Fix translation of union array members

Author: lucic71

cpp2rust/converter/converter_lib.cpp

@@ -130,6 +130,16 @@ bool IsInMainFile(const clang::Decl *decl) {
   return src_mgr.isInMainFile(src_mgr.getExpansionLoc(loc));
 }
 
+bool IsUnionArrayMember(const clang::Expr *base) {
+  if (auto *me =
+          clang::dyn_cast<clang::MemberExpr>(base->IgnoreParenImpCasts())) {
+    if (auto *fd = clang::dyn_cast<clang::FieldDecl>(me->getMemberDecl())) {
+      return fd->getParent()->isUnion() && fd->getType()->isArrayType();
+    }
+  }
+  return false;
+}
+
 bool IsUserDefinedDecl(const clang::Decl *decl) {
   const auto &ctx = decl->getASTContext();
   const auto &src_mgr = ctx.getSourceManager();

cpp2rust/converter/converter_lib.h

@@ -40,6 +40,8 @@ bool IsComparisonWithNullOp(const clang::BinaryOperator *expr);
 
 bool IsInMainFile(const clang::Decl *decl);
 
+bool IsUnionArrayMember(const clang::Expr *base);
+
 bool IsUserDefinedDecl(const clang::Decl *decl);
 
 bool RefersToUserDefinedDecl(const clang::Expr *expr);

cpp2rust/converter/models/converter_refcount.cpp

@@ -378,7 +378,8 @@ std::string ConverterRefCount::ConvertPtrType(clang::QualType type) {
 bool ConverterRefCount::VisitArraySubscriptExpr(
     clang::ArraySubscriptExpr *expr) {
   auto *base = expr->getBase();
-  if (base->IgnoreCasts()->getType()->isPointerType()) {
+  if (base->IgnoreCasts()->getType()->isPointerType() ||
+      (isLValue() && IsUnionArrayMember(base))) {
     ConvertPointerSubscript(expr);
   } else {
     if (!base->IgnoreCasts()->getType()->isArrayType()) {