Support getting/setting metering points and internal fields with a Ctx.

lib/middleware-common/src/metering.rs

@@ -1,7 +1,7 @@
 use wasmer_runtime_core::{
     codegen::{Event, EventSink, FunctionMiddleware, InternalEvent},
     module::ModuleInfo,
-    vm::InternalField,
+    vm::{Ctx, InternalField},
     wasmparser::{Operator, Type as WpType},
     Instance,
 };
@@ -111,16 +111,26 @@ impl FunctionMiddleware for Metering {
     }
 }
 
-/// Returns the number of points used by a function call for metering
+/// Returns the number of points used by an Instance.
 pub fn get_points_used(instance: &Instance) -> u64 {
     instance.get_internal(&INTERNAL_FIELD)
 }
 
-/// Sets the value of points used
+/// Sets the number of points used by an Instance.
 pub fn set_points_used(instance: &mut Instance, value: u64) {
     instance.set_internal(&INTERNAL_FIELD, value);
 }
 
+/// Returns the number of points used in a Ctx.
+pub fn get_points_used_ctx(ctx: &Ctx) -> u64 {
+    ctx.get_internal(&INTERNAL_FIELD)
+}
+
+/// Sets the number of points used in a Ctx.
+pub fn set_points_used_ctx(ctx: &mut Ctx, value: u64) {
+    ctx.set_internal(&INTERNAL_FIELD, value);
+}
+
 #[cfg(all(test, feature = "singlepass"))]
 mod tests {
     use super::*;

lib/runtime-core/src/vm.rs

@@ -350,6 +350,18 @@ impl Ctx {
     pub fn dynamic_sigindice_count(&self) -> usize {
         unsafe { (*self.local_backing).dynamic_sigindices.len() }
     }
+
+    /// Returns the value of the specified internal field.
+    pub fn get_internal(&self, field: &InternalField) -> u64 {
+        unsafe { (*self.internal.internals)[field.index()] }
+    }
+
+    /// Writes the value to the specified internal field.
+    pub fn set_internal(&mut self, field: &InternalField, value: u64) {
+        unsafe {
+            (*self.internal.internals)[field.index()] = value;
+        }
+    }
 }
 
 #[doc(hidden)]