net.sf.jode.expr
Class Operator

java.lang.Object
  net.sf.jode.expr.Expression
      net.sf.jode.expr.Operator

Direct Known Subclasses:

ArrayLengthOperator, ArrayLoadOperator, BinaryOperator, CheckCastOperator, CheckNullOperator, CompareBinaryOperator, CompareToIntOperator, CompareUnaryOperator, ConstantArrayOperator, ConvertOperator, FieldOperator, IfThenElseOperator, IIncOperator, InstanceOfOperator, InvokeOperator, LocalVarOperator, MonitorEnterOperator, MonitorExitOperator, NewArrayOperator, NoArgOperator, OuterLocalOperator, PopOperator, PrePostFixOperator, SimpleOperator, StoreInstruction, StringAddOperator, UnaryOperator

public abstract class Operator

extends Expression

Field Summary

static int	ADD_OP
static int	AND_OP
static int	ASSIGN_OP
static int	COMPARE_OP
static int	DEC_OP
static int	EQUALS_OP
static int	GREATER_OP
static int	GREATEREQ_OP
static int	INC_OP
static int	LESS_OP
static int	LESSEQ_OP
static int	LOG_AND_OP
static int	LOG_NOT_OP
static int	LOG_OR_OP
static int	NEG_OP
static int	NOTEQUALS_OP
static int	OPASSIGN_OP
protected int	operatorIndex
static int	SHIFT_OP
static int	SUB_OP

Fields inherited from class net.sf.jode.expr.Expression

EMPTYSTRING, type

Constructor Summary

Operator(Type type)

Operator(Type type, int op)

Method Summary

Expression	addOperand(Expression op)
int	canCombine(CombineableOperator combOp) Checks if the given Expression (which must be a CombineableOperator) can be combined into this expression.
Expression	combine(CombineableOperator comb) Combines the given Expression (which should be a StoreInstruction) into this expression.
boolean	containsConflictingLoad(MatchableOperator op) Checks if this expression contains a conflicting load, that matches the given CombineableOperator.
boolean	containsMatchingLoad(CombineableOperator comb) Checks if this expression contains a matching load, that matches the given Expression.
abstract void	dumpExpression(TabbedPrintWriter writer)
boolean	equals(java.lang.Object o)
void	fillDeclarables(java.util.Collection used)
void	fillInGenSet(java.util.Collection in, java.util.Collection gen)
int	getFreeOperandCount() Get the number of operands.
Operator	getOperator()
int	getOperatorIndex()
java.lang.String	getOperatorString()
Expression[]	getSubExpressions()
boolean	hasSideEffects(Expression expr) Checks if the value of the given expression can change, due to side effects in this expression.
void	initOperands(int opcount)
boolean	isConstant()
boolean	isFreeOperator() Tells if this is an operator, that doesn't have any subExpression, yet.
boolean	isFreeOperator(int opcount) Tells if this is an operator, that doesn't have any subExpression, yet, and that expects opcount operands
void	makeDeclaration(java.util.Set done)
boolean	opEquals(Operator o)
void	setOperatorIndex(int op)
void	setSubExpressions(int i, Expression expr)
Expression	simplify()
boolean	subsEquals(Operator other)

Methods inherited from class net.sf.jode.expr.Expression

dumpExpression, dumpExpression, getBreakPenalty, getParent, getPriority, getType, isVoid, makeInitializer, negate, removeOnetimeLocals, setType, simplifyString, simplifyStringBuffer, toString, updateParentType, updateSubTypes, updateType

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ADD_OP

public static final int ADD_OP

See Also:

Constant Field Values

SUB_OP

public static final int SUB_OP

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Constant Field Values

SHIFT_OP

public static final int SHIFT_OP

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Constant Field Values

AND_OP

public static final int AND_OP

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Constant Field Values

ASSIGN_OP

public static final int ASSIGN_OP

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Constant Field Values

OPASSIGN_OP

public static final int OPASSIGN_OP

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Constant Field Values

INC_OP

public static final int INC_OP

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Constant Field Values

DEC_OP

public static final int DEC_OP

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Constant Field Values

COMPARE_OP

public static final int COMPARE_OP

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Constant Field Values

EQUALS_OP

public static final int EQUALS_OP

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Constant Field Values

NOTEQUALS_OP

public static final int NOTEQUALS_OP

See Also:

