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2014-09-19T10:26:47Z Krystof: krzysz00: are you here?
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2014-09-19T11:23:40Z H4ns: is there a way to access the returned value(s) of a function sbcl trace's :condition-after option?
2014-09-19T11:23:45Z H4ns: i.e. i'd like to trace invocations only if the result was, say, nil
2014-09-19T11:24:23Z flip214: (setf) into a *global*?
2014-09-19T11:25:10Z H4ns: flip214: kind of the point of trace is that one does not need to modify the source code in order to gather information
2014-09-19T11:26:38Z flip214: H4ns: I thought you wanted to access the value of the :condition-after?
2014-09-19T11:27:01Z flip214: "(trace :condition-after (setf *global* ...) ...)" doesn't sound like a source change to me.
2014-09-19T11:27:25Z H4ns: flip214: i want to check whether the traced function returned some particular value and return true in that case, causing the invocation to be traced.
2014-09-19T11:28:29Z flip214: sb-debug:*trace-values* perhaps?
2014-09-19T11:28:51Z H4ns: what is that?
2014-09-19T11:29:10Z flip214: wait, what? if it returns something, *then* trace? sounds backwards to me. perhaps I'm especially dumb today, though.
2014-09-19T11:29:21Z flip214:   "This is bound to the returned values when evaluating :BREAK-AFTER and
2014-09-19T11:29:21Z flip214:    :PRINT-AFTER forms.")
2014-09-19T11:29:33Z H4ns: let me try that
2014-09-19T11:29:51Z flip214: it's good to have a checkout and grep ;)
2014-09-19T11:30:17Z H4ns: i'm old fashioned and trust in documentation.
2014-09-19T11:30:56Z flip214: in-image documentation, or the on-paper kind?
2014-09-19T11:31:07Z H4ns: nice, thanks!
2014-09-19T11:31:26Z H4ns: on-webpage documentation.  i was looking at http://www.sbcl.org/manual/#Function-Tracing and did not find it mentioned there.
2014-09-19T11:31:38Z flip214: you're welcome! after all that time *I* could help *you* once, that feels really good.
2014-09-19T11:32:07Z H4ns: now, how do i remember this for the next time i need it?  :)
2014-09-19T11:32:36Z H4ns: ah, damn
2014-09-19T11:33:02Z H4ns: i should have just read the whole documentation, it is all there, after untrace and the other documented sb-debug variables
2014-09-19T11:33:06Z H4ns: thanks anyway! :)
2014-09-19T11:33:20Z H4ns: but:
2014-09-19T11:33:33Z flip214: there's always a "but"....
2014-09-19T11:33:39Z H4ns: it does not print the function arguments, just the returned value, so it is not useful :(
2014-09-19T11:34:26Z H4ns: (to me, ymmv etc).
2014-09-19T11:34:42Z H4ns: anyway, back to work. :)
2014-09-19T11:36:21Z flip214: H4ns: I did use trace at one time:
2014-09-19T11:36:35Z flip214: no, I didn't use trace.
2014-09-19T11:36:40Z flip214: sb-int:encapsulate
2014-09-19T11:36:42Z flip214: is what I used.
2014-09-19T11:37:00Z flip214: This way I get the args, can call the original function myself, and then print anything I want.
2014-09-19T11:37:25Z flip214: (sb-int:encapsulate 'package:function #'my-wrapper)
2014-09-19T11:37:45Z flip214: and the wrapper gets the original function as first argument...
2014-09-19T11:37:50Z flip214: do you need anything else?
2014-09-19T11:38:10Z H4ns: i need it in a form that does not require me to program a function wrapper
2014-09-19T11:38:30Z H4ns: because that'll most likely be more involved than adding a few print statements :)
2014-09-19T11:38:47Z H4ns: maybe i should write a trace-if-returning macro for that
2014-09-19T11:39:02Z H4ns: but enough of the yak shaving, thank you for your help!
2014-09-19T11:39:14Z flip214: the wrapper is (let ((res (m-v-l (funcall orig))) ...)
2014-09-19T11:39:32Z flip214: ie. there's nearly nothing to it.
2014-09-19T11:39:50Z flip214: nice weekend, too!
