[clang] [CIR]lAdd name for function type in vtable (PR #163839)

[via cfe-commits]

https://github.com/y-Adrian updated https://github.com/llvm/llvm-project/pull/163839

>From 7aed3bac0c69b768a13d34125a4608c7b94a7553 Mon Sep 17 00:00:00 2001
From: Adrian <zhaoxu7263 at 163.com>
Date: Fri, 17 Oct 2025 01:56:33 +0800
Subject: [PATCH] [CIR]llvm#163601:handle function type

---
 clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp |  3 +-
 clang/test/CIR/CodeGen/throws.cpp             | 52 +++++++++++++++++++
 2 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp b/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
index 88fedf1acc6a1..841d4898d1d7e 100644
--- a/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
@@ -957,8 +957,7 @@ const char *vTableClassNameForType(const CIRGenModule &cgm, const Type *ty) {
 
   case Type::FunctionNoProto:
   case Type::FunctionProto:
-    cgm.errorNYI("VTableClassNameForType: __function_type_info");
-    break;
+    return "_ZTVN10__cxxabiv120__function_type_infoE";
 
   case Type::Enum:
     return "_ZTVN10__cxxabiv116__enum_type_infoE";
diff --git a/clang/test/CIR/CodeGen/throws.cpp b/clang/test/CIR/CodeGen/throws.cpp
index 53af1efc22cd4..8d56f772e28a5 100644
--- a/clang/test/CIR/CodeGen/throws.cpp
+++ b/clang/test/CIR/CodeGen/throws.cpp
@@ -244,3 +244,55 @@ void throw_enum_class_expr() {
 // OGCG: store i32 0, ptr %[[EXCEPTION_ADDR]], align 16
 // OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIZ21throw_enum_class_exprvE4Test, ptr null)
 // OGCG: unreachable
+
+void throw_func_prototype_type() {
+  typedef int FuncProto(int, double);
+  FuncProto* fptr;
+  throw fptr;
+}
+
+// CIR: %[[F_ADDR:.*]] = cir.alloca !cir.ptr{{.*}}, ["fptr"]
+// CIR: %[[EXCEPTION_ADDR:.*]] = cir.alloc.exception 8 -> !cir.ptr{{.*}}
+// CIR: %[[TMP_F:.*]] = cir.load{{.*}} %[[F_ADDR]] : !cir.ptr{{.*}}, !cir.ptr{{.*}}
+// CIR: cir.store{{.*}} %[[TMP_F]], %[[EXCEPTION_ADDR]] : !cir.ptr{{.*}}, !cir.ptr{{.*}}
+// CIR: cir.throw %[[EXCEPTION_ADDR]] : !cir.ptr{{.*}}, @_ZTI{{.*}}
+// CIR: cir.unreachable
+
+// LLVM: %[[F_ADDR:.*]] = alloca ptr, i64 1, align 8
+// LLVM: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 8)
+// LLVM: %[[TMP_F:.*]] = load ptr, ptr %[[F_ADDR]], align 8
+// LLVM: store ptr %[[TMP_F]], ptr %[[EXCEPTION_ADDR]], align 16
+// LLVM: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTI{{.*}}, ptr null)
+
+// OGCG: %[[F_ADDR:.*]] = alloca ptr, align 8
+// OGCG: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 8)
+// OGCG: %[[TMP_F:.*]] = load ptr, ptr %[[F_ADDR]], align 8
+// OGCG: store ptr %[[TMP_F]], ptr %[[EXCEPTION_ADDR]], align 16
+// OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTI{{.*}}, ptr null)
+// OGCG: unreachable
+
+void throw_func_no_prototype_type() {
+  typedef void FuncNoProto();
+  FuncNoProto* fptr;
+  throw fptr;
+}
+
+// CIR: %[[FNP_ADDR:.*]] = cir.alloca !cir.ptr{{.*}}, ["fptr"]
+// CIR: %[[EXCEPTION_ADDR_FN:.*]] = cir.alloc.exception 8 -> !cir.ptr{{.*}}
+// CIR: %[[TMP_FNP:.*]] = cir.load{{.*}} %[[FNP_ADDR]] : !cir.ptr{{.*}}, !cir.ptr{{.*}}
+// CIR: cir.store{{.*}} %[[TMP_FNP]], %[[EXCEPTION_ADDR_FN]] : !cir.ptr{{.*}}, !cir.ptr{{.*}}
+// CIR: cir.throw %[[EXCEPTION_ADDR_FN]] : !cir.ptr{{.*}}, @_ZTI{{.*}}
+// CIR: cir.unreachable
+
+// LLVM: %[[FNP_ADDR:.*]] = alloca ptr, i64 1, align 8
+// LLVM: %[[EXCEPTION_ADDR_FN:.*]] = call ptr @__cxa_allocate_exception(i64 8)
+// LLVM: %[[TMP_FNP:.*]] = load ptr, ptr %[[FNP_ADDR]], align 8
+// LLVM: store ptr %[[TMP_FNP]], ptr %[[EXCEPTION_ADDR_FN]], align 16
+// LLVM: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR_FN]], ptr @_ZTI{{.*}}, ptr null)
+
+// OGCG: %[[FNP_ADDR:.*]] = alloca ptr, align 8
+// OGCG: %[[EXCEPTION_ADDR_FN:.*]] = call ptr @__cxa_allocate_exception(i64 8)
+// OGCG: %[[TMP_FNP:.*]] = load ptr, ptr %[[FNP_ADDR]], align 8
+// OGCG: store ptr %[[TMP_FNP]], ptr %[[EXCEPTION_ADDR_FN]], align 16
+// OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR_FN]], ptr @_ZTI{{.*}}, ptr null)
+// OGCG: unreachable
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