org.evosuite.symbolic.solver.z3str2.ExprToZ3Str2Visitor Maven / Gradle / Ivy
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/**
* Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see {
@Override
public SmtExpr visit(IntegerBinaryExpression e, Void v) {
SmtExpr left = e.getLeftOperand().accept(this, null);
SmtExpr right = e.getRightOperand().accept(this, null);
if (left == null || right == null) {
return null;
}
if (!left.isSymbolic() && !right.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
switch (e.getOperator()) {
case DIV: {
return SmtExprBuilder.mkIntDiv(left, right);
}
case MUL: {
return SmtExprBuilder.mkMul(left, right);
}
case MINUS: {
return SmtExprBuilder.mkSub(left, right);
}
case PLUS: {
return SmtExprBuilder.mkAdd(left, right);
}
case REM: {
return SmtExprBuilder.mkRem(left, right);
}
case IOR: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvor = SmtExprBuilder.mkBVOR(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvor);
return ret_val;
}
case IAND: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvand = SmtExprBuilder.mkBVAND(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvand);
return ret_val;
}
case IXOR: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvxor = SmtExprBuilder.mkBVXOR(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvxor);
return ret_val;
}
case SHL: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvshl = SmtExprBuilder.mkBVSHL(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvshl);
return ret_val;
}
case USHR: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvlshr = SmtExprBuilder.mkBVLSHR(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvlshr);
return ret_val;
}
case SHR: {
SmtExpr bv_left = SmtExprBuilder.mkInt2BV(32, left);
SmtExpr bv_right = SmtExprBuilder.mkInt2BV(32, right);
SmtExpr bvashr = SmtExprBuilder.mkBVASHR(bv_left, bv_right);
SmtExpr ret_val = SmtExprBuilder.mkBV2Int(bvashr);
return ret_val;
}
case MAX: {
SmtExpr left_gt_right = SmtExprBuilder.mkGt(left, right);
SmtExpr ite_expr = SmtExprBuilder.mkITE(left_gt_right, left, right);
return ite_expr;
}
case MIN: {
SmtExpr left_gt_right = SmtExprBuilder.mkLt(left, right);
SmtExpr ite_expr = SmtExprBuilder.mkITE(left_gt_right, left, right);
return ite_expr;
}
default: {
throw new UnsupportedOperationException("Not implemented yet! " + e.getOperator());
}
}
}
@Override
public SmtExpr visit(IntegerComparison e, Void v) {
throw new IllegalStateException("IntegerComparison should be removed during normalization");
}
@Override
public SmtExpr visit(IntegerConstant e, Void v) {
long concreteValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(concreteValue);
}
@Override
public SmtExpr visit(IntegerToRealCast e, Void v) {
SmtExpr operand = e.getArgument().accept(this, null);
if (operand == null) {
return null;
}
if (!operand.isSymbolic()) {
double doubleVal = e.getConcreteValue();
return mkRepresentableRealConstant(doubleVal);
}
return SmtExprBuilder.mkInt2Real(operand);
}
@Override
public SmtExpr visit(IntegerToStringCast e, Void v) {
String stringValue = e.getConcreteValue();
return mkStringConstant(stringValue);
}
@Override
public SmtExpr visit(IntegerUnaryExpression e, Void v) {
SmtExpr intExpr = e.getOperand().accept(this, null);
if (intExpr == null) {
return null;
}
if (!intExpr.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
switch (e.getOperator()) {
case NEG: {
SmtExpr minus_expr = SmtExprBuilder.mkNeg(intExpr);
return minus_expr;
}
case GETNUMERICVALUE:
case ISDIGIT:
case ISLETTER: {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
case ABS:
SmtExpr zero = SmtExprBuilder.mkIntConstant(0);
SmtExpr gte_than_zero = SmtExprBuilder.mkGe(intExpr, zero);
SmtExpr minus_expr = SmtExprBuilder.mkNeg(intExpr);
SmtExpr ite_expr = SmtExprBuilder.mkITE(gte_than_zero, intExpr, minus_expr);
return ite_expr;