2014-09-19T11:39:51Z H4ns: except a dozen parenthesis and thinking required to get it right.
2014-09-19T11:41:01Z flip214: *you*, as a seasoned lisp programmer, won't even notice the parenthesis.
2014-09-19T11:41:17Z flip214: and the thinking is so easy that even I could get it working - all 3 lines!
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2014-09-19T14:23:01Z Xach: Hi friends. Can someone with recent sbcl try quickloading drakma-async? I get an error that I don't understand.
2014-09-19T14:23:44Z eudoxia: it loaded fine on 1.2.2
2014-09-19T14:23:50Z Xach scratches head
2014-09-19T14:24:19Z pkhuong: Xach: can you lisppaste the error?
2014-09-19T14:24:50Z Xach: http://report.quicklisp.org/drakma-async/2014-09-19/failtail.txt has a copy of it
2014-09-19T14:31:35Z Krystof: that might be backquote-related
2014-09-19T14:31:51Z Krystof: hm, it shouldn't be though
2014-09-19T14:33:06Z Krystof: is there a way I can look at the drakma-async sources that you're compiling quickly and easily?
2014-09-19T14:35:00Z Xach: https://github.com/orthecreedence/drakma-async.git is the repo, https://github.com/orthecreedence/drakma-async will browse them.
2014-09-19T14:36:18Z reb`: Xach: Loaded fine for me with sbcl 1.2.3
2014-09-19T14:37:03Z Xach: I am using 1.2.2.92-82e7570. I should update before wasting more time.
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2014-09-19T15:36:55Z 
2014-09-19T15:36:55Z names: ccl-logbot Perlboy p_l|backup jackdaniel brucem_ faheem mood_ qbit_ yacks loke_ krzysz00 karswell` tmh_ reb`` @Krystof Xach yauz_2 drmeiste_ DGASAU eudoxia oleo dkcl scymtym Hydan hlavaty segv- fridim__ slyrus leo2007 christoph_debian prxq psilord Bike Intensity milosn kanru p_l flip214 antoszka jdz Posterdati angavrilov PuercoPop luis akkad redline6561 pchrist fe[nl]ix Blkt alchemis7 foom nicdev pkhuong carvite thoto_ |3b| zacts asedeno les ivan``
2014-09-19T15:36:55Z names: cracauer_ ams minion specbot jsnell loke ferada phf leoc heddwch sobel White_Flame irsol
2014-09-19T15:37:20Z qbit_ is now known as qbit
2014-09-19T15:37:40Z Krystof: |3b| can probably cook something up with map-backtrace
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2014-09-19T15:41:17Z |3b|: ah, (setf sb-debug:*stack-top-hint* 'sb-debug::invoke-interruption) lets me see it in slime debugger
2014-09-19T15:41:31Z Krystof: nice
2014-09-19T15:41:51Z Krystof: I have learnt something today
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2014-09-19T15:43:49Z |3b| wonders if this is a more extreme case of that bad source location bug from other day
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2014-09-19T15:47:08Z Krystof: oh but of course attempting to list locals gives be a failure to look up source
2014-09-19T15:47:09Z Krystof: *sigh*
2014-09-19T15:48:10Z |3b|: can see them in slime debugger
2014-09-19T15:53:44Z Krystof: ok, wait
2014-09-19T15:54:18Z Krystof: we have something that replaces bits of code with other bits of code
2014-09-19T15:54:44Z |3b|: CHUNGA:WITH-CHARACTER-STREAM-SEMANTICS maybe?
