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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.transform.sc.transformers;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.BinaryExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.TupleExpression;
import org.codehaus.groovy.ast.expr.VariableExpression;
import org.codehaus.groovy.ast.stmt.EmptyStatement;
import org.codehaus.groovy.classgen.asm.MopWriter;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.codehaus.groovy.syntax.Token;
import org.codehaus.groovy.transform.stc.ExtensionMethodNode;
import org.codehaus.groovy.transform.stc.StaticTypeCheckingVisitor;
import org.codehaus.groovy.transform.stc.StaticTypesMarker;
import java.util.List;
import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static org.objectweb.asm.Opcodes.ACC_SYNTHETIC;
public class MethodCallExpressionTransformer {
private final static ClassNode DGM_CLASSNODE = ClassHelper.make(DefaultGroovyMethods.class);
private final StaticCompilationTransformer staticCompilationTransformer;
public MethodCallExpressionTransformer(StaticCompilationTransformer staticCompilationTransformer) {
this.staticCompilationTransformer = staticCompilationTransformer;
}
Expression transformMethodCallExpression(final MethodCallExpression expr) {
Expression trn = tryTransformIsToCompareIdentity(expr);
if (trn!=null) {
return trn;
}
ClassNode superCallReceiver = expr.getNodeMetaData(StaticTypesMarker.SUPER_MOP_METHOD_REQUIRED);
if (superCallReceiver!=null) {
return transformMethodCallExpression(transformToMopSuperCall(superCallReceiver, expr));
}
Expression objectExpression = expr.getObjectExpression();
ClassNode type = staticCompilationTransformer.getTypeChooser().resolveType(objectExpression, staticCompilationTransformer.getClassNode());
if (isCallOnClosure(expr)) {
FieldNode field = staticCompilationTransformer.getClassNode().getField(expr.getMethodAsString());
if (field != null) {
VariableExpression vexp = new VariableExpression(field);
MethodCallExpression result = new MethodCallExpression(
vexp,
"call",
staticCompilationTransformer.transform(expr.getArguments())
);
result.setImplicitThis(false);
result.setSourcePosition(expr);
result.setSafe(expr.isSafe());
result.setSpreadSafe(expr.isSpreadSafe());
result.setMethodTarget(StaticTypeCheckingVisitor.CLOSURE_CALL_VARGS);
return result;
}
}
if (type != null && type.isArray()) {
String method = expr.getMethodAsString();
ClassNode componentType = type.getComponentType();
if ("getAt".equals(method)) {
Expression arguments = expr.getArguments();
if (arguments instanceof TupleExpression) {
List argList = ((TupleExpression) arguments).getExpressions();
if (argList.size() == 1) {
Expression indexExpr = argList.get(0);
ClassNode argType = staticCompilationTransformer.getTypeChooser().resolveType(indexExpr, staticCompilationTransformer.getClassNode());
ClassNode indexType = ClassHelper.getWrapper(argType);
if (componentType.isEnum() && ClassHelper.Number_TYPE == indexType) {
// workaround for generated code in enums which use .next() returning a Number
indexType = ClassHelper.Integer_TYPE;
}
if (argType != null && ClassHelper.Integer_TYPE == indexType) {
BinaryExpression binaryExpression = new BinaryExpression(
objectExpression,
Token.newSymbol("[", indexExpr.getLineNumber(), indexExpr.getColumnNumber()),
indexExpr
);
binaryExpression.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, componentType);
return staticCompilationTransformer.transform(binaryExpression);
}
}
}
} else if ("putAt".equals(method)) {
Expression arguments = expr.getArguments();
if (arguments instanceof TupleExpression) {
List argList = ((TupleExpression) arguments).getExpressions();
if (argList.size() == 2) {
Expression indexExpr = argList.get(0);
Expression objExpr = argList.get(1);
ClassNode argType = staticCompilationTransformer.getTypeChooser().resolveType(indexExpr, staticCompilationTransformer.getClassNode());
if (argType != null && ClassHelper.Integer_TYPE == ClassHelper.getWrapper(argType)) {
BinaryExpression arrayGet = new BinaryExpression(
objectExpression,
Token.newSymbol("[", indexExpr.getLineNumber(), indexExpr.getColumnNumber()),
indexExpr
);
arrayGet.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, componentType);
BinaryExpression assignment = new BinaryExpression(
arrayGet,
Token.newSymbol("=", objExpr.getLineNumber(), objExpr.getColumnNumber()),
objExpr
);
return staticCompilationTransformer.transform(assignment);
}
}
}
}
}
return staticCompilationTransformer.superTransform(expr);
}
private static MethodCallExpression transformToMopSuperCall(final ClassNode superCallReceiver, final MethodCallExpression expr) {
MethodNode mn = expr.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
String mopName = MopWriter.getMopMethodName(mn, false);
MethodNode direct = new MethodNode(
mopName,
ACC_PUBLIC | ACC_SYNTHETIC,
mn.getReturnType(),
mn.getParameters(),
mn.getExceptions(),
EmptyStatement.INSTANCE
);
direct.setDeclaringClass(superCallReceiver);
MethodCallExpression result = new MethodCallExpression(
new VariableExpression("this"),
mopName,
expr.getArguments()
);
result.setImplicitThis(true);
result.setSpreadSafe(false);
result.setSafe(false);
result.setSourcePosition(expr);
result.setMethodTarget(direct);
return result;
}
private static boolean isCallOnClosure(final MethodCallExpression expr) {
return expr.isImplicitThis()
&& expr.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET) == StaticTypeCheckingVisitor.CLOSURE_CALL_VARGS
&& !"call".equals(expr.getMethodAsString());
}
/**
* Identifies a method call expression on {@link DefaultGroovyMethods#is(Object, Object)} and if recognized, transforms it into a {@link CompareIdentityExpression}.
* @param call a method call to be transformed
* @return null if the method call is not DGM#is, or {@link CompareIdentityExpression}
*/
private static Expression tryTransformIsToCompareIdentity(MethodCallExpression call) {
if (call.isSafe()) return null;
MethodNode methodTarget = call.getMethodTarget();
if (methodTarget instanceof ExtensionMethodNode && "is".equals(methodTarget.getName()) && methodTarget.getParameters().length==1) {
methodTarget = ((ExtensionMethodNode) methodTarget).getExtensionMethodNode();
ClassNode owner = methodTarget.getDeclaringClass();
if (DGM_CLASSNODE.equals(owner)) {
Expression args = call.getArguments();
if (args instanceof ArgumentListExpression) {
ArgumentListExpression arguments = (ArgumentListExpression) args;
List exprs = arguments.getExpressions();
if (exprs.size() == 1) {
CompareIdentityExpression cid = new CompareIdentityExpression(call.getObjectExpression(), exprs.get(0));
cid.setSourcePosition(call);
return cid;
}
}
}
}
return null;
}
}