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

Class Equals

java.lang.Object

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

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

it.unive.lisa.program.cfg.statement.NaryExpression

it.unive.lisa.program.cfg.statement.BinaryExpression

it.unive.lisa.program.cfg.statement.string.Equals

All Implemented Interfaces:

it.unive.lisa.program.cfg.ProgramPoint, it.unive.lisa.program.CodeElement, it.unive.lisa.util.datastructures.graph.code.CodeNode<it.unive.lisa.program.cfg.CFG,it.unive.lisa.program.cfg.statement.Statement,it.unive.lisa.program.cfg.edge.Edge>, it.unive.lisa.util.datastructures.graph.Node<it.unive.lisa.program.cfg.CFG,it.unive.lisa.program.cfg.statement.Statement,it.unive.lisa.program.cfg.edge.Edge>, java.lang.Comparable<it.unive.lisa.program.cfg.statement.Statement>

public class Equals
extends it.unive.lisa.program.cfg.statement.BinaryExpression

An expression modeling the string equals operation. The type of both operands must be StringType. The type of this expression is the BooleanType.

Since in most languages string operations are provided through calls to library functions, this class contains a field originating whose purpose is to optionally store a Statement that is rewritten to an instance of this class (i.e., a call to a NativeCFG modeling the library function). If present, such statement will be used as ProgramPoint for semantics computations. This allows subclasses to implement PluggableStatement easily without redefining the semantics provided by this class.

Field Summary

Fields

Modifier and Type	Field	Description
protected it.unive.lisa.program.cfg.statement.Statement	originating	Statement that has been rewritten to this operation, if any.

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

offset

Constructor Summary

Constructors

Constructor	Description
Equals(it.unive.lisa.program.cfg.CFG cfg, it.unive.lisa.program.cfg.CodeLocation location, it.unive.lisa.program.cfg.statement.Expression left, it.unive.lisa.program.cfg.statement.Expression right)	Builds the equals.

Method Summary

Modifier and Type	Method	Description
<A extends it.unive.lisa.analysis.AbstractState<A,H,V,T>,H extends it.unive.lisa.analysis.heap.HeapDomain<H>,V extends it.unive.lisa.analysis.value.ValueDomain<V>,T extends it.unive.lisa.analysis.value.TypeDomain<T>> it.unive.lisa.analysis.AnalysisState<A,H,V,T>	binarySemantics(it.unive.lisa.interprocedural.InterproceduralAnalysis<A,H,V,T> interprocedural, it.unive.lisa.analysis.AnalysisState<A,H,V,T> state, it.unive.lisa.symbolic.SymbolicExpression left, it.unive.lisa.symbolic.SymbolicExpression right, it.unive.lisa.analysis.StatementStore<A,H,V,T> expressions)

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

expressionSemantics, getLeft, getRight

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

accept, equals, getConstructName, getOrder, getStatementEvaluatedBefore, getSubExpressions, hashCode, semantics, setOffset, toString

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

getMetaVariables, getParentStatement, getRootStatement, getStaticType, setParentStatement

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

compareTo, getCFG, getEvaluationPredecessor, 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

Field Detail

originating

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

Statement that has been rewritten to this operation, if any. This is to accomodate the fact that, in most languages, string operations are performed through calls, and one might want to provide the semantics of those calls through NativeCFG that rewrites to instances of this class.

Constructor Detail

Equals

public Equals(it.unive.lisa.program.cfg.CFG cfg,
              it.unive.lisa.program.cfg.CodeLocation location,
              it.unive.lisa.program.cfg.statement.Expression left,
              it.unive.lisa.program.cfg.statement.Expression right)

Builds the equals.

Parameters:

cfg - the CFG where this operation lies

location - the code location where this operation is defined

left - the left-hand side of this operation

right - the right-hand side of this operation

Method Detail

binarySemantics

public <A extends it.unive.lisa.analysis.AbstractState<A,H,V,T>,H extends it.unive.lisa.analysis.heap.HeapDomain<H>,V extends it.unive.lisa.analysis.value.ValueDomain<V>,T extends it.unive.lisa.analysis.value.TypeDomain<T>> it.unive.lisa.analysis.AnalysisState<A,H,V,T> binarySemantics(it.unive.lisa.interprocedural.InterproceduralAnalysis<A,H,V,T> interprocedural,
                                                                                                                                                                                                                                                                                                                                                    it.unive.lisa.analysis.AnalysisState<A,H,V,T> state,
                                                                                                                                                                                                                                                                                                                                                    it.unive.lisa.symbolic.SymbolicExpression left,
                                                                                                                                                                                                                                                                                                                                                    it.unive.lisa.symbolic.SymbolicExpression right,
                                                                                                                                                                                                                                                                                                                                                    it.unive.lisa.analysis.StatementStore<A,H,V,T> expressions)
                                                                                                                                                                                                                                                                                                                                             throws it.unive.lisa.analysis.SemanticException

Specified by:

binarySemantics in class it.unive.lisa.program.cfg.statement.BinaryExpression

Throws:

it.unive.lisa.analysis.SemanticException