Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: src/share/classes/com/sun/tools/javap/SourceWriter.java

src/share/classes/com/sun/tools/javap/SourceWriter.java

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1 /*
2 * Copyright 2009 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package com.sun.tools.javap;
27
28 import java.io.BufferedReader;
29 import java.io.IOException;
30 import java.io.StringReader;
31 import java.util.ArrayList;
32 import java.util.List;
33 import java.util.Set;
34 import java.util.SortedMap;
35 import java.util.SortedSet;
36 import java.util.TreeMap;
37 import java.util.TreeSet;
38 import javax.tools.JavaFileManager;
39 import javax.tools.JavaFileManager.Location;
40 import javax.tools.JavaFileObject;
41 import javax.tools.StandardLocation;
42
43 import com.sun.tools.classfile.Attribute;
44 import com.sun.tools.classfile.ClassFile;
45 import com.sun.tools.classfile.Code_attribute;
46 import com.sun.tools.classfile.ConstantPoolException;
47 import com.sun.tools.classfile.Instruction;
48 import com.sun.tools.classfile.LineNumberTable_attribute;
49 import com.sun.tools.classfile.SourceFile_attribute;
50
51
52 /**
53 * Annotate instructions with source code.
54 *
55 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
56 * you write code that depends on this, you do so at your own risk.
57 * This code and its internal interfaces are subject to change or
58 * deletion without notice.</b>
59 */
60 public class SourceWriter extends InstructionDetailWriter {
61 static SourceWriter instance(Context context) {
62 SourceWriter instance = context.get(SourceWriter.class);
63 if (instance == null)
64 instance = new SourceWriter(context);
65 return instance;
66 }
67
68 protected SourceWriter(Context context) {
69 super(context);
70 context.put(SourceWriter.class, this);
71 }
72
73 void setFileManager(JavaFileManager fileManager) {
74 this.fileManager = fileManager;
75 }
76
77 public void reset(ClassFile cf, Code_attribute attr) {
78 setSource(cf);
79 setLineMap(attr);
80 }
81
82 public void writeDetails(Instruction instr) {
83 String indent = space(40); // could get from Options?
84 Set<Integer> lines = lineMap.get(instr.getPC());
85 if (lines != null) {
86 for (int line: lines) {
87 print(indent);
88 print(String.format(" %4d ", line));
89 if (line < sourceLines.length)
90 print(sourceLines[line]);
91 println();
92 int nextLine = nextLine(line);
93 for (int i = line + 1; i < nextLine; i++) {
94 print(indent);
95 print(String.format("(%4d)", i));
96 if (i < sourceLines.length)
97 print(sourceLines[i]);
98 println();
99 }
100 }
101 }
102
103 }
104
105 private void setLineMap(Code_attribute attr) {
106 SortedMap<Integer, SortedSet<Integer>> map =
107 new TreeMap<Integer, SortedSet<Integer>>();
108 SortedSet<Integer> allLines = new TreeSet<Integer>();
109 for (Attribute a: attr.attributes) {
110 if (a instanceof LineNumberTable_attribute) {
111 LineNumberTable_attribute t = (LineNumberTable_attribute) a;
112 for (LineNumberTable_attribute.Entry e: t.line_number_table) {
113 int start_pc = e.start_pc;
114 int line = e.line_number;
115 SortedSet<Integer> pcLines = map.get(start_pc);
116 if (pcLines == null) {
117 pcLines = new TreeSet<Integer>();
118 map.put(start_pc, pcLines);
119 }
120 pcLines.add(line);
121 allLines.add(line);
122 }
123 }
124 }
125 lineMap = map;
126 lineList = new ArrayList<Integer>(allLines);
127 }
128
129 private void setSource(ClassFile cf) {
130 if (cf != classFile) {
131 classFile = cf;
132 sourceLines = splitLines(readSource(cf));
133 }
134 }
135
136 private String readSource(ClassFile cf) {
137 Location location;
138 if (fileManager.hasLocation((StandardLocation.SOURCE_PATH)))
139 location = StandardLocation.SOURCE_PATH;
140 else
141 location = StandardLocation.CLASS_PATH;
142
143 // Guess the source file for a class from the package name for this
144 // class and the base of the source file. This avoids having to read
145 // additional classes to determine the outmost class from any
146 // InnerClasses and EnclosingMethod attributes.
147 try {
148 String className = cf.getName();
149 SourceFile_attribute sf =
150 (SourceFile_attribute) cf.attributes.get(Attribute.SourceFile);
151 if (sf == null) {
152 report(messages.getMessage("err.no.SourceFile.attribute"));
153 return null;
154 }
155 String sourceFile = sf.getSourceFile(cf.constant_pool);
156 String fileBase = sourceFile.endsWith(".java")
157 ? sourceFile.substring(0, sourceFile.length() - 5) : sourceFile;
158 int sep = className.lastIndexOf("/");
159 String pkgName = (sep == -1 ? "" : className.substring(0, sep+1));
160 String topClassName = (pkgName + fileBase).replace('/', '.');
161 JavaFileObject fo =
162 fileManager.getJavaFileForInput(location,
163 topClassName,
164 JavaFileObject.Kind.SOURCE);
165 if (fo == null) {
166 report(messages.getMessage("err.source.file.not.found"));
167 return null;
168 }
169 return fo.getCharContent(true).toString();
170 } catch (ConstantPoolException e) {
171 report(e);
172 return null;
173 } catch (IOException e) {
174 report(e.getLocalizedMessage());
175 return null;
176 }
177 }
178
179 private static String[] splitLines(String text) {
180 if (text == null)
181 return new String[0];
182
183 List<String> lines = new ArrayList<String>();
184 lines.add(""); // dummy line 0
185 try {
186 BufferedReader r = new BufferedReader(new StringReader(text));
187 String line;
188 while ((line = r.readLine()) != null)
189 lines.add(line);
190 } catch (IOException ignore) {
191 }
192 return lines.toArray(new String[lines.size()]);
193 }
194
195 private int nextLine(int line) {
196 int i = lineList.indexOf(line);
197 if (i == -1 || i == lineList.size() - 1)
198 return - 1;
199 return lineList.get(i + 1);
200 }
201
202 private JavaFileManager fileManager;
203 private ClassFile classFile;
204 private SortedMap<Integer, SortedSet<Integer>> lineMap;
205 private List<Integer> lineList;
206 private String[] sourceLines;
207 }

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