[Biojava-l] bytecode generator - test example is broken.

[Mike May]

Hi   The latest version (1.1) in the WebCVS of test.MakeHelloWorld.java is not consistent with the latest version (1.10) of org.biojava.utils.bytecode.GeneratedCodeClass.  The constructor of GeneratedCodeClass expects an array of CodeClass whereas MakeHelloWorld passes a Set.  The same applies to createMethod().  I expect it was broken by the 1.6 change to GeneratedCodeClass.   I attach a corrected version of MakeHelloWorld.java.  Its all yours if you want it.   Would you kindly pass on my thanks to thomasd for the bytecode utility which is tremendously useful.   Regards Mike May

package test;

import org.biojava.utils.bytecode.*;

import java.util.*;
import java.io.*;

public class MakeHelloWorld {
    public static void main(String[] args) throws Exception {
	CodeClass cl_Object = IntrospectedCodeClass.forClass("java.lang.Object");
	CodeClass cl_String = IntrospectedCodeClass.forClass("java.lang.String");
	CodeClass cl_System = IntrospectedCodeClass.forClass("java.lang.System");
	CodeClass cl_PrintStream = IntrospectedCodeClass.forClass("java.io.PrintStream");
	CodeClass cl_pVoid = IntrospectedCodeClass.forClass(Void.TYPE);
	CodeClass i_Runnable = IntrospectedCodeClass.forClass(Runnable.class);
	CodeClass[] aInterfaces = { i_Runnable };
	CodeField f_System_out = cl_System.getFieldByName("out");
	CodeMethod m_PrintStream_println_I = oneIntMethod(cl_PrintStream.getMethodsByName("println"));
	CodeMethod m_Object_init = new SimpleCodeMethod("<init>", cl_Object, cl_pVoid,
							 new ArrayList(), CodeUtils.ACC_PUBLIC);
	CodeClass[] aMethodArgs = {};
	GeneratedCodeClass cc = new GeneratedCodeClass("MyTestClass",
		       IntrospectedCodeClass.forClass("java.lang.Object"),
		       aInterfaces,
		       CodeUtils.ACC_PUBLIC | CodeUtils.ACC_SUPER);

	GeneratedCodeMethod init = cc.createMethod("<init>",
						   cl_pVoid,
						   aMethodArgs,
						   CodeUtils.ACC_PUBLIC);
	InstructionVector iv = new InstructionVector();
	iv.add(ByteCode.make_aload(init.getThis()));
	iv.add(ByteCode.make_invokespecial(m_Object_init));
	iv.add(ByteCode.make_return());
	cc.setCodeGenerator(init, iv);

	GeneratedCodeMethod run = cc.createMethod("run",
						   cl_pVoid,
						   aMethodArgs,
						   CodeUtils.ACC_PUBLIC);
	iv = new InstructionVector();
	Label loopTest = new Label();
	Label loopStart = new Label();
	Label loopEnd = new Label();
	iv.add(ByteCode.make_iconst(1));
	iv.add(ByteCode.make_goto(loopStart));
	iv.add(loopTest);
        iv.add(ByteCode.make_dup());
	iv.add(ByteCode.make_iconst(10));
	iv.add(ByteCode.make_if_icmpgt(loopEnd));
	iv.add(loopStart);
	iv.add(ByteCode.make_dup());
	iv.add(ByteCode.make_getstatic(f_System_out));
	iv.add(ByteCode.make_swap());
	iv.add(ByteCode.make_invokevirtual(m_PrintStream_println_I));
	iv.add(ByteCode.make_iconst(1));
	iv.add(ByteCode.make_iadd());
	iv.add(ByteCode.make_goto(loopTest));
	iv.add(loopEnd);
	iv.add(ByteCode.make_return());

	cc.setCodeGenerator(run, iv);

	FileOutputStream fos = new FileOutputStream("MyTestClass.class");
	cc.createCode(fos);
	fos.close();
    }

    static CodeMethod oneIntMethod(Set methods) {
	CodeClass cl_pInt = IntrospectedCodeClass.forClass(Integer.TYPE);
	for (Iterator i = methods.iterator(); i.hasNext(); ) {
	    CodeMethod cm = (CodeMethod) i.next();
	    if (cm.numParameters() != 1)
		continue;
	    if (cm.getParameterType(0) == cl_pInt)
		return cm;
	}

	return null;
    }
}