Package it.unive.lisa.program.cfg.statement

Class NoOp

java.lang.Object

it.unive.lisa.program.cfg.statement.Statement

it.unive.lisa.program.cfg.statement.NoOp

All Implemented Interfaces:

ProgramPoint, CodeElement, CodeNode<CFG,Statement,Edge>, Node<CFG,Statement,Edge>, java.lang.Comparable<Statement>

public class NoOp
extends Statement

A statement that does nothing. Can be used for instrumenting branching operations.

Field Summary

Fields inherited from class it.unive.lisa.program.cfg.statement.Statement

offset

Constructor Summary

Constructors

Constructor	Description
NoOp(CFG cfg, CodeLocation location)	Builds the no-op, happening at the given location in the program.

Method Summary

Modifier and Type	Method	Description
<V> boolean	accept(GraphVisitor<CFG,Statement,Edge,V> visitor, V tool)	Accepts the given GraphVisitor.
boolean	equals(java.lang.Object obj)
int	hashCode()
<A extends AbstractState<A,H,V,T>,H extends HeapDomain<H>,V extends ValueDomain<V>,T extends TypeDomain<T>> AnalysisState<A,H,V,T>	semantics(AnalysisState<A,H,V,T> entryState, InterproceduralAnalysis<A,H,V,T> interprocedural, StatementStore<A,H,V,T> expressions)	Computes the semantics of the statement, expressing how semantic information is transformed by the execution of this statement.
int	setOffset(int offset)	Sets the offset of this node to the given value, and then proceeds by setting the one of its nested nodes (if any) to subsequent values.
java.lang.String	toString()

Methods inherited from class it.unive.lisa.program.cfg.statement.Statement

compareTo, getCFG, getEvaluationPredecessor, getLocation, getOffset, getStatementEvaluatedBefore, stopsExecution, throwsError

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unive.lisa.program.cfg.ProgramPoint

getProgram

Constructor Detail

NoOp

public NoOp(CFG cfg,
            CodeLocation location)

Builds the no-op, happening at the given location in the program.

Parameters:

cfg - the cfg that this statement belongs to

location - the location where this statement is defined within the program

Method Detail

setOffset

public int setOffset(int offset)

Description copied from interface: CodeNode

Sets the offset of this node to the given value, and then proceeds by setting the one of its nested nodes (if any) to subsequent values. The last offset used is returned.

Parameters:

offset - the offset to set

Returns:

the last offset used while setting the offsets of nested nodes

hashCode

public int hashCode()

Overrides:

hashCode in class Statement

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class Statement

toString

public final java.lang.String toString()

Specified by:

toString in class Statement

semantics

public <A extends AbstractState<A,H,V,T>,H extends HeapDomain<H>,V extends ValueDomain<V>,T extends TypeDomain<T>> AnalysisState<A,H,V,T> semantics(AnalysisState<A,H,V,T> entryState,
                                                                                                                                                                                                          InterproceduralAnalysis<A,H,V,T> interprocedural,
                                                                                                                                                                                                          StatementStore<A,H,V,T> expressions)
                                                                                                                                                                                                   throws SemanticException

Description copied from class: Statement

Computes the semantics of the statement, expressing how semantic information is transformed by the execution of this statement. This method is also responsible for recursively invoking the Statement.semantics(AnalysisState, InterproceduralAnalysis, StatementStore) of each nested Expression, saving the result of each call in expressions.

Specified by:

semantics in class Statement

Type Parameters:

A - the type of AbstractState

H - the type of the HeapDomain

V - the type of the ValueDomain

T - the type of TypeDomain

Parameters:

entryState - the entry state that represents the abstract values of each program variable and memory location when the execution reaches this statement

interprocedural - the interprocedural analysis of the program to analyze

expressions - the cache where analysis states of intermediate expressions must be stored

Returns:

the AnalysisState representing the abstract result of the execution of this statement

Throws:

SemanticException - if something goes wrong during the computation

accept

public <V> boolean accept(GraphVisitor<CFG,Statement,Edge,V> visitor,
                          V tool)

Description copied from interface: Node

Accepts the given GraphVisitor. Implementors of this method are responsible for invoking GraphVisitor.visit(Object, Graph, Node) on this node after Node.accept(GraphVisitor, Object) has been invoked on all nested nodes, if any. The visiting should stop at the first of such calls that return false.

Type Parameters:

V - the type of auxiliary tool that visitor can use

Parameters:

visitor - the visitor that is visiting the Graph containing this node

tool - the auxiliary tool that visitor can use

Returns:

whether or not the visiting should stop when this call returns, as decided by the visitor itself