1 /*
2 * Copyright (c) 1997, 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 *
173
174 // Number of page sizes efficiently supported by the hardware. Most chips now
175 // support two sizes, thus this default implementation. Processor-specific
176 // subclasses should define new versions to hide this one as needed. Note
177 // that the O/S may support more sizes, but at most this many are used.
178 static uint page_size_count() { return 2; }
179
180 // Denominator for computing default ParallelGCThreads for machines with
181 // a large number of cores.
182 static uint parallel_worker_threads_denominator() { return 8; }
183
184 // Does this CPU support spin wait instruction?
185 static bool supports_on_spin_wait() { return false; }
186
187 // Does platform support fast class initialization checks for static methods?
188 static bool supports_fast_class_init_checks() { return false; }
189
190 // Does platform support stack watermark barriers for concurrent stack processing?
191 constexpr static bool supports_stack_watermark_barrier() { return false; }
192
193 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
194 };
195
196 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP
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1 /*
2 * Copyright (c) 1997, 2024, 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 *
173
174 // Number of page sizes efficiently supported by the hardware. Most chips now
175 // support two sizes, thus this default implementation. Processor-specific
176 // subclasses should define new versions to hide this one as needed. Note
177 // that the O/S may support more sizes, but at most this many are used.
178 static uint page_size_count() { return 2; }
179
180 // Denominator for computing default ParallelGCThreads for machines with
181 // a large number of cores.
182 static uint parallel_worker_threads_denominator() { return 8; }
183
184 // Does this CPU support spin wait instruction?
185 static bool supports_on_spin_wait() { return false; }
186
187 // Does platform support fast class initialization checks for static methods?
188 static bool supports_fast_class_init_checks() { return false; }
189
190 // Does platform support stack watermark barriers for concurrent stack processing?
191 constexpr static bool supports_stack_watermark_barrier() { return false; }
192
193 // Is recursive lightweight locking implemented for this platform?
194 constexpr static bool supports_recursive_lightweight_locking() { return false; }
195
196 static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]);
197 };
198
199 #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP
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