Multitype allocator stub

network/windows/Cargo.toml

@@ -12,4 +12,4 @@ bgtu-networks-2-network-abstract = { path = "../abstract" }
 [dependencies.windows]
 version = ">=0.41.0, <=0.62.2"
 registry = "crates-io"
-features = ["Win32_System_IO", "Win32_Networking", "Win32_Networking_WinSock", "Win32_System_Diagnostics", "Win32_System_Diagnostics_Debug", "Win32_System_Threading"]
+features = ["Win32_System_IO", "Win32_Networking", "Win32_Networking_WinSock", "Win32_System_Diagnostics", "Win32_System_Diagnostics_Debug", "Win32_System_Threading", "Win32_System_Memory"]

network/windows/src/errors.rs

@@ -2,7 +2,7 @@ use std::ffi::{CStr, CString, c_char};
 use std::ptr;
 use std::ptr::null_mut;
 use std::slice::from_raw_parts_mut;
-use windows::Win32::Foundation::{HLOCAL, LocalFree};
+use windows::Win32::Foundation::{HLOCAL, LocalFree, WIN32_ERROR};
 use windows::Win32::Networking::WinSock::WSA_ERROR;
 use windows::Win32::System::Diagnostics::Debug::{
     FORMAT_MESSAGE_ALLOCATE_BUFFER, FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS,
@@ -39,6 +39,12 @@ impl ErrCode for HRESULT {
     }
 }
 
+impl ErrCode for WIN32_ERROR {
+    fn to_dword(&self) -> u32 {
+        return self.0
+    }
+}
+
 pub(super) fn throw_from_windows_err_code(code: impl ErrCode) -> ! {
     panic!(
         "Windows error [{:X}]: {}",

network/windows/src/eventloop/allocator.rs

@@ -1,30 +1,95 @@
-use std::collections::HashMap;
-use std::mem::uninitialized;
+use crate::errors::throw_from_windows_err_code;
+use std::mem::{offset_of, uninitialized};
 use std::pin::Pin;
 use std::ptr;
+use std::ptr::{NonNull, null_mut};
+use windows::Win32::Foundation::{GetLastError, HANDLE};
+use windows::Win32::System::Memory::{HEAP_FLAGS, HEAP_NO_SERIALIZE, HeapAlloc, HeapCreate};
 
-pub(crate) struct Allocator<T> {
-    map: HashMap<usize, Pin<Box<T>>>,
+pub(crate) struct Allocator {
+    win_heap: HANDLE,
+    last: Option<NonNull<dyn Cell>>,
 }
 
-impl<T> Allocator<T> {
+trait Cell {
+    fn get_prev(&self) -> Option<NonNull<dyn Cell>>;
+    fn set_prev(&mut self, p: Option<NonNull<dyn Cell>>);
+    fn get_next(&self) -> Option<NonNull<dyn Cell>>;
+    fn set_next(&mut self, p: Option<NonNull<dyn Cell>>);
+}
+
+struct CellImpl<T> {
+    prev: Option<NonNull<dyn Cell>>,
+    next: Option<NonNull<dyn Cell>>,
+    value: T,
+}
+
+impl<T> Cell for CellImpl<T> {
+    fn get_prev(&self) -> Option<NonNull<dyn Cell>> {
+        return self.prev;
+    }
+
+    fn set_prev(&mut self, p: Option<NonNull<dyn Cell>>) {
+        self.prev = p;
+    }
+
+    fn get_next(&self) -> Option<NonNull<dyn Cell>> {
+        return self.next;
+    }
+
+    fn set_next(&mut self, p: Option<NonNull<dyn Cell>>) {
+        self.next = p;
+    }
+}
+
+impl Allocator {
     pub fn new() -> Self {
-        return Self {
-            map: HashMap::new(),
+        unsafe {
+            let h;
+            match HeapCreate(HEAP_NO_SERIALIZE, 0, 0) {
+                Ok(hh) => h = hh,
+                Err(err) => throw_from_windows_err_code(err.code()),
+            }
+            return Allocator {
+                win_heap: h,
+                last: None,
             };
         }
-
-    pub unsafe fn alloc<'s>(&'s mut self) -> Pin<&'s mut T> {
-        let ptr = Box::pin(uninitialized::<T>());
-        let addr = ptr::from_ref(ptr.as_ref().get_ref()).addr();
-        self.map.insert(addr, ptr);
-        return self
-            .map
-            .get_mut(&addr)
-            .unwrap_or_else(|| unreachable!())
-            .as_mut();
     }
 
