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/*
* 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.apache.drill.exec.compile;
import java.util.HashMap;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.TypePath;
/**
* A ClassVisitor that verifies the required call sequence described in
* http://asm.ow2.org/asm50/javadoc/user/org/objectweb/asm/ClassVisitor.html .
*
* <p>
* There is no CheckAnnotationVisitorFsm at this time. There is no
* CheckFieldVisitorFsm at this time.
*/
public class CheckClassVisitorFsm extends ClassVisitor {
/*
* From
* http://asm.ow2.org/asm50/javadoc/user/org/objectweb/asm/ClassVisitor.html
* "A visitor to visit a Java class. The methods of this class must be called
* in the following order: visit [ visitSource ] [ visitOuterClass ] (
* visitAnnotation | visitTypeAnnotation | visitAttribute )* ( visitInnerClass
* | visitField | visitMethod )* visitEnd."
*/
private final static FsmDescriptor fsmDescriptor = createFsmDescriptor();
private static FsmDescriptor createFsmDescriptor() {
final HashMap<String, Character> tokenMap = new HashMap<>();
tokenMap.put("visit", 'v');
tokenMap.put("visitSource", 'S');
tokenMap.put("visitOuterClass", 'O');
tokenMap.put("visitAnnotation", 'A');
tokenMap.put("visitTypeAnnotation", 'T');
tokenMap.put("visitAttribute", 'R');
tokenMap.put("visitInnerClass", 'I');
tokenMap.put("visitField", 'F');
tokenMap.put("visitMethod", 'M');
tokenMap.put("visitEnd", 'E');
return new FsmDescriptor(tokenMap, "vS?+O?+(A|T|R)*+(I|F|M)*+E", "visitEnd");
}
private final FsmCursor fsmCursor;
/**
* See {@link org.objectweb.asm.ClassVisitor#ClassVisitor(int, ClassVisitor)}.
*/
public CheckClassVisitorFsm(final int api, final ClassVisitor cv) {
super(api, cv);
fsmCursor = fsmDescriptor.createCursor();
}
@Override
public void visit(final int version, final int access, final String name,
final String signature, final String superName, final String[] interfaces) {
fsmCursor.transition("visit");
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public AnnotationVisitor visitAnnotation(final String desc,
final boolean visible) {
fsmCursor.transition("visitAnnotation");
final AnnotationVisitor annotationVisitor = super.visitAnnotation(desc,
visible);
return annotationVisitor; // TODO: add CheckAnnotationVisitorFsm
}
@Override
public void visitAttribute(final Attribute attr) {
fsmCursor.transition("visitAttribute");
super.visitAttribute(attr);
}
@Override
public void visitEnd() {
fsmCursor.transition("visitEnd");
fsmCursor.reset();
super.visitEnd();
}
@Override
public FieldVisitor visitField(final int access, final String name,
final String desc, final String signature, final Object value) {
fsmCursor.transition("visitField");
final FieldVisitor fieldVisitor = super.visitField(access, name, desc,
signature, value);
return fieldVisitor; // TODO: add CheckFieldVisitorFsm
}
@Override
public void visitInnerClass(final String name, final String outerName,
final String innerName, final int access) {
fsmCursor.transition("visitInnerClass");
super.visitInnerClass(name, outerName, innerName, access);
}
@Override
public MethodVisitor visitMethod(final int access, final String name,
final String desc, final String signature, final String[] exceptions) {
fsmCursor.transition("visitMethod");
final MethodVisitor methodVisitor = super.visitMethod(access, name, desc,
signature, exceptions);
return new CheckMethodVisitorFsm(api, methodVisitor);
}
@Override
public void visitOuterClass(final String owner, final String name,
final String desc) {
fsmCursor.transition("visitOuterClass");
super.visitOuterClass(owner, name, desc);
}
@Override
public void visitSource(final String source, final String debug) {
fsmCursor.transition("visitSource");
super.visitSource(source, debug);
}
@Override
public AnnotationVisitor visitTypeAnnotation(final int typeRef,
final TypePath typePath, final String desc, final boolean visible) {
fsmCursor.transition("visitTypeAnnotation");
final AnnotationVisitor annotationVisitor = super.visitTypeAnnotation(
typeRef, typePath, desc, visible);
return annotationVisitor; // TODO: add CheckAnnotationVisitorFsm
}
}
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