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1 /*
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2 * Copyright 2002-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.interpreter;
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26
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27 import sun.jvm.hotspot.oops.*;
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28 import sun.jvm.hotspot.utilities.*;
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29
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30 public class BytecodeLoadConstant extends BytecodeWithCPIndex {
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31 BytecodeLoadConstant(Method method, int bci) {
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32 super(method, bci);
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33 }
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34
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35 public int index() {
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36 return javaCode() == Bytecodes._ldc ?
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37 (int) (0xFF & javaByteAt(1))
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38 : (int) (0xFFFF & javaShortAt(1));
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39 }
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40
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41 public void verify() {
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42 if (Assert.ASSERTS_ENABLED) {
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43 Assert.that(isValid(), "check load constant");
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44 }
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45 }
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46
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47 public boolean isValid() {
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48 int jcode = javaCode();
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49 boolean codeOk = jcode == Bytecodes._ldc || jcode == Bytecodes._ldc_w ||
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50 jcode == Bytecodes._ldc2_w;
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51 if (! codeOk) return false;
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52
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53 ConstantTag ctag = method().getConstants().getTagAt(index());
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54 if (jcode == Bytecodes._ldc2_w) {
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55 // has to be double or long
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56 return (ctag.isDouble() || ctag.isLong()) ? true: false;
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57 } else {
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58 // has to be int or float or String or Klass
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59 return (ctag.isUnresolvedString() || ctag.isString()
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60 || ctag.isUnresolvedKlass() || ctag.isKlass()
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61 || ctag.isInt() || ctag.isFloat())? true: false;
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62 }
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63 }
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64
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65 public boolean isKlassConstant() {
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66 int jcode = javaCode();
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67 if (jcode == Bytecodes._ldc2_w) {
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68 return false;
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69 }
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70
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71 ConstantTag ctag = method().getConstants().getTagAt(index());
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72 return ctag.isKlass() || ctag.isUnresolvedKlass();
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73 }
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74
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75 // return Symbol (if unresolved) or Klass (if resolved)
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76 public Oop getKlass() {
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77 if (Assert.ASSERTS_ENABLED) {
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78 Assert.that(isKlassConstant(), "not a klass literal");
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79 }
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80 // tag change from 'unresolved' to 'klass' does not happen atomically.
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81 // We just look at the object at the corresponding index and
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82 // decide based on the oop type.
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83 ConstantPool cpool = method().getConstants();
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84 int cpIndex = index();
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85 Oop oop = cpool.getObjAt(cpIndex);
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86 if (oop.isKlass()) {
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87 return (Klass) oop;
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88 } else if (oop.isSymbol()) {
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89 return (Symbol) oop;
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90 } else {
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91 throw new RuntimeException("should not reach here");
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92 }
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93 }
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94
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95 public static BytecodeLoadConstant at(Method method, int bci) {
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96 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci);
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97 if (Assert.ASSERTS_ENABLED) {
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98 b.verify();
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99 }
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100 return b;
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101 }
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102
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103 /** Like at, but returns null if the BCI is not at ldc or ldc_w or ldc2_w */
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104 public static BytecodeLoadConstant atCheck(Method method, int bci) {
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105 BytecodeLoadConstant b = new BytecodeLoadConstant(method, bci);
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106 return (b.isValid() ? b : null);
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107 }
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108
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109 public static BytecodeLoadConstant at(BytecodeStream bcs) {
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110 return new BytecodeLoadConstant(bcs.method(), bcs.bci());
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111 }
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112
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113 public String getConstantValue() {
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114 ConstantPool cpool = method().getConstants();
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115 int cpIndex = index();
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116 ConstantTag ctag = cpool.getTagAt(cpIndex);
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117 if (ctag.isInt()) {
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118 return "<int " + Integer.toString(cpool.getIntAt(cpIndex)) +">";
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119 } else if (ctag.isLong()) {
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120 return "<long " + Long.toString(cpool.getLongAt(cpIndex)) + "L>";
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121 } else if (ctag.isFloat()) {
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122 return "<float " + Float.toString(cpool.getFloatAt(cpIndex)) + "F>";
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123 } else if (ctag.isDouble()) {
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124 return "<double " + Double.toString(cpool.getDoubleAt(cpIndex)) + "D>";
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125 } else if (ctag.isString() || ctag.isUnresolvedString()) {
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126 // tag change from 'unresolved' to 'string' does not happen atomically.
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127 // We just look at the object at the corresponding index and
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128 // decide based on the oop type.
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129 Oop obj = cpool.getObjAt(cpIndex);
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130 if (obj.isSymbol()) {
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131 Symbol sym = (Symbol) obj;
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132 return "<String \"" + sym.asString() + "\">";
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133 } else if (obj.isInstance()) {
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134 return "<String \"" + OopUtilities.stringOopToString(obj) + "\">";
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135 } else {
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136 throw new RuntimeException("should not reach here");
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137 }
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138 } else if (ctag.isKlass() || ctag.isUnresolvedKlass()) {
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139 // tag change from 'unresolved' to 'klass' does not happen atomically.
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140 // We just look at the object at the corresponding index and
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141 // decide based on the oop type.
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142 Oop obj = cpool.getObjAt(cpIndex);
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143 if (obj.isKlass()) {
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144 Klass k = (Klass) obj;
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145 return "<Class " + k.getName().asString() + "@" + k.getHandle() + ">";
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146 } else if (obj.isSymbol()) {
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147 Symbol sym = (Symbol) obj;
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148 return "<Class " + sym.asString() + ">";
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149 } else {
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150 throw new RuntimeException("should not reach here");
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151 }
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152 } else {
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153 if (Assert.ASSERTS_ENABLED) {
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154 Assert.that(false, "invalid load constant type");
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155 }
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156 return null;
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157 }
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158 }
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159
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160 public String toString() {
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161 StringBuffer buf = new StringBuffer();
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162 buf.append(getJavaBytecodeName());
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163 buf.append(spaces);
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164 buf.append('#');
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165 buf.append(Integer.toString(index()));
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166 buf.append(spaces);
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167 buf.append(getConstantValue());
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168 if (code() != javaCode()) {
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169 buf.append(spaces);
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170 buf.append('[');
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171 buf.append(getBytecodeName());
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172 buf.append(']');
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173 }
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174 return buf.toString();
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175 }
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176 }
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