I recently updated the documentation for Info.Holder() and Info.This() - they only differ if you use a hidden prototype.
The comment on Signature you quoted is correct - your example code doesn't use inheritance of the FunctionTemplate but JS inheritance. On Mon, May 29, 2017 at 9:08 AM Zac Hansen <xax...@gmail.com> wrote: > My understanding is that the signature picking out the object in the > prototype chain was the difference between info.This and info.Holder. > Mostly from reading the thread I linked previously. > > Also, this is from the doxygen docs for signature: > > > A receiver matches a given signature if the receiver (or any of its > hidden prototypes) was created from the signature's FunctionTemplate > <http://v8.paulfryzel.com/docs/master/classv8_1_1_function_template.html>, > or from a FunctionTemplate > <http://v8.paulfryzel.com/docs/master/classv8_1_1_function_template.html> that > inherits directly or indirectly from the signature's FunctionTemplate > <http://v8.paulfryzel.com/docs/master/classv8_1_1_function_template.html>. > > > On Mon, May 29, 2017 at 12:01 AM, Zac Hansen <xax...@gmail.com> wrote: > >> In this thread: >> https://groups.google.com/forum/#!topic/v8-users/Axf4hF_RfZo >> >> it says: >> >> > If your function has a signature that says that it must be called on a >> particular type v8 will search the prototype chain for an object of >> that type when the function is called. >> >> >> Given my code, I don't understand why making an object that directly sets >> its prototype as an object capable of calling a function with a signature >> wouldn't be able to call that same function. >> >> Is that thread I linked wrong? Or am I misunderstanding something? >> >> On Sun, May 28, 2017 at 11:57 PM, Jochen Eisinger <joc...@chromium.org> >> wrote: >> >>> A signature requires the object either be constructed from the same >>> FunctionTemplate (as e.g. new MyType() does), or from a FunctionTemplate >>> that inherited from the signature's FunctionTemplate. >>> >>> Note however that the "info.Holder" would still point at the receiver, >>> and not the prototype with the matching signature :/ >>> >>> On Sun, May 28, 2017 at 7:27 PM Zac Hansen <xax...@gmail.com> wrote: >>> >>>> I create a "constructor" FunctionTemplate, create a signature from that >>>> FunctionTemplate, then on that FunctionTemplate's PrototypeObject >>>> ObjectTemplate, I create a bunch of FunctionTemplate's using the signature >>>> I generated before. >>>> >>>> I can call the function with objects created directly from the >>>> "constructor" FunctionTemplate. But if I call it from an object with that >>>> object in the prototype chain, it doesn't work. >>>> >>>> base = new MyType(); >>>> derived = Object.create(base); // setting .__proto__ has the same >>>> behavior >>>> >>>> base.some_native_function(); <== works >>>> >>>> derived.some_native_function(); <== TypeError: Illegal invocation >>>> >>>> >>>> >>>> Anyone know what I might be doing wrong? If I remove the signature, >>>> everything works fine, but then holder == this when calling with derived, >>>> which isn't what I want. >>>> >>>> --Zac >>>> >>>> -- >>>> -- >>>> v8-users mailing list >>>> v8-users@googlegroups.com >>>> http://groups.google.com/group/v8-users >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "v8-users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to v8-users+unsubscr...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- >>> -- >>> v8-users mailing list >>> v8-users@googlegroups.com >>> http://groups.google.com/group/v8-users >>> --- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "v8-users" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/v8-users/dR8oI0ZwzG0/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> v8-users+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
