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jode/jode/RemoveNop.java

40 lines
1.4 KiB

/*
* RemoveNop (c) 1998 Jochen Hoenicke
*
* You may distribute under the terms of the GNU General Public License.
*
* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* $Id$
*/
package jode;
public class RemoveNop implements Transformation {
public InstructionHeader transform (InstructionHeader ih) {
Instruction pred;
try {
NopOperator op = (NopOperator) ih.getInstruction();
if (op == null)
return null;
ih = ih.getSimpleUniquePredecessor();
pred = ih.getInstruction();
if (pred == null)
return null;
} catch (NullPointerException ex) {
return null;
} catch (ClassCastException ex) {
return null;
}
return ih.combine(2, pred);
}
}