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).

      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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            StringBuilder buffer = new StringBuilder(128);
            for (int i = 0; i < n; i++) {
              mv.visitLabel(labels[i]);
              if (i == 0)
                mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] {classNameInternal}, 0, null);
              else
                mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
              mv.visitVarInsn(ALOAD, 4);


              buffer.setLength(0);

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            for (int i = 0; i < n; i++) {
              mv.visitLabel(labels[i]);
              if (i == 0)
                mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] {classNameInternal}, 0, null);
              else
                mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
              mv.visitVarInsn(ALOAD, 4);


              buffer.setLength(0);
              buffer.append('(');

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      for (int i = 0, n = labels.length; i < n; i++) {
        Field field = fields.get(i);
        Type fieldType = Type.getType(field.getType());


        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, classNameInternal);
        mv.visitVarInsn(ALOAD, 3);


        switch (fieldType.getSort()) {

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        mv.visitFieldInsn(PUTFIELD, classNameInternal, field.getName(), fieldType.getDescriptor());
        mv.visitInsn(RETURN);
      }


      mv.visitLabel(defaultLabel);
      mv.visitFrame(F_SAME, 0, null, 0, null);
    }
    mv = insertThrowExceptionForFieldNotFound(mv);
    mv.visitMaxs(maxStack, 4);
    mv.visitEnd();
  }

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      for (int i = 0, n = labels.length; i < n; i++) {
        Field field = fields.get(i);


        mv.visitLabel(labels[i]);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, classNameInternal);
        mv.visitFieldInsn(GETFIELD, classNameInternal, field.getName(), Type.getDescriptor(field.getType()));


        Type fieldType = Type.getType(field.getType());

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        mv.visitInsn(ARETURN);
      }


      mv.visitLabel(defaultLabel);
      mv.visitFrame(F_SAME, 0, null, 0, null);
    }
    insertThrowExceptionForFieldNotFound(mv);
    mv.visitMaxs(maxStack, 3);
    mv.visitEnd();
  }

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      mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);


      for (int i = 0, n = labels.length; i < n; i++) {
        if (!labels[i].equals(labelForInvalidTypes)) {
          mv.visitLabel(labels[i]);
          mv.visitFrame(F_SAME, 0, null, 0, null);
          mv.visitVarInsn(ALOAD, 1);
          mv.visitTypeInsn(CHECKCAST, classNameInternal);
          mv.visitFieldInsn(GETFIELD, classNameInternal, fields.get(i).getName(), "Ljava/lang/String;");
          mv.visitInsn(ARETURN);
        }

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        }
      }
      // Rest of fields: different type
      if (hasAnyBadTypeLabel) {
        mv.visitLabel(labelForInvalidTypes);
        mv.visitFrame(F_SAME, 0, null, 0, null);
        insertThrowExceptionForFieldType(mv, "String");
      }
      // Default: field not found
      mv.visitLabel(defaultLabel);
      mv.visitFrame(F_SAME, 0, null, 0, null);

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