Bug 1279086 - Allow multiple interrupt callbacks (r=dvander)

dom/base/nsGlobalWindow.cpp

@@ -11154,14 +11154,14 @@ nsGlobalWindow::ShowSlowScriptDialog()
     buttonFlags += nsIPrompt::BUTTON_TITLE_IS_STRING * nsIPrompt::BUTTON_POS_2;
 
   // Null out the operation callback while we're re-entering JS here.
-  JSInterruptCallback old = JS_SetInterruptCallback(cx, nullptr);
+  bool old = JS_DisableInterruptCallback(cx);
 
   // Open the dialog.
   rv = prompt->ConfirmEx(title, msg, buttonFlags, waitButton, stopButton,
                          debugButton, neverShowDlg, &neverShowDlgChk,
                          &buttonPressed);
 
-  JS_SetInterruptCallback(cx, old);
+  JS_ResetInterruptCallback(cx, old);
 
   if (NS_SUCCEEDED(rv) && (buttonPressed == 0)) {
     return neverShowDlgChk ? AlwaysContinueSlowScript : ContinueSlowScript;

dom/workers/RuntimeService.cpp

@@ -994,7 +994,7 @@ InitJSContextForWorker(WorkerPrivate* aWorkerPrivate, JSContext* aWorkerCx)
     return false;
   }
 
-  JS_SetInterruptCallback(aWorkerCx, InterruptCallback);
+  JS_AddInterruptCallback(aWorkerCx, InterruptCallback);
 
   js::SetCTypesActivityCallback(aWorkerCx, CTypesActivityCallback);
 

js/src/jsapi-tests/testSlowScript.cpp

@@ -24,7 +24,7 @@ RequestInterruptCallback(JSContext* cx, unsigned argc, jsval* vp)
 
 BEGIN_TEST(testSlowScript)
 {
-    JS_SetInterruptCallback(cx, InterruptCallback);
+    JS_AddInterruptCallback(cx, InterruptCallback);
     JS_DefineFunction(cx, global, "requestInterruptCallback", RequestInterruptCallback, 0, 0);
 
     test("while (true)"

js/src/jsapi.cpp

@@ -4617,18 +4617,24 @@ JS_CheckForInterrupt(JSContext* cx)
     return js::CheckForInterrupt(cx);
 }
 
-JS_PUBLIC_API(JSInterruptCallback)
-JS_SetInterruptCallback(JSContext* cx, JSInterruptCallback callback)
+JS_PUBLIC_API(bool)
+JS_AddInterruptCallback(JSContext* cx, JSInterruptCallback callback)
 {
-    JSInterruptCallback old = cx->interruptCallback;
-    cx->interruptCallback = callback;
-    return old;
+    return cx->interruptCallbacks.append(callback);
 }
 
-JS_PUBLIC_API(JSInterruptCallback)
-JS_GetInterruptCallback(JSContext* cx)
+JS_PUBLIC_API(bool)
+JS_DisableInterruptCallback(JSContext* cx)
 {
-    return cx->interruptCallback;
+    bool result = cx->interruptCallbackDisabled;
+    cx->interruptCallbackDisabled = true;
+    return result;
+}
+
+JS_PUBLIC_API(void)
+JS_ResetInterruptCallback(JSContext* cx, bool enable)
+{
+    cx->interruptCallbackDisabled = enable;
 }
 
 /************************************************************************/

js/src/jsapi.h

@@ -4305,11 +4305,14 @@ JS_CheckForInterrupt(JSContext* cx);
  * if it re-enters the JS engine. The embedding must ensure that the callback
  * is disconnected before attempting such re-entry.
  */
-extern JS_PUBLIC_API(JSInterruptCallback)
-JS_SetInterruptCallback(JSContext* cx, JSInterruptCallback callback);
+extern JS_PUBLIC_API(bool)
+JS_AddInterruptCallback(JSContext* cx, JSInterruptCallback callback);
 
