rust 1.79.0 (#820)

since i had to annotate all the `transmute`s for clippy i removed a few
that were not needed.

core/fast_string.rs

@@ -442,7 +442,7 @@ macro_rules! ascii_str {
   ($str:expr) => {{
     const C: $crate::v8::OneByteConst =
       $crate::FastStaticString::create_external_onebyte_const($str.as_bytes());
-    unsafe { std::mem::transmute::<_, $crate::FastStaticString>(&C) }
+    $crate::FastStaticString::new(&C)
   }};
 }
 

core/runtime/bindings.rs

@@ -148,7 +148,10 @@ pub(crate) fn externalize_sources(
     let offset = snapshot_sources.len();
     for (index, source) in sources.into_iter().enumerate() {
       externals[index + offset] =
-        FastStaticString::create_external_onebyte_const(std::mem::transmute(
+        FastStaticString::create_external_onebyte_const(std::mem::transmute::<
+          &[u8],
+          &[u8],
+        >(
           source.code.as_bytes(),
         ));
       let ptr = &externals[index + offset] as *const v8::OneByteConst;

core/runtime/jsrealm.rs

@@ -26,7 +26,6 @@ use std::hash::BuildHasherDefault;
 use std::hash::Hasher;
 use std::rc::Rc;
 use std::sync::Arc;
-use v8::Handle;
 
 pub const CONTEXT_STATE_SLOT_INDEX: i32 = 1;
 pub const MODULE_MAP_SLOT_INDEX: i32 = 2;
@@ -291,10 +290,6 @@ impl JsRealm {
     self.0.context()
   }
 
-  pub(crate) fn context_ptr(&self) -> *mut v8::Context {
-    unsafe { self.0.context.get_unchecked() as *const _ as _ }
-  }
-
   /// Executes traditional JavaScript code (traditional = not ES modules) in the
   /// realm's context.
   ///

core/runtime/jsruntime.rs

@@ -775,9 +775,9 @@ impl JsRuntime {
       )));
 
     let external_refs: &v8::ExternalReferences =
-      isolate_allocations.external_refs.as_ref().unwrap().as_ref();
+      isolate_allocations.external_refs.as_ref().unwrap();
     // SAFETY: We attach external_refs to IsolateAllocations which will live as long as the isolate
-    let external_refs_static = unsafe { std::mem::transmute(external_refs) };
+    let external_refs_static = unsafe { &*(external_refs as *const _) };
 
     let has_snapshot = maybe_startup_snapshot.is_some();
     let mut isolate = setup::create_isolate(
@@ -1068,23 +1068,6 @@ impl JsRuntime {
     self.inner.main_realm.handle_scope(isolate)
   }
 
-  #[inline(always)]
-  /// Create a scope on the stack with the given context
-  fn with_context_scope<'s, T>(
-    isolate: *mut v8::Isolate,
-    context: *mut v8::Context,
-    f: impl FnOnce(&mut v8::HandleScope<'s>) -> T,
-  ) -> T {
-    // SAFETY: We know this isolate is valid and non-null at this time
-    let mut isolate_scope =
-      v8::HandleScope::new(unsafe { isolate.as_mut().unwrap_unchecked() });
-    // SAFETY: We know the context is valid and non-null at this time, and that a Local and pointer share the
-    // same representation
-    let context = unsafe { std::mem::transmute(context) };
-    let mut scope = v8::ContextScope::new(&mut isolate_scope, context);
-    f(&mut scope)
-  }
-
   /// Create a synthetic module - `ext:core/ops` - that exports all ops registered
   /// with the runtime.
   fn execute_virtual_ops_module(
@@ -1726,12 +1709,13 @@ impl JsRuntime {
     cx: &mut Context,
     poll_options: PollEventLoopOptions,
   ) -> Poll<Result<(), Error>> {
-    let isolate = self.v8_isolate_ptr();
-    Self::with_context_scope(
-      isolate,
-      self.inner.main_realm.context_ptr(),
-      move |scope| self.poll_event_loop_inner(cx, scope, poll_options),
-    )
+    // SAFETY: We know this isolate is valid and non-null at this time
+    let mut isolate_scope =
+      v8::HandleScope::new(unsafe { &mut *self.v8_isolate_ptr() });
+    let context =
+      v8::Local::new(&mut isolate_scope, self.inner.main_realm.context());
+    let mut scope = v8::ContextScope::new(&mut isolate_scope, context);
+    self.poll_event_loop_inner(cx, &mut scope, poll_options)
   }
 
   fn poll_event_loop_inner(

core/runtime/op_driver/erased_future.rs

@@ -94,7 +94,10 @@ impl<const MAX_SIZE: usize, Output> ErasedFuture<MAX_SIZE, Output> {
   where
     F: Future<Output = Output>,
   {
-    F::poll(std::mem::transmute(pin), cx)
+    F::poll(
+      std::mem::transmute::<Pin<&mut TypeErased<MAX_SIZE>>, Pin<&mut F>>(pin),
+      cx,
+    )
   }
 
   #[allow(dead_code)]

core/runtime/snapshot.rs

@@ -102,7 +102,9 @@ impl SnapshotStoreDataStore {
     // TODO(mmastrac): v8::Global needs From/Into
     // SAFETY: Because we've tested that Local<Data>: From<Local<T>>, we can assume this is safe.
     unsafe {
-      self.data.push(std::mem::transmute(global));
+      self.data.push(
+        std::mem::transmute::<v8::Global<T>, v8::Global<v8::Data>>(global),
+      );
     }
     id as _
   }

core/tasks.rs

@@ -84,7 +84,8 @@ impl V8TaskSpawnerFactory {
 
     // SAFETY: we are removing the Send trait as we return the tasks here to prevent
     // these tasks from accidentally leaking to another thread.
-    let tasks = unsafe { std::mem::transmute(tasks) };
+    let tasks =
+      unsafe { std::mem::transmute::<Vec<SendTask>, Vec<UnsendTask>>(tasks) };
     Poll::Ready(tasks)
   }
 

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.78.0"
+channel = "1.79.0"
 components = ["rustfmt", "clippy"]

serde_v8/magic/value.rs

@@ -38,7 +38,9 @@ impl ToV8 for Value<'_> {
     _scope: &mut v8::HandleScope<'a>,
   ) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
     // SAFETY: not fully safe, since lifetimes are detached from original scope
-    Ok(unsafe { transmute(self.v8_value) })
+    Ok(unsafe {
+      transmute::<v8::Local<v8::Value>, v8::Local<v8::Value>>(self.v8_value)
+    })
   }
 }