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2015-02-25T03:16:37Z beach: Good morning everyone!
2015-02-25T03:17:23Z nyef: Hello beach.
2015-02-25T03:19:06Z akkad: morning beech
2015-02-25T03:19:11Z akkad: beach
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2015-02-25T03:26:31Z burtons: i hope tonite is the night I get Mezanno to actaully boot...
2015-02-25T03:26:59Z burtons: quite an impressive project. i've had lots of time to go though the source while I've been waiting
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2015-02-25T03:31:42Z akkad: yeah it's quite impressive
2015-02-25T03:31:51Z drmeister: Hello beach
2015-02-25T03:31:59Z beach: drmeister: Hi.
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2015-02-25T03:32:30Z akkad: burtons: size wise, it's quite impressive given how big a image files these days runs > 50MB
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2015-02-25T03:32:35Z burtons: i can't wait to actually use it
2015-02-25T03:32:49Z drmeister: I just responded to your email.  I need the invoke-instruction to implement funwind-protect.  Then I started playing with unwind-protect as try-catch and I think I see how to do it.
2015-02-25T03:32:54Z akkad: GNU/Mezanno
2015-02-25T03:32:59Z burtons: i've been trying to get it to boot for about 4 days now, always something goes wrong
2015-02-25T03:33:06Z loke: Who paintains cl-ppcre?
2015-02-25T03:33:13Z burtons: but i've learned quite a bit about the boot process
2015-02-25T03:33:18Z beach: drmeister: You don't need invoke-instruction to implement funwind-protect.
2015-02-25T03:33:31Z beach: drmeister: You just compile it on your old compiler.
2015-02-25T03:33:34Z akkad: burtons: yeah to see asm in CL is pretty impressive
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2015-02-25T03:33:55Z loke: akkad: like DISASSEMBLE?
2015-02-25T03:34:02Z drmeister: If I throw an exception in the protected-form code it will bypass the cleanup-form code.
2015-02-25T03:34:05Z burtons: the code is a bit confusing, but it's really readable and clean
2015-02-25T03:34:36Z beach: drmeister: I don't see how that is possible, given that there is an UNWIND-PROTECT in your FUNWIND-PROTECT.
2015-02-25T03:34:45Z burtons: i'm trying to figure out what 'wired' memory is
2015-02-25T03:35:01Z drmeister: Oh - I don't want to use my compiler and I have the try, landing-pad, invoke and cleanup instructions implemented.
2015-02-25T03:35:03Z burtons: there seems to be 'wired' and 'pinned', but i'm not familiar with the terms
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2015-02-25T03:35:15Z akkad: burtons: memory tht can't be gc'd?
2015-02-25T03:35:26Z beach: drmeister: If you don't want to use your compiler, then write it in C++.
2015-02-25T03:35:27Z akkad: or freed
2015-02-25T03:35:44Z beach: drmeister: It is not worth changing the entire Cleavir framework to implement a single function.
2015-02-25T03:35:49Z akkad: kernel pages relating to device drivers, or interrupt handlers typically do not want to be paged out
2015-02-25T03:35:55Z burtons: akkad: not sure
2015-02-25T03:35:57Z drmeister: I'm not asking to change the Cleavir framework.
2015-02-25T03:36:10Z akkad: burtons: from kernel terminology that's what it's used for
2015-02-25T03:36:13Z drmeister: I'm using the vanilla Cleavir framework.
2015-02-25T03:36:30Z burtons: akkad: you mean, that's what wired memory is?
2015-02-25T03:36:42Z akkad: the PIC needs an absolute address to call code. and if that code is paged out, that's a problem
2015-02-25T03:36:45Z burtons: akkad: I think that would be pinned, but i'm jus tguessing
2015-02-25T03:36:49Z akkad: AIX uses wired
2015-02-25T03:36:53Z beach: drmeister: Why is it important to you not to use your old compiler to compile FUNWIND-PROTECT?
2015-02-25T03:37:00Z akkad: I've seen BSD use the pinned term too
2015-02-25T03:37:14Z burtons: well mezzano uses both
2015-02-25T03:37:19Z burtons: mabye i should ask google
2015-02-25T03:37:30Z drmeister: Because my old compiler is my problem and the reason why I'm incorporating a new compiler.
2015-02-25T03:37:42Z beach: drmeister: We have a gazillion things that are more important to think about than to avoid using your old compiler for a single function.
2015-02-25T03:37:45Z akkad: maybe see the ISA docs and see what they mean on a given arch
2015-02-25T03:37:55Z beach: drmeister: It is just one single function.
2015-02-25T03:38:11Z beach: drmeister: And it does very little.
2015-02-25T03:38:19Z burtons: 'wired memory turns out to be memory "used by the OS [which] is pretty much untouchable'
2015-02-25T03:38:32Z burtons: according to a quick google
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2015-02-25T03:38:47Z beach: drmeister: Write it in C++ or assembler for now.  In a few years, when we have all the other things sorted out, you can think of doing it with Cleavir.
2015-02-25T03:39:12Z burtons: and pinned means never swapped
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2015-02-25T03:41:20Z beach: drmeister: Here is another possibility: Just do the AST by hand.  It does very little.  It just calls one function and if that function throws an exception, it calls a different function.
2015-02-25T03:41:21Z nyef: burtons: In Mezzano, "wired" means "must remain in memory", that is "won't be paged out" and "pinned" means "must stay at the same address", that is "won't be moved by the GC".
2015-02-25T03:42:20Z drmeister: I can implement this in Cleavir - I've essentially done it.  I just need to replace funcall-instructions with invoke-instructions in the code generated for the protected form.
2015-02-25T03:42:47Z beach: drmeister: The code generated for the protected form is just (funcall thunk1).
2015-02-25T03:44:23Z beach: drmeister: We are talking about implementing (defun funwind-protect (thunk1 thunk2) (unwind-protect (funcall thunk1) (funcall thunk2)))
2015-02-25T03:45:17Z drmeister: I get it - I saw through what you were telling me and I saw how to implement it with try-catch - something I've been banging my head against  wall for a couple of weeks.
2015-02-25T03:46:32Z drmeister: Look - I'll have to reset and think about it again.
2015-02-25T03:47:01Z beach: drmeister: That discussion is different from implementing FUNWIND-PROTECT.
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2015-02-25T03:47:28Z beach: drmeister: That discussion had to do with implementing the UNWIND-INSTRUCTION.
2015-02-25T03:48:01Z drmeister: Implementing FUNWIND-PROTECT is trivial.
2015-02-25T03:48:10Z beach: Yes, that's what I am saying.
2015-02-25T03:48:21Z beach: And you don't need any invoke instruction anywhere else.
2015-02-25T03:48:59Z drmeister: Fine.
2015-02-25T03:49:13Z beach: Did you think you needed invoke instructions elsewhere?
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2015-02-25T03:52:12Z nyef: burtons: Apparently the "wired" and "pinned" heap spaces are mark-sweep GC'd, while the normal spaces use some sort of two-space collector.
2015-02-25T03:59:08Z drmeister: Yes, for the try/catch for tagbody/go, block/return-from and catch/throw.
2015-02-25T03:59:52Z beach: drmeister: Oh?
2015-02-25T04:00:23Z drmeister: No?
2015-02-25T04:00:30Z beach: I don't see it.
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2015-02-25T04:01:00Z beach: I thought the invoke instruction was just needed for unwind-protect.
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2015-02-25T04:02:04Z burtons: nyef: thanks. i guess the definitions are different from normal usage
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2015-02-25T04:03:06Z drmeister: No, it is used in place of CALL when an exception is thrown in the function that you are calling and to divert the stream of execution to a block of code called a "landing-pad".  The "landing-pad" dispatches based on the type of the exception to different exception handlers.
