[libc++][AIX] Fix trivial_abi return tests for unique_ptr/weak_ptr

The unique_ptr_ret and weak_ptr_ret tests are not expected to pass on
AIX. These tests check that unique_ptr and weak_ptr are returned by
value, but on AIX, all structs are always returned by reference.

```
3.9.6 Function Return Values
...

Note: Structures of any length and character strings longer than four
bytes are returned in a storage buffer allocated by the caller. The
address of this buffer is passed as a hidden first argument in GPR3,
which causes the first explicit argument word to be passed in GPR4. This
hidden argument is treated as a formal argument and corresponds to the
first word of the argument area.
```

Reviewed By: #powerpc, daltenty, #libc, Quuxplusone, philnik

Differential Revision: https://reviews.llvm.org/D119952

diff --git a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
index 01db9b8..946786e 100644 (file)
--- a/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/unique_ptr_ret.pass.cpp
@@ -6,8 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// XFAIL: LIBCXX-AIX-FIXME
-
 // <memory>
 
 // Test unique_ptr<T> with trivial_abi as return-type.
@@ -47,8 +45,9 @@ int main(int, char**) {
   //
   // With trivial_abi, local_addr is the address of a local variable in
   // make_val, and hence different from &ret.
-#if !defined(__i386__) && !defined(_WIN32)
+#if !defined(__i386__) && !defined(_WIN32) && !defined(_AIX)
   // On X86, structs are never returned in registers.
+  // On AIX, structs are never returned in registers.
   // Thus, unique_ptr will be passed indirectly even if it is trivial.
   // On Windows, structs with a destructor are always returned indirectly.
   assert((void*)&ret != local_addr);

diff --git a/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp b/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
index 3e3d978..050073c 100644 (file)
--- a/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
+++ b/libcxx/test/libcxx/memory/trivial_abi/weak_ptr_ret.pass.cpp
@@ -13,7 +13,6 @@
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
 
 // XFAIL: gcc
-// XFAIL: LIBCXX-AIX-FIXME
 
 #include <memory>
 #include <cassert>
@@ -49,8 +48,9 @@ int main(int, char**) {
   //
   // With trivial_abi, local_addr is the address of a local variable in
   // make_val, and hence different from &ret.
-#if !defined(__i386__) && !defined(__arm__) && !defined(_WIN32)
+#if !defined(__i386__) && !defined(__arm__) && !defined(_WIN32) && !defined(_AIX)
   // On X86, structs are never returned in registers.
+  // On AIX, structs are never returned in registers.
   // On ARM32, structs larger than 4 bytes cannot be returned in registers.
   // On Windows, structs with a destructor are always returned indirectly.
   // Thus, weak_ptr will be passed indirectly even if it is trivial.