-    pub unsafe fn free(&mut self, p: Pin<&mut T>) {
+    pub unsafe fn alloc<'s, T: Drop + 'static>(
+        &'s mut self,
+        init: impl FnOnce(Pin<&mut T>),
+    ) -> Pin<&'s mut T> {
+        let mut p = NonNull::new(
+            HeapAlloc(
+                self.win_heap,
+                HEAP_FLAGS::default(),
+                size_of::<CellImpl<T>>(),
+            )
+            .cast::<CellImpl<T>>(),
+        )
+        .unwrap_or_else(|| throw_from_windows_err_code(GetLastError()));
+
+        if let Some(mut last) = self.last {
+            last.as_mut().set_next(Some(p));
+        }
+        p.as_mut().prev = self.last;
+        p.as_mut().next = None;
+        self.last = Some(p);
+
+        init(Pin::new_unchecked(&mut p.as_mut().value));
+
+        return Pin::new_unchecked(&mut p.as_mut().value);
+    }
+
+    pub unsafe fn free<T: Drop>(&mut self, p: Pin<&mut T>) {
+        let p = Pin::into_inner_unchecked(p);
+        let c = NonNull::new_unchecked(
+            NonNull::new_unchecked(p)
+                .as_ptr()
+                .map_addr(|a| a - offset_of!(CellImpl<T>, value))
+                .cast::<CellImpl<T>>(),
+        );
     }
 }

network/windows/src/eventloop/mod.rs

@@ -15,16 +15,16 @@ use windows::Win32::System::IO::OVERLAPPED;
 use windows::Win32::System::Threading::SleepEx;
 
 pub unsafe fn run_eventloop<Ctx: ServersContext<WindowsAddressKnown>>(ctx: *mut Ctx) {
-    let mut heap = Allocator::<IoTask<CallbackData<_>>>::new();
+    let mut heap = Allocator::new();
 
     let mut socket = WindowsOverlappingIcmpSocket::new();
 
-    let mut recv_task = NonNull::from_mut(&mut heap).as_mut().alloc();
-    CallbackData::init_recv(
-        &mut recv_task,
+    let mut recv_task = NonNull::from_mut(&mut heap).as_mut().alloc(|mut p|  CallbackData::init_recv(
+        &mut p,
         NonNull::new_unchecked(ctx),
         NonNull::from_mut(&mut heap),
-    );
+    ));
+
 
     let mut is_receive_enabled = false;
 
@@ -33,13 +33,13 @@ pub unsafe fn run_eventloop<Ctx: ServersContext<WindowsAddressKnown>>(ctx: *mut
 
         let mut should_recv_being_enabled = false;
         for address in it {
-            let mut task = NonNull::from_mut(&mut heap).as_mut().alloc();
-            CallbackData::init_send(
-                &mut task,
+            let mut task = NonNull::from_mut(&mut heap).as_mut().alloc(|mut p| CallbackData::init_send(
+                &mut p,
                 NonNull::new_unchecked(ctx),
                 NonNull::from_mut(&mut heap),
                 address,
-            );
+            ));
+
 
             socket.send(&mut task, Some(sending_done::<Ctx>));
             should_recv_being_enabled = true;
@@ -56,7 +56,7 @@ pub unsafe fn run_eventloop<Ctx: ServersContext<WindowsAddressKnown>>(ctx: *mut
 
 struct CallbackData<Ctx: ServersContext<WindowsAddressKnown>> {
     ctx: NonNull<Ctx>,
-    allocator: NonNull<Allocator<IoTask<Self>>>,
+    allocator: NonNull<Allocator>,
     address: WindowsAddressKnown,
     __flags: u32,
     __addrs_size: i32,
@@ -66,7 +66,7 @@ impl<Ctx: ServersContext<WindowsAddressKnown>> CallbackData<Ctx> {
     fn init_send(
         task: &mut Pin<&mut IoTask<CallbackData<Ctx>>>,
         ctx: NonNull<Ctx>,
-        allocator: NonNull<Allocator<IoTask<Self>>>,
+        allocator: NonNull<Allocator>,
         address: WindowsAddressKnown,
     ) {
         task.init(Self {
@@ -80,7 +80,7 @@ impl<Ctx: ServersContext<WindowsAddressKnown>> CallbackData<Ctx> {
     fn init_recv(
         task: &mut Pin<&mut IoTask<CallbackData<Ctx>>>,
         ctx: NonNull<Ctx>,
-        allocator: NonNull<Allocator<IoTask<Self>>>,
+        allocator: NonNull<Allocator>,
     ) {
         task.init(Self {
             ctx,

network/windows/src/eventloop/task.rs

@@ -46,3 +46,9 @@ impl<E> IoTask<E> {
         return &mut unsafe { Pin::into_inner_unchecked(NonNull::from_mut(self).read()) }.sys;
     }
 }
+
+impl <E> Drop for IoTask<E> {
+    fn drop(&mut self) {
+        todo!()
+    }
+}