Mercurial > hg > graal-compiler
view src/share/vm/runtime/fieldType.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 3582bf76420e |
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/* * Copyright (c) 1997, 2010, 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_RUNTIME_FIELDTYPE_HPP #define SHARE_VM_RUNTIME_FIELDTYPE_HPP #include "memory/allocation.hpp" #include "oops/symbolOop.hpp" // Note: FieldType should be based on the SignatureIterator (or vice versa). // In any case, this structure should be re-thought at some point. // A FieldType is used to determine the type of a field from a signature string. class FieldType: public AllStatic { private: static void skip_optional_size(symbolOop signature, int* index); static bool is_valid_array_signature(symbolOop signature); public: // Return basic type static BasicType basic_type(symbolOop signature); // Testing static bool is_array(symbolOop signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); } static bool is_obj(symbolOop signature) { int sig_length = signature->utf8_length(); // Must start with 'L' and end with ';' return (sig_length >= 2 && (signature->byte_at(0) == 'L') && (signature->byte_at(sig_length - 1) == ';')); } // Parse field and extract array information. Works for T_ARRAY only. static BasicType get_array_info(symbolOop signature, jint* dimension, symbolOop *object_key, TRAPS); }; #endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP