August 2015 - ghc-tickets

Re: [GHC] #1687: A faster (^)-function.
by GHC 12 Aug '15

12 Aug '15

#1687: A faster (^)-function. -------------------------------------+------------------------------------- Reporter: moonlite@… | Owner: Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Prelude | Version: 6.6.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86 Type of failure: Runtime | Test Case: performance bug | Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by bgamari): * cc: hvr (added) Comment: hvr, what do you think about this? Perhaps integer_gmp could wrap `mpz_pow_ui`? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1687#comment:16> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #624: Program location for thread error messages
by GHC 12 Aug '15

12 Aug '15

#624: Program location for thread error messages -------------------------------------+------------------------------------- Reporter: chak | Owner: Type: task | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: None Resolution: None | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by gridaphobe): * cc: gridaphobe (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/624#comment:11> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #624: Program location for thread error messages
by GHC 12 Aug '15

12 Aug '15

#624: Program location for thread error messages -------------------------------------+------------------------------------- Reporter: chak | Owner: Type: task | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: None Resolution: None | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: ⊥ => 7.12.1 Comment: It seems like we have the pieces in place to address this in 7.12. Milestoning appropriately There are a few questions that remain, however, * What sort of stack trace should the exception carry? At the moment we have a number of source location representations scattered about `base` (which will hopefully soon be cleaned up; see #10068) * Do we want backtraces to be enabled by default? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/624#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #3712: Implement -dynamic-lib option
by GHC 12 Aug '15

12 Aug '15

#3712: Implement -dynamic-lib option -------------------------------------+------------------------------------- Reporter: simonmar | Owner: Type: task | Status: new Priority: low | Milestone: 7.12.1 Component: Compiler | Version: 6.12.1 RC1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by bgamari): Simon, do you intend on picking this up? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3712#comment:9> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #3704: Using -shared without -dynamic should be rejected on linux
by GHC 12 Aug '15

12 Aug '15

#3704: Using -shared without -dynamic should be rejected on linux -------------------------------------+------------------------------------- Reporter: asuffield | Owner: Type: bug | Status: closed Priority: low | Milestone: 7.12.1 Component: Compiler | Version: Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by bgamari): Actually it appears that it is not yet available (see #3712) but there isn't really a clear course of action on this bug otherwise so I'm going to leave this closed. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3704#comment:15> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #3704: Using -shared without -dynamic should be rejected on linux
by GHC 12 Aug '15

12 Aug '15

#3704: Using -shared without -dynamic should be rejected on linux -------------------------------------+------------------------------------- Reporter: asuffield | Owner: Type: bug | Status: closed Priority: low | Milestone: 7.12.1 Component: Compiler | Version: Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => fixed Comment: I am going to close this as it appears that `-dynamic-lib` is now available. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3704#comment:14> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9143: feature request: way to set actual program argv
by GHC 12 Aug '15

12 Aug '15

#9143: feature request: way to set actual program argv ----------------------------------------------+---------------------------- Reporter: joeyhess | Owner: Type: feature request | simonmar Priority: normal | Status: new Component: Runtime System | Milestone: Keywords: | Version: 7.8.2 Architecture: Unknown/Multiple | Operating System: Linux Difficulty: Moderate (less than a day) | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: ----------------------------------------------+---------------------------- It's not currently possible to write a program with ghc that changes its argv, so as to change what the program name/parameters appear to be in ps. An example of a program that does this is sshd, which arranges for the process name to say which user it's serving. For example, "sshd: joey [priv]" I'd like to be able to write such programs using haskell too. Also, I have a haskell program that, due to the way it is executed, has a really horrible display in ps: /usr/local/propellor/docker/android-git-annex- builder.orca.kitenet.net.propellor.shim/lib64/ld-linux-x86-64.so.2 --library-path /usr/local/propellor/docker/android-git-annex- builder.orca.kitenet.net.propellor.shim/lib/x86_64-linux- gnu:/usr/local/propellor/docker/android-git-annex- builder.orca.kitenet.net.propellor.shim/usr/lib/x86_64-linux- gnu:/usr/local/propellor/docker/android-git-annex- builder.orca.kitenet.net.propellor.shim/lib64:/usr/local/propellor/docker /android-git-annex- builder.orca.kitenet.net.propellor.shim/etc/ld.so.conf.d:/usr/local/propellor/docker /android-git-annex-builder.orca.kitenet.net.propellor.shim/usr/lib/x86_64 -linux-gnu/audit:/usr/local/propellor/docker/android-git-annex- builder.orca.kitenet.net.propellor.shim/usr/lib/x86_64-linux-gnu/gconv /usr/local/propellor/propellor That's enough motivation for me to dig into this. :) In rts/RtsMain.c, progargv is set to point to argv. However, it's static, so this cannot be (ab)used from the FFI to change argv. So, a minimal change would be to make progargv not be static, and perhaps give it a more formal name or minimal FFI binding. A GHC-specific library could then use this to modify argv. The haskell interface I'm considering would be: displayArgv :: [String] -> IO () It would need to truncate strings to fit within the available argv space. (This would not affect the argv used by System.Environment, which is a copy of argv.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9143> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #597: Various error messages have inaccurate source locations
by GHC 12 Aug '15