2015-02-25T04:03:10Z burtons: damnit, page fault on unmapped page...again.  reboot and see if it works next time...
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2015-02-25T04:03:59Z drmeister: And INVOKE is like a CALL but it has two successors, one for the normal return and the second for the exceptional situation.
2015-02-25T04:04:09Z burtons: i wonder if that means it ran out of memory
2015-02-25T04:04:38Z beach: drmeister: OK, educate me.  Suppose I have (tagbody (ff (lambda () (go a))) a)
2015-02-25T04:04:43Z burtons sets his vm to 1024 this time just in case
2015-02-25T04:05:05Z beach: drmeister: Where in that code do you need the invoke instruction?
2015-02-25T04:10:24Z drmeister: beach: Not the best example - how about (tagbody (ff (lambda () (go a))) (print "foo") a (print "bar"))
2015-02-25T04:10:39Z beach: drmeister: Fine.
2015-02-25T04:10:59Z drmeister: You need an INVOKE instruction to invoke FF, otherwise it will print "foo" and then "bar"
2015-02-25T04:11:30Z beach: But you don't know what FF is doing.
2015-02-25T04:11:42Z drmeister: So?
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2015-02-25T04:12:13Z drmeister: Let me show you what that would look like with a try/catch
2015-02-25T04:14:17Z beach: drmeister: Just one question.  What is different about FF compared to other functions in that you need the invoke instruction to invoke it?
2015-02-25T04:14:48Z drmeister: https://gist.github.com/anonymous/04b5f40638edd49a5439
2015-02-25T04:15:25Z loke: drmeister: what language is that?
2015-02-25T04:15:47Z drmeister: What is different is that FF is called from within a TRY block and it may or may not throw an exception.
2015-02-25T04:15:57Z loke: it almost looks like C++, but ther []() construct is weird.
2015-02-25T04:15:57Z drmeister: loke: C++
2015-02-25T04:16:14Z burtons: loke: that's a C++ lambda
2015-02-25T04:16:18Z loke: oh
2015-02-25T04:16:24Z burtons: c++0x
2015-02-25T04:17:03Z drmeister: C++ has "lambda"'s - they are anonymous functions and the hottest thing since they were invented in 2011 for C++ - have you not heard of them?
2015-02-25T04:17:57Z drmeister: beach:  http://llvm.org/docs/LangRef.html#invoke-instruction
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2015-02-25T04:18:22Z drmeister: How else can flow of execution change due to a thrown exception?
2015-02-25T04:18:57Z beach: drmeister: I guess I must have missed that.  I was under the impression that INVOKE was only needed in order to implement unwind-protect.
2015-02-25T04:19:09Z drmeister: loke: Sorry - just to be clear - I'm being sarcastic
2015-02-25T04:19:45Z beach: drmeister: Now I understand that it is needed whether there is an unwind-protect or not.
2015-02-25T04:19:48Z loke: drmeister: I thought they were invented by Clojure.
2015-02-25T04:19:54Z drmeister: It's needed for that and for every call within a try {...} block that can possibly throw an exception.
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2015-02-25T04:24:16Z beach: drmeister: Can you just use invoke everywhere?
2015-02-25T04:25:09Z drmeister: You could - but every invoke needs a landing-pad and I'm pretty sure that landing-pads cost performance when exceptions are thrown.
2015-02-25T04:25:25Z drmeister: They are zero cost until an exception is thrown.
2015-02-25T04:25:44Z beach: So if you use invoke where no exception can ever be thrown, it has 0 cost?
2015-02-25T04:25:46Z drmeister: Other than the code space they take up.
2015-02-25T04:26:10Z drmeister: Yup, other than your code is a bit larger because of all the landing-pads.
2015-02-25T04:27:25Z drmeister: But when an exception is thrown the exception handling code has to search up the chain of landing pads for one that handles the type of the object that you threw as the exception.  That search takes time and the more landing pads there are the longer it takes.  So unnecessary landing pads cost performance when exceptions are thrown.
