memory stuff

+internal/arenas.jai

@@ -77,7 +77,7 @@ ArenaToAllocator :: (arena: *Arena) -> Allocator {
    return .{ proc = JaiAllocatorProc, data = arena };
 }
 
-
+/// PanicArena is an Arena that panics when used.
 PanicArena :: () -> Arena {
    return .{ proc = PanicArenaProc };
 }
@@ -119,12 +119,12 @@ PanicArenaProc :: (
    if event == {
       case .Acquire;
          if new_size > 0
-          { Panic("jc: cannot acquire memory using the PanicArena", loc = caller); }
+          { Panic("jc: PanicArena, acquiring memory is not allowed", loc = caller); }
 
       case .Save;
-         Panic("jc: cannot save using the PanicArean", loc = caller);
+         Panic("jc: PanicArena, saving is not allowed", loc = caller);
       case .Restore;
-         Panic("jc: cannot restore using the PanicArean", loc = caller);
+         Panic("jc: PanicArena, restoring is not allowed", loc = caller);
    }
 
    return null;
@@ -143,7 +143,7 @@ BumpArenaProc :: (
    if event == {
       case .Setup;
          if bump.memory.data == null
-          { Panic("jc: BumpArena has no memory", loc = caller); }
+          { Panic("jc: BumpArena, no backing memory", loc = caller); }
          return arena_data;
 
       case .Teardown;
@@ -157,7 +157,7 @@ BumpArenaProc :: (
          ptr  := MemAlignForward(end, align);
          size := new_size + (ptr - end);
          if bump.offset + size > bump.memory.count
-          { Panic("jc: BumpArena out of memory", loc = caller); }
+          { Panic("jc: BumpArena, out of memory", loc = caller); }
 
          bump.offset += size;
          return ptr;
@@ -169,7 +169,7 @@ BumpArenaProc :: (
       case .Restore;
          wm := old_ptr.(int);
          if wm < 0 || wm >= bump.memory.count
-          { Panic("jc: BumpArena restored invalid savepoint", loc = caller); }
+          { Panic("jc: BumpArena, restored invalid savepoint", loc = caller); }
          bump.offset = wm;
    }
 
@@ -185,7 +185,128 @@ PagingArenaProc :: (
 
    caller: Source_Code_Location
 ) -> *void {
-   Panic("not implemented for PagingArena", loc = caller);
+   MaxPages :: 64;
+
+   PageArenaData :: struct {
+      pages:  [MaxPages]Page;
+      count:  int;
+      in_use: int;
+
+      Page :: struct {
+         base:   *u8;
+         offset: int;
+      }
+   }
+
+   // @note(judah): page 0 has a special offset because it stores the header
+   Page0Offset :: #run AlignForward(size_of(PageArenaData), align_of(PageArenaData));
+
+   NewPage :: inline (previous_base: *void) -> PageArenaData.Page {
+      p: PageArenaData.Page = ---;
+      p.base   = MemAcquirePage(.CommitImmediately);
+      p.offset = 0;
+      return p;
+   }
+
+   data := arena_data.(*PageArenaData);
+   if event == {
+      case .Setup;
+         page := NewPage(null);
+         data = page.base.(*PageArenaData);
+
+         page.offset = Page0Offset;
+         data.pages[0] = page;
+
+         data.in_use = 1;
+         data.count  = 1;
+
+         return data;
+
+      case .Teardown;
+         // @note(judah): release in reverse oreder so we don't release the memory
+         // containing the header until we don't need it anymore.
+         i := data.count - 1;
+         while i >= 0 {
+            page := data.pages[i];
+            if page.base != null
+             { MemReleasePage(page.base, PageSize); }
+
+            i -= 1;
+         }
+
+      case .Acquire;
+         Assert(data.count != 0, "jc: PageArena, no pages exist");
+
+         last := *data.pages[data.in_use - 1];
+         end  := last.base + last.offset;
+         if new_size == 0
+          { return end; }
+
+         ptr  := MemAlignForward(end, align);
+         size := new_size + (ptr - end);
+
+         // create or reuse page
+         if last.offset + size > PageSize {
+            if data.in_use >= MaxPages
+             { Panic("jc: PageArena, max page count"); }
+
+            page: *PageArenaData.Page;
+            if data.in_use < data.count {
+               page = *data.pages[data.in_use];
+            }
+            else {
+               p := NewPage(data.pages[data.count - 1].base);
+               data.pages[data.count] = p;
+               page = *data.pages[data.count];
+
+               data.count  += 1;
+            }
+
+            data.in_use += 1;
+
+            ptr  = page.base;
+            size = new_size;
+            last = page;
+         }
+
+         last.offset += size;
+         return ptr;
+
+      case .Reset;
+         for 0..data.count - 1 {
+            page := *data.pages[it];
+
+            if it == 0 {
+               page.offset = Page0Offset;
+            }
+            else {
+               page.offset = 0;
+            }
+         }
+
+         data.in_use = 1;
+
+      case .Save;
+         return data.in_use.(*void);
+
+      case .Restore;
+         in_use_at_save := old_ptr.(int);
+
+         // @note(judah): We need to restore from the savepoint to count
+         // because we could've created more pages inbetween save/restore
+         for in_use_at_save..data.count - 1 {
+            p := *data.pages[it];
+            if it == 0 {
+               p.offset = Page0Offset;
+            }
+            else {
+               p.offset = 0;
+            }
+         }
+
+         data.in_use = in_use_at_save;
+   }
+
    return null;
 } @jc.nodocs
 

