Fix clippy lints

Fixes: wasmerio#2926

CHANGELOG.md

@@ -8,6 +8,8 @@ Looking for changes that affect our C API? See the [C API Changelog](lib/c-api/C
 
 ## **Unreleased**
 
+### Fixed
+- [#2942](https://github.com/wasmerio/wasmer/pull/2942) Fix clippy lints.
 
 ## 2.3.0 - 2022/06/06
 

Makefile

@@ -745,11 +745,11 @@ install-wasmer-headless-minimal:
 update-testsuite:
 	git subtree pull --prefix tests/wast/spec https://github.com/WebAssembly/testsuite.git master --squash
 
-lint-packages: RUSTFLAGS += -D dead-code -D nonstandard-style -D unused-imports -D unused-mut -D unused-variables -D unused-unsafe -D unreachable-patterns -D bad-style -D improper-ctypes -D unused-allocation -D unused-comparisons -D while-true -D unconditional-recursion -D bare-trait-objects # TODO: add `-D missing-docs` # TODO: add `-D function_item_references` (not available on Rust 1.47, try when upgrading)
+lint-packages: RUSTFLAGS += -D dead-code -D nonstandard-style -D unused-imports -D unused-mut -D unused-variables -D unused-unsafe -D unreachable-patterns -D bad-style -D improper-ctypes -D unused-allocation -D unused-comparisons -D while-true -D unconditional-recursion -D bare-trait-objects -D function_item_references # TODO: add `-D missing-docs`
 lint-packages:
-	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --all $(exclude_tests)
-	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --manifest-path lib/cli/Cargo.toml $(compiler_features)
-	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --manifest-path fuzz/Cargo.toml $(compiler_features)
+	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --all -- -D clippy::all
+	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --manifest-path lib/cli/Cargo.toml $(compiler_features) -- -D clippy::all
+	RUSTFLAGS="${RUSTFLAGS}" cargo clippy --manifest-path fuzz/Cargo.toml $(compiler_features) -- -D clippy::all
 
 lint-formatting:
 	cargo fmt --all -- --check

lib/api/src/js/ptr.rs

@@ -145,8 +145,7 @@ impl<T, M: MemorySize> WasmPtr<T, M> {
     ///
     /// This method returns an error if an address overflow occurs.
     #[inline]
-    #[must_use]
-    pub fn add(self, offset: M::Offset) -> Result<Self, MemoryAccessError> {
+    pub fn add_offset(self, offset: M::Offset) -> Result<Self, MemoryAccessError> {
         let base = self.offset.into();
         let index = offset.into();
         let offset = index
@@ -164,8 +163,7 @@ impl<T, M: MemorySize> WasmPtr<T, M> {
     ///
     /// This method returns an error if an address overflow occurs.
     #[inline]
-    #[must_use]
-    pub fn sub(self, offset: M::Offset) -> Result<Self, MemoryAccessError> {
+    pub fn sub_offset(self, offset: M::Offset) -> Result<Self, MemoryAccessError> {
         let base = self.offset.into();
         let index = offset.into();
         let offset = index
@@ -226,7 +224,7 @@ impl<T: ValueType, M: MemorySize> WasmPtr<T, M> {
         let mut vec = Vec::new();
         for i in 0u64.. {
             let i = M::Offset::try_from(i).map_err(|_| MemoryAccessError::Overflow)?;
-            let val = self.add(i)?.deref(memory).read()?;
+            let val = self.add_offset(i)?.deref(memory).read()?;
             if end(&val) {
                 break;
             }

lib/api/src/lib.rs

@@ -6,12 +6,12 @@
     missing_docs,
     trivial_numeric_casts,
     unused_extern_crates,
-    broken_intra_doc_links
+    rustdoc::broken_intra_doc_links
 )]
 #![warn(unused_import_braces)]
 #![cfg_attr(
     feature = "cargo-clippy",
-    allow(clippy::new_without_default, vtable_address_comparisons)
+    allow(clippy::new_without_default, clippy::vtable_address_comparisons)
 )]
 #![cfg_attr(
     feature = "cargo-clippy",

lib/api/src/sys/exports.rs

@@ -170,7 +170,7 @@ impl Exports {
         T: ExportableWithGenerics<'a, Args, Rets>,
     {
         let mut out: T = self.get_with_generics(name)?;
-        out.into_weak_instance_ref();
+        out.convert_to_weak_instance_ref();
         Ok(out)
     }
 
