haskell – 在GHCi下动态加载

我需要能够动态地加载Haskell模块,并在动态加载模块的上下文中评估表达式。

Hint这样做问题是,它至少在Windows下不能在GHCi下运行。

cygwin-bash> ghci HintTest.hs
GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Ok, modules loaded: Main.
Prelude Main>
Prelude Main> main
[... lots of "Loading package" messages snipped]

GHCi runtime linker: fatal error: I found a duplicate definition for symbol
   _debugLn
whilst processing object file
   C:\PROGRAM FILES (X86)\HASKELL PLATFORM\2013.2.0.0\lib\ghc-prim-0.3.0.0\HSghc-prim-0.3.0.0.o
This could be caused by:
   * Loading two different object files which export the same symbol
   * Specifying the same object file twice on the GHCi command line
   * An incorrect `package.conf' entry, causing some object to be
     loaded twice.
GHCi cannot safely continue in this situation.  Exiting now.  Sorry.

直接使用GHC模块时也会出现相同的错误,如GHC/As a library所示。

作为一个编译程序,HintTest运行正常。

有没有什么可以做到这一点?

我不需要独立运行我的程序;总是使用GHCi就足够了。如果程序可以使用GHCi本身作为解释器,而不是GHCi自己的GHC副本也是很好的。也就是说,我想要这样做:

do
  context <- loadToGhci "MyModule.hs"
  inContext context "MyModule.myFunction 2 5"

当我返回到REPL时,MyModule被神奇地加载到它。上下文意在是某种携带GHCi状态的monad。

更新相同的代码在Linux上工作。也许这是GHC中Windows特定的错误。可以解决吗?

更新2
这是完整的日志

Prelude Main> main
Loading package array-0.4.0.1 ... linking ... done.
Loading package deepseq-1.3.0.1 ... linking ... done.
Loading package bytestring-0.10.0.2 ... linking ... done.
Loading package Win32-2.3.0.0 ... linking ... done.
Loading package transformers-0.3.0.0 ... linking ... done.
Loading package old-locale-1.0.0.5 ... linking ... done.
Loading package time-1.4.0.1 ... linking ... done.
Loading package syb-0.4.0 ... linking ... done.
Loading package random-1.0.1.1 ... linking ... done.
Loading package filepath-1.3.0.1 ... linking ... done.
Loading package directory-1.2.0.1 ... linking ... done.
Loading package process-1.1.0.2 ... linking ... done.
Loading package pretty-1.1.1.0 ... linking ... done.
Loading package mtl-2.1.2 ... linking ... done.
Loading package containers-0.5.0.0 ... linking ... done.
Loading package hpc-0.6.0.0 ... linking ... done.
Loading package hoopl-3.9.0.0 ... linking ... done.
Loading package haskell-src-1.0.1.5 ... linking ... done.
Loading package old-time-1.1.0.1 ... linking ... done.
Loading package Cabal-1.16.0 ... linking ... done.
Loading package binary-0.5.1.1 ... linking ... done.
Loading package bin-package-db-0.0.0.0 ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package ghc-7.6.3 ... linking ... done.
Loading package extensible-exceptions-0.1.1.4 ... linking ... done.
Loading package MonadCatchIO-mtl-0.3.0.5 ... linking ... done.
Loading package ghc-mtl-1.0.1.2 ... linking ... done.
Loading package ghc-paths-0.1.0.9 ... linking ... done.
Loading package utf8-string-0.3.7 ... linking ... done.
Loading package hint-0.3.3.7 ... linking ... done.


GHCi runtime linker: fatal error: I found a duplicate definition for symbol
   _debugLn
whilst processing object file
   C:\PROGRAM FILES (X86)\HASKELL PLATFORM\2013.2.0.0\lib\ghc-prim-0.3.0.0\HSghc-prim-0.3.0.0.o
This could be caused by:
   * Loading two different object files which export the same symbol
   * Specifying the same object file twice on the GHCi command line
   * An incorrect `package.conf' entry, causing some object to be
     loaded twice.
GHCi cannot safely continue in this situation.  Exiting now.  Sorry.
您正在尝试将字节码解释器和运行时动态加载到字节码解释器和运行时。这是否取决于底层C库在系统上的链接方式 – 这取决于平台的依赖。

特别是,当您第二次加载各种RTS模块时,除非特别注意链接,否则C符号将被复制,这将导致链接器错误。

http://stackoverflow.com/questions/20395127/dynamic-loading-under-ghci

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