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  1. 12 Apr, 2011 3 commits
    • Simon Marlow's avatar
      Change the way module initialisation is done (#3252, #4417) · a52ff761
      Simon Marlow authored
      Previously the code generator generated small code fragments labelled
      with __stginit_M for each module M, and these performed whatever
      initialisation was necessary for that module and recursively invoked
      the initialisation functions for imported modules.  This appraoch had
      drawbacks:
      
       - FFI users had to call hs_add_root() to ensure the correct
         initialisation routines were called.  This is a non-standard,
         and ugly, API.
      
       - unless we were using -split-objs, the __stginit dependencies would
         entail linking the whole transitive closure of modules imported,
         whether they were actually used or not.  In an extreme case (#4387,
         #4417), a module from GHC might be imported for use in Template
         Haskell or an annotation, and that would force the whole of GHC to
         be needlessly linked into the final executable.
      
      So now instead we do our initialisation with C functions marked with
      __attribute__((constructor)), which are automatically invoked at
      program startup time (or DSO load-time).  The C initialisers are
      emitted into the stub.c file.  This means that every time we compile
      with -prof or -hpc, we now get a stub file, but thanks to #3687 that
      is now invisible to the user.
      
      There are some refactorings in the RTS (particularly for HPC) to
      handle the fact that initialisers now get run earlier than they did
      before.
      
      The __stginit symbols are still generated, and the hs_add_root()
      function still exists (but does nothing), for backwards compatibility.
      a52ff761
    • Simon Marlow's avatar
      Cleanup sweep and fix a bug in RTS flag processing. · 5463b55b
      Simon Marlow authored
      This code has accumulated a great deal of cruft over the years, this
      pass cleans up a lot of the surrounding cruft but leaves the actual
      argument processing alone - so there's still more that could be done.
      
      Bug fixed:
      
        - ghc_rts_opts should not be subject to the --rtsopts setting.  If
          the programmer explicitly declares options with ghc_rts_opts, they
          shouldn't also have to accept command-line RTS options to make them
          work.
      5463b55b
    • Simon Marlow's avatar
      isAlive: re-apply the tag if we find a forwarding pointer. This is a · 4f018b47
      Simon Marlow authored
      real bug, spotted by Marcin Orczyk (thanks!).  I'm not sure if it lead
      to any actual crashes.
      4f018b47
  2. 11 Apr, 2011 8 commits
  3. 09 Apr, 2011 4 commits
  4. 08 Apr, 2011 6 commits
    • Ian Lynagh's avatar
      rts/Linker.c tidyups and debug belches · 3783ffa6
      Ian Lynagh authored
      Part of the patch from #5062, from Greg Wright.
      3783ffa6
    • Ian Lynagh's avatar
      gen_contents_index: Improve parsing of packages file · 159fdb19
      Ian Lynagh authored
      We are now more lenient in parsing the packages file, and
      we don't use any GNUisms. Based on a patch from Matthias Kilian.
      159fdb19
    • kgardas's avatar
    • Simon Marlow's avatar
      Force re-linking if the options have changed (#4451) · 814edf44
      Simon Marlow authored
      A common sequence of commands (at least for me) is this:
      
      $ ghc hello
      1 of 1] Compiling Main             ( hello.hs, hello.o )
      Linking hello ...
      $ ./hello +RTS -s
      hello: Most RTS options are disabled. Link with -rtsopts to enable them.
      $ ghc hello -rtsopts
      $
      
      grr, nothing happened.  I could use -fforce-recomp, but if this was a
      large program I probably don't want to recompile it all again, so:
      
      $ rm hello
      removed `hello'
      $ ghc hello -rtsopts
      Linking hello ...
      $ ./hello +RTS -s
      ./hello +RTS -s
      Hello World!
                51,264 bytes allocated in the heap
                 2,904 bytes copied during GC
                43,808 bytes maximum residency (1 sample(s))
                17,632 bytes maximum slop
      etc.
      
