101 @@ +/* + * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP +#define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP + +#include "oops/oop.hpp" + +// A CompiledICHolder* is a helper object for the inline cache implementation. +// It holds an intermediate value (method+klass pair) used when converting from +// compiled to an interpreted call. +// +// These are always allocated in the C heap and are freed during a +// safepoint by the ICBuffer logic. It's unsafe to free them earlier +// since they might be in use. +// + + +class CompiledICHolder : public CHeapObj<mtCompiler> { + friend class VMStructs; + private: + static volatile int _live_count; // allocated + static volatile int _live_not_claimed_count; // allocated but not yet in use so not + // reachable by iterating over nmethods + + Method* _holder_method; + Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass + CompiledICHolder* _next; + + public: + // Constructor + CompiledICHolder(Method* method, Klass* klass) + : _holder_method(method), _holder_klass(klass) { +#ifdef ASSERT + Atomic::inc(&_live_count); + Atomic::inc(&_live_not_claimed_count); +#endif + } + + ~CompiledICHolder() { +#ifdef ASSERT + assert(_live_count > 0, "underflow"); + Atomic::dec(&_live_count); +#endif + } + + static int live_count() { return _live_count; } + static int live_not_claimed_count() { return _live_not_claimed_count; } + + // accessors + Method* holder_method() const { return _holder_method; } + Klass* holder_klass() const { return _holder_klass; } + + void set_holder_method(Method* m) { _holder_method = m; } + void set_holder_klass(Klass* k) { _holder_klass = k; } + + // interpreter support (offsets in bytes) + static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); } + static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); } + + CompiledICHolder* next() { return _next; } + void set_next(CompiledICHolder* n) { _next = n; } + + // Verify + void verify_on(outputStream* st); + + // Printing + void print_on(outputStream* st) const; + void print_value_on(outputStream* st) const; + + const char* internal_name() const { return "{compiledICHolder}"; } + + void claim() { +#ifdef ASSERT + Atomic::dec(&_live_not_claimed_count); +#endif + } +}; + +#endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP