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/*
* Copyright (c) 2018, 2022, 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.
*
* 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 lib.jdb;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import jdk.test.lib.JDKToolFinder;
import jdk.test.lib.Utils;
import jdk.test.lib.process.StreamPumper;
public class Jdb implements AutoCloseable {
public Jdb(String... args) {
ProcessBuilder pb = new ProcessBuilder(JDKToolFinder.getTestJDKTool("jdb"));
pb.command().add("-J-Duser.language=en");
pb.command().add("-J-Duser.country=US");
pb.command().addAll(Arrays.asList(args));
try {
jdb = pb.start();
} catch (IOException ex) {
throw new RuntimeException("failed to launch pdb", ex);
}
try {
StreamPumper stdout = new StreamPumper(jdb.getInputStream());
StreamPumper stderr = new StreamPumper(jdb.getErrorStream());
stdout.addPump(new StreamPumper.StreamPump(outputHandler));
stderr.addPump(new StreamPumper.StreamPump(outputHandler));
stdout.process();
stderr.process();
inputWriter = new PrintWriter(jdb.getOutputStream(), true);
} catch (Throwable ex) {
// terminate jdb if something went wrong
jdb.destroy();
throw ex;
}
}
private final Process jdb;
private final OutputHandler outputHandler = new OutputHandler();
private final PrintWriter inputWriter;
private final List<String> jdbOutput = new LinkedList<>();
private static final String lineSeparator = System.getProperty("line.separator");
// wait time before check jdb output (in ms)
private static final long sleepTime = 1000;
// max time to wait for jdb output (in ms)
private static final long timeout = Utils.adjustTimeout(60000);
// pattern for message of a breakpoint hit
public static final String BREAKPOINT_HIT = "Breakpoint hit:";
// pattern for message of an application exit
public static final String APPLICATION_EXIT = "The application exited";
// pattern for message of an application disconnect
public static final String APPLICATION_DISCONNECTED = "The application has been disconnected";
@Override
public void close() throws Exception {
shutdown();
}
// waits until the process shutdown or crash
public boolean waitFor(long timeout, TimeUnit unit) {
try {
return jdb.waitFor(Utils.adjustTimeout(timeout), unit);
} catch (InterruptedException e) {
return false;
}
}
public void shutdown() {
// shutdown jdb
if (jdb.isAlive()) {
try {
quit();
// wait some time after the command for the process termination
waitFor(10, TimeUnit.SECONDS);
} finally {
if (jdb.isAlive()) {
jdb.destroy();
}
}
}
}
// waits until string {@pattern} appears in the jdb output, within the last {@code lines} lines.
