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comparison: src/share/vm/code/compressedStream.hpp
src/share/vm/code/compressedStream.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2010, 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 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_CODE_COMPRESSEDSTREAM_HPP | |
| 26 #define SHARE_VM_CODE_COMPRESSEDSTREAM_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 | |
| 30 // Simple interface for filing out and filing in basic types | |
| 31 // Used for writing out and reading in debugging information. | |
| 32 | |
| 33 class CompressedStream : public ResourceObj { | |
| 34 friend class VMStructs; | |
| 35 protected: | |
| 36 u_char* _buffer; | |
| 37 int _position; | |
| 38 | |
| 39 enum { | |
| 40 // Constants for UNSIGNED5 coding of Pack200 | |
| 41 lg_H = 6, H = 1<<lg_H, // number of high codes (64) | |
| 42 L = (1<<BitsPerByte)-H, // number of low codes (192) | |
| 43 MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes | |
| 44 }; | |
| 45 | |
| 46 // these inlines are defined only in compressedStream.cpp | |
| 47 static inline juint encode_sign(jint value); // for Pack200 SIGNED5 | |
| 48 static inline jint decode_sign(juint value); // for Pack200 SIGNED5 | |
| 49 static inline juint reverse_int(juint bits); // to trim trailing float 0's | |
| 50 | |
| 51 public: | |
| 52 CompressedStream(u_char* buffer, int position = 0) { | |
| 53 _buffer = buffer; | |
| 54 _position = position; | |
| 55 } | |
| 56 | |
| 57 u_char* buffer() const { return _buffer; } | |
| 58 | |
| 59 // Positioning | |
| 60 int position() const { return _position; } | |
| 61 void set_position(int position) { _position = position; } | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 class CompressedReadStream : public CompressedStream { | |
| 66 private: | |
| 67 inline u_char read() { return _buffer[_position++]; } | |
| 68 | |
| 69 jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases | |
| 70 | |
| 71 public: | |
| 72 CompressedReadStream(u_char* buffer, int position = 0) | |
| 73 : CompressedStream(buffer, position) {} | |
| 74 | |
| 75 jboolean read_bool() { return (jboolean) read(); } | |
| 76 jbyte read_byte() { return (jbyte ) read(); } | |
| 77 jchar read_char() { return (jchar ) read_int(); } | |
| 78 jshort read_short() { return (jshort ) read_signed_int(); } | |
| 79 jint read_int() { jint b0 = read(); | |
| 80 if (b0 < L) return b0; | |
| 81 else return read_int_mb(b0); | |
| 82 } | |
| 83 jint read_signed_int(); | |
| 84 jfloat read_float(); // jfloat_cast(reverse_int(read_int())) | |
| 85 jdouble read_double(); // jdouble_cast(2*reverse_int(read_int)) | |
| 86 jlong read_long(); // jlong_from(2*read_signed_int()) | |
| 87 }; | |
| 88 | |
| 89 | |
| 90 class CompressedWriteStream : public CompressedStream { | |
| 91 private: | |
| 92 bool full() { | |
| 93 return _position >= _size; | |
| 94 } | |
| 95 void store(u_char b) { | |
| 96 _buffer[_position++] = b; | |
| 97 } | |
| 98 void write(u_char b) { | |
| 99 if (full()) grow(); | |
| 100 store(b); | |
| 101 } | |
| 102 void grow(); | |
| 103 | |
| 104 void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases | |
| 105 | |
| 106 protected: | |
| 107 int _size; | |
| 108 | |
| 109 public: | |
| 110 CompressedWriteStream(int initial_size); | |
| 111 CompressedWriteStream(u_char* buffer, int initial_size, int position = 0) | |
| 112 : CompressedStream(buffer, position) { _size = initial_size; } | |
| 113 | |
| 114 void write_bool(jboolean value) { write(value); } | |
| 115 void write_byte(jbyte value) { write(value); } | |
| 116 void write_char(jchar value) { write_int(value); } | |
| 117 void write_short(jshort value) { write_signed_int(value); } | |
| 118 void write_int(jint value) { if ((juint)value < L && !full()) | |
| 119 store((u_char)value); | |
| 120 else write_int_mb(value); } | |
| 121 void write_signed_int(jint value); // write_int(encode_sign(value)) | |
| 122 void write_float(jfloat value); // write_int(reverse_int(jint_cast(v))) | |
| 123 void write_double(jdouble value); // write_int(reverse_int(<low,high>)) | |
| 124 void write_long(jlong value); // write_signed_int(<low,high>) | |
| 125 }; | |
| 126 | |
| 127 #endif // SHARE_VM_CODE_COMPRESSEDSTREAM_HPP |
