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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
*
* 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 io.fd.hc2vpp.docs.core;
import static java.lang.String.format;
import java.util.HashSet;
import java.util.Set;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MethodPluginCoverageVisitor extends MethodVisitor {
private static final Logger LOG = LoggerFactory.getLogger(MethodPluginCoverageVisitor.class);
private final String currentClass;
private final Set<PluginMethodReference> foundReferences;
private final String reference;
private final Set<String> allreadyProcessedLocal;
public MethodPluginCoverageVisitor(String currentClass, Set<PluginMethodReference> foundReferences,
String reference,
Set<String> allreadyProcessedLocal) {
super(Opcodes.ASM5);
this.currentClass = currentClass;
this.foundReferences = foundReferences;
this.reference = reference;
// if nonnull then reuse
this.allreadyProcessedLocal = allreadyProcessedLocal == null
? new HashSet<>()
: allreadyProcessedLocal;
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean isInterface) {
final String normalizedOwner = owner.replace(";", "").replace("[L", "");
if (normalizedOwner.contains(reference)) {
// reference was found directly in method code
foundReferences.add(new PluginMethodReference(currentClass, owner, name));
} else {
if (normalizedOwner.contains("io/fd")) {
// filter just our method to reduce scope
if (!normalizedOwner.equals(currentClass)) {
LOG.debug("Processing non-current {}.{}()", normalizedOwner, name);
// method call is from different class than currently processed one
ClassReader classReader = CoverageScanner.loadClass(normalizedOwner);
classReader.accept(new MethodDelegatingClassVisitor(normalizedOwner, name, reference,
foundReferences,
allreadyProcessedLocal), ClassReader.SKIP_DEBUG);
} else {
LOG.debug("Processing current {}.{}()", normalizedOwner, name);
// other methods in same class that are used in visited method
String fullyQualifiedMethodName = fullyQualifiedMethodName(normalizedOwner, name, desc);
if (allreadyProcessedLocal.contains(fullyQualifiedMethodName)) {
//skip already processed local methods to prevent stack overflow
return;
}
allreadyProcessedLocal.add(fullyQualifiedMethodName);
ClassReader classReader = CoverageScanner.loadClass(normalizedOwner);
classReader.accept(new MethodDelegatingClassVisitor(normalizedOwner, name, reference,
foundReferences,
allreadyProcessedLocal), ClassReader.SKIP_DEBUG);
}
}
}
super.visitMethodInsn(opcode, owner, name, desc, isInterface);
}
private String fullyQualifiedMethodName(String owner, String name, String desc) {
return format("%s_%s_%s", owner, name, desc);
}
}
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