default:
throw new UnsupportedOperationException("Not implemented yet!" + e.getOperator());
}
}
@Override
public SmtExpr visit(IntegerVariable e, Void v) {
String varName = e.getName();
return SmtExprBuilder.mkIntVariable(varName);
}
@Override
public SmtExpr visit(RealToIntegerCast n, Void arg) {
SmtExpr operandExpr = n.getArgument().accept(this, null);
if (operandExpr == null) {
return null;
}
if (!operandExpr.isSymbolic()) {
long longValue = n.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
SmtExpr realToIntStr = SmtExprBuilder.mkReal2Int(operandExpr);
return realToIntStr;
}
@Override
public SmtExpr visit(RealUnaryToIntegerExpression e, Void arg) {
SmtExpr realExpr = e.getOperand().accept(this, null);
if (realExpr == null) {
return null;
}
if (!realExpr.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
switch (e.getOperator()) {
case ROUND: {
SmtExpr smtExpr = SmtExprBuilder.mkReal2Int(realExpr);
return smtExpr;
}
case GETEXPONENT: {
long longObject = e.getConcreteValue();
SmtExpr intConst = SmtExprBuilder.mkIntConstant(longObject);
return intConst;
}
default:
throw new UnsupportedOperationException("Not implemented yet!");
}
}
@Override
public SmtExpr visit(RealBinaryExpression e, Void arg) {
SmtExpr left = e.getLeftOperand().accept(this, null);
SmtExpr right = e.getRightOperand().accept(this, null);
if (left == null || right == null) {
return null;
}
if (!left.isSymbolic() && !right.isSymbolic()) {
double doubleValue = e.getConcreteValue();
return mkRepresentableRealConstant(doubleValue);
}
switch (e.getOperator()) {
case DIV: {
SmtExpr divExpr = SmtExprBuilder.mkRealDiv(left, right);
return divExpr;
}
case MUL: {
SmtExpr mulExpr = SmtExprBuilder.mkMul(left, right);
return mulExpr;
}
case MINUS: {
SmtExpr subExpr = SmtExprBuilder.mkSub(left, right);
return subExpr;
}
case PLUS: {
SmtExpr addExpr = SmtExprBuilder.mkAdd(left, right);
return addExpr;
}
case MAX: {
SmtExpr left_gt_right = SmtExprBuilder.mkGt(left, right);
SmtExpr ite_expr = SmtExprBuilder.mkITE(left_gt_right, left, right);
return ite_expr;
}
case MIN: {
SmtExpr left_gt_right = SmtExprBuilder.mkLt(left, right);
SmtExpr ite_expr = SmtExprBuilder.mkITE(left_gt_right, left, right);
return ite_expr;
}
case ATAN2:
case COPYSIGN:
case HYPOT:
case NEXTAFTER:
case POW:
case SCALB:
case IEEEREMAINDER:
case REM: {
Double concreteValue = e.getConcreteValue();
if (!isRepresentable(concreteValue)) {
return null;
} else {
return SmtExprBuilder.mkRealConstant(concreteValue);
}
}
default: {
throw new UnsupportedOperationException("Not implemented yet! " + e.getOperator());
}
}
}
private static SmtExpr mkRepresentableRealConstant(double doubleValue) {
if (isRepresentable(doubleValue)) {
return SmtExprBuilder.mkRealConstant(doubleValue);
} else {
return null;
}
}
private static boolean isRepresentable(Double doubleVal) {
return !doubleVal.isNaN() && !doubleVal.isInfinite();
}
@Override
public SmtExpr visit(RealConstant n, Void arg) {
double doubleValue = n.getConcreteValue();
return mkRepresentableRealConstant(doubleValue);
}
@Override
public SmtExpr visit(RealUnaryExpression e, Void arg) {
SmtExpr intExpr = e.getOperand().accept(this, null);
if (intExpr == null) {
return null;
}
if (!intExpr.isSymbolic()) {
double doubleValue = e.getConcreteValue();
return mkRepresentableRealConstant(doubleValue);
}
switch (e.getOperator()) {
case ABS: {
SmtExpr zero_rational = SmtExprBuilder.mkRealConstant(0.0);
SmtExpr gte_than_zero = SmtExprBuilder.mkGe(intExpr, zero_rational);
SmtExpr minus_expr = SmtExprBuilder.mkNeg(intExpr);
SmtExpr ite_expr = SmtExprBuilder.mkITE(gte_than_zero, intExpr, minus_expr);
return ite_expr;
}
// trigonometric
case ACOS:
case ASIN:
case ATAN:
case COS:
case COSH:
case SIN:
case SINH:
case TAN:
case TANH:
// other functions
case CBRT:
case CEIL:
case EXP:
case EXPM1:
