Add CallNode class

Author: aibaars

ql/src/codeql_ruby/ApiGraphs.qll

@@ -46,7 +46,7 @@ module API {
     /**
      * Gets a call to a method on the receiver represented by this API component.
      */
-    DataFlow::Node getAMethodCall(string method) {
+    DataFlow::CallNode getAMethodCall(string method) {
       result = getMethodCallNode(method).getAnImmediateUse()
     }
 

ql/src/codeql_ruby/controlflow/CfgNodes.qll

@@ -235,6 +235,11 @@ module ExprNodes {
     /** Gets the `n`th argument of this call. */
     final ExprCfgNode getArgument(int n) { e.hasCfgChild(e.getArgument(n), this, result) }
 
+    /** Gets the the keyword argument whose key is `keyword` of this call. */
+    final ExprCfgNode getKeywordArgument(string keyword) {
+      e.hasCfgChild(e.getKeywordArgument(keyword), this, result)
+    }
+
     /** Gets the number of arguments of this call. */
     final int getNumberOfArguments() { result = e.getNumberOfArguments() }
 

ql/src/codeql_ruby/dataflow/internal/DataFlowPublic.qll

@@ -39,6 +39,22 @@ class Node extends TNode {
   }
 }
 
+/** A data-flow node corresponding to a call in the control-flow graph. */
+class CallNode extends LocalSourceNode {
+  private CfgNodes::ExprNodes::CallCfgNode node;
+
+  CallNode() { node = this.asExpr() }
+
+  /** Gets the data-flow node corresponding to the receiver of the call corresponding to this data-flow node */
+  Node getReceiver() { result.asExpr() = node.getReceiver() }
+
+  /** Gets the data-flow node corresponding to the `n`th argument of the call corresponding to this data-flow node */
+  Node getArgument(int n) { result.asExpr() = node.getArgument(n) }
+
+  /** Gets the data-flow node corresponding to the named argument of the call corresponding to this data-flow node */
+  Node getKeywordArgument(string name) { result.asExpr() = node.getKeywordArgument(name) }
+}
+
 /**
  * An expression, viewed as a node in a data flow graph.
  *