Java Code Examples for org.apache.bcel.generic.ClassGen#getMethods()

The following examples show how to use org.apache.bcel.generic.ClassGen#getMethods() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: BCELPerfTest.java    From annotation-tools with MIT License 5 votes vote down vote up 
byte[] nullAdaptClass(final InputStream is, final String name)
        throws Exception
{
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
        MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
        boolean lv = ms[j].getLocalVariableTable() == null;
        boolean ln = ms[j].getLineNumberTable() == null;
        if (lv) {
            mg.removeLocalVariables();
        }
        if (ln) {
            mg.removeLineNumbers();
        }
        mg.stripAttributes(skipDebug);
        InstructionList il = mg.getInstructionList();
        if (il != null) {
            InstructionHandle ih = il.getStart();
            while (ih != null) {
                ih = ih.getNext();
            }
            if (compute) {
                mg.setMaxStack();
                mg.setMaxLocals();
            }
        }
        cg.replaceMethod(ms[j], mg.getMethod());
    }
    return cg.getJavaClass().getBytes();
}
Example 2
Source File: BCELPerfTest.java    From annotation-tools with MIT License 5 votes vote down vote up 
byte[] nullAdaptClass(final InputStream is, final String name)
        throws Exception
{
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
        MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
        boolean lv = ms[j].getLocalVariableTable() == null;
        boolean ln = ms[j].getLineNumberTable() == null;
        if (lv) {
            mg.removeLocalVariables();
        }
        if (ln) {
            mg.removeLineNumbers();
        }
        mg.stripAttributes(skipDebug);
        InstructionList il = mg.getInstructionList();
        if (il != null) {
            InstructionHandle ih = il.getStart();
            while (ih != null) {
                ih = ih.getNext();
            }
            if (compute) {
                mg.setMaxStack();
                mg.setMaxLocals();
            }
        }
        cg.replaceMethod(ms[j], mg.getMethod());
    }
    return cg.getJavaClass().getBytes();
}
Example 3
Source File: BCELBenchmark.java    From commons-bcel with Apache License 2.0 5 votes vote down vote up 
@Benchmark
public void generator(Blackhole bh) throws IOException {
    JarFile jar = getJarFile();

    for (JarEntry entry : getClasses(jar)) {
        byte[] bytes = IOUtils.toByteArray(jar.getInputStream(entry));

        JavaClass clazz = new ClassParser(new ByteArrayInputStream(bytes), entry.getName()).parse();

        ClassGen cg = new ClassGen(clazz);

        for (Method m : cg.getMethods()) {
            MethodGen mg = new MethodGen(m, cg.getClassName(), cg.getConstantPool());
            InstructionList il = mg.getInstructionList();

            if (il != null) {
                mg.getInstructionList().setPositions();
                mg.setMaxLocals();
                mg.setMaxStack();
            }
            cg.replaceMethod(m, mg.getMethod());
        }