2014-09-19T15:54:58Z Krystof: so some bits of the original code get replaced by other bits, which might not have any kind of relationship in form terms to the original bits
2014-09-19T15:56:49Z Krystof: and _literal_ (eq) bits of that form might get moved around
2014-09-19T15:58:28Z |3b|: ah, maybe DRAKMA-ASYNC::REWRITE-HTTP-REQUEST
2014-09-19T15:59:35Z |3b|: https://github.com/orthecreedence/drakma-async/blob/master/rewrite.lisp
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2014-09-19T16:02:29Z |3b|: yeah, (DRAKMA-ASYNC::REWRITE-HTTP-REQUEST (DEFUN foo () (CHUNGA:WITH-CHARACTER-STREAM-SEMANTICS (progn (/ 1 0))))) is enough to duplicate it
2014-09-19T16:02:55Z Krystof: what I think is going on is the source path printer is descending the source tree, and then hitting an atomic backquote/comma where it's expecting a form
2014-09-19T16:06:00Z Krystof: |3b|: since you're way ahead of me, you could change the aver in find-original-source to an assert
2014-09-19T16:06:17Z Krystof: well, no, that's not that interesting
2014-09-19T16:08:27Z Krystof: you could change the aver to (assert (or (null current) form))
2014-09-19T16:08:38Z Krystof: and then the error message in the debugger might be more informative
2014-09-19T16:11:05Z |3b|: nope, not really more informative, just assertion failed
2014-09-19T16:12:10Z Krystof: doesn't it print information about the values?
2014-09-19T16:12:29Z |3b| can see the values in debugger if you want them
2014-09-19T16:12:41Z Krystof: actually I have to go and cook
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2014-09-19T16:21:47Z Krystof: so, annoyingly, this thing is invoking undefined behaviour (it's modifying literal code)
2014-09-19T16:22:07Z Krystof: but if you can reproduce it with just with-character-stream-semantics, I think that that branch isn't in fact doing the really naughty thing
2014-09-19T16:22:25Z |3b|: it needs both macros
2014-09-19T16:22:54Z |3b|: though the inner one might only be needed to trigger the outer one
2014-09-19T16:23:04Z |3b|: not sure if the changes it makes matter as well or not
2014-09-19T16:23:52Z Krystof: sure, you need the outer rewrite-foo macro
2014-09-19T16:24:10Z Krystof: that's the thing that actually does the naughtiness
2014-09-19T16:24:56Z Krystof: oh, wait, I'm an idiot
2014-09-19T16:27:48Z |3b|: ok, looks like it is modification of the literal
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2014-09-19T16:31:11Z Krystof: how?  the rewrite for with-character-stream-semantics doesn't do any, or does it?
2014-09-19T16:31:30Z |3b|: i think it does
2014-09-19T16:31:50Z Krystof: it setqs defun-form, but that's fine, that's a lexical
2014-09-19T16:31:50Z |3b|: at least modifying literals does have that effect
2014-09-19T16:34:26Z Krystof: oh, heck, tree-search-replace modifies
2014-09-19T16:35:18Z Krystof: there's a moral here
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2014-09-19T16:36:00Z Krystof: I think it might be "take people who write clever macros and educate them, gently, about not aiming rocket-launchers at other peoples' feet"
2014-09-19T16:36:04Z Krystof really goes to cook
2014-09-19T16:36:30Z |3b|: http://paste.lisp.org/+32XU standalone version, fwiw
2014-09-19T16:37:20Z Krystof: yeah, but now that we've established that this is someone else's fault, the minimal reproducible example is less interesting :-)
2014-09-19T16:37:38Z Krystof: thank you, though
2014-09-19T16:37:57Z |3b|: yeah, just a wishlist bug to handle it better now
2014-09-19T16:39:24Z faheem: so did you guys figure out the problem? Not really following the preceding. it's a bug?
2014-09-19T16:39:53Z |3b|: faheem: the user code has a macro that does bad things, which confused sbcl
2014-09-19T16:40:11Z |3b|: specifically, it has a macro which destructively modifies its arguments
2014-09-19T16:40:35Z faheem: user code from the library?
2014-09-19T16:40:42Z |3b|: and destructively modifying literals is undefined behavior, so not technically a bug in sbcl, though possibly something worth handling more nicely
2014-09-19T16:40:43Z |3b|: right
2014-09-19T16:41:13Z faheem: ok. so what is the procedure in that case? filing a bug and not accepting the update?
