suneido.compiler.TestAsm.java Source code

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Here is the source code for suneido.compiler.TestAsm.java

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/* Copyright 2010 (c) Suneido Software Corp. All rights reserved.
 * Licensed under GPLv2.
 */

package suneido.compiler;

import java.util.List;

import org.objectweb.asm.*;
import org.objectweb.asm.util.CheckClassAdapter;

import suneido.runtime.BlockReturnException;
import suneido.runtime.Ops;
import suneido.runtime.SuCallBase;

public class TestAsm implements Opcodes {

    private static class SampleFunction extends SuCallBase {
        private static final Object c;

        static {
            List<Object> constants = ClassGen.shareConstants.get();
            c = constants.get(0);
        }

        @Override
        public Object call(Object... args) {
            try {
                throw Ops.blockReturnException(c, 123);
            } catch (BlockReturnException e) {
                return Ops.blockReturnHandler(e, 123);
            }
        }

    }

    public static void main(String[] args) throws Exception {

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
        ClassVisitor cv = new CheckClassAdapter(cw);
        MethodVisitor mv;

        cv.visit(V1_6, ACC_PUBLIC + ACC_SUPER, Type.getInternalName(SampleFunction.class), null,
                Type.getInternalName(SuCallBase.class), null);
        mv = cv.visitMethod(ACC_PUBLIC + ACC_VARARGS, "call",
                "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
        Label l3 = new Label();
        mv.visitLabel(l3);
        mv.visitLocalVariable("this", Type.getDescriptor(SampleFunction.class), null, l0, l3, 0);
        mv.visitLocalVariable("self", "Ljava/lang/Object;", null, l0, l3, 1);
        mv.visitLocalVariable("args", "[Ljava/lang/Object;", null, l0, l3, 2);
        mv.visitMaxs(0, 0);
        mv.visitEnd();

        cv.visitEnd();
    }

}