1 /* 2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.hotspot; 24 25 import java.io.FileNotFoundException; 26 import java.io.FileOutputStream; 27 import java.io.IOException; 28 import java.io.OutputStream; 29 import java.io.PrintStream; 30 import java.lang.management.ManagementFactory; 31 32 import org.graalvm.compiler.options.OptionKey; 33 import org.graalvm.compiler.options.OptionValues; 34 35 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime; 36 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider; 37 38 /** 39 * An option that encapsulates and configures a print stream. 40 */ 41 public class PrintStreamOptionKey extends OptionKey<String> { 42 43 public PrintStreamOptionKey() { 44 super(null); 45 } 46 47 /** 48 * Replace any instance of %p with an identifying name. Try to get it from the RuntimeMXBean 49 * name. 50 * 51 * @return the name of the file to log to 52 */ 53 private String getFilename(OptionValues options) { 54 String name = getValue(options); 55 if (name.contains("%p")) { 56 String runtimeName = ManagementFactory.getRuntimeMXBean().getName(); 57 try { 58 int index = runtimeName.indexOf('@'); 59 if (index != -1) { 60 long pid = Long.parseLong(runtimeName.substring(0, index)); 61 runtimeName = Long.toString(pid); 62 } 63 name = name.replaceAll("%p", runtimeName); 64 } catch (NumberFormatException e) { 65 66 } 67 } 68 return name; 69 } 70 71 /** 72 * An output stream that redirects to {@link HotSpotJVMCIRuntimeProvider#getLogStream()}. The 73 * {@link HotSpotJVMCIRuntimeProvider#getLogStream()} value is only accessed the first time an 74 * IO operation is performed on the stream. This is required to break a deadlock in early JVMCI 75 * initialization. 76 */ 77 static class DelayedOutputStream extends OutputStream { 78 private volatile OutputStream lazy; 79 80 private OutputStream lazy() { 81 if (lazy == null) { 82 synchronized (this) { 83 if (lazy == null) { 84 lazy = HotSpotJVMCIRuntime.runtime().getLogStream(); 85 } 86 } 87 } 88 return lazy; 89 } 90 91 @Override 92 public void write(byte[] b, int off, int len) throws IOException { 93 lazy().write(b, off, len); 94 } 95 96 @Override 97 public void write(int b) throws IOException { 98 lazy().write(b); 99 } 100 101 @Override 102 public void flush() throws IOException { 103 lazy().flush(); 104 } 105 106 @Override 107 public void close() throws IOException { 108 lazy().close(); 109 } 110 } 111 112 /** 113 * Gets the print stream configured by this option. If no file is configured, the print stream 114 * will output to HotSpot's {@link HotSpotJVMCIRuntimeProvider#getLogStream() log} stream. 115 */ 116 public PrintStream getStream(OptionValues options) { 117 if (getValue(options) != null) { 118 try { 119 final boolean enableAutoflush = true; 120 PrintStream ps = new PrintStream(new FileOutputStream(getFilename(options)), enableAutoflush); 121 /* 122 * Add the JVM and Java arguments to the log file to help identity it. 123 */ 124 String inputArguments = String.join(" ", ManagementFactory.getRuntimeMXBean().getInputArguments()); 125 ps.println("VM Arguments: " + inputArguments); 126 String cmd = System.getProperty("sun.java.command"); 127 if (cmd != null) { 128 ps.println("sun.java.command=" + cmd); 129 } 130 return ps; 131 } catch (FileNotFoundException e) { 132 throw new RuntimeException("couldn't open file: " + getValue(options), e); 133 } 134 } else { 135 return new PrintStream(new DelayedOutputStream()); 136 } 137 } 138 }