// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.proxetta.asm;
import jodd.asm5.signature.SignatureVisitor;
import jodd.asm5.Opcodes;
import jodd.util.collection.CharArrayList;
import jodd.util.collection.IntArrayList;
import jodd.mutable.MutableInteger;
import jodd.proxetta.MethodInfo;
import jodd.proxetta.ProxettaException;
import jodd.proxetta.ClassInfo;
import jodd.proxetta.AnnotationInfo;
import jodd.asm.TraceSignatureVisitor;
import java.util.List;
import java.util.ArrayList;
/**
* Resolves method signature and holds all information. Uses {@link jodd.asm.TraceSignatureVisitor} from ASM library.
* <pre>
* MethodSignature = ( visitFormalTypeParameter visitClassBound? visitInterfaceBound* )* ( visitParameterType* visitReturnType visitExceptionType* )
* </pre>
*/
public class MethodSignatureVisitor extends TraceSignatureVisitor implements MethodInfo {
protected int access;
protected String methodName;
protected String signature;
protected int argumentsCount;
protected int argumentsWords;
protected MutableInteger returnOpcodeType;
protected StringBuilder returnTypeName;
protected String classname;
protected String description;
protected String rawSignature;
protected AnnotationInfo[] annotations;
protected boolean visitingArgument;
protected CharArrayList argumentsOpcodeType;
protected IntArrayList argumentsOffset;
protected List<String> argumentsTypeNames;
protected String declaredClassName;
protected ClassInfo targetClassInfo;
protected int hierarchyLevel;
protected boolean isStatic;
// ---------------------------------------------------------------- ctors
/* public MethodSignatureVisitor(String description) {
this();
this.description = description;
}
*/
public MethodSignatureVisitor(String methodName, final int access, String classname, String description, String signature, ClassInfo targetClassInfo) {
this();
this.isInterface = (access & Opcodes.ACC_INTERFACE) != 0;
this.isStatic = (access & Opcodes.ACC_STATIC) != 0;
this.methodName = methodName;
this.access = access;
this.classname = classname;
this.description = description;
this.targetClassInfo = targetClassInfo;
this.rawSignature = signature;
}
private MethodSignatureVisitor() {
super(new StringBuffer());
}
private MethodSignatureVisitor(final StringBuffer declaration) {
super(declaration);
}
private MethodSignatureVisitor(final StringBuffer buf, MutableInteger returnOpcodeType, StringBuilder returnTypeName) {
this(buf);
this.returnOpcodeType = returnOpcodeType;
this.returnTypeName = returnTypeName;
}
// ---------------------------------------------------------------- code
@Override
public SignatureVisitor visitParameterType() {
super.visitParameterType();
visitingArgument = true;
if (argumentsOpcodeType == null) {
argumentsOpcodeType = new CharArrayList();
argumentsOffset = new IntArrayList();
argumentsTypeNames = new ArrayList<String>();
argumentsOpcodeType.add('L');
argumentsOffset.add(0);
argumentsTypeNames.add(null);
}
return this;
}
@Override
public SignatureVisitor visitReturnType() {
super.visitReturnType();
returnOpcodeType = new MutableInteger();
returnTypeName = new StringBuilder();
return new MethodSignatureVisitor(returnType, returnOpcodeType, returnTypeName);
}
@Override
public SignatureVisitor visitExceptionType() {
super.visitExceptionType();
return new MethodSignatureVisitor(exceptions);
}
@Override
public void visitBaseType(final char descriptor) {
String name = null;
char type = descriptor;
if (isArray()) {
type = '[';
name = getArrayDepthString() + descriptor;
}
super.visitBaseType(descriptor);
maybeUseType(type, name);
}
/**
* Visits a signature corresponding to a type variable.
*/
@Override
public void visitTypeVariable(final String name) {
super.visitTypeVariable(name);
maybeUseType('L', name); // toask what is this?
}
/**
* Visits a signature corresponding to an array type.
