- Cvs-hugs - Haskell.org

RE: cvs commit: hugs98/lib Prelude.hs hugs98/lib/exts Exception.hs ConcBase.hs
by Simon Marlow 02 Apr '01

02 Apr '01

> One big difference is that, because IOError handling is handled > separately from HugsExceptions, we can't readily implement > > throw :: Exception -> a > > But we can provide > > throwIO :: Exception -> IO a > > (which I'll try to persuade the GHC people to ask to their > implementation). This is called 'ioError' in GHC, because the Exception type is now a synonym for IOError (in GHC 5.00). This makes it easier to port code that uses IOErrors to use Exceptions - the Exception interface is just an extension of the existing IOError interface. Cheers, Simon

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RE: cvs commit: hugs98/src builtin.c
by Simon Marlow 02 Apr '01

02 Apr '01

> reid 2001/04/01 21:24:13 PDT > > Modified files: > src builtin.c > Log: > This is a bogus commit because I just accidentally > committed all files > instead of just machdep.c (and I can't remember the cvs > magic to undo > it). $ cvs up -j<new> -j<old> <file1> $ cvs up -j<new> -j<old> <file2> $ etc. $ cvs commit -m "undo bogus commit" <file1> <file2> ... where <new> and <old> are the new and old revisions of the file (eg. if the last commit was revision 1.3, then <new>=1.3 and <old>=1.2). Alternatively, use a "forced commit" (cvs commit -f) to add the correct log message to each of the committed files. Cheers, Simon

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cvs commit: hugs98/lib Prelude.hs hugs98/lib/exts Exception.hs ConcBase.hs
by Alastair Reid 02 Apr '01

02 Apr '01

reid 2001/04/01 21:51:23 PDT Modified files: lib Prelude.hs lib/exts ConcBase.hs Added files: lib/exts Exception.hs Log: Even if the previous commits are bad, things should still work because I haven't changed anything in the normal evaluation path. This set of commits had better work though! Prelude.hs: There's now two kinds of exception: IOError and HugsException. IOErrors are propagated using the normal continuation passing mechanisms - exception handlers are chained together on the heap. (This stuff is unchanged. Changing that would require changes to greencard and every IO primop in Hugs.) HugsExceptions are propagated using longjmp, etc. Exception handlers are piled up on the stack. But, what happens when we have to do a context switch (e.g., a call to Concurrency.yield or Concurrency.takeMVar)? We have to remember all the HugsException catches so that we can restore them when we switch back to that thread. This is what Hugs_Catch is for - it remembers which exception handlers we have to reinstall on the stack when we switch back to the thread. (btw, The type names, constructors, etc. associated with IOResult, etc. really ought to be renamed so they have the word "Hugs" or "prim" in them for the usual namespace-contamination reasons.) ConcBase.hs: Some minor organisation and layout changes - trying to restore a consistent style. Also, forkIO has to make sure that every thread contains both an IOError handler and HugsException handler. new file exts/Exceptions.hs: A (very) cut-down implementation of GHC's Exception module. One big difference is that, because IOError handling is handled separately from HugsExceptions, we can't readily implement throw :: Exception -> a But we can provide throwIO :: Exception -> IO a (which I'll try to persuade the GHC people to ask to their implementation). The other big difference is that GHC's Exception datatype has many constructors for different kinds of errors. Implementing this would require extensive changes to any primops which can raise exceptions - lots of changes. So, instead, you get a HugsException and you can convert it to a string and, if you see fit, try to parse the string. I didn't add GHC's assertions - so they're left out. Adding Dynamic exceptions looked tricky and didn't seem like a pressing need so I left them out. Revision Changes Path 1.7 +32 -1 hugs98/lib/Prelude.hs 1.3 +14 -9 hugs98/lib/exts/ConcBase.hs

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cvs commit: hugs98/src builtin.c
by Alastair Reid 02 Apr '01

02 Apr '01

reid 2001/04/01 21:24:13 PDT Modified files: src builtin.c Log: This is a bogus commit because I just accidentally committed all files instead of just machdep.c (and I can't remember the cvs magic to undo it). So here's what all those committed files did: interns.c: The old file interns.c (which is usually ifdef'd out) provides access to a bunch of Hugs internals. This provided a primitive: catchException2 :: a -> Either Cell a where Cell is an error object. The only change here is a fix to the implementation. It couldn't possibly work the way it was - which leaves me wondering what happened to it. builtin.c: Put a (fixed) copy of catchException2 here and added throwException data HugsException primitive primCatchException :: a -> Either HugsException a primitive primThrowException :: HugsException -> a Note that using these directly would break referential transparency. To fix that, one or the other (doesn't matter) ought to be in the IO monad. But there's difficult interactions with the thread implementation (that's what the fuss is about after all!) so we provide the unsafe versions here and wrap them up before exporting them. Incidentally, notice that these names (which have to be exported from the Prelude and so pollute the user's namespace) either include the word "hugs" or starts with the word "prim". printer.c: Added a primop for printing Hugs exception objects primitive primShowException :: HugsException -> String It originally had type: primitive primShowException :: HugsException -> ShowS but printDBadRedex ignores its second argument when printing error objects. Revision Changes Path 1.12 +3 -3 hugs98/src/builtin.c

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cvs commit: hugs98/src builtin.c interns.c machdep.c printer.c storage.h
by Alastair Reid 02 Apr '01

02 Apr '01

reid 2001/04/01 21:05:13 PDT Modified files: src builtin.c interns.c machdep.c printer.c storage.h Log: Minor cleanup to kill a gcc warning. If you use /* ... */ to comment out code that includes a comment, gcc will complain. If you use #if 0 ... #endif, to comment out code, it nests properly and gcc has no cause for complaint. Revision Changes Path 1.11 +43 -5 hugs98/src/builtin.c 1.5 +3 -3 hugs98/src/interns.c 1.15 +6 -4 hugs98/src/machdep.c 1.5 +16 -4 hugs98/src/printer.c 1.18 +2 -4 hugs98/src/storage.h

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cvs commit: hugs98/lib/exts IOExts.hs
by Alastair Reid 02 Apr '01

02 Apr '01

reid 2001/04/01 21:00:15 PDT Modified files: lib/exts IOExts.hs Log: Fixed style of error messages for consistency with Prelude and standard libraries. In error messages, we should use a legal qualified name like IOExts.fixIO not IOExts:fixIO (Incidentally, because of the way fixIO is implemented, calling fork in fixIO won't work too well: the call to fixIO can't terminate until all forked threads terminate. I think this can be fixed - though it might require changes in the thread implementation in the Prelude.) Revision Changes Path 1.3 +2 -2 hugs98/lib/exts/IOExts.hs

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cvs commit: hugs98/src input.c prelude.h
by nordland＠glass.cse.ogi.edu 21 Mar '01

21 Mar '01

nordland 2001/03/21 15:01:02 PST Modified files: src input.c prelude.h Log: Small fix that makes CWPro/Bison compile parser.y right out of the box. Revision Changes Path 1.25 +6 -2 hugs98/src/input.c 1.16 +6 -2 hugs98/src/prelude.h

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cvs commit: hugs98/src machdep.c
by nordland＠glass.cse.ogi.edu 19 Mar '01

19 Mar '01

nordland 2001/03/19 12:36:31 PST Modified files: src machdep.c Log: An attempt to obtain the correct behaviour of startEdit by applying yet another patch. Revision Changes Path 1.14 +12 -9 hugs98/src/machdep.c

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cvs commit: hugs98/src parser.y static.c
by nordland＠glass.cse.ogi.edu 19 Mar '01

19 Mar '01

nordland 2001/03/19 09:51:53 PST Modified files: src parser.y static.c Log: More from Sigbjorn: this fix allows qualified names in instance declarations. Revision Changes Path 1.15 +35 -4 hugs98/src/parser.y 1.33 +14 -6 hugs98/src/static.c

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cvs commit: hugs98/src hugs.c
by nordland＠glass.cse.ogi.edu 19 Mar '01

19 Mar '01

nordland 2001/03/19 09:45:58 PST Modified files: src hugs.c Log: Applied Sigbjorn's tweaks that flush the error stream and allow ~ in :cd commands. Revision Changes Path 1.36 +43 -7 hugs98/src/hugs.c

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cvs commit: hugs98/src static.c storage.c storage.h
by nordland＠glass.cse.ogi.edu 19 Mar '01

19 Mar '01

nordland 2001/03/19 09:43:41 PST Modified files: src static.c storage.c storage.h Log: Added Sigbjorn's fix for the import-with-hiding/export problem. Revision Changes Path 1.32 +87 -22 hugs98/src/static.c 1.15 +4 -2 hugs98/src/storage.c 1.17 +11 -2 hugs98/src/storage.h

