Class DataFlow :: BarrierGuard

DEPRECATED: Use BarrierGuard module instead.

A guard that validates some expression.

To use this in a configuration, extend the class and provide a characteristic predicate precisely specifying the guard, and override checks to specify what is being validated and in which branch.

It is important that all extending classes in scope are disjoint.

Import path


                                import csharp

Direct supertypes

Guard

Indirect supertypes

Known direct subtypes

Predicates

checks	Holds if this guard validates `e` upon evaluating to `v`.
getAGuardedNode	Gets a node guarded by this guard.

Inherited predicates

controlsBasicBlock	Holds if basic block `bb` is guarded by this expression having value `v`.	from Guard
controlsBlock	Holds if basic block `controlled` is controlled by this control flow element with conditional value `s`. That is, `controlled` can only be reached from the callable entry point by going via the `s` edge out of some basic block ending with this element.	from ControlFlowElement
controlsNode	Holds if `cfn` is guarded by this expression having value `v`, where `sub` is a sub expression of this expression that is structurally equal to the expression belonging to `cfn`.	from Guard
controlsNode	Holds if `cfn` is guarded by this expression having value `v`.	from Guard
fromLibrary	Holds if this element is from an assembly.	from Element
fromSource	Holds if this element is from source code.	from Element
getAChild	Gets a child of this element, if any.	from Element
getAChildExpr	Gets a child expression of this element, if any.	from ExprOrStmtParent
getAChildStmt	Gets a child statement of this element, if any.	from ExprOrStmtParent
getAControlFlowEntryNode	Gets a first control flow node executed within this element.	from ControlFlowElement
getAControlFlowExitNode	Gets a potential last control flow node executed within this element.	from ControlFlowElement
getAControlFlowNode	Gets a control flow node for this element. That is, a node in the control flow graph that corresponds to this element.	from ControlFlowElement
getALocation	Gets a location of this element, including sources and assemblies.	from Expr
getAPrimaryQlClass	Gets the name of a primary CodeQL class to which this element belongs.	from Element
getAReachableElement	Gets an element that is reachable from this element.	from ControlFlowElement
getAValue	Gets a valid value for this guard. For example, if this guard is a test, then it can have Boolean values `true` and `false`.	from Guard
getAnnotatedType	Gets the annotated type of this expression.	from Expr
getAssembly	Gets the assembly that this element was compiled into.	from ControlFlowElement
getChild	Gets the `i`th child of this element (zero-based).	from ExprOrStmtParent
getChildExpr	Gets the `i`th child expression of this element (zero-based).	from ExprOrStmtParent
getChildStmt	Gets the `i`th child statement of this element (zero-based).	from ExprOrStmtParent
getEnclosingCallable	Gets the enclosing callable of this expression, if any.	from Expr
getEnclosingStmt	Gets the enclosing statement of this expression, if any.	from Expr
getExplicitArgumentName	Gets the explicit parameter name used to pass this expression as an argument for, if any. For example, if this expression is `0` in `M(second: 1, first: 0)` then the result is `"first"`.	from Expr
getFile	Gets the file containing this element.	from Element
getIndex	Gets the index of this element among its parent’s other children (zero-based).	from Element
getLanguage	Gets the “language” of this program element, as defined by the extension of the filename. For example, C# has language “cs”, and Visual Basic has language “vb”.	from Element
getLocation	Gets the location of this element. Where an element has locations in source and assemblies, choose the source location. If there are multiple assembly locations, choose only one.	from Element
getNumberOfChildren	Gets the number of children of this element.	from Element
getParent		from Expr
getPrimaryQlClasses	Gets a comma-separated list of the names of the primary CodeQL classes to which this element belongs.	from Element
getType	Gets the type of this expression.	from Expr
getValue	Gets the value of this expression, if any	from Expr
hasMaybeNullFlowState	Holds if the nullable flow state of this expression may be null.	from Expr
hasNotNullFlowState	Holds if the nullable flow state of this expression is not null.	from Expr
hasValue	Holds if this expression has a value.	from Expr
isEquality	Holds if this guard is an equality test between `e1` and `e2`. If the test is negated, that is `!=`, then `polarity` is false, otherwise `polarity` is true.	from Guard
isImplicit	Holds if this expression is generated by the compiler and does not appear explicitly in the source code.	from Expr
isLive	Holds if this element is live, that is this element can be reached from the entry point of its enclosing callable.	from ControlFlowElement
reachableFrom	Holds if the current element is reachable from `src`.	from ControlFlowElement
stripCasts	Gets an expression that is the result of stripping (recursively) all implicit and explicit casts from this expression, if any. For example, the result is `reader` if this expression is either `(IDisposable)reader` or `reader as IDisposable`.	from Expr
stripImplicitCasts	Gets an expression that is the result of stripping (recursively) all implicit casts from this expression, if any.	from Expr
toString	Gets a textual representation of this element.	from Element
toStringWithTypes	Gets the full textual representation of this element, including type information.	from Element