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2015-02-25T04:27:34Z beach: OK, let me think about it.  You are saying that whenever you have a function with an instruction that is a successor of an UNWIND-INSTRUCTION, whenever you invoke that enclosed function containing the UNWIND-INSTRUCTION, this has to be done with INVOKE rather than CALL?
2015-02-25T04:27:49Z drmeister: This is the stuff that I'm weighing in my head when I've been banging it against the wall trying to figure how to implement all of this.
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2015-02-25T04:28:27Z drmeister: Parsing...
2015-02-25T04:28:34Z beach: drmeister: ... and it has nothing to do with the presence or not of UNWIND-PROTECT.
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2015-02-25T04:30:14Z drmeister: That I can answer right away - it's not specific to UNWIND-PROTECT.  It's the try { protected-code } catch (...) {catch-code}.   Any function calls in the protected-code that can throw an exception caught by the "catch" clause has to be called using the llvm "invoke" instruction rather than the llvm "call" instruction.
2015-02-25T04:31:09Z drmeister: What you said above is not quite what I'm saying.
2015-02-25T04:31:18Z beach: drmeister: So it is not a question of detecting whether you are inside the protected form of UNWIND-PROTECT as you said in your email.
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2015-02-25T04:32:40Z beach: drmeister: How are they different?
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2015-02-25T04:33:06Z drmeister: It was a question of detecting whether I am inside the protected form of UNWIND-PROTECT as I said in my email.   But it's more general than that.  It's a question of how do I convert every "call" within the protected code of a try {...} block to an "invoke".
2015-02-25T04:33:48Z drmeister: Say I have a function that is going to invoke an UNWIND-INSTRUCTION (or in C++ parlance, throw an exception).
2015-02-25T04:34:28Z drmeister: I can call it from outside of a try {...} block with the "call" instruction.   In that case there is no catch clauses to catch it so it doesn't need "invoke".
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2015-02-25T04:35:54Z drmeister: I can call it from inside of a try {...} block with a call instruction if that try {...} block doesn't have any catch (...) {...} clauses that match the exception thrown - again there is nothing to catch the exception so I don't need invoke - but I think even clang fails to do this optimization (I'm not certain of this though).
2015-02-25T04:36:49Z drmeister: But if I call it from a try {...} block that has a catch (...) {...} clause that matches the exception that I'm going to throw - then I better call it with "invoke" or the exception will not be caught by the intended catch clause.
2015-02-25T04:37:04Z beach: I get it.
2015-02-25T04:37:48Z nyef: But this only applies to the first level of CALLs within an UNWIND-PROTECT?
2015-02-25T04:38:08Z drmeister: Right - so you see, it's not that I don't understand funwind-protect.  I'm juggling a lot of stuff in my head at the same time.  I really appreciate your taking the time yesterday to explain funwind-protect and especially that the unwind-instruction only needs to unwind to a function and then jump to an instruction in that function.
2015-02-25T04:38:10Z beach: nyef: No.
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2015-02-25T04:38:17Z drmeister: That really, really cleared things up for me overnight.
2015-02-25T04:38:26Z drmeister: nyef: Parsing...
2015-02-25T04:38:45Z beach: nyef: It applies to UNWIND-PROTECT, but since UNWIND-PROTECT is implemented as a function, that is only in one single place.
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2015-02-25T04:39:07Z drmeister: nyef: No, it is all calls that are made directly from within the try {...} block that gets wrapped around the protected code of the unwind-protect.
2015-02-25T04:39:16Z beach: nyef: But it also applies when there is a lexical non-local control transfer like GO or RETURN-FROM.
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2015-02-25T04:39:36Z nyef: Ugh.
2015-02-25T04:39:38Z drmeister: Yes.
2015-02-25T04:39:42Z drmeister: Yes, yes, yes.