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FREE Biotech Stock Info! 117
by biotechstox93＠earthlink.net 10 Mar '01

10 Mar '01

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cvs commit: hugs98 Readme
by nordland＠glass.cse.ogi.edu 20 Feb '01

20 Feb '01

nordland 2001/02/20 13:44:10 PST Modified files: . Readme Log: Made the necessary Feb 2001 changes to this forgottten file. Revision Changes Path 1.11 +18 -7 hugs98/Readme

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cvs commit: hugs98/lib/hugs HugsDynamic.hs
by nordland＠glass.cse.ogi.edu 16 Feb '01

16 Feb '01

nordland 2001/02/16 20:06:25 PST Modified files: lib/hugs HugsDynamic.hs Log: Cleaned up some printouts. Revision Changes Path 1.3 +4 -3 hugs98/lib/hugs/HugsDynamic.hs

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cvs commit: hugs98/src runhugs.c
by nordland＠glass.cse.ogi.edu 16 Feb '01

16 Feb '01

nordland 2001/02/16 20:05:50 PST Modified files: src runhugs.c Log: Fixed runhugs' inability to run main :: IO a where a /= (). Revision Changes Path 1.4 +14 -26 hugs98/src/runhugs.c

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cvs commit: hugs98/lib/hugs HugsDynamic.hs
by nordland＠glass.cse.ogi.edu 16 Feb '01

16 Feb '01

nordland 2001/02/16 17:18:48 PST Modified files: lib/hugs HugsDynamic.hs Log: Fixed bug that caused a crash when showing the Type value of a list. Revision Changes Path 1.2 +3 -2 hugs98/lib/hugs/HugsDynamic.hs

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cvs commit: hugs98/src input.c
by Jeff Lewis 15 Feb '01

15 Feb '01

lewie 2001/02/15 08:06:59 PST Modified files: src input.c Log: Change open quote for HERE doc to ``, which is even less likely to accidently occur than ''. Revision Changes Path 1.24 +3 -3 hugs98/src/input.c

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cvs commit: hugs98 hugs98.spec
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 19:17:46 PST Modified files: . hugs98.spec Log: Made RPM aware of the new release notes and the Credits file. Revision Changes Path 1.9 +7 -1 hugs98/hugs98.spec

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cvs commit: hugs98 hugs98.spec
by Jeff Lewis 14 Feb '01

14 Feb '01

lewie 2001/02/14 15:09:09 PST Modified files: . hugs98.spec Log: Update Source field to match version. Revision Changes Path 1.8 +1 -1 hugs98/hugs98.spec

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cvs commit: hugs98 Credits hugs98/docs Credits
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 14:58:04 PST Added files: . Credits Removed files: docs Credits Log: Moved the Credits file to a more proper location, and added affiliations to the listed names.

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cvs commit: hugs98/src/winhugs winhugs.rc
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 14:55:20 PST Modified files: src/winhugs winhugs.rc Log: Replaced Pepe's name in the About box with a link to the Credits file. Revision Changes Path 1.5 +4 -2 hugs98/src/winhugs/winhugs.rc

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cvs commit: hugs98/src static.c
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 14:53:19 PST Modified files: src static.c Log: Fixed a slight omission in the code for checking Haskell style predicates. Revision Changes Path 1.31 +4 -3 hugs98/src/static.c

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cvs commit: hugs98/demos Eliza.hs
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 14:52:16 PST Modified files: demos Eliza.hs Log: Removed the type synonym 'Word', which has now become a predefined thing in the Prelude. Revision Changes Path 1.2 +2 -3 hugs98/demos/Eliza.hs

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cvs commit: hugs98/docs Credits machugs-notes.txt winhugs-notes.txt windows-notes.txt
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 05:20:27 PST Modified files: docs winhugs-notes.txt Added files: docs Credits machugs-notes.txt Removed files: docs windows-notes.txt Log: Updated release notes and added credits. Revision Changes Path 1.2 +3 -8 hugs98/docs/winhugs-notes.txt

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cvs commit: hugs98/src/machugs hugs.mcp.xml
by nordland＠glass.cse.ogi.edu 14 Feb '01

14 Feb '01

nordland 2001/02/14 04:33:40 PST Modified files: src/machugs hugs.mcp.xml Log: Made CWPro project file consistent. Revision Changes Path 1.2 +72 -264 hugs98/src/machugs/hugs.mcp.xml

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