+internal/arrays.jai

@@ -6,9 +6,8 @@
 ArrayAppend :: inline (arr: *[..]$T, values: ..T) -> *T {
    TrySetAllocator(arr,, allocator = ArenaToAllocator(*context.arena));
 
-   if values.count == 0 {
-      return basic.array_add(arr);
-   }
+   if values.count == 0
+    { return basic.array_add(arr); }
 
    count := arr.count;
    basic.array_add(arr, ..values);

+internal/builtin.jai

@@ -189,6 +189,7 @@ WriteStderrNumber :: #bake_arguments write_number(to_standard_error  = true); //
 
 #scope_file
 
+// @todo(judah): this probably needs to be exposed...
 DebugBuild :: #run -> bool {
    // @note(judah): there's not really a good way to detect opt level/build type,
    // so just check if debug info is being emitted.

+internal/memory.jai

@@ -1,6 +1,7 @@
 Kilobyte :: 1024;
 Megabyte :: 1024 * Kilobyte;
 Gigabyte :: 1024 * Megabyte;
+Terabyte :: 1024 * Gigabyte;
 
 DefaultAlign :: size_of(*void);
 
@@ -106,6 +107,63 @@ NextPowerOfTwo :: (x: int) -> int #no_aoc {
    return x + 1;
 }
 
+MemAcquirePageFlags :: enum_flags {
+   CommitImmediately;
+}
+
+MemAcquirePage :: (flags: MemAcquirePageFlags = 0, previous: *void = null) -> *void {
+   BaseAddress :: 1 * Terabyte;
+
+   #if OS == .MACOS {
+      addr: darwin.mach_vm_address_t = BaseAddress;
+      if previous != null {
+         addr = previous.(darwin.mach_vm_address_t) + PageSize;
+      }
+
+      res := darwin.mach_vm_allocate(darwin.mach_task_self(), *addr, PageSize, darwin.VM_FLAGS_ANYWHERE);
+      if res != 0
+       { Panic("jc: MemAcquirePage, failed to request page"); }
+
+      ptr := addr.(*void);
+      if flags & .CommitImmediately
+       { MemZero(ptr, PageSize); }
+
+      return ptr;
+   }
+   else {
+      Panic("todo: MemAcquirePage not implemented on this OS");
+   }
+
+   return null;
+}
+
+MemReleasePage :: (page: *void, size: int) {
+   #if OS == .MACOS {
+      res := darwin.mach_vm_deallocate(darwin.mach_task_self(), page.(darwin.mach_vm_address_t), size.(darwin.mach_vm_size_t));
+      if res != 0
+       { Panic("jc: MemReleasePage failed to deallocate page"); }
+   }
+   else {
+      Panic("todo: MemReleasePage not implemented on this OS");
+   }
+}
+
+PageSize :: #run -> uint {
+   #if OS == .MACOS {
+      page_size: darwin.mach_vm_size_t;
+      res := darwin.host_page_size(darwin.host_self(), *page_size);
+      if res != 0
+       { CompileError("failed to get host page size"); }
+
+      return page_size.(uint);
+   }
+   else {
+      CompileError("todo: PageSize not implemented on OS");
+   }
+
+   return 0;
+};
+
 
