pmcheck/T11195
Harbourmaster is failing (“Killed”) on pmcheck/should_compile/T11195. Are others finding this? What should we do? SImon ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
RE: Determining if an instance is provided by the environment
You probably want a variant on TcDeriv.simplifyDeriv, shorn of its complex error reporting. Simon | -Original Message- | From: ghc-devs [mailto:ghc-devs-boun...@haskell.org] On Behalf Of | Edward Z. Yang | Sent: 06 May 2016 00:21 | To: ghc-devs | Subject: Determining if an instance is provided by the environment | | Hello all, | | Suppose I have a ClsInst from typechecking the following instance | declaration: | | instance Show [Char] -- i.e. String | | I'd now like to answer the question: "Is this instance 'provided' | by the instance environment?" For example, this instance is provided | given that I have these two instances in the environment: | | instance Show a => Show [a] -- (1) | instance Show Char -- (2) | | However, if I have just instance (1) in the environment, it's not | provided (and if you tried to use show "foo", you'd get the error that | Char is not an instance of Show.) | | Is there are convenient way to do this from TcM? With 'tcMatchTys' | and I can easily test if there is some instance in the environment | which *matches* my instance head (e.g., Show [a] matches Show [Char]) | but this doesn't tell me if all the resulting constraints are solvable. | | Thanks, | Edward | ___ | ghc-devs mailing list | ghc-devs@haskell.org | https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.ha | skell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc- | devs&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7c8c304d9b355244c6 | ee7208d3753be740%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=iWdrnb6hC | 8pexyVkWNG22G%2fgdO10tCBy8nuCxhnO0M8%3d ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
Re: Mentor for a JVM backend for GHC
Hi Rahul, Exicting to see other folks interested into doing this! I did started an exprimental project on this at the end of last year, sadly I did not had much time to work on it and it was closed sources, I just opened it, so maybe we can share/reuse stuff? Please take a look at this repository: https://github.com/aloiscochard/kuna The most useful part is probaly the java assembly, I was not so happy of hs-java so I rewrote an assembler from scratch. To be honest I have not yet looked in your code, but I'll definitely will. Let's keep in touch! Cheers On 2 May 2016 at 17:26, Rahul Muttineni wrote: > Hi GHC Developers, > > I've started working on a JVM backend for GHC [1] and I'd love to work on > it as my Summer of Haskell project. > > Currently, the build system is setup using a mix of Shake (for the RTS > build) and Stack (for the main compiler build) and I ensure that most > commits build successfully. I have ported the core part of the scheduler > and ported over the fundamental types (Capability, StgTSO, Task, > StgClosure, etc.) taking advantage of OOP in the implementation when I > could. > > Additionally, I performed a non-trivial refactor of the hs-java package > adding support for inner classes and fields which was very cumbersome to do > in the original package. On the frontend, I have tapped into the STG code > from the GHC 7.10.3 library and setup a CodeGen monad for generating JVM > bytecode. The main task of generating the actual bytecode, porting the more > critical parts of the RTS, and adding support for the threaded RTS remain. > > The strategy for compilation is as follows: > - Intercept the STG code in the GHC pipeline > - Convert from STG->JVM bytecode [2] in a similar manner as STG->Cmm > preserving semantics as best as possible [3] > - Port the GHC RTS (normal & threaded) to Java [4] > - Put all the generated class files + RTS into a single jar to be run > directly by the JVM. > > My objectives for the project during the summer are: > - To implement the compilation strategy mentioned above > - Implement the Java FFI for foreign imports. [5] > - Implement the most important [6] PrimOps that GHC supports. > - Port the base package replacing the C FFI imports with equivalent Java > FFI imports. [7] > > A little bit about myself: I spent a lot of time studying functional > language implementation by reading SPJ's famous book and reading research > papers on related topics last summer as self-study. > > I took a break and resumed a couple months ago where I spent a lot of time > plowing through the STG->Cmm code generator as well as the RTS and going > back and forth between them to get a clear understanding of how everything > works. > > Moreover, I compiled simple Haskell programs and observed the STG, Cmm, > and assembly output (by decompiling the final executable with objdump) to > understand bits of the code