Mercurial > hg > graal-compiler
view src/share/vm/classfile/classFileStream.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 | b92c45f2bc75 |
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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_CLASSFILE_CLASSFILESTREAM_HPP #define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP #include "utilities/top.hpp" #ifdef TARGET_ARCH_x86 # include "bytes_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "bytes_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "bytes_zero.hpp" #endif // Input stream for reading .class file // // The entire input stream is present in a buffer allocated by the caller. // The caller is responsible for deallocating the buffer and for using // ResourceMarks appropriately when constructing streams. class ClassFileStream: public ResourceObj { private: u1* _buffer_start; // Buffer bottom u1* _buffer_end; // Buffer top (one past last element) u1* _current; // Current buffer position char* _source; // Source of stream (directory name, ZIP/JAR archive name) bool _need_verify; // True if verification is on for the class file void truncated_file_error(TRAPS); public: // Constructor ClassFileStream(u1* buffer, int length, char* source); // Buffer access u1* buffer() const { return _buffer_start; } int length() const { return _buffer_end - _buffer_start; } u1* current() const { return _current; } void set_current(u1* pos) { _current = pos; } char* source() const { return _source; } void set_verify(bool flag) { _need_verify = flag; } void check_truncated_file(bool b, TRAPS) { if (b) { truncated_file_error(THREAD); } } void guarantee_more(int size, TRAPS) { size_t remaining = (size_t)(_buffer_end - _current); unsigned int usize = (unsigned int)size; check_truncated_file(usize > remaining, CHECK); } // Read u1 from stream u1 get_u1(TRAPS); u1 get_u1_fast() { return *_current++; } // Read u2 from stream u2 get_u2(TRAPS); u2 get_u2_fast() { u2 res = Bytes::get_Java_u2(_current); _current += 2; return res; } // Read u4 from stream u4 get_u4(TRAPS); u4 get_u4_fast() { u4 res = Bytes::get_Java_u4(_current); _current += 4; return res; } // Read u8 from stream u8 get_u8(TRAPS); u8 get_u8_fast() { u8 res = Bytes::get_Java_u8(_current); _current += 8; return res; } // Get direct pointer into stream at current position. // Returns NULL if length elements are not remaining. The caller is // responsible for calling skip below if buffer contents is used. u1* get_u1_buffer() { return _current; } u2* get_u2_buffer() { return (u2*) _current; } // Skip length u1 or u2 elements from stream void skip_u1(int length, TRAPS); void skip_u1_fast(int length) { _current += length; } void skip_u2(int length, TRAPS); void skip_u2_fast(int length) { _current += 2 * length; } // Tells whether eos is reached bool at_eos() const { return _current == _buffer_end; } }; #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP