Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeLoadConstant.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2002-2003 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.interpreter; | |
26 | |
27 import sun.jvm.hotspot.oops.*; | |
28 import sun.jvm.hotspot.utilities.*; | |
29 | |
30 public class BytecodeLoadConstant extends BytecodeWithCPIndex { | |
31 BytecodeLoadConstant(Method method, int bci) { | |
32 super(method, bci); | |
33 } | |
34 | |
35 public int index() { | |
36 return javaCode() == Bytecodes._ldc ? | |
37 (int) (0xFF & javaByteAt(1)) | |
38 : (int) (0xFFFF & javaShortAt(1)); | |
39 } | |
40 | |
41 public void verify() { | |
42 if (Assert.ASSERTS_ENABLED) { | |
43 Assert.that(isValid(), "check load constant"); | |
44 } | |
45 } | |
46 | |
47 public boolean isValid() { | |
48 int jcode = javaCode(); | |
49 boolean codeOk = jcode == Bytecodes._ldc || jcode == Bytecodes._ldc_w || | |
50 jcode == Bytecodes._ldc2_w; | |
51 if (! codeOk) return false; | |
52 | |
53 ConstantTag ctag = method().getConstants().getTagAt(index()); | |
54 if (jcode == Bytecodes._ldc2_w) { | |
55 // has to be double or long | |
56 return (ctag.isDouble() || ctag.isLong()) ? true: false; | |
57 } else { | |
58 // has to be int or float or String or Klass | |
59 return (ctag.isUnresolvedString() || ctag.isString() | |
60 || ctag.isUnresolvedKlass() || ctag.isKlass() | |
61 || ctag.isInt() || ctag.isFloat())? true: false; | |
62 } | |
63 } | |
64 | |
65 public boolean isKlassConstant() { | |
66 int jcode = javaCode(); | |
67 if (jcode == Bytecodes._ldc2_w) { | |
68 return false; | |
69 } | |
70 | |
71 ConstantTag ctag = method().getConstants().getTagAt(index()); | |
72 return ctag.isKlass() || ctag.isUnresolvedKlass(); | |
73 } | |
74 | |
75 // return Symbol (if unresolved) or Klass (if resolved) | |
76 public Oop getKlass() { | |
77 if (Assert.ASSERTS_ENABLED) { | |
78 Assert.that(isKlassConstant(), "not a klass literal"); | |
79 } | |
80 // tag change from 'unresolved' to 'klass' does not happen atomically. | |
81 // We just look at the object at the corresponding index and | |
82 // decide based on the oop type. | |
83 ConstantPool cpool = method().getConstants(); | |
84 int cpIndex = index(); | |
85 Oop oop = cpool.getObjAt(cpIndex); | |
86 if (oop.isKlass()) { | |
87 return (Klass) oop; | |
88 } else if (oop.isSymbol()) { | |
89 return (Symbol) oop; | |
90 } else { | |
91 throw new RuntimeException("should not reach here"); | |
92 } | |
93 } | |
94 | |
95 public static BytecodeLoadConstant at(Method method, int bci) { | |
96 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci); | |
97 if (Assert.ASSERTS_ENABLED) { | |
98 b.verify(); | |
99 } | |
100 return b; | |
101 } | |
102 | |
103 /** Like at, but returns null if the BCI is not at ldc or ldc_w or ldc2_w */ | |
104 public static BytecodeLoadConstant atCheck(Method method, int bci) { | |
105 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci); | |
106 return (b.isValid() ? b : null); | |
107 } | |
108 | |
109 public static BytecodeLoadConstant at(BytecodeStream bcs) { | |
110 return new BytecodeLoadConstant(bcs.method(), bcs.bci()); | |
111 } | |
112 | |
113 public String getConstantValue() { | |
114 ConstantPool cpool = method().getConstants(); | |
115 int cpIndex = index(); | |
116 ConstantTag ctag = cpool.getTagAt(cpIndex); | |
117 if (ctag.isInt()) { | |
118 return "<int " + Integer.toString(cpool.getIntAt(cpIndex)) +">"; | |
119 } else if (ctag.isLong()) { | |
120 return "<long " + Long.toString(cpool.getLongAt(cpIndex)) + "L>"; | |
121 } else if (ctag.isFloat()) { | |
122 return "<float " + Float.toString(cpool.getFloatAt(cpIndex)) + "F>"; | |
123 } else if (ctag.isDouble()) { | |
124 return "<double " + Double.toString(cpool.getDoubleAt(cpIndex)) + "D>"; | |
125 } else if (ctag.isString() || ctag.isUnresolvedString()) { | |
126 // tag change from 'unresolved' to 'string' does not happen atomically. | |
127 // We just look at the object at the corresponding index and | |
128 // decide based on the oop type. | |
129 Oop obj = cpool.getObjAt(cpIndex); | |
130 if (obj.isSymbol()) { | |
131 Symbol sym = (Symbol) obj; | |
132 return "<String \"" + sym.asString() + "\">"; | |
133 } else if (obj.isInstance()) { | |
134 return "<String \"" + OopUtilities.stringOopToString(obj) + "\">"; | |
135 } else { | |
136 throw new RuntimeException("should not reach here"); | |
137 } | |
138 } else if (ctag.isKlass() || ctag.isUnresolvedKlass()) { | |
139 // tag change from 'unresolved' to 'klass' does not happen atomically. | |
140 // We just look at the object at the corresponding index and | |
141 // decide based on the oop type. | |
142 Oop obj = cpool.getObjAt(cpIndex); | |
143 if (obj.isKlass()) { | |
144 Klass k = (Klass) obj; | |
145 return "<Class " + k.getName().asString() + "@" + k.getHandle() + ">"; | |
146 } else if (obj.isSymbol()) { | |
147 Symbol sym = (Symbol) obj; | |
148 return "<Class " + sym.asString() + ">"; | |
149 } else { | |
150 throw new RuntimeException("should not reach here"); | |
151 } | |
152 } else { | |
153 if (Assert.ASSERTS_ENABLED) { | |
154 Assert.that(false, "invalid load constant type"); | |
155 } | |
156 return null; | |
157 } | |
158 } | |
159 | |
160 public String toString() { | |
161 StringBuffer buf = new StringBuffer(); | |
162 buf.append(getJavaBytecodeName()); | |
163 buf.append(spaces); | |
164 buf.append('#'); | |
165 buf.append(Integer.toString(index())); | |
166 buf.append(spaces); | |
167 buf.append(getConstantValue()); | |
168 if (code() != javaCode()) { | |
169 buf.append(spaces); | |
170 buf.append('['); | |
171 buf.append(getBytecodeName()); | |
172 buf.append(']'); | |
173 } | |
174 return buf.toString(); | |
175 } | |
176 } |