Tachyon-list

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258 discussions

Tachyon Shell
by chevalma＠iro.umontreal.ca 03 Fév '11

03 Fév '11

I thought it would be useful for experimentation to have a simple Tachyon shell... So I hacked one together quickly this afternoon. To run it, you need to rebuild your V8 (I added a readConsole function). You can then run it with "make run". The bootstrap run is now accessible through "make bootstrap". See example below: t> a = 3 "<string>"@1.5-1.6: warning -- semicolon was inserted after this token t> print(a + 2); 5 t> b = [1,2,3]; t> print(b.length); 3 t> ^Cmake: *** [run] Interrupt Currently, you have to type print(...) if you want to print the value of something, and you have to terminate each input with EOF... I may change that to just enter since it's more convenient. This is obviously a quick hack as it stands, but it should be useful for testing out simple things for debugging. - Maxime

2 1

Stdlib Functions/Refactorings
by chevalma＠iro.umontreal.ca 03 Fév '11

03 Fév '11

Hello Marc & Bruno, I'd like to start integrating your stdlib code into Tachyon and testing it out with the primitives we have. However, this might require some (fairly minor?) refactorings. If you have time, could you come by the lab today or tomorrow afternoon so I can tell you what I have in mind and discuss integration into the Tachyon runtime? - Maxime

3 11

DLS 2010 Keynote
by Erick Lavoie 03 Fév '11

03 Fév '11

The presentation given by Allen Wirfs-Brock at DLS 2010 gives an extremely interesting perspective on the evolution of dynamic languages and the work to be done for Javascript: http://www.dynamic-languages-symposium.org/dls-10/program/media/AllenWirfsB… Mark had talked about it but I did not take a look at it until now. Erick

2 1

30 bit integers
by chevalma＠iro.umontreal.ca 02 Fév '11

02 Fév '11

Hi Marc, For the 30 bit integer issue we had with the parser, I was thinking it would be good to perhaps, instead of doing the test on the AST once its built, try to do the test as number values are being computed in the lexer. If you're looking for something else to do to help us, we could use a BigInteger type of class, since we currently have no way to represent integers bigger than 30 bits in JavaScript, and even when we do, 64-bit floats can't be used to represent 64 bit integers. If you decide to implement this, you could put it under utility/biginteger.js - Maxime

1 0

String object vs string value
by Bruno Dufour 01 Fév '11

01 Fév '11

Hi, I am trying to complete the implementation of the String stdlib functions. I hit a small roadblock that has me puzzled. Consider the following code: // ---- var s = "abc"; function f(x) { if (s === this) print("global = this"); if (x === this) print("arg = this"); if (x === s) print("arg = global"); } String.prototype.f = f; s.f(s); // ---- The code only prints the last string (arg = global) when run with d8. The only explanation I can see is that using a string value (typeof s === 'string') as the receiver of a call (and thus the implicit 'this' parameter) converts it to a string object (typeof this === 'object'). Can somebody point me to the part of the ECMAScript spec that explains this behaviour? I may be blind, but I can't seem to find it... Thanks, Bruno

2 3

stdlib/arrays.js commit breaks make test
by chevalma＠iro.umontreal.ca 31 Jan '11

31 Jan '11

stdlib/arrays.js:919: ReferenceError: error is not defined error("lastIndexOf, results are different"); ^ error is defined in utility/debug.js. Please make sure to always run "make test" before pushing your commits. - Maxime

