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

org.objectweb.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).

      mv.visitVarInsn(ILOAD, 1);
      mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
      Label end = new Label();
      mv.visitJumpInsn(GOTO, end);
      mv.visitLabel(label);
      mv.visitFrame(F_SAME, 0, null, 0, null);
      mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
      mv.visitInsn(DUP);
      mv.visitMethodInsn(INVOKESPECIAL,
          "java/lang/IllegalArgumentException", "<init>", "()V");
      mv.visitInsn(ATHROW);

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      mv.visitInsn(DUP);
      mv.visitMethodInsn(INVOKESPECIAL,
          "java/lang/IllegalArgumentException", "<init>", "()V");
      mv.visitInsn(ATHROW);
      mv.visitLabel(end);
      mv.visitFrame(F_SAME, 0, null, 0, null);
      mv.visitInsn(RETURN);
      mv.visitMaxs(2, 2);
      mv.visitEnd();
    }
    cv.visitEnd();

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    Label l7 = new Label();
    mv.visitLabel(l7);
    Label l8 = new Label();
    mv.visitJumpInsn(GOTO, l8);
    mv.visitLabel(l5);
    mv.visitFrame(Opcodes.F_FULL, 3, new Object[] {typeName, "com/artemis/World", "com/artemis/utils/Bag"}, 0, new Object[] {});
    mv.visitVarInsn(ALOAD, 0);
    mv.visitIntInsn(SIPUSH, ClassMetadataUtil.sizeOf(meta) * 128);
    mv.visitMethodInsn(INVOKESTATIC, "java/nio/ByteBuffer", "allocateDirect", "(I)Ljava/nio/ByteBuffer;");
    mv.visitFieldInsn(PUTFIELD, typeName, "$data", "Ljava/nio/ByteBuffer;");
    Label l9 = new Label();

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    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
    mv.visitInsn(POP);
    mv.visitLabel(l8);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEVIRTUAL, "com/artemis/utils/Bag", "add", "(Ljava/lang/Object;)V");
    Label l11 = new Label();
    mv.visitLabel(l11);

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      mv.visitVarInsn(ILOAD, 2);
      mv.visitMethodInsn(INVOKESTATIC, "java/lang/Math", "max", "(II)I");
      mv.visitInsn(IMUL);
      mv.visitMethodInsn(INVOKESPECIAL, owner, "$grow", "(I)V");
      mv.visitLabel(l2);
      mv.visitFrame(Opcodes.F_APPEND,1, new Object[] {Opcodes.INTEGER}, 0, null);
      mv.visitInsn(RETURN);
      Label l4 = new Label();
      mv.visitLabel(l4);
      mv.visitLocalVariable("this", meta.type.toString(), null, l0, l4, 0);
      mv.visitLocalVariable("id", "I", null, l0, l4, 1);

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    Label l4 = new Label();
    mv.visitJumpInsn(GOTO, l4);
    Label l5 = new Label();
    mv.visitLabel(l5);


    mv.visitFrame(Opcodes.F_APPEND,3, new Object[] {"[Ljava/lang/Object;", Opcodes.INTEGER, Opcodes.INTEGER}, 0, null);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitInsn(AALOAD);
    mv.visitTypeInsn(CHECKCAST, "com/artemis/Entity");

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    Label l6 = new Label();
    mv.visitLabel(l6);


    mv.visitIincInsn(3, 1);
    mv.visitLabel(l4);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ILOAD, 4);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitJumpInsn(IF_ICMPGT, l5);
    Label l7 = new Label();
    mv.visitLabel(l7);

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    mv.visitLabel(l3);
    Label l4 = new Label();
    mv.visitJumpInsn(GOTO, l4);
    Label l5 = new Label();
    mv.visitLabel(l5);
    mv.visitFrame(Opcodes.F_APPEND,3, new Object[] {"java/nio/ByteBuffer", Opcodes.INTEGER, Opcodes.INTEGER}, 0, null);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, owner, "$data", "Ljava/nio/ByteBuffer;");
    mv.visitVarInsn(ILOAD, 3);

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    mv.visitInsn(POP);
    Label l6 = new Label();
    mv.visitLabel(l6);
    mv.visitIincInsn(3, 1);
    mv.visitLabel(l4);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ILOAD, 4);
    mv.visitVarInsn(ILOAD, 3);
    mv.visitJumpInsn(IF_ICMPGT, l5);
    Label l7 = new Label();
    mv.visitLabel(l7);

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    mv.visitVarInsn(ASTORE, 4);
    Label l8 = new Label();
    mv.visitJumpInsn(GOTO, l8);
    Label l9 = new Label();
    mv.visitLabel(l9);
    mv.visitFrame(Opcodes.F_FULL, 5, new Object[] {owner, Opcodes.INTEGER, "java/nio/ByteBuffer", Opcodes.TOP, "java/util/Iterator"}, 0, new Object[] {});
    mv.visitVarInsn(ALOAD, 4);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "next", "()Ljava/lang/Object;");
    mv.visitTypeInsn(CHECKCAST, owner);
    mv.visitVarInsn(ASTORE, 3);
    Label l10 = new Label();

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