libstrat: convert to experimental new (super-accurate) sf allocation semantics

libraries/libstratosphere/include/stratosphere/sf/sf_default_allocation_policy.hpp

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere/sf/sf_common.hpp>
+#include <stratosphere/sf/sf_allocation_policies.hpp>
+
+namespace ams::sf {
+
+    namespace impl {
+
+        void *DefaultAllocateImpl(size_t size, size_t align, size_t offset);
+        void DefaultDeallocateImpl(void *ptr, size_t size, size_t align, size_t offset);
+
+        template<typename T>
+        class DefaultAllocationPolicyAllocator {
+            private:
+                struct Holder {
+                    MemoryResource *allocator;
+                    typename std::aligned_storage<sizeof(T), alignof(T)>::type storage;
+                };
+            public:
+                void *Allocate(size_t size) {
+                    AMS_ASSERT(size == sizeof(T));
+                    return DefaultAllocateImpl(sizeof(Holder), alignof(Holder), offsetof(Holder, storage));
+                }
+
+                void Deallocate(void *ptr, size_t size) {
+                    AMS_ASSERT(size == sizeof(T));
+                    return DefaultDeallocateImpl(ptr, sizeof(Holder), alignof(Holder), offsetof(Holder, storage));
+                }
+        };
+
+    }
+
+    using DefaultAllocationPolicy = StatelessTypedAllocationPolicy<impl::DefaultAllocationPolicyAllocator>;
+
+    MemoryResource *GetGlobalDefaultMemoryResource();
+    MemoryResource *GetCurrentEffectiveMemoryResource();
+    MemoryResource *GetCurrentMemoryResource();
+    MemoryResource *GetNewDeleteMemoryResource();
+
+    MemoryResource *SetGlobalDefaultMemoryResource(MemoryResource *mr);
+    MemoryResource *SetCurrentMemoryResource(MemoryResource *mr);
+
+    class ScopedCurrentMemoryResourceSetter {
+        NON_COPYABLE(ScopedCurrentMemoryResourceSetter);
+        NON_MOVEABLE(ScopedCurrentMemoryResourceSetter);
+        private:
+            MemoryResource *m_prev;
+        public:
+            explicit ScopedCurrentMemoryResourceSetter(MemoryResource *mr);
+            ~ScopedCurrentMemoryResourceSetter();
+    };
+
+}