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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.archquery;
/**
* Java command line tool to return the CPU architecture of the host java VM.
*
* The goal is to be able to launch SWT based applications (DDMS, Traceview, Android) on any
* type of OS.
*
* Because a 64 bit OS can run a 32 bit Virtual Machine, we need to query the VM itself to know
* whether it's 32 or 64 bit to detect which swt.jar it should use (it contains native libraries).
* Simply querying the OS is not enough.
*
* The other problem is that once a VM is launched it is impossible to change its classpath to
* point the VM to the correct version of swt.jar.
*
* The solution is this small command line tool, running in the VM, and returning the value of
* the 'os.arch' property. Based on the returned value, the script launching the SWT based
* applications will configure the Java VM with the path to the correct swt.jar
*
* Because different VMs return different values for 32 and 64 bit version of x86 CPUs, the program
* handles all the possible values and normalize the returned value.
*
* At this time, the normalized values are:
* x86: 32 bit x86
* x86_64: 64 bit x86
* ppc: PowerPC (WARNING: the SDK doesn't actually support this architecture).
*
*
*/
public final class Main {
public static void main(String[] args) {
for (String arg : args) {
System.out.println(System.getProperty(arg));
}
if (args.length == 0) {
// Values listed from http://lopica.sourceforge.net/os.html
String arch = System.getProperty("os.arch");
if (arch.equalsIgnoreCase("x86_64") || arch.equalsIgnoreCase("amd64")) {
System.out.print("x86_64");
} else if (arch.equalsIgnoreCase("x86")
|| arch.equalsIgnoreCase("i386")
|| arch.equalsIgnoreCase("i686")) {
System.out.print("x86");
} else if (arch.equalsIgnoreCase("ppc") || arch.equalsIgnoreCase("PowerPC")) {
System.out.print("ppc");
} else {
System.out.print(arch);
}
}
}
}
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