Predicate nullGuard

Gets a Guard that tests (possibly indirectly) whether a given SSA variable is null or not.

If result evaluates to branch, then v is guaranteed to be null if isnull is true, and non-null if isnull is false.

Import path


                                import semmle.code.java.dataflow.NullGuards


                            
                                
                                    Guard
                                
                                 
                            
                            
                                nullGuard
                            
                            
                                (
                                
                                    
                                        SsaVariable
                                    
                                     
                                    v
                                
                                , 
                                
                                    
                                        boolean
                                    
                                     
                                    branch
                                
                                , 
                                
                                    
                                        boolean
                                    
                                     
                                    isnull
                                
                                )