1 /* 2 * Copyright (c) 1998, 2017, 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 30 // A CompiledICHolder* is a helper object for the inline cache implementation. 31 // It holds: 32 // (1) (method+klass pair) when converting from compiled to an interpreted call 33 // (2) (klass+klass pair) when calling itable stub from megamorphic compiled 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 Metadata* _holder_metadata; 49 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass 50 CompiledICHolder* _next; 51 52 public: 53 // Constructor 54 CompiledICHolder(Metadata* metadata, Klass* klass) 55 : _holder_metadata(metadata), _holder_klass(klass) { 56 #ifdef ASSERT 57 Atomic::inc(&_live_count); 58 Atomic::inc(&_live_not_claimed_count); 59 #endif 60 } 61 62 ~CompiledICHolder() { 63 #ifdef ASSERT 64 assert(_live_count > 0, "underflow"); 65 Atomic::dec(&_live_count); 66 #endif 67 } 68 69 static int live_count() { return _live_count; } 70 static int live_not_claimed_count() { return _live_not_claimed_count; } 71 72 // accessors 73 Klass* holder_klass() const { return _holder_klass; } 74 Metadata* holder_metadata() const { return _holder_metadata; } 75 76 void set_holder_metadata(Metadata* m) { _holder_metadata = m; } 77 void set_holder_klass(Klass* k) { _holder_klass = k; } 78 79 static int holder_metadata_offset() { return offset_of(CompiledICHolder, _holder_metadata); } 80 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); } 81 82 CompiledICHolder* next() { return _next; } 83 void set_next(CompiledICHolder* n) { _next = n; } 84 85 bool is_loader_alive(BoolObjectClosure* is_alive); 86 87 // Verify 88 void verify_on(outputStream* st); 89 90 // Printing 91 void print_on(outputStream* st) const; 92 void print_value_on(outputStream* st) const; 93 94 const char* internal_name() const { return "{compiledICHolder}"; } 95 96 void claim() { 97 #ifdef ASSERT 98 Atomic::dec(&_live_not_claimed_count); 99 #endif 100 } 101 }; 102 103 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP | 1 /* 2 * Copyright (c) 1998, 2018, 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 "oops/klass.hpp" 30 #include "oops/method.hpp" 31 32 // A CompiledICHolder* is a helper object for the inline cache implementation. 33 // It holds: 34 // (1) (method+klass pair) when converting from compiled to an interpreted call 35 // (2) (klass+klass pair) when calling itable stub from megamorphic compiled call 36 // 37 // These are always allocated in the C heap and are freed during a 38 // safepoint by the ICBuffer logic. It's unsafe to free them earlier 39 // since they might be in use. 40 // 41 42 43 class CompiledICHolder : public CHeapObj<mtCompiler> { 44 friend class VMStructs; 45 private: 46 static volatile int _live_count; // allocated 47 static volatile int _live_not_claimed_count; // allocated but not yet in use so not 48 // reachable by iterating over nmethods 49 50 Metadata* _holder_metadata; 51 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass 52 CompiledICHolder* _next; 53 bool _is_metadata_method; 54 55 public: 56 // Constructor 57 CompiledICHolder(Metadata* metadata, Klass* klass, bool is_method = true) 58 : _holder_metadata(metadata), _holder_klass(klass), _is_metadata_method(is_method) { 59 #ifdef ASSERT 60 Atomic::inc(&_live_count); 61 Atomic::inc(&_live_not_claimed_count); 62 #endif 63 } 64 65 ~CompiledICHolder() { 66 #ifdef ASSERT 67 assert(_live_count > 0, "underflow"); 68 Atomic::dec(&_live_count); 69 #endif 70 } 71 72 static int live_count() { return _live_count; } 73 static int live_not_claimed_count() { return _live_not_claimed_count; } 74 75 // accessors 76 Klass* holder_klass() const { return _holder_klass; } 77 Metadata* holder_metadata() const { return _holder_metadata; } 78 79 void set_holder_metadata(Metadata* m) { _holder_metadata = m; } 80 void set_holder_klass(Klass* k) { _holder_klass = k; } 81 82 static int holder_metadata_offset() { return offset_of(CompiledICHolder, _holder_metadata); } 83 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); } 84 85 CompiledICHolder* next() { return _next; } 86 void set_next(CompiledICHolder* n) { _next = n; } 87 88 inline bool is_loader_alive(BoolObjectClosure* is_alive) { 89 Klass* k = _is_metadata_method ? ((Method*)_holder_metadata)->method_holder() : (Klass*)_holder_metadata; 90 if (!k->is_loader_alive(is_alive)) { 91 return false; 92 } 93 if (!_holder_klass->is_loader_alive(is_alive)) { 94 return false; 95 } 96 return true; 97 } 98 99 // Verify 100 void verify_on(outputStream* st); 101 102 // Printing 103 void print_on(outputStream* st) const; 104 void print_value_on(outputStream* st) const; 105 106 const char* internal_name() const { return "{compiledICHolder}"; } 107 108 void claim() { 109 #ifdef ASSERT 110 Atomic::dec(&_live_not_claimed_count); 111 #endif 112 } 113 }; 114 115 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP |