223646 2021-03-23 10:39:01 -0700 [GTK][WPE] JSC crashes if a function expects a parameter but doesn't receive any 2021-03-25 07:36:47 -0700 1 1 1 Unclassified WebKit WebKitGTK Other Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 berto cgarcia aperez bugs-noreply cgarcia ews-watchlist keith_miller mark.lam msaboff saam tzagallo oldest_to_newest 1742905 0 424039 berto 2021-03-23 10:39:01 -0700 Created attachment 424039 Test case The attached test case uses the JSC API to create a function named "foo()" that receives a parameter of type JSCValue: jsc_value_new_function(ctx, "foo", G_CALLBACK(foo_cb), NULL, // user_data NULL, // destroy_notify G_TYPE_NONE, // return_type 1, // n_params JSC_TYPE_VALUE) The callback foo_cb() simply prints the value to the standard output, you can see it with ./test 'foo(4)' or ./test 'foo("Hello world")' However if you call foo() without any parameters the process crashes before foo_cb() even gets called. GLib-GObject:ERROR:../../../gobject/gclosure.c:1169:value_to_ffi_type: assertion failed: (type != G_TYPE_INVALID) Aborted This should produce an exception that the program can handle. 1743293 1 cgarcia 2021-03-24 06:54:24 -0700 We need to fix the crash, but I don't think we should throw a exception, it should just receive undefined. 1743296 2 aperez 2021-03-24 07:05:11 -0700 (In reply to Carlos Garcia Campos from comment #1) > We need to fix the crash, but I don't think we should throw a exception, it > should just receive undefined. I had a patch half done which would raise TypeError. I don't know if we can reliably pass “undefined” to C functions... What would “undefined” be e.g. for an “int32_t” or a “char*”? 1743303 3 cgarcia 2021-03-24 07:26:33 -0700 We would pass undefined for the case of parameters expecting JSCValue, otherwise we will throw an exception. 1743371 4 aperez 2021-03-24 10:08:20 -0700 (In reply to Carlos Garcia Campos from comment #3) > We would pass undefined for the case of parameters expecting JSCValue, > otherwise we will throw an exception. This sounds perfect to me :) 1743743 5 424236 cgarcia 2021-03-25 05:38:02 -0700 Created attachment 424236 Patch 1743766 6 424236 aperez 2021-03-25 07:29:09 -0700 Comment on attachment 424236 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=424236&action=review > Source/JavaScriptCore/API/glib/JSCCallbackFunction.cpp:131 > + jscContextJSValueToGValue(context.get(), argumentIndex < argumentCount ? arguments[argumentIndex] : JSValueMakeUndefined(jsContext), This is calling JSValueMakeUndefined() for each missing parameter. I suppose it's fast anyway because “undefined” is a singleton. We could use two loops, one for the parameters which were passed to the function call, and a second one for the missing parameters, and call JSMakeUndefined only once. That would also allow the conditional with the ternary operator in each iteration of the loop 🤔️ > Source/JavaScriptCore/API/glib/JSCContext.cpp:465 > +static gpointer jscContextJSValueToWrappedObject(JSCContext* context, JSValueRef jsValue) static inline? 1743767 7 cgarcia 2021-03-25 07:36:29 -0700 Committed r275031 (235752@main): <https://commits.webkit.org/235752@main> 1743768 8 aperez 2021-03-25 07:36:47 -0700 (In reply to Adrian Perez from comment #6) > Comment on attachment 424236 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=424236&action=review > > > Source/JavaScriptCore/API/glib/JSCCallbackFunction.cpp:131 > > + jscContextJSValueToGValue(context.get(), argumentIndex < argumentCount ? arguments[argumentIndex] : JSValueMakeUndefined(jsContext), > > This is calling JSValueMakeUndefined() for each missing parameter. I suppose > it's fast > anyway because “undefined” is a singleton. > > We could use two loops, one for the parameters which were passed to the > function call, > and a second one for the missing parameters, and call JSMakeUndefined only > once. That > would also allow the conditional with the ternary operator in each iteration > of the > loop 🤔️ > > > Source/JavaScriptCore/API/glib/JSCContext.cpp:465 > > +static gpointer jscContextJSValueToWrappedObject(JSCContext* context, JSValueRef jsValue) > > static inline? Forgot to say in the overall comment, to be clear: let's merge this as-is, because anyway it is not worth it to optimize without profiling; I was only throwing ideas around :) 424039 2021-03-23 10:39:01 -0700 2021-03-23 10:39:01 -0700 Test case test.c text/x-csrc 905 berto CiNpbmNsdWRlIDxqc2MvanNjLmg+CiNpbmNsdWRlIDxnbGliLmg+CiNpbmNsdWRlIDxzdGRpby5o PgoKc3RhdGljIHZvaWQKZm9vX2NiIChKU0NWYWx1ZSAqdmFsKQp7CiAgICBwcmludGYoIiVzXG4i LCBqc2NfdmFsdWVfdG9fanNvbih2YWwsIDApKTsKfQoKaW50IG1haW4oaW50IGFyZ2MsIGNoYXIg Kiphcmd2KQp7CiAgICBpZiAoYXJnYyAhPSAyKSB7CiAgICAgICAgZnByaW50ZihzdGRlcnIsICJV c2FnZTogdGVzdCA8anMtY29kZT5cbiIpOwogICAgICAgIHJldHVybiAxOwogICAgfQogICAgSlND Q29udGV4dCAqY3R4ID0ganNjX2NvbnRleHRfbmV3KCk7CiAgICBKU0NWYWx1ZSAqZm9vX2ZuID0K ICAgIAlqc2NfdmFsdWVfbmV3X2Z1bmN0aW9uKGN0eCwKICAgIAkJImZvbyIsCiAgICAgICAgICAg ICAgICBHX0NBTExCQUNLKGZvb19jYiksCiAgICAgICAgICAgICAgICBOVUxMLCAgICAgICAgICAg IC8vIHVzZXJfZGF0YQogICAgCQlOVUxMLCAgICAgICAgICAgIC8vIGRlc3Ryb3lfbm90aWZ5CiAg 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