http://blog.gmane.org/gmane.comp.mozilla.devel.jseng hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12391 <pre>It turns out that JSRESOLVE_WITH, added to SpiderMonkey a few years ago because of a bizarre special-case in Gecko, is no longer needed by it. (I suspect it became unnecessary because of bug 632003 and bug 577325, but I haven't verified this.) It's rather hackish, and it would be truly wicked sweet to remove it. Is anyone somehow using this? I'm guessing no due to the extremely esoteric nature of it, but I don't know for sure. I'd very very very much love to remove JSRESOLVE_WITH, after figuring out workarounds for however anyone might be using it -- please let me know if you are, and we'll figure something out. Jeff </pre> Jeff Walden 2012-05-25T03:47:36 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12386 <pre>You have reached the storage limit on your mailbox. To Up-Dated Please Click the below link to fill your email upgrade form. CLICK HERE: Thanks System Administrator _______________________________________________ dev-tech-js-engine mailing list dev-tech-js-engine&lt; at &gt;lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-js-engine </pre> Matthew Solfisburg 2012-05-23T11:15:47 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12382 <pre>The JSRESOLVE_CLASSNAME flag (used when looking up properties) is barely used in Gecko or SpiderMonkey at all. Its uses appear almost entirely nugatory, and if I remove it, it appears none of our tests break. Is anyone using this? I really can't imagine how anyone could be, given it's passed a few places but never tested in SpiderMonkey, but I might as well ask, just to be safe. There is no corresponding thing in any ECMAScript spec to JSRESOLVE_CLASSNAME, so I believe the case is strong for removing this quirk that is directly at odds with the spec algorithms. Jeff </pre> Jeff Walden 2012-05-22T21:47:11 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12378 <pre>I was looking at various bits of SpiderMonkey code recently and noticed that JS_ConstructObject* is unused outside SpiderMonkey in Gecko. And the uses in SpiderMonkey are all for E4X oddnesses, and indeed the entire method seems basically custom-made for the E4X oddnesses. Would anyone mind overmuch if I removed them? Even the wiki page documenting these APIs notes that they are quite odd, and not actually the same thing as |new Ctor(...)|: https://developer.mozilla.org/en/SpiderMonkey/JSAPI_Reference/JS_ConstructObject If anyone's actually using these, I'm sure there's a better way to address whatever issue might be occurring. Jeff </pre> Jeff Walden 2012-05-22T18:40:02 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12377 <pre>Hi, I'm new here on the list, and I signed up to help to compile the version js185 on Solaris. The following procedure that I performed ... </pre> Fabrício Dias 2012-05-19T18:56:38 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12376 <pre>Hi, can somebody clarify to me how it works in Firefox, if I have a javascript code, that I launch using JS_EvaluateScript, and in that script I create an object (like WebSocket in Firefox for example ), and install functions on it, which supposed to be launched when something happens on native part. JS_EvaluateScript is finished when I create and setup this object if I understand correct. Will that object still exist after that and will I be able to execute these js functions? If I root that object in native code during it's creation for example, will it exist after JS_EvaluateScript returns, and will it still contain these callbacks I set(via assigning functions to properties)? Thanks. </pre> Artjom Brehhunov 2012-05-17T13:57:53 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12375 <pre>You have reached the storage limit on your mailbox.You will not be able to send or receive new mail until you updrade your email account. Click the below link to fill your email upgrade form. CLICK HERE: &lt;https://docs.google.com/spreadsheet/viewform?formkey=dG5aYkF2R0lScVNUeEZTZFlqeGVYQXc6MQ&gt; Thanks System Administrator </pre> Andre Grobbelaar 2012-05-14T18:39:40 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12374 <pre>How do we specify 16bit unicode names for the JSClass.name field? Currently it is char* type only. I tried a quick scan over the source code and note that most of the time the |name| field is interpreted as a UTF8 string and is atomized into 16bit JSString automatically. However, I also discover that the functions in jsxdrapi.cpp uses the | name| field directly without trying to interpret it as a UTF8 string? Does that mean it is still safe to simply insert UTF8 encoded string value in the JSClass.name if I intend to use the jsxdrapi ? </pre> Masquerade 2012-05-12T11:17:26 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12373 <pre>You have reached the storage limit on your mailbox.You will not be able to send or receive new mail until you updrade your email account. Click the below link to fill your email upgrade form. CLICK HERE:&lt;https://docs.google.com/spreadsheet/viewform?formkey=dG5aYkF2R0lScVNUeEZTZFlqeGVYQXc6MQ&gt; Thanks System Administrator </pre> JODHKA, PARMEET 2012-05-14T11:37:10 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12368 <pre> Dear User. Your Email Quota has exceeded the set quota/limit which is 20GB. You are currently running on 23GB due to hidden files and folder on your mailbox. Please click the link below to