/* Comment from original /test/jdk/com/sun/jdi/ShellScaffold.sh
# Now we have to wait for the next jdb prompt. We wait for a pattern
# to appear in the last line of jdb output. Normally, the prompt is
#
# 1) ^main[89] @
# or
# 1) ^[89] @
# for virtual threads
#
# where ^ means start of line, and @ means end of file with no end of line
# and 89 is the current command counter. But we have complications e.g.,
# the following jdb output can appear:
#
# 2) a[89] = 10
#
# The above form is an array assignment and not a prompt.
#
# 3) ^main[89] main[89] ...
#
# This occurs if the next cmd is one that causes no jdb output, e.g.,
# 'trace methods'.
#
# 4) ^main[89] [main[89]] .... > @
#
# jdb prints a > as a prompt after something like a cont.
# Thus, even though the above is the last 'line' in the file, it
# isn't the next prompt we are waiting for after the cont completes.
# HOWEVER, sometimes we see this for a cont command:
#
# ^main[89] $
# <lines output for hitting a bkpt>
#
# 5) ^main[89] > @
#
# i.e., the > prompt comes out AFTER the prompt we we need to wait for.
*/
// compile regexp once
private final static String promptPattern = "?\\[[1-9][0-9]*\\] [ >]*$";
final static Pattern PROMPT_REGEXP = Pattern.compile(promptPattern);
public List<String> waitForPrompt(int lines, boolean allowExit) {
return waitForPrompt(lines, allowExit, PROMPT_REGEXP);
}
// jdb prompt when debuggee is not started and is not suspended after breakpoint
private static final String SIMPLE_PROMPT = "> ";
public List<String> waitForSimplePrompt(int lines, boolean allowExit) {
return waitForPrompt(lines, allowExit, Pattern.compile(SIMPLE_PROMPT));
}
private List<String> waitForPrompt(int lines, boolean allowExit, Pattern promptRegexp) {
long startTime = System.currentTimeMillis();
while (System.currentTimeMillis() - startTime < timeout) {
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
// ignore
}
synchronized (outputHandler) {
if (!outputHandler.updated()) {
try {
outputHandler.wait(sleepTime);
} catch (InterruptedException e) {
// ignore
}
} else {
// if something appeared in the jdb output, reset the timeout
startTime = System.currentTimeMillis();
}
}
List<String> reply = outputHandler.get();
if ((promptRegexp.flags() & Pattern.MULTILINE) > 0) {
String replyString = reply.stream().collect(Collectors.joining(lineSeparator));
if (promptRegexp.matcher(replyString).find()) {
logJdb(reply);
return outputHandler.reset();
}
} else {
for (String line : reply.subList(Math.max(0, reply.size() - lines), reply.size())) {
if (promptRegexp.matcher(line).find()) {
logJdb(reply);
return outputHandler.reset();
}
}
}
if (!jdb.isAlive()) {
// ensure we get the whole output
reply = outputHandler.reset();
logJdb(reply);
if (!allowExit) {
throw new RuntimeException("waitForPrompt timed out after " + (timeout/1000)
+ " seconds, looking for '" + promptRegexp.pattern() + "', in " + lines + " lines");
}
return reply;
}
}
// timeout
logJdb(outputHandler.get());
throw new RuntimeException("waitForPrompt timed out after " + (timeout/1000)
+ " seconds, looking for '" + promptRegexp.pattern() + "', in " + lines + " lines");
}
public List<String> command(JdbCommand cmd) {
if (!jdb.isAlive()) {
if (cmd.allowExit) {
// return remaining output
return outputHandler.reset();
}
throw new RuntimeException("Attempt to send command '" + cmd.cmd + "' to terminated jdb");
}
log("> " + cmd.cmd);
inputWriter.println(cmd.cmd);
if (inputWriter.checkError()) {
throw new RuntimeException("Unexpected IO error while writing command '" + cmd.cmd + "' to jdb stdin stream");
}
return waitForPrompt(1, cmd.allowExit, cmd.waitForPattern);
}
public List<String> command(String cmd) {
return command(new JdbCommand(cmd));
}
// sends "cont" command up to maxTimes until debuggee exit
public void contToExit(int maxTimes) {
boolean exited = false;
JdbCommand cont = JdbCommand.cont().allowExit();
for (int i = 0; i < maxTimes && jdb.isAlive(); i++) {
String reply = command(cont).stream().collect(Collectors.joining(lineSeparator));
if (reply.contains(APPLICATION_EXIT)) {
exited = true;
break;
}
}
if (!exited && jdb.isAlive()) {
throw new RuntimeException("Debuggee did not exit after " + maxTimes + " commands");
}
}
// quits jdb by using "quit" command
public void quit() {
command(JdbCommand.quit());
}
private void log(String s) {
System.out.println(s);
}
private void logJdb(List<String> reply) {
jdbOutput.addAll(reply);
reply.forEach(s -> log("[jdb] " + s));
}
// returns the whole jdb output as a string
public String getJdbOutput() {
return jdbOutput.stream().collect(Collectors.joining(lineSeparator));
}
// handler for out/err of the pdb process
private class OutputHandler extends OutputStream {
// there are 2 buffers:
// outStream - data from the process stdout/stderr after last get() call
// cachedData - data collected at get(), cleared by reset()
private final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
// if the last line in the reply had EOL, the list's last element is empty
private final List<String> cachedData = new ArrayList<>();
@Override
public synchronized void write(int b) throws IOException {
outStream.write((byte)(b & 0xFF));
notifyAll();
}
@Override
public synchronized void write(byte b[], int off, int len) throws IOException {
outStream.write(b, off, len);
notifyAll();
}
// gets output after the last {@ reset}.
// returned data becomes invalid after {@reset}.
public synchronized List<String> get() {
if (updated()) {
// we don't want to discard empty lines
String[] newLines = outStream.toString().split("\\R", -1);
if (!cachedData.isEmpty()) {
// concat the last line if previous data had no EOL
newLines[0] = cachedData.remove(cachedData.size()-1) + newLines[0];
}
cachedData.addAll(Arrays.asList(newLines));
outStream.reset();
}
return Collections.unmodifiableList(cachedData);
}
// clears last replay (does not touch replyStream)
// returns list as the last get()
public synchronized List<String> reset() {
List<String> result = new ArrayList<>(cachedData);
cachedData.clear();
return result;
}
// tests if there are some new data after the last lastReply() call
public synchronized boolean updated() {
return outStream.size() > 0;
}
}
}
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