Mercurial > hg > graal-compiler
changeset 22777:7ffade01e1ff
Utility methods for spawning subprocesses in unit tests.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Thu, 08 Oct 2015 14:29:02 +0200 |
parents | 4899ae79cf25 |
children | 60d59d17d419 |
files | graal/com.oracle.graal.test/src/com/oracle/graal/test/SubprocessUtil.java |
diffstat | 1 files changed, 85 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.graal.test/src/com/oracle/graal/test/SubprocessUtil.java Thu Oct 08 14:29:02 2015 +0200 @@ -0,0 +1,85 @@ +/* + * Copyright (c) 2015, 2015, 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 com.oracle.graal.test; + +import java.io.File; +import java.io.IOException; +import java.nio.file.Files; +import java.util.List; + +/** + * Utility methods for spawning a VM in a subprocess during unit tests. + */ +public final class SubprocessUtil { + + private SubprocessUtil() { + } + + /** + * Gets the command line for the current process. + * + * @return the command line arguments for the current process or {@code null} if they are not + * available + */ + public static List<String> getProcessCommandLine() { + String processArgsFile = System.getenv().get("MX_SUBPROCESS_COMMAND_FILE"); + if (processArgsFile != null) { + try { + return Files.readAllLines(new File(processArgsFile).toPath()); + } catch (IOException e) { + } + } + return null; + } + + /** + * Gets the command line used to start the current Java VM, including all VM arguments, but not + * including the main class or any Java arguments. This can be used to spawn an identical VM, + * but running different Java code. + */ + public static List<String> getVMCommandLine() { + List<String> args = getProcessCommandLine(); + if (args == null) { + return null; + } else { + int index = findMainClassIndex(args); + return args.subList(0, index); + } + } + + private static int findMainClassIndex(List<String> commandLine) { + int i = 1; // Skip the java executable + while (i < commandLine.size()) { + String s = commandLine.get(i); + if (s.charAt(0) != '-') { + return i; + } else if (s.equals("-cp") || s.equals("-classpath")) { + i += 2; + } else { + i++; + } + } + throw new InternalError(); + } + +}