You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
311 lines
12 KiB
311 lines
12 KiB
/*
|
|
* Expression (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;
|
|
import sun.tools.java.Type;
|
|
import sun.tools.java.Constants;
|
|
import sun.tools.java.FieldDefinition;
|
|
|
|
public class Expression extends Instruction {
|
|
Operator operator;
|
|
Expression[] subExpressions;
|
|
Expression parent = null;
|
|
|
|
public Expression(Operator op, Expression[] sub) {
|
|
super(MyType.tUnknown);
|
|
operator = op;
|
|
subExpressions = sub;
|
|
operator.setExpression(this);
|
|
if (subExpressions.length != op.getOperandCount())
|
|
throw new AssertError ("Operand count mismatch: "+
|
|
subExpressions.length + " != " +
|
|
op.getOperandCount());
|
|
if (subExpressions.length > 0) {
|
|
Type types[] = new Type[subExpressions.length];
|
|
for (int i=0; i < types.length; i++) {
|
|
subExpressions[i].parent = this;
|
|
types[i] = subExpressions[i].getType();
|
|
}
|
|
operator.setOperandType(types);
|
|
updateSubTypes();
|
|
}
|
|
this.type = operator.getType();
|
|
}
|
|
|
|
public Expression negate() {
|
|
if (operator.operator >= operator.COMPARE_OP &&
|
|
operator.operator < operator.COMPARE_OP+6) {
|
|
operator.setOperator(operator.getOperator() ^ 1);
|
|
return this;
|
|
} else if (operator.operator == operator.LOG_AND_OP ||
|
|
operator.operator == operator.LOG_OR_OP) {
|
|
operator.setOperator(operator.getOperator() ^ 1);
|
|
for (int i=0; i< subExpressions.length; i++) {
|
|
subExpressions[i] = subExpressions[i].negate();
|
|
}
|
|
return this;
|
|
} else if (operator.operator == operator.LOG_NOT_OP) {
|
|
return subExpressions[0];
|
|
}
|
|
|
|
Operator negop =
|
|
new UnaryOperator(Type.tBoolean, Operator.LOG_NOT_OP);
|
|
Expression[] e = { this };
|
|
return new Expression(negop, e);
|
|
}
|
|
|
|
public Expression tryToCombine(Expression e) {
|
|
if (e.operator instanceof StoreInstruction) {
|
|
StoreInstruction store = (StoreInstruction) e.operator;
|
|
Expression search = this;
|
|
while (true) {
|
|
if (store.matches(search.operator)) {
|
|
int i;
|
|
for (i=0; i < e.subExpressions.length-1; i++) {
|
|
if (!e.subExpressions[i].equals
|
|
(search.subExpressions[i]))
|
|
break;
|
|
}
|
|
if (i == e.subExpressions.length-1) {
|
|
search.operator =
|
|
new AssignOperator(store.getOperator(), store);
|
|
search.subExpressions = e.subExpressions;
|
|
return this;
|
|
}
|
|
}
|
|
if (search.subExpressions.length == 0)
|
|
break;
|
|
if (search.getOperator() instanceof AssignOperator)
|
|
search = search.subExpressions[subExpressions.length-1];
|
|
else if (search.getOperator() instanceof StringAddOperator &&
|
|
search.subExpressions[1] == emptyString)
|
|
search = search.subExpressions[1];
|
|
else
|
|
search = search.subExpressions[0];
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public Operator getOperator() {
|
|
return operator;
|
|
}
|
|
|
|
public Expression[] getSubExpressions() {
|
|
return subExpressions;
|
|
}
|
|
|
|
public void updateSubTypes() {
|
|
for (int i=0; i < subExpressions.length; i++) {
|
|
subExpressions[i].setType(operator.getOperandType(i));
|
|
}
|
|
}
|
|
|
|
public void setType(Type newType) {
|
|
newType = MyType.intersection(type, newType);
|
|
if (newType != type) {
|
|
type = newType;
|
|
operator.setType(type);
|
|
}
|
|
}
|
|
|
|
public boolean isVoid() {
|
|
return operator.getType() == Type.tVoid;
|
|
}
|
|
|
|
String toString(int minPriority) {
|
|
String[] expr = new String[subExpressions.length];
|
|
for (int i=0; i<subExpressions.length; i++) {
|
|
expr[i] = subExpressions[i].