        bh.consume(cg.getJavaClass().getBytes());
    }

    jar.close();
}
Example 4
Source File: BCELPerfTest.java    From annotation-tools with MIT License 4 votes vote down vote up 
byte[] counterAdaptClass(final InputStream is, final String name)
        throws Exception
{
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    if (!cg.isInterface()) {
        FieldGen fg = new FieldGen(ACC_PUBLIC,
                Type.getType("I"),
                "_counter",
                cp);
        cg.addField(fg.getField());
    }
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
        MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
        if (!mg.getName().equals("<init>") && !mg.isStatic()
                && !mg.isAbstract() && !mg.isNative())
        {
            if (mg.getInstructionList() != null) {
                InstructionList il = new InstructionList();
                il.append(new ALOAD(0));
                il.append(new ALOAD(0));
                il.append(new GETFIELD(cp.addFieldref(name, "_counter", "I")));
                il.append(new ICONST(1));
                il.append(new IADD());
                il.append(new PUTFIELD(cp.addFieldref(name, "_counter", "I")));
                mg.getInstructionList().insert(il);
                mg.setMaxStack(Math.max(mg.getMaxStack(), 2));
                boolean lv = ms[j].getLocalVariableTable() == null;
                boolean ln = ms[j].getLineNumberTable() == null;
                if (lv) {
                    mg.removeLocalVariables();
                }
                if (ln) {
                    mg.removeLineNumbers();
                }
                cg.replaceMethod(ms[j], mg.getMethod());
            }
        }
    }
    return cg.getJavaClass().getBytes();
}
Example 5
Source File: BCELPerfTest.java    From annotation-tools with MIT License 4 votes vote down vote up 
byte[] counterAdaptClass(final InputStream is, final String name)
        throws Exception
{
    JavaClass jc = new ClassParser(is, name + ".class").parse();
    ClassGen cg = new ClassGen(jc);
    ConstantPoolGen cp = cg.getConstantPool();
    if (!cg.isInterface()) {
        FieldGen fg = new FieldGen(ACC_PUBLIC,
                Type.getType("I"),
                "_counter",
                cp);
        cg.addField(fg.getField());
    }
    Method[] ms = cg.getMethods();
    for (int j = 0; j < ms.length; ++j) {
        MethodGen mg = new MethodGen(ms[j], cg.getClassName(), cp);
        if (!mg.getName().equals("<init>") && !mg.isStatic()
                && !mg.isAbstract() && !mg.isNative())
        {
            if (mg.getInstructionList() != null) {
                InstructionList il = new InstructionList();
                il.append(new ALOAD(0));
                il.append(new ALOAD(0));
                il.append(new GETFIELD(cp.addFieldref(name, "_counter", "I")));
                il.append(new ICONST(1));
                il.append(new IADD());
                il.append(new PUTFIELD(cp.addFieldref(name, "_counter", "I")));
                mg.getInstructionList().insert(il);
                mg.setMaxStack(Math.max(mg.getMaxStack(), 2));
                boolean lv = ms[j].getLocalVariableTable() == null;
                boolean ln = ms[j].getLineNumberTable() == null;
                if (lv) {
                    mg.removeLocalVariables();
                }
                if (ln) {
                    mg.removeLineNumbers();
                }
                cg.replaceMethod(ms[j], mg.getMethod());
            }
        }
    }
    return cg.getJavaClass().getBytes();
}
Example 6
Source File: PerformanceTest.java    From commons-bcel with Apache License 2.0 4 votes vote down vote up 
private static void test(final File lib) throws IOException {
    final NanoTimer total = new NanoTimer();
    final NanoTimer parseTime = new NanoTimer();
    final NanoTimer cgenTime = new NanoTimer();
    final NanoTimer mgenTime = new NanoTimer();
    final NanoTimer mserTime = new NanoTimer();
    final NanoTimer serTime = new NanoTimer();

    System.out.println("parsing " + lib);

    total.start();
    try (JarFile jar = new JarFile(lib)) {
        final Enumeration<?> en = jar.entries();

        while (en.hasMoreElements()) {
            final JarEntry e = (JarEntry) en.nextElement();
            if (e.getName().endsWith(".class")) {
                byte[] bytes;
                try (InputStream in = jar.getInputStream(e)) {
                    bytes = read(in);
                }

                parseTime.start();
                final JavaClass clazz = new ClassParser(new ByteArrayInputStream(bytes), e.getName()).parse();
                parseTime.stop();

                cgenTime.start();
                final ClassGen cg = new ClassGen(clazz);
                cgenTime.stop();

                final Method[] methods = cg.getMethods();
                for (final Method m : methods) {
                    mgenTime.start();
                    final MethodGen mg = new MethodGen(m, cg.getClassName(), cg.getConstantPool());
                    final InstructionList il = mg.getInstructionList();
                    mgenTime.stop();

                    mserTime.start();
                    if (il != null) {
                        mg.getInstructionList().setPositions();
                        mg.setMaxLocals();
                        mg.setMaxStack();
                    }
                    cg.replaceMethod(m, mg.getMethod());
                    mserTime.stop();
                }

                serTime.start();
                cg.getJavaClass().getBytes();
                serTime.stop();
            }
        }
    }
    total.stop();
    if (REPORT) {
        System.out.println("ClassParser.parse: " + parseTime);
        System.out.println("ClassGen.init: " + cgenTime);
        System.out.println("MethodGen.init: " + mgenTime);
        System.out.println("MethodGen.getMethod: " + mserTime);
        System.out.println("ClassGen.getJavaClass.getBytes: " + serTime);
        System.out.println("Total: " + total);
        System.out.println();
    }
}