Constant Field Values

LESS_OP

public static final int LESS_OP

See Also:

Constant Field Values

GREATEREQ_OP

public static final int GREATEREQ_OP

See Also:

Constant Field Values

GREATER_OP

public static final int GREATER_OP

See Also:

Constant Field Values

LESSEQ_OP

public static final int LESSEQ_OP

See Also:

Constant Field Values

LOG_AND_OP

public static final int LOG_AND_OP

See Also:

Constant Field Values

LOG_OR_OP

public static final int LOG_OR_OP

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Constant Field Values

LOG_NOT_OP

public static final int LOG_NOT_OP

See Also:

Constant Field Values

NEG_OP

public static final int NEG_OP

See Also:

Constant Field Values

operatorIndex

protected int operatorIndex

Constructor Detail

Operator

public Operator(Type type)

Operator

public Operator(Type type,
                int op)

Method Detail

initOperands

public void initOperands(int opcount)

getFreeOperandCount

public int getFreeOperandCount()

Description copied from class: Expression

Get the number of operands.

Specified by:

getFreeOperandCount in class Expression

Returns:

The number of stack entries this expression needs.

isFreeOperator

public boolean isFreeOperator()

Tells if this is an operator, that doesn't have any subExpression, yet.

isFreeOperator

public boolean isFreeOperator(int opcount)

Tells if this is an operator, that doesn't have any subExpression, yet, and that expects opcount operands

addOperand

public Expression addOperand(Expression op)

Specified by:

addOperand in class Expression

getOperator

public Operator getOperator()

getSubExpressions

public Expression[] getSubExpressions()

setSubExpressions

public void setSubExpressions(int i,
                              Expression expr)

getOperatorIndex

public int getOperatorIndex()

setOperatorIndex

public void setOperatorIndex(int op)

getOperatorString

public java.lang.String getOperatorString()

opEquals

public boolean opEquals(Operator o)

simplify

public Expression simplify()

Overrides:

simplify in class Expression

fillInGenSet

public void fillInGenSet(java.util.Collection in,
                         java.util.Collection gen)

Overrides:

fillInGenSet in class Expression

fillDeclarables

public void fillDeclarables(java.util.Collection used)

Overrides:

fillDeclarables in class Expression

makeDeclaration

public void makeDeclaration(java.util.Set done)

Overrides:

makeDeclaration in class Expression

hasSideEffects

public boolean hasSideEffects(Expression expr)

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.

Overrides:

hasSideEffects in class Expression

Parameters:

expr - the expression that should not change.

containsConflictingLoad

public boolean containsConflictingLoad(MatchableOperator op)

Checks if this expression contains a conflicting load, that matches the given CombineableOperator. The sub expressions are not checked.

Overrides:

containsConflictingLoad in class Expression

Parameters:

op - The combineable operator.

Returns:

if this expression contains a matching load.

containsMatchingLoad

public boolean containsMatchingLoad(CombineableOperator comb)

Checks if this expression contains a matching load, that matches the given Expression.

Overrides:

containsMatchingLoad in class Expression

Parameters:

comb - The store expression.

Returns:

true, iff this expression contains a matching load.

Throws:

ClassCastException, - if e.getOperator is not a CombineableOperator.

canCombine

public int canCombine(CombineableOperator combOp)

Checks if the given Expression (which must be a CombineableOperator) can be combined into this expression.

Overrides:

canCombine in class Expression

Returns:

1, if it can, 0, if no match was found and -1, if a conflict was found. You may wish to check for >0.

Throws:

ClassCastException, - if e.getOperator is not a CombineableOperator.

combine

public Expression combine(CombineableOperator comb)

Combines the given Expression (which should be a StoreInstruction) into this expression. You must only call this if canCombine returns the value 1.

Overrides:

combine in class Expression

Returns:

The combined expression.

Throws:

ClassCastException, - if e.getOperator is not a CombineableOperator.

subsEquals

public boolean subsEquals(Operator other)

equals

public boolean equals(java.lang.Object o)

isConstant

public boolean isConstant()

Overrides:

isConstant in class Expression

dumpExpression

public abstract void dumpExpression(TabbedPrintWriter writer)
                             throws java.io.IOException

Specified by:

dumpExpression in class Expression

Throws:

java.io.IOException