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1 /* |
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2 * Copyright (c) 2009, Oracle and/or its affiliates. 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.javap; |
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27 |
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28 import com.sun.tools.classfile.Attribute; |
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29 import com.sun.tools.classfile.Code_attribute; |
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30 import com.sun.tools.classfile.ConstantPool; |
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31 import com.sun.tools.classfile.ConstantPoolException; |
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32 import com.sun.tools.classfile.Descriptor; |
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33 import com.sun.tools.classfile.Descriptor.InvalidDescriptor; |
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34 import com.sun.tools.classfile.Instruction; |
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35 import com.sun.tools.classfile.LocalVariableTable_attribute; |
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36 import java.util.ArrayList; |
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37 import java.util.HashMap; |
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38 import java.util.List; |
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39 import java.util.ListIterator; |
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40 import java.util.Map; |
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41 |
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42 /** |
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43 * Annotate instructions with details about local variables. |
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44 * |
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45 * <p><b>This is NOT part of any supported API. |
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46 * If you write code that depends on this, you do so at your own risk. |
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47 * This code and its internal interfaces are subject to change or |
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48 * deletion without notice.</b> |
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49 */ |
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50 public class LocalVariableTableWriter extends InstructionDetailWriter { |
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51 public enum NoteKind { |
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52 START("start") { |
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53 public boolean match(LocalVariableTable_attribute.Entry entry, int pc) { |
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54 return (pc == entry.start_pc); |
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55 } |
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56 }, |
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57 END("end") { |
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58 public boolean match(LocalVariableTable_attribute.Entry entry, int pc) { |
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59 return (pc == entry.start_pc + entry.length); |
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60 } |
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61 }; |
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62 NoteKind(String text) { |
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63 this.text = text; |
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64 } |
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65 public abstract boolean match(LocalVariableTable_attribute.Entry entry, int pc); |
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66 public final String text; |
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67 } |
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68 |
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69 static LocalVariableTableWriter instance(Context context) { |
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70 LocalVariableTableWriter instance = context.get(LocalVariableTableWriter.class); |
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71 if (instance == null) |
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72 instance = new LocalVariableTableWriter(context); |
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73 return instance; |
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74 } |
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75 |
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76 protected LocalVariableTableWriter(Context context) { |
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77 super(context); |
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78 context.put(LocalVariableTableWriter.class, this); |
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79 classWriter = ClassWriter.instance(context); |
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80 } |
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81 |
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82 public void reset(Code_attribute attr) { |
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83 codeAttr = attr; |
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84 pcMap = new HashMap<>(); |
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85 LocalVariableTable_attribute lvt = |
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86 (LocalVariableTable_attribute) (attr.attributes.get(Attribute.LocalVariableTable)); |
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87 if (lvt == null) |
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88 return; |
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89 |
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90 for (int i = 0; i < lvt.local_variable_table.length; i++) { |
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91 LocalVariableTable_attribute.Entry entry = lvt.local_variable_table[i]; |
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92 put(entry.start_pc, entry); |
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93 put(entry.start_pc + entry.length, entry); |
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94 } |
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95 } |
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96 |
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97 public void writeDetails(Instruction instr) { |
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98 int pc = instr.getPC(); |
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99 writeLocalVariables(pc, NoteKind.END); |
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100 writeLocalVariables(pc, NoteKind.START); |
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101 } |
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102 |
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103 @Override |
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104 public void flush() { |
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105 int pc = codeAttr.code_length; |
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106 writeLocalVariables(pc, NoteKind.END); |
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107 } |
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108 |
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109 public void writeLocalVariables(int pc, NoteKind kind) { |
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110 ConstantPool constant_pool = classWriter.getClassFile().constant_pool; |
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111 String indent = space(2); // get from Options? |
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112 List<LocalVariableTable_attribute.Entry> entries = pcMap.get(pc); |
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113 if (entries != null) { |
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114 for (ListIterator<LocalVariableTable_attribute.Entry> iter = |
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115 entries.listIterator(kind == NoteKind.END ? entries.size() : 0); |
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116 kind == NoteKind.END ? iter.hasPrevious() : iter.hasNext() ; ) { |
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117 LocalVariableTable_attribute.Entry entry = |
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118 kind == NoteKind.END ? iter.previous() : iter.next(); |
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119 if (kind.match(entry, pc)) { |
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120 print(indent); |
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121 print(kind.text); |
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122 print(" local "); |
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123 print(entry.index); |
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124 print(" // "); |
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125 Descriptor d = new Descriptor(entry.descriptor_index); |
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126 try { |
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127 print(d.getFieldType(constant_pool)); |
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128 } catch (InvalidDescriptor e) { |
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129 print(report(e)); |
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130 } catch (ConstantPoolException e) { |
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131 print(report(e)); |
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132 } |
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133 print(" "); |
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134 try { |
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135 print(constant_pool.getUTF8Value(entry.name_index)); |
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136 } catch (ConstantPoolException e) { |
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137 print(report(e)); |
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138 } |
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139 println(); |
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140 } |
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141 } |
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142 } |
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143 } |
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144 |
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145 private void put(int pc, LocalVariableTable_attribute.Entry entry) { |
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146 List<LocalVariableTable_attribute.Entry> list = pcMap.get(pc); |
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147 if (list == null) { |
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148 list = new ArrayList<>(); |
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149 pcMap.put(pc, list); |
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150 } |
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151 if (!list.contains(entry)) |
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152 list.add(entry); |
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153 } |
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154 |
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155 private ClassWriter classWriter; |
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156 private Code_attribute codeAttr; |
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157 private Map<Integer, List<LocalVariableTable_attribute.Entry>> pcMap; |
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158 } |