[PATCH] D81154: [AST][RecoveryExpr] Populate the dependence bits from CompoundStmt result expr to StmtExpr.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added a project: clang.

We lost errorBit for StmtExpr if a recoveryExpr is the result
expr of a CompoundStmt, which will lead to crashes.

  // `-StmtExpr
  //   `-CompoundStmt
  //     `-RecoveryExp
  ({ invalid(); });


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D81154

Files:
  clang/lib/AST/ComputeDependence.cpp
  clang/test/SemaCXX/invalid-constructor-init.cpp


Index: clang/test/SemaCXX/invalid-constructor-init.cpp
===================================================================
--- clang/test/SemaCXX/invalid-constructor-init.cpp
+++ clang/test/SemaCXX/invalid-constructor-init.cpp
@@ -14,6 +14,12 @@
   constexpr X2() {} // expected-error {{constexpr constructor never produces a constant expression}}
 };
 
+struct X3 {
+  int Y;
+  constexpr X3() // expected-error {{constexpr constructor never produces}}
+      : Y(({foo();})) {} // expected-error {{use of undeclared identifier 'foo'}}
+};
+
 struct CycleDelegate {
   int Y;
   CycleDelegate(int)
Index: clang/lib/AST/ComputeDependence.cpp
===================================================================
--- clang/lib/AST/ComputeDependence.cpp
+++ clang/lib/AST/ComputeDependence.cpp
@@ -136,6 +136,13 @@
   // lambda-expressions and GCC.
   if (TemplateDepth)
     D |= ExprDependence::ValueInstantiation;
+
+  // Populate dependence bits from the expr that consider to be the result
+  // of the compound statements.
+  if (const auto *CompoundExprResult =
+          dyn_cast_or_null<ValueStmt>(E->getSubStmt()->getStmtExprResult()))
+    if (const Expr *ResultExpr = CompoundExprResult->getExprStmt())
+      D |= ResultExpr->getDependence();
   return D;
 }
 


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