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/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
/*
* ASMClosureCompilerImpl.java
*
* Created on August 13, 2004, 3:34 PM
*/
package com.sun.enterprise.tools.verifier.apiscan.classfile;
import java.io.IOException;
import java.util.*;
import java.util.logging.Level;
/**
* An implementation of {@link ClosureCompilerImplBase} based on
* ASM.
*
* It is not a public class because I expect users to use this class via
* the bridge setup from {@link ClosureCompilerImpl}.
* It extends the common implementation from ClosureCompilerImplBase.
* @author [email protected]
*/
class ASMClosureCompilerImpl extends ClosureCompilerImplBase {
private Collection methodReferences = new HashSet();
private HashSet visitedMethods = new HashSet();
private Stack callStack = new Stack();
// holds result of current buildClosure() method
private boolean result;
private HashSet closure = new HashSet();
//map of refencing path to list of not found classes.
private Map> failed = new HashMap>();
private static final String myClassName = "ASMClosureCompilerImpl"; // NOI18N
/**
* @param loader the ClassFileLoader that is used to load the referenced
* classes.
*/
public ASMClosureCompilerImpl(ClassFileLoader loader) {
super(loader);
}
private void resetResult() {
logger.entering("ASMClosureCompilerImpl", "resetResult", // NOI18N
new Object[]{});
result = true;
}
private void setResult(boolean newresult){
result = result && newresult;
}
private boolean getResult() {
return result;
}
/**
* {@inheritDoc}
*/
public boolean buildClosure(String className) {
logger.entering(myClassName, "buildClosure", className); // NOI18N
resetResult(); // at the entry of this public method, we reset result.
if (needToBuildClosure(className)) {
visitedClasses.add(className); // yes, we add before visting
ClassFile cf = load(className);
if(cf==null){
return false;
}
// top level methods whose closure needs to be calculated.
// TODO: We must get precise list of methods.
Collection methods = cf.getMethods();
for(Method next:methods){
methodReferences.add(next.getSelfReference());
buildClosure(next);
}
}
return getResult();
}
private void buildClosure(Method m) {
MethodRef methodReference = m.getSelfReference();
logger.entering("ASMClosureCompilerImpl", "buildClosure", // NOI18N
new Object[]{methodReference});
callStack.push(methodReference);
if (needToBuildClosure(methodReference)) {
visitedMethods.add(methodReference);
Collection methodRefs = m.getReferencedMethods();
methodReferences.addAll(methodRefs);
for(MethodRef nextMethodRef : methodRefs) {
if (!needToBuildClosure(nextMethodRef)) continue;
ClassFile cf = load(Util.convertToExternalClassName
(nextMethodRef.getOwningClassName()));
if (cf == null) {
continue; // no need to call handleFailure() as it is done by this.load()
}
Method nextMethod = cf.getMethod(nextMethodRef);
if(nextMethod==null){
handleFailure(nextMethodRef);
continue;
}
buildClosure(nextMethod);//recurssive call
} // for
// now go thru' all the classes that will be loaded when this
// method is called.
for(String className : m.getReferencedClasses()){
String externalClassName = Util.convertToExternalClassName(className);
if(!needToBuildClosure(externalClassName)) continue;
load(externalClassName);
}
}
callStack.pop();
}
/**
* load class with given name. It also recurssively loads all classes in the
* super class chain and interfaces implemented by this class and
* its super classes, until it reaches a class which is found in the
* excluded list. It also builds closure of each of the class's clinit method.
*
* @param className name of class in external format.
* @return ClassFile representing this class name,
* It returns null if class has been already loaded or need not be loaded
* because it is an excluded class or could not be loaded. If class could
* could not be loaded, it calls appropriate handleFailure().
* @see #needToLoad(String)
*/
protected ClassFile load(String className) {
logger.entering("ASMClosureCompilerImpl", "load", // NOI18N
new Object[]{className});
ClassFile cf = null;
try{
cf = loader.load(className);
}catch(IOException e){
handleFailure(className);
}
if((cf!=null) && needToLoad(className)) {
closure.add(className); // yes we add before actually loading.
MethodRef clinitMethodRef =
new MethodRef(Util.convertToInternalClassName(className),
MethodRef.CLINIT_NAME,
MethodRef.CLINIT_DESC);
Method clinitMethod = cf.getMethod(clinitMethodRef);
try{
// See we push clinitMethodRef here so that we can display
// useful error to user even during class loading.
callStack.push(clinitMethodRef);
String superClassName = cf.getNameOfSuperClass();
if(superClassName!=null && needToBuildClosure(superClassName)) { // super class of java.lang.Object is null
load(superClassName); //recurssive call
}
for(String interfaceClassName : cf.getNamesOfInterfaces()){
if(needToBuildClosure(interfaceClassName)) {
load(interfaceClassName); // recurssive call
}
}
}finally{
// pop callStack before buildClosure is called for clinit
callStack.pop();
}
if(clinitMethod!=null) {
methodReferences.add(clinitMethodRef);
buildClosure(clinitMethod); // recurssive call
}
}
logger.exiting("ASMClosureCompilerImpl", "load", cf==null?"null":cf.getName()); // NOI18N
return cf;
}
private void handleFailure(MethodRef mr){
logger.logp(Level.WARNING, "ASMClosureCompilerImpl", "handleFailure",
getClass().getName() + ".exception1", new Object[]{mr.toString()});
// setResult(false);
// TODO: We should look for base class methods
}
/**
* @param referencedClass is the name of the class in external format.
