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55 lines
1.8 KiB
55 lines
1.8 KiB
/*
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* CreateExpression (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 CreateExpression implements Transformation {
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public InstructionHeader transform(InstructionHeader ih) {
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Operator op;
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Expression exprs[];
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int params;
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try {
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op = (Operator) ih.getInstruction();
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params = op.getOperandCount();
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exprs = new Expression[params];
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for (int i = params-1; i>=0; i--) {
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ih = ih.getSimpleUniquePredecessor();
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exprs[i] = (Expression) ih.getInstruction();
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if (exprs[i].isVoid()) {
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if (i == params-1)
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return null;
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Expression e = exprs[i+1].tryToCombine(exprs[i]);
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if (e == null)
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return null;
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i++;
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exprs[i] = e;
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ih = ih.combine(2, e);
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}
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}
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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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if(Decompiler.isVerbose && params > 0)
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System.err.print("x");
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return ih.combine(params+1, new Expression(op, exprs));
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}
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}
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