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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.abicheck.collector;
import com.yahoo.abicheck.signature.JavaClassSignature;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
public class PublicSignatureCollector extends ClassVisitor {
private final Map<String, JavaClassSignature> classSignatures = new LinkedHashMap<>();
private String currentName;
private String currentSuper;
private Set<String> currentInterfaces;
private int currentAccess;
private Set<String> currentMethods;
private Set<String> currentFields;
public PublicSignatureCollector() {
super(Opcodes.ASM9);
}
private static boolean testBit(long access, long mask) {
return (access & mask) != 0;
}
private static String describeMethod(String name, int access, String returnType,
List<String> argumentTypes) {
return String.format("%s %s %s(%s)", describeAccess(access, Util.methodFlags), returnType, name,
String.join(", ", argumentTypes));
}
private static String describeAccess(int access, List<Util.AccessFlag> possibleFlags) {
return String.join(" ", Util.convertAccess(access, possibleFlags));
}
private static String describeField(String name, int access, String type) {
return String.format("%s %s %s", describeAccess(access, Util.fieldFlags), type, name);
}
private static String internalNameToClassName(String superName) {
return Type.getObjectType(superName).getClassName();
}
@Override
public void visit(int version, int access, String name, String signature, String superName,
String[] interfaces) {
currentName = internalNameToClassName(name);
currentSuper = internalNameToClassName(superName);
currentInterfaces = Arrays.stream(interfaces)
.map(PublicSignatureCollector::internalNameToClassName)
.collect(Collectors.toCollection(LinkedHashSet::new));
currentAccess = access;
currentMethods = new LinkedHashSet<>();
currentFields = new LinkedHashSet<>();
}
@Override
public MethodVisitor visitMethod(int access, String name, String descriptor, String signature,
String[] exceptions) {
if (isVisibleMember(access)) {
Type method = Type.getMethodType(descriptor);
List<String> argumentTypes = Arrays.stream(method.getArgumentTypes()).map(Type::getClassName)
.toList();
currentMethods
.add(describeMethod(name, access, method.getReturnType().getClassName(), argumentTypes));
}
return null;
}
@Override
public FieldVisitor visitField(int access, String name, String descriptor, String signature,
Object value) {
if (isVisibleMember(access)) {
currentFields.add(describeField(name, access, Type.getType(descriptor).getClassName()));
}
return null;
}
private boolean isVisibleMember(int access) {
// Public members are visible
if (testBit(access, Opcodes.ACC_PUBLIC)) {
return true;
}
// Protected members are visible if the class is not final (can be accessed from
// extending classes)
if (testBit(access, Opcodes.ACC_PROTECTED) && !testBit(currentAccess, Opcodes.ACC_FINAL)) {
return true;
}
// Otherwise not visible
return false;
}
@Override
public void visitEnd() {
if ((currentAccess & Opcodes.ACC_PUBLIC) != 0) {
classSignatures.put(currentName,
new JavaClassSignature(currentSuper, currentInterfaces,
Util.convertAccess(currentAccess, Util.classFlags), currentMethods, currentFields));
}
}
public Map<String, JavaClassSignature> getClassSignatures() {
return classSignatures;
}
}
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