*/
private void handleFailure(String referencedClass) {
logger.entering("ASMClosureCompilerImpl", "handleFailure", // NOI18N
new Object[]{referencedClass});
setResult(false);
String referencingPath = "";
try {
StringBuilder referencingPathBuffer = new StringBuilder();
for (MethodRef m : callStack) {
if (referencingPathBuffer.length() != 0)
referencingPathBuffer.append("->"); // NOI18N
referencingPathBuffer.append(m);
}
referencingPath = referencingPathBuffer.toString();
} catch (EmptyStackException e) {
}
List failedList = failed.get(referencingPath);
if (failedList == null) {
failedList = new ArrayList();
failed.put(referencingPath, failedList);
}
failedList.add(referencedClass);
}
/**
* {@inheritDoc}
*/
public Collection getClosure() {
return Collections.unmodifiableCollection(methodReferences);
}
/**
* {@inheritDoc}
*/
public Map getFailed() {
return Collections.unmodifiableMap(failed);
}
/**
* Reset the closure for next closure computation.
* Clear the internal cache. It includes the result it has collected since
* last reset(). But it does not clear the excludedd list. If you want to
* reset the excluded list, create a new ClosureCompiler.
*/
public void reset() {
methodReferences.clear();
visitedClasses.clear();
failed.clear();
closure.clear();
}
/**
* @param className name of class in external format.
* @return
*/
protected boolean needToLoad(String className) {
return !closure.contains(className);
}
protected boolean needToBuildClosure(MethodRef methodRef) {
boolean result = true;
final String owningClassName = methodRef.getOwningClassName();
if (visitedMethods.contains(methodRef))
result = false;
else if (excludedClasses.contains(owningClassName)) {
result = false;
} else if (excludedPackages.contains(getPackageName(owningClassName))) {
result = false;
} else {
for (Iterator i = excludedPatterns.iterator(); i.hasNext();) {
String pattern = (String) i.next();
if (owningClassName.startsWith(pattern)) {
result = false;
break;
}
}
}
logger.logp(Level.FINEST, myClassName, "needToBuildClosure", // NOI18N
methodRef + " " + result); // NOI18N
return result;
}
// used for pretty printing
public String toString() {
StringBuilder sb=new StringBuilder();
if(logger.isLoggable(Level.FINER)){
sb.append("\n"); // NOI18N
sb.append("\n\t"); // NOI18N
for(Iterator i=excludedClasses.iterator(); i.hasNext();) {
sb.append("\n\t\t"); // NOI18N
sb.append((String)i.next());
}
sb.append("\n\t"); // NOI18N
sb.append("\n\t"); // NOI18N
for(Iterator i=excludedPackages.iterator(); i.hasNext();){
sb.append("\n\t\t"); // NOI18N
sb.append((String)i.next());
}
sb.append("\n\t"); // NOI18N
sb.append("\n\t"); // NOI18N
for(Iterator i=excludedPatterns.iterator(); i.hasNext();){
sb.append("\n\t\t"); // NOI18N
sb.append((String)i.next());
}
sb.append("\n\t"); // NOI18N
sb.append("\n\t"); // NOI18N
for(MethodRef m : methodReferences){
sb.append("\n\t\t"); // NOI18N
sb.append(m);
}
sb.append("\n\t"); // NOI18N
sb.append("\n\t"); // NOI18N
for(String c : closure){
sb.append("\n\t\t"); // NOI18N
sb.append(c);
}
sb.append("\n\t"); // NOI18N
}
sb.append("\n\t"); // NOI18N
for(Iterator i=failed.entrySet().iterator(); i.hasNext();) {
Map.Entry referencingPathToFailedList=(Map.Entry)i.next();
sb.append("\n\t\t"); // NOI18N
sb.append(""); // NOI18N
sb.append("\n\t\t\t"); // NOI18N
sb.append(referencingPathToFailedList.getKey());
sb.append("\n\t\t"); // NOI18N
sb.append(""); // NOI18N
sb.append("\n\t\t"); // NOI18N
sb.append(""); // NOI18N
for(Iterator iii=((List)referencingPathToFailedList.getValue()).iterator(); iii.hasNext();){
sb.append("\n\t\t\t"); // NOI18N
sb.append((String)iii.next());
}
sb.append("\n\t\t"); // NOI18N
sb.append(""); // NOI18N
}
sb.append("\n\t"); // NOI18N
if(logger.isLoggable(Level.FINER)){
sb.append("\n"); // NOI18N
}
return sb.toString();
}
}
