Examples of org.ow2.asm.MethodVisitor.visitFrame()

org.ow2.asm.MethodVisitor.visitFrame()
Visits the current state of the local variables and operand stack elements. This method must(*) be called just before any instruction i that follows an unconditional branch instruction such as GOTO or THROW, that is the target of a jump instruction, or that starts an exception handler block. The visited types must describe the values of the local variables and of the operand stack elements just before i is executed.

(*) this is mandatory only for classes whose version is greater than or equal to {@link Opcodes#V1_6 V1_6}.

Packed frames are basically "deltas" from the state of the previous frame (very first frame is implicitly defined by the method's parameters and access flags):
- {@link Opcodes#F_SAME} representing frame with exactly the samelocals as the previous frame and with the empty stack.
- {@link Opcodes#F_SAME1}representing frame with exactly the same locals as the previous frame and with single value on the stack (nStack is 1 and stack[0] contains value for the type of the stack item).
- {@link Opcodes#F_APPEND} representing frame with current locals arethe same as the locals in the previous frame, except that additional locals are defined (nLocal is 1, 2 or 3 and local elements contains values representing added types).
- {@link Opcodes#F_CHOP} representing frame with current locals arethe same as the locals in the previous frame, except that the last 1-3 locals are absent and with the empty stack (nLocals is 1, 2 or 3).
- {@link Opcodes#F_FULL} representing complete framedata.
@param type the type of this stack map frame. Must be{@link Opcodes#F_NEW} for expanded frames, or{@link Opcodes#F_FULL}, {@link Opcodes#F_APPEND}, {@link Opcodes#F_CHOP}, {@link Opcodes#F_SAME} or{@link Opcodes#F_APPEND}, {@link Opcodes#F_SAME1} for compressedframes. @param nLocal the number of local variables in the visited frame. @param local the local variable types in this frame. This array must notbe modified. Primitive types are represented by {@link Opcodes#TOP}, {@link Opcodes#INTEGER}, {@link Opcodes#FLOAT}, {@link Opcodes#LONG}, {@link Opcodes#DOUBLE}, {@link Opcodes#NULL} or{@link Opcodes#UNINITIALIZED_THIS} (long and double arerepresented by a single element). Reference types are represented by String objects (representing internal names), and uninitialized types by Label objects (this label designates the NEW instruction that created this uninitialized value). @param nStack the number of operand stack elements in the visited frame. @param stack the operand stack types in this frame. This array must notbe modified. Its content has the same format as the "local" array. @throws IllegalStateException if a frame is visited just after anotherone, without any instruction between the two (unless this frame is a Opcodes#F_SAME frame, in which case it is silently ignored).


    public void testIllegalFrameType() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(123, 0, null, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalFrameLocalCount() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME, 1, new Object[] { INTEGER }, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalFrameStackCount() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME, 0, null, 1, new Object[] { INTEGER });
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalFrameLocalArray() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_APPEND, 1, new Object[0], 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalFrameStackArray() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_SAME1, 0, null, 1, new Object[0]);
            fail();
        } catch (Exception e) {
        }
    }

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    public void testIllegalFrameValue() {
        MethodVisitor mv = new CheckMethodAdapter(new EmptyVisitor());
        mv.visitCode();
        try {
            mv.visitFrame(F_FULL, 1, new Object[] { "LC;" }, 0, null);
            fail();
        } catch (Exception e) {
        }
        try {
            mv.visitFrame(F_FULL, 1, new Object[] { new Integer(0) }, 0, null);

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            mv.visitFrame(F_FULL, 1, new Object[] { "LC;" }, 0, null);
            fail();
        } catch (Exception e) {
        }
        try {
            mv.visitFrame(F_FULL, 1, new Object[] { new Integer(0) }, 0, null);
            fail();
        } catch (Exception e) {
        }
    }

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        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);

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        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);

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                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);

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