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jlechner |
/*
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Copyright (c) 2001, 2003 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.rmi.rmic;
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import java.io.InputStream;
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/**
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* Subclass of Compiler that can be subclassed to invoke a process to
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* do its work.
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*/
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public abstract class CompilerProcess extends Compiler
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{
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/** This is used to compute the command line for the process. */
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public abstract String[] computeArguments (String filename);
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/**
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* This is used to compute the command line for the process.
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* Most compilers typically arrange their arguments as in
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* <compiler name and arguments> <optional destination> <filename>.
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* This method builds an argument array out that. It should be used
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* to define computeArguments for those compilers that follow the
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* argument convention described above.
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*/
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public static String[] computeTypicalArguments(String[] compilerArgs,
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String destination, String filename)
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{
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return computeTypicalArguments(compilerArgs, null, destination, filename);
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}
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/**
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* This is used to compute the command line for the process.
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* Most compilers typically arrange their arguments as in
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* <compiler name and arguments> <optional destination> <filename>.
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* This method builds an argument array out that. It should be used
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* to define computeArguments for those compilers that follow the
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* argument convention described above.
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*/
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public static String[] computeTypicalArguments(String[] compilerArgs,
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String classpath,
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String destination,
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String filename)
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{
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/* length of compiler specific arguments */
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int len = compilerArgs.length;
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/* length of returned array of arguments */
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final int arglen = len + (classpath == null ? 0 : 2) +
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(destination == null ? 0 : 2) + 1;
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/* Allocate String array for computed arguments. */
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String [] args = new String[arglen];
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/* Fill in compiler arguments. */
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System.arraycopy(compilerArgs, 0, args, 0, len);
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/* Fill in classpath argument if necessary. */
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if (classpath != null)
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{
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args[len++] = "-classpath";
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args[len++] = classpath;
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}
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/* Fill in destination argument if necessary. */
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if (destination != null)
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{
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args[len++] = "-d";
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args[len++] = destination;
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}
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/* Fill in filename */
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args[arglen - 1] = filename;
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return args;
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}
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public void compile (String name) throws Exception
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{
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String[] args = computeArguments (name);
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Process p = Runtime.getRuntime ().exec (args);
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/* Print compiler output to System.out. Do this asynchronously so
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that the compiler never blocks writing to its stdout. */
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{
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final InputStream procin = p.getInputStream();
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final Thread copier = new Thread()
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{
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public void run()
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{
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try
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{
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for (int ch = procin.read(); ch != -1; ch = procin.read())
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System.out.print((char) ch);
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}
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catch (java.io.IOException _)
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{
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}
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}
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};
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copier.start();
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}
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/* Collect compiler error output in a buffer.
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* If compilation fails, it will be used for an error message.
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*/
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StringBuffer stderr = new StringBuffer();
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InputStream procerr = p.getErrorStream();
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for (int ch = procerr.read(); ch != -1; ch = procerr.read())
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stderr.append((char) ch);
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int result;
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while (true)
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{
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try
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{
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result = p.waitFor ();
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break;
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}
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catch (InterruptedException _)
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{
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}
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}
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if (result != 0)
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{
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// FIXME: wrong exception class.
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throw new Exception ("compiler exited with status: " + result,
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new RMICException(stderr.toString()));
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}
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}
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}
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