| --- Log opened Tue Mar 15 00:00:59 2011 |
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| --- Log closed Tue Mar 15 02:36:47 2011 |
| --- Log opened Tue Mar 15 02:42:40 2011 |
| 02:42 | | TheWatcher[zZzZ] [chris@Nightstar-b4529b0c.zen.co.uk] has joined #code |
| 02:42 | | Irssi: #code: Total of 26 nicks [10 ops, 0 halfops, 0 voices, 16 normal] |
| 02:42 | | mode/#code [+o TheWatcher[zZzZ]] by Reiver |
| 02:42 | | * Derakon links TW to http://tasvideos.org/forum/viewtopic.php?p=265447#265447 |
| 02:43 | | Irssi: Join to #code was synced in 48 secs |
| 02:49 | < Tarinaky> | Won't the main loop sail through again and again even if there's nothing to do? |
| 02:49 | <@Derakon> | Check the second-to-last line. |
| 02:49 | <@Derakon> | I assure you this code is fully-functional, and, as far as I'm aware, bug-free. |
| 02:50 | < Tarinaky> | second-to-last of what? |
| 02:52 | <@Derakon> | ...of the code? What else could I have been referring to? |
| 02:54 | < Tarinaky> | Wait, the article I'm reading or a different link? |
| 02:54 | <@Derakon> | Oh, sorry. I thought you were talking about http://tasvideos.org/forum/viewtopic.php?p=265447#265447 |
| 02:55 | <@Derakon> | I believe the sleep is implicit in that article. |
| 02:56 | < Tarinaky> | Apparently not. |
| 02:56 | < Tarinaky> | Now I'm confused. |
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| 04:38 | | SchoolPhox [NSwebIRC@Nightstar-d9d726da.exta.sait.ca] has joined #code |
| 04:38 | < SchoolPhox> | Does anyone mind if I ask a really low-level question? |
| 04:39 | < SchoolPhox> | I have a for loop. This is what I'm using to make it " for(i = 12; i <= 24; i++)" |
| 04:40 | < SchoolPhox> | Now, the behaviour for this, assuming nothing changes i in the loop, is that i will initialize at 12, and increment every repetition until it equals 24. |
| 04:40 | < SchoolPhox> | Is that correct? |
| 04:40 | <@Kazriko> | It would execute once at 24 as well. |
| 04:40 | <@Kazriko> | it would stop at 25 |
| 04:40 | < SchoolPhox> | Right |
| 04:40 | < SchoolPhox> | I'm not having any luck on that front, though |
| 04:40 | < SchoolPhox> | I'll past the whole thing. Four lines |
| 04:41 | < SchoolPhox> | for(i = 12; i <= 24; i++) { bitstream[i] = (digital_output >> bit_mask) & 1; bit_mask--; } |
| 04:41 | < SchoolPhox> | It loops indefinitely. i reaches 24, and resets to 0 |
| 04:41 | < Tarinaky> | What is i? |
| 04:41 | <@Kazriko> | Is there anything outside of that loop? |
| 04:42 | < SchoolPhox> | i is an int, and outside of the loop is just generic code. No while loops or anything |
| 04:42 | <@Derakon> | Yeah, why don't you paste the entire function here? http://paste.ubuntu.com/ |
| 04:43 | < SchoolPhox> | Yeah, I was about to do that |
| 04:43 | <@Derakon> | Because from what you've pasted there the only thing modifying i is the for loop, which shouldn't ever decrement it. So something else is going on. |
| 04:43 | | * Kazriko ponders. |
| 04:44 | < SchoolPhox> | http://paste.ubuntu.com/580428/ |
| 04:44 | <@Derakon> | The loop being lines 10-14, yes? |
| 04:44 | < SchoolPhox> | Yeah |
| 04:45 | < SchoolPhox> | Also, bad formatting in there. This is old code |
| 04:45 | <@Kazriko> | you have another loop using i there, resets it to 0 |
| 04:45 | | * SchoolPhox has gotten better |
| 04:45 | < SchoolPhox> | But, it doesn't even reach there |
| 04:45 | <@Derakon> | Lines 10-14 loop indefinitely? |
| 04:45 | < SchoolPhox> | I had a breakpoint on line 15. Never reaches it |
| 04:45 | < SchoolPhox> | Yeah, 10-14 |
| 04:45 | <@Derakon> | (Are you sure the version that's looping indefinitely is the same as the version you pasted?) |
