Implemented Region. Arena allocator now uses Region for OS specific allocation and page management.

include/arena.h

@@ -33,6 +33,8 @@
 
 #include <cstddef>
 
+#include "region.h"
+
 namespace mimir {
 class Arena
 {
@@ -53,14 +55,13 @@ public:
   // Reset the arena, potentially also releasing committed pages
   void reset();
 private:
-  std::byte* m_data;
+  Region m_region;
   size_t m_minSize;
-  size_t m_maxSize;
-  size_t m_committedSize;
   size_t m_usedSize;
 
   static const size_t kWatermarkLen = 8;
   size_t m_watermark[kWatermarkLen];
+
 }; // class Arena
 
 } // namespace mimir

include/mimir.h

@@ -34,6 +34,7 @@
 #include "arena.h"
 #include "block.h"
 #include "heap.h"
+#include "region.h"
 #include "util.h"
 
 namespace mimir {

include/region.h

@@ -0,0 +1,55 @@
+//
+//  region.h
+//  Kraken Engine / Mimir
+//
+//  Copyright 2026 Kearwood Gilbert. All rights reserved.
+//
+//  Redistribution and use in source and binary forms, with or without modification, are
+//  permitted provided that the following conditions are met:
+//
+//  1. Redistributions of source code must retain the above copyright notice, this list of
+//  conditions and the following disclaimer.
+//
+//  2. Redistributions in binary form must reproduce the above copyright notice, this list
+//  of conditions and the following disclaimer in the documentation and/or other materials
+//  provided with the distribution.
+//
+//  THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
+//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KEARWOOD GILBERT OR
+//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+//  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+//  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+//  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+//  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//  The views and conclusions contained in the software and documentation are those of the
+//  authors and should not be interpreted as representing official policies, either expressed
+//  or implied, of Kearwood Gilbert.
+//
+
+#pragma once
+
+#include <cstddef>
+
+namespace mimir {
+class Region
+{
+public:
+  Region();
+  ~Region();
+
+  bool init(size_t maxSize = 1ULL << 32);
+  bool resize(size_t size);
+  size_t getSize() const;
+  size_t getMaxSize() const;
+  std::byte* getAddress() const;
+
+private:
+  std::byte* m_data;
+  size_t m_committedSize;
+  size_t m_maxSize;
+};
+
+} // namespace mimir