XCSG:CallSite
A CallSite is a DataFlow node representing the existence of a function call, and the return value of that call. Their TypeOf edges point to the return type of the Function called; for void functions, the type pointed to is Void.
Inputs passed to the called function (including parameters, the identity for object methods, and any other implicit inputs passed from the CallSite to the called function) are represented as CallInputPass nodes, connected to the associated CallSite using CallInputTo edges, and can be accessed from the CallSite by following those edges in reverse.
CallSites are subtyped into StaticCallSites, ObjectOrientedCallSites, and FunctionPointerCallSites.
A StaticCallSite represents a statically resolved call, and points to the exact Function called with an InvokedFunction edge; this may point to a first-class function, a ClassMethod, a Constructor, or to any non-virtual InstanceMethod (such as private methods in Java).
A ObjectOrientedCallSite represents object-oriented dynamic dispatch, and indicates the InvokedType (that is, the declared type of the variable to which the call is made) and the InvokedSignature (a Method declared in that type or, for inherited non-overridden methods, in a parent of that type).
A FunctionPointerCallSite represents calling a function pointed to by a FunctionPointer. The InvokedPointer is connected to the FunctionPointerCallSite by an InvokedBy edge.
Specification
| Metaclass | CallSite |
|---|---|
| Extends | DataFlow (Node) |
| Description | Represents the location at which a Function call occurs. |
| Direct Subkinds | FunctionPointerCallSite, ObjectOrientedCallSite, StaticDispatchCallSite |
|---|
| All Superkinds | DataFlow (Node), Node, ModelElement |
|---|
| Specified In Edges | ||||
|---|---|---|---|---|
| In Edge | Predecessor | Multiplicity | Description | |
| IdentityPassedTo | IdentityPass | 0..1 | Connects an IdentityPass node to a XCSG:CallSite, indicating that the IdentityPass node is the object receiving the call, and the input to the implicit Identity parameter. | |
| ParameterPassedTo | ParameterPass | ✱ | Connects a ParameterPass node to the CallSite representing the Function call that passes it. | |
| PassedTo | CallInput | ✱ | Connects a CallInput node to the CallSite that value is an input to.
| |
| Inherited From | In Edge | Predecessor | Multiplicity | Description |
| DataFlow (Node) | DataFlow (Edge) | DataFlow (Node) | ✱ | Connects DataFlow nodes to one another and to Variables, linking the origin of data to locations that it is modified or consumed. |
| Variable | ✱ | |||
| Specified Out Edges
| ||||
|---|---|---|---|---|
| Inherited From | Out Edge | Successor | Multiplicity | Description |
| DataFlow (Node) | ArrayIdentityFor | ArrayAccess | 1 | Connects a DataFlow (Node) containing an array reference or pointer to the ArrayAccess representing the associated ArrayRead or ArrayWrite.
|
| ArrayIndexFor | ArrayAccess | 1 | Connects a DataFlow (Node) containing a value used as an array index to the ArrayAccess representing the associated ArrayRead or ArrayWrite. | |
| Java:ArrayLengthPassedTo | ArrayInstantiation | 1 | Connects a DataFlow (Node) representing the integer length expression to an ArrayInstantiation. | |
| DataFlow (Edge) | DataFlow (Node) | ✱ | Connects DataFlow nodes to one another and to Variables, linking the origin of data to locations that it is modified or consumed.
| |
| Variable | ✱ | |||
| DefinedAs | TypeAlias | 0..1 | Connects a Variable or DataFlow node which received its Type via a TypeAlias (such as a C/C++ typedef) to that TypeAlias. | |
| InstanceVariableWritten | InstanceVariableAssignment | ✱ | Connects a value (DataFlow (Node) or Variable) representing an object instance to an InstanceVariableAssignment representing a write to a field of that object. | |
| TypeOf | Type | 1 | Links a Variable or DataFlow node to its Type | |
| Known Possible In Edges
| ||||
|---|---|---|---|---|
| Inherited From | In Edge | Predecessor | Multiplicity | Description |
| DataFlow (Node) | InterproceduralDataFlow | Variable | ✱ | Represents data flows between Functions, or involving Variables visible to multiple Functions.
|
| LocalDataFlow | Parameter | ✱ | Within the scope of a particular Function, connects Parameters to DataFlow nodes, and DataFlow nodes to one another, indicating flow of information within that Function.
| |
| DataFlow (Node) | ✱ | |||
| ProgramVariable | ✱ | |||
| Node | Contains | Node | 1 | Indicates that the predecessor contains the successor in a sense specified by the specific type of Contains edge. |
| Known Possible Out Edges
| ||||
|---|---|---|---|---|
| Inherited From | Out Edge | Successor | Multiplicity | Description |
| DataFlow (Node) | LocalDataFlow | DataFlow (Node) | ✱ | Within the scope of a particular Function, connects Parameters to DataFlow nodes, and DataFlow nodes to one another, indicating flow of information within that Function. |
| Node | Contains | Node | ✱ | Indicates that the predecessor contains the successor in a sense specified by the specific type of Contains edge. |
