[OPENMP]Fix PR42068: Vla type is not captured.

If the variably modified type is declared outside of the captured region
and then used in the cast expression along with array subscript
expression, the type is not captured and it leads to the compiler crash.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@364080 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 9b09059c15..8fd7e5eafa 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -4737,6 +4737,33 @@ Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
   assert(VK == VK_RValue || LangOpts.CPlusPlus ||
          !ResultType.isCForbiddenLValueType());
 
+  if (LHSExp->IgnoreParenImpCasts()->getType()->isVariablyModifiedType() &&
+      FunctionScopes.size() > 1) {
+    if (auto *TT =
+            LHSExp->IgnoreParenImpCasts()->getType()->getAs<TypedefType>()) {
+      for (auto I = FunctionScopes.rbegin(),
+                E = std::prev(FunctionScopes.rend());
+           I != E; ++I) {
+        auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
+        if (CSI == nullptr)
+          break;
+        DeclContext *DC = nullptr;
+        if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
+          DC = LSI->CallOperator;
+        else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
+          DC = CRSI->TheCapturedDecl;
+        else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
+          DC = BSI->TheDecl;
+        if (DC) {
+          if (DC->containsDecl(TT->getDecl()))
+            break;
+          captureVariablyModifiedType(
+              Context, LHSExp->IgnoreParenImpCasts()->getType(), CSI);
+        }
+      }
+    }
+  }
+
   return new (Context)
       ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc);
 }