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

                final String name,
                final String desc,
                final String signature,
                final String[] exceptions)
            {
                MethodVisitor mv = cv.visitMethod(access,
                        name,
                        desc,
                        signature,
                        exceptions);
                return new AnalyzerAdapter(owner, access, name, desc, mv);

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        cv.visitField(0, "boo", "LBoo;", null, null).visitEnd();
        cv.visitField(0, "boo1", "[LBoo;", null, null).visitEnd();
        cv.visitField(0, "s", "Ljava/lang/String;", null, null).visitEnd();
        cv.visitField(0, "i", "I", null, null).visitEnd();
        
        MethodVisitor mv;
        
        mv = cv.visitMethod(0, "foo", "()V", null, null);
        mv.visitCode();
        mv.visitFieldInsn(GETFIELD, "Doo", "boo", "LBoo;");


        mv.visitLdcInsn(Type.getType("LBoo;"));
        mv.visitLdcInsn(Type.getType("[LDoo;"));
        mv.visitLdcInsn(Type.getType("[I"));
        mv.visitLdcInsn(Type.getType("J"));
        
        mv.visitTypeInsn(ANEWARRAY, "Boo");
        mv.visitTypeInsn(ANEWARRAY, "[LDoo;");
        mv.visitTypeInsn(ANEWARRAY, "[I");
        mv.visitTypeInsn(ANEWARRAY, "J");
        
        mv.visitMultiANewArrayInsn("[[LBoo;", 2);
        mv.visitMethodInsn(INVOKEVIRTUAL,
                "Doo",
                "goo",
                "([[LBoo;LCoo;LDoo;)LCoo;");


        mv.visitFrame(Opcodes.F_NEW, 0, new Object[5], 0, new Object[10]);
        mv.visitFrame(Opcodes.F_NEW, 
                3, new Object[] { "Boo", "Coo", "Doo" },
                0, new Object[0]);
        mv.visitFrame(Opcodes.F_NEW, 
                4, new Object[] {Opcodes.INTEGER, "Coo", Opcodes.INTEGER, "Doo" }, 
                0, new Object[0]);
        mv.visitFrame(Opcodes.F_NEW, 
                2, new Object[] {Opcodes.INTEGER, Opcodes.INTEGER }, 
                0, new Object[0]);
        
        
        Label l = new Label();


        mv.visitLocalVariable("boo", "LBoo;", null, l, l, 1);
        mv.visitLocalVariable("boo1", "[LBoo;", null, l, l, 3);
        mv.visitLocalVariable("boo2", "[[LBoo;", null, l, l, 4);
        mv.visitMaxs(0, 0);
        
        mv.visitTryCatchBlock(l, l, l, "Coo");
        
        mv.visitEnd();
        
        mv = cv.visitMethod(0,
                "goo",
                "([[LBoo;LCoo;LDoo;)V",
                null,
                new String[] { "I", "J" });
        mv.visitEnd();


        cv.visitEnd();
    }

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                final String name,
                final String desc,
                final String signature,
                final String[] exceptions)
            {
                MethodVisitor mv = super.visitMethod(access,
                        name,
                        desc,
                        signature,
                        exceptions);
                return new JSRInlinerAdapter(mv,

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


    private void uninitializedLocalType(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "uninitializedLocalType",
                "(Z)V",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitTypeInsn(NEW, "java/lang/Long");
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitVarInsn(ILOAD, 1);
        Label l1 = new Label();
        mv.visitJumpInsn(IFEQ, l1);
        mv.visitInsn(LCONST_0);
        Label l2 = new Label();
        mv.visitJumpInsn(GOTO, l2);
        mv.visitFrame(F_FULL,
                3,
                new Object[] { "pkg/FrameTable", INTEGER, l0 },
                1,
                new Object[] { l0 });
        mv.visitLabel(l1);
        mv.visitInsn(LCONST_1);
        mv.visitFrame(F_FULL,
                3,
                new Object[] { "pkg/FrameTable", INTEGER, l0 },
                2,
                new Object[] { l0, LONG });
        mv.visitLabel(l2);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        mn.visitVarInsn(RET, 2);
        assertValid();
    }


    public void testSubroutineLocalsAccess() throws AnalyzerException {
        MethodVisitor mv = mn;
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        Label l3 = new Label();
        mv.visitTryCatchBlock(l0, l0, l1, null);
        mv.visitTryCatchBlock(l0, l2, l2, "java/lang/RuntimeException");
        mv.visitLabel(l0);
        mv.visitJumpInsn(JSR, l3);
        mv.visitInsn(RETURN);
        mv.visitLabel(l1);
        mv.visitVarInsn(ASTORE, 1);
        mv.visitJumpInsn(JSR, l3);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitInsn(ATHROW);
        mv.visitLabel(l3);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitVarInsn(RET, 2);
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitInsn(ATHROW);
        assertValid();
    }

