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110 lines
3.5 KiB
110 lines
3.5 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.flow;
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import jode.Operator;
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import jode.Expression;
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/**
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* This transformation creates expressions. It transforms
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* <pre>
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* Sequ[expr_1, Sequ[expr_2, ..., Sequ[expr_n, op] ...]]
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* </pre>
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* to
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* <pre>
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* expr(op, [ expr_1, ..., expr_n ])
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* </pre>
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*/
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public class CreateExpression implements Transformation {
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/**
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* This does the transformation.
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* @param FlowBlock the flow block to transform.
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* @return true if flow block was simplified.
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*/
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public boolean transform(FlowBlock flow) {
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Operator op;
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Expression exprs[];
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int params;
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StructuredBlock block;
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try {
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System.err.println("Transformation on: "+flow.getLabel());
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flow.checkConsistent();
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} catch (RuntimeException ex) {
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try {
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jode.TabbedPrintWriter writer =
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new jode.TabbedPrintWriter(System.err, " ");
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writer.tab();
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flow.block.dumpSource(writer);
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} catch (java.io.IOException ioex) {
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}
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}
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try {
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SequentialBlock sequBlock;
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block = flow.lastModified;
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op = (Operator) ((InstructionContainer)block).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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sequBlock = (SequentialBlock)block.outer;
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if (i == params-1 &&
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sequBlock.getSubBlocks()[1] != block)
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return false;
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block = sequBlock.getSubBlocks()[0];
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if (block.jump != null)
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return false;
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exprs[i] =
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(Expression) ((InstructionBlock)block).getInstruction();
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if (exprs[i].isVoid()) {
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if (i == params-1)
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return false;
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Expression e = exprs[i+1].tryToCombine(exprs[i]);
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if (e == null)
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return false;
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i++;
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SequentialBlock subExprBlock =
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(SequentialBlock) sequBlock.getSubBlocks()[1];
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subExprBlock.replace(sequBlock);
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sequBlock = subExprBlock;
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((InstructionContainer)subExprBlock.getSubBlocks()[0]).
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setInstruction(e);
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exprs[i] = e;
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}
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block = sequBlock;
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}
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} catch (NullPointerException ex) {
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return false;
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} catch (ClassCastException ex) {
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return false;
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}
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if(jode.Decompiler.isVerbose && params > 0)
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System.err.print("x");
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((InstructionContainer) flow.lastModified).setInstruction
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(new Expression(op, exprs));
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flow.lastModified.replace(block);
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return true;
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}
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}
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