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1 /* |
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2 * Copyright (c) 2009, 2010, 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 java.io.BufferedReader; |
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29 import java.io.IOException; |
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30 import java.io.StringReader; |
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31 import java.util.ArrayList; |
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32 import java.util.List; |
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33 import java.util.Set; |
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34 import java.util.SortedMap; |
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35 import java.util.SortedSet; |
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36 import java.util.TreeMap; |
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37 import java.util.TreeSet; |
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38 import javax.tools.JavaFileManager; |
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39 import javax.tools.JavaFileManager.Location; |
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40 import javax.tools.JavaFileObject; |
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41 import javax.tools.StandardLocation; |
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42 |
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43 import com.sun.tools.classfile.Attribute; |
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44 import com.sun.tools.classfile.ClassFile; |
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45 import com.sun.tools.classfile.Code_attribute; |
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46 import com.sun.tools.classfile.ConstantPoolException; |
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47 import com.sun.tools.classfile.Instruction; |
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48 import com.sun.tools.classfile.LineNumberTable_attribute; |
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49 import com.sun.tools.classfile.SourceFile_attribute; |
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50 |
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51 |
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52 /** |
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53 * Annotate instructions with source code. |
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54 * |
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55 * <p><b>This is NOT part of any supported API. |
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56 * If you write code that depends on this, you do so at your own risk. |
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57 * This code and its internal interfaces are subject to change or |
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58 * deletion without notice.</b> |
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59 */ |
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60 public class SourceWriter extends InstructionDetailWriter { |
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61 static SourceWriter instance(Context context) { |
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62 SourceWriter instance = context.get(SourceWriter.class); |
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63 if (instance == null) |
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64 instance = new SourceWriter(context); |
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65 return instance; |
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66 } |
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67 |
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68 protected SourceWriter(Context context) { |
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69 super(context); |
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70 context.put(SourceWriter.class, this); |
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71 } |
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72 |
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73 void setFileManager(JavaFileManager fileManager) { |
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74 this.fileManager = fileManager; |
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75 } |
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76 |
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77 public void reset(ClassFile cf, Code_attribute attr) { |
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78 setSource(cf); |
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79 setLineMap(attr); |
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80 } |
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81 |
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82 public void writeDetails(Instruction instr) { |
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83 String indent = space(40); // could get from Options? |
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84 Set<Integer> lines = lineMap.get(instr.getPC()); |
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85 if (lines != null) { |
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86 for (int line: lines) { |
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87 print(indent); |
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88 print(String.format(" %4d ", line)); |
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89 if (line < sourceLines.length) |
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90 print(sourceLines[line]); |
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91 println(); |
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92 int nextLine = nextLine(line); |
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93 for (int i = line + 1; i < nextLine; i++) { |
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94 print(indent); |
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95 print(String.format("(%4d)", i)); |
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96 if (i < sourceLines.length) |
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97 print(sourceLines[i]); |
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98 println(); |
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99 } |
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100 } |
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101 } |
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102 } |
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103 |
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104 public boolean hasSource() { |
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105 return (sourceLines.length > 0); |
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106 } |
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107 |
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108 private void setLineMap(Code_attribute attr) { |
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109 SortedMap<Integer, SortedSet<Integer>> map = new TreeMap<>(); |
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110 SortedSet<Integer> allLines = new TreeSet<>(); |
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111 for (Attribute a: attr.attributes) { |
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112 if (a instanceof LineNumberTable_attribute) { |
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113 LineNumberTable_attribute t = (LineNumberTable_attribute) a; |
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114 for (LineNumberTable_attribute.Entry e: t.line_number_table) { |
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115 int start_pc = e.start_pc; |
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116 int line = e.line_number; |
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117 SortedSet<Integer> pcLines = map.get(start_pc); |
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118 if (pcLines == null) { |
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119 pcLines = new TreeSet<>(); |
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120 map.put(start_pc, pcLines); |
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121 } |
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122 pcLines.add(line); |
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123 allLines.add(line); |
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124 } |
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125 } |
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126 } |
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127 lineMap = map; |
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128 lineList = new ArrayList<>(allLines); |
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129 } |
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130 |
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131 private void setSource(ClassFile cf) { |
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132 if (cf != classFile) { |
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133 classFile = cf; |
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134 sourceLines = splitLines(readSource(cf)); |
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135 } |
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136 } |
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137 |
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138 private String readSource(ClassFile cf) { |
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139 if (fileManager == null) |
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140 return null; |
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141 |
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142 Location location; |
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143 if (fileManager.hasLocation((StandardLocation.SOURCE_PATH))) |
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144 location = StandardLocation.SOURCE_PATH; |
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145 else |
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146 location = StandardLocation.CLASS_PATH; |
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147 |
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148 // Guess the source file for a class from the package name for this |
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149 // class and the base of the source file. This avoids having to read |
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150 // additional classes to determine the outmost class from any |
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151 // InnerClasses and EnclosingMethod attributes. |
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152 try { |
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153 String className = cf.getName(); |
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154 SourceFile_attribute sf = |
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155 (SourceFile_attribute) cf.attributes.get(Attribute.SourceFile); |
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156 if (sf == null) { |
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157 report(messages.getMessage("err.no.SourceFile.attribute")); |
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158 return null; |
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159 } |
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160 String sourceFile = sf.getSourceFile(cf.constant_pool); |
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161 String fileBase = sourceFile.endsWith(".java") |
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162 ? sourceFile.substring(0, sourceFile.length() - 5) : sourceFile; |
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163 int sep = className.lastIndexOf("/"); |
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164 String pkgName = (sep == -1 ? "" : className.substring(0, sep+1)); |
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165 String topClassName = (pkgName + fileBase).replace('/', '.'); |
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166 JavaFileObject fo = |
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167 fileManager.getJavaFileForInput(location, |
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168 topClassName, |
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169 JavaFileObject.Kind.SOURCE); |
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170 if (fo == null) { |
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171 report(messages.getMessage("err.source.file.not.found")); |
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172 return null; |
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173 } |
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174 return fo.getCharContent(true).toString(); |
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175 } catch (ConstantPoolException e) { |
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176 report(e); |
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177 return null; |
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178 } catch (IOException e) { |
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179 report(e.getLocalizedMessage()); |
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180 return null; |
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181 } |
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182 } |
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183 |
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184 private static String[] splitLines(String text) { |
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185 if (text == null) |
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186 return new String[0]; |
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187 |
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188 List<String> lines = new ArrayList<>(); |
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189 lines.add(""); // dummy line 0 |
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190 try { |
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191 BufferedReader r = new BufferedReader(new StringReader(text)); |
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192 String line; |
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193 while ((line = r.readLine()) != null) |
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194 lines.add(line); |
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195 } catch (IOException ignore) { |
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196 } |
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197 return lines.toArray(new String[lines.size()]); |
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198 } |
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199 |
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200 private int nextLine(int line) { |
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201 int i = lineList.indexOf(line); |
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202 if (i == -1 || i == lineList.size() - 1) |
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203 return - 1; |
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204 return lineList.get(i + 1); |
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205 } |
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206 |
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207 private JavaFileManager fileManager; |
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208 private ClassFile classFile; |
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209 private SortedMap<Integer, SortedSet<Integer>> lineMap; |
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210 private List<Integer> lineList; |
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211 private String[] sourceLines; |
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212 } |