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.
317 lines
8.7 KiB
317 lines
8.7 KiB
/* Expression Copyright (C) 1998-1999 Jochen Hoenicke.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
package jode.expr;
|
|
import jode.type.Type;
|
|
import jode.GlobalOptions;
|
|
import jode.decompiler.TabbedPrintWriter;
|
|
|
|
import @COLLECTIONS@.Collection;
|
|
import @COLLECTIONS@.Set;
|
|
|
|
public abstract class Expression {
|
|
protected Type type;
|
|
|
|
Operator parent = null;
|
|
|
|
public Expression(Type type) {
|
|
this.type = type;
|
|
}
|
|
|
|
public void setType(Type otherType) {
|
|
Type newType = otherType.intersection(type);
|
|
if (type.equals(newType))
|
|
return;
|
|
if (newType == Type.tError && otherType != Type.tError) {
|
|
GlobalOptions.err.println("setType: Type error in "+this
|
|
+": merging "+type+" and "+otherType);
|
|
if (parent != null)
|
|
GlobalOptions.err.println("\tparent is "+parent);
|
|
if ((GlobalOptions.debuggingFlags
|
|
& GlobalOptions.DEBUG_TYPES) != 0)
|
|
Thread.dumpStack();
|
|
}
|
|
type = newType;
|
|
if (type != Type.tError)
|
|
updateSubTypes();
|
|
}
|
|
|
|
public void updateParentType(Type otherType) {
|
|
setType(otherType);
|
|
if (parent != null)
|
|
parent.updateType();
|
|
}
|
|
|
|
/**
|
|
* Tells an expression that an inner expression may have changed and
|
|
* that the type should be recalculated.
|
|
*
|
|
* This may call setType of the caller again.
|
|
*/
|
|
public abstract void updateType();
|
|
|
|
/**
|
|
* Tells an expression that an outer expression has changed our type
|
|
* and that the inner types should be recalculated.
|
|
*/
|
|
public abstract void updateSubTypes();
|
|
|
|
public Type getType() {
|
|
return type;
|
|
}
|
|
|
|
public Operator getParent() {
|
|
return parent;
|
|
}
|
|
|
|
/**
|
|
* Get priority of the operator.
|
|
* Currently this priorities are known:
|
|
* <ul><li> 1000 constant
|
|
* </li><li> 950 new, .(field access), []
|
|
* </li><li> 900 new[]
|
|
* </li><li> 800 ++,-- (post)
|
|
* </li><li> 700 ++,--(pre), +,-(unary), ~, !, cast
|
|
* </li><li> 650 *,/, %
|
|
* </li><li> 610 +,-
|
|
* </li><li> 600 <<, >>, >>>
|
|
* </li><li> 550 >, <, >=, <=, instanceof
|
|
* </li><li> 500 ==, !=
|
|
* </li><li> 450 &
|
|
* </li><li> 420 ^
|
|
* </li><li> 410 |
|
|
* </li><li> 350 &&
|
|
* </li><li> 310 ||
|
|
* </li><li> 200 ?:
|
|
* </li><li> 100 =, +=, -=, etc.
|
|
* </li></ul>
|
|
*/
|
|
public abstract int getPriority();
|
|
|
|
/**
|
|
* Get the penalty for splitting up this operator.
|
|
*/
|
|
public int getBreakPenalty() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Get the number of operands.
|
|
* @return The number of stack entries this expression needs.
|
|
*/
|
|
public abstract int getFreeOperandCount();
|
|
|
|
public abstract Expression addOperand(Expression op);
|
|
|
|
public Expression negate() {
|
|
Operator negop =
|
|
new UnaryOperator(Type.tBoolean, Operator.LOG_NOT_OP);
|
|
negop.addOperand(this);
|
|
return negop;
|
|
}
|
|
|
|
/**
|
|
* Checks if the value of the given expression can change, due to
|
|
* side effects in this expression. If this returns false, the
|
|
* expression can safely be moved behind the current expresion.
|
|
* @param expr the expression that should not change.
|
|
*/
|
|
public boolean hasSideEffects(Expression expr) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given Expression (which should be a CombineableOperator)
|
|
* can be combined into this expression.
|
|
* @param e The store expression, must be of type void.
|
|
* @return 1, if it can, 0, if no match was found and -1, if a
|
|
* conflict was found. You may wish to check for >0.
|
|
*/
|
|
public int canCombine(CombineableOperator combOp) {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Checks if this expression contains a load, that matches the
|
|
* given CombineableOperator (which must be an Operator)
|
|
* @param e The store expression.
|
|
* @return if this expression contains a matching load.
|
|
* @exception ClassCastException, if e.getOperator
|
|
* is not a CombineableOperator.
|
|
*/
|
|
public boolean containsMatchingLoad(CombineableOperator e) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks if this expression contains a conflicting load, that
|
|
* matches the given CombineableOperator. The sub expressions are
|
|
* not checked.
|
|
* @param op The combineable operator.
