fix hyperlight-guest to avoid clippy warnings about using shared reference to mutable static

Signed-off-by: Simon Davies <[email protected]>

Author: simongdavies

src/hyperlight_guest/src/exceptions/idtr.rs

@@ -26,7 +26,10 @@ pub(crate) unsafe fn load_idt() { unsafe {
 
     let idt_size = 256 * size_of::<IdtEntry>();
     let expected_base = addr_of!(IDT) as *const _ as u64;
-
-    IDTR.init(expected_base, idt_size as u16);
-    IDTR.load();
+    
+    // Use &raw mut to get a mutable raw pointer, then dereference it
+    // this is to avoid the clippy warning "shared reference to mutable static"
+    let idtr = &mut *(&raw mut IDTR);
+    idtr.init(expected_base, idt_size as u16);
+    idtr.load();
 }}

src/hyperlight_guest/src/guest_function_call.rs

@@ -43,8 +43,9 @@ pub(crate) fn call_guest_function(function_call: FunctionCall) -> Result<Vec<u8>
     }
 
     // Find the function definition for the function call.
-    if let Some(registered_function_definition) =
-        unsafe { REGISTERED_GUEST_FUNCTIONS.get(&function_call.function_name) }
+    // Use &raw const to get an immutable reference to the static HashMap
+    // this is to avoid the clippy warning "shared reference to mutable static"
+    if let Some(registered_function_definition) = unsafe { (*(&raw const REGISTERED_GUEST_FUNCTIONS)).get(&function_call.function_name) }
     {
         let function_call_parameter_types: Vec<ParameterType> = function_call
             .parameters

src/tests/rust_guests/simpleguest/src/main.rs

@@ -56,10 +56,15 @@ static mut BIGARRAY: [i32; 1024 * 1024] = [0; 1024 * 1024];
 
 fn set_static(_: &FunctionCall) -> Result<Vec<u8>> {
     unsafe {
-        for val in BIGARRAY.iter_mut() {
+        // Use &raw mut to get a mutable raw pointer, then dereference it
+        // this is to avoid the clippy warning "shared reference to mutable static"
+        let bigarray = &mut *(&raw mut BIGARRAY);
+        for val in bigarray.iter_mut() {
             *val = 1;
         }
-        Ok(get_flatbuffer_result(BIGARRAY.len() as i32))
+        // Use &raw const to get a raw pointer, then dereference it
+        // this is to avoid the clippy warning "shared reference to mutable static"
+        Ok(get_flatbuffer_result((*(&raw const BIGARRAY)).len() as i32))
     }
 }