r347402 - Mark lambda decl as invalid if a captured variable has an invalid type.

[Jorge Gorbe Moya via cfe-commits]

Author: jgorbe
Date: Wed Nov 21 09:49:37 2018
New Revision: 347402

URL: http://llvm.org/viewvc/llvm-project?rev=347402&view=rev
Log:
Mark lambda decl as invalid if a captured variable has an invalid type.

This causes the compiler to crash when trying to compute a layout for
the lambda closure type (see included test).

Added:
    cfe/trunk/test/SemaCXX/lambda-invalid-capture.cpp
Modified:
    cfe/trunk/lib/Sema/SemaExpr.cpp

Modified: cfe/trunk/lib/Sema/SemaExpr.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExpr.cpp?rev=347402&r1=347401&r2=347402&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaExpr.cpp (original)
+++ cfe/trunk/lib/Sema/SemaExpr.cpp Wed Nov 21 09:49:37 2018
@@ -14966,6 +14966,21 @@ static void addAsFieldToClosureType(Sema
     = FieldDecl::Create(S.Context, Lambda, Loc, Loc, nullptr, FieldType,
                         S.Context.getTrivialTypeSourceInfo(FieldType, Loc),
                         nullptr, false, ICIS_NoInit);
+  // If the variable being captured has an invalid type, mark the lambda class
+  // as invalid as well.
+  if (!FieldType->isDependentType()) {
+    if (S.RequireCompleteType(Loc, FieldType, diag::err_field_incomplete)) {
+      Lambda->setInvalidDecl();
+      Field->setInvalidDecl();
+    } else {
+      NamedDecl *Def;
+      FieldType->isIncompleteType(&Def);
+      if (Def && Def->isInvalidDecl()) {
+        Lambda->setInvalidDecl();
+        Field->setInvalidDecl();
+      }
+    }
+  }
   Field->setImplicit(true);
   Field->setAccess(AS_private);
   Lambda->addDecl(Field);

Added: cfe/trunk/test/SemaCXX/lambda-invalid-capture.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/lambda-invalid-capture.cpp?rev=347402&view=auto
==============================================================================
--- cfe/trunk/test/SemaCXX/lambda-invalid-capture.cpp (added)
+++ cfe/trunk/test/SemaCXX/lambda-invalid-capture.cpp Wed Nov 21 09:49:37 2018
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// Don't crash.
+
+struct g {
+  j; // expected-error {{C++ requires a type specifier for all declarations}}
+};
+
+void captures_invalid_type() {
+  g child;
+  auto q = [child]{};
+  const int n = sizeof(q);
+}
+
+void captures_invalid_array_type() {
+  g child[100];
+  auto q = [child]{};
+  const int n = sizeof(q);
+}