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40 lines
1.4 KiB
40 lines
1.4 KiB
/*
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* RemoveNop (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;
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public class RemoveNop implements Transformation {
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public InstructionHeader transform (InstructionHeader ih) {
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Instruction pred;
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try {
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NopOperator op = (NopOperator) ih.getInstruction();
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if (op == null)
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return null;
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ih = ih.getSimpleUniquePredecessor();
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pred = ih.getInstruction();
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if (pred == null)
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return null;
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} catch (NullPointerException ex) {
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return null;
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} catch (ClassCastException ex) {
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return null;
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}
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return ih.combine(2, pred);
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}
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}
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