[GHC] #1: Implicit parameters cause strange behavi

[GHC]

#1: Implicit parameters cause strange behavi
--------------------------------+--------------------
       Reporter:  nobody        |      Owner:  nobody
           Type:  bug           |     Status:  closed
       Priority:  normal        |  Milestone:
      Component:  Compiler      |    Version:  5.0
     Resolution:  Fixed         |   Keywords:
Type of failure:  None/Unknown  |
--------------------------------+--------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"104599f3f157613589e78627c915e4dc20ee54b4/ghc" 104599f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="104599f3f157613589e78627c915e4dc20ee54b4"
 Add a RTS option -xp to load PIC object anywhere in address space

 Add a RTS option -xp to load PIC object anywhere in address space. We do
 this by relaxing the requirement of <0x80000000 result of
 `mmapForLinker` and implying USE_CONTIGUOUS_MMAP.

 We also need to change calls to `ocInit` and `ocGetNames` to avoid
 dangling pointers when the address of `oc->image` is changed by
 `ocAllocateSymbolExtra`.

 Test Plan:
 ```
 $ uname -a
 Linux localhost 4.18.8-arch1-1-ARCH #1 SMP PREEMPT Sat Sep 15 20:34:48
 UTC 2018 x86_64 GNU/Linux
 $ cat mk/build.mk
 DYNAMIC_GHC_PROGRAMS = NO
 DYNAMIC_BY_DEFAULT = NO

 GhcRTSWays += thr_debug
 EXTRA_HC_OPTS += -debug
 WAY_p_HC_OPTS += -fPIC -fexternal-dynamic-refs
 $ inplace/bin/ghc-stage2 --interactive -prof +RTS -xp
 GHCi, version 8.7.20180928: http://www.haskell.org/ghc/  :? for help
 ghc-stage2: R_X86_64_32 relocation out of range:
 ghczmprim_GHCziTypes_ZMZN_closure = 7f690bffab59
 Recompile
 /data/users/watashi/ghc/libraries/ghc-prim/dist-install/build/HSghc-prim
 -0.5.3.o with -fPIC -fexternal-dynamic-refs.
 ghc-stage2: unable to load package `ghc-prim-0.5.3'
 $ strace -f -e open,mmap inplace/bin/ghc-stage2 --interactive -prof
 -fexternal-interpreter  -opti+RTS -opti-xp
 ...
 [pid 1355283]
 open("/data/users/watashi/ghc/libraries/base/dist-install/build/libHSbas
 e-4.12.0.0_p.a", O_RDONLY) = 14
 [pid 1355283] mmap(NULL, 8192, PROT_READ|PROT_WRITE|PROT_EXEC,
 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a84842000
 [pid 1355283]
 open("/data/users/watashi/ghc/libraries/base/dist-install/build/libHSbas
 e-4.12.0.0_p.a", O_RDONLY) = 14
 [pid 1355283] mmap(NULL, 8192, PROT_READ|PROT_WRITE|PROT_EXEC,
 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a84676000
 ...
 Prelude> System.Posix.Process.getProcessID
 ...
 [pid 1355283]
 open("/data/users/watashi/ghc/libraries/unix/dist-install/build/libHSuni
 x-2.7.2.2_p.a", O_RDONLY) = 14
 [pid 1355283] mmap(NULL, 45056, PROT_READ|PROT_WRITE|PROT_EXEC,
 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a67d60000
 [pid 1355283]
 open("/data/users/watashi/ghc/libraries/unix/dist-install/build/libHSuni
 x-2.7.2.2_p.a", O_RDONLY) = 14
 [pid 1355283] mmap(NULL, 57344, PROT_READ|PROT_WRITE|PROT_EXEC,
 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6a67d52000
 ...
 ```

 ```
 $ uname -a
 Darwin watashis-iMac.local 18.0.0 Darwin Kernel Version 18.0.0: Wed Aug
 22 20:13:40 PDT 2018; root:xnu-4903.201.2~1/RELEASE_X86_64 x86_64
 $ mv
 /Users/watashi/gao/ghc/libraries/integer-gmp/dist-install/build/HSintege
 r-gmp-1.0.2.0.o{,._DISABLE_GHC_ISSUE_15105}
 $ inplace/bin/ghc-stage2 --interactive  +RTS -xp
 GHCi, version 8.7.20181003: http://www.haskell.org/ghc/  :? for help
 Prelude> System.Posix.Process.getProcessID
 42791
 Prelude> Data.Set.fromList [1 .. 10]
 fromList [1,2,3,4,5,6,7,8,9,10]
 Prelude>
 Leaving GHCi.
 $ inplace/bin/ghc-stage2 --interactive -prof -fexternal-interpreter
 GHCi, version 8.7.20181003: http://www.haskell.org/ghc/  :? for help
 Prelude> System.Posix.Process.getProcessID
 42806
 Prelude> Data.Set.fromList [1 .. 10]
 fromList [1,2,3,4,5,6,7,8,9,10]
 Prelude>
 Leaving GHCi.
 ```

 Also test with something that used to hit the 2Gb limit and it loads
 and runs without problem.

 Reviewers: simonmar, bgamari, angerman, Phyx, hvr, erikd

 Reviewed By: simonmar

 Subscribers: rwbarton, carter

 Differential Revision: https://phabricator.haskell.org/D5195
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1#comment:7>
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