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/*
* Copyright (C) 2009-2021 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.eclipse.handlers;
import static lombok.core.handlers.HandlerUtil.*;
import static lombok.eclipse.handlers.EclipseHandlerUtil.*;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import lombok.ConfigurationKeys;
import lombok.Synchronized;
import lombok.core.AnnotationValues;
import lombok.core.HandlerPriority;
import lombok.core.AST.Kind;
import lombok.eclipse.DeferUntilPostDiet;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import lombok.eclipse.handlers.EclipseHandlerUtil.MemberExistsResult;
import lombok.spi.Provides;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.ArrayAllocationExpression;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.FieldReference;
import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.SynchronizedStatement;
import org.eclipse.jdt.internal.compiler.ast.ThisReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
/**
* Handles the {@code lombok.Synchronized} annotation for eclipse.
*/
@Provides
@DeferUntilPostDiet
@HandlerPriority(value = 1024) // 2^10; @NonNull must have run first, so that we wrap around the statements generated by it.
public class HandleSynchronized extends EclipseAnnotationHandler {
private static final char[] INSTANCE_LOCK_NAME = "$lock".toCharArray();
private static final char[] STATIC_LOCK_NAME = "$LOCK".toCharArray();
@Override public void preHandle(AnnotationValues annotation, Annotation source, EclipseNode annotationNode) {
EclipseNode methodNode = annotationNode.up();
if (methodNode == null || methodNode.getKind() != Kind.METHOD || !(methodNode.get() instanceof MethodDeclaration)) return;
MethodDeclaration method = (MethodDeclaration) methodNode.get();
if (method.isAbstract()) return;
createLockField(annotation, annotationNode, new boolean[] {method.isStatic()}, false);
}
public char[] createLockField(AnnotationValues annotation, EclipseNode annotationNode, boolean[] isStatic, boolean reportErrors) {
char[] lockName = annotation.getInstance().value().toCharArray();
Annotation source = (Annotation) annotationNode.get();
boolean autoMake = false;
if (lockName.length == 0) {
autoMake = true;
lockName = isStatic[0] ? STATIC_LOCK_NAME : INSTANCE_LOCK_NAME;
}
EclipseNode typeNode = upToTypeNode(annotationNode);
MemberExistsResult exists = MemberExistsResult.NOT_EXISTS;
if (typeNode != null && typeNode.get() instanceof TypeDeclaration) {
TypeDeclaration typeDecl = (TypeDeclaration) typeNode.get();
if (typeDecl.fields != null) for (FieldDeclaration def : typeDecl.fields) {
char[] fName = def.name;
if (fName == null) continue;
if (Arrays.equals(fName, lockName)) {
exists = getGeneratedBy(def) == null ? MemberExistsResult.EXISTS_BY_USER : MemberExistsResult.EXISTS_BY_LOMBOK;
boolean st = def.isStatic();
if (!st && isStatic[0]) {
if (reportErrors) annotationNode.addError(String.format("The field %s is non-static and thus cannot be used on this static method", new String(lockName)));
return null;
}
isStatic[0] = st;
break;
}
}
}
if (exists == MemberExistsResult.NOT_EXISTS) {
if (!autoMake) {
if (reportErrors) annotationNode.addError(String.format("The field %s does not exist", new String(lockName)));
return null;
}
FieldDeclaration fieldDecl = new FieldDeclaration(lockName, 0, -1);
setGeneratedBy(fieldDecl, source);
fieldDecl.declarationSourceEnd = -1;
fieldDecl.modifiers = (isStatic[0] ? Modifier.STATIC : 0) | Modifier.FINAL | Modifier.PRIVATE;
//We use 'new Object[0];' because unlike 'new Object();', empty arrays *ARE* serializable!
ArrayAllocationExpression arrayAlloc = new ArrayAllocationExpression();
setGeneratedBy(arrayAlloc, source);
arrayAlloc.dimensions = new Expression[] { makeIntLiteral("0".toCharArray(), source) };
arrayAlloc.type = new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, new long[] { 0, 0, 0 });
setGeneratedBy(arrayAlloc.type, source);
fieldDecl.type = new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, new long[] { 0, 0, 0 });
setGeneratedBy(fieldDecl.type, source);
fieldDecl.initialization = arrayAlloc;
// TODO temporary workaround for issue 290. https://github.com/projectlombok/lombok/issues/290
// injectFieldSuppressWarnings(annotationNode.up().up(), fieldDecl);
injectField(annotationNode.up().up(), fieldDecl);
}
return lockName;
}
@Override public void handle(AnnotationValues annotation, Annotation source, EclipseNode annotationNode) {
handleFlagUsage(annotationNode, ConfigurationKeys.SYNCHRONIZED_FLAG_USAGE, "@Synchronized");
int p1 = source.sourceStart -1;
int p2 = source.sourceStart -2;
long pos = (((long) p1) << 32) | p2;
EclipseNode methodNode = annotationNode.up();
if (methodNode == null || methodNode.getKind() != Kind.METHOD || !(methodNode.get() instanceof MethodDeclaration)) {
annotationNode.addError("@Synchronized is legal only on methods.");
return;
}
MethodDeclaration method = (MethodDeclaration) methodNode.get();
if (method.isAbstract()) {
annotationNode.addError("@Synchronized is legal only on concrete methods.");
return;
}
EclipseNode typeNode = upToTypeNode(annotationNode);
if (!isClassOrEnum(typeNode)) {
annotationNode.addError("@Synchronized is legal only on methods in classes and enums.");
return;
}
boolean[] isStatic = { method.isStatic() };
char[] lockName = createLockField(annotation, annotationNode, isStatic, true);
if (lockName == null) return;
if (method.statements == null) return;
Block block = new Block(0);
setGeneratedBy(block, source);
block.statements = method.statements;
// Positions for in-method generated nodes are special
block.sourceEnd = method.bodyEnd;
block.sourceStart = method.bodyStart;
Expression lockVariable;
if (isStatic[0]) {
char[][] n = getQualifiedInnerName(typeNode, lockName);
long[] ps = new long[n.length];
Arrays.fill(ps, pos);
lockVariable = new QualifiedNameReference(n, ps, p1, p2);
} else {
lockVariable = new FieldReference(lockName, pos);
ThisReference thisReference = new ThisReference(p1, p2);
setGeneratedBy(thisReference, source);
((FieldReference) lockVariable).receiver = thisReference;
}
setGeneratedBy(lockVariable, source);
method.statements = new Statement[] {
new SynchronizedStatement(lockVariable, block, 0, 0)
};
// Positions for in-method generated nodes are special
method.statements[0].sourceEnd = method.bodyEnd;
method.statements[0].sourceStart = method.bodyStart;
setGeneratedBy(method.statements[0], source);
methodNode.rebuild();
}
}