      With this patch, GHC notices when the options have changed and forces
      a relink, so you don't need to rm the binary or use -fforce-recomp.
      This is done by adding the pertinent stuff to the binary in a special
      section called ".debug-ghc-link-info":
      
      $ readelf -p .debug-ghc-link-info ./hello
      String dump of section 'ghc-linker-opts':
        [     0]  (["-lHSbase-4.3.1.0","-lHSinteger-gmp-0.2.0.2","-lgmp","-lHSghc-prim-0.2.0.0","-lHSrts","-lm","-lrt","-ldl","-u","ghczmprim_GHCziTypes_Izh_static_info","-u","ghczmprim_GHCziTypes_Czh_static_info","-u","ghczmprim_GHCziTypes_Fzh_static_info","-u","ghczmprim_GHCziTypes_Dzh_static_info","-u","base_GHCziPtr_Ptr_static_info","-u","base_GHCziWord_Wzh_static_info","-u","base_GHCziInt_I8zh_static_info","-u","base_GHCziInt_I16zh_static_info","-u","base_GHCziInt_I32zh_static_info","-u","base_GHCziInt_I64zh_static_info","-u","base_GHCziWord_W8zh_static_info","-u","base_GHCziWord_W16zh_static_info","-u","base_GHCziWord_W32zh_static_info","-u","base_GHCziWord_W64zh_static_info","-u","base_GHCziStable_StablePtr_static_info","-u","ghczmprim_GHCziTypes_Izh_con_info","-u","ghczmprim_GHCziTypes_Czh_con_info","-u","ghczmprim_GHCziTypes_Fzh_con_info","-u","ghczmprim_GHCziTypes_Dzh_con_info","-u","base_GHCziPtr_Ptr_con_info","-u","base_GHCziPtr_FunPtr_con_info","-u","base_GHCziStable_StablePtr_con_info","-u","ghczmprim_GHCziTypes_False_closure","-u","ghczmprim_GHCziTypes_True_closure","-u","base_GHCziPack_unpackCString_closure","-u","base_GHCziIOziException_stackOverflow_closure","-u","base_GHCziIOziException_heapOverflow_closure","-u","base_ControlziExceptionziBase_nonTermination_closure","-u","base_GHCziIOziException_blockedIndefinitelyOnMVar_closure","-u","base_GHCziIOziException_blockedIndefinitelyOnSTM_closure","-u","base_ControlziExceptionziBase_nestedAtomically_closure","-u","base_GHCziWeak_runFinalizzerBatch_closure","-u","base_GHCziTopHandler_runIO_closure","-u","base_GHCziTopHandler_runNonIO_closure","-u","base_GHCziConcziIO_ensureIOManagerIsRunning_closure","-u","base_GHCziConcziSync_runSparks_closure","-u","base_GHCziConcziSignal_runHandlers_closure","-lHSffi"],Nothing,RtsOptsAll,False,[],[])
      
      And GHC itself uses the readelf command to extract it when deciding
      whether to relink.  The reason for the name ".debug-ghc-link-info" is
      that sections beginning with ".debug" are removed automatically by
      strip.
      
      This currently only works on Linux; Windows and OS X still have the
      old behaviour.
      814edf44
    • Ian Lynagh's avatar
      Handle '\r's in boot-pkgs files · e0d60d50
      Ian Lynagh authored
      By default, git will clone in autocrlf mode, which on Windows means
      we get '\r's added to the ghc-packages files.
      e0d60d50
    • Simon Marlow's avatar
      bugfix for stub generation: create the directory for the _stub.h file, · 9ffa2686
      Simon Marlow authored
      not the _stub.c file, because the latter is now created as a temporary
      file.
      9ffa2686
  5. 07 Apr, 2011 2 commits
  6. 06 Apr, 2011 14 commits
  7. 05 Apr, 2011 3 commits