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73 lines
2.2 KiB
73 lines
2.2 KiB
/*
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* Expression (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 abstract class Expression extends Instruction {
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ComplexExpression parent = null;
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public Expression(Type type) {
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super (type);
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}
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/**
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* Get the number of operands.
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* @return The number of stack entries this expression needs.
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*/
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public abstract int getOperandCount();
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public Expression negate() {
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Operator negop =
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new UnaryOperator(Type.tBoolean, Operator.LOG_NOT_OP);
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return new ComplexExpression(negop, new Expression[] { this });
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}
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public Expression tryToCombine(Expression e) {
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if (e instanceof ComplexExpression
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&& e.getOperator() instanceof StoreInstruction) {
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ComplexExpression ce = (ComplexExpression) e;
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StoreInstruction store = (StoreInstruction) e.getOperator();
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if (store.matches(getOperator())
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&& ce.subExpressions.length == 1) {
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return new ComplexExpression
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(new AssignOperator(store.getOperatorIndex(), store),
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ce.subExpressions);
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}
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}
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return null;
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}
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Expression simplifyStringBuffer() {
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return null;
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}
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public abstract Operator getOperator();
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String toString(int minPriority) {
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String result = toString();
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if (getOperator().getPriority() < minPriority)
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return "("+result+")";
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return result;
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}
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public boolean isVoid() {
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return getType() == Type.tVoid;
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}
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}
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