 #scope_module
 
@@ -133,3 +191,11 @@ TrySetAllocator :: (array: *[..]$T) #expand {
       array.allocator = context.allocator;
    }
 } @jc.nodocs
+
+
+#scope_file
+
+#if OS == {
+   case .MACOS;
+      darwin :: #import "jc/ext/darwin";
+}

PLAN.Judah

@@ -9,6 +9,19 @@ This is what I'm doing day-to-day.
 	: notes, todos, etc.
 	
 
+/ 09.08.25
+
++ implemented PagingArena on mac
++ implemented MemAcquirePage/MemReleasePage/PageSize on mac
++ panics have more information now
++ added Terabyte constant
++ deleted old ext/darwin
+
+: u32, s64 -> uint4, sint8?
+: ext/darwin needs to just bind frameworks
+: ext/darwin needs easy objc interop
+	
+
 / 09.07.25
 
 + replaced allocators with custom arenas
@@ -17,6 +30,7 @@ This is what I'm doing day-to-day.
 + fixed +internal's weird behavior in the test runner
 + ArrayAppend/ArrayGrow now wrap the current arena as the attached Allocator
 + ArenaMode -> ArenaEvent
++ added pointer alignment procs
 
 / 09.06.25
 

ext/darwin/Foundation/NSObject.jai

@@ -1 +0,0 @@
-NSObject :: struct {};

ext/darwin/Foundation/NSString.jai

@@ -1,21 +0,0 @@
-NSString :: struct {
-   // #as super: NSObject;
-}
-
-init :: (path: ) -> NSString {
-}
-
-
-sel: struct {
-   init_withBytes_length_encoding: objc.Sel;
-   init_contentsOfFile_encoding: objc.Sel;
-   UTF8String: objc.Sel;
-};
-
-init_everything :: () {
-   sel.init_withBytes_length_encoding = objc.sel_register_name("init:withBytes:length:encoding");
-   sel.init_contentsOfFile_encoding = objc.sel_register_name("init:contentsOfFile:encoding");
-   sel.UTF8String = objc.sel_register_name("UTF8String");
-}
-
-// #import "jc/meta/init"(init_everything);

ext/darwin/Foundation/module.jai

@@ -1,8 +0,0 @@
-NSObject :: struct {
-   id: u64;
-}
-
-NSString :: struct {
-   #as using isa: NSObject;
-}
-

ext/darwin/foundation.jai

@@ -1,38 +0,0 @@
-
-NSNumber :: struct {
-   // #as using isa: NSObject;
-}
-
-#scope_file;
-
-Sel :: uptr;
-
-sel: struct {
-   boolValue:        Sel; @boolValue
-   intValue:         Sel; @intValue
-   unsignedIntValue: Sel; @unsignedIntValue
-   floatValue:       Sel; @floatValue
-   doubleValue:      Sel; @doubleValue
-}
-
-#add_context InitFoundation :: () {
-   #import "Basic";
-
-   tmp: [512]u8;
-
-   base := (*sel).(*u8);
-   info := type_info(type_of(sel));
-   for info.members if it.notes.count != 0 {
-      name := it.notes[0];
-      memcpy(tmp.data, name.data, name.count);
-      tmp.data[name.count] = 0;
-
-      ptr := base + it.offset_in_bytes;
-      ptr.* = sel_register_name(tmp.data);
-      assert(ptr.* != 0, "failed to register selector: %", name);
-   }
-
-   print("%\n", info.*);
-}
-
-Foundation :: #library,system,no_dll,link_always "Foundation";

