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/**
* Copyright 2013 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.os.DynamicLinker;
import com.jogamp.common.util.LongObjectHashMap;
import com.jogamp.common.util.SecurityUtil;
/* pp */ abstract class DynamicLinkerImpl implements DynamicLinker {
//
// Package private scope of class w/ protected native code access
// and sealed jogamp.common.* package definition
// ensuring no abuse via subclassing.
//
private final Object secSync = new Object();
private boolean allLinkPermissionGranted = false;
/**
* @throws SecurityException if user is not granted global access
*/
public final void claimAllLinkPermission() throws SecurityException {
synchronized( secSync ) {
allLinkPermissionGranted = true;
}
}
/**
* @throws SecurityException if user is not granted global access
*/
public final void releaseAllLinkPermission() throws SecurityException {
synchronized( secSync ) {
allLinkPermissionGranted = false;
}
}
private final void checkLinkPermission(final String pathname) throws SecurityException {
synchronized( secSync ) {
if( !allLinkPermissionGranted ) {
SecurityUtil.checkLinkPermission(pathname);
}
}
}
private final void checkLinkPermission(final long libraryHandle) throws SecurityException {
synchronized( secSync ) {
if( !allLinkPermissionGranted ) {
final LibRef libRef = getLibRef( libraryHandle );
if( null == libRef ) {
throw new IllegalArgumentException("Library handle 0x"+Long.toHexString(libraryHandle)+" unknown.");
}
SecurityUtil.checkLinkPermission(libRef.getName());
}
}
}
private final void checkAllLinkPermission() throws SecurityException {
synchronized( secSync ) {
if( !allLinkPermissionGranted ) {
SecurityUtil.checkAllLinkPermission();
}
}
}
@Override
public final long openLibraryGlobal(final String pathname, final boolean debug) throws SecurityException {
checkLinkPermission(pathname);
final long handle = openLibraryGlobalImpl(pathname);
if( 0 != handle ) {
final LibRef libRef = incrLibRefCount(handle, pathname);
if( DEBUG || debug ) {
System.err.println("DynamicLinkerImpl.openLibraryGlobal \""+pathname+"\": 0x"+Long.toHexString(handle)+" -> "+libRef+")");
}
} else if ( DEBUG || debug ) {
System.err.println("DynamicLinkerImpl.openLibraryGlobal \""+pathname+"\" failed, error: "+getLastError());
}
return handle;
}
protected abstract long openLibraryGlobalImpl(final String pathname) throws SecurityException;
@Override
public final long openLibraryLocal(final String pathname, final boolean debug) throws SecurityException {
checkLinkPermission(pathname);
final long handle = openLibraryLocalImpl(pathname);
if( 0 != handle ) {
final LibRef libRef = incrLibRefCount(handle, pathname);
if( DEBUG || debug ) {
System.err.println("DynamicLinkerImpl.openLibraryLocal \""+pathname+"\": 0x"+Long.toHexString(handle)+" -> "+libRef+")");
}
} else if ( DEBUG || debug ) {
System.err.println("DynamicLinkerImpl.openLibraryLocal \""+pathname+"\" failed, error: "+getLastError());
}
return handle;
}
protected abstract long openLibraryLocalImpl(final String pathname) throws SecurityException;
@Override
public final long lookupSymbolGlobal(final String symbolName) throws SecurityException {
checkAllLinkPermission();
final long addr = lookupSymbolGlobalImpl(symbolName);
if(DEBUG_LOOKUP) {
System.err.println("DynamicLinkerImpl.lookupSymbolGlobal("+symbolName+") -> 0x"+Long.toHexString(addr));
}
return addr;
}
protected abstract long lookupSymbolGlobalImpl(final String symbolName) throws SecurityException;
@Override
public final long lookupSymbol(final long libraryHandle, final String symbolName) throws SecurityException, IllegalArgumentException {
checkLinkPermission(libraryHandle);
final long addr = lookupSymbolLocalImpl(libraryHandle, symbolName);
if(DEBUG_LOOKUP) {
System.err.println("DynamicLinkerImpl.lookupSymbol(0x"+Long.toHexString(libraryHandle)+", "+symbolName+") -> 0x"+Long.toHexString(addr));
}
return addr;
}
protected abstract long lookupSymbolLocalImpl(final long libraryHandle, final String symbolName) throws SecurityException;
@Override
public final void closeLibrary(final long libraryHandle, final boolean debug) throws SecurityException, IllegalArgumentException {
final LibRef libRef = decrLibRefCount( libraryHandle );
if( null != libRef ) {
checkLinkPermission(libRef.getName());
} // else null libRef is OK for global lookup
if( DEBUG || debug ) {
System.err.println("DynamicLinkerImpl.closeLibrary(0x"+Long.toHexString(libraryHandle)+" -> "+libRef+")");
}
if( 0 != libraryHandle ) {
closeLibraryImpl(libraryHandle);
}
}
protected abstract void closeLibraryImpl(final long libraryHandle) throws SecurityException;
private static final LongObjectHashMap libHandle2Name = new LongObjectHashMap( 16 /* initialCapacity */ );
static final class LibRef {
LibRef(final String name) {
this.name = name;
this.refCount = 1;
}
final int incrRefCount() { return ++refCount; }
final int decrRefCount() { return --refCount; }
final int getRefCount() { return refCount; }
final String getName() { return name; }
@Override
public final String toString() { return "LibRef["+name+", refCount "+refCount+"]"; }
private final String name;
private int refCount;
}
private final LibRef getLibRef(final long handle) {
synchronized( libHandle2Name ) {
return (LibRef) libHandle2Name.get(handle);
}
}
private final LibRef incrLibRefCount(final long handle, final String libName) {
synchronized( libHandle2Name ) {
LibRef libRef = getLibRef(handle);
if( null == libRef ) {
libRef = new LibRef(libName);
libHandle2Name.put(handle, libRef);
} else {
libRef.incrRefCount();
}
if(DEBUG) {
System.err.println("DynamicLinkerImpl.incrLibRefCount 0x"+Long.toHexString(handle)+ " -> "+libRef+", libs loaded "+libHandle2Name.size());
}
return libRef;
}
}
private final LibRef decrLibRefCount(final long handle) {
synchronized( libHandle2Name ) {
final LibRef libRef = getLibRef(handle);
if( null != libRef ) {
if( 0 == libRef.decrRefCount() ) {
libHandle2Name.remove(handle);
}
}
if(DEBUG) {
System.err.println("DynamicLinkerImpl.decrLibRefCount 0x"+Long.toHexString(handle)+ " -> "+libRef+", libs loaded "+libHandle2Name.size());
}
return libRef;
}
}
}
