Tachyon-list Juillet 2011

tachyon-list@iro.umontreal.ca

6 participants
6 discussions

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Meeting
by Marc Feeley 26 Jul '11

26 Jul '11

Can we have the Wednesday meeting at 10:15 AM instead of 2 PM? I have to be elsewhere at 2 PM. Marc

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x87 fucom
by Eric Thivierge 21 Jul '11

21 Jul '11

Info au sujet de l'instruction x87 'fucom' Le 'u' de cette instruction signifie 'unordered'. Elle a comme particuliarité le traitement d'un nombre NaN. Si un ou les deux opérandes sont SNaN, l'instruction active le bit IE (invalid-operation exception) du Status Word. Dans le cas de QNaN, l'instruction set les flags 'condition code' à 'unordered' mais pas l'IE. Bref, le 'u' ne veut pas dire unsigned. Eric

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Reading local files from javascript
by Bruno Dufour 16 Jul '11

16 Jul '11

Since there was a discussion yesterday about whether it is possible to read local files directly in JavaScript (i.e., not upload the contents to a server), here's an example of how it's done taken from the ProfileViewer tool I wrote a while back (http://www.iro.umontreal.ca/~dufour/tools/ProfileViewer/). Note this API requires a file selection dialog to be used. I don't think any browser will allow arbitrary access to disk. Also, there are some restrictions that vary between browsers (in particular when pages are accessed using file://). For a complete description of the API see http://dev.w3.org/2006/webapi/FileAPI. Here are the two relevant HTML elements used in the snippet: <input type="file" id="file" name="file" /> <button id="load" onclick="load();">Load</button> And here's the JS code (the API is event-based, the setup is in load() and should be self-explanatory): function load() { var selectedFile = document.getElementById("file").files[0]; var reader = new FileReader(); reader.onerror = onReadError; reader.onloadstart = onLoadStart; reader.onprogress = onProgressUpdate; reader.onload = onFileLoaded; reader.onabort = function(e) { alert('File read cancelled'); }; reader.readAsText(selectedFile); } function onReadError(e) { switch(e.target.error.code) { case e.target.error.NOT_FOUND_ERR: alert('File Not Found!'); break; case e.target.error.NOT_READABLE_ERR: alert('File is not readable'); break; case e.target.error.ABORT_ERR: break; // noop default: alert('An error occurred reading this file.'); }; } function onFileSelected(e) { btnLoad.disabled = false; } function onProgressUpdate(e) { if (e.lengthComputable) { var perc = Math.round((e.loaded / e.total) * 100); $("#progress").progressbar("value", perc); } } function onLoadStart(e) { activity.textContent = "Loading file..."; $("#progress").show(); $("#progress").progressbar("value", 0); } function onFileLoaded(e) { $("#progress").progressbar("value", 100); activity.textContent = "File loaded"; $("#progress").hide(); data = e.target.result; // process data here }

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Be there in 15 mins
by Marc Feeley 13 Jul '11

13 Jul '11

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Minimal processor design
by Erick Lavoie 12 Jul '11

12 Jul '11

See the vhdl design from Chuck Thacker at page 123 of http://www.vpri.org/pov/ Erick

1 0

Object Model for Photon
by Erick Lavoie 07 Jul '11

07 Jul '11

To understand the inspiration for the object model see the original work done by Ian Piumarta. *Slides for the presentation given at DLS 2006* http://www.dynamic-languages-symposium.org/dls-06/program/media/IanPiumarta… *Article published in the 1st International Workshop on Self-Sustaining Systems 2008*_ _Open, Extensible Object Models http://piumarta.com/software/cola/objmodel2.pdf_ _*Extension proposed to support prototype-based object models*_ http://piumarta.com/software/cola/prototypes.html __ _*Source code* http://www.piumarta.com/software/id-objmodel/ *Presentation given at Standford, "Building your own dynamic language"* Duration: 1h15 The presentation covers more than just the aforementioned object model and provides an interesting point of view on every component of a dynamic language implementation. http://www.youtube.com/watch?v=cn7kTPbW6QQ Discussion about objects starts at 17m25 and ends roughly at 33m30._ _ Erick

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Tachyon-list Juillet 2011