/*
* Copyright 2000-2004 The Apache Software Foundation
*
* 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.
*
*/
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.MethodGen;
/**
* Read class file(s) and examine all of its methods, determining the
* maximum stack depth used by analyzing control flow.
*
* @version $Id: maxstack.java 410087 2006-05-29 12:12:19Z tcurdt $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public final class maxstack {
public static void main(String[] argv) {
try {
for(int i = 0; i < argv.length; i++) {
String class_name = argv[i];
JavaClass java_class = Repository.lookupClass(class_name);
if(java_class == null) {
java_class = new ClassParser(class_name).parse();
}
ConstantPoolGen cp = new ConstantPoolGen(java_class.getConstantPool());
Method[] methods = java_class.getMethods();
for(int j = 0; j < methods.length; j++) {
Method m = methods[j];
if(!(m.isAbstract() || m.isNative())) {
MethodGen mg = new MethodGen(m, argv[i], cp);
int compiled_stack = mg.getMaxStack();
int compiled_locals = mg.getMaxLocals();
mg.setMaxStack(); // Recompute value
mg.setMaxLocals();
int computed_stack = mg.getMaxStack();
int computed_locals = mg.getMaxLocals();
mg.getInstructionList().dispose(); // Reuse instruction handles
System.out.println(m);
if(computed_stack == compiled_stack) {
System.out.println("Stack ok(" + computed_stack + ")");
} else {
System.out.println("\nCompiled stack size " + compiled_stack +
" computed size " + computed_stack);
}
if(computed_locals == compiled_locals) {
System.out.println("Locals ok(" + computed_locals + ")");
} else {
System.out.println("\nCompiled locals " + compiled_locals +
" computed size " + computed_locals);
}
}
}
}
} catch(Exception e) {
e.printStackTrace();
}
}
}