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Original file line number Diff line number Diff line change
@@ -0,0 +1,93 @@
/*
* Copyright (c) 2025, 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.espresso.shared.lookup;

import com.oracle.truffle.espresso.classfile.Constants;
import com.oracle.truffle.espresso.shared.meta.ModifiersProvider;

/**
* Provides a simple way of filtering elements with {@linkplain ModifiersProvider modifiers} (such
* as classes, methods or fields), based on their declared flags.
*/
public final class LookupMode {
public static final LookupMode ALL = new LookupMode(0, 0);
public static final LookupMode INSTANCE_ONLY = new LookupMode(0, Constants.ACC_STATIC);
public static final LookupMode STATIC_ONLY = new LookupMode(Constants.ACC_STATIC, 0);
public static final LookupMode NON_STATIC_NON_PRIVATE = new LookupMode(0, Constants.ACC_STATIC | Constants.ACC_PRIVATE);
public static final LookupMode PUBLIC_NON_STATIC = new LookupMode(Constants.ACC_PUBLIC, Constants.ACC_STATIC);

private final int positives;
private final int negatives;

/**
* Creates a new element filter.
*
* @param positives The flags that need to be set
* @param negatives The flags that must not be set.
*/
public LookupMode(int positives, int negatives) {
assert (positives & negatives) == 0 : "Empty mode: +" + Integer.toHexString(positives) + " and -" + Integer.toHexString(negatives);
this.positives = positives;
this.negatives = negatives;
}

/**
* Returns whether the given element is accepted by {@code this} filter. If {@code m} is
* {@code null}, then this method returns {@code false}.
*/
public boolean include(ModifiersProvider m) {
if (m == null) {
return false;
}
int flags = m.getModifiers();
return hasPositives(flags) && hasNoNegatives(flags);
}

/**
* Combines this filter with another.
* <p>
* Calling the resulting {@link #include(ModifiersProvider e)} is equivalent to
* {@code this.include(e) && other.include(e)}.
*/
public LookupMode combine(LookupMode other) {
int newPositives = this.positives | other.negatives;
int newNegatives = this.negatives | other.negatives;
if (newPositives == positives && newNegatives == negatives) {
return this;
}
if (newPositives == other.positives && newNegatives == other.negatives) {
return other;
}
return new LookupMode(newPositives, newNegatives);
}

private boolean hasPositives(int flags) {
return (flags & positives) == positives;
}

private boolean hasNoNegatives(int flags) {
return (flags & negatives) == 0;
}
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
/*
* Copyright (c) 2025, 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.espresso.shared.lookup;

import java.io.Serial;

import com.oracle.truffle.espresso.shared.meta.MethodAccess;

/**
* Checked exception thrown by the {@link MethodLookup} helper class when method lookup succeeds,
* but direct invocation of the resulting method should trigger
* {@link IncompatibleClassChangeError}.
* <p>
* Use of a checked exceptions should ensure that the result is not accidentally passed along or
* invoked without consideration.
*/
public final class LookupSuccessInvocationFailure extends Exception {
@Serial private static final long serialVersionUID = 1794882806666028197L;

LookupSuccessInvocationFailure(MethodAccess<?, ?, ?> m) {
super(null, null);
this.m = m;
}

private final transient MethodAccess<?, ?, ?> m;

/**
* Obtain the result of method lookup.
*/
@SuppressWarnings("unchecked")
public <M extends MethodAccess<?, ?, ?>> M getResult() {
return (M) m;
}

@SuppressWarnings("sync-override")
@Override
public Throwable fillInStackTrace() {
return this;
}
}
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