Mercurial > hg > truffle
annotate src/share/vm/code/compressedStream.hpp @ 3763:e66f38dd58a9
Merge
author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CODE_COMPRESSEDSTREAM_HPP |
26 #define SHARE_VM_CODE_COMPRESSEDSTREAM_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 | |
0 | 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 }; | |
1972 | 126 |
127 #endif // SHARE_VM_CODE_COMPRESSEDSTREAM_HPP |