Merge pull request #7317 from hvitved/ruby/param-node-refactor

Ruby: Restructure `ParameterNode(Impl)`

Author: hvitved

ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll

@@ -320,7 +320,9 @@ class ReturningStatementNode extends NodeImpl, TReturningNode {
 }
 
 private module ParameterNodes {
-  abstract class ParameterNodeImpl extends ParameterNode, NodeImpl {
+  abstract class ParameterNodeImpl extends NodeImpl {
+    abstract Parameter getParameter();
+
     abstract predicate isSourceParameterOf(Callable c, int i);
 
     predicate isParameterOf(DataFlowCallable c, int i) {
@@ -341,6 +343,10 @@ private module ParameterNodes {
 
     override predicate isSourceParameterOf(Callable c, int i) { c.getParameter(i) = parameter }
 
+    override predicate isParameterOf(DataFlowCallable c, int i) {
+      this.isSourceParameterOf(c.asCallable(), i)
+    }
+
     override CfgScope getCfgScope() { result = parameter.getCallable() }
 
     override Location getLocationImpl() { result = parameter.getLocation() }
@@ -359,8 +365,14 @@ private module ParameterNodes {
 
     final MethodBase getMethod() { result = method }
 
+    override Parameter getParameter() { none() }
+
     override predicate isSourceParameterOf(Callable c, int i) { method = c and i = -1 }
 
+    override predicate isParameterOf(DataFlowCallable c, int i) {
+      this.isSourceParameterOf(c.asCallable(), i)
+    }
+
     override CfgScope getCfgScope() { result = method }
 
     override Location getLocationImpl() { result = method.getLocation() }
@@ -385,6 +397,10 @@ private module ParameterNodes {
 
     override predicate isSourceParameterOf(Callable c, int i) { c = method and i = -2 }
 
+    override predicate isParameterOf(DataFlowCallable c, int i) {
+      this.isSourceParameterOf(c.asCallable(), i)
+    }
+
     override CfgScope getCfgScope() { result = method }
 
     override Location getLocationImpl() {
@@ -407,6 +423,8 @@ private module ParameterNodes {
 
     SummaryParameterNode() { this = TSummaryParameterNode(sc, pos) }
 
+    override Parameter getParameter() { none() }
+
     override predicate isSourceParameterOf(Callable c, int i) { none() }
 
     override predicate isParameterOf(DataFlowCallable c, int i) { sc = c and i = pos }
@@ -442,7 +460,7 @@ class SummaryNode extends NodeImpl, TSummaryNode {
 /** A data-flow node that represents a call argument. */
 abstract class ArgumentNode extends Node {
   /** Holds if this argument occurs at the given position in the given call. */
-  predicate argumentOf(DataFlowCall call, int pos) { this.sourceArgumentOf(call.asCall(), pos) }
+  abstract predicate argumentOf(DataFlowCall call, int pos);
 
   abstract predicate sourceArgumentOf(CfgNodes::ExprNodes::CallCfgNode call, int pos);
 
@@ -457,6 +475,10 @@ private module ArgumentNodes {
 
     ExplicitArgumentNode() { this.asExpr() = arg }
 
+    override predicate argumentOf(DataFlowCall call, int pos) {
+      this.sourceArgumentOf(call.asCall(), pos)
+    }
+
     override predicate sourceArgumentOf(CfgNodes::ExprNodes::CallCfgNode call, int pos) {
       arg.isArgumentOf(call, pos)
     }
@@ -474,6 +496,10 @@ private module ArgumentNodes {
       exists(CfgNodes::ExprNodes::CallCfgNode c | c.getBlock() = this.asExpr())
     }
 
+    override predicate argumentOf(DataFlowCall call, int pos) {
+      this.sourceArgumentOf(call.asCall(), pos)
+    }
+
     override predicate sourceArgumentOf(CfgNodes::ExprNodes::CallCfgNode call, int pos) {
       pos = -2 and
       (

ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPublic.qll

@@ -83,9 +83,9 @@ class ExprNode extends Node, TExprNode {
  * The value of a parameter at function entry, viewed as a node in a data
  * flow graph.
  */
-class ParameterNode extends Node, TParameterNode {
+class ParameterNode extends Node, TParameterNode instanceof ParameterNodeImpl {
   /** Gets the parameter corresponding to this node, if any. */
-  Parameter getParameter() { none() }
+  final Parameter getParameter() { result = super.getParameter() }
 }
 
 /**