[flang] Fix crash in statement function semantics (bug #80532) (#82702)

When statement function expressions are analyzed, ensure that the
semantics context has a valid location set, otherwise a type spec (like
"integer::") can lead to a crash.

Fixes https://github.com/llvm/llvm-project/issues/80532.

2 files changed, 3 insertions, 1 deletions

diff --git a/flang/lib/Semantics/expression.cpp b/flang/lib/Semantics/expression.cpp
index 8d817f077880..b957f773816b 100644
--- a/flang/lib/Semantics/expression.cpp
+++ b/flang/lib/Semantics/expression.cpp
@@ -4613,8 +4613,9 @@ evaluate::Expr<evaluate::SubscriptInteger> AnalyzeKindSelector(
     SemanticsContext &context, common::TypeCategory category,
     const std::optional<parser::KindSelector> &selector) {
   evaluate::ExpressionAnalyzer analyzer{context};
+  CHECK(context.location().has_value());
   auto restorer{
-      analyzer.GetContextualMessages().SetLocation(context.location().value())};
+      analyzer.GetContextualMessages().SetLocation(*context.location())};
   return analyzer.AnalyzeKindSelector(category, selector);
 }
 
diff --git a/flang/lib/Semantics/resolve-names.cpp b/flang/lib/Semantics/resolve-names.cpp
index 7f9909ee937d..eb61a76f1087 100644
--- a/flang/lib/Semantics/resolve-names.cpp
+++ b/flang/lib/Semantics/resolve-names.cpp
@@ -8475,6 +8475,7 @@ void ResolveNamesVisitor::FinishSpecificationPart(
     if (const auto *statement{std::get_if<
             parser::Statement<common::Indirection<parser::StmtFunctionStmt>>>(
             &decl.u)}) {
+      messageHandler().set_currStmtSource(statement->source);
       AnalyzeStmtFunctionStmt(statement->statement.value());
     }
   }