1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/vm/code/compressedStream.hpp Wed Apr 27 01:25:04 2016 +0800 1.3 @@ -0,0 +1,127 @@ 1.4 +/* 1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. 1.11 + * 1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.15 + * version 2 for more details (a copy is included in the LICENSE file that 1.16 + * accompanied this code). 1.17 + * 1.18 + * You should have received a copy of the GNU General Public License version 1.19 + * 2 along with this work; if not, write to the Free Software Foundation, 1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.21 + * 1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.23 + * or visit www.oracle.com if you need additional information or have any 1.24 + * questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +#ifndef SHARE_VM_CODE_COMPRESSEDSTREAM_HPP 1.29 +#define SHARE_VM_CODE_COMPRESSEDSTREAM_HPP 1.30 + 1.31 +#include "memory/allocation.hpp" 1.32 + 1.33 +// Simple interface for filing out and filing in basic types 1.34 +// Used for writing out and reading in debugging information. 1.35 + 1.36 +class CompressedStream : public ResourceObj { 1.37 + friend class VMStructs; 1.38 + protected: 1.39 + u_char* _buffer; 1.40 + int _position; 1.41 + 1.42 + enum { 1.43 + // Constants for UNSIGNED5 coding of Pack200 1.44 + lg_H = 6, H = 1<<lg_H, // number of high codes (64) 1.45 + L = (1<<BitsPerByte)-H, // number of low codes (192) 1.46 + MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes 1.47 + }; 1.48 + 1.49 + // these inlines are defined only in compressedStream.cpp 1.50 + static inline juint encode_sign(jint value); // for Pack200 SIGNED5 1.51 + static inline jint decode_sign(juint value); // for Pack200 SIGNED5 1.52 + static inline juint reverse_int(juint bits); // to trim trailing float 0's 1.53 + 1.54 + public: 1.55 + CompressedStream(u_char* buffer, int position = 0) { 1.56 + _buffer = buffer; 1.57 + _position = position; 1.58 + } 1.59 + 1.60 + u_char* buffer() const { return _buffer; } 1.61 + 1.62 + // Positioning 1.63 + int position() const { return _position; } 1.64 + void set_position(int position) { _position = position; } 1.65 +}; 1.66 + 1.67 + 1.68 +class CompressedReadStream : public CompressedStream { 1.69 + private: 1.70 + inline u_char read() { return _buffer[_position++]; } 1.71 + 1.72 + jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases 1.73 + 1.74 + public: 1.75 + CompressedReadStream(u_char* buffer, int position = 0) 1.76 + : CompressedStream(buffer, position) {} 1.77 + 1.78 + jboolean read_bool() { return (jboolean) read(); } 1.79 + jbyte read_byte() { return (jbyte ) read(); } 1.80 + jchar read_char() { return (jchar ) read_int(); } 1.81 + jshort read_short() { return (jshort ) read_signed_int(); } 1.82 + jint read_int() { jint b0 = read(); 1.83 + if (b0 < L) return b0; 1.84 + else return read_int_mb(b0); 1.85 + } 1.86 + jint read_signed_int(); 1.87 + jfloat read_float(); // jfloat_cast(reverse_int(read_int())) 1.88 + jdouble read_double(); // jdouble_cast(2*reverse_int(read_int)) 1.89 + jlong read_long(); // jlong_from(2*read_signed_int()) 1.90 +}; 1.91 + 1.92 + 1.93 +class CompressedWriteStream : public CompressedStream { 1.94 + private: 1.95 + bool full() { 1.96 + return _position >= _size; 1.97 + } 1.98 + void store(u_char b) { 1.99 + _buffer[_position++] = b; 1.100 + } 1.101 + void write(u_char b) { 1.102 + if (full()) grow(); 1.103 + store(b); 1.104 + } 1.105 + void grow(); 1.106 + 1.107 + void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases 1.108 + 1.109 + protected: 1.110 + int _size; 1.111 + 1.112 + public: 1.113 + CompressedWriteStream(int initial_size); 1.114 + CompressedWriteStream(u_char* buffer, int initial_size, int position = 0) 1.115 + : CompressedStream(buffer, position) { _size = initial_size; } 1.116 + 1.117 + void write_bool(jboolean value) { write(value); } 1.118 + void write_byte(jbyte value) { write(value); } 1.119 + void write_char(jchar value) { write_int(value); } 1.120 + void write_short(jshort value) { write_signed_int(value); } 1.121 + void write_int(jint value) { if ((juint)value < L && !full()) 1.122 + store((u_char)value); 1.123 + else write_int_mb(value); } 1.124 + void write_signed_int(jint value); // write_int(encode_sign(value)) 1.125 + void write_float(jfloat value); // write_int(reverse_int(jint_cast(v))) 1.126 + void write_double(jdouble value); // write_int(reverse_int(<low,high>)) 1.127 + void write_long(jlong value); // write_signed_int(<low,high>) 1.128 +}; 1.129 + 1.130 +#endif // SHARE_VM_CODE_COMPRESSEDSTREAM_HPP