-extern JS_PUBLIC_API(JSInterruptCallback)
-JS_GetInterruptCallback(JSContext* cx);
+extern JS_PUBLIC_API(bool)
+JS_DisableInterruptCallback(JSContext* cx);
+
+extern JS_PUBLIC_API(void)
+JS_ResetInterruptCallback(JSContext* cx, bool enable);
 
 extern JS_PUBLIC_API(void)
 JS_RequestInterruptCallback(JSContext* cx);

js/src/shell/js.cpp

@@ -7623,7 +7623,7 @@ main(int argc, char** argv, char** envp)
     JS_SetSecurityCallbacks(cx, &ShellPrincipals::securityCallbacks);
     JS_InitDestroyPrincipalsCallback(cx, ShellPrincipals::destroy);
 
-    JS_SetInterruptCallback(cx, ShellInterruptCallback);
+    JS_AddInterruptCallback(cx, ShellInterruptCallback);
     JS::SetBuildIdOp(cx, ShellBuildId);
     JS::SetAsmJSCacheOps(cx, &asmJSCacheOps);
 

js/src/vm/Runtime.cpp

@@ -149,7 +149,7 @@ JSRuntime::JSRuntime(JSRuntime* parentRuntime)
     telemetryCallback(nullptr),
     handlingSegFault(false),
     handlingJitInterrupt_(false),
-    interruptCallback(nullptr),
+    interruptCallbackDisabled(false),
     getIncumbentGlobalCallback(nullptr),
     enqueuePromiseJobCallback(nullptr),
     enqueuePromiseJobCallbackData(nullptr),
@@ -530,11 +530,16 @@ InvokeInterruptCallback(JSContext* cx)
     // Important: Additional callbacks can occur inside the callback handler
     // if it re-enters the JS engine. The embedding must ensure that the
     // callback is disconnected before attempting such re-entry.
-    JSInterruptCallback cb = cx->runtime()->interruptCallback;
-    if (!cb)
+    if (cx->runtime()->interruptCallbackDisabled)
         return true;
 
-    if (cb(cx)) {
+    bool stop = false;
+    for (JSInterruptCallback cb : cx->runtime()->interruptCallbacks) {
+        if (!cb(cx))
+            stop = true;
+    }
+
+    if (!stop) {
         // Debugger treats invoking the interrupt callback as a "step", so
         // invoke the onStep handler.
         if (cx->compartment()->isDebuggee()) {

js/src/vm/Runtime.h

@@ -638,7 +638,9 @@ struct JSRuntime : public JS::shadow::Runtime,
         return handlingJitInterrupt_;
     }
 
-    JSInterruptCallback interruptCallback;
+    using InterruptCallbackVector = js::Vector<JSInterruptCallback, 2, js::SystemAllocPolicy>;
+    InterruptCallbackVector interruptCallbacks;
+    bool interruptCallbackDisabled;
 
     JSGetIncumbentGlobalCallback getIncumbentGlobalCallback;
     JSEnqueuePromiseJobCallback enqueuePromiseJobCallback;

js/xpconnect/src/XPCJSContext.cpp

@@ -3476,7 +3476,7 @@ XPCJSContext::Initialize()
 #endif
     JS_SetAccumulateTelemetryCallback(cx, AccumulateTelemetryCallback);
     js::SetActivityCallback(cx, ActivityCallback, this);
-    JS_SetInterruptCallback(cx, InterruptCallback);
+    JS_AddInterruptCallback(cx, InterruptCallback);
     js::SetWindowProxyClass(cx, &OuterWindowProxyClass);
 
     // The JS engine needs to keep the source code around in order to implement

js/xpconnect/src/XPCShellImpl.cpp

@@ -1421,7 +1421,7 @@ XRE_XPCShellMain(int argc, char** argv, char** envp,
         sScriptedInterruptCallback = new PersistentRootedValue;
         sScriptedInterruptCallback->init(cx, UndefinedValue());
 
-        JS_SetInterruptCallback(cx, XPCShellInterruptCallback);
+        JS_AddInterruptCallback(cx, XPCShellInterruptCallback);
 
         argc--;
         argv++;