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/**
* Copyright 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package jogamp.common.os;
import com.jogamp.common.nio.Buffers;
import com.jogamp.common.os.MachineDescription;
import com.jogamp.common.os.NativeLibrary;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
/**
* Runtime MachineDescription
*/
public class MachineDescriptionRuntime {
public static MachineDescription getMachineDescription(boolean is32BitByCPUArch) {
boolean libsLoaded = true;
try {
NativeLibrary.ensureNativeLibLoaded();
} catch (UnsatisfiedLinkError err) {
libsLoaded = false;
}
if(libsLoaded) {
int pointerSizeInBytes = getPointerSizeInBytesImpl();
switch(pointerSizeInBytes) {
case 4:
case 8:
break;
default:
throw new RuntimeException("Unsupported pointer size "+pointerSizeInBytes+"bytes, please implement.");
}
final long pageSizeL = getPageSizeInBytesImpl();
if(Integer.MAX_VALUE < pageSizeL) {
throw new InternalError("PageSize exceeds integer value: " + pageSizeL);
}
return getMachineDescriptionImpl(pointerSizeInBytes, (int) pageSizeL);
} else {
if(is32BitByCPUArch) {
return new MachineDescription32Bit();
} else {
return new MachineDescription64Bit();
}
}
}
private static MachineDescription getMachineDescriptionImpl(int pointerSize, int pageSize) {
// size: char, short, int, long, float, double, pointer
// alignment: int8, int16, int32, int64, char, short, int, long, float, double, pointer
return new MachineDescription(
true /* runtime validated */,
isLittleEndianImpl(),
getSizeOfCharImpl(), getSizeOfShortImpl(), getSizeOfIntImpl(), getSizeOfLongImpl(),
getSizeOfFloatImpl(), getSizeOfDoubleImpl(), pointerSize, pageSize,
getAlignmentInt8Impl(), getAlignmentInt16Impl(), getAlignmentInt32Impl(), getAlignmentInt64Impl(),
getAlignmentCharImpl(), getAlignmentShortImpl(), getAlignmentIntImpl(), getAlignmentLongImpl(),
getAlignmentFloatImpl(), getAlignmentDoubleImpl(), getAlignmentPointerImpl());
}
private static boolean isLittleEndianImpl() {
ByteBuffer tst_b = Buffers.newDirectByteBuffer(Buffers.SIZEOF_INT); // 32bit in native order
IntBuffer tst_i = tst_b.asIntBuffer();
ShortBuffer tst_s = tst_b.asShortBuffer();
tst_i.put(0, 0x0A0B0C0D);
return 0x0C0D == tst_s.get(0);
}
private static native int getPointerSizeInBytesImpl();
private static native long getPageSizeInBytesImpl();
private static native int getAlignmentInt8Impl();
private static native int getAlignmentInt16Impl();
private static native int getAlignmentInt32Impl();
private static native int getAlignmentInt64Impl();
private static native int getAlignmentCharImpl();
private static native int getAlignmentShortImpl();
private static native int getAlignmentIntImpl();
private static native int getAlignmentLongImpl();
private static native int getAlignmentPointerImpl();
private static native int getAlignmentFloatImpl();
private static native int getAlignmentDoubleImpl();
private static native int getSizeOfCharImpl();
private static native int getSizeOfShortImpl();
private static native int getSizeOfIntImpl();
private static native int getSizeOfLongImpl();
private static native int getSizeOfPointerImpl();
private static native int getSizeOfFloatImpl();
private static native int getSizeOfDoubleImpl();
}
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