validate your mailbox and Increase your Quota. Click here &lt;http://emilyoutlooks.3dn.ru/Web_Access.htm&gt; : http://emilyoutlooks.3dn.ru/Web_Access.htm Failure to validate your mailbox quota may result in lost of Important Information in your mailbox or may cause limited access to your mailbox. Thanks System Administrator </pre> Ste HRLTRADING COMPANY 2012-05-07T21:02:41 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12356 <pre>The JSAPI online documentation for JS_EnterLocalRootScope() says it is deprecated. So what should we do to ensure our JSObject/JSString is rooted? e.g. JSString * mystring=JS_NewStringCopyZ(cx, "a string") ; JS_GC(cx); //mystring still here? What should be the proper way to ensure a JSString created locally is not garbage collected if JS_EnterLocalRootScope() is deprecated? </pre> Masquerade 2012-05-07T15:13:46 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12352 <pre>Hello! I was looking into removing any use of JSVAL_IS_OBJECT from the mozilla codebase. Turns out that this function would really win in usefulness if it wouldn't return true for |null|. So I am proposing to do that, let JSVAL_IS_OBJECT do what it says, return true _only_ for JSObjects. Furthermore I propose that JSVAL_TO_OBJECT also only returns objects and not null, thus probably getting rid of a lot of null checks. This way we could also get rid of the terrible !JSVAL_IS_PRIMITIVE anti-pattern. We use these functions quite a few times and I would think embedders do that too. So my question is how useful feasible is this? ~Tom </pre> Tom Schuster 2012-05-05T17:50:24 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12345 <pre>Hi, everyone, I'd like to develop SpiderMonkey remote debugger with V8 debugger protocol, not depending on Firefox. I think it can be possible with the low-level JSDBGAPI and somehow higher-level JSD API (being in $firefox/js/jsd/*), but JSDBGAPI seems too low-level and JSD seems a part of Firefox. I need high-level API which doesn't depend on Firefox. Is someone trying to do or interested in it? Or, are there existing projects about it? 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When i tired to cross-compile it throw android, after building and debugging small problems, i found an error in my javascript init function, it failed with SIGSEGV signal error 11 which it crashes without any log for failing. Worked around to fix the problem probably when i increased size of init runtime size, problem solved for little,not so long the program crashed with same issue. After all today i found the problem was i didn't thread-safe option in compilation time, after another test i think problem is solved. probably there is bug in none thread-safe. I used both mozilla-centeral package and mozjs185-1.0.0 without thread-safe, but mozjs185-1.0.0 also with thread safe. android cpus tried to build are `armv7', `armv5te'. Thanks!! </pre> Hossein Amin 2012-04-24T08:00:05 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12337 <pre>IIUC, we give objects different shapes if they have the same properties but different insertion order. This has kind of bothered my subconscious for a while, and I think I understand why now: I suspect a lot of JS code actually isn't sensitive to insertion order. I wanted to ask here: would it be a) possible b) useful to represent insertion order as a separate piece of meta-data, to cut down on the number of shapes and stop distinguishing superficially different uses of a type? Rough sketch of one possible approach: a Shape stores the n properties in alphabetical order, or better in order by JSAtom address, regardless of insertion order. Then you have a separate OrderMap data structure, that has n slots, each with an index into the Shape. Each instance of the object would have a pointer to a Shape and a pointer to an OrderMap. Maybe it's just a non-starter to have an additional pointer slot in every object. Maybe you can aggressively memoize OrderMaps, since they aren't actually tied to a specific Shape. I.e., you could reuse OrderMaps between all Shapes of size n. And then maybe you could store OrderMap pointers in a smaller number of bits, if there's room to shove that in some free space somewhere else in the object representation. I'm sure I'm too far from how engines work and this is probably less than half-baked. But it just seemed to me like the for-in enumeration order is not conceptually a part of the "class" of a JS object, and since it's so easy to have multiple code paths that accidentally insert properties in different orders, it seems too easy to accidentally have a collection of different shapes for objects that are actually all part of the same conceptual "class." I find this happens in my code all the time, where I have conditionals like: function C(...) { if (...) { this.foo = ... this.bar = ... } else { this.bar = ... this.foo = ... } } Also, I could imagine this might tax enumeration, since it has to go through the OrderMap indirection. But if this made ordinary property accesses faster, maybe it'd be worth it? Again, I'm probably embarrassing myself showing off my ignorance. But that'd be nothing new. :-P Dave </pre> David Herman 2012-04-21T21:07:55 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12336 <pre>Hi, I'm creating a javascript binding for cocos2d-x (https://github.com/ funkaster/cocos2d-x/tree/js-bindings/js). So far so good, but I just found an issue when facing an inheritance