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/*
* Copyright (C) 2010-2021 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.Map;
import static lombok.javac.Javac.*;
import lombok.javac.JavacTreeMaker.TypeTag;
import com.sun.source.tree.LabeledStatementTree;
import com.sun.source.tree.VariableTree;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.tree.TreeCopier;
import com.sun.tools.javac.tree.TreeScanner;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;
/**
* Makes a copy of any AST node, with some exceptions.
* Exceptions:<ul>
* <li>The symbol ('sym') of a copied variable isn't copied.
* <li>all labels are removed.
* </ul>
*
* The purpose of this class is to make a copy, and then the copy is attributed (resolution info is added). These exceptions
* are to work around apparent bugs (or at least inconsistencies) in javac sources.
*/
public class TreeMirrorMaker extends TreeCopier<Void> {
private final IdentityHashMap<JCTree, JCTree> originalToCopy = new IdentityHashMap<JCTree, JCTree>();
public TreeMirrorMaker(JavacTreeMaker maker, Context context) {
super(maker.getUnderlyingTreeMaker());
}
@Override public <T extends JCTree> T copy(T original) {
T copy = super.copy(original);
putIfAbsent(originalToCopy, original, copy);
return copy;
}
@Override public <T extends JCTree> T copy(T original, Void p) {
T copy = super.copy(original, p);
putIfAbsent(originalToCopy, original, copy);
return copy;
}
@Override public <T extends JCTree> List<T> copy(List<T> originals) {
List<T> copies = super.copy(originals);
if (originals != null) {
Iterator<T> it1 = originals.iterator();
Iterator<T> it2 = copies.iterator();
while (it1.hasNext()) putIfAbsent(originalToCopy, it1.next(), it2.next());
}
return copies;
}
@Override public <T extends JCTree> List<T> copy(List<T> originals, Void p) {
List<T> copies = super.copy(originals, p);
if (originals != null) {
Iterator<T> it1 = originals.iterator();
Iterator<T> it2 = copies.iterator();
while (it1.hasNext()) putIfAbsent(originalToCopy, it1.next(), it2.next());
}
return copies;
}
public Map<JCTree, JCTree> getOriginalToCopyMap() {
return Collections.unmodifiableMap(originalToCopy);
}
// Monitor the following issues when making changes here.
// - https://github.com/projectlombok/lombok/issues/278
// - https://github.com/projectlombok/lombok/issues/729
@Override public JCTree visitVariable(VariableTree node, Void p) {
JCVariableDecl original = node instanceof JCVariableDecl ? (JCVariableDecl) node : null;
JCVariableDecl copy = (JCVariableDecl) super.visitVariable(node, p);
if (original == null) return copy;
copy.sym = original.sym;
if (copy.sym != null) copy.type = original.type;
if (copy.type != null) {
boolean wipeSymAndType = copy.type.isErroneous();
if (!wipeSymAndType) {
TypeTag typeTag = TypeTag.typeTag(copy.type);
wipeSymAndType = (CTC_NONE.equals(typeTag) || CTC_ERROR.equals(typeTag) || CTC_UNKNOWN.equals(typeTag) || CTC_UNDETVAR.equals(typeTag));
}
if (wipeSymAndType) {
copy.sym = null;
copy.type = null;
} else {
if (original.vartype != null) {
copy.vartype.type = original.vartype.type;
original.vartype.accept(new TreeScanner() {
@Override public void scan(JCTree tree) {
super.scan(tree);
originalToCopy.get(tree).type = tree.type;
}
@Override public void visitSelect(JCFieldAccess tree) {
super.visitSelect(tree);
((JCFieldAccess) originalToCopy.get(tree)).sym = tree.sym;
}
});
}
}
}
return copy;
}
// Fix for NPE in HandleVal. See https://github.com/projectlombok/lombok/issues/372
// This and visitVariable is rather hacky but we're working around evident bugs or at least inconsistencies in javac.
@Override public JCTree visitLabeledStatement(LabeledStatementTree node, Void p) {
return node.getStatement().accept(this, p);
}
private <K, V> void putIfAbsent(Map<K, V> map, K key, V value) {
if (!map.containsKey(key)) {
map.put(key, value);
}
}
}
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