case FLOOR:
case GETEXPONENT:
case LOG:
case LOG10:
case LOG1P:
case NEXTUP:
case RINT:
case ROUND:
case SIGNUM:
case SQRT:
case TODEGREES:
case TORADIANS:
case ULP: {
double doubleValue = e.getConcreteValue();
return mkRepresentableRealConstant(doubleValue);
}
default:
throw new UnsupportedOperationException("Not implemented yet!");
}
}
@Override
public SmtExpr visit(RealVariable n, Void arg) {
String varName = n.getName();
return SmtExprBuilder.mkRealVariable(varName);
}
@Override
public SmtExpr visit(StringReaderExpr e, Void arg) {
long longValue = e.getConcreteValue();
SmtExpr intConst = SmtExprBuilder.mkIntConstant(longValue);
return intConst;
}
@Override
public SmtExpr visit(StringBinaryExpression e, Void arg) {
SmtExpr left = e.getLeftOperand().accept(this, null);
SmtExpr right = e.getRightOperand().accept(this, null);
Operator op = e.getOperator();
if (left == null || right == null) {
return null;
}
if (!left.isSymbolic() && !right.isSymbolic()) {
String stringValue = e.getConcreteValue();
return mkStringConstant(stringValue);
}
switch (op) {
case APPEND_BOOLEAN:
case APPEND_CHAR:
case APPEND_INTEGER: {
long longValue = (Long) e.getRightOperand().getConcreteValue();
String concreteRight = String.valueOf(longValue);
SmtExpr concreteRightConstant = mkStringConstant(concreteRight);
return SmtExprBuilder.mkConcat(left, concreteRightConstant);
}
case APPEND_REAL: {
double doubleValue = (Double) e.getRightOperand().getConcreteValue();
String concreteRight = String.valueOf(doubleValue);
SmtExpr concreteRightConstant = mkStringConstant(concreteRight);
return SmtExprBuilder.mkConcat(left, concreteRightConstant);
}
case APPEND_STRING:
case CONCAT: {
return SmtExprBuilder.mkConcat(left, right);
}
default: {
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
}
@Override
public SmtExpr visit(StringConstant n, Void arg) {
String stringValue = n.getConcreteValue();
return mkStringConstant(stringValue);
}
public static String encodeString(String str) {
char[] charArray = str.toCharArray();
String ret_val = "__cOnStStR_";
for (int i = 0; i < charArray.length; i++) {
char c = charArray[i];
if (c >= 0 && c <= 255) {
if (Integer.toHexString(c).length() == 1) {
// padding
ret_val += "_x0" + Integer.toHexString(c);
} else {
ret_val += "_x" + Integer.toHexString(c);
}
}
}
return ret_val;
}
private static SmtExpr mkStringConstant(String stringValue) {
String encodedStr = encodeString(stringValue);
return SmtExprBuilder.mkStringVariable(encodedStr);
}
@Override
public SmtExpr visit(StringMultipleExpression e, Void arg) {
Expression leftOperand = e.getLeftOperand();
Expression rightOperand = e.getRightOperand();
Operator op = e.getOperator();
ArrayList> othersOperands = e.getOther();
SmtExpr left = leftOperand.accept(this, null);
SmtExpr right = rightOperand.accept(this, null);
List others = new LinkedList();
for (Expression otherOperand : othersOperands) {
SmtExpr other = otherOperand.accept(this, null);
others.add(other);
}
if (left == null || right == null) {
return null;
}
for (SmtExpr expr : others) {
if (expr == null) {
return null;
}
}
if (!left.isSymbolic() && !right.isSymbolic()) {
boolean isSymbolic = false;
for (SmtExpr smtExpr : others) {
if (smtExpr.isSymbolic()) {
isSymbolic = true;
}
}
if (!isSymbolic) {
String stringValue = e.getConcreteValue();
return mkStringConstant(stringValue);
}
}
switch (op) {
case REPLACECS: {
SmtExpr string = left;
SmtExpr target = right;
SmtExpr replacement = others.get(0);
SmtExpr substringExpr = SmtExprBuilder.mkReplace(string, target, replacement);
return substringExpr;
}
case SUBSTRING: {
SmtExpr string = left;
SmtExpr fromExpr = right;
SmtExpr toExpr = others.get(0);
SmtExpr substringExpr = SmtExprBuilder.mkSubstring(string, fromExpr, toExpr);
return substringExpr;
}
case REPLACEC:
case REPLACEALL:
case REPLACEFIRST: {
