[libc++] Mark std::pmr virtual functions as _LIBCPP_HIDE_FROM_ABI_VIRTUAL

Reviewed By: ldionne, Mordante, #libc

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D141864

Author: philnik777

libcxx/include/__memory_resource/monotonic_buffer_resource.h

@@ -80,7 +80,7 @@ class _LIBCPP_TYPE_VIS monotonic_buffer_resource : public memory_resource {
 
   monotonic_buffer_resource(const monotonic_buffer_resource&) = delete;
 
-  _LIBCPP_HIDE_FROM_ABI ~monotonic_buffer_resource() override { release(); }
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~monotonic_buffer_resource() override { release(); }
 
   monotonic_buffer_resource& operator=(const monotonic_buffer_resource&) = delete;
 
@@ -99,9 +99,9 @@ class _LIBCPP_TYPE_VIS monotonic_buffer_resource : public memory_resource {
 protected:
   void* do_allocate(size_t __bytes, size_t __alignment) override; // key function
 
-  _LIBCPP_HIDE_FROM_ABI void do_deallocate(void*, size_t, size_t) override {}
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void*, size_t, size_t) override {}
 
-  _LIBCPP_HIDE_FROM_ABI bool do_is_equal(const memory_resource& __other) const _NOEXCEPT override {
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL bool do_is_equal(const memory_resource& __other) const _NOEXCEPT override {
     return this == std::addressof(__other);
   }
 

libcxx/include/__memory_resource/synchronized_pool_resource.h

@@ -62,14 +62,14 @@ class _LIBCPP_TYPE_VIS synchronized_pool_resource : public memory_resource {
   _LIBCPP_HIDE_FROM_ABI pool_options options() const { return __unsync_.options(); }
 
 protected:
-  _LIBCPP_HIDE_FROM_ABI void* do_allocate(size_t __bytes, size_t __align) override {
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void* do_allocate(size_t __bytes, size_t __align) override {
 #  if !defined(_LIBCPP_HAS_NO_THREADS)
     unique_lock<mutex> __lk(__mut_);
 #  endif
     return __unsync_.allocate(__bytes, __align);
   }
 
-  _LIBCPP_HIDE_FROM_ABI void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL void do_deallocate(void* __p, size_t __bytes, size_t __align) override {
 #  if !defined(_LIBCPP_HAS_NO_THREADS)
     unique_lock<mutex> __lk(__mut_);
 #  endif

libcxx/include/__memory_resource/unsynchronized_pool_resource.h

@@ -70,7 +70,7 @@ class _LIBCPP_TYPE_VIS unsynchronized_pool_resource : public memory_resource {
 
   unsynchronized_pool_resource(const unsynchronized_pool_resource&) = delete;
 
-  _LIBCPP_HIDE_FROM_ABI ~unsynchronized_pool_resource() override { release(); }
+  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~unsynchronized_pool_resource() override { release(); }
 
   unsynchronized_pool_resource& operator=(const unsynchronized_pool_resource&) = delete;