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

 /*

  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package com.sun.tools.javap;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.StringReader;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Set;

 import java.util.SortedMap;

 import java.util.SortedSet;

 import java.util.TreeMap;

 import java.util.TreeSet;

 import javax.tools.JavaFileManager;

 import javax.tools.JavaFileManager.Location;

 import javax.tools.JavaFileObject;

 import javax.tools.StandardLocation;

 import com.sun.tools.classfile.Attribute;

 import com.sun.tools.classfile.ClassFile;

 import com.sun.tools.classfile.Code_attribute;

 import com.sun.tools.classfile.ConstantPoolException;

 import com.sun.tools.classfile.Instruction;

 import com.sun.tools.classfile.LineNumberTable_attribute;

 import com.sun.tools.classfile.SourceFile_attribute;

 /**

  * Annotate instructions with source code.

  *

  *  <p><b>This is NOT part of any supported API.

  *  If you write code that depends on this, you do so at your own risk.

  *  This code and its internal interfaces are subject to change or

  *  deletion without notice.</b>

  */

 public class SourceWriter extends InstructionDetailWriter {

     static SourceWriter instance(Context context) {

         SourceWriter instance = context.get(SourceWriter.class);

         if (instance == null)

             instance = new SourceWriter(context);

         return instance;

     }

     protected SourceWriter(Context context) {

         super(context);

         context.put(SourceWriter.class, this);

     }

     void setFileManager(JavaFileManager fileManager) {

         this.fileManager = fileManager;

     }

     public void reset(ClassFile cf, Code_attribute attr) {

         setSource(cf);

         setLineMap(attr);

     }

     public void writeDetails(Instruction instr) {

         String indent = space(40); // could get from Options?

         Set<Integer> lines = lineMap.get(instr.getPC());

         if (lines != null) {

             for (int line: lines) {

                 print(indent);

                 print(String.format(" %4d ", line));

                 if (line < sourceLines.length)

                     print(sourceLines[line]);

                 println();

                 int nextLine = nextLine(line);

                 for (int i = line + 1; i < nextLine; i++) {

                     print(indent);

                     print(String.format("(%4d)", i));

                     if (i < sourceLines.length)

                         print(sourceLines[i]);

                     println();

                 }

             }

         }

     }

     public boolean hasSource() {

         return (sourceLines.length > 0);

     }

     private void setLineMap(Code_attribute attr) {

         SortedMap<Integer, SortedSet<Integer>> map =

                 new TreeMap<Integer, SortedSet<Integer>>();

         SortedSet<Integer> allLines = new TreeSet<Integer>();

         for (Attribute a: attr.attributes) {

             if (a instanceof LineNumberTable_attribute) {

                 LineNumberTable_attribute t = (LineNumberTable_attribute) a;

                 for (LineNumberTable_attribute.Entry e: t.line_number_table) {

                     int start_pc = e.start_pc;

                     int line = e.line_number;

                     SortedSet<Integer> pcLines = map.get(start_pc);

                     if (pcLines == null) {

                         pcLines = new TreeSet<Integer>();

                         map.put(start_pc, pcLines);

                     }

                     pcLines.add(line);

                     allLines.add(line);

                 }

             }

         }

         lineMap = map;

         lineList = new ArrayList<Integer>(allLines);

     }

     private void setSource(ClassFile cf) {

         if (cf != classFile) {

             classFile = cf;

             sourceLines = splitLines(readSource(cf));

         }

     }

     private String readSource(ClassFile cf) {

         if (fileManager == null)

             return null;

         Location location;

         if (fileManager.hasLocation((StandardLocation.SOURCE_PATH)))

             location = StandardLocation.SOURCE_PATH;

         else

             location = StandardLocation.CLASS_PATH;

         // Guess the source file for a class from the package name for this

         // class and the base of the source file. This avoids having to read

         // additional classes to determine the outmost class from any

         // InnerClasses and EnclosingMethod attributes.

         try {

             String className = cf.getName();

             SourceFile_attribute sf =

                     (SourceFile_attribute) cf.attributes.get(Attribute.SourceFile);

             if (sf == null) {

                 report(messages.getMessage("err.no.SourceFile.attribute"));

                 return null;

             }

             String sourceFile = sf.getSourceFile(cf.constant_pool);

             String fileBase = sourceFile.endsWith(".java")

                 ? sourceFile.substring(0, sourceFile.length() - 5) : sourceFile;

             int sep = className.lastIndexOf("/");

             String pkgName = (sep == -1 ? "" : className.substring(0, sep+1));

             String topClassName = (pkgName + fileBase).replace('/', '.');

             JavaFileObject fo =

                     fileManager.getJavaFileForInput(location,

                     topClassName,

                     JavaFileObject.Kind.SOURCE);

             if (fo == null) {

                 report(messages.getMessage("err.source.file.not.found"));

                 return null;

             }

             return fo.getCharContent(true).toString();

         } catch (ConstantPoolException e) {

             report(e);

             return null;

         } catch (IOException e) {

             report(e.getLocalizedMessage());

             return null;

         }

     }

     private static String[] splitLines(String text) {

         if (text == null)

             return new String[0];

         List<String> lines = new ArrayList<String>();

         lines.add(""); // dummy line 0

         try {

             BufferedReader r = new BufferedReader(new StringReader(text));

             String line;

             while ((line = r.readLine()) != null)

                 lines.add(line);

         } catch (IOException ignore) {

         }

         return lines.toArray(new String[lines.size()]);

     }

     private int nextLine(int line) {

         int i = lineList.indexOf(line);

         if (i == -1 || i == lineList.size() - 1)

             return - 1;

         return lineList.get(i + 1);

     }

     private JavaFileManager fileManager;

     private ClassFile classFile;

     private SortedMap<Integer, SortedSet<Integer>> lineMap;

     private List<Integer> lineList;

     private String[] sourceLines;

 }