Start arena

src/arena.h

@@ -0,0 +1,34 @@
+#pragma once
+#include "base_core.h"
+
+typedef U32 ArenaFlags;
+
+typedef struct ArenaParams ArenaParams;
+enum {
+    ArenaFlag_UseMalloc = (1 << 0),
+};
+struct ArenaParams {
+    U32 size;
+    ArenaFlags flags; // No flags defined yet
+};
+
+typedef struct Arena Arena;
+struct Arena {
+    Arena *current;
+    U8 *base;
+    U32 size;
+    U32 pos;
+    ArenaFlags flags;
+    Arena *prev;
+};
+
+StaticAssert(sizeof(Arena) <= 64);
+#define ARENA_HEADER_SZ 64
+
+
+INLINE U32 arena_available(const Arena *arena)
+{
+    return arena->size - arena->pos;
+}
+
+