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

Class 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 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.

    • 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

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected int compareSameClassAndParams​(it.unive.lisa.program.cfg.statement.Statement o)  
      <A extends it.unive.lisa.analysis.AbstractState<A>>
      it.unive.lisa.analysis.AnalysisState<A>      		 fwdBinarySemantics​(it.unive.lisa.interprocedural.InterproceduralAnalysis<A> interprocedural, it.unive.lisa.analysis.AnalysisState<A> state, it.unive.lisa.symbolic.SymbolicExpression left, it.unive.lisa.symbolic.SymbolicExpression right, it.unive.lisa.analysis.StatementStore<A> expressions)  

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

        backwardSemanticsAux, bwdBinarySemantics, forwardSemanticsAux, getLeft, getRight

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

        accept, backwardSemantics, compareSameClass, equals, forwardSemantics, getConstructName, getOrder, getStatementEvaluatedAfter, getStatementEvaluatedBefore, getSubExpressions, hashCode, 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, getEvaluationSuccessor, getLocation, 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

      • compareSameClassAndParams

        protected int compareSameClassAndParams​(it.unive.lisa.program.cfg.statement.Statement o)
        Specified by:
        compareSameClassAndParams in class it.unive.lisa.program.cfg.statement.NaryExpression

      • fwdBinarySemantics

        public <A extends it.unive.lisa.analysis.AbstractState<A>> it.unive.lisa.analysis.AnalysisState<A> fwdBinarySemantics​(it.unive.lisa.interprocedural.InterproceduralAnalysis<A> interprocedural,
                                                                                                                      it.unive.lisa.analysis.AnalysisState<A> state,
                                                                                                                      it.unive.lisa.symbolic.SymbolicExpression left,
                                                                                                                      it.unive.lisa.symbolic.SymbolicExpression right,
                                                                                                                      it.unive.lisa.analysis.StatementStore<A> expressions)
                                                                                                               throws it.unive.lisa.analysis.SemanticException
        Specified by:
        fwdBinarySemantics in class it.unive.lisa.program.cfg.statement.BinaryExpression
        Throws:
        it.unive.lisa.analysis.SemanticException