org.codehaus.groovy.classgen.asm.sc.StaticTypesClosureWriter Maven / Gradle / Ivy

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/*
 * Copyright 2003-2012 the original author or authors.
 *
 * Licensed 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.classgen.asm.sc;

import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.ast.ClassCodeVisitorSupport;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.expr.ClosureExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.classgen.asm.ClosureWriter;
import org.codehaus.groovy.classgen.asm.WriterController;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.transform.sc.StaticCompilationMetadataKeys;

import java.util.List;

/**
 * Writer responsible for generating closure classes in statically compiled mode.
 *
 * @author Cedric Champeau
 */
public class StaticTypesClosureWriter extends ClosureWriter {
    public StaticTypesClosureWriter(WriterController wc) {
        super(wc);
    }

    @Override
    protected ClassNode createClosureClass(final ClosureExpression expression, final int mods) {
        ClassNode closureClass = super.createClosureClass(expression, mods);
        List methods = closureClass.getMethods("call");
        List doCall = closureClass.getMethods("doCall");
        if (doCall.size() != 1) {
            throw new GroovyBugError("Expected to find one (1) doCall method on generated closure, but found " + doCall.size());
        }
        MethodTargetCompletionVisitor visitor = new MethodTargetCompletionVisitor(doCall.get(0));
        for (MethodNode method : methods) {
            visitor.visitMethod(method);
        }
        closureClass.putNodeMetaData(StaticCompilationMetadataKeys.STATIC_COMPILE_NODE, Boolean.TRUE);
        return closureClass;
    }

    private static class MethodTargetCompletionVisitor extends ClassCodeVisitorSupport {

        private final MethodNode doCallMethod;

        private MethodTargetCompletionVisitor(final MethodNode doCallMethod) {
            this.doCallMethod = doCallMethod;
        }

        @Override
        protected SourceUnit getSourceUnit() {
            return null;
        }

        @Override
        public void visitMethodCallExpression(final MethodCallExpression call) {
            super.visitMethodCallExpression(call);
            MethodNode mn = call.getMethodTarget();
            if (mn == null) {
                call.setMethodTarget(doCallMethod);
            }
        }
    }
}