| 04:46 | < SchoolPhox> | Just copied it in. Oddly enough, it works if I change the for loop to i < 24 |
| 04:46 | <@Derakon> | ... |
| 04:46 | < SchoolPhox> | I could work around this by using i < 25, for the same functionality, but that's a hack |
| 04:47 | <@Derakon> | So it loops indefinitely with a condition of "i <= 24", but it works fine with a condition of "i < 25"? |
| 04:48 | < SchoolPhox> | Hmm. Works for i < 24, but not i < 25. |
| 04:48 | < SchoolPhox> | That helps, a bit. |
| 04:48 | <@Derakon> | 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24. How long is that list? |
| 04:48 | < SchoolPhox> | Hang on, just testing quickly. Think I found it |
| 04:49 | <@Kazriko> | Ahh, index issue. |
| 04:49 | <@Kazriko> | accessing [24] on a 24 length array? |
| 04:49 | <@Derakon> | I don't see how an indexing issue could be causing i to reset unless you got very, very lucky with your memory layout. |
| 04:49 | <@Derakon> | But yeah. |
| 04:49 | < SchoolPhox> | Yeah |
| 04:49 | < SchoolPhox> | But, it looks like it |
| 04:49 | <@Kazriko> | Compilers tend to do wierd things when you exceed their boundaries. GCC on arm causes all kinds of issues. |
| 04:49 | < SchoolPhox> | And consistantly hit it, as well. |
| 04:50 | < Tarinaky> | Derakon: Add a superfluous line of code - if he stops being so lucky it was luck. |
| 04:50 | <@Kazriko> | I did compile it with gcc and it ran without issue, but I commented out all of the delay and dout stuff. |
| 04:52 | < SchoolPhox> | Hmm. Odd that the compiler didn't give me an error with that. |
| 04:52 | <@Derakon> | C/C++ compilers are perfectly happy to let you tromp around in memory so long as you don't step on anything restricted. |
| 04:52 | <@Derakon> | You created a bunch of variables at the beginning of the function; they're probably adjacent in memory. |
| 04:53 | <@Derakon> | So modifying off the end of the array could well end up changing one of the other variables' values. |
| 04:53 | <@Derakon> | Naturally not anything you'd want to rely on. |
| 04:53 | < Tarinaky> | If you put the compiler in Pedantic mode should catch errors like that tbh. |
| 04:53 | < Tarinaky> | *it should |
| 04:53 | <@Kazriko> | Derakon, The one for the vxworks on arm seems to pack things so tightly, that every time I step out of an array the OS crashes. heh |
| 04:54 | <@Kazriko> | which is why I do such long and involved unit tests on that platform... |
| 04:55 | < SchoolPhox> | Well, function runs. Doesn't do what I wanted it to do, but thanks for the hand, there |
| 04:55 | | * SchoolPhox packs up to get some sleep |
| 04:55 | <@Derakon> | Sleep well. |
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| --- Log closed Tue Mar 15 09:27:46 2011 |
| --- Log opened Tue Mar 15 09:28:08 2011 |
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| 21:43 | <@McMartin> | 'Some people, when confronted with numbers, think "I know, I'll add them with JavaScript." Now they have 1.99999999999997 problems.' |
| 21:44 | < gnolam> | :-) |
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| 21:59 | < Tarinaky> | McMartin: Reminds me of that rap song, "I've got 1.99999999999997 problems but the JavaScript ain't one." |
| 22:01 | <@McMartin> | 98.9999999997, surely~ |
| 22:01 | < Tarinaky> | I wasn't sure if the number was significant. |
| 22:01 | < gnolam> | The only rap I listen to is Public Enemy. All the other rap is so... inaccessible. Outside the class, anyway. |
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| --- Log closed Wed Mar 16 00:00:01 2011 |