/*******************************************************************************
* Copyright (c) 2002,2006 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package com.ibm.wala.shrike.bench;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.Writer;
import java.util.Random;
import com.ibm.wala.shrikeBT.ConditionalBranchInstruction;
import com.ibm.wala.shrikeBT.ConstantInstruction;
import com.ibm.wala.shrikeBT.Constants;
import com.ibm.wala.shrikeBT.Disassembler;
import com.ibm.wala.shrikeBT.DupInstruction;
import com.ibm.wala.shrikeBT.IArrayStoreInstruction;
import com.ibm.wala.shrikeBT.IGetInstruction;
import com.ibm.wala.shrikeBT.IPutInstruction;
import com.ibm.wala.shrikeBT.LoadInstruction;
import com.ibm.wala.shrikeBT.MethodData;
import com.ibm.wala.shrikeBT.MethodEditor;
import com.ibm.wala.shrikeBT.MethodEditor.Output;
import com.ibm.wala.shrikeBT.StoreInstruction;
import com.ibm.wala.shrikeBT.SwapInstruction;
import com.ibm.wala.shrikeBT.Util;
import com.ibm.wala.shrikeBT.analysis.Verifier;
import com.ibm.wala.shrikeBT.info.LocalAllocator;
import com.ibm.wala.shrikeBT.shrikeCT.ClassInstrumenter;
import com.ibm.wala.shrikeBT.shrikeCT.OfflineInstrumenter;
import com.ibm.wala.shrikeCT.ClassWriter;
/**
* This is a demo class.
*
* Class files are taken as input arguments (or if there are none, from standard input). The methods in those files are
* instrumented: we insert a System.err.println() at ever method call, and a System.err.println() at every method entry.
*
* In Unix, I run it like this: java -cp ~/dev/shrike/shrike com.ibm.wala.shrikeBT.shrikeCT.tools.Bench test.jar -o output.jar
*
* The instrumented classes are placed in the directory "output" under the current directory. Disassembled code is written to the
* file "report" under the current directory.
*/
public class Mangler {
private static OfflineInstrumenter instrumenter;
private static final boolean verify = true;
private static final boolean disasm = true;
public static void main(String[] args) throws Exception {
for (int i = 0; i < 1; i++) {
instrumenter = new OfflineInstrumenter(true);
Writer w = new BufferedWriter(new FileWriter("report", false));
args = instrumenter.parseStandardArgs(args);
int seed;
try {
seed = Integer.parseInt(args[0]);
} catch (NumberFormatException ex) {
System.err.println("Invalid number: " + args[0]);
w.close();
return;
}
Random r = new Random(seed);
instrumenter.setPassUnmodifiedClasses(true);
instrumenter.beginTraversal();
instrumenter.setOutputJar(new File("output.jar"));
ClassInstrumenter ci;
while ((ci = instrumenter.nextClass()) != null) {
doClass(ci, w, r);
}
instrumenter.close();
}
}
private static void doClass(final ClassInstrumenter ci, Writer w, final Random r) throws Exception {
final String className = ci.getReader().getName();
w.write("Class: " + className + "\n");
w.flush();
for (int m = 0; m < ci.getReader().getMethodCount(); m++) {
MethodData d = ci.visitMethod(m);
// d could be null, e.g., if the method is abstract or native
if (d != null) {
w.write("Instrumenting " + ci.getReader().getMethodName(m) + " " + ci.getReader().getMethodType(m) + ":\n");
w.flush();
if (disasm) {
w.write("Initial ShrikeBT code:\n");
(new Disassembler(d)).disassembleTo(w);
w.flush();
}
if (verify) {
Verifier v = new Verifier(d);
v.verify();
}
final int passes = r.nextInt(4) + 1;
for (int i = 0; i < passes; i++) {
final boolean doGet = true; // r.nextBoolean();
final boolean doPut = true; // r.nextBoolean();
final boolean doArrayStore = true; // r.nextBoolean();
final int tmpInt = LocalAllocator.allocate(d, "I");
final int tmpAny = LocalAllocator.allocate(d);
final MethodEditor me = new MethodEditor(d);
me.beginPass();
me.visitInstructions(new MethodEditor.Visitor() {
@Override
public void visitGet(IGetInstruction instruction) {
if (doGet && !instruction.isStatic()) {
insertBefore(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
w.emit(DupInstruction.make(0));
}
});
insertAfter(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
w.emit(SwapInstruction.make());
w.emit(Util.makePut(Slots.class, "o"));
}
});
}
}
@Override
public void visitPut(IPutInstruction instruction) {
if (doPut && !instruction.isStatic()) {
insertBefore(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
w.emit(SwapInstruction.make());
w.emit(DupInstruction.make(1));
w.emit(SwapInstruction.make());
}
});
insertAfter(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
w.emit(Util.makePut(Slots.class, "o"));
}
});
}
}
@Override
public void visitArrayStore(final IArrayStoreInstruction instruction) {
if (doArrayStore) {
final int label = me.allocateLabel();
insertBefore(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
String t = Util.getStackType(instruction.getType());
w.emit(StoreInstruction.make(t, tmpAny));
w.emit(StoreInstruction.make(Constants.TYPE_int, tmpInt));
w.emit(DupInstruction.make(0));
w.emit(LoadInstruction.make(Constants.TYPE_int, tmpInt));
w.emit(LoadInstruction.make(t, tmpAny));
if (t.equals(Constants.TYPE_int)) {
w.emit(DupInstruction.make(0));
w.emit(ConstantInstruction.make(0));
w.emit(ConditionalBranchInstruction.make(t, ConditionalBranchInstruction.Operator.EQ, label));
w.emit(DupInstruction.make(0));
w.emit(Util.makePut(Slots.class, "i"));
w.emitLabel(label);
}
}
});
insertAfter(new MethodEditor.Patch() {
@Override
public void emitTo(Output w) {
w.emit(Util.makePut(Slots.class, "o"));
w.emit(LoadInstruction.make(Constants.TYPE_int, tmpInt));
w.emit(Util.makePut(Slots.class, "i"));
}
});
}
}
});
// this updates the data d
me.applyPatches();
}
if (disasm) {
w.write("Final ShrikeBT code:\n");
(new Disassembler(d)).disassembleTo(w);
w.flush();
}
}
}
if (ci.isChanged()) {
ClassWriter cw = ci.emitClass();
instrumenter.outputModifiedClass(ci, cw);
}
}
}