Revert to unoptimized behavior on Darwin

Author: Feoramund

base/runtime/virtual_memory_darwin.odin

@@ -100,42 +100,13 @@ _free_virtual_memory :: proc "contextless" (ptr: rawptr, size: int) {
 }
 
 _resize_virtual_memory :: proc "contextless" (ptr: rawptr, old_size: int, new_size: int, alignment: int) -> rawptr {
-	old_size_pages := old_size / PAGE_SIZE
-	new_size_pages := new_size / PAGE_SIZE
-	if old_size % PAGE_SIZE != 0 {
-		old_size_pages += 1
-	}
-	if new_size % PAGE_SIZE != 0 {
-		new_size_pages += 1
-	}
-
-	if new_size_pages == old_size_pages {
-		return ptr
-	} else if new_size_pages > old_size_pages {
-		new_address: u64
-		result_alloc := mach_vm_allocate(mach_task_self_, &new_address, u64(new_size), VM_FLAGS_ANYWHERE)
-		if result_alloc != 0 {
-			return nil
-		}
-
-		alignment_mask: u64
-		if alignment != 0 {
-			alignment_mask = u64(alignment) - 1
-		}
-
-		mach_vm_protect(mach_task_self_, new_address, u64(new_size), true, VM_PROT_READ|VM_PROT_WRITE)
-		mach_vm_protect(mach_task_self_, new_address, u64(new_size), false, VM_PROT_READ|VM_PROT_WRITE)
-		cur_protection, max_protection: i32
-		result_remap := mach_vm_remap(mach_task_self_, &new_address, u64(old_size), alignment_mask, VM_FLAGS_ANYWHERE, mach_task_self_, u64(uintptr(ptr)), true, &cur_protection, &max_protection, VM_INHERIT_COPY)
-		if result_remap != 0 {
-			return nil
-		}
-		mach_vm_deallocate(mach_task_self_, u64(uintptr(ptr)), u64(old_size))
-		return rawptr(uintptr(new_address))
+	result: rawptr = ---
+	if alignment == 0 {
+		result = _allocate_virtual_memory(new_size)
 	} else {
-		new_size_boundary := new_size_pages * PAGE_SIZE
-		shrink_by := u64(old_size - new_size)
-		mach_vm_deallocate(mach_task_self_, u64(uintptr(ptr) + uintptr(new_size_boundary)), shrink_by)
-		return rawptr(uintptr(ptr))
+		result = _allocate_virtual_memory_aligned(new_size, alignment)
 	}
+	intrinsics.mem_copy_non_overlapping(result, ptr, min(new_size, old_size))
+	mach_vm_deallocate(mach_task_self_, u64(uintptr(ptr)), u64(old_size))
+	return result
 }