From 2ce889fa4e5cab75fc65d03a4dfae52784d57db9 Mon Sep 17 00:00:00 2001
From: Raphael Isemann <teemperor@gmail.com>
Date: Mon, 30 Aug 2021 15:16:18 +0200
Subject: [PATCH] [lldb][NFC] Add size tests for empty records with alignment
 and with empty members

This came up during the Windows bot failure discussing after D105471 . See
also 3d9a9fa6911a5228ce799a7c639e94d322678934 .
---
 lldb/test/API/lang/c/sizeof/TestCSizeof.py     |  1 +
 lldb/test/API/lang/c/sizeof/main.c             |  7 ++++++-
 lldb/test/API/lang/cpp/sizeof/TestCPPSizeof.py |  4 ++++
 lldb/test/API/lang/cpp/sizeof/main.cpp         | 13 +++++++++++--
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/lldb/test/API/lang/c/sizeof/TestCSizeof.py b/lldb/test/API/lang/c/sizeof/TestCSizeof.py
index 5bcbc42e3dfc..67766833623d 100644
--- a/lldb/test/API/lang/c/sizeof/TestCSizeof.py
+++ b/lldb/test/API/lang/c/sizeof/TestCSizeof.py
@@ -14,5 +14,6 @@ class TestCase(TestBase):
         # Empty structs are not allowed in C, but Clang/GCC allow them and
         # give them a size of 0.
         self.expect_expr("sizeof(Empty) == sizeof_empty", result_value="true")
+        self.expect_expr("sizeof(EmptyMember) == sizeof_empty_member", result_value="true")
         self.expect_expr("sizeof(SingleMember) == sizeof_single", result_value="true")
         self.expect_expr("sizeof(PaddingMember) == sizeof_padding", result_value="true")
diff --git a/lldb/test/API/lang/c/sizeof/main.c b/lldb/test/API/lang/c/sizeof/main.c
index 08bf906edb4a..fa7bd2d46b1a 100644
--- a/lldb/test/API/lang/c/sizeof/main.c
+++ b/lldb/test/API/lang/c/sizeof/main.c
@@ -1,4 +1,7 @@
 struct Empty {};
+struct EmptyMember {
+  char i[0];
+};
 struct SingleMember {
   int i;
 };
@@ -9,13 +12,15 @@ struct PaddingMember {
 };
 
 const unsigned sizeof_empty = sizeof(struct Empty);
+const unsigned sizeof_empty_member = sizeof(struct EmptyMember);
 const unsigned sizeof_single = sizeof(struct SingleMember);
 const unsigned sizeof_padding = sizeof(struct PaddingMember);
 
 int main() {
   struct Empty empty;
+  struct EmptyMember empty_member;
   struct SingleMember single;
   struct PaddingMember padding;
   // Make sure globals are used.
-  return sizeof_empty + sizeof_single + sizeof_padding;
+  return sizeof_empty + sizeof_empty_member + sizeof_single + sizeof_padding;
 }
diff --git a/lldb/test/API/lang/cpp/sizeof/TestCPPSizeof.py b/lldb/test/API/lang/cpp/sizeof/TestCPPSizeof.py
index c6b54de34947..e7f4623ee91f 100644
--- a/lldb/test/API/lang/cpp/sizeof/TestCPPSizeof.py
+++ b/lldb/test/API/lang/cpp/sizeof/TestCPPSizeof.py
@@ -14,6 +14,10 @@ class TestCase(TestBase):
         # Empty structs/classes have size 1 in C++.
         self.expect_expr("sizeof(Empty) == sizeof_empty", result_value="true")
         self.expect_expr("sizeof(EmptyClass) == sizeof_empty_class", result_value="true")
+        self.expect_expr("sizeof(EmptyClassAligned) == sizeof_empty_class_aligned",
+                         result_value="true")
+        self.expect_expr("sizeof(ClassEmptyMember) == sizeof_class_empty_member",
+                         result_value="true")
         self.expect_expr("sizeof(SingleMember) == sizeof_single", result_value="true")
         self.expect_expr("sizeof(SingleMemberClass) == sizeof_single_class", result_value="true")
         self.expect_expr("sizeof(PaddingMember) == sizeof_padding", result_value="true")
diff --git a/lldb/test/API/lang/cpp/sizeof/main.cpp b/lldb/test/API/lang/cpp/sizeof/main.cpp
index 6c4da06cbef8..4a7a89a1307f 100644
--- a/lldb/test/API/lang/cpp/sizeof/main.cpp
+++ b/lldb/test/API/lang/cpp/sizeof/main.cpp
@@ -1,5 +1,9 @@
 struct Empty {};
 class EmptyClass {};
+class alignas(4) EmptyClassAligned {};
+class ClassEmptyMember {
+  int i[0];
+};
 
 struct SingleMember {
   int i;
@@ -19,6 +23,8 @@ class PaddingMemberClass {
 
 const unsigned sizeof_empty = sizeof(Empty);
 const unsigned sizeof_empty_class = sizeof(EmptyClass);
+const unsigned sizeof_empty_class_aligned = sizeof(EmptyClassAligned);
+const unsigned sizeof_class_empty_member = sizeof(ClassEmptyMember);
 const unsigned sizeof_single = sizeof(SingleMember);
 const unsigned sizeof_single_class = sizeof(SingleMemberClass);
 const unsigned sizeof_padding = sizeof(PaddingMember);
@@ -27,11 +33,14 @@ const unsigned sizeof_padding_class = sizeof(PaddingMemberClass);
 int main() {
   Empty empty;
   EmptyClass empty_class;
+  EmptyClassAligned empty_class_aligned;
+  ClassEmptyMember class_empty_member;
   SingleMember single;
   SingleMemberClass single_class;
   PaddingMember padding;
   PaddingMemberClass padding_class;
   // Make sure globals are used.
-  return sizeof_empty + sizeof_empty_class + sizeof_single +
-    sizeof_single_class + sizeof_padding + sizeof_padding_class;
+  return sizeof_empty + sizeof_empty_class + sizeof_class_empty_member +
+         sizeof_single + +sizeof_empty_class_aligned + sizeof_single_class +
+         sizeof_padding + sizeof_padding_class;
 }