Class Guard

A condition that can be evaluated to either true or false. This can either be an Expr of boolean type that isn’t a boolean literal, or a case of a switch statement, or a method access that acts as a precondition check.

Evaluating a switch case to true corresponds to taking that switch case, and evaluating it to false corresponds to taking some other branch.

Import path


                                import semmle.code.java.controlflow.Guards

Direct supertypes

ExprParent

Indirect supertypes

Known direct subtypes

Predicates

controls	Holds if this guard evaluating to `branch` directly or indirectly controls the block `controlled`. That is, the evaluation of `controlled` is dominated by this guard evaluating to `branch`.
directlyControls	Holds if this guard evaluating to `branch` directly controls the block `controlled`. That is, the `true`- or `false`-successor of this guard (as given by `branch`) dominates `controlled`.
getBasicBlock	Gets the basic block containing this guard or the basic block containing the switch expression if the guard is a switch case.
getEnclosingCallable	Gets the immediately enclosing callable whose body contains this guard.
getEnclosingStmt	Gets the statement containing this guard.
hasBranchEdge	Holds if the evaluation of this guard to `branch` corresponds to the edge from `bb1` to `bb2`.
isEquality	Holds if this guard is an equality test between `e1` and `e2`. The test can be either `==`, `!=`, `.equals`, or a switch case. If the test is negated, that is `!=`, then `polarity` is false, otherwise `polarity` is true.

Inherited predicates

getAPrimaryQlClass	Gets the name of a primary CodeQL class to which this element belongs.	from Top
getFile	Gets the file associated with this element.	from Top
getLocation	Gets the source location for this element.	from Top
getNumberOfCommentLines	Gets the number of comment lines that this element ranges over.	from Top
getNumberOfLinesOfCode	Gets the number of lines of code that this element ranges over.	from Top
getPrimaryQlClasses	Gets a comma-separated list of the names of the primary CodeQL classes to which this element belongs.	from Top
getTotalNumberOfLines	Gets the total number of lines that this element ranges over, including lines of code, comment and whitespace-only lines.	from Top
hasLocationInfo	Holds if this element is at the specified location. The location spans column `startcolumn` of line `startline` to column `endcolumn` of line `endline` in file `filepath`. For more information, see Locations.	from Top
toString	Gets a textual representation of this element.	from Top

Charpred

Guard