[flang-commits] [flang] [flang][runtime] Enable more code for offload device builds. (PR #67489)

[Peter Klausler via flang-commits]

================
@@ -12,31 +12,124 @@
 #ifndef FORTRAN_RUNTIME_MEMORY_H_
 #define FORTRAN_RUNTIME_MEMORY_H_
 
+#include "flang/Runtime/api-attrs.h"
+#include <cassert>
 #include <memory>
+#include <type_traits>
 
 namespace Fortran::runtime {
 
 class Terminator;
 
-[[nodiscard]] void *AllocateMemoryOrCrash(
+[[nodiscard]] RT_API_ATTRS void *AllocateMemoryOrCrash(
     const Terminator &, std::size_t bytes);
 template <typename A> [[nodiscard]] A &AllocateOrCrash(const Terminator &t) {
   return *reinterpret_cast<A *>(AllocateMemoryOrCrash(t, sizeof(A)));
 }
-void FreeMemory(void *);
-template <typename A> void FreeMemory(A *p) {
+RT_API_ATTRS void FreeMemory(void *);
+template <typename A> RT_API_ATTRS void FreeMemory(A *p) {
   FreeMemory(reinterpret_cast<void *>(p));
 }
 template <typename A> void FreeMemoryAndNullify(A *&p) {
   FreeMemory(p);
   p = nullptr;
 }
 
-template <typename A> struct OwningPtrDeleter {
-  void operator()(A *p) { FreeMemory(p); }
+// Very basic implementation mimicking std::unique_ptr.
+// It should work for any offload device compiler.
+// It uses a fixed memory deleter based on FreeMemory(),
+// and does not support array objects with runtime length.
+template <typename A>
+class OwningPtr {
+public:
+  using pointer_type = A *;
+
+  OwningPtr() = default;
+  RT_API_ATTRS explicit OwningPtr(pointer_type p) : ptr_(p) {}
+  RT_API_ATTRS OwningPtr(const OwningPtr &) = delete;
+  RT_API_ATTRS OwningPtr& operator=(const OwningPtr &) = delete;
+  RT_API_ATTRS OwningPtr(OwningPtr &&other) {
+    ptr_ = other.ptr_;
+    other.ptr_ = pointer_type();
----------------
klausler wrote:

Here and throughout: `pointer_type{}` is more current C++ usage.

https://github.com/llvm/llvm-project/pull/67489