Mercurial > hg > graal-jvmci-8
view src/share/vm/classfile/classFileStream.hpp @ 1396:d7f654633cfe
6946040: add intrinsic for short and char reverseBytes
Reviewed-by: never, twisti
Contributed-by: Hiroshi Yamauchi <yamauchi@google.com>
author | never |
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date | Mon, 26 Apr 2010 11:27:21 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 1997-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // 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; } };