Python: Improve CallCfgNode interface

tausbn · web-flow · commit 903f364dab78 · 2021-04-07T13:31:12.000Z
Call nodes are always local sources (specifically sources of the return
value of the call), and so inheriting from `LocalSourceNode` will have
no effect on results, but _should_ make it a bit more smooth to use the
API.
diff --git a/python/ql/src/semmle/python/dataflow/new/internal/DataFlowPublic.qll b/python/ql/src/semmle/python/dataflow/new/internal/DataFlowPublic.qll
@@ -180,7 +180,7 @@ class CfgNode extends Node, TCfgNode {
 }
 
 /** A data-flow node corresponding to a `CallNode` in the control-flow graph. */
-class CallCfgNode extends CfgNode {
+class CallCfgNode extends CfgNode, LocalSourceNode {
   override CallNode node;
 
   /**

Original file line number	Diff line number	Diff line change
`@@ -180,7 +180,7 @@ class CfgNode extends Node, TCfgNode {`
`180`	`180`	`}`
`181`	`181`
`182`	`182`	/** A data-flow node corresponding to a `CallNode` in the control-flow graph. */
`183`		`-class CallCfgNode extends CfgNode {`
	`183`	`+class CallCfgNode extends CfgNode, LocalSourceNode {`
`184`	`184`	`override CallNode node;`
`185`	`185`
`186`	`186`	`/**`