generator where the source code wasn't that > clear. > > I also spent a great deal of time studying the JVM internals, reading the > JVM spec, looking for any new features that could facilitate a high > performance implementation [8]. > > It would be great if someone with an understanding of nuances of the RTS > and code generator could mentor me for this project. It has been a blast so > far learning all the prerequisites and contemplating the design. I'd be > very excited to take this on as a summer project. > > Also, given that I have hardly 5 days remaining, does anyone have > suggestions on how I can structure the proposal without getting into too > many details? There are still some parts of the design I haven't figured > out, but I know I could find some solution when I get to it during the > porting process. > > Thanks, > Rahul Muttineni > > [1] http://github.com/rahulmutt/ghcvm > > [2] I intend to organically derive an IR at a later stage to allow for > some optimizations by looking at the final working implementation without > an IR and looking for patterns of repeated sequences of bytecode and > assigning each sequence its own instruction in the IR. > > [3] Obviously, the lack of control of memory layouts (besides allocating > off the JVM heap using DirectByteBuffers) and lack of general tail calls > makes it tough to match the semantics of Cmm, but there are many solutions > around it, as can be found in the few papers on translating STG to Java/JVM > bytecode. > > [4] This is the GHC RTS without GC and profiling since the JVM has great > support for those already. Also, lots of care must be taken to ensure that > the lock semantics stays in tact during the port. > > [5] foreign exports will be dealt at a later stage, but I am taking care > of naming the closures nicely so that in the future you don't have to type > long names like the labels GHC compiles to call a Haskell function in Java. > > [6] Basically all the PrimOps that would be required to provide plumbing > for the Prelude functions that can compile beginner-level programs found in > books such
Re: [Maintainer needed] Actively maintained Haddock are happy Haddock
Sebastian writes: > Hello Ben, > Hi Sebastian, Sorry for the belated response. > If that's ok I'd be happy to take over the maintenance of Haddock. > Sure, that would be great. I can give you the keys in a bit. Cheers, - Ben signature.asc Description: PGP signature ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
RE: Determining if an instance is provided by the environment
Thanks Simon, that has all the ingredients I need. I wrote some more docs for the function: https://phabricator.haskell.org/D2180 Edward Excerpts from Simon Peyton Jones's message of 2016-05-06 02:05:31 -0700: > You probably want a variant on TcDeriv.simplifyDeriv, shorn of its complex > error reporting. > > Simon > > | -Original Message- > | From: ghc-devs [mailto:ghc-devs-boun...@haskell.org] On Behalf Of > | Edward Z. Yang > | Sent: 06 May 2016 00:21 > | To: ghc-devs > | Subject: Determining if an instance is provided by the environment > | > | Hello all, > | > | Suppose I have a ClsInst from typechecking the following instance > | declaration: > | > | instance Show [Char] -- i.e. String > | > | I'd now like to answer the question: "Is this instance 'provided' > | by the instance environment?" For example, this instance is provided > | given that I have these two instances in the environment: > | > | instance Show a => Show [a] -- (1) > | instance Show Char -- (2) > | > | However, if I have just instance (1) in the environment, it's not > | provided (and if you tried to use show "foo", you'd get the error that > | Char is not an instance of Show.) > | > | Is there are convenient way to do this from TcM? With 'tcMatchTys' > | and I can easily test if there is some instance in the environment > | which *matches* my instance head (e.g., Show [a] matches Show [Char]) > | but this doesn't tell me if all the resulting constraints are solvable. > | > | Thanks, > | Edward > | ___ > | ghc-devs mailing list > | ghc-devs@haskell.org > | https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.ha > | skell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc- > | devs&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com%7c8c304d9b355244c6 > | ee7208d3753be740%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=iWdrnb6hC > | 8pexyVkWNG22G%2fgdO10tCBy8nuCxhnO0M8%3d ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
Re: Determining if an instance is provided by the environment
