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.visitLabel(l10);
    mv.visitVarInsn(ALOAD, 3);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitFieldInsn(PUTFIELD, owner, "$data", "Ljava/nio/ByteBuffer;");
    mv.visitLabel(l8);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 4);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "hasNext", "()Z");
    mv.visitJumpInsn(IFNE, l9);
    Label l11 = new Label();
    mv.visitLabel(l11);

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                    "(" + Type.getDescriptor(hierarchy.getTop()) + ")V");
            mv2.visitJumpInsn(Opcodes.GOTO, aroundLabel);
            mv2.visitLabel(l5);


            if (first) {
                mv2.visitFrame(F_APPEND, 1, new Object[] { Type.getInternalName(targetClass) }, 0, null);
                first = false;
            } else {
                mv2.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            }
        }

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            if (first) {
                mv2.visitFrame(F_APPEND, 1, new Object[] { Type.getInternalName(targetClass) }, 0, null);
                first = false;
            } else {
                mv2.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            }
        }
        addErrorLogStatement(mv2);
        if (eventHierarchies.size() > 0) {
            mv2.visitLabel(aroundLabel);

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            }
        }
        addErrorLogStatement(mv2);
        if (eventHierarchies.size() > 0) {
            mv2.visitLabel(aroundLabel);
            mv2.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        }
        mv2.visitInsn(RETURN);
        Label l8 = new Label();
        mv2.visitLabel(l8);
        mv2.visitLocalVariable("pe", Type.getDescriptor(ProcessingElement.class), null, l3, l8, 1);

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      final int size = genInitializeDataField(mv, probeCount);


      // Stack[0]: [Z


      // Return the method's block array:
      mv.visitFrame(Opcodes.F_FULL, 0, new Object[0], 1, STACK_ARRZ);
      mv.visitLabel(alreadyInitialized);
      mv.visitInsn(Opcodes.ARETURN);


      mv.visitMaxs(Math.max(size, 2), 1); // Maximum local stack size is 2
      mv.visitEnd();

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      final int size = genInitializeDataField(mv);


      // Stack[0]: [Z


      // Return the method's block array:
      mv.visitFrame(Opcodes.F_FULL, 0, new Object[0], 1, STACK_ARRZ);
      mv.visitLabel(alreadyInitialized);
      mv.visitInsn(Opcodes.ARETURN);


      mv.visitMaxs(Math.max(size, 2), 1); // Maximum local stack size is 2
      mv.visitEnd();

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      final int size = genInitializeDataField(mv, probeCount);


      // Stack[0]: [Z


      // Return the class' probe array:
      mv.visitFrame(Opcodes.F_FULL, 0, NO_LOCALS, 1, STACK_ARRZ);
      mv.visitLabel(alreadyInitialized);
      mv.visitInsn(Opcodes.ARETURN);


      mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2
      mv.visitEnd();

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      final MethodVisitor mv = cv.visitMethod(
          InstrSupport.INITMETHOD_ACC, InstrSupport.INITMETHOD_NAME,
          InstrSupport.INITMETHOD_DESC, null, null);
      mv.visitCode();
      if (withFrames) {
        mv.visitFrame(Opcodes.F_NEW, 0, NO_LOCALS, 0, STACK_ARRZ);
      }


      // Load the value of the static data field:
      mv.visitFieldInsn(Opcodes.GETSTATIC, className,
          InstrSupport.DATAFIELD_NAME, InstrSupport.DATAFIELD_DESC);

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      // Stack[0]: [Z


      // Return the class' probe array:
      if (withFrames) {
        mv.visitFrame(Opcodes.F_NEW, 0, NO_LOCALS, 1, STACK_ARRZ);
      }
      mv.visitLabel(alreadyInitialized);
      mv.visitInsn(Opcodes.ARETURN);


      mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2

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      final int size = genInitializeDataField(mv, probeCount);


      // Stack[0]: [Z


      // Return the class' probe array:
      mv.visitFrame(Opcodes.F_FULL, 0, NO_LOCALS, 1, STACK_ARRZ);
      mv.visitLabel(alreadyInitialized);
      mv.visitInsn(Opcodes.ARETURN);


      mv.visitMaxs(Math.max(size, 2), 0); // Maximum local stack size is 2
      mv.visitEnd();

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