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5273 :: Integrate NIM with C based project.

• Lachu (orginal) [2019-10-03T21:12:03+02:00] view original

  I tries to rewrite my project, called progress: call to power (game based on Freeciv) to nim, because I have memory problems (heap overlaps stack, so one function jump outside one's bound).

  I tries different approach. First was adding nim.cfg given bellow:

  cincludes:../c-files/common

  clibdir:../c-files/common

  app:lib

  output:./libcommon

  But it doesn't work.

  Next try was by write {.compiletime.} procedure. I use walkDir from us module with pattern *.c, but I cannot use compile with variable, because this variable doesn't been known at compile time (I called my function from normal code, so probably there's a problem - is there any way to call it at compile time?)

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• mratsim (orginal) [2019-10-03T21:33:32+02:00] view original

  (heap overlaps stack, so one function jump outside one's bound).

  That seems very improbably. It's more likely that you have a stack overflow and while writing a stack variable you also overwrite the return instructions of your function.

  Is your code open-source?

  If you compile your code with:

  • -d:useMalloc you will be able to use the classic C debugging techniques like Valgrind with Nim (otherwise Nim allocation pattern is opaque to Valgrind)
  • --debugger:native you will be able to use gdb/lldb with a reference to the Nim code you are currently stepping into, see also https://nim-lang.org/blog/2017/10/02/documenting-profiling-and-debugging-nim-code.html

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• Lachu (orginal) [2019-10-04T09:23:07+02:00] view original

  Re: up. Thanks for your response, but this doesn't solve my problem. Your told how to debug memory problems with nim app. You don't tell me how to connect C code with nim or how to solve memory problem in C code.

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• Lachu (orginal) [2019-10-04T12:37:17+02:00] view original

  Sorry I'm answering in two post. My game is opensource. Sources are accessible on sourceforge.net. Game is called progress call to power. There is one problem. I must check I upload newest sources. Not everything working, so I won't mess up in repository.

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• Lachu (orginal) [2019-10-04T16:15:58+02:00] view original

  I got first step forward. I will update this thread for any other nim/nimble beginners.

  What I doing wrong? First impression I must put different configuration of compiler with relating submodules to separate directories was good, but I don't known how to order nimble to build more modules. My mind just skip bin property in .nimble file was array. I added path to other modules relative to srcDir. Also I must repair syntax of nimble file. Missfortunately, path was os-dependent. I attach files here:

  1. $PROJECTDIR/postep.nimble

     Package

     version = "0.0.1" author = "Sławomir Lach" description = "Nimble version of postęp - game based on Freeciv" license = "GPL-2.0" srcDir = "src" installExt = @["nim"] bin = @["postep", "posteppkg/common/libcommon"]

     Dependencies

     requires "nim >= 1.0.0"

  2. App compiler config file ($PROJECTDIR/nim.cfg)

  --gc="refc"

  3. Library compiler config file ($PROJECTDIR/src/posteppkg/common/nim.cfg)

     --cincludes="../../c-files/common"

     --clibdir="../../c-files/common"

     --app="lib"

     --out="./libcommon"

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• Lachu (orginal) [2019-10-05T16:44:01+02:00] view original

  I just discovered NIM doesn't append a file extension to my library. -l linker argument gives linker name by omitting lib prefix and so extension. These are append automatically and linker will search lib names by matching it to result of mentioned operations.

  How to force nimc to generate file with .so extension?

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• Lachu (orginal) [2019-10-06T15:22:45+02:00] view original

  I build Progress: Call to Power with nimble. Currently only change is use some pragmas, change main function name in C files to something else and add code, that calls this function. I will wrote articles how to convert such projects. I only partially test. I must start rewriting some part of code to nim.

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