[CIR][Lowering] Fix lowering for multi dimensional array

clang/lib/CIR/Lowering/LoweringHelpers.cpp

@@ -64,6 +64,16 @@ mlir::Type getNestedTypeAndElemQuantity(mlir::Type Ty, unsigned &elemQuantity) {
 template <typename AttrTy, typename StorageTy>
 void convertToDenseElementsAttrImpl(mlir::cir::ConstArrayAttr attr,
                                     llvm::SmallVectorImpl<StorageTy> &values) {
+  if (auto stringAttr = mlir::dyn_cast<mlir::StringAttr>(attr.getElts())) {
+    if (auto arrayType = mlir::dyn_cast<mlir::cir::ArrayType>(attr.getType())) {
+      for (auto element : stringAttr) {
+        auto intAttr = mlir::cir::IntAttr::get(arrayType.getEltType(), element);
+        values.push_back(mlir::dyn_cast<AttrTy>(intAttr).getValue());
+      }
+      return;
+    }
+  }
+
   auto arrayAttr = mlir::cast<mlir::ArrayAttr>(attr.getElts());
   for (auto eltAttr : arrayAttr) {
     if (auto valueAttr = mlir::dyn_cast<AttrTy>(eltAttr)) {

clang/test/CIR/Lowering/array-init.c

@@ -8,3 +8,14 @@ void zeroInit() {
   int a[3] = {0, 0, 0};
 }
 
+// LLVM{LITERAL}: %1 = alloca [4 x [1 x i8]], i64 1, align 1, !dbg !9
+// LLVM{LITERAL}: store [4 x [1 x i8]] [[1 x i8] c"a", [1 x i8] c"b", [1 x i8] c"c", [1 x i8] c"d"], ptr %1, align 1, !dbg !9
+void charInit1() {
+  char arr[4][1] = {"a", "b", "c", "d"};
+}
+
+// LLVM{LITERAL}: %1 = alloca [4 x [2 x i8]], i64 1, align 1, !dbg !12
+// LLVM{LITERAL}: store [4 x [2 x i8]] [[2 x i8] c"ab", [2 x i8] c"cd", [2 x i8] c"ef", [2 x i8] c"gh"], ptr %1, align 1, !dbg !12
+void charInit2() {
+  char arr[4][2] = {"ab", "cd", "ef", "gh"};
+}