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74 lines
2.2 KiB
74 lines
2.2 KiB
/* BreakableBlock (c) 1998 Jochen Hoenicke
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*
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* You may distribute under the terms of the GNU General Public License.
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*
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* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
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* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
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* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
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* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
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* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
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* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* $Id$
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*/
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package jode.flow;
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import jode.TabbedPrintWriter;
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/**
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* This is a structured block, that supports break.
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*/
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public abstract class BreakableBlock extends StructuredBlock {
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boolean mayChangeJump = true;
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/**
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* Print the source code for this structured block. This handles
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* everything that is unique for all structured blocks and calls
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* dumpInstruction afterwards.
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* @param writer The tabbed print writer, where we print to.
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*/
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public void dumpSource(TabbedPrintWriter writer)
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throws java.io.IOException
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{
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if (label != null) {
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writer.untab();
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writer.println(label+":");
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writer.tab();
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}
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super.dumpSource(writer);
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}
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/**
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* The serial number for labels.
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*/
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static int serialno = 0;
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/**
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* The label of this instruction, or null if it needs no label.
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*/
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String label = null;
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/**
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* Returns the label of this block and creates a new label, if
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* there wasn't a label previously.
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*/
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public String getLabel() {
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if (label == null)
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label = "label_"+(serialno++)+"_";
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return label;
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}
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/**
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* Determines if there is a sub block, that flows through to the end
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* of this block. If this returns true, you know that jump is null.
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* @return true, if the jump may be safely changed.
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*/
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public boolean jumpMayBeChanged() {
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return mayChangeJump;
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}
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}
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