1 /* 2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP 26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP 27 28 #include "oops/oop.hpp" 29 #include "utilities/macros.hpp" 30 31 // A CompiledICHolder* is a helper object for the inline cache implementation. 32 // It holds an intermediate value (method+klass pair) used when converting from 33 // compiled to an interpreted call. 34 // 35 // These are always allocated in the C heap and are freed during a 36 // safepoint by the ICBuffer logic. It's unsafe to free them earlier 37 // since they might be in use. 38 // 39 40 41 class CompiledICHolder : public CHeapObj<mtCompiler> { 42 friend class VMStructs; 43 private: 44 static volatile int _live_count; // allocated 45 static volatile int _live_not_claimed_count; // allocated but not yet in use so not 46 // reachable by iterating over nmethods 47 48 Method* _holder_method; 49 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass 50 CompiledICHolder* _next; 51 52 public: 53 // Constructor 54 CompiledICHolder(Method* method, Klass* klass); 55 ~CompiledICHolder() NOT_DEBUG_RETURN; 56 57 static int live_count() { return _live_count; } 58 static int live_not_claimed_count() { return _live_not_claimed_count; } 59 60 // accessors 61 Method* holder_method() const { return _holder_method; } 62 Klass* holder_klass() const { return _holder_klass; } 63 64 void set_holder_method(Method* m) { _holder_method = m; } 65 void set_holder_klass(Klass* k) { _holder_klass = k; } 66 67 // interpreter support (offsets in bytes) 68 static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); } 69 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); } 70 71 CompiledICHolder* next() { return _next; } 72 void set_next(CompiledICHolder* n) { _next = n; } 73 74 // Verify 75 void verify_on(outputStream* st); 76 77 // Printing 78 void print_on(outputStream* st) const; 79 void print_value_on(outputStream* st) const; 80 81 const char* internal_name() const { return "{compiledICHolder}"; } 82 83 void claim() NOT_DEBUG_RETURN; 84 }; 85 86 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP