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85 lines
2.7 KiB
85 lines
2.7 KiB
/* ConditionalBlock (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.Instruction;
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import jode.LocalVarOperator;
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import jode.TabbedPrintWriter;
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/**
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* An ConditionalBlock is the structured block representing an if
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* instruction. The else part may be null.
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*/
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public class ConditionalBlock extends InstructionContainer {
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StructuredBlock trueBlock;
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/**
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* Creates a new if then else block. The method setThenBlock must
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* be called shortly after the creation.
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*/
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public ConditionalBlock(Instruction cond, Jump condJump, Jump elseJump) {
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super(cond, elseJump);
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if (cond instanceof LocalVarOperator) {
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LocalVarOperator varOp = (LocalVarOperator) cond;
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condJump.out.addElement(varOp.getLocalInfo());
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}
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trueBlock = new EmptyBlock(condJump);
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trueBlock.outer = this;
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}
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/* The implementation of getNext[Flow]Block is the standard
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* implementation
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*/
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/**
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* Returns all sub block of this structured block.
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*/
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public StructuredBlock[] getSubBlocks() {
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StructuredBlock[] result = { trueBlock };
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return result;
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}
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/**
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* Replaces the given sub block with a new block.
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* @param oldBlock the old sub block.
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* @param newBlock the new sub block.
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* @return false, if oldBlock wasn't a direct sub block.
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*/
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public boolean replaceSubBlock(StructuredBlock oldBlock,
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StructuredBlock newBlock) {
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if (trueBlock == oldBlock)
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trueBlock = newBlock;
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else
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return false;
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return true;
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}
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/**
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* Print the source code for this structured block. This may be
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* called only once, because it remembers which local variables
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* were declared.
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*/
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public void dumpInstruction(TabbedPrintWriter writer)
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throws java.io.IOException
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{
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writer.println("IF ("+instr.toString()+")");
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writer.tab();
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trueBlock.dumpSource(writer);
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writer.untab();
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}
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}
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