@@ -279,7 +279,7 @@ impl IntoIterator for Exports {
     type Item = (String, Extern);
 
     fn into_iter(self) -> Self::IntoIter {
-        self.map.clone().into_iter()
+        self.map.into_iter()
     }
 }
 
@@ -311,7 +311,7 @@ pub trait Exportable<'a>: Sized {
     /// Convert the extern internally to hold a weak reference to the `InstanceRef`.
     /// This is useful for preventing cycles, for example for data stored in a
     /// type implementing `WasmerEnv`.
-    fn into_weak_instance_ref(&mut self);
+    fn convert_to_weak_instance_ref(&mut self);
 }
 
 /// A trait for accessing exports (like [`Exportable`]) but it takes generic
@@ -323,7 +323,7 @@ pub trait ExportableWithGenerics<'a, Args: WasmTypeList, Rets: WasmTypeList>: Si
     /// Convert the extern internally to hold a weak reference to the `InstanceRef`.
     /// This is useful for preventing cycles, for example for data stored in a
     /// type implementing `WasmerEnv`.
-    fn into_weak_instance_ref(&mut self);
+    fn convert_to_weak_instance_ref(&mut self);
 }
 
 /// We implement it for all concrete [`Exportable`] types (that are `Clone`)
@@ -333,7 +333,7 @@ impl<'a, T: Exportable<'a> + Clone + 'static> ExportableWithGenerics<'a, (), ()>
         T::get_self_from_extern(_extern).map(|i| i.clone())
     }
 
-    fn into_weak_instance_ref(&mut self) {
-        <Self as Exportable>::into_weak_instance_ref(self);
+    fn convert_to_weak_instance_ref(&mut self) {
+        <Self as Exportable>::convert_to_weak_instance_ref(self);
     }
 }

lib/api/src/sys/externals/function.rs

@@ -45,8 +45,7 @@ pub struct Function {
 impl wasmer_types::WasmValueType for Function {
     /// Write the value.
     unsafe fn write_value_to(&self, p: *mut i128) {
-        let func_ref =
-            Val::into_vm_funcref(&Val::FuncRef(Some(self.clone())), &self.store).unwrap();
+        let func_ref = Val::into_vm_funcref(Val::FuncRef(Some(self.clone())), &self.store).unwrap();
         std::ptr::write(p as *mut VMFuncRef, func_ref);
     }
 
@@ -533,7 +532,7 @@ impl Function {
             VMFunctionKind::Dynamic => unsafe {
                 type VMContextWithEnv = VMDynamicFunctionContext<DynamicFunction<std::ffi::c_void>>;
                 let ctx = self.exported.vm_function.vmctx.host_env as *mut VMContextWithEnv;
-                Ok((*ctx).ctx.call(&params)?.into_boxed_slice())
+                Ok((*ctx).ctx.call(params)?.into_boxed_slice())
             },
             VMFunctionKind::Static => {
                 unimplemented!(
@@ -704,12 +703,10 @@ impl<'a> Exportable<'a> for Function {
         }
     }
 
-    fn into_weak_instance_ref(&mut self) {
-        self.exported
-            .vm_function
-            .instance_ref
-            .as_mut()
-            .map(|v| *v = v.downgrade());
+    fn convert_to_weak_instance_ref(&mut self) {
+        if let Some(v) = self.exported.vm_function.instance_ref.as_mut() {
+            *v = v.downgrade();
+        }
     }
 }
 
@@ -768,7 +765,7 @@ where
     Env: Sized + 'static + Send + Sync,
 {
     fn call(&self, args: &[Val]) -> Result<Vec<Val>, RuntimeError> {
-        (*self.func)(&*self.env, &args)
+        (*self.func)(&*self.env, args)
     }
     fn function_type(&self) -> &FunctionType {
         &self.function_type
@@ -864,6 +861,10 @@ mod inner {
     /// `FromNativeWasmType` and `ToNativeWasmType` but it creates a
     /// non-negligible complexity in the `WasmTypeList`
     /// implementation.
+    ///
+    /// # Safety
+    /// This trait is unsafe given the nature of how values are written and read from the native
+    /// stack
     pub unsafe trait FromToNativeWasmType
     where
         Self: Sized,
@@ -1219,6 +1220,7 @@ mod inner {
 
                 type Array = [i128; count_idents!( $( $x ),* )];
 
+                #[allow(clippy::unused_unit)]
                 fn from_array(array: Self::Array) -> Self {
                     // Unpack items of the array.
                     #[allow(non_snake_case)]
@@ -1254,6 +1256,7 @@ mod inner {
                     [0; count_idents!( $( $x ),* )]
                 }
 