2 5

Fwd: [racket] moby/wescheme & TCO
by Marc Feeley 31 Jan '11

31 Jan '11

It seems like tail-calls will become mandatory in the not too distant future. What support do we have for tail-calls? I remember discussing this early on in the project, but I'm not sure that at this point in time the intermediate representation supports it. Marc Begin forwarded message: > From: David Herman <dherman(a)ccs.neu.edu> > Date: January 30, 2011 12:04:29 PM EST > To: YC <yinso.chen(a)gmail.com> > Cc: Racket Users <users(a)racket-lang.org> > Subject: Re: [racket] moby/wescheme & TCO > > I don't have your answer, but an interesting anecdote: I learned recently why the setTimeout(k, 0) trick is so slow. Apparently too many web sites (including nytimes.com, I believe) rely on a minimum delay of somewhere between 4 and 10ms to do animations, so browsers have to throttle the events. As I understand it, Firefox uses a 10ms minimum delay, and Chrome uses 4ms. > > Since Chrome seems to have gotten away with dropping it to 4ms, we may be able to do the same -- though I haven't heard anyone specifically say they planned to. Maybe at some point we can eliminate this silliness altogether, and setTimeout could become a more viable tool for compiler-writers. But happily, the ECMAScript committee recently agreed to try to mandate proper tail calls in the next version of the standard. So with a little (okay, maybe more than a little) luck, compiler-writers may eventually be able to rely on having tail calls built in to the web. > > Dave > > On Jan 29, 2011, at 9:12 PM, YC wrote: > >> Hi all - >> >> I am wondering if there are documentations on how moby/wescheme solve the tail call optimization issue to compile down to javascript. My google'fu is failing me. >> >> If not - can someone shed some light on how it's done? >> >> Thanks, >> yc >> >> _________________________________________________ >> For list-related administrative tasks: >> http://lists.racket-lang.org/listinfo/users > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users

2 8

make perf
by Marc Feeley 31 Jan '11

31 Jan '11

I got this output from a "make perf": Generating report Report file: benchreport.html uname: illegal option -- o usage: uname [-amnprsv] cat: /proc/cpuinfo: No such file or directory sh: free: command not found TypeError: Cannot read property '1' of undefined at Object.getSystemInfo (bench/reports.js:240:35) at Object.genReport (bench/reports.js:72:40) at main (bench/benchmain.js:120:15) at bench/benchmain.js:130:5 It would seem that it assumes a Linux system. Can this be modified to work on Mac OS X also? For uname, you could use "uname -a" which works on Mac OS X. /proc/cpuinfo does not exist on Mac OS X. On Mac OS X you can get a bunch of system parameters by executing the system program "system_profiler". You'll get this on stdout: % system_profiler Hardware: Hardware Overview: Model Name: MacBook Pro Model Identifier: MacBookPro5,3 Processor Name: Intel Core 2 Duo Processor Speed: 2.8 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 6 MB Memory: 4 GB Bus Speed: 1.07 GHz Boot ROM Version: MBP53.00AC.B03 SMC Version (system): 1.48f2 Serial Number (system): W893814U64C Hardware UUID: 3BC167BA-45C4-529A-BA30-3658F1E9966F Sudden Motion Sensor: State: Enabled Network: Bluetooth: ... Marc

1 0

Array operations
by Marc Feeley 30 Jan '11

30 Jan '11

I've implemented a bunch of Array library functions in stdlib/arrays.js . The code includes unit tests. Specifically the following functions are implemented: Array.prototype.toString Array.prototype.concat Array.prototype.join Array.prototype.pop Array.prototype.push Array.prototype.reverse Array.prototype.shift Array.prototype.slice Array.prototype.sort Array.prototype.splice Array.prototype.unshift Array.prototype.indexOf Array.prototype.lastIndexOf Array.prototype.forEach Array.prototype.map Array.prototype.filter For the sort function I have used a non-recursive version of mergesort which I designed from scratch (I'd be interested to know if this algorithm already exists). To activate the functions, the assignments of the form Array.prototype.array_toString = array_toString; must be changed to Array.prototype.toString = array_toString; Marc

2 2

[Tachyon-list] http://www.cs.cmu.edu/~fp/courses/15213-s07/misc/gdb-commands.txt
by Marc Feeley 25 Jan '11

25 Jan '11

And this too. http://www.cs.cmu.edu/~fp/courses/15213-s07/misc/gdb-commands.txt Marc

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