Is there a way to connect this to template-haskell or haskell-src-exts code? On Fri, May 6, 2016 at 4:40 PM, Edward Z. Yang wrote: > Thanks Simon, that has all the ingredients I need. > > I wrote some more docs for the function: > https://phabricator.haskell.org/D2180 > > Edward > > Excerpts from Simon Peyton Jones's message of 2016-05-06 02:05:31 -0700: > > You probably want a variant on TcDeriv.simplifyDeriv, shorn of its > complex error reporting. > > > > Simon > > > > | -Original Message- > > | From: ghc-devs [mailto:ghc-devs-boun...@haskell.org] On Behalf Of > > | Edward Z. Yang > > | Sent: 06 May 2016 00:21 > > | To: ghc-devs > > | Subject: Determining if an instance is provided by the environment > > | > > | Hello all, > > | > > | Suppose I have a ClsInst from typechecking the following instance > > | declaration: > > | > > | instance Show [Char] -- i.e. String > > | > > | I'd now like to answer the question: "Is this instance 'provided' > > | by the instance environment?" For example, this instance is provided > > | given that I have these two instances in the environment: > > | > > | instance Show a => Show [a] -- (1) > > | instance Show Char -- (2) > > | > > | However, if I have just instance (1) in the environment, it's not > > | provided (and if you tried to use show "foo", you'd get the error that > > | Char is not an instance of Show.) > > | > > | Is there are convenient way to do this from TcM? With 'tcMatchTys' > > | and I can easily test if there is some instance in the environment > > | which *matches* my instance head (e.g., Show [a] matches Show [Char]) > > | but this doesn't tell me if all the resulting constraints are > solvable. > > | > > | Thanks, > > | Edward > > | ___ > > | ghc-devs mailing list > > | ghc-devs@haskell.org > > | > https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.ha > > | skell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc- > > | devs&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com > %7c8c304d9b355244c6 > > | > ee7208d3753be740%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=iWdrnb6hC > > | 8pexyVkWNG22G%2fgdO10tCBy8nuCxhnO0M8%3d > ___ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
Re: Determining if an instance is provided by the environment
Well, I have to write the new variant of this function :) Simon, I ran into a minor complication: if my instance is something like: instance Show a => Show [a] I think I need to pass in a 'CtGiven' for 'Show a'. However, I don't know what to pass as the evidence to the 'CtGiven' constraints. My guess is that it doesn't matter? Edward Excerpts from David Fox's message of 2016-05-06 17:06:41 -0700: > Is there a way to connect this to template-haskell or haskell-src-exts code? > > On Fri, May 6, 2016 at 4:40 PM, Edward Z. Yang wrote: > > > Thanks Simon, that has all the ingredients I need. > > > > I wrote some more docs for the function: > > https://phabricator.haskell.org/D2180 > > > > Edward > > > > Excerpts from Simon Peyton Jones's message of 2016-05-06 02:05:31 -0700: > > > You probably want a variant on TcDeriv.simplifyDeriv, shorn of its > > complex error reporting. > > > > > > Simon > > > > > > | -Original Message- > > > | From: ghc-devs [mailto:ghc-devs-boun...@haskell.org] On Behalf Of > > > | Edward Z. Yang > > > | Sent: 06 May 2016 00:21 > > > | To: ghc-devs > > > | Subject: Determining if an instance is provided by the environment > > > | > > > | Hello all, > > > | > > > | Suppose I have a ClsInst from typechecking the following instance > > > | declaration: > > > | > > > | instance Show [Char] -- i.e. String > > > | > > > | I'd now like to answer the question: "Is this instance 'provided' > > > | by the instance environment?" For example, this instance is provided > > > | given that I have these two instances in the environment: > > > | > > > | instance Show a => Show [a] -- (1) > > > | instance Show Char -- (2) > > > | > > > | However, if I have just instance (1) in the environment, it's not > > > | provided (and if you tried to use show "foo", you'd get the error that > > > | Char is not an instance of Show.) > > > | > > > | Is there are convenient way to do this from TcM? With 'tcMatchTys' > > > | and I can easily test if there is some instance in the environment > > > | which *matches* my instance head (e.g., Show [a] matches Show [Char]) > > > | but this doesn't tell me if all the resulting constraints are > > solvable. > > > | > > > | Thanks, > > > | Edward > > > | ___ > > > | ghc-devs mailing list > > > | ghc-devs@haskell.org > > > | > > https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fmail.ha > > > | skell.org%2fcgi-bin%2fmailman%2flistinfo%2fghc- > > > | devs&data=01%7c01%7csimonpj%40064d.mgd.microsoft.com > > %7c8c304d9b355244c6 > > > | > > ee7208d3753be740%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=iWdrnb6hC > > > | 8pexyVkWNG22G%2fgdO10tCBy8nuCxhnO0M8%3d > > ___ > > ghc-devs mailing list > > ghc-devs@haskell.org > > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > ___ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs