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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.
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package org.python.compiler;

import java.util.BitSet;
import java.util.Vector;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

class Code implements MethodVisitor, Opcodes {
    MethodVisitor mv;
    String sig;
    String locals[];
    int nlocals;
    int argcount;
    int returnLocal;
    BitSet finallyLocals = new java.util.BitSet();
    
    //XXX: I'd really like to get sig and access out of here since MethodVistitor
    //     should already have this information.
    public Code(MethodVisitor mv, String sig, int access) {
        this.mv = mv;
        this.sig = sig;
        nlocals = -sigSize(sig, false);
        if ((access & ACC_STATIC) != ACC_STATIC) nlocals = nlocals+1;
        argcount = nlocals;
        locals = new String[nlocals+128];
    }
    
    public int getLocal(String type) {
        //Could optimize this to skip arguments?
        for(int l = argcount; l= locals.length) {
            String[] new_locals = new String[locals.length*2];
            System.arraycopy(locals, 0, new_locals, 0, locals.length);
            locals = new_locals;
        }
        locals[nlocals] = type;
        nlocals += 1;
        return nlocals-1;
    }

    public void freeLocal(int l) {
        if (locals[l] == null) {
            System.out.println("Double free:" + l);
        }
        locals[l] = null;
    }


    public int getFinallyLocal(String type) {
        int l = getLocal(type);
        finallyLocals.set(l);
        return l;
    }

    public void freeFinallyLocal(int l) {
        finallyLocals.clear(l);
        freeLocal(l);
    }

    public int getReturnLocal() {
        if (returnLocal == 0)
            returnLocal = getLocal("return");
        return returnLocal;
    }

    public Vector getActiveLocals() {
        Vector ret = new Vector();
        ret.setSize(nlocals);
        for (int l = argcount; l= Byte.MIN_VALUE) {
            switch (value) {
            case -1:
                iconst_m1();
                break;
            case 0:
                iconst_0();
                break;
            case 1:
                iconst_1();
                break;
            case 2:
                iconst_2();
                break;
            case 3:
                iconst_3();
                break;
            case 4:
                iconst_4();
                break;
            case 5:
                iconst_5();
                break;
            default:
                bipush(value);
                break;
            }
        } else if (value <= Short.MAX_VALUE && value >= Short.MIN_VALUE) {
            sipush(value);
        } else {
            ldc(value);
        }
    }

    public void iconst_m1() {
        mv.visitInsn(ICONST_M1);
    }
    
    public void iconst_0() {
        mv.visitInsn(ICONST_0);
    }
    
    public void iconst_1() {
        mv.visitInsn(ICONST_1);
    }
    
    public void iconst_2() {
        mv.visitInsn(ICONST_2);
    }
    
    public void iconst_3() {
        mv.visitInsn(ICONST_3);
    }
    
    public void iconst_4() {
        mv.visitInsn(ICONST_4);
    }
    
    public void iconst_5() {
        mv.visitInsn(ICONST_5);
    }
    
    public void ifeq(Label label) {
        mv.visitJumpInsn(IFEQ, label);
    }

    public void ifle(Label label) {
        mv.visitJumpInsn(IFLE, label);
    }
     
    public void ifne(Label label) {
        mv.visitJumpInsn(IFNE, label);
    }

    public void ifnull(Label label) {
        mv.visitJumpInsn(IFNULL, label);
    }

    public void ifnonnull(Label label) {
        mv.visitJumpInsn(IFNONNULL, label);
    }
     
    public void if_acmpne(Label label) {
        mv.visitJumpInsn(IF_ACMPNE, label);
    }
    
    public void if_acmpeq(Label label) {
        mv.visitJumpInsn(IF_ACMPEQ, label);
    }
    
    public void if_icmple(Label label) {
        mv.visitJumpInsn(IF_ICMPLE, label);
    }
    
    public void if_icmpgt(Label label) {
        mv.visitJumpInsn(IF_ICMPGT, label);
    }
    
    public void if_icmplt(Label label) {
        mv.visitJumpInsn(IF_ICMPLT, label);
    }
    
    public void if_icmpne(Label label) {
        mv.visitJumpInsn(IF_ICMPNE, label);
    }
    
    public void if_icmpeq(Label label) {
        mv.visitJumpInsn(IF_ICMPEQ, label);
    }

    public void iadd() {
        mv.visitInsn(IADD);
    }

    public void iaload() {
        mv.visitInsn(IALOAD);
    }

    public void iinc() {
        mv.visitInsn(IINC);
    }

    public void iload(int index) {
        mv.visitVarInsn(ILOAD, index);
    }

    public void instanceof_(String type) {
        mv.visitTypeInsn(INSTANCEOF, type);
    }

    public void invokeinterface(String owner, String name, String type) {
        mv.visitMethodInsn(INVOKEINTERFACE, owner, name, type);
    }

    public void invokespecial(String owner, String name, String type) {
        mv.visitMethodInsn(INVOKESPECIAL, owner, name, type);
    }

    public void invokestatic(String owner, String name, String type) {
        mv.visitMethodInsn(INVOKESTATIC, owner, name, type);
    }
    
    public void invokevirtual(String owner, String name, String type) {
        mv.visitMethodInsn(INVOKEVIRTUAL, owner, name, type);
    }
    
    public void ireturn() {
        mv.visitInsn(IRETURN);
    }
 
    public void istore(int index) {
        mv.visitVarInsn(ISTORE, index);
    }

    public void isub() {
        mv.visitInsn(ISUB);
    }

    public void label(Label label) {
        mv.visitLabel(label);
    }

    public void lconst_0() {
        mv.visitInsn(LCONST_0);
    }

    public void ldc(Object cst) {
        if (cst instanceof String) {
            String value = (String) cst;
            final int len = value.length();
            // 65535 / 4 (max utf-8 expansion for non BMP characters)
            final int maxlen = 16000; 

            if (len > maxlen) {
                new_("java/lang/StringBuilder");
                dup();
                iconst(len);
                invokespecial("java/lang/StringBuilder", "", "(I)V");
                for (int i = 0; i < len; i += maxlen) {
                    int j = i + maxlen;
                    if (j > len) {
                        j = len;
                    }
                    mv.visitLdcInsn(value.substring(i, j));
                    invokevirtual("java/lang/StringBuilder", "append", "(Ljava/lang/String;)" + "Ljava/lang/StringBuilder;");
                }
                invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
            } else {
                mv.visitLdcInsn(value);
            }
        } else {
            mv.visitLdcInsn(cst);
        }
    }

    public void lload(int index) {
        mv.visitVarInsn(LLOAD, index);
    }

    public void lreturn() {
        mv.visitInsn(LRETURN);
    }

    public void newarray(int atype) {
        mv.visitIntInsn(NEWARRAY, atype);
    }

    public void new_(String type) {
        mv.visitTypeInsn(NEW, type);
    }

    public void nop() {
        mv.visitInsn(NOP);
    }

    public void pop() {
        mv.visitInsn(POP);
    }
    
    public void pop2() {
        mv.visitInsn(POP2);
    }

    public void putstatic(String owner, String name, String type) {
        mv.visitFieldInsn(PUTSTATIC, owner, name, type);
    }
    
    public void putfield(String owner, String name, String type) {
        mv.visitFieldInsn(PUTFIELD, owner, name, type);
    }
 
    public void ret(int index) {
        mv.visitVarInsn(RET, index);
    }

    void return_() {
        mv.visitInsn(RETURN);
    }

    public void sipush(int value) {
        mv.visitIntInsn(SIPUSH, value);
    }

    public void swap() {
        mv.visitInsn(SWAP);
    }
 
    public void swap2() {
        dup2_x2();
        pop2();
    }

    public void tableswitch(int arg0, int arg1, Label arg2, Label[] arg3) {
        mv.visitTableSwitchInsn(arg0, arg1, arg2, arg3);
    }

    public void trycatch(Label start, Label end, Label handlerStart, String type) {
        mv.visitTryCatchBlock(start, end, handlerStart, type);
    }
    
    public void setline(int line) {
        mv.visitLineNumber(line, new Label());
    }
}