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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2014, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.truffle.api.interop;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.nodes.Node;
final class ForeignAccessArguments extends Node {
static final Object[] EMPTY_ARGUMENTS_ARRAY = new Object[0];
static final int RECEIVER_INDEX = 0;
static final int RUNTIME_ARGUMENT_COUNT = 1;
@CompilationFinal private int previousLength = -2;
public Object[] executeCreate(Object receiver, Object... arguments) {
int length = profileLength(arguments.length);
Object[] objectArguments = new Object[RUNTIME_ARGUMENT_COUNT + length];
objectArguments[RECEIVER_INDEX] = receiver;
arraycopy(arguments, 0, objectArguments, RUNTIME_ARGUMENT_COUNT, length);
return objectArguments;
}
private int profileLength(int length) {
int returnLength = length;
if (previousLength != -1) {
if (previousLength == length) {
returnLength = previousLength;
} else {
CompilerDirectives.transferToInterpreterAndInvalidate();
if (previousLength == -2) {
previousLength = length;
} else {
previousLength = -1;
}
}
}
return returnLength;
}
private static void arraycopy(Object[] src, int srcPos, Object[] dest, int destPos, int length) {
for (int i = 0; i < length; i++) {
dest[destPos + i] = src[srcPos + i];
}
}
}
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