|
|
toString(operator.getOperandPriority(i));
|
|
}
|
|
String result = operator.toString(expr);
|
|
if (operator.getPriority() < minPriority) {
|
|
result = "("+result+")";
|
|
}
|
|
if (operator.getType() == MyType.tError)
|
|
result = "(/*type error */" + result+")";
|
|
return result;
|
|
}
|
|
|
|
public boolean equals(Object o) {
|
|
if (this == o)
|
|
return true;
|
|
if (!(o instanceof Expression))
|
|
return false;
|
|
Expression expr = (Expression) o;
|
|
if (!operator.equals(expr.operator) ||
|
|
subExpressions.length != expr.subExpressions.length)
|
|
return false;
|
|
|
|
for (int i=0; i<subExpressions.length; i++) {
|
|
if (!subExpressions[i].equals(expr.subExpressions[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public String toString() {
|
|
return toString(0);
|
|
}
|
|
|
|
static Expression emptyString =
|
|
new Expression(new EmptyStringOperator(), new Expression[0]);
|
|
|
|
Expression simplifyStringBuffer() {
|
|
FieldDefinition field;
|
|
if (operator instanceof InvokeOperator &&
|
|
(field = ((InvokeOperator)operator).getField())
|
|
.getClassDefinition().getName() ==
|
|
Constants.idJavaLangStringBuffer &&
|
|
!((InvokeOperator)operator).isStatic() &&
|
|
field.getName() == Constants.idAppend &&
|
|
field.getType().getArgumentTypes().length == 1) {
|
|
|
|
Expression e = subExpressions[0].simplifyStringBuffer();
|
|
if (e == null)
|
|
return null;
|
|
|
|
if (e.operator instanceof EmptyStringOperator &&
|
|
MyType.isOfType(subExpressions[1].getType(), Type.tString))
|
|
return subExpressions[1];
|
|
|
|
Expression[] exprs = { e,
|
|
(Expression)subExpressions[1].simplify() };
|
|
return new Expression(new StringAddOperator(), exprs);
|
|
}
|
|
if (operator instanceof ConstructorOperator &&
|
|
MyType.isOfType(operator.getType(), MyType.tStringBuffer)) {
|
|
if (operator.getOperandCount() == 1)
|
|
return emptyString;
|
|
else if (operator.getOperandCount() == 2 &&
|
|
MyType.isOfType(subExpressions[1].getType(),
|
|
MyType.tString))
|
|
return (Expression) subExpressions[1].simplify();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public Instruction simplify() {
|
|
if (operator instanceof IfThenElseOperator &&
|
|
operator.getType() == Type.tBoolean) {
|
|
if (subExpressions[1].operator instanceof ConstOperator &&
|
|
subExpressions[2].operator instanceof ConstOperator) {
|
|
ConstOperator c1 = (ConstOperator) subExpressions[1].operator;
|
|
ConstOperator c2 = (ConstOperator) subExpressions[2].operator;
|
|
if (c1.getValue().equals("true") &&
|
|
c2.getValue().equals("false"))
|
|
return subExpressions[0].simplify();
|
|
if (c2.getValue().equals("true") &&
|
|
c1.getValue().equals("false"))
|
|
return subExpressions[0].negate().simplify();
|
|
}
|
|
}
|
|
// if ((operator instanceof AssignOperator ||
|
|
// operator instanceof StoreInstruction) &&
|
|
// subExpressions[subExpressions.length-1]
|
|
// .operator instanceof ConstOperator) {
|
|
// StoreInstruction store;
|
|
// if (operator instanceof AssignOperator)
|
|
// store = ((AssignOperator)operator).getStore();
|
|
// else
|
|
// store = (StoreInstruction)operator;
|
|
|
|
// ConstOperator one = (ConstOperator)
|
|
// subExpressions[subExpressions.length-1].operator;
|
|
|
|
// if ((operator.getOperator() ==
|
|
// operator.OPASSIGN_OP+operator.ADD_OP ||
|
|
// operator.getOperator() ==
|
|
// operator.OPASSIGN_OP+operator.NEG_OP) &&
|
|
// (one.getValue().equals("1") ||
|
|
// one.getValue().equals("-1"))) {
|
|
|
|
// int op = ((operator.getOperator() ==
|
|
// operator.OPASSIGN_OP+operator.ADD_OP) ==
|
|
// one.getValue().equals("1"))?