String stringValue = e.getConcreteValue();
return mkStringConstant(stringValue);
}
default:
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
@Override
public SmtExpr visit(StringUnaryExpression e, Void arg) {
Operator op = e.getOperator();
switch (op) {
case TRIM:
case TOLOWERCASE:
case TOUPPERCASE: {
String stringValue = e.getConcreteValue();
return mkStringConstant(stringValue);
}
default:
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
@Override
public SmtExpr visit(StringVariable e, Void arg) {
String varName = e.getName();
return SmtExprBuilder.mkStringVariable(varName);
}
@Override
public SmtExpr visit(HasMoreTokensExpr e, Void arg) {
long longValue = e.getConcreteValue();
SmtExpr intConst = SmtExprBuilder.mkIntConstant(longValue);
return intConst;
}
@Override
public SmtExpr visit(StringNextTokenExpr n, Void arg) {
String stringValue = n.getConcreteValue();
return mkStringConstant(stringValue);
}
@Override
public SmtExpr visit(RealComparison n, Void arg) {
throw new IllegalStateException("RealComparison should be removed during normalization");
}
@Override
public SmtExpr visit(StringBinaryComparison e, Void arg) {
Expression leftOperand = e.getLeftOperand();
Expression rightOperand = e.getRightOperand();
Operator op = e.getOperator();
SmtExpr left = leftOperand.accept(this, null);
SmtExpr right = rightOperand.accept(this, null);
if (left == null || right == null) {
return null;
}
if (!left.isSymbolic() && !right.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
switch (op) {
case EQUALS: {
SmtExpr equalsFormula = SmtExprBuilder.mkEq(left, right);
SmtExpr ifThenElseExpr = SmtExprBuilder.mkITE(equalsFormula, SmtExprBuilder.ONE_INT,
SmtExprBuilder.ZERO_INT);
return ifThenElseExpr;
}
case ENDSWITH: {
SmtExpr endsWithExpr = SmtExprBuilder.mkEndsWith(left, right);
SmtExpr ifThenElseExpr = SmtExprBuilder.mkITE(endsWithExpr, SmtExprBuilder.ONE_INT,
SmtExprBuilder.ZERO_INT);
return ifThenElseExpr;
}
case CONTAINS: {
SmtExpr containsExpr = SmtExprBuilder.mkContains(left, right);
SmtExpr ifThenElseExpr = SmtExprBuilder.mkITE(containsExpr, SmtExprBuilder.ONE_INT,
SmtExprBuilder.ZERO_INT);
return ifThenElseExpr;
}
case STARTSWITH: {
SmtExpr startsWithExpr = SmtExprBuilder.mkStartsWith(left, right);
SmtExpr eqTrue = SmtExprBuilder.mkEq(startsWithExpr, SmtExprBuilder.TRUE);
SmtExpr ifThenElseExpr = SmtExprBuilder.mkITE(eqTrue, SmtExprBuilder.ONE_INT, SmtExprBuilder.ZERO_INT);
return ifThenElseExpr;
}
case EQUALSIGNORECASE:
case REGIONMATCHES:
case PATTERNMATCHES:
case APACHE_ORO_PATTERN_MATCHES: {
long longValue = e.getConcreteValue();
SmtExpr intConst = SmtExprBuilder.mkIntConstant(longValue);
return intConst;
}
default:
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
@Override
public SmtExpr visit(StringBinaryToIntegerExpression e, Void arg) {
Expression leftOperand = e.getLeftOperand();
Operator op = e.getOperator();
Expression rightOperand = e.getRightOperand();
SmtExpr left = leftOperand.accept(this, null);
SmtExpr right = rightOperand.accept(this, null);
if (left == null || right == null) {
return null;
}
if (!left.isSymbolic() && !right.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
switch (op) {
case INDEXOFS: {
SmtExpr indexOfExpr = SmtExprBuilder.mkIndexOf(left, right);
return indexOfExpr;
}
case CHARAT: {
SmtExpr startExpr = right;
SmtExpr lengthExpr = SmtExprBuilder.ONE_INT;
SmtExpr charAtExpr = SmtExprBuilder.mkSubstring(left, startExpr, lengthExpr);
SmtExpr charToInt = SmtExprBuilder.mkCharToInt(charAtExpr);
return charToInt;
}
case INDEXOFC:
case LASTINDEXOFC:
case LASTINDEXOFS:
case COMPARETO:
case COMPARETOIGNORECASE: {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
default: {
throw new UnsupportedOperationException("Not implemented yet!" + e.getOperator());
}
}
}
@Override
