Package org.ow2.asm

Examples of org.ow2.asm.ClassWriter

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    }

    @Override
    public void test() throws Exception {
        ClassReader cr = new ClassReader(is);
        ClassWriter cw = new ClassWriter(0);
        cr.accept(new CheckClassAdapter(cw), 0);
        assertEquals(cr, new ClassReader(cw.toByteArray()));
    }
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        byte[] b;

        // adapts the class on the fly
        try {
            ClassReader cr = new ClassReader(is);
            ClassWriter cw = new ClassWriter(0);
            ClassVisitor cv = new TraceFieldClassAdapter(cw);
            cr.accept(cv, 0);
            b = cw.toByteArray();
        } catch (Exception e) {
            throw new ClassNotFoundException(name, e);
        }

        // optional: stores the adapted class on disk
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     * Returns the byte code of an Expression class corresponding to this
     * expression.
     */
    byte[] compile(final String name) {
        // class header
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        cw.visit(V1_1, ACC_PUBLIC, name, null, "java/lang/Object", new String[] { Expression.class.getName() });

        // default public constructor
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();

        // eval method
        mv = cw.visitMethod(ACC_PUBLIC, "eval", "(II)I", null, null);
        compile(mv);
        mv.visitInsn(IRETURN);
        // max stack and max locals automatically computed
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        return cw.toByteArray();
    }
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    public void test() throws Exception {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        ClassReader cr = new ClassReader(is);
        ClassWriter cw = new ClassWriter(0);
        ClassVisitor cv = new JasminifierClassAdapter(pw, cw);
        cr.accept(cv,
                new Attribute[] { new Comment(), new CodeComment() },
                ClassReader.EXPAND_FRAMES);
        pw.close();
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        } catch (Exception e) {
            e.printStackTrace(System.out);
        }

        final String n = Annotations.class.getName();
        final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        ClassReader cr = new ClassReader(n);
        cr.accept(new ClassAdapter(cw) {

            @Override
            public MethodVisitor visitMethod(
                final int access,
                final String name,
                final String desc,
                final String signature,
                final String[] exceptions)
            {
                final Type[] args = Type.getArgumentTypes(desc);
                MethodVisitor v = cv.visitMethod(access,
                        name,
                        desc,
                        signature,
                        exceptions);
                return new MethodAdapter(v) {

                    private final List<Integer> params = new ArrayList<Integer>();

                    @Override
                    public AnnotationVisitor visitParameterAnnotation(
                        final int parameter,
                        final String desc,
                        final boolean visible)
                    {
                        AnnotationVisitor av;
                        av = mv.visitParameterAnnotation(parameter,
                                desc,
                                visible);
                        if (desc.equals("LNotNull;")) {
                            params.add(new Integer(parameter));
                        }
                        return av;
                    }

                    @Override
                    public void visitCode() {
                        int var = (access & Opcodes.ACC_STATIC) == 0 ? 1 : 0;
                        for (int p = 0; p < params.size(); ++p) {
                            int param = params.get(p).intValue();
                            for (int i = 0; i < param; ++i) {
                                var += args[i].getSize();
                            }
                            String c = "java/lang/IllegalArgumentException";
                            String d = "(Ljava/lang/String;)V";
                            Label end = new Label();
                            mv.visitVarInsn(Opcodes.ALOAD, var);
                            mv.visitJumpInsn(Opcodes.IFNONNULL, end);
                            mv.visitTypeInsn(Opcodes.NEW, c);
                            mv.visitInsn(Opcodes.DUP);
                            mv.visitLdcInsn("Argument " + param
                                    + " must not be null");
                            mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
                                    c,
                                    "<init>",
                                    d);
                            mv.visitInsn(Opcodes.ATHROW);
                            mv.visitLabel(end);
                        }
                    }
                };
            }
        }, 0);

        Class<?> c = new ClassLoader() {
            @Override
            public Class<?> loadClass(final String name)
                    throws ClassNotFoundException
            {
                if (name.equals(n)) {
                    byte[] b = cw.toByteArray();
                    return defineClass(name, b, 0, b.length);
                }
                return super.loadClass(name);
            }
        }.loadClass(n);
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        // }
        // }

        // creates a ClassWriter for the Example public class,
        // which inherits from Object
        ClassWriter cw = new ClassWriter(0);
        cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);

        // creates a MethodWriter for the (implicit) constructor
        MethodVisitor mw = cw.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        // pushes the 'this' variable
        mw.visitVarInsn(ALOAD, 0);
        // invokes the super class constructor
        mw.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mw.visitInsn(RETURN);
        // this code uses a maximum of one stack element and one local variable
        mw.visitMaxs(1, 1);
        mw.visitEnd();

