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 |
|---|---|
| date | Thu, 27 Jan 2011 16:11:27 -0800 |
| parents | c18cbe5936b8 |
| children | 6a991dcb52bb |
| rev | line source |
|---|---|
| 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 |
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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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c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 } |