public SmtExpr visit(StringMultipleComparison e, Void arg) {
Expression leftOperand = e.getLeftOperand();
Expression rightOperand = e.getRightOperand();
Operator op = e.getOperator();
ArrayList> othersOperands = e.getOther();
SmtExpr left = leftOperand.accept(this, null);
SmtExpr right = rightOperand.accept(this, null);
List others = new LinkedList();
for (Expression otherOperand : othersOperands) {
SmtExpr other = otherOperand.accept(this, null);
others.add(other);
}
if (left == null || right == null) {
return null;
}
for (SmtExpr expr : others) {
if (expr == null) {
return null;
}
}
if (!left.isSymbolic() && !right.isSymbolic()) {
boolean isSymbolic = false;
for (SmtExpr smtExpr : others) {
if (smtExpr.isSymbolic()) {
isSymbolic = true;
break;
}
}
if (!isSymbolic) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
}
switch (op) {
case STARTSWITH: {
// discard index (over-approximate solution)
SmtExpr startsWithExpr = SmtExprBuilder.mkStartsWith(left, right);
SmtExpr ifThenElseExpr = SmtExprBuilder.mkITE(startsWithExpr, SmtExprBuilder.ONE_INT,
SmtExprBuilder.ZERO_INT);
return ifThenElseExpr;
}
case EQUALS:
case EQUALSIGNORECASE:
case ENDSWITH:
case CONTAINS: {
throw new IllegalArgumentException("Illegal StringMultipleComparison operator " + op);
}
case REGIONMATCHES:
case PATTERNMATCHES:
case APACHE_ORO_PATTERN_MATCHES: {
long longValue = e.getConcreteValue();
SmtExpr intConst = SmtExprBuilder.mkIntConstant(longValue);
return intConst;
}
default:
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
@Override
public SmtExpr visit(StringMultipleToIntegerExpression e, Void arg) {
Operator op = e.getOperator();
switch (op) {
case INDEXOFCI:
case INDEXOFSI: {
// over-approximate using INDEXOF
SmtExpr left = e.getLeftOperand().accept(this, null);
SmtExpr right = e.getRightOperand().accept(this, null);
SmtExpr indexOfExpr = SmtExprBuilder.mkIndexOf(left, right);
return indexOfExpr;
}
case LASTINDEXOFCI:
case LASTINDEXOFSI: {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
default: {
throw new UnsupportedOperationException("Not implemented yet! " + op);
}
}
}
@Override
public SmtExpr visit(StringUnaryToIntegerExpression e, Void arg) {
SmtExpr innerString = e.getOperand().accept(this, null);
if (innerString == null) {
return null;
}
if (!innerString.isSymbolic()) {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
Operator op = e.getOperator();
switch (op) {
case LENGTH: {
return SmtExprBuilder.mkLength(innerString);
}
case IS_INTEGER: {
long longValue = e.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
default:
throw new UnsupportedOperationException("Not implemented yet!");
}
}
@Override
public SmtExpr visit(RealToStringCast n, Void arg) {
String stringValue = n.getConcreteValue();
return mkStringConstant(stringValue);
}
@Override
public SmtExpr visit(StringToIntegerCast n, Void arg) {
long longValue = n.getConcreteValue();
return SmtExprBuilder.mkIntConstant(longValue);
}
@Override
public SmtExpr visit(NewTokenizerExpr n, Void arg) {
// TODO
throw new UnsupportedOperationException("Implement this method");
}
@Override
public SmtExpr visit(NextTokenizerExpr n, Void arg) {
// TODO
throw new IllegalStateException("NextTokenizerExpr is not implemented yet");
}
@Override
public SmtExpr visit(ReferenceConstant referenceConstant, Void arg) {
throw new UnsupportedOperationException("Translation to Z3-Str2 of ReferenceConstant is not yet implemented!");
}
@Override
public SmtExpr visit(ReferenceVariable r, Void arg) {
throw new UnsupportedOperationException("Translation to Z3-Str2 of ReferenceVariable is not yet implemented!");
}
@Override
public SmtExpr visit(GetFieldExpression r, Void arg) {
throw new UnsupportedOperationException("Translation to Z3-Str2 of GetFieldExpression is not yet implemented!");
}
}
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