2015-02-25T04:39:48Z beach: nyef: So when there is something like (tagbody (ff (lambda () (go a)) a))
2015-02-25T04:40:24Z beach: nyef: Because drmeister implements non-local control transfers with C++ exceptions.
2015-02-25T04:40:49Z nyef: So it applies to all calls within an environment with an active non-local entry point.
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2015-02-25T04:41:13Z drmeister: nyef: Yes, that is another way to put it.
2015-02-25T04:41:14Z beach: "entry point"?
2015-02-25T04:41:34Z drmeister: "entry point" == catch (...) {...} clause.
2015-02-25T04:41:42Z beach: nyef: "target of a control transfer"?
2015-02-25T04:41:46Z nyef: Sorry, "exit point", per CLHS 5.2.
2015-02-25T04:41:52Z beach: Yes, I agree.
2015-02-25T04:42:00Z drmeister: So do I.
2015-02-25T04:42:02Z nyef: But it's specifically lexical, not dynamic.
2015-02-25T04:42:09Z beach: Yes, just lexical.
2015-02-25T04:42:11Z drmeister: What does that mean?
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2015-02-25T04:42:28Z nyef: It means that you can figure it out at compile time. d-:
2015-02-25T04:43:09Z drmeister: Yes - that's what I've been trying to figure out for a couple of weeks now.
2015-02-25T04:43:14Z drmeister: I think I have it now.
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2015-02-25T04:44:17Z beach: nyef: It is straightforward to detect.  In HIR, a non-local control transfer is explicitly indicated by an UNWIND-INSTRUCTION.
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2015-02-25T04:45:06Z drmeister: beach: So do you see now why I want to convert funcall-instructions to invoke-instructions when they are in the body of a try {...} block.
2015-02-25T04:45:41Z nyef: But the question isn't finding where the transfers come from, some of them may not even be lexical exits, what matters is that the exit itself is established within the lexical environment.
2015-02-25T04:45:48Z beach: drmeister: Yes, but you confused me by saying it had something to do with UNWIND-PROTECT.  It doesn't.  It has to do with the presence or not of an UNWIND-INSTRUCTION.
2015-02-25T04:46:24Z nyef: beach: So if I use CATCH, there will be an UNWIND-INSTRUCTION for it, even if the THROW is in another function, or compiled far, far later?
2015-02-25T04:48:05Z drmeister: I'm not sure I understand I convert funcall-instruction to invoke-instruction based on if the funcall-instruction is within a try {...} block - whether the invoke-instruction can invoke and unwind-instruction is less important.
2015-02-25T04:48:15Z beach: nyef: You can think of CATCH as being implemented with a function containing (lambda () (go xxx)), so yes, then there will be an unwind-instruction in it.
2015-02-25T04:49:08Z nyef: Hrm. You actually instantiate that at compile-time for the CATCH?
2015-02-25T04:49:11Z drmeister: beach: Not quite.
2015-02-25T04:49:29Z drmeister: The catch is there regardless if there is a function containing (lambda () (go xxx))
2015-02-25T04:50:01Z beach: nyef: Think of catch as being a macro that expands to a call to FCATCH.
2015-02-25T04:50:07Z beach: nyef: Problem solved.
2015-02-25T04:50:35Z beach: drmeister: You are talking about different catches.
2015-02-25T04:50:38Z beach: [I think]
2015-02-25T04:50:50Z beach: I think nyef is talking about CL:CATCH.
2015-02-25T04:50:58Z beach: And you are talking about C++ catch.
2015-02-25T04:50:58Z nyef: Yeah, CL:CATCH.
2015-02-25T04:51:07Z drmeister: Oh - sorry - rereading.
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2015-02-25T04:52:58Z beach: drmeister: Let's say F is a function that is the owner of an instruction that is the successor of an UNWIND-INSTRUCTION.
2015-02-25T04:53:14Z drmeister: Ok,
2015-02-25T04:53:32Z beach: drmeister: Let's say G is a function called by F and G is the one containing that UNWIND-INSTRUCTION.