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


    private void uninitializedStackType(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "uninitializedStackType",
                "(Z)V",
                null,
                null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitTypeInsn(NEW, "java/lang/Long");
        mv.visitInsn(DUP);
        mv.visitVarInsn(ILOAD, 1);
        Label l1 = new Label();
        mv.visitJumpInsn(IFEQ, l1);
        mv.visitInsn(LCONST_0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
        Label l2 = new Label();
        mv.visitJumpInsn(GOTO, l2);
        mv.visitFrame(F_FULL,
                1,
                new Object[] { "pkg/FrameTable" },
                2,
                new Object[] { l0, l0 });
        mv.visitLabel(l1);
        mv.visitInsn(LCONST_1);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "java/lang/Long" });
        mv.visitLabel(l2);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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


    private void nullType(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "nullType",
                "(Ljava/lang/String;Ljava/lang/String;)V",
                null,
                null);
        mv.visitCode();
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ALOAD, 1);
        Label l0 = new Label();
        mv.visitJumpInsn(IFNONNULL, l0);
        mv.visitVarInsn(ALOAD, 2);
        Label l1 = new Label();
        mv.visitJumpInsn(GOTO, l1);
        mv.visitFrame(F_FULL, 3, new Object[] {
            "pkg/FrameTable",
            "java/lang/String",
            NULL }, 2, new Object[] { "pkg/FrameTable", NULL });
        mv.visitLabel(l0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFrame(F_FULL, 3, new Object[] {
            "pkg/FrameTable",
            "java/lang/String",
            NULL }, 3, new Object[] {
            "pkg/FrameTable",
            NULL,
            "java/lang/String" });
        mv.visitLabel(l1);
        mv.visitMethodInsn(INVOKEVIRTUAL,
                "pkg/FrameTable",
                "nullType",
                "(Ljava/lang/String;Ljava/lang/String;)V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        ClassVisitor cv = new StaticInitMerger("$clinit$", cw);
        cv.visit(V1_1, ACC_PUBLIC, "A", null, "java/lang/Object", null);
        cv.visitField(ACC_PUBLIC + ACC_STATIC, "counter", "I", null, null);
        for (int i = 0; i < 5; ++i) {
            MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
                    "<clinit>",
                    "()V",
                    null,
                    null);
            mv.visitFieldInsn(GETSTATIC, "A", "counter", "I");
            mv.visitInsn(ICONST_1);
            mv.visitInsn(IADD);
            mv.visitFieldInsn(PUTSTATIC, "A", "counter", "I");
            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 0);
        }
        MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        cv.visitEnd();


        Class<?> c = LOADER.defineClass("A", cw.toByteArray());
        assertEquals(c.getField("counter").getInt(c.newInstance()), 5);
    }

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


    private void topType(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "topType",
                "(ZBCSIFJDLjava/lang/Object;)V",
                null,
                null);
        mv.visitCode();
        mv.visitVarInsn(ILOAD, 5);
        mv.visitVarInsn(ISTORE, 13);
        mv.visitVarInsn(ILOAD, 1);
        Label l0 = new Label();
        mv.visitJumpInsn(IFEQ, l0);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_APPEND, 2, new Object[] { TOP, INTEGER }, 0, null);
        mv.visitLabel(l0);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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


    private void arrayTypes(final ClassWriter cw) {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
                "fullFrame",
                "(Ljava/lang/String;[[Z[B[C[S[I[F[J[D[Ljava/lang/Object;)V",
                null,
                null);
        mv.visitCode();
        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.visitVarInsn(ALOAD, 1);
        Label l0 = new Label();
        mv.visitJumpInsn(IFNONNULL, l0);
        mv.visitInsn(RETURN);
        mv.visitFrame(F_FULL, 15, new Object[] {
            "pkg/FrameTable",
            "java/lang/String",
            "[[Z",
            "[B",
            "[C",
            "[S",
            "[I",
            "[F",
            "[J",
            "[D",
            "[Ljava/lang/Object;",
            LONG,
            LONG,
            LONG,
            LONG }, 0, new Object[] {});
        mv.visitLabel(l0);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

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