Examples of org.ow2.asm.MethodVisitor

org.ow2.asm.MethodVisitor
A visitor to visit a Java method. The methods of this interface must be called in the following order: [ visitAnnotationDefault ] ( visitAnnotation | visitParameterAnnotation | visitAttribute )* [ visitCode ( visitFrame | visitXInsn | visitLabel | visitTryCatchBlock | visitLocalVariable | visitLineNumber)* visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, visitTryCatchBlock must be called before the labels passed as arguments have been visited, and the visitLocalVariable and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton

                "Interface",
                "<E:Ljava/lang/Object;>Ljava/lang/Object;",
                "java/lang/Object",
                null);


        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT,
                "m",
                "(ZBCSIFJDLjava/lang/Object;)Ljava/lang/Object;",
                "(ZBCSIFJDTE;)TE;",
                null);
        mv.visitEnd();


        cw.visitEnd();


        return cw.toByteArray();
    }

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        return cw.toByteArray();
    }


    public byte[] dumpBackwardJSR() {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        MethodVisitor mv;


        cw.visit(V1_1, ACC_PUBLIC, "pkg/JSR2", null, "java/lang/Object", null);


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


        mv = cw.visitMethod(ACC_PUBLIC, "backwardJSR", "([I)V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        Label l3 = new Label();
        Label l4 = new Label();
        Label l5 = new Label();
        Label l6 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, null);
        mv.visitTryCatchBlock(l2, l3, l2, null);
        mv.visitInsn(ICONST_0);
        mv.visitVarInsn(ISTORE, 4);
        mv.visitJumpInsn(GOTO, l0);
        mv.visitLabel(l4);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitIincInsn(4, 1);
        mv.visitVarInsn(RET, 3);


        /* extra instructions only used to trigger method resizing */
        mv.visitLabel(l0);
        mv.visitInsn(ACONST_NULL);
        mv.visitJumpInsn(IFNULL, l6); // will give wide IFNULL
        // many NOPs will be introduced here by the method resizing test
        mv.visitJumpInsn(GOTO, l6);
        mv.visitLabel(l6);


        mv.visitJumpInsn(JSR, l4); // backward JSR, will give JSR_W
        mv.visitLabel(l1);
        mv.visitJumpInsn(GOTO, l5);
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitJumpInsn(JSR, l4);
        mv.visitLabel(l3);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitInsn(ATHROW);
        mv.visitLabel(l5);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();


        cw.visitEnd();


        return cw.toByteArray();
    }

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                desc.append("Ljava/lang/Object;");
            }
            desc.append(")Ljava/lang/Object;");
            
            // eval method
            MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC,
                    "eval",
                    desc.toString(),
                    null,
                    null);
            compile(mv);
            mv.visitInsn(ARETURN);
            // max stack and max locals automatically computed
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            return cw.toByteArray();
        }

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        final String name,
        final String desc,
        final String signature,
        final String[] exceptions)
    {
        MethodVisitor mv = cv.visitMethod(access,
                name,
                desc,
                signature,
                exceptions);
        if (mv != null) {
            mv.visitAttribute(new CommentAttribute("this is a method comment"));
        }
        return mv;
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void sameLocals1stackItemFrame(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "sameLocals1stackItemFrame",
                "()I",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        mv.visitTryCatchBlock(l0, l1, l0, null);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Throwable" });
        mv.visitLabel(l0);
        mv.visitVarInsn(ASTORE, 1);
        mv.visitLabel(l1);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void sameLocals1stackItemFrame2(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "sameLocals1stackItemFrame2",
                "()V",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
        Label l3 = new Label();
        mv.visitTryCatchBlock(l0, l1, l3, null);
        Label l4 = new Label();
        mv.visitTryCatchBlock(l2, l4, l3, null);
        Label l5 = new Label();
        mv.visitTryCatchBlock(l3, l5, l3, null);
        mv.visitLabel(l0);
        mv.visitTypeInsn(NEW, "java/lang/Object");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitVarInsn(ASTORE, 1);
        mv.visitLabel(l1);
        Label l6 = new Label();
        mv.visitJumpInsn(GOTO, l6);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Exception" });
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitLabel(l4);
        mv.visitJumpInsn(GOTO, l6);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Throwable" });
        mv.visitLabel(l3);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitLabel(l5);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitInsn(ATHROW);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitLabel(l6);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void sameLocals1stackItemFrameExtended(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "sameLocals1stackItemFrameExtended",
                "()I",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, null);
        Label l3 = new Label();
        mv.visitTryCatchBlock(l2, l3, l2, null);
        mv.visitLabel(l0);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 1);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 3);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 5);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 7);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 9);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 11);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 13);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 15);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 17);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 19);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 21);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 23);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 25);
        mv.visitLabel(l1);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Throwable" });
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 27);
        mv.visitLabel(l3);
        mv.visitInsn(ICONST_0);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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                Opcodes.ACC_PUBLIC,
                "C",
                null,
                "java/lang/Object",
                null);
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        mv.visitCode();
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL,
                "java/lang/Object",
                "<init>",
                "()V");
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
        ((MethodNode) this.current).accept(cw);
        cw.visitEnd();
        byte[] b = cw.toByteArray();
        try {
            TestClassLoader loader = new TestClassLoader();

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void sameFrameExtended(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "sameFrameExtended",
                "(Z)V",
                null,
                null);
        mv.visitCode();
        mv.visitFrame(F_SAME, 0, null, 0, null);
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 2);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 4);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 6);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 8);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 10);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 12);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 14);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 16);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 18);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 20);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 22);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 24);
        mv.visitLdcInsn(new Long(11L));
        mv.visitVarInsn(LSTORE, 26);
        mv.visitVarInsn(ILOAD, 1);
        Label l1 = new Label();
        mv.visitJumpInsn(IFEQ, l1);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitLabel(l1);
        mv.visitJumpInsn(GOTO, l0);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }


    private void deadCode(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "deadCode",
                "(Z)V",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        Label l3 = new Label();
        mv.visitTryCatchBlock(l0, l1, l1, "java/lang/Exception");
        mv.visitTryCatchBlock(l2, l3, l3, "java/lang/Exception");
        mv.visitJumpInsn(GOTO, l2);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitLabel(l0);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Exception" });
        mv.visitLabel(l1);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_FULL,
                0,
                new Object[] { "pkg/FrameTable", INTEGER },
                0,
                null);
        mv.visitLabel(l2);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_SAME1,
                0,
                null,
                1,
                new Object[] { "java/lang/Exception" });
        mv.visitLabel(l3);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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