12 Aug '15

#597: Various error messages have inaccurate source locations -------------------------------------+------------------------------------- Reporter: simonmar | Owner: Type: task | Status: closed Priority: low | Milestone: ⊥ Component: Compiler | Version: None Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: #10768 | Differential Revisions: -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: None => fixed * related: => #10768 Comment: Closing as all but one of these issues have been resolved. The remaining issue will be tracked by #10768. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/597#comment:11> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #2393: Text.PrettyPrint.HughesPJ: Bug fixes, performance improvement
by GHC 12 Aug '15

12 Aug '15

#2393: Text.PrettyPrint.HughesPJ: Bug fixes, performance improvement -------------------------------------+--------------------------------- Reporter: guest | Owner: Type: bug | Status: closed Priority: normal | Milestone: 6.10.1 Component: libraries/pretty | Version: 6.8.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Test Case: | -------------------------------------+--------------------------------- Comment (by Thomas Miedema <thomasmiedema@…>): In [changeset:"f903949beee3a4e0a925003b5553066c9f513c11/ghc" f903949/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="f903949beee3a4e0a925003b5553066c9f513c11" Pretty: improving the space/time performance of vcat, hsep, hcat (#10735) After 5d57087e314bd484dbe14958f9b422be3ac6641a ("Pretty: fix a broken invariant"), T3294 showed 50% more max_bytes_used (#3294). After this commit, max_bytes_used is back to what it was before, and the test passes again. This is a backport of a bug fix by Benedikt Huber (#2393), from commit 1e50748beaa4bd2281d323b18ea51c786bba04a1 in the pretty library. From https://mail.haskell.org/pipermail/libraries/2008-June/009991.html: vcat (hsep,cat) is implemented in an unneccessarily strict way. We only get some output after all of vcat's arguments are evaluated and checked against being Empty. This can be improved by only checking the right argument of foldr against being Empty, and then applying an Empty-filter on the resulting Doc. Space improvement is obvious. The microbenchmark (code.haskell.org/~bhuber/Text/PrettyPrint/ HughesPJPerfCheck.hs) suggests that the improvements in time are remarkable too. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2393#comment:9> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #3294: Large compilation time/memory consumption
by GHC 12 Aug '15

12 Aug '15

#3294: Large compilation time/memory consumption -------------------------------------------------+------------------------- Reporter: pumpkin | Owner: simonmar Type: bug | Status: closed Priority: low | Milestone: 7.4.1 Component: Compiler | Version: 6.10.3 Resolution: wontfix | Keywords: Operating System: MacOS X | Architecture: x86 Type of failure: Compile-time performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | -------------------------------------------------+------------------------- Comment (by Thomas Miedema <thomasmiedema@…>): In [changeset:"f903949beee3a4e0a925003b5553066c9f513c11/ghc" f903949/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="f903949beee3a4e0a925003b5553066c9f513c11" Pretty: improving the space/time performance of vcat, hsep, hcat (#10735) After 5d57087e314bd484dbe14958f9b422be3ac6641a ("Pretty: fix a broken invariant"), T3294 showed 50% more max_bytes_used (#3294). After this commit, max_bytes_used is back to what it was before, and the test passes again. This is a backport of a bug fix by Benedikt Huber (#2393), from commit 1e50748beaa4bd2281d323b18ea51c786bba04a1 in the pretty library. From https://mail.haskell.org/pipermail/libraries/2008-June/009991.html: vcat (hsep,cat) is implemented in an unneccessarily strict way. We only get some output after all of vcat's arguments are evaluated and checked against being Empty. This can be improved by only checking the right argument of foldr against being Empty, and then applying an Empty-filter on the resulting Doc. Space improvement is obvious. The microbenchmark (code.haskell.org/~bhuber/Text/PrettyPrint/ HughesPJPerfCheck.hs) suggests that the improvements in time are remarkable too. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3294#comment:14> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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