add table_grow_failed

crates/runtime/src/lib.rs

@@ -90,24 +90,28 @@ pub unsafe trait Store {
         &mut self,
     ) -> (&mut VMExternRefActivationsTable, &dyn ModuleInfoLookup);
 
-    /// Callback invoked to allow the store's resource limiter to reject a memory grow operation.
+    /// Callback invoked to allow the store's resource limiter to reject a
+    /// memory grow operation.
     fn memory_growing(
         &mut self,
         current: usize,
         desired: usize,
         maximum: Option<usize>,
     ) -> Result<bool, Error>;
-    /// Callback invoked to notify the store's resource limiter that a memory grow operation has
-    /// failed.
+    /// Callback invoked to notify the store's resource limiter that a memory
+    /// grow operation has failed.
     fn memory_grow_failed(&mut self, error: &Error);
-    /// Callback invoked to allow the store's resource limiter to reject a table grow operation.
+    /// Callback invoked to allow the store's resource limiter to reject a
+    /// table grow operation.
     fn table_growing(
         &mut self,
         current: u32,
         desired: u32,
         maximum: Option<u32>,
     ) -> Result<bool, Error>;
-
+    /// Callback invoked to notify the store's resource limiter that a table
+    /// grow operation has failed.
+    fn table_grow_failed(&mut self, error: &Error);
     /// Callback invoked whenever fuel runs out by a wasm instance. If an error
     /// is returned that's raised as a trap. Otherwise wasm execution will
     /// continue as normal.

crates/runtime/src/table.rs

@@ -4,8 +4,7 @@
 
 use crate::vmcontext::{VMCallerCheckedAnyfunc, VMTableDefinition};
 use crate::{Store, Trap, VMExternRef};
-use anyhow::Error;
-use anyhow::{bail, Result};
+use anyhow::{bail, format_err, Error, Result};
 use std::convert::{TryFrom, TryInto};
 use std::ops::Range;
 use std::ptr;
@@ -302,6 +301,7 @@ impl Table {
 
         if let Some(max) = self.maximum() {
             if new_size > max {
+                store.table_grow_failed(&format_err!("Table maximum size exceeded"));
                 return Ok(None);
             }
         }

crates/wasmtime/src/limits.rs

@@ -50,6 +50,13 @@ pub trait ResourceLimiter {
     /// effect as the table will not grow.
     fn table_growing(&mut self, current: u32, desired: u32, maximum: Option<u32>) -> bool;
 
+    /// Notifies the resource limiter that growing a linear memory, permitted by
+    /// the `table_growing` method, has failed.
+    ///
+    /// Reasons for failure include: the growth exceeds the `maximum` passed to
+    /// `table_growing`. This could expand in the future.
+    fn table_grow_failed(&mut self, _error: &anyhow::Error) {}
+
     /// The maximum number of instances that can be created for a `Store`.
     ///
     /// Module instantiation will fail if this limit is exceeded.
@@ -79,9 +86,13 @@ pub trait ResourceLimiter {
 }
 
 #[cfg(feature = "async")]
-/// Used by hosts to limit resource consumption of instances.
-/// Identical to [`ResourceLimiter`], except that the `memory_growing` and `table_growing`
+/// Used by hosts to limit resource consumption of instances.  Identical to
+/// [`ResourceLimiter`], except that the `memory_growing` and `table_growing`
 /// functions are async. Must be used with an async [`Store`].
+///
+/// This trait is used with [`Store::limiter_async`]: see those docs for
+/// restrictions on using other Wasmtime interfaces with an async resource
+/// limiter.
 #[async_trait::async_trait]
 pub trait ResourceLimiterAsync {
     /// Async version of [`ResourceLimiter::memory_growing`]
@@ -98,6 +109,9 @@ pub trait ResourceLimiterAsync {
     /// Asynchronous version of [`ResourceLimiter::table_growing`]
     async fn table_growing(&mut self, current: u32, desired: u32, maximum: Option<u32>) -> bool;
 
+    /// Identical to [`ResourceLimiter::table_grow_failed`]
+    fn table_grow_failed(&mut self, _error: &anyhow::Error) {}
+
     /// Identical to [`ResourceLimiter::instances`]`
     fn instances(&self) -> usize {
         DEFAULT_INSTANCE_LIMIT

crates/wasmtime/src/store.rs

@@ -1618,6 +1618,19 @@ unsafe impl<T> wasmtime_runtime::Store for StoreInner<T> {
         }
     }
 
+    fn table_grow_failed(&mut self, error: &anyhow::Error) {
+        match self.limiter {
+            Some(ResourceLimiterInner::Sync(ref mut limiter)) => {
+                limiter(&mut self.data).table_grow_failed(error)
+            }
+            #[cfg(feature = "async")]
+            Some(ResourceLimiterInner::Async(ref mut limiter)) => {
+                limiter(&mut self.data).table_grow_failed(error)
+            }
+            None => {}
+        }
+    }
+
     fn out_of_gas(&mut self) -> Result<(), anyhow::Error> {
         return match &mut self.out_of_gas_behavior {
             OutOfGas::Trap => Err(anyhow::Error::new(OutOfGasError)),