*/
@Override
public SignatureVisitor visitArrayType() {
super.visitArrayType();
return this;
}
/**
* Starts the visit of a signature corresponding to a class or interface type.
*/
@Override
public void visitClassType(final String name) {
super.visitClassType(name);
maybeUseType('L', 'L' + name + ';');
}
// ---------------------------------------------------------------- method signature
/**
* Returns signature.
*/
public String getSignature() {
if (signature == null) {
signature = createSignature();
}
return signature;
}
private String createSignature() {
StringBuilder methodDeclaration = new StringBuilder(30);
methodDeclaration.append(getReturnType()).append(' ').append(methodName).append(getDeclaration());
String genericExceptions = getExceptions();
if (genericExceptions != null) {
methodDeclaration.append(" throws ").append(genericExceptions);
}
return methodDeclaration.toString();
}
public String getRawSignature() {
return rawSignature;
}
public String getMethodName() {
return methodName;
}
public int getArgumentsCount() {
return argumentsCount;
}
/**
* @param index 1-base index
*/
public char getArgumentOpcodeType(int index) {
return argumentsOpcodeType.get(index);
}
public String getArgumentTypeName(int i) {
return argumentsTypeNames.get(i);
}
public int getArgumentOffset(int index) {
return argumentsOffset.get(index);
}
public int getAllArgumentsSize() {
return argumentsWords;
}
public char getReturnOpcodeType() {
return (char) returnOpcodeType.value;
}
public String getReturnTypeName() {
return returnTypeName.toString();
}
public int getAccessFlags() {
return access;
}
public String getClassname() {
return classname;
}
public String getDescription() {
return description;
}
public AnnotationInfo[] getAnnotations() {
return annotations;
}
public String getDeclaredClassName() {
if (declaredClassName == null) {
return classname;
}
return declaredClassName;
}
public void setDeclaredClassName(String declaredClassName) {
this.declaredClassName = declaredClassName;
}
public boolean isTopLevelMethod() {
return declaredClassName == null;
}
public ClassInfo getClassInfo() {
return targetClassInfo;
}
public int getHierarchyLevel() {
return hierarchyLevel;
}
// ---------------------------------------------------------------- utilities
/**
* Returns <code>true</code> if we are currently visiting an array.
*/
private boolean isArray() {
return arrayStack != 0;
}
/**
* Add '[' for current array depth.
*/
private String getArrayDepthString() {
int aStack = arrayStack; // copy value
StringBuilder ads = new StringBuilder();
while (aStack % 2 != 0) {
aStack /= 2;
ads.append('[');
}
return ads.toString();
}
/**
* Saves argument type if parameter is currently visiting, otherwise
* saves return type. When saving arguments data, stores also current argument offset.
*/
private void maybeUseType(char type, String typeName) {
if (visitingArgument == true) {
if (isArray() == true) {
type = '[';
typeName = getArrayDepthString() + typeName;
}
if (type == 'V') {
throw new ProxettaException("Method argument can't be void");
}
argumentsCount++;
argumentsOpcodeType.add(type);
argumentsOffset.add(argumentsWords + 1);
argumentsTypeNames.add(typeName);
if ((type == 'D') || (type == 'J')) {
argumentsWords += 2;
} else {
argumentsWords++;
}
visitingArgument = false;
} else if (returnOpcodeType != null) {
if (isArray() == true) {
type = '[';
typeName = getArrayDepthString() + typeName;
}
returnOpcodeType.value = type;
returnTypeName.setLength(0);
if (typeName != null) {
returnTypeName.append(typeName);
}
}
}
// ---------------------------------------------------------------- toString
/*
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
MethodSignatureVisitor that = (MethodSignatureVisitor) o;
return getSignature().equals(that.getSignature());
}
@Override
public int hashCode() {
return getSignature().hashCode();
}
*/
@Override
public String toString() {
return getDeclaredClassName() + '#' + getMethodName() + getDescription();
}
}