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

Class NullLiteral

java.lang.Object

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

it.unive.lisa.program.cfg.statement.Expression

it.unive.lisa.program.cfg.statement.Literal

it.unive.lisa.program.cfg.statement.NullLiteral

All Implemented Interfaces:

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

public class NullLiteral
extends Literal

A literal representing the null constant.

Field Summary

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

offset

Constructor Summary

Constructors

Constructor	Description
NullLiteral(CFG cfg, CodeLocation location)	Builds the null literal, happening at the given location in the program.

Method Summary

Modifier and Type	Method	Description
<A extends AbstractState<A,H,V>,H extends HeapDomain<H>,V extends ValueDomain<V>> AnalysisState<A,H,V>	semantics(AnalysisState<A,H,V> entryState, InterproceduralAnalysis<A,H,V> interprocedural, StatementStore<A,H,V> expressions)	Computes the semantics of the statement, expressing how semantic information is transformed by the execution of this statement.
java.lang.String	toString()

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

accept, equals, getValue, hashCode, setOffset

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

getDynamicType, getMetaVariables, getParentStatement, getRootStatement, getRuntimeTypes, getStaticType, setParentStatement, setRuntimeTypes

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

compareTo, getCFG, getLocation, getOffset, stopsExecution, throwsError

Methods inherited from class java.lang.Object

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

Constructor Detail

NullLiteral

public NullLiteral(CFG cfg,
                   CodeLocation location)

Builds the null literal, happening at the given location in the program. The type of a null literal is NullType.

Parameters:

cfg - the cfg that this expression belongs to

location - the location where the expression is defined within the source file. If unknown, use null

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class Literal

semantics

public <A extends AbstractState<A,H,V>,H extends HeapDomain<H>,V extends ValueDomain<V>> AnalysisState<A,H,V> semantics(AnalysisState<A,H,V> entryState,
                                                                                                                                                            InterproceduralAnalysis<A,H,V> interprocedural,
                                                                                                                                                            StatementStore<A,H,V> 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.

Overrides:

semantics in class Literal

Type Parameters:

A - the type of AbstractState

H - the type of the HeapDomain

V - the type of the ValueDomain

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