2015-02-25T04:53:50Z beach: Then when F calls G it has to be done by LLVM INVOKE instruction.
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2015-02-25T04:54:12Z drmeister: parsing...
2015-02-25T04:54:25Z drmeister: F contains the UNWIND-INSTRUCTION?
2015-02-25T04:54:31Z drmeister: Or G?
2015-02-25T04:54:34Z beach: G does.
2015-02-25T04:54:49Z beach: directly or indirectly.
2015-02-25T04:54:52Z drmeister: Oh, the successor of the UNWIND-INSTRUCTION is in another function.
2015-02-25T04:55:00Z drmeister: Right.
2015-02-25T04:55:03Z drmeister: Hang on...
2015-02-25T04:55:10Z beach: The successor of the UNWIND-INSTRUCTION is an instruction owned by F.
2015-02-25T04:56:35Z drmeister: Yes, when F calls G it has to be done by an LLVM INVOKE instruction and there has to be a landing pad compiled within F.
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2015-02-25T04:56:47Z beach: drmeister: Exactly.
2015-02-25T04:57:02Z drmeister: Did I just contradict myself from previously?
2015-02-25T04:57:16Z beach: I don't care.
2015-02-25T04:57:29Z drmeister: Neither do I - I say all sorts of shit all the time.
2015-02-25T04:57:32Z beach: As long as we agree that this is the situation we need to detect.
2015-02-25T04:57:32Z drmeister: :-)
2015-02-25T04:57:39Z drmeister: Yes, we agree.
2015-02-25T04:58:28Z macmathis: akkad: do you have a git repo for those mods? I'd like to see CL in the kernel :P
2015-02-25T04:59:11Z drmeister: Ok, here's funwind_protect:
2015-02-25T04:59:26Z beach: drmeister: Forget about FUNWIND-PROTECT.
2015-02-25T04:59:38Z drmeister: https://gist.github.com/anonymous/10a1c2b8b119ac1f5eac
2015-02-25T05:00:05Z drmeister: Ok - wanna see what I've got for UNWIND-PROTECT?
2015-02-25T05:01:02Z beach: I don't know much about C++ exceptions, but don't you need to throw the exception again in the handler?
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2015-02-25T05:02:20Z drmeister: Yes - for Common Lisp exceptions - if the UNWIND-INSTRUCTION target doesn't match the one the catch (...) {...} is looking for then it needs to be rethrown.
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2015-02-25T05:02:47Z drmeister: Now I don't want a target function, I want the unwind-instruction to point to a target try {...} block.
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2015-02-25T05:03:23Z beach: drmeister: You keep changing the subject.  Whenever I talk about UNWIND-INSTRUCTION you change the subject to UNWIND-PROTECT, and whenever I agree to discuss UNWIND-PROTECT, you change back to UNWIND-INSTRUCTION.
2015-02-25T05:03:37Z drmeister: Sorry, I'm a very non-linear thinker.
2015-02-25T05:03:47Z drmeister: What is the subject?
2015-02-25T05:04:40Z beach: Since you didn't follow my advice "forget about unwind-protect", I agreed to look at your code for funwind_protect.  And I was saying, don't you need to re-throw the exception there?
2015-02-25T05:05:41Z beach: ... in case there are dynamically nested UNWIND-PROTECTs.
2015-02-25T05:06:55Z drmeister: You are correct - that would explain why it produced the strange output that it did in my test case - I was just puzzling over that.
2015-02-25T05:07:15Z drmeister: See this:
2015-02-25T05:07:18Z drmeister: https://www.irccloud.com/pastebin/WgKER6FE
2015-02-25T05:07:40Z drmeister: The "t-b" shouldn't be in the output - I think it's because I'm not rethrowing the exception.
2015-02-25T05:07:45Z drmeister: Hang on.
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2015-02-25T05:08:30Z drmeister: I coded this in a hurry and then we got into the conversation we just had.
