Bug 1492265 - Use a content process target actor for xpcshell debugging r=jdescottes on a CLOSED TREE

MozReview-Commit-ID: J9XTgC0EBPG

Depends on D7415

Differential Revision: https://phabricator.services.mozilla.com/D7416

--HG--
extra : source : 9259cfe05c4ecd43d5e8ca354fa14ba4b96a6ae3
extra : histedit_source : 25c98064b79fd9c132ad19c874b7a535e8742dc2

devtools/client/framework/target.js

@@ -229,8 +229,10 @@ function TabTarget({ form, client, chrome, tab = null }) {
   } else {
     // browser content toolbox's form will be of the form:
     //   server0.conn0.content-process0/contentProcessTarget7
+    // while xpcshell debugging will be:
+    //   server1.conn0.contentProcessTarget7
     const isContentProcessTarget =
-      this._form.actor.match(/conn\d+\.content-process\d+\/contentProcessTarget\d+/);
+      this._form.actor.match(/conn\d+\.(content-process\d+\/)?contentProcessTarget\d+/);
     this._isBrowsingContext = !this.isLegacyAddon && !isContentProcessTarget;
   }
 

devtools/server/actors/root.js

@@ -14,6 +14,10 @@ const { DebuggerServer } = require("devtools/server/main");
 
 loader.lazyRequireGetter(this, "ChromeWindowTargetActor",
   "devtools/server/actors/targets/chrome-window", true);
+loader.lazyRequireGetter(this, "ContentProcessTargetActor",
+  "devtools/server/actors/targets/content-process", true);
+loader.lazyRequireGetter(this, "ParentProcessTargetActor",
+  "devtools/server/actors/targets/parent-process", true);
 
 /* Root actor for the remote debugging protocol. */
 
@@ -521,16 +525,30 @@ RootActor.prototype = {
     // If the request doesn't contains id parameter or id is 0
     // (id == 0, based on onListProcesses implementation)
     if ((!("id" in request)) || request.id === 0) {
-      if (this._parentProcessTargetActor && (!this._parentProcessTargetActor.docShell ||
-          this._parentProcessTargetActor.docShell.isBeingDestroyed)) {
+      // Check if we are running on xpcshell. hiddenDOMWindow is going to throw on it.
+      // When running on xpcshell, there is no valid browsing context to attach to
+      // and so ParentProcessTargetActor doesn't make sense as it inherits from
+      // BrowsingContextTargetActor. So instead use ContentProcessTargetActor, which
+      // matches xpcshell needs.
+      let isXpcshell = true;
+      try {
+        isXpcshell = !Services.wm.getMostRecentWindow(null) &&
+                     !Services.appShell.hiddenDOMWindow;
+      } catch (e) {}
+
+      if (!isXpcshell && this._parentProcessTargetActor &&
+          (!this._parentProcessTargetActor.docShell ||
+            this._parentProcessTargetActor.docShell.isBeingDestroyed)) {
         this._parentProcessTargetActor.destroy();
         this._parentProcessTargetActor = null;
       }
       if (!this._parentProcessTargetActor) {
-        // Create a ParentProcessTargetActor for the parent process
-        const { ParentProcessTargetActor } =
-          require("devtools/server/actors/targets/parent-process");
-        this._parentProcessTargetActor = new ParentProcessTargetActor(this.conn);
+        // Create the target actor for the parent process
+        if (isXpcshell) {
+          this._parentProcessTargetActor = new ContentProcessTargetActor(this.conn);
+        } else {
+          this._parentProcessTargetActor = new ParentProcessTargetActor(this.conn);
+        }
         this._globalActorPool.manage(this._parentProcessTargetActor);
       }
 

devtools/server/tests/unit/test_xpcshell_debugging.js

@@ -28,9 +28,8 @@ add_task(async function() {
   // Even though we have no tabs, getProcess gives us the chromeDebugger.
   const response = await client.getProcess();
 
-  const actor = response.form.actor;
-  const [, tabClient] = await client.attachTarget(actor);
-  const [, threadClient] = await tabClient.attachThread(null);
+  const { chromeDebugger } = response.form;
+  const [, threadClient] = await client.attachThread(chromeDebugger);
   const onResumed = new Promise(resolve => {
     threadClient.addOneTimeListener("paused", (event, packet) => {
       equal(packet.why.type, "breakpoint",