ext/darwin/kernel.jai

@@ -0,0 +1,44 @@
+kern_return_t :: s32;
+
+natural_t :: u32;
+boolean_t :: s32;
+
+vm_prot_t :: s32;
+vm_map_t  :: mach_port_t;
+
+mach_port_t       :: natural_t;
+mach_vm_address_t :: u64;
+mach_vm_size_t    :: u64;
+
+host_t :: *void;
+
+VM_FLAGS_FIXED              :: 0x0000;
+VM_FLAGS_ANYWHERE           :: 0x0001;
+VM_FLAGS_PURGABLE           :: 0x0002;
+VM_FLAGS_4GB_CHUNK          :: 0x0004;
+VM_FLAGS_RANDOM_ADDR        :: 0x0008;
+VM_FLAGS_NO_CACHE           :: 0x0010;
+VM_FLAGS_RESILIENT_CODESIGN :: 0x0020;
+VM_FLAGS_RESILIENT_MEDIA    :: 0x0040;
+VM_FLAGS_OVERWRITE          :: 0x4000;
+
+VM_PROT_READ    :: 0x1;
+VM_PROT_WRITE   :: 0x2;
+VM_PROT_EXECUTE :: 0x4;
+
+
+host_self :: () -> host_t #foreign Kernel;
+
+host_page_size :: (host: host_t, page_size: *mach_vm_size_t) -> kern_return_t #foreign Kernel;
+
+mach_task_self :: () -> mach_port_t #foreign Kernel;
+
+mach_vm_allocate :: (target: vm_map_t, address: *mach_vm_address_t, size:mach_vm_size_t , flags: s32) -> kern_return_t #foreign Kernel;
+
+mach_vm_deallocate :: (target: vm_map_t, address: mach_vm_address_t, size:mach_vm_size_t) -> kern_return_t #foreign Kernel;
+
+mach_vm_protect :: (target_task: vm_map_t, address: mach_vm_address_t, size: mach_vm_size_t, set_maximum: boolean_t, new_protection: vm_prot_t) -> kern_return_t #foreign Kernel;
+
+#scope_module
+
+Kernel :: #library,system "libc";

ext/darwin/module.jai

@@ -1,47 +1 @@
-#scope_export;
-
-UInt :: u64;
-
-Id    :: *object;
-Class :: *class;
-Sel   :: *selector;
-
-Bool :: u8;
-
-True  : Bool : 1;
-False : Bool : 0;
-
-msg_send       :: () #foreign objc "objc_msgSend";
-msg_send_super :: () #foreign objc "objc_msgSend_super";
-msg_send_fpret :: () #foreign objc "objc_msgSend_fpret";
-msg_send_stret :: () #foreign objc "objc_msgSend_stret";
-
-get_class :: (name: *u8) -> Class #foreign objc "objc_getClass";
-
-sel_get_name :: (sel: Sel) -> *u8 #foreign objc "sel_getName";
-sel_register_name :: (str: *u8) -> Sel #foreign objc "sel_registerName";
-sel_get_uid :: (str: *u8) -> Sel #foreign objc "sel_getUid";
-
-obj_get_class :: (obj: Id) -> Class #foreign objc "object_getClass";
-obj_set_class :: (obj: Id, cls: Class) -> Class #foreign objc "object_setClass";
-obj_is_class :: (obj: Id) -> Bool #foreign objc "object_isClass";
-obj_get_class_name :: (obj: Id) -> *u8 #foreign objc "object_getClassName";
-obj_copy :: (obj: Id, size: u64) -> Id #foreign objc "object_copy";
-obj_dispose :: (obj: Id) -> Id #foreign objc "object_dispose";
-
-class_get_name  :: (cls: Class) -> *u8 #foreign objc "class_getName";
-class_get_super :: (cls: Class) -> Class #foreign objc "class_getSuperclass";
-
-#scope_module;
-
-class    :: struct {};
-object   :: struct {};
-method   :: struct {};
-ivar     :: struct {};
-category :: struct {};
-protocol :: struct {};
-selector :: struct {};
-
-objc :: #library,system,link_always,no_dll "libobjc";
-
-#import "jc";
+#load "kernel.jai";