/*
* Copyright 2002-2003 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.tools.javap;
import java.util.*;
import java.io.*;
/**
* Entry point for javap, class file disassembler.
*
* @author Sucheta Dambalkar (Adopted code from old javap)
*/
public class Main {
private Vector<String> classList = new Vector<String>();
private PrintWriter out;
JavapEnvironment env = new JavapEnvironment();
private static boolean errorOccurred = false;
private static final String progname = "javap";
public Main(PrintWriter out){
this.out = out;
}
public static void main(String argv[]) {
entry(argv);
if (errorOccurred) {
System.exit(1);
}
}
/**
* Entry point for tool if you don't want System.exit() called.
*/
public static void entry(String argv[]) {
PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
try {
Main jpmain = new Main(out);
jpmain.perform(argv);
} finally {
out.close();
}
}
/**
* Process the arguments and perform the desired action
*/
private void perform(String argv[]) {
if (parseArguments(argv)) {
displayResults();
}
}
private void error(String msg) {
errorOccurred = true;
System.err.println(msg);
System.err.flush();
}
/**
* Print usage information
*/
private void usage() {
java.io.PrintStream out = System.out;
out.println("Usage: " + progname + " <options> <classes>...");
out.println();
out.println("where options include:");
out.println(" -c Disassemble the code");
out.println(" -classpath <pathlist> Specify where to find user class files");
out.println(" -extdirs <dirs> Override location of installed extensions");
out.println(" -help Print this usage message");
out.println(" -J<flag> Pass <flag> directly to the runtime system");
out.println(" -l Print line number and local variable tables");
out.println(" -public Show only public classes and members");
out.println(" -protected Show protected/public classes and members");
out.println(" -package Show package/protected/public classes");
out.println(" and members (default)");
out.println(" -private Show all classes and members");
out.println(" -s Print internal type signatures");
out.println(" -bootclasspath <pathlist> Override location of class files loaded");
out.println(" by the bootstrap class loader");
out.println(" -verbose Print stack size, number of locals and args for methods");
out.println(" If verifying, print reasons for failure");
out.println();
}
/**
* Parse the command line arguments.
* Set flags, construct the class list and create environment.
*/
private boolean parseArguments(String argv[]) {
for (int i = 0 ; i < argv.length ; i++) {
String arg = argv[i];
if (arg.startsWith("-")) {
if (arg.equals("-l")) {
env.showLineAndLocal = true;
} else if (arg.equals("-private") || arg.equals("-p")) {
env.showAccess = env.PRIVATE;
} else if (arg.equals("-package")) {
env.showAccess = env.PACKAGE;
} else if (arg.equals("-protected")) {
env.showAccess = env.PROTECTED;
} else if (arg.equals("-public")) {
env.showAccess = env.PUBLIC;
} else if (arg.equals("-c")) {
env.showDisassembled = true;
} else if (arg.equals("-s")) {
env.showInternalSigs = true;
} else if (arg.equals("-verbose")) {
env.showVerbose = true;
} else if (arg.equals("-v")) {
env.showVerbose = true;
} else if (arg.equals("-h")) {
error("-h is no longer available - use the 'javah' program");
return false;
} else if (arg.equals("-verify")) {
error("-verify is no longer available - use 'java -verify'");
return false;
} else if (arg.equals("-verify-verbose")) {
error("-verify is no longer available - use 'java -verify'");
return false;
} else if (arg.equals("-help")) {
usage();
return false;
} else if (arg.equals("-classpath")) {
if ((i + 1) < argv.length) {
env.classPathString = argv[++i];
} else {
error("-classpath requires argument");
usage();
return false;
}
} else if (arg.equals("-bootclasspath")) {
if ((i + 1) < argv.length) {
env.bootClassPathString = argv[++i];
} else {
error("-bootclasspath requires argument");
usage();
return false;
}
} else if (arg.equals("-extdirs")) {
if ((i + 1) < argv.length) {
env.extDirsString = argv[++i];
} else {
error("-extdirs requires argument");
usage();
return false;
}
} else if (arg.equals("-all")) {
env.showallAttr = true;
} else {
error("invalid flag: " + arg);
usage();
return false;
}
} else {
classList.addElement(arg);
env.nothingToDo = false;
}
}
if (env.nothingToDo) {
System.out.println("No classes were specified on the command line. Try -help.");
errorOccurred = true;
return false;
}
return true;
}
/**
* Display results
*/
private void displayResults() {
for (int i = 0; i < classList.size() ; i++ ) {
String Name = classList.elementAt(i);
InputStream classin = env.getFileInputStream(Name);
try {
JavapPrinter printer = new JavapPrinter(classin, out, env);
printer.print(); // actual do display
} catch (IllegalArgumentException exc) {
error(exc.getMessage());
}
}
}
}