Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeStream.java @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | c18cbe5936b8 |
children | 6a991dcb52bb |
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) 2001, 2002, 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.interpreter; | |
26 | |
27 import sun.jvm.hotspot.oops.*; | |
28 import sun.jvm.hotspot.runtime.*; | |
29 import sun.jvm.hotspot.utilities.*; | |
30 | |
31 public class BytecodeStream { | |
32 private Method _method; | |
33 | |
34 // reading position | |
35 private int _bci; // bci if current bytecode | |
36 private int _next_bci; // bci of next bytecode | |
37 private int _end_bci; // bci after the current iteration interval | |
38 | |
39 // last bytecode read | |
40 private int _code; | |
41 private boolean _is_wide; | |
42 | |
43 // Construction | |
44 public BytecodeStream(Method method) { | |
45 _method = method; | |
46 setInterval(0, (int) method.getCodeSize()); | |
47 } | |
48 | |
49 // Iteration control | |
50 public void setInterval(int beg_bci, int end_bci) { | |
51 if (Assert.ASSERTS_ENABLED) { | |
52 Assert.that(0 <= beg_bci && beg_bci <= _method.getCodeSize(), "illegal beg_bci"); | |
53 Assert.that(0 <= end_bci && end_bci <= _method.getCodeSize(), "illegal end_bci"); | |
54 } | |
55 // setup of iteration pointers | |
56 _bci = beg_bci; | |
57 _next_bci = beg_bci; | |
58 _end_bci = end_bci; | |
59 } | |
60 | |
61 public void setStart(int beg_bci) { | |
62 setInterval(beg_bci, (int) _method.getCodeSize()); | |
63 } | |
64 | |
65 // Iteration | |
66 public int next() { | |
67 int code; | |
68 // set reading position | |
69 _bci = _next_bci; | |
70 if (isLastBytecode()) { | |
71 // indicate end of bytecode stream | |
72 code = Bytecodes._illegal; | |
73 } else { | |
74 // get bytecode | |
75 int rawCode = Bytecodes.codeAt(_method, _bci); | |
76 code = 0; // Make javac happy | |
77 try { | |
78 code = Bytecodes.javaCode(rawCode); | |
79 } catch (AssertionFailure e) { | |
80 e.printStackTrace(); | |
81 Assert.that(false, "Failure occurred at bci " + _bci + " in method " + _method.externalNameAndSignature()); | |
82 } | |
83 | |
84 // set next bytecode position | |
85 // | |
86 int l = Bytecodes.lengthFor(code); | |
87 if (l == 0) l = Bytecodes.lengthAt(_method, _bci); | |
88 _next_bci += l; | |
89 if (Assert.ASSERTS_ENABLED) { | |
90 Assert.that(_bci < _next_bci, "length must be > 0"); | |
91 } | |
92 // set attributes | |
93 _is_wide = false; | |
94 // check for special (uncommon) cases | |
95 if (code == Bytecodes._wide) { | |
96 code = _method.getBytecodeOrBPAt(_bci + 1); | |
97 _is_wide = true; | |
98 } | |
99 if (Assert.ASSERTS_ENABLED) { | |
100 Assert.that(Bytecodes.isJavaCode(code), "sanity check"); | |
101 } | |
102 } | |
103 _code = code; | |
104 return _code; | |
105 } | |
106 | |
107 // Stream attributes | |
108 public Method method() { return _method; } | |
109 public int bci() { return _bci; } | |
110 public int nextBCI() { return _next_bci; } | |
111 public int endBCI() { return _end_bci; } | |
112 public int code() { return _code; } | |
113 public boolean isWide() { return _is_wide; } | |
114 public boolean isActiveBreakpoint() { return Bytecodes.isActiveBreakpointAt(_method, _bci); } | |
115 public boolean isLastBytecode() { return _next_bci >= _end_bci; } | |
116 | |
117 // State changes | |
118 public void setNextBCI(int bci) { | |
119 if (Assert.ASSERTS_ENABLED) { | |
120 Assert.that(0 <= bci && bci <= _method.getCodeSize(), "illegal bci"); | |
121 } | |
122 _next_bci = bci; | |
123 } | |
124 | |
125 // Bytecode-specific attributes | |
126 public int dest() { return bci() + _method.getBytecodeShortArg(bci() + 1); } | |
127 public int dest_w() { return bci() + _method.getBytecodeIntArg(bci() + 1); } | |
128 | |
129 // Unsigned indices, widening | |
130 public int getIndex() { return (isWide()) | |
131 ? (_method.getBytecodeShortArg(bci() + 2) & 0xFFFF) | |
132 : (_method.getBytecodeOrBPAt(bci() + 1) & 0xFF); } | |
133 public int getIndexBig() { return _method.getBytecodeShortArg(bci() + 1); } | |
134 | |
135 // Fetch at absolute BCI (for manual parsing of certain bytecodes) | |
136 public int codeAt(int bci) { | |
137 return _method.getBytecodeOrBPAt(bci); | |
138 } | |
139 } |