1 /* 2 * Copyright (c) 2023, 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_OOPS_METHODFLAGS_HPP 26 #define SHARE_OOPS_METHODFLAGS_HPP 27 28 #include "runtime/atomic.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 class outputStream; 33 34 // The MethodFlags class contains the writeable flags aka. status associated with 35 // an Method, and their associated accessors. 36 // _status are set at runtime and require atomic access. 37 // These flags are JVM internal and not part of the AccessFlags classfile specification. 38 39 class MethodFlags { 40 friend class VMStructs; 41 friend class JVMCIVMStructs; 42 /* end of list */ 43 44 #define M_STATUS_DO(status) \ 45 status(has_monitor_bytecodes , 1 << 0) /* Method contains monitorenter/monitorexit bytecodes */ \ 46 status(has_jsrs , 1 << 1) \ 47 status(is_old , 1 << 2) /* RedefineClasses() has replaced this method */ \ 48 status(is_obsolete , 1 << 3) /* RedefineClasses() has made method obsolete */ \ 49 status(is_deleted , 1 << 4) /* RedefineClasses() has deleted this method */ \ 50 status(is_prefixed_native , 1 << 5) /* JVMTI has prefixed this native method */ \ 51 status(monitor_matching , 1 << 6) /* True if we know that monitorenter/monitorexit bytecodes match */ \ 52 status(queued_for_compilation , 1 << 7) \ 53 status(is_not_c2_compilable , 1 << 8) \ 54 status(is_not_c1_compilable , 1 << 9) \ 55 status(is_not_c2_osr_compilable , 1 << 10) \ 56 status(force_inline , 1 << 11) /* Annotations but also set/reset at runtime */ \ 57 status(dont_inline , 1 << 12) \ 58 status(has_loops_flag , 1 << 13) /* Method has loops */ \ 59 status(has_loops_flag_init , 1 << 14) /* The loop flag has been initialized */ \ 60 status(on_stack_flag , 1 << 15) /* RedefineClasses support to keep Metadata from being cleaned */ \ 61 status(has_matching_directives , 1 << 16) /* Temporary mark, used only when methods are to be refreshed to reflect a compiler directives update */ \ 62 /* end of list */ 63 64 #define M_STATUS_ENUM_NAME(name, value) _misc_##name = value, 65 enum { 66 M_STATUS_DO(M_STATUS_ENUM_NAME) 67 }; 68 #undef M_STATUS_ENUM_NAME 69 70 // These flags are written during execution so require atomic stores 71 u4 _status; 72 73 public: 74 75 MethodFlags() : _status(0) {} 76 77 // Create getters and setters for the status values. 78 #define M_STATUS_GET_SET(name, ignore) \ 79 bool name() const { return (_status & _misc_##name) != 0; } \ 80 void set_##name(bool b) { \ 81 if (b) { \ 82 atomic_set_bits(_misc_##name); \ 83 } else { \ 84 atomic_clear_bits(_misc_##name); \ 85 } \ 86 } 87 M_STATUS_DO(M_STATUS_GET_SET) 88 #undef M_STATUS_GET_SET 89 90 int as_int() const { return _status; } 91 void atomic_set_bits(u4 bits) { Atomic::fetch_then_or(&_status, bits); } 92 void atomic_clear_bits(u4 bits) { Atomic::fetch_then_and(&_status, ~bits); } 93 void print_on(outputStream* st) const; 94 }; 95 96 #endif // SHARE_OOPS_METHODFLAGS_HPP