1 files changed, 173 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/job-queue-03.js b/js/src/jit-test/tests/debug/job-queue-03.js
new file mode 100644
index 0000000000..7e3ce27ea4
--- /dev/null
+++ b/js/src/jit-test/tests/debug/job-queue-03.js
@@ -0,0 +1,173 @@
+// Multiple debuggers get their job queues drained after each hook.
+// This covers:
+// - onDebuggerStatement
+// - onStep
+// - onEnterFrame
+// - onPop
+// - onExceptionUnwind
+// - breakpoint handlers
+// - uncaughtExceptionHook
+
+const g = newGlobal({ newCompartment: true });
+g.parent = this;
+
+var log = '';
+let expected_throws = 0;
+
+function setup(global, label) {
+  const dbg = new Debugger;
+  dbg.gDO = dbg.addDebuggee(global);
+  dbg.log = '';
+
+  dbg.onDebuggerStatement = function (frame) {
+    // Exercise the promise machinery: resolve a promise and perform a microtask
+    // checkpoint. When called from a debugger hook, the debuggee's microtasks
+    // should not run.
+    function exercise(name) {
+      dbg.log += name + ',';
+      log += `${label}-${name}-handler\n`;
+      Promise.resolve(42).then(v => {
+        assertEq(v, 42);
+        log += `${label}-${name}-tail\n`;
+      });
+    }
+
+    exercise('debugger');
+
+    frame.onStep = function () {
+      this.onStep = undefined;
+      exercise('step');
+    };
+
+    dbg.onEnterFrame = function (frame) {
+      dbg.onEnterFrame = undefined;
+      frame.onPop = function(completion) {
+        assertEq(completion.return, 'escutcheon');
+        exercise('pop');
+      }
+
+      exercise('enter');
+    }
+
+    expected_throws++;
+    dbg.onExceptionUnwind = function(frame, value) {
+      dbg.onExceptionUnwind = undefined;
+      assertEq(value, 'myrmidon');
+      exercise('exception');
+      if (--expected_throws > 0) {
+        return undefined;
+      } else {
+        return { return: 'escutcheon' };
+      }
+    };
+
+    // Set a breakpoint on entry to g.breakpoint_here.
+    const script = dbg.gDO.getOwnPropertyDescriptor('breakpoint_here').value.script;
+    const handler = {
+      hit(frame) {
+        script.clearAllBreakpoints();
+        exercise('bp');
+      }
+    };
+    script.setBreakpoint(0, handler);
+
+    dbg.uncaughtExceptionHook = function (ex) {
+      assertEq(ex, 'turncoat');
+      exercise('uncaught');
+    };
+
+    // Throw an uncaught exception from the Debugger handler. This should reach
+    // uncaughtExceptionHook, but shouldn't affect the debuggee.
+    throw 'turncoat';
+  };
+
+  return dbg;
+}
+
+const dbg1 = setup(g, '1');
+const dbg2 = setup(g, '2');
+const dbg3 = setup(g, '3');
+
+g.eval(`
+  function breakpoint_here() {
+    throw 'myrmidon';
+  }
+
+  parent.log += 'eval-start\\n';
+
+  // DebuggeeWouldRun detection may prevent this callback from running at all if
+  // bug 1145201 is present. SpiderMonkey will try to run the promise reaction
+  // job from the Debugger hook's microtask checkpoint, triggering
+  // DebuggeeWouldRun. This is a little difficult to observe, since the callback
+  // never even begins execution. But it should cause the 'then' promise to be
+  // rejected, which the shell will report (if the assertEq(log, ...) doesn't
+  // kill the test first).
+
+  Promise.resolve(84).then(function(v) {
+    assertEq(v, 84);
+    parent.log += 'eval-react';
+  });
+  debugger;
+  parent.log += 'stuff to step over\\n';
+  breakpoint_here();
+  parent.log += 'eval-end\\n';
+`);
+
+log += 'main-drain\n'
+drainJobQueue();
+log += 'main-drain-done\n';
+
+const regex = new RegExp(`eval-start
+.-debugger-handler
+.-uncaught-handler
+.-debugger-tail
+.-uncaught-tail
+.-debugger-handler
+.-uncaught-handler
+.-debugger-tail
+.-uncaught-tail
+.-debugger-handler
+.-uncaught-handler
+.-debugger-tail
+.-uncaught-tail
+.-step-handler
+.-step-tail
+.-step-handler
+.-step-tail
+.-step-handler
+.-step-tail
+stuff to step over
+.-enter-handler
+.-enter-tail
+.-enter-handler
+.-enter-tail
+.-enter-handler
+.-enter-tail
+.-bp-handler
+.-bp-tail
+.-bp-handler
+.-bp-tail
+.-bp-handler
+.-bp-tail
+.-exception-handler
+.-exception-tail
+.-exception-handler
+.-exception-tail
+.-exception-handler
+.-exception-tail
+.-pop-handler
+.-pop-tail
+.-pop-handler
+.-pop-tail
+.-pop-handler
+.-pop-tail
+eval-end
+main-drain
+eval-reactmain-drain-done
+`);
+
+assertEq(!!log.match(regex), true)
+
+assertEq(dbg1.log, 'debugger,uncaught,step,enter,bp,exception,pop,');
+assertEq(dbg2.log, 'debugger,uncaught,step,enter,bp,exception,pop,');
+assertEq(dbg3.log, 'debugger,uncaught,step,enter,bp,exception,pop,');