Mercurial > hg > graal-jvmci-8
annotate src/share/vm/code/compressedStream.hpp @ 1663:7139e81efd2d
6970566: runThese fails with SIGSEGV
Reviewed-by: kvn
author | never |
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date | Thu, 22 Jul 2010 15:29:22 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 1997, 2005, 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 |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
25 // Simple interface for filing out and filing in basic types | |
26 // Used for writing out and reading in debugging information. | |
27 | |
28 class CompressedStream : public ResourceObj { | |
29 friend class VMStructs; | |
30 protected: | |
31 u_char* _buffer; | |
32 int _position; | |
33 | |
34 enum { | |
35 // Constants for UNSIGNED5 coding of Pack200 | |
36 lg_H = 6, H = 1<<lg_H, // number of high codes (64) | |
37 L = (1<<BitsPerByte)-H, // number of low codes (192) | |
38 MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes | |
39 }; | |
40 | |
41 // these inlines are defined only in compressedStream.cpp | |
42 static inline juint encode_sign(jint value); // for Pack200 SIGNED5 | |
43 static inline jint decode_sign(juint value); // for Pack200 SIGNED5 | |
44 static inline juint reverse_int(juint bits); // to trim trailing float 0's | |
45 | |
46 public: | |
47 CompressedStream(u_char* buffer, int position = 0) { | |
48 _buffer = buffer; | |
49 _position = position; | |
50 } | |
51 | |
52 u_char* buffer() const { return _buffer; } | |
53 | |
54 // Positioning | |
55 int position() const { return _position; } | |
56 void set_position(int position) { _position = position; } | |
57 }; | |
58 | |
59 | |
60 class CompressedReadStream : public CompressedStream { | |
61 private: | |
62 inline u_char read() { return _buffer[_position++]; } | |
63 | |
64 jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases | |
65 | |
66 public: | |
67 CompressedReadStream(u_char* buffer, int position = 0) | |
68 : CompressedStream(buffer, position) {} | |
69 | |
70 jboolean read_bool() { return (jboolean) read(); } | |
71 jbyte read_byte() { return (jbyte ) read(); } | |
72 jchar read_char() { return (jchar ) read_int(); } | |
73 jshort read_short() { return (jshort ) read_signed_int(); } | |
74 jint read_int() { jint b0 = read(); | |
75 if (b0 < L) return b0; | |
76 else return read_int_mb(b0); | |
77 } | |
78 jint read_signed_int(); | |
79 jfloat read_float(); // jfloat_cast(reverse_int(read_int())) | |
80 jdouble read_double(); // jdouble_cast(2*reverse_int(read_int)) | |
81 jlong read_long(); // jlong_from(2*read_signed_int()) | |
82 }; | |
83 | |
84 | |
85 class CompressedWriteStream : public CompressedStream { | |
86 private: | |
87 bool full() { | |
88 return _position >= _size; | |
89 } | |
90 void store(u_char b) { | |
91 _buffer[_position++] = b; | |
92 } | |
93 void write(u_char b) { | |
94 if (full()) grow(); | |
95 store(b); | |
96 } | |
97 void grow(); | |
98 | |
99 void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases | |
100 | |
101 protected: | |
102 int _size; | |
103 | |
104 public: | |
105 CompressedWriteStream(int initial_size); | |
106 CompressedWriteStream(u_char* buffer, int initial_size, int position = 0) | |
107 : CompressedStream(buffer, position) { _size = initial_size; } | |
108 | |
109 void write_bool(jboolean value) { write(value); } | |
110 void write_byte(jbyte value) { write(value); } | |
111 void write_char(jchar value) { write_int(value); } | |
112 void write_short(jshort value) { write_signed_int(value); } | |
113 void write_int(jint value) { if ((juint)value < L && !full()) | |
114 store((u_char)value); | |
115 else write_int_mb(value); } | |
116 void write_signed_int(jint value); // write_int(encode_sign(value)) | |
117 void write_float(jfloat value); // write_int(reverse_int(jint_cast(v))) | |
118 void write_double(jdouble value); // write_int(reverse_int(<low,high>)) | |
119 void write_long(jlong value); // write_signed_int(<low,high>) | |
120 }; |