Implemented LinearMemory trait

lib/api/src/js/export.rs

@@ -7,6 +7,7 @@ use std::fmt;
 use wasm_bindgen::{JsCast, JsValue};
 use wasmer_types::{ExternType, FunctionType, GlobalType, MemoryType, TableType};
 
+/// Represents linear memory that is managed by the javascript runtime
 #[derive(Clone, Debug, PartialEq)]
 pub struct VMMemory {
     pub(crate) memory: Memory,
@@ -20,6 +21,11 @@ impl VMMemory {
     pub(crate) fn new(memory: Memory, ty: MemoryType) -> Self {
         Self { memory, ty }
     }
+
+    /// Attempts to clone this memory (if its clonable)
+    pub(crate) fn try_clone(&self) -> Option<VMMemory> {
+        Some(self.clone())
+    }
 }
 
 #[derive(Clone, Debug, PartialEq)]

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

@@ -6,7 +6,6 @@ use crate::js::{MemoryAccessError, MemoryType};
 use std::marker::PhantomData;
 use std::mem::MaybeUninit;
 use std::slice;
-use thiserror::Error;
 #[cfg(feature = "tracing")]
 use tracing::warn;
 
@@ -16,22 +15,7 @@ use wasmer_types::Pages;
 
 use super::MemoryView;
 
-/// Error type describing things that can go wrong when operating on Wasm Memories.
-#[derive(Error, Debug, Clone, PartialEq, Hash)]
-pub enum MemoryError {
-    /// The operation would cause the size of the memory to exceed the maximum or would cause
-    /// an overflow leading to unindexable memory.
-    #[error("The memory could not grow: current size {} pages, requested increase: {} pages", current.0, attempted_delta.0)]
-    CouldNotGrow {
-        /// The current size in pages.
-        current: Pages,
-        /// The attempted amount to grow by in pages.
-        attempted_delta: Pages,
-    },
-    /// A user defined error value, used for error cases not listed above.
-    #[error("A user-defined error occurred: {0}")]
-    Generic(String),
-}
+pub use wasmer_types::MemoryError;
 
 #[wasm_bindgen]
 extern "C" {
@@ -116,6 +100,17 @@ impl Memory {
         Ok(Self::from_vm_export(store, vm_memory))
     }
 
+    /// Creates a new host `Memory` from provided JavaScript memory.
+    pub fn new_raw(store: &mut impl AsStoreMut, js_memory: js_sys::WebAssembly::Memory, ty: MemoryType) -> Result<Self, MemoryError> {
+        let vm_memory = VMMemory::new(js_memory, ty);
+        Ok(Self::from_vm_export(store, vm_memory))
+    }
+
+    /// Create a memory object from an existing memory and attaches it to the store
+    pub fn new_from_existing(new_store: &mut impl AsStoreMut, memory: VMMemory) -> Self {
+        Self::from_vm_export(new_store, memory)
+    }
+
     /// Returns the [`MemoryType`] of the `Memory`.
     ///
     /// # Example
@@ -210,6 +205,12 @@ impl Memory {
         }
     }
 
+    /// Attempts to clone this memory (if its clonable)
+    pub fn try_clone(&self, store: &impl AsStoreRef) -> Option<VMMemory> {
+        let mem = self.handle.get(store.as_store_ref().objects());
+        mem.try_clone()
+    }
+
     /// Checks whether this `Global` can be used with the given context.
     pub fn is_from_store(&self, store: &impl AsStoreRef) -> bool {
         self.handle.store_id() == store.as_store_ref().objects().id()

lib/api/src/js/function_env.rs

@@ -36,7 +36,7 @@ impl<T> FunctionEnv<T> {
     }
 
     /// Get the data as reference
-    pub fn as_ref<'a>(&self, store: &'a impl AsStoreMut) -> &'a T
+    pub fn as_ref<'a>(&self, store: &'a impl AsStoreRef) -> &'a T
     where
         T: Any + Send + 'static + Sized,
     {
@@ -112,6 +112,11 @@ impl<T: Send + 'static> FunctionEnvMut<'_, T> {
         self.func_env.as_mut(&mut self.store_mut)
     }
 
+    /// Borrows a new immmutable reference
+    pub fn as_ref(&self) -> FunctionEnv<T> {
+        self.func_env.clone()
+    }
+
     /// Borrows a new mutable reference
     pub fn as_mut<'a>(&'a mut self) -> FunctionEnvMut<'a, T> {
         FunctionEnvMut {

lib/api/src/js/imports.rs

@@ -174,6 +174,36 @@ impl Imports {
         }
         imports
     }
+
+    /// Iterates through all the imports in this structure
+    pub fn iter<'a>(&'a self) -> ImportsIterator<'a> {
+        ImportsIterator::new(self)
+    }
+}
+
+pub struct ImportsIterator<'a> {
+    iter: std::collections::hash_map::Iter<'a, (String, String), Extern>
+}
+
+impl<'a> ImportsIterator<'a>
+{
+    fn new(imports: &'a Imports) -> Self {
+        let iter = imports.map.iter();
+        Self { iter }
+    }
+}
+
+impl<'a> Iterator
+for ImportsIterator<'a> {
+    type Item = (&'a str, &'a str, &'a Extern);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter
+            .next()
+            .map(|(k, v)| {
+                (k.0.as_str(), k.1.as_str(), v)
+            })
+    }
 }
 
 impl IntoIterator for &Imports {

lib/api/src/js/mod.rs

@@ -73,6 +73,12 @@ pub use crate::js::types::{
 pub use crate::js::value::Value;
 pub use crate::js::value::Value as Val;
 
+pub mod vm {
+    //! The `vm` module re-exports wasmer-vm types.
+    
+    pub use crate::js::export::VMMemory;
+}
+
 pub use wasmer_types::is_wasm;
 pub use wasmer_types::{
     Bytes, ExportIndex, GlobalInit, LocalFunctionIndex, Pages, ValueType, WASM_MAX_PAGES,

lib/api/src/js/native.rs

@@ -11,7 +11,6 @@ use std::marker::PhantomData;
 
 use crate::js::externals::Function;
 use crate::js::store::{AsStoreMut, AsStoreRef, StoreHandle};
-use crate::js::FunctionEnv;
 use crate::js::{FromToNativeWasmType, RuntimeError, WasmTypeList};
 // use std::panic::{catch_unwind, AssertUnwindSafe};
 use crate::js::export::VMFunction;

lib/api/src/js/store.rs

@@ -263,6 +263,11 @@ mod objects {
             self.id
         }
 
+        /// Sets the ID of this store
+        pub fn set_id(&mut self, id: StoreId) {
+            self.id = id;
+        }
+
         /// Returns a pair of mutable references from two handles.
         ///
         /// Panics if both handles point to the same object.