+                #[allow(clippy::unused_unit)]
                 fn from_c_struct(c_struct: Self::CStruct) -> Self {
                     // Unpack items of the C structure.
                     #[allow(non_snake_case)]

lib/api/src/sys/externals/global.rs

@@ -254,10 +254,9 @@ impl<'a> Exportable<'a> for Global {
         }
     }
 
-    fn into_weak_instance_ref(&mut self) {
-        self.vm_global
-            .instance_ref
-            .as_mut()
-            .map(|v| *v = v.downgrade());
+    fn convert_to_weak_instance_ref(&mut self) {
+        if let Some(v) = self.vm_global.instance_ref.as_mut() {
+            *v = v.downgrade();
+        }
     }
 }

lib/api/src/sys/externals/memory.rs

@@ -215,7 +215,7 @@ impl Memory {
             .checked_add(buf.len() as u64)
             .ok_or(MemoryAccessError::Overflow)?;
         if end > def.current_length.try_into().unwrap() {
-            Err(MemoryAccessError::HeapOutOfBounds)?;
+            return Err(MemoryAccessError::HeapOutOfBounds);
         }
         unsafe {
             volatile_memcpy_read(def.base.add(offset as usize), buf.as_mut_ptr(), buf.len());
@@ -245,7 +245,7 @@ impl Memory {
             .checked_add(buf.len() as u64)
             .ok_or(MemoryAccessError::Overflow)?;
         if end > def.current_length.try_into().unwrap() {
-            Err(MemoryAccessError::HeapOutOfBounds)?;
+            return Err(MemoryAccessError::HeapOutOfBounds);
         }
         let buf_ptr = buf.as_mut_ptr() as *mut u8;
         unsafe {
@@ -269,7 +269,7 @@ impl Memory {
             .checked_add(data.len() as u64)
             .ok_or(MemoryAccessError::Overflow)?;
         if end > def.current_length.try_into().unwrap() {
-            Err(MemoryAccessError::HeapOutOfBounds)?;
+            return Err(MemoryAccessError::HeapOutOfBounds);
         }
         unsafe {
             volatile_memcpy_write(data.as_ptr(), def.base.add(offset as usize), data.len());
@@ -302,11 +302,10 @@ impl<'a> Exportable<'a> for Memory {
         }
     }
 
-    fn into_weak_instance_ref(&mut self) {
-        self.vm_memory
-            .instance_ref
-            .as_mut()
-            .map(|v| *v = v.downgrade());
+    fn convert_to_weak_instance_ref(&mut self) {
+        if let Some(v) = self.vm_memory.instance_ref.as_mut() {
+            *v = v.downgrade();
+        }
     }
 }
 

lib/api/src/sys/externals/mod.rs

@@ -70,12 +70,12 @@ impl<'a> Exportable<'a> for Extern {
         Ok(_extern)
     }
 
-    fn into_weak_instance_ref(&mut self) {
+    fn convert_to_weak_instance_ref(&mut self) {
         match self {
-            Self::Function(f) => f.into_weak_instance_ref(),
-            Self::Global(g) => g.into_weak_instance_ref(),
-            Self::Memory(m) => m.into_weak_instance_ref(),
-            Self::Table(t) => t.into_weak_instance_ref(),
+            Self::Function(f) => f.convert_to_weak_instance_ref(),
+            Self::Global(g) => g.convert_to_weak_instance_ref(),
+            Self::Memory(m) => m.convert_to_weak_instance_ref(),
+            Self::Table(t) => t.convert_to_weak_instance_ref(),
         }
     }
 }

lib/api/src/sys/externals/table.rs

@@ -182,10 +182,9 @@ impl<'a> Exportable<'a> for Table {
         }
     }
 
-    fn into_weak_instance_ref(&mut self) {
-        self.vm_table
-            .instance_ref
-            .as_mut()
-            .map(|v| *v = v.downgrade());
+    fn convert_to_weak_instance_ref(&mut self) {
+        if let Some(v) = self.vm_table.instance_ref.as_mut() {
+            *v = v.downgrade();
+        }
     }
 }

lib/api/src/sys/instance.rs

@@ -168,7 +168,7 @@ impl Instance {
     ///  * Runtime errors that happen when running the module `start` function.
     pub fn new_by_index(module: &Module, externs: &[Extern]) -> Result<Self, InstantiationError> {
         let store = module.store();
-        let imports = externs.iter().cloned().collect::<Vec<_>>();
+        let imports = externs.to_vec();
         let handle = module.instantiate(&imports)?;
         let exports = module
             .exports()

