fix: rename crankStats -> meterUsage

Author: michaelfig

packages/SwingSet/src/kernel/vatManager/manager-subprocess-xsnap.js

@@ -170,12 +170,12 @@ export function makeXsSubprocessFactory({
       parentLog(vatID, `deliverDone`, result.reply[0], result.reply.length);
       transcriptManager.finishDispatch();
 
-      // Attach the crank stats to the deliver result.
+      // Attach the meterUsage to the deliver result.
       /** @type {Tagged} */
       const deliverResult = [
         result.reply[0], // 'ok' or 'error'
         result.reply[1] || null, // problem or null
-        result.crankStats || null, // meter usage statistics or null
+        result.meterUsage || null, // meter usage statistics or null
       ];
       return harden(deliverResult);
     }

packages/SwingSet/src/kernel/vatManager/types.js

@@ -1,6 +1,6 @@
 /**
  * @typedef { [unknown, ...unknown[]] } Tagged
  * @typedef { { meterType: string, allocate: number|null, compute: number|null } }
- * CrankStats
- * @typedef { { reply: Tagged, crankStats: CrankStats } } CrankResults
+ * MeterUsage
+ * @typedef { { reply: Tagged, meterUsage: MeterUsage } } CrankResults
  */

packages/xsnap/src/xsnap.js

@@ -122,7 +122,7 @@ export function xsnap(options) {
    * @template T
    * @typedef {Object} RunResult
    * @property {T} reply
-   * @property {{ meterType: string, allocate: number|null, compute: number|null }} crankStats
+   * @property {{ meterType: string, allocate: number|null, compute: number|null }} meterUsage
    */
 
   /**
@@ -150,17 +150,17 @@ export function xsnap(options) {
           // For now it is just a number for the used compute meter.
           compute = JSON.parse(decoder.decode(meterData));
         }
-        const crankStats = {
+        const meterUsage = {
           // The version identifier for our meter type.
           // TODO Bump this whenever there's a change to metering semantics.
           meterType: 'xs-meter-1',
           allocate: null, // No allocation meter yet.
           compute,
         };
-        // console.log('have crankStats', crankStats);
+        // console.log('have meterUsage', meterUsage);
         return {
           reply: message.subarray(meterSeparator < 0 ? 1 : meterSeparator + 1),
-          crankStats,
+          meterUsage,
         };
       } else if (message[0] === ERROR) {
         throw new Error(