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2015-02-25T05:14:05Z beach: drmeister: Correct me if I am wrong:  It is when F calls G that you need to decide to use the LLVM INVOKE instruction.  You don't need anything special to generate code for F itself other than that.  Yes?
2015-02-25T05:16:06Z drmeister: Ok, that fixed it.
2015-02-25T05:16:09Z drmeister: https://www.irccloud.com/pastebin/D9yxrRN7
2015-02-25T05:16:54Z drmeister: https://gist.github.com/anonymous/13ee2ff2f4ef252c2a41
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2015-02-25T05:17:43Z drmeister: I need to generate landing pad code for the INVOKE to branch to on an exception.
2015-02-25T05:17:55Z beach: Right.
2015-02-25T05:18:05Z drmeister: But I created a landing-pad-instruction - so that's no problem.
2015-02-25T05:18:25Z beach: In HIR?
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2015-02-25T05:20:36Z beach: I need a break.  I'll be back in 30 minutes or so.
2015-02-25T05:20:52Z drmeister: Yes.
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2015-02-25T05:21:12Z drmeister: But I need to change the funcall-instructions to invoke-instructions in the protected code.
2015-02-25T05:21:25Z drmeister: Otherwise you can't see them because nothing points to them.
2015-02-25T05:21:54Z drmeister: I guess I'm not going to bed for a while (sigh).
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2015-02-25T05:53:34Z beach: drmeister: I will send you some code that will let you change the funcalls to invokes when necessary.
2015-02-25T05:53:49Z drmeister: Thank you.
2015-02-25T05:54:07Z drmeister: Would invoke-instruction have to inherit from something other than call-instruction because it has two successors?
2015-02-25T05:54:09Z beach: drmeister: Go to sleep.  I'll deal with it.
2015-02-25T05:54:22Z beach: drmeister: I'll think about it.
2015-02-25T05:54:36Z drmeister: Ok, I'm wiped out as well - I'll talk to you tomorrow.
2015-02-25T05:54:38Z beach: I have a pretty good idea of what you need.
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2015-02-25T05:54:50Z drmeister: Thank you - I appreciate it very much.
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2015-02-25T05:59:59Z sz0` is now known as sz0
2015-02-25T06:00:30Z sz0 is now known as sz0`
2015-02-25T06:03:55Z drmeister: I have trouble letting go:
2015-02-25T06:04:15Z drmeister: (hoisted-hir-form '(lambda () (unwind-protect (progn (print "p1") (print "p2")) (print "Cleanup"))))
2015-02-25T06:04:29Z drmeister: http://i.imgur.com/PtHoJpP.png
2015-02-25T06:04:35Z drmeister: beach: Ping
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2015-02-25T06:04:40Z beach: I'm here.
2015-02-25T06:04:43Z drmeister: I'm going to bed now.
2015-02-25T06:05:28Z drmeister: But fyi - I did something I hate - I copied compile-ast specialized on call-ast and rewrote it to insert invoke or funcall depending if *landing-pad* was set up or not.
2015-02-25T06:05:51Z drmeister: This HIR contains a try,  landing pad and a cleanup clause.  It's a prototype for what I'm talking about.
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2015-02-25T06:07:31Z beach: There should not be a landing pad or a try in there because there is no non-local control transfer.
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2015-02-25T06:10:11Z drmeister: If PRINT failed for some reason or was replaced by some other function that did throw an exception then they would need to be there wouldn't they?   This is a prototype.   I think I need to rethrow the exception as well.
2015-02-25T06:10:48Z beach: *sigh*  Let's talk about this some other time.
2015-02-25T06:12:51Z loke: drmeister: Replacing PRINT is undefined behaviour thoug
2015-02-25T06:15:07Z drmeister: The PRINT was a bad choice.   Substitute FOO for PRINT.
2015-02-25T06:15:20Z drmeister: I'm off to bed - really - I'll stop now.
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