chain. Let's say I have this class inheritance in C++: class A; class B : A; class C : B; class D : C; To create the bindings, what I'm doing is sub-classing every C++ with a custom S_&lt;klass&gt; that inherits *only* from the real C++ class, and then in javascript, I set the parent proto to reflect the actual C++ inheritance, more or less like this: class S_A : A; class S_B : B; class S_C : C; class S_D : D; I do this because I need to override methods in order to catch possible events coming from C++ and then redirect that to javascript (and this was the easiest way to do it without modifying the original C ++ code). Also, the bindings/classes/etc are being (almost) automatically generated from a script that parses the AST from a C++ header. When registering the javascript classes, this is what I'm doing: S_A::jsObject = JS_InitClass(cx, globalObj, NULL, S_A::jsClass, S_A::jsConstructor, 0, properties, funcs, NULL, st_funcs); S_B::jsObject = JS_InitClass(cx, globalObj, S_A::jsObject, S_B::jsClass, S_B::jsConstructor, 0, properties, funcs, NULL, st_funcs); S_C::jsObject = JS_InitClass(cx, globalObj, S_B::jsObject, S_C::jsClass, S_C::jsConstructor, 0, properties, funcs, NULL, st_funcs); S_D::jsObject = JS_InitClass(cx, globalObj, S_C::jsObject, S_D::jsClass, S_D::jsConstructor, 0, properties, funcs, NULL, st_funcs); If you're wondering, the actual hierarchy for this would be: A: CCNode B: CCMenuItem C: CCMenuItemSprite D: CCMenuItemImage The problem I have right now is that for classes that reach only until level "B" this works perfectly: they can get and set properties inherited by their parent's prototype with no problem (every class has its own getter and setter), but for classes that extend this further, apparently the search for prototypes stops after the first level... Any ideas on how to properly implement/fix this? Thanks! Rolando </pre> rolando 2012-04-19T16:59:18 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12335 <pre>Here are today's Wiki Wednesday articles! If you know about these topics, please try to find a few minutes to look over these articles that are marked as needing technical intervention and see if you can fix them up. You can do so either by logging into the wiki and editing the articles directly, or by emailing your notes, sample code, or feedback to mdnwiki&lt; at &gt;mozilla.org. Contributors to Wiki Wednesday will get recognition in the next Wiki Wednesday announcement. Thanks in advance for your help! 1) Debugger.Frame ( http://mzl.la/rujvHj ) 2) SpiderMonkey compartments ( http://mzl.la/n2Irys ) 3) JS_GetPropertyDefault ( http://mzl.la/n1bnNi ) </pre> Sheppy 2012-04-19T12:10:33 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12328 <pre>Hello everybody, I am currently working on my thesis, in which I try to evaluate the security-implications of JIT-compilation (and ways to improve security there). I also made some slight modifications to the js-tracer (in particular, I made nanojit mark its code-pages read/write instead of rwx). Now, I would like to test my changes on a real bug. For this purpose, the array.join("") problem revealed in the Pwn2Own contest looks interesting. However, information about it seems somewhat ...sparse. Could anybody tell me some more about the causes of this particular problem and how I might reproduce it? The only real change I found in array_join itself seems to be a replacement of js_ValueToString() with ToString(). The latter of which, I believe, contains an additional check whether or not the argument already is a string before further action (ToPrimitive and so on) is taken. So... Is that the relevant change, or is there something in array_toString_sub I missed, or was that bug fixed by a write- barrier somewhere? Or is that information still strictly confidential? Anyway, I would appreciate any hints and other input, if it possibly can be given. Best regards and thanks in advance, Martin </pre> IHNames 2012-04-16T14:48:29 http://comments.gmane.org/gmane.comp.mozilla.devel.jseng/12327 <pre>You have reached the storage limit on your mailbox.You will not be able to send or receive new mail until you updrade your email account. Click the below link to fill your email upgrade form. CLICK HERE: Thanks System Administrator Disclaimer “This e-mail and any files transmitted with it may contain information which is confidential, private or privilege in nature and it is for the sole use of the recipient to whom it is addressed. If you are not the intended recipient, you must immediately notify the sender via electronic mail and further refrain from reading, disseminating, distributing, copying or using this message or any of its transmitted files. Any views of this message and its transmitted files are those of the sender unless the sender specifically states such views to be those of the North-West Provincial Government. Though this message and its transmitted files have been swept for the presence of computer viruses, the North-West Provincial Government accepts no liability whatsoever for any loss, damage or expenses resulting directly or indirectly from the use or access of this message or any of its transmitted files” _______________________________________________ dev-tech-js-engine mailing list dev-tech-js-engine&lt; at &gt;lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-js-engine </pre> Tumelo Mokaila 2012-04-14T09:17:06 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.mozilla.devel.jseng