2014-09-19T16:41:54Z |3b|: 'procedure' from sbcl's point of view? ignore it or file a 'wishlist' level bug on launchpad and then ignore it
2014-09-19T16:42:13Z faheem: |3b|: from QL's pov
2014-09-19T16:42:18Z |3b|: possibly someone could file a bug on the user code saying 'don't do that" as well
2014-09-19T16:42:46Z |3b|: same options from QL's point of view
2014-09-19T16:43:04Z faheem: |3b|: this is user code that is part of the library? not clear what user code means here
2014-09-19T16:43:10Z |3b|: the problem was triggered by another bug in the user code, which i think Xach may have already filed
2014-09-19T16:43:27Z |3b|: "user code" in this case is anything not part of sbcl
2014-09-19T16:43:38Z faheem: |3b|: i see
2014-09-19T16:43:48Z |3b|: specifically the DRAKMA-ASYNC::REWRITE-HTTP-REQUEST macro in drakma-async
2014-09-19T16:43:59Z faheem: |3b|: i see.
2014-09-19T16:44:05Z |3b|: is the part that does the undefined behavior
2014-09-19T16:44:26Z faheem: surprised this hasn't been picked up already
2014-09-19T16:44:40Z faheem: thanks for the clarification
2014-09-19T16:45:18Z |3b|: only visibly broken when there is a compile-time warning/error in the code it modifies, so won't affect normal use
2014-09-19T16:45:34Z |3b|: (though still technically broken even if it happens to work normally)
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2014-09-19T16:50:26Z faheem: |3b|: wouldn
2014-09-19T16:50:48Z faheem: wouldn't such a warning/error happen much or all of the time?
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2014-09-19T16:55:05Z |3b|: the BUG/AVER happened during reporting of a warning
2014-09-19T16:55:23Z |3b|: so if compilation of the code doesn't WARN, the BUG/AVER isn't triggered
2014-09-19T16:57:21Z |3b|: possibly even needs to be in specific positions relative to the modifications to actually trigger the AVER as opposed to just getting the source location wrong
2014-09-19T16:57:31Z Xach: darn, there are a bunch of other projects that are broken today with the latest sbcl.
2014-09-19T16:57:35Z Xach: looks walker-related
2014-09-19T16:58:21Z Xach: esrap-liquid, cl-read-macro-tokens, cl-yaclyaml
2014-09-19T16:58:27Z Xach: "bunch" here meaning "three"
2014-09-19T16:58:44Z hlavaty: Xach: does iterate work for you?
2014-09-19T16:58:52Z Xach: http://report.quicklisp.org/cl-yaclyaml/2014-09-19/failtail.txt http://report.quicklisp.org/cl-read-macro-tokens/2014-09-19/failtail.txt
2014-09-19T16:58:57Z Xach: hlavaty: to the extent that it builds, yes.
2014-09-19T16:59:32Z hlavaty: ok thanks
2014-09-19T17:11:16Z |3b|: Xach: that's on sbcl HEAD?
2014-09-19T17:13:47Z Xach: |3b|: yes
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2014-09-19T17:31:22Z |3b|: Xach: cl-read-macro-tokens broke due to changes in sbcl internals it relied on
2014-09-19T17:32:50Z Xach: oh
2014-09-19T17:32:56Z Xach can't report it at the moment
2014-09-19T17:33:13Z |3b|: https://github.com/sbcl/sbcl/commit/bdfbf52d52fd7f544f2983466ea34a5a54e95e3e#diff-442ad7c27132471fbcc24f2830b7b1b9L697 is the specific change
2014-09-19T17:33:40Z |3b|: looks like other 2 broke due to using that lib
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2014-09-19T17:41:17Z faheem: does sbcl have a declared API?
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2014-09-19T17:44:01Z |3b| filed https://bugs.launchpad.net/sbcl/+bug/1371719 for the BUG/AVER thing with macro modifying literals, if someone wants to flag it 'wishlist'
2014-09-19T17:44:15Z |3b| doesn't seem to be able to adjust that
2014-09-19T17:49:19Z foom: It sure would be nice if sbcl put compiled literals in unwritable memory.
2014-09-19T17:49:50Z |3b|: is it 'compiled' at that point?
2014-09-19T17:50:23Z |3b|: though would be useful in other cases
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2014-09-19T17:52:10Z foom: Oh i misread, it actually aborts in compile-file itself. :)
2014-09-19T17:52:26Z |3b|: yeah
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2014-09-19T18:10:00Z Krystof: thanks, |3b|
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