|
|
* @return if this expression contains a matching load. */
|
|
public boolean containsConflictingLoad(MatchableOperator op) {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Combines the given Expression (which should be a StoreInstruction)
|
|
* into this expression. You must only call this if
|
|
* canCombine returns the value 1.
|
|
* @param e The store expression,
|
|
* the operator must be a CombineableOperator.
|
|
* @return The combined expression.
|
|
* @exception ClassCastException, if e.getOperator
|
|
* is not a CombineableOperator.
|
|
*/
|
|
public Expression combine(CombineableOperator comb) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* This method should remove local variables that are only written
|
|
* and read one time directly after another. <br>
|
|
*
|
|
* In this case this is a non void LocalStoreOperator, whose local
|
|
* isn't used in other places.
|
|
* @return an expression where the locals are removed.
|
|
*/
|
|
public Expression removeOnetimeLocals() {
|
|
return this;
|
|
}
|
|
|
|
public Expression simplify() {
|
|
return this;
|
|
}
|
|
public Expression simplifyString() {
|
|
return this;
|
|
}
|
|
|
|
public static Expression EMPTYSTRING = new ConstOperator("");
|
|
|
|
public Expression simplifyStringBuffer() {
|
|
return null;
|
|
}
|
|
|
|
public void makeInitializer(Type type) {
|
|
}
|
|
|
|
public boolean isConstant() {
|
|
return true;
|
|
}
|
|
|
|
public void fillInGenSet(Collection in, Collection gen) {
|
|
}
|
|
|
|
public void fillDeclarables(Collection used) {
|
|
}
|
|
|
|
public void makeDeclaration(Set done) {
|
|
}
|
|
|
|
public abstract void dumpExpression(TabbedPrintWriter writer)
|
|
throws java.io.IOException;
|
|
|
|
public void dumpExpression(int options, TabbedPrintWriter writer)
|
|
throws java.io.IOException
|
|
{
|
|
writer.startOp(options, getBreakPenalty());
|
|
dumpExpression(writer);
|
|
writer.endOp();
|
|
}
|
|
|
|
public void dumpExpression(TabbedPrintWriter writer, int minPriority)
|
|
throws java.io.IOException {
|
|
int options;
|
|
boolean needParen1 = false, needParen2 = false;
|
|
boolean needEndOp1 = false, needEndOp2 = false;
|
|
|
|
String typecast = "";
|
|
|
|
if (type == Type.tError)
|
|
typecast = "/*TYPE_ERROR*/";
|
|
else if ((GlobalOptions.debuggingFlags
|
|
& GlobalOptions.DEBUG_TYPES) != 0)
|
|
typecast = "(TYPE "+type+")";
|
|
|
|
if (typecast != "") {
|
|
if (minPriority > 700) {
|
|
needParen1 = true;
|
|
needEndOp1 = true;
|
|
writer.print("(");
|
|
writer.startOp(writer.EXPL_PAREN, 0);
|
|
} else if (minPriority < 700) {
|
|
needEndOp1 = true;
|
|
writer.startOp(writer.IMPL_PAREN, 1);
|
|
}
|
|
writer.print(typecast);
|
|
writer.breakOp();
|
|
writer.print(" ");
|
|
minPriority = 700;
|
|
}
|
|
|
|
int priority = getPriority();
|
|
if (priority < minPriority) {
|
|
needParen2 = true;
|
|
needEndOp2 = true;
|
|
writer.print("(");
|
|
writer.startOp(writer.EXPL_PAREN, getBreakPenalty());
|
|
} else if (priority != minPriority) {
|
|
needEndOp2 = true;
|
|
if (getType() == Type.tVoid)
|
|
writer.startOp(writer.NO_PAREN, getBreakPenalty());
|
|
else
|
|
writer.startOp(writer.IMPL_PAREN, 1 + getBreakPenalty());
|
|
}
|
|
|
|
try {
|
|
dumpExpression(writer);
|
|
} catch (RuntimeException ex) {
|
|
writer.print("(RUNTIME ERROR IN EXPRESSION)");
|
|
ex.printStackTrace(GlobalOptions.err);
|
|
}
|
|
|
|
if (needEndOp2) {
|
|
writer.endOp();
|
|
if (needParen2)
|
|
writer.print(")");
|
|
}
|
|
if (needEndOp1) {
|
|
writer.endOp();
|
|
if (needParen1)
|
|
writer.print(")");
|
|
}
|
|
}
|
|
|
|
public String toString() {
|
|
try {
|
|
java.io.StringWriter strw = new java.io.StringWriter();
|
|
TabbedPrintWriter writer = new TabbedPrintWriter(strw);
|
|
dumpExpression(writer);
|
|
return strw.toString();
|
|
} catch (java.io.IOException ex) {
|
|
return "/*IOException*/"+super.toString();
|
|
} catch (RuntimeException ex) {
|
|
return "/*RuntimeException*/"+super.toString();
|
|
}
|
|
}
|
|
|
|
public boolean isVoid() {
|
|
return getType() == Type.tVoid;
|
|
}
|
|
}
|
|
|