lib/api/src/sys/mem_access.rs

@@ -29,12 +29,12 @@ pub enum MemoryAccessError {
 
 impl From<MemoryAccessError> for RuntimeError {
     fn from(err: MemoryAccessError) -> Self {
-        RuntimeError::new(err.to_string())
+        Self::new(err.to_string())
     }
 }
 impl From<FromUtf8Error> for MemoryAccessError {
     fn from(_err: FromUtf8Error) -> Self {
-        MemoryAccessError::NonUtf8String
+        Self::NonUtf8String
     }
 }
 
@@ -191,6 +191,12 @@ impl<'a, T: ValueType> WasmSlice<'a, T> {
         self.len
     }
 
+    /// Returns `true` if the number of elements is 0.
+    #[inline]
+    pub fn is_empty(self) -> bool {
+        self.len == 0
+    }
+
     /// Get a reference to the Wasm memory backing this reference.
     #[inline]
     pub fn memory(self) -> &'a Memory {
@@ -343,7 +349,7 @@ impl<'a, T: ValueType> Iterator for WasmSliceIter<'a, T> {
     type Item = WasmRef<'a, T>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if self.slice.len() != 0 {
+        if !self.slice.is_empty() {
             let elem = self.slice.index(0);
             self.slice = self.slice.subslice(1..self.slice.len());
             Some(elem)
@@ -359,7 +365,7 @@ impl<'a, T: ValueType> Iterator for WasmSliceIter<'a, T> {
 
 impl<'a, T: ValueType> DoubleEndedIterator for WasmSliceIter<'a, T> {
     fn next_back(&mut self) -> Option<Self::Item> {
-        if self.slice.len() != 0 {
+        if !self.slice.is_empty() {
             let elem = self.slice.index(self.slice.len() - 1);
             self.slice = self.slice.subslice(0..self.slice.len() - 1);
             Some(elem)

lib/api/src/sys/module.rs

@@ -345,11 +345,10 @@ impl Module {
     pub fn set_name(&mut self, name: &str) -> bool {
         Arc::get_mut(&mut self.artifact)
             .and_then(|artifact| artifact.module_mut())
-            .map(|mut module_info| {
+            .map_or(false, |mut module_info| {
                 module_info.name = Some(name.to_string());
                 true
             })
-            .unwrap_or(false)
     }
 
     /// Returns an iterator over the imported types in the Module.
@@ -376,7 +375,7 @@ impl Module {
     /// # Ok(())
     /// # }
     /// ```
-    pub fn imports<'a>(&'a self) -> ImportsIterator<impl Iterator<Item = ImportType> + 'a> {
+    pub fn imports(&self) -> ImportsIterator<impl Iterator<Item = ImportType> + '_> {
         self.artifact.module_ref().imports()
     }
 
@@ -403,7 +402,7 @@ impl Module {
     /// # Ok(())
     /// # }
     /// ```
-    pub fn exports<'a>(&'a self) -> ExportsIterator<impl Iterator<Item = ExportType> + 'a> {
+    pub fn exports(&self) -> ExportsIterator<impl Iterator<Item = ExportType> + '_> {
         self.artifact.module_ref().exports()
     }
 
@@ -430,7 +429,7 @@ impl Module {
     /// However, the usage is highly discouraged.
     #[doc(hidden)]
     pub fn info(&self) -> &ModuleInfo {
-        &self.artifact.module_ref()
+        self.artifact.module_ref()
     }
 
     /// Gets the [`Artifact`] used internally by the Module.

lib/api/src/sys/native.rs

@@ -132,6 +132,7 @@ macro_rules! impl_native_traits {
             Rets: WasmTypeList,
         {
             /// Call the typed func and return results.
+            #[allow(clippy::too_many_arguments)]
             pub fn call(&self, $( $x: $x, )* ) -> Result<Rets, RuntimeError> {
                 if !self.is_host() {
                     // We assume the trampoline is always going to be present for
@@ -233,7 +234,7 @@ macro_rules! impl_native_traits {
                 crate::Function::get_self_from_extern(_extern)?.native().map_err(|_| crate::sys::exports::ExportError::IncompatibleType)
             }
 
-            fn into_weak_instance_ref(&mut self) {
+            fn convert_to_weak_instance_ref(&mut self) {
                 self.exported.vm_function.instance_ref.as_mut().map(|v| *v = v.downgrade());
             }
         }