|
|
// operator.INC_OP : operator.DEC_OP;
|
|
|
|
// return new Expression
|
|
// (new PostFixOperator
|
|
// (store.getType(), op, store,
|
|
// operator instanceof StoreInstruction),
|
|
// new Expression[0]).simplify();
|
|
// }
|
|
// }
|
|
if (operator instanceof CompareUnaryOperator &&
|
|
subExpressions[0].operator instanceof CompareToIntOperator) {
|
|
CompareBinaryOperator newOp = new CompareBinaryOperator
|
|
(subExpressions[0].operator.getOperandType(0),
|
|
operator.getOperator());
|
|
return new Expression(newOp, subExpressions[0].subExpressions).
|
|
simplify();
|
|
}
|
|
if (operator instanceof CompareUnaryOperator &&
|
|
operator.getOperandType(0) != Type.tBoolean) {
|
|
if (subExpressions[0].operator instanceof ConstOperator) {
|
|
ConstOperator c = (ConstOperator) subExpressions[0].operator;
|
|
if (c.getValue().equals("0") || c.getValue().equals("1")) {
|
|
Type[] newType = {Type.tBoolean};
|
|
operator.setOperandType(newType);
|
|
}
|
|
}
|
|
}
|
|
if (operator instanceof CompareUnaryOperator &&
|
|
operator.getOperandType(0) == Type.tBoolean) {
|
|
if (operator.getOperator() == 26) /* xx == false */
|
|
return subExpressions[0].negate().simplify();
|
|
if (operator.getOperator() == 27) /* xx != false */
|
|
return subExpressions[0].simplify();
|
|
}
|
|
|
|
if (operator instanceof InvokeOperator &&
|
|
((InvokeOperator)operator).getField().
|
|
getName() == Constants.idToString &&
|
|
!((InvokeOperator)operator).isStatic() &&
|
|
((InvokeOperator)operator).getField().
|
|
getClassDefinition().getType() == MyType.tStringBuffer &&
|
|
operator.getOperandCount() == 1) {
|
|
Instruction simple = subExpressions[0].simplifyStringBuffer();
|
|
if (simple != null)
|
|
return simple;
|
|
}
|
|
if (operator instanceof InvokeOperator &&
|
|
((InvokeOperator)operator).getField().
|
|
getName() == Constants.idValueOf &&
|
|
((InvokeOperator)operator).isStatic() &&
|
|
((InvokeOperator)operator).getField().
|
|
getClassDefinition().getType() == MyType.tString &&
|
|
operator.getOperandCount() == 1) {
|
|
if (subExpressions[0].getType() == MyType.tString)
|
|
return subExpressions[0].simplify();
|
|
else {
|
|
Expression[] exprs = {
|
|
emptyString,
|
|
(Expression) subExpressions[0].simplify()
|
|
};
|
|
return new Expression(new StringAddOperator(), exprs);
|
|
}
|
|
}
|
|
for (int i=0; i< subExpressions.length; i++)
|
|
subExpressions[i] = (Expression) subExpressions[i].simplify();
|
|
|
|
return this;
|
|
}
|
|
}
|
|
|