add stats for number of Expr sub-classes

Author: Radvendii

src/libexpr/eval.cc

@@ -2955,7 +2955,35 @@ void EvalState::printStatistics()
         {"elements", memstats.nrValuesInEnvs.load()},
         {"bytes", bEnvs},
     };
-    topObj["nrExprs"] = Expr::nrExprs.load();
+    topObj["nrExprs"] = {
+        {"total", Expr::nrCreated.load()},
+        {"ExprInt", ExprInt::nrCreated.load()},
+        {"ExprFloat", ExprFloat::nrCreated.load()},
+        {"ExprString", ExprString::nrCreated.load()},
+        {"ExprPath", ExprPath::nrCreated.load()},
+        {"ExprVar", ExprVar::nrCreated.load()},
+        {"ExprInheritFrom", ExprInheritFrom::nrCreated.load()},
+        {"ExprSelect", ExprSelect::nrCreated.load()},
+        {"ExprOpHasAttr", ExprOpHasAttr::nrCreated.load()},
+        {"ExprAttr", ExprAttrs::nrCreated.load()},
+        {"ExprList", ExprList::nrCreated.load()},
+        {"ExprLambda", ExprLambda::nrCreated.load()},
+        {"ExprCall", ExprCall::nrCreated.load()},
+        {"ExprLet", ExprLet::nrCreated.load()},
+        {"ExprWith", ExprWith::nrCreated.load()},
+        {"ExprIf", ExprIf::nrCreated.load()},
+        {"ExprAssert", ExprAssert::nrCreated.load()},
+        {"ExprOpNot", ExprOpNot::nrCreated.load()},
+        {"ExprConcatStrings", ExprConcatStrings::nrCreated.load()},
+        {"ExprPos", ExprPos::nrCreated.load()},
+        {"ExprOpEq", ExprOpEq::nrCreated.load()},
+        {"ExprOpNEq", ExprOpNEq::nrCreated.load()},
+        {"ExprOpAnd", ExprOpAnd::nrCreated.load()},
+        {"ExprOpOr", ExprOpOr::nrCreated.load()},
+        {"ExprOpImpl", ExprOpImpl::nrCreated.load()},
+        {"ExprOpConcatLists", ExprOpConcatLists::nrCreated.load()},
+        {"ExprOpUpdate", ExprOpUpdate::nrCreated.load()},
+    };
     topObj["list"] = {
         {"elements", memstats.nrListElems.load()},
         {"bytes", bLists},