Bug 981258 - Set the breakpoints in browser_dbg_breakpoints-break-on-last-line-of-script-on-reload.js before executng the IIFE so that the IIFE's Debugger.Script can't be GC'd before the breakpoints are set; r=past

browser/devtools/debugger/test/browser_dbg_breakpoints-break-on-last-line-of-script-on-reload.js

@@ -23,15 +23,20 @@ function test() {
     Task.spawn(function* () {
       try {
 
-        yield ensureSourceIs(gPanel, CODE_URL, true);
+        // Refresh and hit the debugger statement before the location we want to
+        // set our breakpoints. We have to pause before the breakpoint locations
+        // so that GC doesn't get a chance to kick in and collect the IIFE's
+        // script, which would causes us to receive a 'noScript' error from the
+        // server when we try to set the breakpoints.
+        const [paused, ] = yield promise.all([
+          waitForThreadEvents(gPanel, "paused"),
+          reloadActiveTab(gPanel, gEvents.SOURCE_SHOWN),
+        ]);
 
-        // Pause and set our breakpoints.
-        yield doInterrupt();
+        is(paused.why.type, "debuggerStatement");
+
+        // Set our breakpoints.
         const [bp1, bp2, bp3] = yield promise.all([
-          setBreakpoint({
-            url: CODE_URL,
-            line: 2
-          }),
           setBreakpoint({
             url: CODE_URL,
             line: 3
@@ -39,23 +44,31 @@ function test() {
           setBreakpoint({
             url: CODE_URL,
             line: 4
+          }),
+          setBreakpoint({
+            url: CODE_URL,
+            line: 5
           })
         ]);
 
-        // Should hit the first breakpoint on reload.
+        // Refresh and hit the debugger statement again.
         yield promise.all([
           reloadActiveTab(gPanel, gEvents.SOURCE_SHOWN),
-          waitForCaretUpdated(gPanel, 2)
+          waitForCaretAndScopes(gPanel, 1)
         ]);
 
-        // And should hit the other breakpoints as we resume.
+        // And we should hit the breakpoints as we resume.
         yield promise.all([
           doResume(),
-          waitForCaretUpdated(gPanel, 3)
+          waitForCaretAndScopes(gPanel, 3)
         ]);
         yield promise.all([
           doResume(),
-          waitForCaretUpdated(gPanel, 4)
+          waitForCaretAndScopes(gPanel, 4)
+        ]);
+        yield promise.all([
+          doResume(),
+          waitForCaretAndScopes(gPanel, 5)
         ]);
 
         // Clean up the breakpoints.

browser/devtools/debugger/test/code_breakpoints-break-on-last-line-of-script-on-reload.js

@@ -1,3 +1,4 @@
+debugger;
 var a = (function(){
   var b = 9;
   console.log("x", b);

toolkit/devtools/server/actors/script.js

@@ -1362,7 +1362,13 @@ ThreadActor.prototype = {
       if (line == null ||
           line < 0 ||
           this.dbg.findScripts({ url: url }).length == 0) {
-        return { error: "noScript" };
+        return {
+          error: "noScript",
+          message: "Requested setting a breakpoint on "
+            + url + ":" + line
+            + (column != null ? ":" + column : "")
+            + " but there is no Debugger.Script at that location"
+        };
       }
 
       let response = this._createAndStoreBreakpoint({
@@ -1450,6 +1456,10 @@ ThreadActor.prototype = {
     if (scripts.length == 0) {
       return {
         error: "noScript",
+        message: "Requested setting a breakpoint on "
+          + aLocation.url + ":" + aLocation.line
+          + (aLocation.column != null ? ":" + aLocation.column : "")
+          + " but there is no Debugger.Script at that location",
         actor: actor.actorID
       };
     }