[ModuleUtils] Handle globals_ctors/dtors with non-literal type (PR56809)

If the global already exists, use its existing type, so we don't
try to mix literal and non-literal structs among the elements.

Fixes #56809.

llvm/lib/Transforms/Utils/ModuleUtils.cpp

@@ -31,18 +31,20 @@ static void appendToGlobalArray(StringRef ArrayName, Module &M, Function *F,
   // Get the current set of static global constructors and add the new ctor
   // to the list.
   SmallVector<Constant *, 16> CurrentCtors;
-  StructType *EltTy = StructType::get(
-      IRB.getInt32Ty(), PointerType::get(FnTy, F->getAddressSpace()),
-      IRB.getInt8PtrTy());
-
+  StructType *EltTy;
   if (GlobalVariable *GVCtor = M.getNamedGlobal(ArrayName)) {
+    EltTy = cast<StructType>(GVCtor->getValueType()->getArrayElementType());
     if (Constant *Init = GVCtor->getInitializer()) {
       unsigned n = Init->getNumOperands();
       CurrentCtors.reserve(n + 1);
       for (unsigned i = 0; i != n; ++i)
         CurrentCtors.push_back(cast<Constant>(Init->getOperand(i)));
     }
     GVCtor->eraseFromParent();
+  } else {
+    EltTy = StructType::get(
+        IRB.getInt32Ty(), PointerType::get(FnTy, F->getAddressSpace()),
+        IRB.getInt8PtrTy());
   }
 
   // Build a 3 field global_ctor entry.  We don't take a comdat key.

llvm/test/Transforms/LowerGlobalDestructors/non-literal-type.ll

@@ -0,0 +1,36 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals --include-generated-funcs --version 2
+; RUN: opt -passes=lower-global-dtors -S < %s | FileCheck %s
+
+%ty = type { i32, ptr, ptr }
+
+declare void @ctor()
+declare void @dtor()
+
+@llvm.global_ctors = appending global [1 x %ty] [%ty {i32 65535, ptr @ctor, ptr zeroinitializer }], align 8
+@llvm.global_dtors = appending global [1 x %ty] [%ty {i32 65535, ptr @dtor, ptr zeroinitializer }], align 8
+
+;.
+; CHECK: @[[__DSO_HANDLE:[a-zA-Z0-9_$"\\.-]+]] = extern_weak hidden constant i8
+; CHECK: @[[LLVM_GLOBAL_CTORS:[a-zA-Z0-9_$"\\.-]+]] = appending global [2 x %ty] [[[TY:%.*]] { i32 65535, ptr @ctor, ptr null }, [[TY]] { i32 65535, ptr @register_call_dtors, ptr null }]
+;.
+; CHECK-LABEL: define private void @call_dtors
+; CHECK-SAME: (ptr [[TMP0:%.*]]) {
+; CHECK-NEXT:  body:
+; CHECK-NEXT:    call void @dtor()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define private void @register_call_dtors() {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @__cxa_atexit(ptr @call_dtors, ptr null, ptr @__dso_handle)
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ne i32 [[CALL]], 0
+; CHECK-NEXT:    br i1 [[TMP0]], label [[FAIL:%.*]], label [[RETURN:%.*]]
+; CHECK:       fail:
+; CHECK-NEXT:    call void @llvm.trap()
+; CHECK-NEXT:    unreachable
+; CHECK:       return:
+; CHECK-NEXT:    ret void
+;
+;.
+; CHECK: attributes #[[ATTR0:[0-9]+]] = { cold noreturn nounwind }
+;.