Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/debugger/InputLexer.java @ 11997:cd25d3be91c5
8012144: multiple SIGSEGVs fails on staxf
Summary: Forward port of 7u change to add additional fence() on RMO platforms, with a load_acquire on all platforms
Reviewed-by: dholmes, kvn
author | vladidan |
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date | Tue, 06 Aug 2013 20:01:40 -0400 |
parents | c18cbe5936b8 |
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rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, 2001, 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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6941466: Oracle rebranding changes for Hotspot repositories
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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 package sun.jvm.hotspot.debugger; | |
26 | |
27 import java.io.*; | |
28 | |
29 /** InputLexer is the lexer through which the current set of debuggers | |
30 see the debug server. It provides the ability to read all of the | |
31 types the debuggers are interested in. All read operations are | |
32 blocking. */ | |
33 | |
34 public class InputLexer { | |
35 public InputLexer(BufferedInputStream in) throws IOException { | |
36 this.in = in; | |
37 pushedBack = false; | |
38 } | |
39 | |
40 public void close() throws IOException { | |
41 in.close(); | |
42 } | |
43 | |
44 /** Parses a boolean (really either a 0 or 1 integer in US-ASCII | |
45 encoding) on the input stream */ | |
46 public boolean parseBoolean() throws IOException { | |
47 int val = parseInt(); | |
48 return (val != 0); | |
49 } | |
50 | |
51 /** Parses an int in US-ASCII encoding on the input stream */ | |
52 public int parseInt() throws IOException { | |
53 long l = parseLong(); | |
54 long mask = 0xFFFFFFFF00000000L; | |
55 if ((l & mask) != 0) { | |
56 throw new IOException("Overflow error reading int from debug server (read " + l + ")"); | |
57 } | |
58 return (int) l; | |
59 } | |
60 | |
61 /** Parses a long in US-ASCII encoding on the input stream */ | |
62 public long parseLong() throws IOException { | |
63 skipWhitespace(); | |
64 byte b = readByte(); | |
65 if (!Character.isDigit((char) b)) { | |
66 error(); | |
67 } | |
68 long l = 0; | |
69 while (Character.isDigit((char) b)) { | |
70 l *= 10; | |
71 l += (b - '0'); | |
72 b = readByte(); | |
73 } | |
74 pushBack(b); | |
75 return l; | |
76 } | |
77 | |
78 /** Parses an address in the form 0x12345678 in US-ASCII encoding on | |
79 the input stream */ | |
80 public long parseAddress() throws IOException { | |
81 skipWhitespace(); | |
82 byte b; | |
83 if ((b = readByte()) != '0') { | |
84 error(); | |
85 } | |
86 b = readByte(); | |
87 if (b != 'x') { | |
88 error(); | |
89 } | |
90 long val = 0; | |
91 while (isHexDigit((char) (b = readByte()))) { | |
92 val *= 16; | |
93 val += Character.digit((char) b, 16); | |
94 } | |
95 pushBack(b); | |
96 return val; | |
97 } | |
98 | |
99 public void skipByte() throws IOException { | |
100 readByte(); | |
101 } | |
102 | |
103 /** Reads binary data; one byte */ | |
104 public byte readByte() throws IOException { | |
105 if (pushedBack) { | |
106 pushedBack = false; | |
107 return backBuf; | |
108 } | |
109 return readByteInternal(); | |
110 } | |
111 | |
112 /** Reads a block of binary data in BLOCKING fashion */ | |
113 public void readBytes(byte[] buf, int off, int len) throws IOException { | |
114 int startIdx = off; | |
115 int numRead = 0; | |
116 if (pushedBack) { | |
117 buf[startIdx] = backBuf; | |
118 pushedBack = false; | |
119 ++startIdx; | |
120 ++numRead; | |
121 } | |
122 while (numRead < len) { | |
123 numRead += in.read(buf, startIdx + numRead, len - numRead); | |
124 } | |
125 // if (numRead != len) { | |
126 // throw new IOException("Only read " + numRead + " out of " + | |
127 // len + " bytes requested"); | |
128 // } | |
129 } | |
130 | |
131 /** Reads binary data; one 16-bit character in big-endian format */ | |
132 public char readChar() throws IOException { | |
133 int hi = ((int) readByte()) & 0xFF; | |
134 int lo = ((int) readByte()) & 0xFF; | |
135 return (char) ((hi << 8) | lo); | |
136 } | |
137 | |
138 /** Reads binary data; one 32-bit unsigned int in big-endian format. | |
139 Returned as a long. */ | |
140 public long readUnsignedInt() throws IOException { | |
141 long b1 = ((long) readByte()) & 0xFF; | |
142 long b2 = ((long) readByte()) & 0xFF; | |
143 long b3 = ((long) readByte()) & 0xFF; | |
144 long b4 = ((long) readByte()) & 0xFF; | |
145 | |
146 return ((b1 << 24) | (b2 << 16) | (b3 << 8) | b4); | |
147 } | |
148 | |
149 /** Reads binary data; a US-ASCII string of the specified length */ | |
150 public String readByteString(int len) throws IOException { | |
151 byte[] b = new byte[len]; | |
152 for (int i = 0; i < len; i++) { | |
153 b[i] = readByte(); | |
154 } | |
155 try { | |
156 return new String(b, "US-ASCII"); | |
157 } | |
158 catch (UnsupportedEncodingException e) { | |
159 throw new IOException(e.toString()); | |
160 } | |
161 } | |
162 | |
163 /** Reads binary data; a Unicode string of the specified length */ | |
164 public String readCharString(int len) throws IOException { | |
165 char[] c = new char[len]; | |
166 for (int i = 0; i < len; i++) { | |
167 c[i] = readChar(); | |
168 } | |
169 return new String(c); | |
170 } | |
171 | |
172 //---------------------------------------------------------------------- | |
173 // Internals only below this point | |
174 // | |
175 | |
176 private void skipWhitespace() throws IOException { | |
177 byte b; | |
178 while (Character.isWhitespace((char) (b = readByte()))) { | |
179 } | |
180 pushBack(b); | |
181 } | |
182 | |
183 private boolean isHexDigit(char c) { | |
184 return (('0' <= c && c <= '9') || | |
185 ('a' <= c && c <= 'f') || | |
186 ('A' <= c && c <= 'F')); | |
187 } | |
188 | |
189 private void pushBack(byte b) { | |
190 if (pushedBack) { | |
191 throw new InternalError("Only one character pushback supported"); | |
192 } | |
193 backBuf = b; | |
194 pushedBack = true; | |
195 } | |
196 | |
197 private byte readByteInternal() throws IOException { | |
198 int i = in.read(); | |
199 if (i == -1) { | |
200 throw new IOException("End-of-file reached while reading from server"); | |
201 } | |
202 return (byte) i; | |
203 } | |
204 | |
205 private void error() throws IOException { | |
206 throw new IOException("Error parsing output of debug server"); | |
207 } | |
208 | |
209 private BufferedInputStream in; | |
210 private boolean pushedBack; | |
211 private byte backBuf; | |
212 } |