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

Class UnaryStatement

java.lang.Object

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

it.unive.lisa.program.cfg.statement.NaryStatement

it.unive.lisa.program.cfg.statement.UnaryStatement

All Implemented Interfaces:

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

Direct Known Subclasses:

Return, Throw

public abstract class UnaryStatement
extends NaryStatement

An NaryStatement with a single sub-expression.

Field Summary

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

offset

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	UnaryStatement(CFG cfg, CodeLocation location, java.lang.String constructName, EvaluationOrder order, Expression subExpression)	Builds the statement, happening at the given location in the program.
protected	UnaryStatement(CFG cfg, CodeLocation location, java.lang.String constructName, Expression subExpression)	Builds the statement, happening at the given location in the program.

Method Summary

Modifier and Type	Method	Description
<A extends AbstractState<A>> AnalysisState<A>	backwardSemanticsAux(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, ExpressionSet[] params, StatementStore<A> expressions)	Computes the backward semantics of the statement, after the semantics of all sub-expressions have been computed.
<A extends AbstractState<A>> AnalysisState<A>	bwdUnarySemantics(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, SymbolicExpression expr, StatementStore<A> expressions)	Computes the backward semantics of the statement, after the semantics of the sub-expression has been computed.
<A extends AbstractState<A>> AnalysisState<A>	forwardSemanticsAux(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, ExpressionSet[] params, StatementStore<A> expressions)	Computes the forward semantics of the statement, after the semantics of all sub-expressions have been computed.
abstract <A extends AbstractState<A>> AnalysisState<A>	fwdUnarySemantics(InterproceduralAnalysis<A> interprocedural, AnalysisState<A> state, SymbolicExpression expr, StatementStore<A> expressions)	Computes the forward semantics of the statement, after the semantics of the sub-expression has been computed.
Expression	getSubExpression()	Yields the only sub-expression of this unary statement.

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

accept, backwardSemantics, equals, forwardSemantics, getConstructName, getOrder, getStatementEvaluatedAfter, getStatementEvaluatedBefore, getSubExpressions, hashCode, setOffset, toString

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

compareTo, getCFG, getEvaluationPredecessor, getEvaluationSuccessor, getLocation, getOffset, 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

UnaryStatement

protected UnaryStatement(CFG cfg,
                         CodeLocation location,
                         java.lang.String constructName,
                         Expression subExpression)

Builds the statement, happening at the given location in the program. The EvaluationOrder is LeftToRightEvaluation.

Parameters:

cfg - the cfg that this statement belongs to

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

constructName - the name of the construct represented by this statement

subExpression - the sub-expression of this statement

UnaryStatement

protected UnaryStatement(CFG cfg,
                         CodeLocation location,
                         java.lang.String constructName,
                         EvaluationOrder order,
                         Expression subExpression)

Builds the statement, happening at the given location in the program.

Parameters:

cfg - the cfg that this statement belongs to

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

constructName - the name of the construct represented by this statement

order - the evaluation order of the sub-expressions

subExpression - the sub-expression of this statement

Method Detail

getSubExpression

public Expression getSubExpression()

Yields the only sub-expression of this unary statement.

Returns:

the only sub-expression

forwardSemanticsAux

public <A extends AbstractState<A>> AnalysisState<A> forwardSemanticsAux(InterproceduralAnalysis<A> interprocedural,
                                                                         AnalysisState<A> state,
                                                                         ExpressionSet[] params,
                                                                         StatementStore<A> expressions)
                                                                  throws SemanticException

Description copied from class: NaryStatement

Computes the forward semantics of the statement, after the semantics of all sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this call returns.

Specified by:

forwardSemanticsAux in class NaryStatement

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the statement is to be evaluated

params - the symbolic expressions representing the computed values of the sub-expressions of this statement

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

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

Throws:

SemanticException - if something goes wrong during the computation

fwdUnarySemantics

public abstract <A extends AbstractState<A>> AnalysisState<A> fwdUnarySemantics(InterproceduralAnalysis<A> interprocedural,
                                                                                AnalysisState<A> state,
                                                                                SymbolicExpression expr,
                                                                                StatementStore<A> expressions)
                                                                         throws SemanticException

Computes the forward semantics of the statement, after the semantics of the sub-expression has been computed. Meta variables from the sub-expression will be forgotten after this statement returns.

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the statement is to be evaluated

expr - the symbolic expressions representing the computed value of the sub-expression of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

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

Throws:

SemanticException - if something goes wrong during the computation

backwardSemanticsAux

public <A extends AbstractState<A>> AnalysisState<A> backwardSemanticsAux(InterproceduralAnalysis<A> interprocedural,
                                                                          AnalysisState<A> state,
                                                                          ExpressionSet[] params,
                                                                          StatementStore<A> expressions)
                                                                   throws SemanticException

Description copied from class: NaryStatement

Computes the backward semantics of the statement, after the semantics of all sub-expressions have been computed. Meta variables from the sub-expressions will be forgotten after this call returns. By default, this method delegates to NaryStatement.forwardSemanticsAux(InterproceduralAnalysis, AnalysisState, ExpressionSet[], StatementStore), as it is fine for most atomic statements. One should redefine this method if a statement's semantics is composed of a series of smaller operations.

Overrides:

backwardSemanticsAux in class NaryStatement

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the statement is to be evaluated

params - the symbolic expressions representing the computed values of the sub-expressions of this statement

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

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

Throws:

SemanticException - if something goes wrong during the computation

bwdUnarySemantics

public <A extends AbstractState<A>> AnalysisState<A> bwdUnarySemantics(InterproceduralAnalysis<A> interprocedural,
                                                                       AnalysisState<A> state,
                                                                       SymbolicExpression expr,
                                                                       StatementStore<A> expressions)
                                                                throws SemanticException

Computes the backward semantics of the statement, after the semantics of the sub-expression has been computed. Meta variables from the sub-expression will be forgotten after this statement returns. By default, this method delegates to fwdUnarySemantics(InterproceduralAnalysis, AnalysisState, SymbolicExpression, StatementStore), as it is fine for most atomic statements. One should redefine this method if a statement's semantics is composed of a series of smaller operations.

Type Parameters:

A - the type of AbstractState

Parameters:

interprocedural - the interprocedural analysis of the program to analyze

state - the state where the statement is to be evaluated

expr - the symbolic expressions representing the computed value of the sub-expression of this expression

expressions - the cache where analysis states of intermediate expressions are stored and that can be accessed to query for post-states of parameters expressions

Returns:

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

Throws:

SemanticException - if something goes wrong during the computation