C++: Ensure that 'PrintIR' for dataflow still compiles.

Author: MathiasVP

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/PrintIRFieldFlowSteps.qll

@@ -13,7 +13,7 @@ class FieldFlowPropertyProvider extends IRPropertyProvider {
   override string getOperandProperty(Operand operand, string key) {
     exists(PostFieldUpdateNode pfun, Content content |
       key = "store " + content.toString() and
-      operand = pfun.getPreUpdateNode().(IndirectOperand).getOperand() and
+      pfun.getPreUpdateNode().(IndirectOperand).hasOperandAndIndirectionIndex(operand, _) and
       result =
         strictconcat(string element, Node node |
           storeStep(node, content, pfun) and
@@ -25,7 +25,7 @@ class FieldFlowPropertyProvider extends IRPropertyProvider {
     or
     exists(Node node2, Content content |
       key = "read " + content.toString() and
-      operand = node2.(IndirectOperand).getOperand() and
+      node2.(IndirectOperand).hasOperandAndIndirectionIndex(operand, _) and
       result =
         strictconcat(string element, Node node1 |
           readStep(node1, content, node2) and

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/PrintIRUtilities.qll

@@ -18,9 +18,12 @@ private string stars(int k) {
 }
 
 string starsForNode(Node node) {
-  result = stars(node.(IndirectInstruction).getIndirectionIndex())
-  or
-  result = stars(node.(IndirectOperand).getIndirectionIndex())
+  exists(int indirectionIndex |
+    node.(IndirectInstruction).hasInstructionAndIndirectionIndex(_, indirectionIndex) or
+    node.(IndirectOperand).hasOperandAndIndirectionIndex(_, indirectionIndex)
+  |
+    result = stars(indirectionIndex)
+  )
   or
   not node instanceof IndirectInstruction and
   not node instanceof IndirectOperand and