Examples of org.mvel2.asm.util.TraceClassVisitor

org.ow2.asm.util.TraceClassVisitor
s version 49.0 (49) // access flags 0x21 public class Hello { // compiled from: Hello.java // access flags 0x1 public <init> ()V ALOAD 0 INVOKESPECIAL java/lang/Object <init> ()V RETURN MAXSTACK = 1 MAXLOCALS = 1 // access flags 0x9 public static main ([Ljava/lang/String;)V GETSTATIC java/lang/System out Ljava/io/PrintStream; LDC "hello" INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V RETURN MAXSTACK = 2 MAXLOCALS = 1 } where Hello is defined by:
```
 public class Hello { public static void main(String[] args) { System.out.println("hello"); } } 
```
@author Eric Bruneton @author Eugene Kuleshov

                                 final ProcessBuildContext context,
                                 final String className,
                                 final Map vars,
                                 final Object invokerLookup,
                                 final BaseDescr descrLookup) {
        TemplateRegistry registry = getRuleTemplateRegistry();


        context.getMethods().add(
                TemplateRuntime.execute(registry.getNamedTemplate(ruleTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        registry = getInvokerTemplateRegistry();
        final String invokerClassName = context.getPkg().getName() + "." + context.getProcessDescr().getClassName() + StringUtils.ucFirst(className) + "Invoker";


        context.getInvokers().put(invokerClassName,
                TemplateRuntime.execute(registry.getNamedTemplate(invokerTemplate), null, new MapVariableResolverFactory(vars), registry)
        );


        context.getInvokerLookups().put(invokerClassName,
                invokerLookup);
        context.getDescrLookups().put(invokerClassName,

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        generateMethodTemplate(ruleTemplate, context, vars);
        generateInvokerTemplate(invokerTemplate, context, className, vars, invokerLookup, descrLookup);
    }


    public static void generateMethodTemplate(final String ruleTemplate, final RuleBuildContext context, final Map vars) {
        TemplateRegistry registry = getRuleTemplateRegistry(context.getPackageBuilder().getRootClassLoader());


        context.addMethod((String) TemplateRuntime.execute( registry.getNamedTemplate(ruleTemplate),
                                                            null,
                                                            new MapVariableResolverFactory(vars),
                                                            registry) );
    }

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                                               final RuleBuildContext context,
                                               final String className,
                                               final Map vars,
                                               final Object invokerLookup,
                                               final BaseDescr descrLookup) {
        TemplateRegistry registry = getInvokerTemplateRegistry(context.getPackageBuilder().getRootClassLoader());
        final String invokerClassName = context.getPkg().getName() + "." + context.getRuleDescr().getClassName() + StringUtils.ucFirst( className ) + "Invoker";


        context.getInvokers().put( invokerClassName,
                                   (String) TemplateRuntime.execute( registry.getNamedTemplate( invokerTemplate ),
                                                                     null,
                                                                     new MapVariableResolverFactory( vars ),
                                                                     registry ) );


        context.getInvokerLookups().put( invokerClassName,

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        String[] allVars = new String[varNames.length + locals.length];


        System.arraycopy(varNames, 0, allVars, 0, varNames.length);
        System.arraycopy(locals, 0, allVars, varNames.length, locals.length);        
        
        this.varModel = new SimpleVariableSpaceModel(allVars);
        this.allVarsLength = allVars.length;
        
        return stmt;
    }

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            fos.close();
        }
        
        // "disassembles" the adapted class
        cr = new ClassReader(b);
        cv = new TraceClassVisitor(new PrintWriter(System.out));
        cr.accept(cv, new Attribute[] { new CommentAttribute("") }, 0);
    }

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        final ClassAdapter filter2) throws Exception
    {
        if (!Arrays.equals(cr1.b, cr2.b)) {
            StringWriter sw1 = new StringWriter();
            StringWriter sw2 = new StringWriter();
            ClassVisitor cv1 = new TraceClassVisitor(new PrintWriter(sw1));
            ClassVisitor cv2 = new TraceClassVisitor(new PrintWriter(sw2));
            if (filter1 != null) {
                filter1.cv = cv1;
            }
            if (filter2 != null) {
                filter2.cv = cv2;
            }
            cr1.accept(filter1 == null ? cv1 : filter1, 0);
            cr2.accept(filter2 == null ? cv2 : filter2, 0);
            String s1 = sw1.toString();
            String s2 = sw2.toString();
            try {
                assertEquals("different data", s1, s2);
            } catch (Throwable e) {
                /*
                 * ClassReader may introduce unused labels in the code, due to
                 * the way uninitialized frame types are handled (false
                 * positives may occur, see the doc of ClassReader). These
                 * unused labels may differ before / after a transformation, but
                 * this does not change the method code itself. Thus, if a
                 * difference occurs, we retry a comparison, this time by
                 * removing the unused labels first (we do not do this in the
                 * first place because it is costly).
                 */
                sw1 = new StringWriter();
                sw2 = new StringWriter();
                cv1 = new RemoveUnusedLabelsAdapter(new TraceClassVisitor(new PrintWriter(sw1)));
                cv2 = new RemoveUnusedLabelsAdapter(new TraceClassVisitor(new PrintWriter(sw2)));
                if (filter1 != null) {
                    filter1.cv = cv1;
                }
                if (filter2 != null) {
                    filter2.cv = cv2;

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            ClassReader cr = new ClassReader(is);
            byte[] b = transformClass("", cr.b);
            StringWriter sw1 = new StringWriter();
            StringWriter sw2 = new StringWriter();
            sw2.write(ve.toString() + "\n");
            ClassVisitor cv1 = new TraceClassVisitor(new PrintWriter(sw1));
            ClassVisitor cv2 = new TraceClassVisitor(new PrintWriter(sw2));
            cr.accept(cv1, 0);
            new ClassReader(b).accept(cv2, 0);
            String s1 = sw1.toString();
            String s2 = sw2.toString();
            assertEquals("different data", s1, s2);

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            ClassReader cr = new ClassReader(is);
            byte[] b = transformClass(cr.b);
            StringWriter sw1 = new StringWriter();
            StringWriter sw2 = new StringWriter();
            sw2.write(ve.toString() + "\n");
            ClassVisitor cv1 = new TraceClassVisitor(new PrintWriter(sw1));
            ClassVisitor cv2 = new TraceClassVisitor(new PrintWriter(sw2));
            cr.accept(cv1, 0);
            new ClassReader(b).accept(cv2, 0);
            String s1 = sw1.toString();
            String s2 = sw2.toString();
            assertEquals("different data", s1, s2);

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        final ClassFilter filter2) throws Exception
    {
        if (!Arrays.equals(cr1.b, cr2.b)) {
            StringWriter sw1 = new StringWriter();
            StringWriter sw2 = new StringWriter();
            ClassVisitor cv1 = new TraceClassVisitor(new PrintWriter(sw1));
            ClassVisitor cv2 = new TraceClassVisitor(new PrintWriter(sw2));
            if (filter1 != null) {
                filter1.setNext(cv1);
            }
            if (filter2 != null) {
                filter2.setNext(cv2);

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        FileReader r = new FileReader(fileName);


        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        BFCompiler c = new BFCompiler();
        if (verbose) {
            c.compile(r, className, fileName, new TraceClassVisitor(cw,
                    new PrintWriter(System.out)));
        } else {
            c.compile(r, className, fileName, cw);
        }

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