From 16664c68b59ebc93a52c8a38908e4863d1179929 Mon Sep 17 00:00:00 2001
From: Patedam <pgillen.pro@gmail.com>
Date: Sun, 18 Oct 2026 00:25:02 -0400
Subject: [PATCH] wok on arena

---
 Juliet/core/core.h       | 21 +++++++++++++++++++++
 Juliet/core/core_arena.c | 10 ++++++++++
 Juliet/core/core_arena.h | 39 +++++++++++++++++++++++++++++++++++++++
 Juliet/core/core_inc.c   |  1 +
 Juliet/core/core_inc.h   |  1 +
 5 files changed, 72 insertions(+)
 create mode 100644 Juliet/core/core_arena.c
 create mode 100644 Juliet/core/core_arena.h

diff --git a/Juliet/core/core.h b/Juliet/core/core.h
index 6f2e7aa..96ae9bb 100644
--- a/Juliet/core/core.h
+++ b/Juliet/core/core.h
@@ -5,6 +5,27 @@
 #define internal static
 #define global static
 
+// =============================================================================
+// Units
+
+#define KB(d) ((uint64)(d) << 10)
+#define MB(d) ((uint64)(d) << 20)
+#define GB(d) ((uint64)(d) << 30)
+
+// =============================================================================
+// Asserts
+
+#define StaticAssert(cond, ID) global uint8 GLUE(ID, __LINE__)[(cond) ? 1 : -1]
+
+// =============================================================================
+// Helpers
+
+#define GLUE_(A, B) A##B
+#define GLUE(A, B) GLUE_(A, B)
+
+// =============================================================================
+// Core Types
+
 typedef uint8_t  uint8;
 typedef uint16_t uint16;
 typedef uint32_t uint32;
diff --git a/Juliet/core/core_arena.c b/Juliet/core/core_arena.c
new file mode 100644
index 0000000..4580f44
--- /dev/null
+++ b/Juliet/core/core_arena.c
@@ -0,0 +1,10 @@
+// =============================================================================
+// Arena Functions
+
+internal Arena* arena_alloc_internal()
+{
+    Arena* arena = NULL;
+    return arena;
+}
+
+internal void arena_release(Arena* arena) {}
diff --git a/Juliet/core/core_arena.h b/Juliet/core/core_arena.h
new file mode 100644
index 0000000..8fd2657
--- /dev/null
+++ b/Juliet/core/core_arena.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#define ARENA_HEADER_SIZE 128
+
+// =============================================================================
+// Arena Types
+
+typedef struct Arena Arena;
+struct Arena
+{
+    Arena* previous;
+    Arena* current;
+    uint64 base_position;
+    uint64 position;
+    uint64 commit_size;
+    uint64 committed;
+    uint64 reserve_size;
+    uint64 reserved;
+
+#if BUILD_DEBUG
+    char* alloc_file;
+    int   alloc_line;
+    char* name;
+#endif
+};
+StaticAssert(sizeof(Arena) <= ARENA_HEADER_SIZE, arena_header_size_check);
+
+typedef struct TempArena TempArena;
+struct TempAren
+{
+    Arena* arena;
+    uint64 position;
+};
+
+// =============================================================================
+// Arena Functions
+
+global uint64 arena_default_reserve_size = MB(64);
+global uint64 arena_default_commit_size  = KB(64);
diff --git a/Juliet/core/core_inc.c b/Juliet/core/core_inc.c
index 48ce51c..0720eaf 100644
--- a/Juliet/core/core_inc.c
+++ b/Juliet/core/core_inc.c
@@ -1,5 +1,6 @@
 // clang-format off
 #include "core_string.c"
+#include "core_arena.c"
 #include "core_entry_point.c"
 // clang-format on
 
diff --git a/Juliet/core/core_inc.h b/Juliet/core/core_inc.h
index 398b883..daff020 100644
--- a/Juliet/core/core_inc.h
+++ b/Juliet/core/core_inc.h
@@ -4,6 +4,7 @@
 #include "core_defines.h"
 
 #include "core.h"
+#include "core_arena.h"
 #include "core_string.h"
 #include "core_entry_point.h"
 // clang-format on