Trying out bytecode artefacts

[Saizan]

added test/golden/artefacts with a simple exe depending on lib project to try them out.

We set these flags to have bytecode libs and .gbc files.
-- cabal.project

packages: .
library-bytecode: True
package artefacts
  ghc-options: -fbyte-code-and-object-code -fwrite-byte-code -fwrite-interface 

[Saizan]

AFAICT both hdb and ghc --interactive

1. pick up on previously generated .gbc files and can work with breakpoints in those files.
2. refuse to set breakpoints in bytecode libraries because :break/break looks for modules in the HUG.

[1]

host:~/haskell-debugger/test/golden/artefacts$ cabal repl app/Main.hs
Resolving dependencies...
Build profile: -w ghc-10.1.20260617 -O1
In order, the following will be built (use -v for more details):
 - artefacts-0.1.0.0 (lib) (first run)
 - artefacts-0.1.0.0 (interactive) (exe:e) (first run)
Configuring library for artefacts-0.1.0.0...
Preprocessing library for artefacts-0.1.0.0...
Building library for artefacts-0.1.0.0...
[1 of 1] Compiling MyLib            ( lib/MyLib.hs, dist-newstyle/build/x86_64-linux/ghc-10.1.20260617/artefacts-0.1.0.0/build/MyLib.o, dist-newstyle/build/x86_64-linux/ghc-10.1.20260617/artefacts-0.1.0.0/build/MyLib.dyn_o, dist-newstyle/build/x86_64-linux/ghc-10.1.20260617/artefacts-0.1.0.0/build/MyLib.gbc )
Configuring executable 'e' for artefacts-0.1.0.0...
Preprocessing executable 'e' for artefacts-0.1.0.0...
GHCi, version 10.1.20260617: https://www.haskell.org/ghc/  :? for help
Using language edition: Haskell2010
[1 of 2] Compiling Main             ( app/Main.hs, dist-newstyle/build/x86_64-linux/ghc-10.1.20260617/artefacts-0.1.0.0/x/e/build/e/e-tmp/Main.gbc )[artefacts-0.1.0.0-inplace-e]
Ok, one module loaded.
ghci> 
Leaving GHCi.
host:~/haskell-debugger/test/golden/artefacts$ cabal repl app/Main.hs
Build profile: -w ghc-10.1.20260617 -O1
In order, the following will be built (use -v for more details):
 - artefacts-0.1.0.0 (interactive) (exe:e) (first run)
Preprocessing executable 'e' for artefacts-0.1.0.0...
GHCi, version 10.1.20260617: https://www.haskell.org/ghc/  :? for help
Using language edition: Haskell2010
Ok, one module loaded.
ghci> :break Main 8
Breakpoint 0 activated at app/Main.hs:8:3-7
ghci> main
Stopped in Main.main, app/Main.hs:8:3-7
_result :: IO () = _
x :: String = _
[app/Main.hs:8:3-7] ghci> 

[2]

ghci> :break lib/MyLib.hs 3
Cannot set breakpoint on ‘lib/MyLib.hs’: ‘lib/MyLib’ not in scope
ghci> :break MyLib 3
module 'MyLib' is from another package;
this command requires an interpreted module
ghci> 

[Saizan]

Panic with object-code + byte-code + break-points

$ ghci -iapp -ilib -fobject-code -fbyte-code-and-object-code -fbreak-points -outputdir=dump app/Main.hs
GHCi, version 10.1.20260617: https://www.haskell.org/ghc/ :? for help
Using default language edition: GHC2024
[1 of 3] Compiling MyLib ( lib/MyLib.hs, dump/MyLib.o, lib/MyLib.gbc )[main]
[2 of 3] Compiling Main ( app/Main.hs, dump/Main.o, app/Main.gbc )[main]
Ok, two modules loaded.
ghci> :break app/Main.hs 8
Cannot set breakpoint on ‘app/Main.hs’: ‘app/Main’ not in scope
ghci> :break Main 8
panic! (the 'impossible' happened)
GHC version 10.1.20260617:
getTickArray

Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug

ghci>