cvs commit: hugs98/libraries/Hugs ConcBase.hs Exception.hs IOExts.hs Prelude.hs System.hs hugs98/src array.c bignums.c builtin.c compiler.c connect.h hugs.c iomonad.c machine.c printer.c server.c type.c hugs98/src/unix convert_libraries

[ross@glass.cse.ogi.edu]

ross        2003/01/23 09:47:09 PST

  Modified files:
    libraries/Hugs       ConcBase.hs Exception.hs IOExts.hs 
                         Prelude.hs System.hs 
    src                  array.c bignums.c builtin.c compiler.c 
                         connect.h hugs.c iomonad.c machine.c 
                         printer.c server.c type.c 
    src/unix             convert_libraries 
  Log:
  Switch to the general Exception representation used in fptools/libraries.
  
  The old representation of exceptions was
  
          data Exception = IOException IOError | HugsException HugsException
  
  where IOErrors are passed to a failure continuation and printed using
  Show.  HugsExceptions are redexes that caused an error, triggering
  a longjmp.  If not caught, they get printed by the internal printer,
  e.g. {primDivInt 1 0}.  Now:
  
  * the Exception type is copied from Control.Exception, which sadly makes
    the Prelude a bit bigger; there are no HugsExceptions.
  
  * all Exceptions trigger a longjmp, are caught by runAndShowError
    and printed using Show, e.g. "divide by zero" -- less information,
    but more friendly.  As a result, +f (failOnError) now has no effect,
    although -u still works (slightly differently).
  
  * all of Control.Exception bar throw(Dyn)To works with Hugs.
  
  * the failure continuation in the IO type is unused, though it's still
    there for now.
  
  * now that exitWith throws an ExitException, an exitWith in a thread other
    than the main one is reported (like any other exception) but doesn't
    cause the program to terminate.  The other behaviour is possible,
    but this is what GHC does.
  
  Revision  Changes    Path
  1.10      +4 -6      hugs98/libraries/Hugs/ConcBase.hs
  1.6       +28 -59    hugs98/libraries/Hugs/Exception.hs
  1.8       +7 -31     hugs98/libraries/Hugs/IOExts.hs
  1.17      +147 -40   hugs98/libraries/Hugs/Prelude.hs
  1.7       +1 -12     hugs98/libraries/Hugs/System.hs
  1.6       +15 -10    hugs98/src/array.c
  1.7       +5 -5      hugs98/src/bignums.c
  1.43      +54 -55    hugs98/src/builtin.c
  1.13      +4 -4      hugs98/src/compiler.c
  1.60      +19 -2     hugs98/src/connect.h
  1.113     +8 -6      hugs98/src/hugs.c
  1.39      +3 -3      hugs98/src/iomonad.c
  1.13      +18 -16    hugs98/src/machine.c
  1.8       +34 -34    hugs98/src/printer.c
  1.27      +6 -2      hugs98/src/server.c
  1.62      +39 -12    hugs98/src/type.c
  1.49      +1 -2      hugs98/src/unix/convert_libraries