Merge pull request #16074 from jketema/reuse-val-cat

C++: Add value category column to the expr_reuse relation

Author: jketema

cpp/downgrades/abfce5c170f93e281948f7689ece373464fdaf87/expr_reuse.ql

@@ -0,0 +1,7 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+from Expr reuse, Expr original
+where expr_reuse(reuse, original, _)
+select reuse, original

cpp/downgrades/abfce5c170f93e281948f7689ece373464fdaf87/expr_types.ql

@@ -0,0 +1,22 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+class Type extends @type {
+  string toString() { none() }
+}
+
+predicate existingType(Expr expr, Type type, int value_category) {
+  expr_types(expr, type, value_category)
+}
+
+predicate reuseType(Expr reuse, Type type, int value_category) {
+  exists(Expr original |
+    expr_reuse(reuse, original, value_category) and
+    expr_types(original, type, _)
+  )
+}
+
+from Expr expr, Type type, int value_category
+where existingType(expr, type, value_category) or reuseType(expr, type, value_category)
+select expr, type, value_category