Bug 1471573 - Make SpecialPowers RequestDumpCoverageCounters and RequestResetCoverageCounters async messages that wait on the dumping/resetting to actually happen. r=jmaher

--HG--
extra : rebase_source : 5e7814abb8761cbf5ab44b4c9d2f1c456b2ed912
extra : intermediate-source : e7272b60f48f1e97d557c490eed44404daba4e85
extra : source : eb34fd6b8ce3b9e9fdf8d4610530b7d6ec693765

testing/specialpowers/content/SpecialPowersObserverAPI.js

@@ -11,6 +11,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   ExtensionTestCommon: "resource://testing-common/ExtensionTestCommon.jsm",
   NetUtil: "resource://gre/modules/NetUtil.jsm",
   Services: "resource://gre/modules/Services.jsm",
+  PerTestCoverageUtils: "resource://testing-common/PerTestCoverageUtils.jsm",
 });
 
 this.SpecialPowersError = function(aMsg) {
@@ -554,16 +555,16 @@ SpecialPowersObserverAPI.prototype = {
       }
 
       case "SPRequestDumpCoverageCounters": {
-        let codeCoverage = Cc["@mozilla.org/tools/code-coverage;1"].
-                           getService(Ci.nsICodeCoverage);
-        codeCoverage.dumpCounters();
+        PerTestCoverageUtils.afterTest().then(() =>
+          this._sendReply(aMessage, "SPRequestDumpCoverageCounters", {})
+        );
         return undefined; // See comment at the beginning of this function.
       }
 
       case "SPRequestResetCoverageCounters": {
-        let codeCoverage = Cc["@mozilla.org/tools/code-coverage;1"].
-                           getService(Ci.nsICodeCoverage);
-        codeCoverage.resetCounters();
+        PerTestCoverageUtils.beforeTest().then(() =>
+          this._sendReply(aMessage, "SPRequestResetCoverageCounters", {})
+        );
         return undefined; // See comment at the beginning of this function.
       }
 

testing/specialpowers/content/specialpowers.js

@@ -35,9 +35,7 @@ function SpecialPowers(window) {
                            "SPPrefService",
                            "SPProcessCrashService",
                            "SPSetTestPluginEnabledState",
-                           "SPCleanUpSTSData",
-                           "SPRequestDumpCoverageCounters",
-                           "SPRequestResetCoverageCounters"];
+                           "SPCleanUpSTSData"];
 
   this.SP_ASYNC_MESSAGES = ["SpecialPowers.Focus",
                             "SpecialPowers.Quit",
@@ -48,7 +46,9 @@ function SpecialPowers(window) {
                             "SPProcessCrashManagerWait",
                             "SPStartupExtension",
                             "SPUnloadExtension",
-                            "SPExtensionMessage"];
+                            "SPExtensionMessage",
+                            "SPRequestDumpCoverageCounters",
+                            "SPRequestResetCoverageCounters"];
   addMessageListener("SPPingService", this._messageListener);
   addMessageListener("SpecialPowers.FilesCreated", this._messageListener);
   addMessageListener("SpecialPowers.FilesError", this._messageListener);

testing/specialpowers/content/specialpowersAPI.js

@@ -22,6 +22,9 @@ ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
 ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 ChromeUtils.import("resource://gre/modules/ServiceWorkerCleanUp.jsm");
 
+ChromeUtils.defineModuleGetter(this, "PerTestCoverageUtils",
+  "resource://testing-common/PerTestCoverageUtils.jsm");
+
 // We're loaded with "this" not set to the global in some cases, so we
 // have to play some games to get at the global object here.  Normally
 // we'd try "this" from a function called with undefined this value,
@@ -1982,12 +1985,38 @@ SpecialPowersAPI.prototype = {
     return this._sendSyncMessage("SPCleanUpSTSData", {origin, flags: flags || 0});
   },
 
-  requestDumpCoverageCounters() {
-    this._sendSyncMessage("SPRequestDumpCoverageCounters", {});
+  requestDumpCoverageCounters(cb) {
+    // We want to avoid a roundtrip between child and parent.
+    if (!PerTestCoverageUtils.enabled) {
+      return Promise.resolve();
+    }
+
+    return new Promise(resolve => {
+      let messageListener = _ => {
+        this._removeMessageListener("SPRequestDumpCoverageCounters", messageListener);
+        resolve();
+      };
+
+      this._addMessageListener("SPRequestDumpCoverageCounters", messageListener);
+      this._sendAsyncMessage("SPRequestDumpCoverageCounters", {});
+    });
   },
 
-  requestResetCoverageCounters() {
-    this._sendSyncMessage("SPRequestResetCoverageCounters", {});
+  requestResetCoverageCounters(cb) {
+    // We want to avoid a roundtrip between child and parent.
+    if (!PerTestCoverageUtils.enabled) {
+      return Promise.resolve();
+    }
+
+    return new Promise(resolve => {
+      let messageListener = _ => {
+        this._removeMessageListener("SPRequestResetCoverageCounters", messageListener);
+        resolve();
+      };
+
+      this._addMessageListener("SPRequestResetCoverageCounters", messageListener);
+      this._sendAsyncMessage("SPRequestResetCoverageCounters", {});
+    });
   },
 
   _nextExtensionID: 0,

tools/code-coverage/PerTestCoverageUtils.jsm

@@ -26,8 +26,6 @@ if (gcovResultsPath) {
   gcovResultsDir.initWithPath(gcovResultsPath);
 }
 
-const enabled = !!gcovResultsPath;
-
 function awaitPromise(promise) {
   let ret;
   let complete = false;
@@ -60,7 +58,7 @@ function moveDirectoryContents(src, dst) {
 var PerTestCoverageUtils = class PerTestCoverageUtilsClass {
   // Resets the counters to 0.
   static async beforeTest() {
-    if (!enabled) {
+    if (!PerTestCoverageUtils.enabled) {
       return;
     }
 
@@ -81,7 +79,7 @@ var PerTestCoverageUtils = class PerTestCoverageUtilsClass {
 
   // Dumps counters and moves the gcda files in the directory expected by codecoverage.py.
   static async afterTest() {
-    if (!enabled) {
+    if (!PerTestCoverageUtils.enabled) {
       return;
     }
 
@@ -97,3 +95,5 @@ var PerTestCoverageUtils = class PerTestCoverageUtilsClass {
     awaitPromise(this.afterTest());
   }
 };
+
+PerTestCoverageUtils.enabled = !!gcovResultsPath;

tools/code-coverage/tests/mochitest/test_coverage_specialpowers.html

@@ -14,13 +14,15 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1380659
 
   SimpleTest.waitForExplicitFinish();
 
-  SpecialPowers.requestDumpCoverageCounters();
-  SimpleTest.ok(true, "Counters dumped.");
+  (async function() {
+    await SpecialPowers.requestDumpCoverageCounters();
+    SimpleTest.ok(true, "Counters dumped.");
 
-  SpecialPowers.requestResetCoverageCounters();
-  SimpleTest.ok(true, "Counters reset.");
+    await SpecialPowers.requestResetCoverageCounters();
+    SimpleTest.ok(true, "Counters reset.");
 
-  SimpleTest.finish();
+    SimpleTest.finish();
+  })();
 
   </script>
 </head>