        // creates a MethodWriter for the 'main' method
        mw = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
                "main",
                "([Ljava/lang/String;)V",
                null,
                null);
        // pushes the 'out' field (of type PrintStream) of the System class
        mw.visitFieldInsn(GETSTATIC,
                "java/lang/System",
                "out",
                "Ljava/io/PrintStream;");
        // pushes the "Hello World!" String constant
        mw.visitLdcInsn("Hello world!");
        // invokes the 'println' method (defined in the PrintStream class)
        mw.visitMethodInsn(INVOKEVIRTUAL,
                "java/io/PrintStream",
                "println",
                "(Ljava/lang/String;)V");
        mw.visitInsn(RETURN);
        // this code uses a maximum of two stack elements and two local
        // variables
        mw.visitMaxs(2, 2);
        mw.visitEnd();

        // gets the bytecode of the Example class, and loads it dynamically
        byte[] code = cw.toByteArray();

        FileOutputStream fos = new FileOutputStream("Example.class");
        fos.write(code);
        fos.close();

        Helloworld loader = new Helloworld();
        Class<?> exampleClass = loader.defineClass("Example", code, 0, code.length);

        // uses the dynamically generated class to print 'Helloworld'
        exampleClass.getMethods()[0].invoke(null, new Object[] { null });

        // ------------------------------------------------------------------------
        // Same example with a GeneratorAdapter (more convenient but slower)
        // ------------------------------------------------------------------------

        cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);

        // creates a GeneratorAdapter for the (implicit) constructor
        Method m = Method.getMethod("void <init> ()");
        GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC,
                m,
                null,
                null,
                cw);
        mg.loadThis();
        mg.invokeConstructor(Type.getType(Object.class), m);
        mg.returnValue();
        mg.endMethod();

        // creates a GeneratorAdapter for the 'main' method
        m = Method.getMethod("void main (String[])");
        mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw);
        mg.getStatic(Type.getType(System.class),
                "out",
                Type.getType(PrintStream.class));
        mg.push("Hello world!");
        mg.invokeVirtual(Type.getType(PrintStream.class),
                Method.getMethod("void println (String)"));
        mg.returnValue();
        mg.endMethod();

        cw.visitEnd();

        code = cw.toByteArray();
        loader = new Helloworld();
        exampleClass = loader.defineClass("Example", code, 0, code.length);

        // uses the dynamically generated class to print 'Helloworld'
        exampleClass.getMethods()[0].invoke(null, new Object[] { null });
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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);
        }

        r.close();

        FileOutputStream os = new FileOutputStream(className + ".class");
        os.write(cw.toByteArray());
        os.flush();
        os.close();
    }
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        {
            this.os = os;
        }

        public final ContentHandler createContentHandler() {
            final ClassWriter cw = new ClassWriter(
                    ClassWriter.COMPUTE_MAXS);
            return new ASMContentHandler(cw) {
                @Override
                public void endDocument() throws SAXException {
                    try {
                        os.write(cw.toByteArray());
                    } catch(IOException e) {
                        throw new SAXException(e);
                    }
                }
            };
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                optimize(files[i], d, remapper);
            }
        } else if (f.getName().endsWith(".class")) {
            ConstantPool cp = new ConstantPool();
            ClassReader cr = new ClassReader(new FileInputStream(f));
            ClassWriter cw = new ClassWriter(0);
            ClassConstantsCollector ccc = new ClassConstantsCollector(cw, cp);
            ClassOptimizer co = new ClassOptimizer(ccc, remapper);
            cr.accept(co, ClassReader.SKIP_DEBUG);

            Set<Constant> constants = new TreeSet<Constant>(new ConstantComparator());
            constants.addAll(cp.values());

            cr = new ClassReader(cw.toByteArray());
            cw = new ClassWriter(0);
            Iterator<Constant> i = constants.iterator();
            while (i.hasNext()) {
                Constant c = i.next();
                c.write(cw);
            }
            cr.accept(cw, ClassReader.SKIP_DEBUG);

            if (MAPPING.get(cr.getClassName() + "/remove") != null) {
                return;
            }
            String n = remapper.mapType(cr.getClassName());
            File g = new File(d, n + ".class");
            if (!g.exists() || g.lastModified() < f.lastModified()) {
                if (!g.getParentFile().exists() && !g.getParentFile().mkdirs()) {
                    throw new IOException("Cannot create directory " + g.getParentFile());
                }
                OutputStream os = new FileOutputStream(g);
                try {
                    os.write(cw.toByteArray());
                } finally {
                    os.close();
                }
            }
        }
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        new BFCompilerTest().testCompileTest1();
  }

    public BFCompilerTest() throws Exception {
        bc = new BFCompiler();
        cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    }
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